Switched capacitor defibrillation circuit
First Claim
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1. An apparatus comprising:
- an H-bridge circuit adapted to be connected to a patient; and
a drive circuit connected to said H-bridge circuit and including a plurality of energy storage devices and a plurality of switches, the switches enabling each energy storage device to be charged to a common voltage and thereafter sequentially connected to supply a drive voltage to said H-bridge circuit.
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Abstract
A defibrillator circuit for generating a rectangular waveform across a patient from capacitively stored energy and employing a plurality of capacitors initially chargeable to a common voltage and thereafter sequentially switchable into parallel relation with one another so as to raise the voltage supplied to an H-bridge circuit from a point of decay back to said common voltage.
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Citations
27 Claims
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1. An apparatus comprising:
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an H-bridge circuit adapted to be connected to a patient; and
a drive circuit connected to said H-bridge circuit and including a plurality of energy storage devices and a plurality of switches, the switches enabling each energy storage device to be charged to a common voltage and thereafter sequentially connected to supply a drive voltage to said H-bridge circuit. - View Dependent Claims (2, 3, 4, 5, 6, 22, 25)
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7. The apparatus comprising:
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first and second switches adapted to be connected across a patient resistance and activatable when so connected to deliver a current to said patient in response to application of a voltage to said first and second switches; and
means including a plurality of capacitor means switchable into parallel relation with one another for applying an approximation of a rectangular voltage waveform to said first and second switches. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 23, 26)
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18. A method of generating a drive signal for use in delivering a defibrillating signal to a patient comprising the steps of:
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charging each of a plurality of capacitors to a common voltage;
applying the voltage on a first of said capacitors to create said drive signal; and
selectively connecting at least one of the remaining said plurality of capacitors in parallel with said first capacitor. - View Dependent Claims (19, 20, 21, 24, 27)
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Specification