TREATING CRT NON-RESPONDERS USING CARDIAC CONTRACTILITY MODULATION THERAPY
20230264030 · 2023-08-24
Assignee
Inventors
Cpc classification
A61N1/3686
HUMAN NECESSITIES
A61N1/3688
HUMAN NECESSITIES
G16H20/40
PHYSICS
A61N1/40
HUMAN NECESSITIES
A61N1/3622
HUMAN NECESSITIES
International classification
A61N1/40
HUMAN NECESSITIES
Abstract
A method of selecting a patient for cardiac contractility modulation therapy, comprising: selecting a patient meeting a criteria for cardiac resynchronization therapy (CRT); detecting a potential difficulty in effective delivery of CRT to the patient; and determining that the patient can benefit from cardiac contractility modulation therapy in spite of said potential difficulty.
Claims
1. A method of selecting a patient for cardiac contractility modulation therapy, comprising: selecting a patient meeting a criteria for cardiac resynchronization therapy (CRT); detecting a potential difficulty in effective delivery of said CRT to said patient; and determining that said patient can benefit from cardiac contractility modulation therapy in spite of said potential difficulty.
2. (canceled)
3. A method according to claim 1, wherein said detecting comprises receiving an indication that said patient suffers from one or more comorbidities selected from a list comprising renal insufficiency, diabetes mellitus, chronic obstructive pulmonary disease, sleeping disorders like apnea, and anemia.
4. A method according to claim 1, wherein said detecting comprises receiving an indication that said patient suffers from cardiac arrhythmia.
5. A method according to claim 4, wherein said cardiac arrhythmia comprises a non-left bundle branch block (non-LBBB).
6. A method according to claim 1, wherein said determining comprises receiving an indication that said patient suffers from heart failure in NYHA classes II-IV.
7. A method according claim 1, wherein said determining comprises receiving an indication that said patient suffers from a left ventricular ejection fraction in a range between 25% - 55%.
8. A method according to claim 7, wherein said determining comprises receiving an indication that the patient exhibits a normal QRS duration, which is larger than 130 ms.
9. A method according to claim 1, wherein said determining comprises setting a pulse generator of a cardiac device with parameters of a testing electric field for cardiac contractility modulation to be delivered through at least one electrode lead to the heart, and determining that an effect of said testing electric field on said patient indicates that said patient can benefit from cardiac contractility modulation therapy through said at least one electrode lead.
10-11. (canceled)
12. A method according to claim 1, comprising: selecting a cardiac tissue location suitable for delivery of cardiac contractility modulation and CRT therapy through said at least one electrode lead.
13-15. (canceled)
16. A method according to claim 1, comprising: identifying that an effect of CRT is not a planned effect.
17. (canceled)
18. A method according to claim 16, wherein said identifying comprises identifying that said CRT effect comprises at least one undesired side effect.
19. A method according to claim 18, wherein said at least one undesired side effect comprises pain sensation and/or arrhythmia.
20-21. (canceled)
22. A method according to claim 1, comprising selecting a treatment plan in which a dual purpose device is configured to generate electric fields for both CRT and cardiac contractility modulation therapy.
23. A method according to claim 22, wherein said dual purpose device is configured to time said CCM electric field during a refractory period of the heart as a train of biphasic bipolar pulses.
24-25. (canceled)
26. A method according to claim 1, wherein said treating comprises treating said patient with cardiac contractility modulation therapy in combination with CRT.
27. (canceled)
28. A method according to claim 26, wherein said treating comprises delivering an electric field for CRT and cardiac contractility modulation therapy through a same electrode lead.
29. (canceled)
30. A method according to claim 26, wherein said treating comprises delivering an extended pacing signal for both CRT and cardiac contractility modulation therapy effects during a non-refractory period of the right ventricle.
31. A method according to claim 26, comprising: determining if treating said patient with said cardiac contractility modulation and said CRT has a desired effect on cardiac output and/or heart contraction; modifying said CRT therapy based on the results of said determining.
32. A method of selecting a patient for cardiac contractility modulation therapy comprising: identifying that an effect of CRT delivered is not a beneficial effect on said patient; and modifying a setting of a cardiac device controller to generate a cardiac contractility modulation electric field based on the results of said identifying.
33-35. (canceled)
36. A method according to claim 1, wherein said detecting comprises identifying that said CRT delivery to said patient does not result in a beneficial effect on at least one of ejection fraction, intracardiac pressure, intra cardiac pressure gradient over a selected time period, NYHA class score, Peak VO2 and 6 minute walk score.
37-46. (canceled)
47. A method for testing at least one electrode lead for delivery of cardiac contractility modulation therapy, comprising: determining to deliver CRT to a patient; implanting in said patient two or more electrode leads in the heart at locations suitable for delivery of said CRT; and testing if at least one electrode lead out of the two or more electrode leads is suitable for delivery of cardiac contractility modulation therapy.
48-63. (canceled)
Description
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)
[0154] Some embodiments of the invention are herein described, by way of example only, with reference to the accompanying drawings. With specific reference now to the drawings in detail, it is stressed that the particulars shown are by way of example and for purposes of illustrative discussion of embodiments of the invention. In this regard, the description taken with the drawings makes apparent to those skilled in the art how embodiments of the invention may be practiced.
[0155] In the drawings:
[0156]
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DESCRIPTION OF SPECIFIC EMBODIMENTS OF THE INVENTION
[0164] The present invention, in some embodiments thereof, relates to cardiac contractility modulation therapy and, more particularly, but not exclusively, to cardiac contractility modulation for cardiac resynchronization therapy (CRT) candidates.
[0165] An aspect of some embodiments relates to selecting patients for cardiac contractility modulation therapy. In some embodiments, the patients are candidates for a CRT treatment. In some embodiments, patients are selected for the cardiac contractility modulation therapy based on a probability that they will not respond to the CRT treatment, or that their response to the CRT treatment will not result with a desired therapeutic effect. In some embodiments, the patients are selected for the cardiac contractility modulation treatment prior to implantation of a cardiac pulse generator in their body.
[0166] As used herein in some embodiments of the invention, a CRT comprises providing synchronization treatment having typical configuration of at least 3 leads, for example a Right Atrial lead placed in the right atria, a Right ventricle lead that is placed in the right ventricle, in proximity to the ventricle septum, and a Left ventricle lead that is inserted through the coronary sinus into one of the left ventricle cardiac veins. In some embodiments, one or more of the CRT leads comprise at least one anchor, configured to anchor at least a portion of the lead, for example a distal portion of the lead, to cardiac tissue. In some embodiments, the at least one anchor comprises a screw, configured to allow screwing of the at least portion to the cardiac tissue. In some embodiments, one or more of the CRT leads are used to sense the electrical signal of the heart muscle and to pace the heart. In some embodiments, a pacing pulse, for example an electric field configured to generate pacing of the heart, has an amplitude of 3 V-7 V, for example 3 V-6 V, 4 V-5.5 V, 4.5 V-6 V, 5 V-7 V, 4 V, 5 V or any intermediate, smaller or larger value or range of values. In some embodiments, the delivered electric field has a duration, for example a pulse width, in a range of 0.1 milliseconds (ms)-0.8 ms, for example 0.1 ms-0.5 ms, 0.3 ms-0.6 ms, 0.4 ms-0.6 ms, 0.5 ms-0.6 ms, 0.6 ms-0.8 ms or any intermediate, shorter or longer range of values. In some embodiments, the pulse width has a duration of at least 0.3 ms, for example 0.4 ms, 0.5 ms, 0.6 ms or any intermediate, shorter or longer time duration
[0167] As used herein in some embodiments of the invention, a cardiac contractility modulation therapy comprises delivering of electric field pulses, for example as shown in
[0168] According to some embodiments, CRT candidates are selected for cardiac contractility modulation based on at least one clinical parameter, for example history of atrial fibrillation (AF), diagnosed with ischemic cardiomyopathy, having lower percentage of CRT pacing, for example having an average ratio between CRT pacing beats and a number heart beats in a selected time period, is lower than 90%, for example lower than 80%, lower than 70% or any intermediate, smaller or larger value. In some embodiments, the selected time period for measuring the ration is at least 1 day, for example a day, a week, a month, 3 months or any intermediate, shorter or longer time period.
[0169] Alternatively or additionally, CRT candidates are selected for cardiac contractility modulation if they are diagnosed one, two or more comorbidities, for example renal insufficiency, diabetes mellitus, chronic obstructive pulmonary disease, sleeping disorders like apnea, and anemia. In some embodiments, CRT candidates are selected for cardiac contractility modulation based on results of a cardiac electrophysiological analysis, for example, subjects that exhibit non-left bundle branch block.
[0170] An aspect of some embodiments relates to treating patients receiving CRT with cardiac contractility modulation. In some embodiments, an activation mode of a device used to deliver CRT is changed to deliver cardiac contractility modulation. Alternatively, a device used to deliver CRT is replaced with a device configured to deliver cardiac contractility modulation. In some embodiments, patients receiving CRT are switched to receive cardiac contractility modulation therapy based on measurements of at least one clinical or physiological parameter related to heart contractility and/or propagation of electrical signals in the heart.
[0171] According to some embodiments, a device comprising a pulse generator, for example an implanted pulse generator (IPG), delivering CRT to a subject, measures at least one physiological parameter during and/or following delivery of an electric field pulse to the heart, indicating a response of the heart to the CRT. Alternatively or additionally, the at least one parameter is measured by a different device, for example a device implanted in the body or a device located outside the body. In some embodiments, the at least one physiological parameter is indicative of cardiac output and/or heart contraction. In some embodiments, the at least one physiological parameter comprises at least one of ejection fraction, cardiac output, intra cardiac pressure, intra cardiac pressure gradient over a selected time period, NYHA class score, Peak VO2, 6 min. walk score.
[0172] According to some embodiments, a controller of the device determines that a response of the subject to the delivered CRT, for example to the delivered electric field, is not a desired response, optionally based on the at least one measured physiological parameter. In some embodiments, if the determined response is not a desired response, the device modifies values of at least one activation parameter of the pulse generator, for example to allow delivery of cardiac contractility modulation therapy to the heart. In some embodiments, the at least one activation parameter comprises at least one of electric field intensity, delivery timing of the electric field with respect to heart contractility and/or electric field duration. Alternatively or additionally, the at least one activation parameter comprises number and/or location of electrodes to deliver the cardiac contractility modulation therapy.
[0173] According to some embodiments, if the determined response is not a desired response, then a device used to deliver CRT is replaced with a cardiac contractility modulation device configured to deliver cardiac contractility modulation therapy. In some embodiments, the cardiac contractility modulation device is connected to at least some of the electrode leads used to deliver CRT. Alternatively or additionally, at least one new electrode lead is connected to the cardiac contractility modulation and implanted, for example to position an electrode at the end of the electrode lead at a specific position in the heart, selected to provide cardiac contractility modulation. Optionally, two or more new electrode leads carrying electrodes are implanted in the body to provide the cardiac contractility modulation therapy. In some embodiments, existing implantable CRT ventricle leads are used for cardiac contractility modulation stimulation or cardiac contractility modulation testing.
[0174] According to some embodiments, CRT is delivered in combination with cardiac contractility modulation therapy, for example by a dual purpose device. In some embodiments, CRT is combined with cardiac contractility modulation therapy if a response, for example a physiological response or a clinical response of a subject to CRT alone is not a desired response. In some embodiments, cardiac contractility modulation therapy is delivered in synchronization with the CRT.
[0175] According to some embodiments, at least one of the electrode leads connected to the dual purpose device is used to deliver pacing, for example as part of the CRT, and at least one different electrode lead is used to deliver cardiac contractility modulation. Alternatively, at least one of the electrode leads connected to the dual purpose device is used to deliver both cardiac contractility modulation therapy and pacing at different time points.
[0176] According to some embodiments, cardiac contractility modulation is delivered by at least one electrode positioned in the right ventricle (RV) of the heart, and pacing is delivered by at least one different electrode positioned in the left ventricle (LV) of the heart. Alternatively, cardiac contractility modulation therapy is delivered by at least one electrode positioned in the RV, and at least one electrode positioned in the LV, and pacing is delivered by at least one different electrode in the LV, or by the same electrode positioned in the LV for delivering cardiac contractility modulation therapy. In some embodiments, both cardiac contractility modulation therapy and pacing are delivered to the RV and LV by different electrodes or by at least one shared electrode.
[0177] According to some embodiments, cardiac contractility modulation is delivered in synchronization with the delivery of pacing, and/or in synchronization with heart contraction. In some embodiments, and electric field for cardiac contractility modulation stimulation is generated with parameter values, for example intensity, amplitude and/or frequency suitable for a dual effect of pacing and cardiac contractility modulation in the same stimulation pulse. Optionally, the dual effect of pacing and cardiac contractility modulation is generated using at least one electrode lead, for example a CRT lead, positioned in a location in heart that is suitable for generating the dual effect on the heart.
[0178] According to some embodiments, cardiac contractility modulation is delivered after S wave timing shown in an electrocardiogram (ECG), that represents, for example, depolarization of Purkinje fibers. In some embodiments, cardiac contractility modulation is delivered up to 0.06 seconds, for example up to 0.04 seconds, up to 0.03 second, up to 0.02 seconds after detecting ventricle contraction. In some embodiments, at least one electrode lead positioned in the right ventricle is used to detect ventricle contraction and to deliver an electric field with parameter values suitable for cardiac contractility modulation therapy. In some embodiments, two or more electrod leads, for example 3 or 4 electrode leads in the right ventricle are used for sensing and delivery of cardiac contractility modulation pacing.
[0179] According to some embodiments, cardiac contractility modulation therapy is delivered during or following pacing in the LV, for example when combined with CRT. In some embodiments, cardiac contractility modulation is delivered up to 0.06 seconds, for example up to 0.04 seconds, up to 0.03 second, up to 0.02 seconds after detecting contraction of the right ventricle or following the delivery of CRT. In some embodiments, A potential advantage of delivering cardiac contractility modulation therapy during or following pacing in LV may be to promote cardiac contractility in the LV tissue.
[0180] According to some embodiments, CRT is added to a cardiac contractility modulation therapy delivered to the heart. In some embodiments, in case the addition of CRT does not improve heart contractility, then CRT is stopped while keeping cardiac contractility modulation therapy. In some embodiments, cardiac contractility modulation is delivered after CRT pacing at specific conditions, for example when a measured heart rate is higher than the patient average heart rate, for example by more than 0%, 5%, 10%, 20%, 40%, or any intermediate, smaller or larger value. Alternatively, or additionally, cardiac contractility modulation is delivered after CRT pacing during sleep or during specific sleep stages, for example deep sleep, Rapid Eye Movement (REM) sleep or non-REM sleep. Alternatively, or additionally, cardiac contractility modulation is delivered after CRT pacing if atrial arrhythmia is detected.
[0181] An aspect of some embodiments relates to using at least one existing previously implanted electrode lead, for example a CRT lead, for cardiac contractility modulation therapy. In some embodiments, at least one previously implanted electrode lead is selected from two or more previously implanted electrode leads for delivery of cardiac contractility modulation therapy. In some embodiments, the at least one electrode lead is selected by delivery of a testing electric field with parameters of cardiac contractility modulation therapy through the at least one electrode lead, and determining the effect of the delivered electric field. Alternatively, the testing electric field is delivered through two or more previously implanted electrode leads, and at least one electrode lead that is more suitable for delivery of cardiac contractility modulation therapy is selected out of the two or more previously implanted electreode leads. Optionally, at least one electrode lead previously used for CRT is selected for delivery cardiac contractility modulation therapy only or for delivery cardiac contractility modulation therapy in combination with CRT.
[0182] According to some embodiments, the appearance of undesired side effects, for example pain or unpleasant sensation following and/or during the electric field delivery is determined. In some embodiments, the at least one electrode lead for cardiac contractility modulation therapy is selected, optionally out of two or more electrode leads, based on the appearance of undesired side effects. In some embodiments, the at least one electrode lead is selected for cardiac contractility modulation is delivery of the testing electric field through the electrode did not cause undesired side effects, or caused tolerable undesired side effect in the patient. In some embodiments, if an undesired side effect is detected then at least one different electrode lead is selected for delivery of the testing electric field.
[0183] According to some embodiments, at least one electrode lead out of two or more electrode leads is selected to deliver cardiac contractility modulation based on measurements of at least one clinical or physiological parameter indicative of cardiac output and/or heart contraction following the delivery of the testing electric field.
[0184] According to some embodiments, at least one electrode lead, for example a CRT lead is implanted in advance in a location that can be used to deliver cardiac contractility modulation therapy. Optionally, two or more CRT leads, for example 2, 3, 4 CRT leads are implanted in advance in locations that can be used to deliver cardiac contractility modulation therapy. In some embodiments, the at least one location suitable to deliver cardiac contractility modulation comprises the right ventricle (RV), the left ventricle (LV), the right atrium (RA) or any combination of two or more CRT leads in these locations.
[0185] According to some exemplary embodiments, at least one electrode of an electrode lead configured to deliver both CRT and cardiac contractility modulation therapy is implanted in the RV. In some embodiments, the electrode has active fixation, for example using an electrically-active helix.
[0186] According to some embodiments, an electrode of an electrode lead configured to deliver both CRT and cardiac contractility modulation has a surface area of at least 2 mm.sup.2, for example at least 4 mm.sup.2, at least 6 mm.sup.2 or any intermediate, smaller or larger surface area. Additionally or alternatively, the electrode is coated with a high-capacitance, low-polarization coating, for example titanium nitride or iridium oxide.
[0187] An aspect of some embodiments relates to delivering an electric field with parameter values suitable for cardiac contractility modulation therapy to induce pacing of the heart. In some embodiments, the electric field is delivered to patients that does not respond to CRT or to patients predicted not to respond to CRT. In some embodiments, an electric field with cardiac contractility modulation parameter values is delivered to induce pacing and promote cardiac contractility modulation therapy to the heart.
[0188] According to some embodiments, an electric field with cardiac contractility modulation parameter values is delivered to induce pacing by at least one electrode lead positioned in the right ventricle and/or in the left ventricle. In some embodiments, an extended pacing signal is delivered for said CRT and cardiac contractility modulation, for example as described in U.S. Pat. US7460907B1.
[0189] Before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not necessarily limited in its application to the details of construction and the arrangement of the components and/or methods set forth in the following description and/or illustrated in the drawings and/or the Examples. The invention is capable of other embodiments or of being practiced or carried out in various ways.
Exemplary General Process for Delivery of Cardiac Contractility Modulation to Patients Not Responding to CRT
[0190] According to some exemplary embodiments, cardiac contractility modulation is delivered to patients that do not show a desired response to CRT treatment, for example patients that do not exhibit desired heart contractility following CRT. Reference is no made to
[0191] According to some exemplary embodiments, an undesired response to CRT therapy is identified at block 102. In some embodiments, an undesired response is a response of the heart and/or body of the patient that indicates an effect, which is lower than a desired effect of the CRT therapy. In some embodiments, the undesired response is identified based on measurements of at least one physiological parameter related to heart activity.
[0192] According to some exemplary embodiments, an undesired effect of the CRT is identified by measuring at least one parameter related to cardiac output, for example ejection fraction of the heart, and/or stroke volume. In some embodiments, the undesired effect of CRT is detected at least 24 hours following CRT initiation, for example at least 1 week, at least 1 month or any intermediate, shorter or longer time period following CRT initiation.
[0193] According to some exemplary embodiments, a response to the CRT is measured from inside the body, for example by at least one implanted electrode. Optionally, the at least one implanted electrode is connected to an implanted CRT device. Alternatively, the at least one electrode is connected to a different measurement device, implanted inside the body or positioned outside the body.
[0194] According to some exemplary embodiments, the response to the CRT is measured from outside the body, for example by at least one electrode placed on the external surface of the skin. Alternatively, or additionally, the response to the CRT is measured by at least one imaging device, for example an ultrasound device, a magnetic resonance imaging (MRI) device, and/or a computerized tomography (CT) device. In some embodiments, the at least one imaging device, for example an ultrasound device, is implanted inside the body.
[0195] According to some exemplary embodiments, when an undesired response to CRT is identified, a cardiac contractility modulation device configured to deliver cardiac contractility modulation therapy is implanted at block 104. In some embodiments, the implanted cardiac contractility modulation device replaces an existing CRT device that is removed from the body of the patient. In some embodiments, the newly implanted cardiac contractility modulation device is electrically connected to one or more CRT leads already implanted in the body, for example in the heart. Alternatively, the implanted cardiac contractility modulation device is implanted in addition to the existing CRT device already implanted in the body. In some embodiments, the implanted cardiac contractility modulation device is electrically connected to at least one CRT lead, which is optionally also connected to the CRT device.
[0196] According to some exemplary embodiments, the new implanted cardiac contractility modulation device delivers cardiac contractility modulation therapy at block 106.
[0197] According to some exemplary embodiments, when an undesired response to CRT is identified, a CRT device used to deliver the CRT is switched to a cardiac contractility modulation therapy activation protocol at block 108. In some embodiments, a cardiac contractility modulation therapy protocol is activated in a CRT device, for example in a dual-purpose device, at block 108. Alternatively, a different electrode lead connected to the CRT device is used to deliver cardiac contractility modulation therapy. Optionally, values of one or more parameters of an electric field are modified in order to provide the cardiac contractility modulation therapy, for example pulse duration, amplitude, and/or frequency.
[0198] According to some exemplary embodiments, when an undesired response to CRT is identified, at least one cardiac contractility modulation therapy protocol or parameters thereof is added to an already implanted CRT device, at block 110. In some embodiments, the at least one cardiac contractility modulation therapy protocol or parameters thereof are uploaded to an implanted CRT device from outside the body. In some embodiments, the implanted device is configured to deliver both CRT and cardiac contractility modulation in combination, for example pacing through at least one electrode lead, and cardiac contractility modulation through at least one different electrode lead, where both electrode leads are connected to the same device. In some embodiments, the CRT and cardiac contractility modulation therapy protocols are synchronized, for example a cardiac contractility modulation pulse is configured to be delivered shortly after pacing is delivered, and following left ventricle contraction. In some embodiments, a cardiac contractility modulation pulse is configured to be delivered shortly after pacing is delivered and during a refractory period of the heart.
[0199] According to some exemplary embodiments, CRT and cardiac contractility modulation therapy are delivered by the same device at block 112. In some embodiments, the CRT and the cardiac contractility modulation therapy are delivered in synchronization. Alternatively or additionally, the CRT and the cardiac contractility modulation therapy are delivered intermittently by the same device, for example by the same implantable device.
Exemplary Locations for Cardiac Contractility Modulation Therapy
[0200] According to some exemplary embodiments, one or more electrode leads are implanted in the heart. In some embodiments, one or more electrodes on the electrode leads are implanted in locations suitable for delivery of pacing, for example as part of CRT. In some embodiments, at least some of the locations of electrodes used for pacing are also suitable for delivery of cardiac contractility modulation. Reference is now made to
[0201] According to some exemplary embodiments, at least one electrode lead, for example 2 electrode leads, 3 electrode leads, 3 electrode leads, 4 electrode leads, or any larger number of electrode leads are implanted in the heart. In some embodiments, each electrode lead comprises at least one electrode, for example 2, 3, 4, 5 or any larger number of electrodes. In some embodiments, at least some of the electrode leads, for example a distal end of the electrode leads is anchored to the heart tissue.
[0202] According to some exemplary embodiments, at least one electrode lead used for delivery of CRT is anchored within the heart 200, for example electrode lead 208. In some embodiments, at least one electrode lead used for delivery of CRT, for example lead 208 is anchored within a right ventricle of the heart 204. Alternatively or additionally, at least one electrode lead, for example lead 212 used for CRT is anchored within the right atrium 210. Alternatively or additionally at least one CRT electrode lead 216 is inserted through the coronary sinus, and is positioned to deliver an electric field to the left ventricle (LV).
[0203] According to some exemplary embodiments, CRT is delivered by at least one electrode lead positioned within the right ventricle 204, for example electrode lead 208 or 220, and optionally at least one electrode lead positioned within or near the left ventricle 214, for example electrode lead 216 inserted through the coronary sinus. Optionally, an electrode lead located within the heart ventricle 214 is used for cardiac contractility modulation, CRT or a combination of both CRT and cardiac contractility modulation therapy.
[0204] According to some exemplary embodiments, the CRT leads are electrically connected to an implanted pulse generator (IPG), for example IPG 202. In some embodiments, the IPG 202 is configured to deliver both cardiac contractility modulation and CRT through the electrode leads. In some embodiments, the IPG 202 is configured to deliver CRT and cardiac contractility modulation through the same lead. Alternatively, at least one lead connectd to the IPG 202 is used to deliver CRT, and at least one different electrode lead is used to deliver cardiac contractility modulation therapy. In some embodiments, at least one electrode lead, for example electrode lead 220 is used to deliver cardiac contractility modulation only.
[0205] According to some exemplary embodiments, if an IPG is configured to deliver only CRT, then a cardiac contractility modulation IPG is implanted and is electrically connected to at least one electrode lead already implanted in the heart in a location suitable to deliver cardiac contractility modulation therapy. Alternatively, at least one new electrode lead for cardiac contractility modulation therapy is implanted, for example when implanting a cardiac contractility modulation IPG, in a preferred location in the heart or in surrounding blood vessels, for delivery of cardiac contractility modulation therapy.
[0206] According to some exemplary embodiments, at least one electrode lead is implanted in advance to allow delivery of cardiac contractility modulation therapy to the heart. In some embodiments, the at least one electrode lead suitable for delivery of cardiac contractility modulation therapy is implanted in advance within the right ventricle 204 or within the left ventricle 214. Alternatively or additionally, the at least one electrode lead suitable for delivery of cardiac contractility modulation therapy is implanted in advance within a blood vessel at a distance of up to 1 cm, for example up to 0.5 cm, up to 0.1 cm or any intermediate, smaller or larger distance from the heart. In some embodiments, the blood vessel comprises a vein of the heart, for example the coronary sinus. In some embodiments, the at least one electrode lead suitable for delivery of cardiac contractility modulation therapy is anchored in advance to the heart septum. In some embodiments, two or more electrode leads implanted in advance, for example when implanting a CRT device and/or CRT leads, are used to deliver cardiac contractility modulation therapy.
Exemplary Cardiac Contractility Modulation Therapy for Previously Identified CRT Non-Responders
[0207] According to some exemplary embodiments, patients that are candidates for CRT are evaluated, for example to determine a potential effect of the CRT in each patient. In some embodiments, if the potential effect is lower than a desired effect, cardiac contractility modulation therapy is considered as a replacement to CRT or in combination with CRT. Optionally, if the potential effect of the CRT is a desired effect, then at least some of the implanted components, for example at least some of the implanted electrode leads can also be used to deliver cardiac contractility modulation therapy, in case a lower effect of the CRT is identified post implantation, for example during CRT delivery.
[0208] Reference is now made to
[0209] According to some exemplary embodiments, a patient is diagnosed at block 303. In some embodiments, the patient is diagnosed by measuring at least one physiological parameter related to the heart function, for example at least one parameter indicating cardiac output and/or cardiac contraction. Additionally or alternatively, an electrophysiological and/or an imaging analysis is performed for monitoring heart function, for example at least one of ECG, Echo imaging, CT and/or MRI. Additionally, during diagnosis, a medical history of the patient and/or the family of the patient is collected and examined.
[0210] According to some exemplary embodiments, a patient is selected for CRT at block 305. In some embodiments, the patient is selected for CRT based on the results of the diagnosis performed at block 303. In some embodiments, a patient is selected for CRT if the results of the diagnosis performed at block 303 indicate irregular heart contraction and/or insufficient cardiac output.
[0211] According to some exemplary embodiments, a potential difficulty in the delivering the CRT treatment is detected at block 307. In some embodiments, detecting a potential difficulty in delivering CRT comprises detecting that delivery of CRT will result with unwanted side effects, for example unpleasant sensation. Alternatively or additionally, detecting a potential difficulty comprises detecting that delivery of CRT to the patient will not result with a beneficial effect on heart failure condition parameters, for example will not result with a beneficial effect on heart beat and/or cardiac output. In some embodiments, detecting that delivery of CRT to the patient will not result with a beneficial effect comprises detecting that delivery of the CRT will results with an effect which is lower in at least 2%, for example at least 5%, at least 10%, at least 15%, at least 20% or any intermediate, smaller or larger percentage, from a desired beneficial effect.
[0212] According to some exemplary embodiments, detecting a potential difficulty in delivering CRT comprises detecting that in order to benefit from the CRT, an invasive procedure needs to be performed on the patient, for example an ablative procedure. In some embodiments, detecting a potential difficulty in delivering CRT comprises diagnosing the patient with at least one of atrial fibrillation (AF), ischemic cardiomyopathy, lower percentage of CRT pacing, for example having an average ratio between CRT pacing beats and a number heart beats in a selected time period, is lower than 90%, for example lower than 80%, lower than 70% or any intermediate, smaller or larger value. In some embodiments, the selected time period for measuring the ratio is at least 1 day, for example a day, a week, a month, 3 months or any intermediate, shorter or longer time period.
[0213] According to some exemplary embodiments, detecting a potential difficulty in delivering CRT comprises diagnosing the patient with one or more comorbidities selected from a list comprising renal insufficiency, diabetes mellitus, chronic obstructive pulmonary disease, sleeping disorders like apnea, and anemia. Alternatively or additionally, detecting a potential difficulty in delivering CRT comprises diagnosing the patient with cardiac arrhythmia, for example non-left bundle branch block (non-LBBB).
[0214] According to some exemplary embodiments, detecting a potential difficulty in delivering CRT comprises detecting that delivery of CRT to the patient will not result with a beneficial effect on cardiac output, for example a desired increase in cardiac output of at least 0.5 ml, for example at least 1 ml, at least 3 ml, at least 5 ml or any intermediate, smaller or larger increase in cardiac output.
[0215] Alternatively or additionally, detecting a potential difficulty in delivering CRT comprises detecting that delivery of CRT to the patient will not result with a beneficial effect on ejection fraction, for example will not result with a desired increase of at least 0.5%, for example at least 1%, at least 3%, at least 5% or any intermediate, smaller or larger percentage of increase in ejection fraction.
[0216] Alternatively or additionally, detecting a potential difficulty in delivering CRT comprises detecting that delivery of CRT to the patient will not result with a beneficial effect on at least one of the following parameters, intracardiac pressure, intra cardiac pressure gradient over a selected time period, NYHA class score, Peak VO2 and/or 6 minute walk score. In some embodiments, a beneficial effect comprises an improvement in the parameters compared to a baseline value measured before CRT implantation and/or after CRT implantation.
[0217] According to some exemplary embodiments, at block 309 it is determined if the patient can benefit from cardiac contractility modulation therapy. In some embodiments, determining if the patient can benefit from cardiac contractility modulation therapy comprises diagnosing a patient with heart failure. In some embodiments, determining that a patient can benefit from cardiac contractility modulation comprises diagnosing the patient with heart failure in NYHA classes II-IV. Alternatively or additionally, the patient is diagnosed with a left ventricular ejection fraction in a range between 25% - 55%, for example 25%-40%, 30%-45%, 40%-55% or any intermediate, smaller or larger range of values. In some embodiments, determining that a patient can benefit from cardiac contractility modulation comprises diagnosing the patient with normal QRS duration, for example QRS duration larger than 120 ms, for example larger than 130 ms, larger than 140 ms or any intermediate, smaller or larger value.
[0218] According to some exemplary embodiments, the patient is treated with cardiac contractility modulation therapy at block 311. In some embodiments, the patient is treated with cardiac contractility modulation therapy based on the results of the determining performed at block 311. In some embodiments, a cardiac contractility modulation therapy comprises delivering of electric field pulses during a refractory period of the ventricles, for example a time period in which electrical signals cannot trigger new cardiac muscle contractions. In some embodiments, during cardiac contractility modulation therapy, a train of biphasic bipolar pulses is transmitted from the same location, with an amplitude of at least 5 V, for example 5 V, 6 V, 7 V, 8 V, 9 V or any intermediate, smaller or larger value. In some embodiments, the train of biphasic bipolar pulses is transmitted for a time period in a range of 8 ms-13 ms, for example 8 ms-10 ms, 9 ms-10.5 ms, 9.5 ms-12 ms, 9 ms-13 ms or any intermediate, smaller or larger range of values.
[0219] Reference is now made to
[0220] According to some exemplary embodiments, a subject is diagnosed at block 302. In some embodiments, during subject diagnosis, clinical data and/or medical history is collected on the subject and optionally on the subject family. In some embodiments, during diagnosis, at least one cardiac parameter is measured, for example electrical activity of the heart, contraction degree of at least part of the heart, for example contraction of the left ventricle, and/or heart rate. Alternatively, or additionally, during subject diagnosis, electrical conduction for example through heart tissue, and/or between the atria and ventricles, is measured. In some embodiments, during diagnosis information related to heart contraction pathologies, for example atrial fibrillation is collected. Alternatively or additionally, during diagnosis information related to heart failure is collected, for example QRS duration. In some embodiments, at least some of the information is collected using at least one imaging technique, for example ultrasound, and/or echocardiography. Alternatively or additionally, at least some of the information is collected using electrocardiogram analysis.
[0221] According to some exemplary embodiments, a subject is diagnosed with heart failure, at block 302. Additionally, the subject is diagnosed with a Left Bundle Branch Block (LBBB) with a QRS duration larger than or equal to 120 ms, for example 125 ms, 130 ms or any intermediate, smaller or larger value. Alternatively, the subject, for example the subject diagnosed with heart failure, is also diagnosed as non-LBBB with QRS duration larger than or equal to 150 ms, for example 155 ms, 160 ms, 170 ms or any intermediate, smaller or larger value. Additionally or alternatively, during diagnosis at block 302, the subject is classified according to the New York Heart Association (NYHA) stages of heart failure.
[0222] According to some exemplary embodiments, a need of a subject to receive CRT is determined at block 304. In some embodiments, a subject is selected for CRT based on the subject diagnosis performed at block 302. In some embodiments, a subject with Left Bundle Branch Block (LBBB) with a QRS duration larger than 100 ms, for example larger than 110 ms, larger than 120 ms, larger than 130 ms or any intermediate, smaller or larger value of QRS duration is selected for CRT. In some embodiments, a subject in a New York Heart Association (NYHA) Classification II, III or IV, optionally non suffering from LBBB, with QRS duration larger than 130 ms, for example larger than 140 ms, larger than 150 ms, larger than 160 ms or any intermediate, smaller or larger value, is selected for CRT.
[0223] According to some exemplary embodiments, a risk that a subject selected for CRT is a CRT non-responder, is estimated at block 306. In some embodiments, a risk indicating that a subject selected for CRT is a CRT non-responder is calculated at block 306, for example using at least one of an algorithm and/or a lookup table, based on the data collected during subject diagnosis.
[0224] According to some exemplary embodiments, a treatment plan is selected for the subject based on the calculated risk indication. In some embodiments, if the calculated risk indication is low, for example lower than a predetermined value, a CRT device with CRT leads is implanted, for example to deliver CRT therapy. In some embodiments, if the risk is very high, for example higher than a predetermined value, CRT is not considered as a potential treatment and a cardiac contractility modulation device with cardiac contractility modulation leads is implanted at 308, for example to deliver cardiac contractility modulation therapy only. In some embodiments, if the risk indication is moderate, for example too high for delivery of only CRT and is lower than an indication for delivering of cardiac contractility modulation therapy only, then it is possible to implant a dual purpose device and to deliver both CRT and cardiac contractility modulation therapy at block 312. Alternatively, a CRT device with at least one cardiac contractility modulation lead is implanted at block 318, for delivery of CRT at block 320, while keeping the option to replace the device with a cardiac contractility modulation device or a dual purpose device, for delivery of cardiac contractility modulation therapy using the previously implanted electrode lead, in case CRT delivery is not effective.
[0225] According to some exemplary embodiments, if a risk of a subject not to respond to CRT with a desired response is higher than a predetermined value, then a cardiac contractility modulation device is implanted in the subject at block 308. In some embodiments, the implanted cardiac contractility modulation device is configured to deliver only cardiac contractility modulation to the subject. In some embodiments, at least one electrode lead, for example 2, 3, 4, 5 electrode leads configured to deliver cardiac contractility modulation therapy are implanted at locations that are favorable for delivery of cardiac contractility modulation therapy, for example an electrode lead anchored to the Right ventricle septum wall.
[0226] In some embodiments, at least one of the implanted electrode leads is implanted in locations that are suitable for delivery of CRT.
[0227] According to some exemplary embodiments, once the cardiac contractility modulation device and the electrode leads are implanted, cardiac contractility modulation therapy is delivered at block 310.
[0228] According to some exemplary embodiments, if a risk of a subject not to respond to CRT with a desired response is higher than a predetermined value, then a dual purpose device configured to deliver both CRT and cardiac contractility modulation is implanted in the subject at block 311. In some embodiments, the dual purpose device is implanted with at least one electrode lead configured to deliver CRT in a location suitable for delivery of CRT, and at least one additional electrode lead configured to deliver cardiac contractility modulation in a location suitable for delivery of cardiac contractility modulation therapy. Alternatively, the dual purpose device is implanted at block 311 with at least one electrode configured to deliver both CRT and cardiac contractility modulation therapy, in a location in the heart suitable for delivery both CRT and cardiac contractility modulation therapy for example in the right ventricle septum wall.
[0229] According to some exemplary embodiments, once the dual purpose device and the at least one electrode lead is implanted, CRT and cardiac contractility modulation are delivered at block 312. Optionally, the CRT and cardiac contractility modulation therapy are delivered in synchronization. In some embodiments, the CRT and cardiac contractility modulation therapy are delivered intermittently. Optionally, the CRT and cardiac contractility modulation therapy are delivered according to a contraction sequence of the heart, for example according to contraction timing of the atria and ventricles.
