Method and apparatus for applying rectilinear biphasic power waveform to a load
First Claim
1. A system to deliver a therapeutic quantity of energy to a patient load, the system comprising:
- a capacitor having a rated energy storage capacity;
a boost converter coupled with the capacitor and constructed to release energy from the capacitor during a time interval; and
an H-bridge circuit coupled with the boost converter and constructed to apply the energy released from the capacitor in a voltage waveform to the patient load, the H-bridge circuit including at least one driver circuit coupled with at least one switch, the at least one driver circuit constructed to receive a control signal and control a magnitude of current in the at least one switch based on the control signal, the at least one driver circuit including a first operational amplifier having a first input coupled with an output terminal of the at least one switch, a second input coupled with the output terminal of the at least one switch via a first resistance, and an output.
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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
19 Claims
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1. A system to deliver a therapeutic quantity of energy to a patient load, the system comprising:
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a capacitor having a rated energy storage capacity; a boost converter coupled with the capacitor and constructed to release energy from the capacitor during a time interval; and an H-bridge circuit coupled with the boost converter and constructed to apply the energy released from the capacitor in a voltage waveform to the patient load, the H-bridge circuit including at least one driver circuit coupled with at least one switch, the at least one driver circuit constructed to receive a control signal and control a magnitude of current in the at least one switch based on the control signal, the at least one driver circuit including a first operational amplifier having a first input coupled with an output terminal of the at least one switch, a second input coupled with the output terminal of the at least one switch via a first resistance, and an output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of delivering a therapeutic quantity of energy to a patient load, the method comprising:
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storing a quantity of energy in a capacitor; releasing the stored quantity of energy during a time interval using a boost converter coupled with the capacitor; measuring a magnitude of current in the at least one switch; receiving a control signal; determining a difference between the measured magnitude of current and the control signal; and controlling the magnitude of the current in the at least one switch based on the difference. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An H-bridge circuit to deliver a therapeutic quantity of energy to a patient load, the circuit comprising:
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a first switch having an input terminal coupled with a boost converter, a control terminal, and an output terminal coupled with the patient load; a second switch having an input terminal to couple with the patient load, a control terminal, and an output terminal; and a first drive circuit coupled with the first switch and a second drive circuit coupled with the second switch, each of the first drive circuit and the second drive circuit including; a first operational amplifier having a first input coupled with the output terminal of the respective switch, a second input coupled with the output terminal of the respective switch via a resistance, and an output; and a second operation amplifier having a first input to receive a control signal, a second input coupled with the output of the first operational amplifier, and an output coupled with the control terminal of the respective switch.
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Specification