Implantable cardioverter-defibrillator with post-shock reset
First Claim
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1. An implantable cardiac stimulus device (ICSD) comprising:
- a first electrode;
a second electrode; and
operational circuitry coupled to the first and second electrodes at first and second nodes, respectively, and configured for providing cardiac stimuli using the first and second electrodes, the operational circuitry including an H-bridge circuit;
wherein the operational circuitry is programmed to;
determine whether cardiac stimulus is appropriate;
when appropriate, deliver cardiac stimulus using the first and second electrodes; and
short the first and second nodes together during a predetermined time period after delivery of the cardiac stimulus using switches internal to the H-bridge circuit.
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Abstract
In a cardioverter/defibrillator system, an electrical circuit includes an energy storage device, an output circuit for controlling delivery of pulse therapy from the energy storage device to a patient, and a sensing circuit coupled across the patient to sense the patient'"'"'s heart signal. The output circuit may be in the form of an H-bridge switching circuit wherein a pair of switches of the output circuit is simultaneously turned on to discharge residual voltage across the patient that remains after delivery of pulse therapy. Thus, interference with sensing of the patient'"'"'s heart signal is avoided.
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Citations
16 Claims
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1. An implantable cardiac stimulus device (ICSD) comprising:
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a first electrode; a second electrode; and operational circuitry coupled to the first and second electrodes at first and second nodes, respectively, and configured for providing cardiac stimuli using the first and second electrodes, the operational circuitry including an H-bridge circuit; wherein the operational circuitry is programmed to; determine whether cardiac stimulus is appropriate; when appropriate, deliver cardiac stimulus using the first and second electrodes; and short the first and second nodes together during a predetermined time period after delivery of the cardiac stimulus using switches internal to the H-bridge circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An implantable cardiac stimulus device (ICSD) comprising:
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electrode means for delivering cardiac stimulus to a patient from implanted locations; and operational circuitry coupled to the electrode means at first and second nodes, the operational circuitry configured for providing cardiac stimuli using the electrode means and comprising switches arranged in an H-bridge configuration including first and second high-side switches coupled respectively to the first and second nodes to selectively allow current to pass from a higher-voltage node to the first and second nodes, and first and second low-side switches coupled respectively to the first and second nodes; wherein the operational circuitry is programmed to; determine whether cardiac stimulus is appropriate; when cardiac stimulus is appropriate, deliver cardiac stimulus using the electrode means; and short the first and second nodes together during a predetermined time period after delivery of the cardiac stimulus by closing switches of the H-bridge configuration. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification