System and method for providing bradycardia therapy by implantable device in presence of system faults
First Claim
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1. A system for providing bradycardia therapy in the presence of a system fault, comprising:
- a ventricular sensing circuit;
a pacing pulse generator;
a primary controller for controlling the operation of the pacing pulse generator in accordance with a programmed pacing mode;
fault monitoring circuitry;
a safety core pacemaker which is activated upon detection of a system fault which initiates a system reset and halts the primary controller;
wherein the safety core pacemaker is a hardware-based logic circuit which comprises an escape interval timer which upon expiration causes the pacing pulse generator to deliver a ventricular pacing pulse and which is reset by a ventricular pace or sense;
wherein the primary controller is configured to disable the safety core pacemaker when the primary controller successfully completes its reset sequence; and
,wherein the safety core pacemaker is configured to operate in parallel to the primary controller using an escape interval set to the maximum pacing interval that is allowed for the system when the safety core pacemaker is disabled by the primary controller.
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Abstract
A system and method is disclosed by which an implantable cardiac device may deliver bradycardia therapy in the event of a system fault. A hardware-based safety core provides the logic circuitry for delivering bradycardia therapy in the form of synchronous pacing in the event of a fault which disables operation of the device'"'"'s primary control circuitry. The safety core pacemaker eliminates common mode failure of the primary control circuits used in the primary pacing system. Failures in the primary controller memory or execution will activate the safety core pacemaker.
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Citations
19 Claims
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1. A system for providing bradycardia therapy in the presence of a system fault, comprising:
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a ventricular sensing circuit; a pacing pulse generator; a primary controller for controlling the operation of the pacing pulse generator in accordance with a programmed pacing mode; fault monitoring circuitry; a safety core pacemaker which is activated upon detection of a system fault which initiates a system reset and halts the primary controller; wherein the safety core pacemaker is a hardware-based logic circuit which comprises an escape interval timer which upon expiration causes the pacing pulse generator to deliver a ventricular pacing pulse and which is reset by a ventricular pace or sense; wherein the primary controller is configured to disable the safety core pacemaker when the primary controller successfully completes its reset sequence; and
,wherein the safety core pacemaker is configured to operate in parallel to the primary controller using an escape interval set to the maximum pacing interval that is allowed for the system when the safety core pacemaker is disabled by the primary controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for operating a cardiac pacemaker, comprising:
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controlling the operation of a pacing pulse generator in accordance with a programmed pacing mode using a primary controller; activating a safety core pacemaker upon detection of a system fault which initiates a system reset and halts the primary controller, wherein the safety core pacemaker is a hardware-based logic circuit which comprises an escape interval timer which upon expiration causes the pacing pulse generator to deliver a ventricular pacing pulse and which is reset by a ventricular pace or sense; disabling the safety core pacemaker when the primary controller successfully completes its reset sequence; and
,operating the safety core pacemaker in parallel to the primary controller using an escape interval set to the maximum pacing interval that is allowed for the system when the safety core pacemaker is disabled.
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Specification