[0230] According to some exemplary embodiments, if a risk of a subject not to respond to CRT with a desired response is high, for example higher than a predetermined value, then a CRT device with at least one electrode lead configured to deliver CRT and at least one electrode lead configured to deliver cardiac contractility modulation are implanted at block 318. In some embodiments, the at least one electrode configured to deliver CRT is implanted in a location favorable for delivery of CRT to the patient heart. Additionally, the at least one electrode lead configured to deliver cardiac contractility modulation therapy is implanted in a location favorable for delivery of CC, therapy to the patient heart. Alternatively, at least one electrode lead, configured to deliver both CRT and cardiac contractility modulation therapy is implanted in a location favorable for both CRT and cardiac contractility modulation therapy, for example as described in
[0231] According to some exemplary embodiments, CRT is delivered at block 320. In some embodiments, CRT is delivered while monitoring the effect of the delivered CRT on heart contraction. In some embodiments, an effect of the CRT on the heart of the patient is evident after at least 24 hours, at least 2 days, at least 1 week or any intermediate, shorter or longer time period, from initiating CRT delivery. In some embodiments, evaluation of the delivered CRT effect is performed at least 1 month, for example at least 2, 3, 4, 5, 6, 7, 8 months or any intermediate, shorter or monger time period following the initial delivery of CRT. In some embodiments, the effect of the delivered CRT is monitored by evaluating changes in heart failure parameters following CRT delivery, for example in comparison to a baseline value or any other reference.
[0232] According to some exemplary embodiments, if the monitored CRT effect is lower than a desired effect, then the CRT device is replaced with a dual purpose device that is configured to deliver both CRT and cardiac contractility modulation therapy, at block 322. In some embodiments, the dual purpose device is electrically connected to one or more of the previously implanted electrode leads.
[0233] According to some exemplary embodiments, if the monitored CRT effect is lower than a desired effect, then the CRT device is replaced with a device configured to deliver only cardiac contractility modulation, for example a cardiac contractility modulation device. In some embodiments, the cardiac contractility modulation device is electrically connected to one or more of the previously implanted leads that are configured to deliver cardiac contractility modulation therapy, for example that are positioned in a location suitable for delivery of cardiac contractility modulation therapy.
[0234] According to some exemplary embodiments, a decision whether to implant a cardiac contractility modulation only device or a dual purpose CRT and cardiac contractility modulation device, depends on the effect of CRT on the patient. In some embodiments, if the CRT effect is not a desired effect but combining CRT and cardiac contractility modulation is expected to result with a desired effect, then a dual purpose device is implanted. In some embodiments, if the CRT effect is lower than a desired effect and combining CRT with cardiac contractility modulation is not expected to result with a desired effect, then a cardiac contractility modulation only device is implanted.
[0235] According to some exemplary embodiments, if the CRT effect is not a desired effect, and the clinical condition of the patient is expected to be unstable, then a dual purpose CRT and cardiac contractility modulation device is implanted, for example to allow better treatment flexibility in the future.
Exemplary Cardiac Contractility Modulation Therapy Following CRT Delivery
[0236] According to some exemplary embodiments, a decision whether to provide cardiac contractility modulation therapy to a patient is made following delivery of CRT to the patient, and based on the results of the delivered CRT. Reference is now made to
[0237] According to some exemplary embodiments, a subject is diagnosed and a need to receive CRT is determined at block 304.
[0238] According to some exemplary embodiments, a CRT device is implanted at block 402. In some embodiments, the CRT device is configured to receive and transmit wireless signals to a device located outside the body.
[0239] According to some exemplary embodiments, at least one electrode lead comprising one or more electrodes is implanted in locations suitable for delivery of CRT to the heart of the subject, at block 404.
[0240] According to some exemplary embodiments, at least one electrode lead comprising one or more electrodes is implanted in locations suitable for delivery of cardiac contractility modulation therapy to the heart of the subject at block 406.
[0241] Alternatively or additionally, at least one electrode lead comprising one or more electrodes is implanted in locations suitable for delivery of CRT and cardiac contractility modulation to the heart.
[0242] According to some exemplary embodiments, CRT is delivered to the heart at block 408. In some embodiments, CRT is delivered through one or more of the electrodes implanted at block 404.
[0243] According to some exemplary embodiments, indications regarding a low effect of the CRT are received at block 410. In some embodiments, the indications are received based on measurements of at least one parameter related to the contraction of the heart, for example measurements performed from outside the body and/or from inside the body. In some embodiments, the indications are transmitted from the implanted CRT device to a device, for example a computer, and/or a cellular or a mobile phone located outside the body. In some embodiments, the indications are delivered to a remote server, and/or a remote cloud storage. In some embodiments, the indications are delivered to a physician, to a nurse or to a person monitoring a clinical condition of the patient.
[0244] According to some exemplary embodiments, based on the received indications, if the implanted device is a dual purpose device configured to deliver CRT and cardiac contractility modulation therapy, signals are transmitted to the device to switch to cardiac contractility modulation therapy only. In some embodiments, the signals delivered to the implanted device include at least one cardiac contractility modulation therapy protocol, values of at least one cardiac contractility modulation therapy parameter, for example electric field intensity, electric field frequency, duration of each pulse and/or information regarding synchronization of the cardiac contractility modulation therapy pulses with heart contraction and/or heart rhythm. In some embodiments, the signals delivered to the implanted device at block 412 comprises information on which of the implanted electrodes to use when delivering the cardiac contractility modulation therapy. In some embodiments, the signals delivered to the implanted device at block 412 include instructions to use at least one electrode implanted in a location suitable for cardiac contractility modulation therapy.
[0245] According to some exemplary embodiments, based on the received indications, if the implanted device is a dual purpose device configured to deliver CRT and cardiac contractility modulation therapy, signals are transmitted to the device to combine cardiac contractility modulation therapy with CRT, at block 414. In some embodiments, the signals delivered to the implanted device include at least one of a cardiac contractility modulation therapy protocol, values of at least one cardiac contractility modulation therapy parameter, for example electric field intensity, electric field frequency, duration of each pulse and/or information regarding synchronization of the cardiac contractility modulation therapy pulses with heart contraction, heart rhythm and/or with CRT. In some embodiments, the signals delivered to the implanted device at block 414 include instructions regarding which of the electrodes or electrode leads to use for cardiac contractility modulation therapy and which of the electrodes or electrode leads to use for CRT.
[0246] According to some exemplary embodiments, based on the received indications, the CRT device implanted at block 402 is replaced with a device that is configured to deliver cardiac contractility modulation only, at block 416. In some embodiments, the CRT device is removed from the body. Alternatively, a cardiac contractility modulation device is implanted while keeping the CRT device in the body.
[0247] According to some exemplary embodiments, the cardiac contractility modulation device is connected to at least one electrode lead, for example an electrode lead already implanted at block 406, positioned in a location suitable for delivery of cardiac contractility modulation.
[0248] According to some exemplary embodiments, signals are delivered to the implanted cardiac contractility modulation to initiate cardiac contractility modulation therapy at block 420.
[0249] According to some exemplary embodiments, based on the received indications, the CRT device implanted at block 402 is replaced with a dual purpose device that is configured to deliver CRT and cardiac contractility modulation therapy, at block 422. In some embodiments, the dual purpose device is electrically connected to at least one electrode lead located at a position suitable for delivery of CRT, and at least one electrode lead located at a position suitable for delivery cardiac contractility modulation, at block 424. Optionally, the dual purpose device is electrically connected to at least one electrode lead located at a position that is suitable for delivery of both CRT and cardiac contractility modulation therapy.
