H-bridge with sensing circuit
First Claim
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1. An electrical circuit for an implantable cardioverter/defibrillator comprising:
- power storage means connected to a battery;
switching means for controlling the delivery of defibrillation pulse therapy from the power storage means to a patient; and
sensing means for sensing a patient'"'"'s heart signal wherein interference with the sensing means is avoided by sequencing the switching means to remove residual voltage across the patient that results from the defibrillation pulse therapy;
wherein the switching means is arranged in an H-bridge output circuit consisting of first and second high side switches, and first and second low side switches, the H-bridge switches configured to produce biphasic defibrillation pulses, wherein the interference is removed by simultaneously closing the first and second low side switches.
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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
18 Claims
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1. An electrical circuit for an implantable cardioverter/defibrillator comprising:
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power storage means connected to a battery; switching means for controlling the delivery of defibrillation pulse therapy from the power storage means to a patient; and sensing means for sensing a patient'"'"'s heart signal wherein interference with the sensing means is avoided by sequencing the switching means to remove residual voltage across the patient that results from the defibrillation pulse therapy; wherein the switching means is arranged in an H-bridge output circuit consisting of first and second high side switches, and first and second low side switches, the H-bridge switches configured to produce biphasic defibrillation pulses, wherein the interference is removed by simultaneously closing the first and second low side switches. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of operating an H-bridge circuit for delivery of cardiac therapy to a patient from an implanted medical device, the H-bridge circuit including a first high side switch and a first low side switch defining a first node therebetween for coupling to a first electrode for therapy delivery, and a second high side switch and a second low side switch defining a second node for coupling to a second electrode for therapy delivery, the method comprising, when the implanted medical device is ready to deliver therapy:
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closing the first high side and the second low side switches to deliver electrical therapy of a first polarity; and closing the first and second low side switches to drain any residual voltage from the first and second electrodes. - View Dependent Claims (11, 12)
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13. A method of operating an implantable cardiac rhythm management device, the device including:
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first and second electrodes configured for implantable coupling to a patient; and an H-bridge circuit including first and second high side switches and first and second low side switches, the first high side switch and the first low side switch defining a first node therebetween for coupling to the first electrode, the second high side switch and the second low side switch defining a second node for coupling to the second electrode, the method comprising; closing the first high side switch and the second low side switch to deliver an electric pulse of a first polarity to the patient; and closing the first low side switch and the second low side switch to remove residual voltage from the first and second electrodes. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification