H-bridge with sensing circuit
First Claim
1. An electrical circuit for a cardioverter-defibrillation system comprising:
- an energy storage device;
an output circuit coupled to the energy storage device, wherein the output circuit comprises switching means for controlling delivery of defibrillation pulses from the energy storage device to a patient; and
a sensing circuit coupled across the patient to sense a patient'"'"'s heart signal, wherein at least two of the switching means of the output circuit are simultaneously turned on to discharge residual voltage across the patient, thus avoiding interference with sensing of the patient'"'"'s heart signal.
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Accused Products
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 are 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
66 Claims
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1. An electrical circuit for a cardioverter-defibrillation system comprising:
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an energy storage device;
an output circuit coupled to the energy storage device, wherein the output circuit comprises switching means for controlling delivery of defibrillation pulses from the energy storage device to a patient; and
a sensing circuit coupled across the patient to sense a patient'"'"'s heart signal, wherein at least two of the switching means of the output circuit are simultaneously turned on to discharge residual voltage across the patient, thus avoiding interference with sensing of the patient'"'"'s heart signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An electrical circuit for a cardioverter/defibrillator comprising:
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a storage circuit connected to a power source;
an output circuit coupled to the storage circuit that controls delivery of defibrillation pulse therapy to a patient; and
a sensing circuit coupled to the output circuit across the patient such that the sensing circuit immediately recovers after delivery of pulse therapy by removal of residual voltage across the patient. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. An electrical circuit for a cardioverter/defibrillator comprising:
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power storage means connected to a power source;
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. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A method for defibrillating a patient using an implantable cardioverter/defibrillator comprising the steps of:
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sensing a heart signal;
sequencing switches of an output circuit to deliver pulse therapy to the patient based on the sensing of the heart signal;
after delivery of the pulse therapy to the patient, turning on at least two switches of the output circuit to discharge residual voltage across the patient that remains after delivery of the pulse therapy. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57)
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58. A method for sensing a heart signal of a patient and providing pulse therapy to the patient using a subcutaneous implantable cardioverter/defibrillator, the method comprising the steps of:
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providing an output circuit having switching means coupled to electrodes proximate to a patient'"'"'s heart;
providing a sensing circuit coupled across the patient for monitoring the heart signal of the patient;
sequencing the output circuit to deliver therapy pulses to the patient; and
when the therapy pulses are completed, turning on a pair of switching means of the output circuit at the same time effectively shorting voltage across the electrodes and discharging residual voltage across the patient, thus avoiding interference with immediate recovery of the sensing circuit and thus allowing proper observation of the heart signal. - View Dependent Claims (59, 60, 61, 62, 63, 64, 65, 66)
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Specification