H-bridge circuit for generating a high-energy biphasic waveform in an external defibrillator
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United States of America Patent
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Nov 5, 2002
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app pub date -
Nov 3, 2000
filing date -
Mar 5, 1997
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Abstract
An external defibrillator with an output circuit having four legs arrayed in the form of an 'H' (an 'H-bridge') is disclosed. The output circuit is designed to be able to conduct a range of defibrillation pulse energies, from below 50 joules to above 200 joules. Each leg of the output circuit contains a solid-state switch. By selectively switching on pairs of switches in the H-bridge, a biphasic defibrillation pulse may be applied to a patient. The switches in three of the legs of the H-bridge output circuit are preferably silicon controlled rectifiers (SCRs). Gate drive circuits are coupled to the SCRs to bias the SCRs with a voltage that allows the SCRs to remain turned-on even when conducting low current. The switch in the fourth leg is preferably a pair of insulated gate bipolar transistors (IGBTs) coupled in series. A gate drive circuit is coupled to the gate of the IGBTs to provide a slow turn-on and a fast turn-off of the IGBTs. The gate drive circuit also biases the IGBTs with a sufficient voltage to allow the IGBTs to withstand a shorted discharge of the external defibrillator through the output circuit. The circuit also includes a protective component that has both inductive and resistive properties. An internal energy dump may be performed by biasing on two legs on the same side of the H-bridge output circuit, thus eliminating the need for a separate energy dump circuit. Methods for testing the H-bridge and verifying its integrity are also disclosed.
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- 15 United States
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Patent Owner(s)
- PHYSIO-CONTROL, INC.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Borschowa, Lawrence A | Kirkland, WA | 20 | 545 |
Nova, Richard C | Kirkland, WA | 125 | 5788 |
Sullivan, Joseph L | Kirkland, WA | 194 | 3063 |
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Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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