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 boost 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 boost 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 boost converter circuit is constructed to control a state of the switch based on the comparison; and
a current flow control circuit coupled to the boost converter circuit and comprising a plurality of control circuits configured to linearly control a current output from the current flow control circuit upon release of the therapeutic energy from the capacitor.
1 Assignment
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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.
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Citations
17 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 boost 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 boost 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 boost converter circuit is constructed to control a state of the switch based on the comparison; and a current flow control circuit coupled to the boost converter circuit and comprising a plurality of control circuits configured to linearly control a current output from the current flow control circuit upon release of the therapeutic energy from the capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification