发明名称 |
H-bridge circuit for generating a high-energy biphasic waveform in an external defibrillator |
摘要 |
An external defibrillator (8) with an output circuit (14) having four legs arrayed in the form of an "H" (an "H-bridge") is disclosed. Each leg of the output circuit contains a solid-state switch (31, 32, 33, 34). 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 (51, 53, 54) 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 (52) 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 (52) 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.
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申请公布号 |
US5824017(A) |
申请公布日期 |
1998.10.20 |
申请号 |
US19970811833 |
申请日期 |
1997.03.05 |
申请人 |
PHYSIO-CONTROL CORPORATION |
发明人 |
SULLIVAN, JOSEPH L.;BORSCHOWA, LAWRENCE A.;NOVA, RICHARD C. |
分类号 |
A61N1/39;(IPC1-7):A61N1/39 |
主分类号 |
A61N1/39 |
代理机构 |
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