System for delivering rounded low pain therapeutic electrical wa

Details System for delivering rounded low pain therapeutic electrical wa System for delivering rounded low pain therapeutic electrical wa

1998-04-22

1999-05-25

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

607 63, 128908, A61N 139

Patent

active

059066334

ABSTRACT:
A system for delivering low pain cardioversion shocks to the heart wherein the system provides a waveform to the heart that is biphasic and has rounded leading and trailing edges. The rounded leading and trailing edges are believed to decrease the discomfort experienced by the patient. In one embodiment, the circuit has a two capacitors connected in parallel with each other and with an H-bridge. The two capacitors are connected via a switch that can be closed so as to simultaneously charge one capacitor from the other while simultaneously applying voltage to the H-bridge. The circuit also includes a dump resistor that can be connected in parallel with the capacitors so as to increase the rounding of the trailing edges of the waveform. In another embodiment, controllable switches can also be included so as to be able to connect the capacitors in series and apply a sharp peak defibrillation waveform to the heart.

REFERENCES:
patent: 2771554 (1956-11-01), Grotzel
patent: 3602754 (1971-08-01), Jares et al.
patent: 4102348 (1978-07-01), Hihara et al.
patent: 5591209 (1997-01-01), Kroll
Sharma et al "A Reliable Microprocessor Based Defibrillator Analyzer", IEEE Transactions on Instrumentation & Measurement, vol. 1M-31, No. 1 pp. 28-31 copy in 6071005) Mar. 1982.

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