Method and apparatus for applying a rectilinear biphasic power waveform to a load
First Claim
1. A system to deliver therapeutic energy to a patient, the system comprising:
- a capacitor configured to store and release the therapeutic energy;
a converter circuit coupled to the capacitor and constructed to control a shape of a therapeutic waveform that arises upon release of the therapeutic energy from the capacitor, the converter circuit including;
an inductor,a current sensing network, coupled to the inductor, to sense a magnitude of current in the inductor,a switch coupled between the inductor and the current sensing network, andan operational amplifier configured to compare the magnitude of current in the inductor with a current profile,wherein the converter circuit is constructed to control a state of the switch based on the comparison; and
a switch network coupled to the converter circuit and constructed to apply the therapeutic energy released from the capacitor to the patient according to the controlled shape of the therapeutic waveform.
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Accused Products
Abstract
A system and method to deliver a therapeutic quantity of energy to a patient. The system includes a capacitor having a rated energy storage capacity substantially equal to the therapeutic quantity of energy, a boost converter coupled with the capacitor and constructed to release energy from the capacitor at a substantially constant current for a time interval, and an H-bridge circuit coupled with the boost converter and constructed to apply the substantially constant current in a biphasic voltage waveform to the patient. The method includes storing a quantity of energy substantially equal to the therapeutic quantity of energy in a capacitor, releasing the quantity of energy at a relatively constant current during a time interval using a boost converter coupled with the capacitor, and delivering a portion of the quantity energy in a direction to the patient using an H-bridge circuit coupled with the boost converter.
19 Citations
12 Claims
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1. A system to deliver therapeutic energy to a patient, the system comprising:
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a capacitor configured to store and release the therapeutic energy; a converter circuit coupled to the capacitor and constructed to control a shape of a therapeutic waveform that arises upon release of the therapeutic energy from the capacitor, the converter circuit including; an inductor, a current sensing network, coupled to the inductor, to sense a magnitude of current in the inductor, a switch coupled between the inductor and the current sensing network, and an operational amplifier configured to compare the magnitude of current in the inductor with a current profile, wherein the converter circuit is constructed to control a state of the switch based on the comparison; and a switch network coupled to the converter circuit and constructed to apply the therapeutic energy released from the capacitor to the patient according to the controlled shape of the therapeutic waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A defibrillator comprising:
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a capacitor configured to store and release therapeutic energy; a converter circuit coupled to the capacitor and constructed to control the shape of a defibrillating waveform that arises upon release of the therapeutic energy from the capacitor, the converter circuit including; an inductor, a current sensing network, coupled to the inductor, to sense a magnitude of current in the inductor, a switch coupled between the inductor and the current sensing network, an operational amplifier configured to compare the magnitude of current in the inductor with a current profile, and a diode, wherein the converter circuit is constructed to control a state of the switch based on the comparison; and an energy regulation network coupled to the converter circuit and constructed to apply the therapeutic energy released from the capacitor according to the controlled shape of the defibrillating waveform in at least one defibrillation impulse to a patient. - View Dependent Claims (10)
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11. A pacing device comprising:
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a capacitor configured to store and release therapeutic energy; a converter circuit coupled to the capacitor and constructed to control a shape of a pacing waveform that arises upon release of the therapeutic energy from the capacitor, the converter circuit including; an inductor, a current sensing network, coupled to the inductor, to sense a magnitude of current in the inductor, a switch coupled between the inductor and the current sensing network, an operational amplifier configured to compare the magnitude of current in the inductor with a current profile, and a diode, wherein the converter circuit is constructed to control a state of the switch based on the comparison; and an energy regulation network coupled to the converter circuit and constructed to apply the therapeutic energy released from the capacitor according to the controlled shape of the pacing waveform in at least one pacing impulse to a patient. - View Dependent Claims (12)
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Specification