Implantable defibrillator output stage test circuit and method

Details Implantable defibrillator output stage test circuit and method Implantable defibrillator output stage test circuit and method

1993-12-22

1995-07-11

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 136

Patent

active

054316847

ABSTRACT:
A method and apparatus for testing the integrity of biphasic and monophasic defibrillator switches in an implantable defibrillator without delivering a shock to the patient. The test circuitry is integrated with and implantable with the defibrillator and provides for the testing of the defibrillator switches without shocking the patient by charging the capacitive defibrillation voltage source to a predetermined level and discharging it through a resistive network and shunting one of the switches to provide an alternate current path to ground, while isolating the test circuitry from the patient. Switch conditions are capable of ascertainment by measuring residual charge, i.e., voltage, on the capacitive voltage source at selected measurement times.

REFERENCES:
patent: 4164946 (1979-08-01), Langer
patent: 5111816 (1992-05-01), Pless et al.
patent: 5163428 (1992-11-01), Pless
patent: 5201865 (1993-04-01), Kuehn
patent: 5224475 (1993-07-01), Berg et al.
patent: 5275158 (1994-01-01), Lopin

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