Example occlusive implants are disclosed. An example occlusive implant includes an expandable framework configured to shift between a collapsed configuration and an expanded configuration, an occlusive member disposed along at least a portion of the expandable framework and a first collar attached to the expandable framework. The occlusive implant also includes a sensor housing coupled to the first collar, the sensor housing having a first end and a second end opposite the first end and a second collar slidably disposed along an outer surface of the sensor housing. Further, the second collar is coupled to the expandable framework via a spring. The occlusive implant also includes a sensor disposed along the second end of the sensor housing.

An implantable medical device performs a method that includes detecting a cardiac event interval that is greater than a P-wave oversensing threshold interval. In response to detecting the cardiac event interval greater than the P-wave oversensing threshold interval, the device determines the amplitude of the sensed cardiac signal and withholds restarting a pacing interval in response to the amplitude satisfying P-wave oversensing criteria. A pacing pulse may be generated in response to the pacing interval expiring without sensing an intrinsic cardiac electrical event that is not detected as a P-wave oversensing event.

The systems and methods described herein determine metrics of cardiac performance via a mechanical circulatory support device and use the cardiac performance to calibrate, control and deliver mechanical circulatory support for the heart. The systems include a controller configured to operate the device, receive inputs indicative of device operating conditions and hemodynamic parameters, and determine vascular performance, including vascular resistance and compliance, and native cardiac output. The systems and methods operate by using the mechanical circulatory support device (e.g., a heart pump) to introduce controlled perturbations of the vascular system and, in response, determine heart parameters such as stroke volume, vascular resistance and compliance, left ventricular end diastolic pressure, and ultimately determine native cardiac output.

Described herein is a system including a catheter, an optical circuit, a pulsed field ablation energy source, and a processing device. The catheter includes a proximal section, a distal section, and a shaft coupled between the proximal section and the distal section. The optical circuit is configured to transport light at least partially from the proximal section to the distal section and back. The pulsed field ablation energy source is coupled to the catheter and configured to transmit pulsed electrical signals to a tissue sample. The processing device is configured to analyze one or more optical signals received from the optical circuit to determine changes in polarization or phase retardation of light reflected or scattered by the tissue sample, and determine changes in a birefringence of the tissue sample based on the changes in polarization or phase retardation.

The present technology relates to interatrial shunting systems and methods. In some embodiments, the present technology includes a system for shunting blood between a left atrium and a right atrium of a patient. The system can include a shunt having a lumen extending therethrough. When the shunt is implanted in the patient, the lumen is configured to fluidly couple the left atrium and the right atrium. The system can also include a sensor configured to be implanted in the patient and operably coupled to the shunt. The sensor can be configured to measure one or more parameters corresponding to a physiological parameter of the patient and/or a characteristic of the shunt. The system can further include an external component wirelessly coupled to the sensor. The external component can be worn by or otherwise adhered to the patient.

In some examples, a computing apparatus may determine information corresponding to a data structure and indicating delays associated with an atrium lead, a left ventricle (LV) lead, and a right ventricle (RV) lead based on one or more input variables. The computing apparatus may determine a plurality of individualized characteristics based on the information corresponding to the data structure. The computing apparatus may receive, from the plurality of measurement electrodes, a plurality of second sets of electrical measurements indicating second electrical signals applied to the patient's heart based on the plurality of individualized characteristics. The computing apparatus may determine cardiac resynchronization index (CRI) values using a first set of electrical measurements (e.g., native measurements) and the plurality of second sets of electrical measurements. The computing apparatus may generate a graphical representation based on a populated data structure and cause display of the graphical representation.

A medical device is configured to sense an acceleration signal and determine at least one frequency metric from the acceleration signal that is correlated to a frequency of oscillations of the acceleration signal. The medial device is configured to determine that the at least one frequency metric meets atrial tachyarrhythmia criteria and detect an atrial tachyarrhythmia in response to at least the frequency metric meeting the atrial tachyarrhythmia criteria.

Provided are an MLA-OCT imaging catheter (3), a calibration method of the MLA-OCT imaging catheter, an MLA-OCT imaging system and an imaging method thereof. The MLA-OCT imaging catheter (3) comprises an inner tube (5), an outer tube (4) and a multi-core catheter connector (6), wherein the inner tube (5) comprises an optical fiber bundle (21) and a microlens array (7). In the MLA-OCT imaging system, a light source (14) is divided into a sample light and a reference light by an interferometer (15), wherein the sample light enters a signal arm to reach human tissue, while the reference light enters a reference arm to reach an optical delay line; the light returned from said two locations is respectively a first optical signal and a second optical signal, and the reference arm is provided with an optical delay line device. The MLA-OCT imaging method includes: adjusting the position of an optical delay line by a data processing device according to the signal-to-noise ratio of the interference signal until the signal-to-noise ratio is the highest, at this time the value of the delay time for the optical delay line of each optical fiber is the calibration value of the optical delay line which is stored in an MLA-OCT system; automatically setting the arm length of a reference arm by the MLA-OCT system based on the calibration value of the optical delay line, so as to detect the interference signal; and actuating an MLA-OCT imaging catheter (3) to move axially by a retracement controller to perform axial scanning, so as to generate a three-dimensional image of human tissue.

Various embodiments provide an apparatus, system method for treating neurological conditions by delivering solid form medication to the ventricles or other areas of the brain. Particular embodiments provide an apparatus and method for treating epilepsy and other neurological conditions by delivering solid form medication to ventricles in the brain wherein the medication is contained in a diffusion chamber so as to allow the medication to dissolve in the cerebrospinal fluid of the brain and then diffuse out of the diffusion chamber to be delivered to the ventricles and brain tissue. In one or more embodiments, portions of apparatus have sufficient flexibility to conform to the shape of the ventricles of the brain when advanced into them and/or to not cause deformation of the ventricle sufficient to cause a significant physiologic effect.

An electrophysiology system for mapping tissue includes a catheter having a plurality of electrodes. The system may be a catheter having a dense collection of small electrodes in fixed positions on its tip. The system may be an electrophysiology apparatus having a catheter, the catheter having a body with a proximal end and a distal end. At the distal end of the catheter body is a distal tip comprising a plurality of electrodes and/or coaxtrodes. A signal processor may be operably connected to the plurality of electrodes and/or coaxtrodes and can measure at least one electrophysiological parameter.