Exemplary Device
[0250] Reference is now made to
[0251] According to some exemplary embodiments, a device for delivery of cardiac contractility modulation therapy comprises an implantable pulse generator (IPG) unit, for example unit 502, electrically connected to at least one electrode lead positioned within the body. In some embodiments, the IPG unit 502 comprises at least one control circuitry 512 and at least one pulse generator 504, electrically connected to the control circuitry 512. In some embodiments, the pulse generator 504 is electrically connected to at least one, for example 2, 3, 4, 5, 6 or any larger number of electrode leads implanted in the body. In some embodiments, each electrode lead comprises at least one, for example 2, 3, 4, 5, 6 or any larger number of electrodes suitable for delivery of an electric field, for example as part of CRT and/or cardiac contractility modulation.
[0252] According to some exemplary embodiments, a casing of the IPG unit 502, for example casing 503 is shaped and sized to be implantable inside the body, for example subcutaneously implanted. In some embodiments, an external surface of the casing 503 is smooth, and is optionally planar. In some embodiments, the IPG unit is positioned outside the body, and is connected to at least one lead implanted inside the body.
[0253] According to some exemplary embodiments, the IPG unit 502 comprises a memory 514, for storing at least one cardiac contractility modulation protocol or parameters thereof. Additionally, the memory stores at least one CRT protocol or parameters thereof.
[0254] According to some exemplary embodiments, the pulse generator 504 is electrically connected to at least one electrode, for example cardiac contractility modulation electrode 506, configured to deliver cardiac contractility modulation therapy and positioned at a location suitable for delivery of cardiac contractility modulation therapy, for example as described in
[0255] According to some exemplary embodiments, the control circuitry 512 signals the pulse generator 504 to generate and deliver an electric field through the CRT electrode 508 with parameter values, for example electric field amplitude, electric field frequency, electric field pulse duration, suitable for CRT.
[0256] According to some exemplary embodiments, the control circuitry 512 signals the pulse generator 504 to generate and deliver an electric field through the cardiac contractility modulation electrode 506 with parameter values, for example electric field amplitude, electric field frequency, electric field pulse duration, suitable for cardiac contractility modulation therapy.
[0257] According to some exemplary embodiments, the IPG unit 502 comprises at least one measurement circuitry 516, electrically connected to the control circuitry 512. In some embodiments, the at least one measurement circuitry 516 is connected to at least one heart sensor, for example heart sensor 520, configured to record electrical signals, for example electrophysiological signals related to the heart activity. In some embodiments, the heart sensor 520 is configured to record signals related to heart contraction, for example contraction of at least one atrium, contraction of the left ventricle and/or contraction of the right ventricle. In some embodiments, the at least one heart sensor 520 is configured to record signals related to electrical conductance of heart tissue, for example heart tissue conductivity and/or heart tissue impedance.
[0258] According to some exemplary embodiments, the measurement circuitry 516 is connected to at least one additional sensor, for example body sensor 518, configured to record signals related to an electrophysiological parameter not related to heart activity, for example an implantable bio impedance sensor, intra cardiac pressure sensor that can measure cardiac performance parameters like ejection fraction, cardiac output, intra cardiac pressure, intra cardiac pressure gradient with time.
[0259] According to some exemplary embodiments, the control circuitry is configured to evaluate or determine an effect of CRT delivered by the IPG unit 502 to the heart, based on signals received from the sensors, 518 and 520 via the measurement circuitry 516. In some embodiments, the control circuitry 512 stores the signals or indications thereof, recorded from the electrodes in the memory 514.
[0260] According to some exemplary embodiments, the IPG unit 502 comprises a communication circuitry, for example communication circuitry 524, configured to receive and transmit signals, for example wireless signals from and to at least one external device located outside the body, for example a computer or a cellular device. In some embodiments, the communication circuitry 524 is configured to receive signals from at least one sensor located outside the body, for example at least one skin electrode. In some embodiments, the communication circuitry 524 is configured to receive signals from the external device, comprising at least one of a cardiac contractility modulation protocol, a CRT protocol, parameter values of an electric field used for CRT, parameter values of an electric field used for cardiac contractility modulation therapy. In some embodiments, information received via the communication circuitry 524 is stored in the memory 514.
[0261] According to some exemplary embodiments, the IPG unit 502 comprises a power source, for example power source 522. In some embodiments, the power source is a rechargeable power source, that can be recharged from outside the body, for example via wireless inductive charging. In some embodiments, the power source 522 is configured to deliver electric power to the IPG unit 502 components, for example to the pulse generator 504.
[0262] Reference is now made to
[0263] According to some exemplary embodiments, CRT is delivered at block 602. In some embodiments, the control circuitry 512 of the IPG unit 502 signals the pulse generator 504 to generate an electric field with parameter values selected for CRT. In some embodiments, the generated CRT electric field is delivered through at least one electrode, for example CRT electrode 508 to the heart.
[0264] According to some exemplary embodiments, an effect of the CRT, for example an effect of the CRT electric field is measured at block 604. In some embodiments, the control circuitry 512 measures the CRT effect based on signals received from the at least one heart sensor 520 and/or the at least body sensor 518. Optionally, the contro, circuitry 512 measured the CRT effect using at least one algorithm stored in the memory 514. In some embodiments, the CRT effect is measured by at least one external device located outside the body, for example an imaging device. In some embodiments, the results of the external device analysis are transmitted to the IPG unit 502 via the communication circuitry 524.
[0265] According to some exemplary embodiments, the control circuitry 512 determines that the measured CRT effect is not a desired effect, at block 606. In some embodiments, the control circuitry 512 determines that the measured CRT effect is not a desired effect by determining a relation between the measured CRT effect and at least one reference, for example a reference stored in the memory 514. In some embodiments, the control circuitry 512 determines that the measured CRT effect is not a desired effect using at least one algorithm or at least one lookup table stored in the memory 514.
[0266] According to some exemplary embodiments, the control circuitry 512 generates a score for the delivered CRT based on the measured CRT effect. In some embodiments, the control circuitry 512 determines that the CRT effect is not a desired effect based on the generated score, for example by determining a relation between the generated score and at least one reference value or a reference indication stored in the memory 514.
[0267] According to some exemplary embodiments, if the CRT effect is not a desired effect, then a cardiac contractility modulation protocol is selected at block 608. In some embodiments, the control circuitry 512 selects a cardiac contractility modulation protocol at block 608, for example a cardiac contractility modulation protocol stored in the memory 514. In some embodiments, the cardiac contractility modulation protocol is selected according to the measurements performed at block 604, according to the CRT treatment effect, and/or according to a clinical condition or physiolofical condition of the heart. In some embodiments, the cardiac contractility modulation protocol comprises at least one of parameter values of an electric field configured for cardiac contractility modulation therapy, at least one activation parameter of the pulse generator 504 and/or information regarding electrodes that can be used to deliver the cardiac contractility modulation electric field, for example electrodes position.
[0268] According to some exemplary embodiments, values of at least one parameter of the cardiac contractility modulation therapy are adjusted at block 610. In some embodiments, the at least one parameter comprises cardiac contractility modulation electric field parameter, and or a parameter of the cardiac contractility modulation protocol.
[0269] According to some exemplary embodiments, an electrodes configuration is selected, for example by the control circuitry 512, at block 612. In some embodiments, an electrodes configuration comprises a set of two or more electrodes positioned for delivery of the cardiac contractility modulation therapy out of a plurality of electrodes connected to the IPG unit, are selected at block 612. In some embodiments, at least one electrode out of two or more electrodes connected to the IPG unit, is selected for delivery of cardiac contractility modulation, for example based on the electrode location, electrode characteristics, and/or based on measurements of the CRT effect or other measurements of the clinical and physiological condition of the heart.
