System and method for providing tachyarrhythmia therapy by implantable device in presence of system faults
First Claim
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1. A system for providing tachyarrhythmia therapy in the presence of a system fault, comprising:
- a ventricular sensing circuit;
a shock pulse generator;
a primary controller for controlling the operation of the shock pulse generator;
fault monitoring circuitry;
a safety core defibrillator which is configured to be activated upon detection of a system fault which initiates a system reset and halts the primary controller;
wherein the safety core defibrillator is a hardware-based logic circuit which measures the intervals between successive ventricular senses and causes the shock pulse generator to deliver a shock pulse if the ventricular rate is above a specified threshold; and
,wherein the safety core defibrillator is configured to be automatically disabled in the event of charge faults during operation in order to prevent therapy retries when the shock pulse output circuits has been damaged or in the event that the battery capacity is insufficient to delivery therapy.
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Abstract
A system and method is disclosed by which an implantable cardiac device may deliver tachyarrhythmia therapy in the event of a system fault. A hardware-based safety core provides the logic circuitry for detecting tachyarrhythmias and delivering shock therapy in the event of a fault which disables operation of the device'"'"'s primary control circuitry. The safety core defibrillator eliminates common mode failure of the primary control circuits used in the primary defibrillator system. Failures in the primary controller memory or execution will activate the safety core defibrillator.
38 Citations
19 Claims
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1. A system for providing tachyarrhythmia therapy in the presence of a system fault, comprising:
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a ventricular sensing circuit; a shock pulse generator; a primary controller for controlling the operation of the shock pulse generator; fault monitoring circuitry; a safety core defibrillator which is configured to be activated upon detection of a system fault which initiates a system reset and halts the primary controller; wherein the safety core defibrillator is a hardware-based logic circuit which measures the intervals between successive ventricular senses and causes the shock pulse generator to deliver a shock pulse if the ventricular rate is above a specified threshold; and
,wherein the safety core defibrillator is configured to be automatically disabled in the event of charge faults during operation in order to prevent therapy retries when the shock pulse output circuits has been damaged or in the event that the battery capacity is insufficient to delivery therapy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system for providing tachyarrhythmia therapy in the presence of a system fault, comprising:
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a ventricular sensing circuit; a shock pulse generator; a primary controller for controlling the operation of the shock pulse generator; fault monitoring circuitry; a safety core defibrillator which is activated upon detection of a system fault which initiates a system reset and halts the primary controller; wherein the safety core defibrillator is a hardware-based logic circuit which measures the intervals between successive ventricular senses and causes the shock pulse generator to deliver a shock pulse if the ventricular rate is above a specified threshold; and
,a non-volatile register to provide a priority disable for the safety core defibrillator.
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19. A system for providing tachyarrhythmia therapy in the presence of a system fault, comprising:
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a ventricular sensing circuit; a shock pulse generator; a primary controller for controlling the operation of the shock pulse generator; fault monitoring circuitry; a safety core defibrillator which is activated upon detection of a system fault which initiates a system reset and halts the primary controller; wherein the safety core defibrillator is a hardware-based logic circuit which measures the intervals between successive ventricular senses and causes the shock pulse generator to deliver a shock pulse if the ventricular rate is above a specified threshold; and
,a magnetic switch and wherein, when a magnet is detected by actuation of the magnetic switch, therapy delivery by the safety core defibrillator is immediately inhibited.
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Specification