In an example, an apparatus is described that includes an implantable housing, a heart signal sensing circuit configured to sense intrinsic electrical heart signals, a ventricular tachyarrhythmia (VT) detector circuit, operatively coupled to the heart signal sensing circuit, the detector circuit operable to detect a VT based on the sensed heart signals, a processor configured to control delivery of an anti-tachyarrhythmia pacing (ATP) therapy based on the detected VT, and an energy delivery circuit configured to deliver the ATP therapy in response to the detected VT, wherein the apparatus does not include a shock circuit capable of delivering a therapeutically-effective cardioverting or defibrillating shock.

In an example, an apparatus is described that includes an implantable housing, a heart signal sensing circuit configured to sense intrinsic electrical heart signals, a ventricular tachyarrhythmia (VT) detector circuit, operatively coupled to the heart signal sensing circuit, the detector circuit operable to detect a VT based on the sensed heart signals, a processor configured to control delivery of an anti-tachyarrhythmia pacing (ATP) therapy based on the detected VT, and an energy delivery circuit configured to deliver the ATP therapy in response to the detected VT, wherein the apparatus does not include a shock circuit capable of delivering a therapeutically-effective cardioverting or defibrillating shock.

The present disclosure is directed to a system and method for measuring impedance across a plurality of electrodes and assessing proximity or contact between electrodes of a medical device and patient tissue. In one embodiment, contact is assessed individual electrodes and cardiac tissue using bipolar electrode complex impedance measurements. Initially, baseline impedance values are established for each of the individual electrodes based on the responses of the electrodes to the applied drive signals. After establishing the baseline impedance values a series of subsequent impedance values are measured for each electrode. For each electrode, each subsequent impedance value may be compared to a previous baseline impedance value for that electrode. If a subsequent impedance value is less than the baseline impedance value for a given electrode, the baseline impedance value may be reset to the subsequent impedance value. Such systems and method are particularly applicable to medical devices having numerous electrodes.

The present disclosure is directed to merging data acquired from differently configured catheters on a common map. In use, physical characteristics of catheters influence recorded electrical signals/responses such that differently configured catheters (e.g., different electrode sizes, shapes, materials, spacings, etc.) may record different responses to measurements taken at the same location in response to the same excitation signal. To allow merging of data from differently configured catheters in a common map, the present disclosure applies a corrective coefficient or transfer function to the recorded electrical signals of one or both catheters to counter-balance variable influences of catheter specific characteristics on recorded signals.

Computer implemented methods and systems are provided that comprise, under control of one or more processors of a medical device, where the one or more processors are configured with specific executable instructions. The methods and systems obtain motion data indicative of at least one of a posture or a respiration cycle; obtain cardiac activity (CA) signals for a series of beats; identify whether a characteristic of interest (COI) from at least a first segment of the CA signals exceeds a COI limit; analyze the motion data to determine whether at least one of the posture or respiration cycle at least in part caused the COI to exceed the COI limit. Based on the analyzing operation, the methods and systems automatically adjust a CA sensing parameter utilized by the medical device to detect R-waves in subsequent CA signals; and detect an arrhythmia based on a presence or absence of one or more of the R-waves in at least a second segment of the CA signals.

Devices, systems, and methods of the present disclosure are directed to generating three-dimensional surface representations of an anatomic structure such as a heart cavity. More specifically, a three-dimensional surface representation of the anatomic structure is constrained relative to one or more anchor portions corresponding to received input regarding the location of anatomic features of the anatomic structure. The resulting three-dimensional surface representation includes salient features of the anatomic structure and, therefore, can be useful as visualization tool during any of various different medical procedures, including, for example, cardiac ablation.

An implantable medical device, battery and method include memory configured to store program instructions. At least one of circuitry or a processor are configured to execute the program instructions in connection with at least one of monitoring a biological signal or administering a therapy. The device includes a battery comprising a cell stack that includes an anode, a cathode, and one or more separator layers electrically insulating the anode from the cathode. The device includes a case having a feedthrough port and a feedthrough assembly disposed in the feedthrough port. The feedthrough assembly includes a ferrule having a lumen. An inner conductor is disposed within the lumen of the ferrule. The inner conductor is formed from a material having a first composition and a first coefficient of thermal expansion (CTE). An insulating core is disposed within the lumen of the ferrule and separates the inner conductor from the ferrule. The insulating core is formed from a material having a second composition and a second CTE. The first CTE of the inner conductor is equal to or greater than the second CTE of the insulating core and the first and second compositions are molecularly bonded with one another to form a hermetic seal between the inner conductor and the insulating core.

An implantable medical device, battery and method include memory configured to store program instructions. At least one of circuitry or a processor are configured to execute the program instructions in connection with at least one of monitoring a biological signal or administering a therapy. The device includes a battery comprising a cell stack that includes an anode, a cathode, and one or more separator layers electrically insulating the anode from the cathode. The device includes a case having a feedthrough port and a feedthrough assembly disposed in the feedthrough port. The feedthrough assembly includes a ferrule having a lumen. An inner conductor is disposed within the lumen of the ferrule. The inner conductor is formed from a material having a first composition and a first coefficient of thermal expansion (CTE). An insulating core is disposed within the lumen of the ferrule and separates the inner conductor from the ferrule. The insulating core is formed from a material having a second composition and a second CTE. The first CTE of the inner conductor is equal to or greater than the second CTE of the insulating core and the first and second compositions are molecularly bonded with one another to form a hermetic seal between the inner conductor and the insulating core.

The invention relates to a measuring probe for epicardial ECG monitoring comprising the measuring element (2) for measuring an electric signal from a heart and the connecting element (3) arranged to output the measured heart signal, the measuring element (2) being electrically connected with the connecting element (3). The measuring element (2) and the connecting element (3) are layered elements. The invention relates also to a measuring system for epicardial ECG monitoring comprising the probe (1) connected by the signal cable (5) with a display device.

The invention relates to a measuring probe for epicardial ECG monitoring comprising the measuring element (2) for measuring an electric signal from a heart and the connecting element (3) arranged to output the measured heart signal, the measuring element (2) being electrically connected with the connecting element (3). The measuring element (2) and the connecting element (3) are layered elements. The invention relates also to a measuring system for epicardial ECG monitoring comprising the probe (1) connected by the signal cable (5) with a display device.