[0270] According to some exemplary embodiments, cardiac contractility modulation therapy is delivered at block 614. In some embodiments, cardiac contractility modulation therapy is delivered by signaling the pulse generator 504 to generate an electric field with parameter values selected for cardiac contractility modulation therapy, and/or to deliver the generated electric field through one or more of the electrodes selected at block 612. In some embodiments, the control circuitry 512 is configured to signal the pulse generator 504 to generate and deliver the cardiac contractility modulation electric field in synchronization with heart activity, for example in synchronization with contraction of the heart, and/or in synchronization with a depolarization state of at least one anatomical region of the heart. In some embodiments, the control circuitry 512 controls the timing of electric field generation and/or delivery based on signals received from one or more sensors measuring heart activity, for example heart sensor 520 shown in
[0271] According to some exemplary embodiments, an effect of the cardiac contractility modulation therapy on the heart is evaluated at block 616. In some embodiments, the effect of the cardiac contractility modulation therapy is evaluated based on signals received from at least one sensor, for example heart sensor 520. Alternatively, the effect of the cardiac contractility modulation therapy is evaluated based on measurements performed by at least one measurement device located outside the heart or outside the body. In some embodiments, the evaluation results or indications thereof are transmitted to the IPG unit 502, for example via the communication circuitry 524.
[0272] According to some exemplary embodiments, based on the results of the cardiac contractility modulation therapy evaluation performed at block 616, a different cardiac contractility modulation therapy protocol is optionally selected at block 618. Alternatively or additionally, based on the cardiac contractility modulation therapy evaluation results, values of at least one cardiac contractility modulation therapy parameter are optionally adjusted at block 610. Alternatively or additionally, based on the cardiac contractility modulation therapy evaluation results, at least one different electrode for delivery of the cardiac contractility modulation electric field is optionally selected or a different set of electrodes is optionally selected, at block 612.
[0273] According to some exemplary embodiments, instead of delivery of cardiac contractility modulation, a synchronization between CRT and cardiac contractility modulation therapy is performed at block 620. In some embodiments, the synchronization comprises timing synchronization between the delivery of an electric field with parameter values selected for CRT and delivery of an electric field with parameter values selected for cardiac contractility modulation therapy. Alternatively or additionally, the synchronization comprises synchronizing one or both CRT and cardiac contractility modulation therapy with heart activity, for example with the contraction of one or more of the heart compartments including left atrium, left ventricle, right atrium and right ventricle, and/or with the propagation of electric signals through the tissue of the heart. In some embodiments, the synchronization is performed by the control circuitry 512, optionally using at least one synchronization algorithm, at least one lookup table including one or more synchronization indications, stored in the memory 514.
[0274] According to some exemplary embodiments, CRT and cardiac contractility modulation therapy are delivered at block 622. In some embodiments, the control circuitry 512 signals the pulse generator 504 to generate a CRT electric field and a cardiac contractility modulation electric field, and/or to deliver them through at least one electrode to the heart tissue, according to the synchronization performed at block 620.
[0275] According to some exemplary embodiments, the effect of the dual treatment including CRT and cardiac contractility modulation therapy is evaluated at block 624. In some embodiments, the effect of the delivered CRT and cardiac contractility modulation therapy on the heart, for example on cardiac output and/or heart contractility, is evaluated at block 624. In some embodiments, the effect of the delivered CRT and cardiac contractility modulation therapy is evaluated based on signals received from at least one sensor connected to the IPG unit 502 and/or based on signals from at least one sensor or at least one device located outside the body, for example as described at blocks 604 and 616. In some embodiments, the control circuitry 512 performs the evaluation, for example automatically, based on information from at least one sensor connected to the IPG unit 502. Alternatively, the control circuitry 512 receives the evaluation results via the communication circuitry 524.
[0276] According to some exemplary embodiments, the effect of the delivered CRT and cardiac contractility modulation therapy is evaluated at block 624 at least 1 week, for example at least 1 month, at least 3 months, at least 6 months or any shorter or longer time period, following the treatment initiation. In some embodiments, the effect of the delivered CRT and cardiac contractility modulation comprises an effect on at least one of, ejection fraction, heart contractility, intracardiac pressure, intra cardiac pressure gradient over a selected time period, NYHA class score, Peak VO2 and 6 minute walk score.
[0277] According to some exemplary embodiments, if the evaluation results indicate that delivery of CRT does not result with a desired effect and/or that delivery of cardiac contractility modulation therapy is sufficient to reach a desired effect, CRT is stopped at block 625. In some embodiments, the control circuitry 512 signals the pulse generator to stop the generation of a CRT electric field, or stops signals to the pulse generator 504 to generate the CRT electric field, based on the evaluation results. Optionally, an indication signal is transmitted to an external device via the communication circuitry 524 if CRT is stopped.
[0278] According to some exemplary embodiments, values of at least one CRT parameter are optionally modified at block 626, for example by the control circuitry 512. In some embodiments, the values of the CRT parameter are modified based on the results of the evaluation performed at block 624. In some embodiments, synchronization between the delivered CRT and cardiac contractility modulation therapy is modified at block 626. Alternatively, a different CRT protocol is optionally selected.
[0279] According to some exemplary embodiments, a different cardiac contractility modulation protocol is optionally selected at block 628, for example by the control circuitry 512. In some embodiments, the different cardiac contractility modulation protocol is selected based on the results of the evaluation performed at block 624. Alternatively, values of at least one cardiac contractility modulation parameter are optionally adjusted at block 610, based on the results of the evaluation performed at block 628.
[0280] The terms “comprises”, “comprising”, “includes”, “including”, “has”, “having” and their conjugates mean “including but not limited to”.
[0281] The term “consisting of” means “including and limited to”.
[0282] The term “consisting essentially of” means that the composition, method or structure may include additional ingredients, steps and/or parts, but only if the additional ingredients, steps and/or parts do not materially alter the basic and novel characteristics of the claimed composition, method or structure.
[0283] As used herein, the singular forms “a”, “an” and “the” include plural references unless the context clearly dictates otherwise.
[0284] Throughout this application, embodiments of this invention may be presented with reference to a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention. Accordingly, the description of a range should be considered to have specifically disclosed all the possible subranges as well as individual numerical values within that range. For example, description of a range such as “from 1 to 6” should be considered to have specifically disclosed subranges such as “from 1 to 3”, “from 1 to 4”, “from 1 to 5”, “from 2 to 4”, “from 2 to 6”, “from 3 to 6”, etc.; as well as individual numbers within that range, for example, 1, 2, 3, 4, 5, and 6. This applies regardless of the breadth of the range.
[0285] Whenever a numerical range is indicated herein (for example “10-15”, “10 to 15”, or any pair of numbers linked by these another such range indication), it is meant to include any number (fractional or integral) within the indicated range limits, including the range limits, unless the context clearly dictates otherwise. The phrases “range/ranging/ranges between” a first indicate number and a second indicate number and “range/ranging/ranges from” a first indicate number “to”, “up to”, “until” or “through” (or another such range-indicating term) a second indicate number are used herein interchangeably and are meant to include the first and second indicated numbers and all the fractional and integral numbers therebetween.
[0286] Unless otherwise indicated, numbers used herein and any number ranges based thereon are approximations within the accuracy of reasonable measurement and rounding errors as understood by persons skilled in the art.
[0287] It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable subcombination or as suitable in any other described embodiment of the invention. Certain features described in the context of various embodiments are not to be considered essential features of those embodiments, unless the embodiment is inoperative without those elements.
[0288] Although the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications and variations that fall within the spirit and broad scope of the appended claims.
[0289] All publications, patents and patent applications mentioned in this specification are herein incorporated in their entirety by reference into the specification, to the same extent as if each individual publication, patent or patent application was specifically and individually indicated to be incorporated herein by reference. In addition, citation or identification of any reference in this application shall not be construed as an admission that such reference is available as prior art to the present invention. To the extent that section headings are used, they should not be construed as necessarily limiting. In addition, any priority document(s) of this application is/are hereby incorporated herein by reference in its/their entirety.