Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Reexamination Certificate
2005-11-08
2005-11-08
Jastrzab, Jeffrey R. (Department: 3762)
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
C607S004000
Reexamination Certificate
active
06963773
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 SCR switches, while the fourth leg includes an IGBT switch. In one embodiment, a single power switch is utilized in each of the legs of the H-bridge output circuit, and are included in a single integrated module or package. The use of single semiconductor switches in an integrated surface mountable module or package simplifies the assembly and manufacturing of the defibrillator device. The use of a single IGBT in a leg of the H-bridge (as opposed to two or more IGBTs in series) also greatly simplifies the drive circuitry required to turn on and off the IGBT.
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Borschowa Lawrence A.
Nova Richard C.
Sullivan Joseph L.
Waltman Barry F.
Jastrzab Jeffrey R.
MedTronic Physio-Control Manufacturing Corp.
Redman Mary Y.
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