Protection against electromagnetic perturbations of external ori

Details Protection against electromagnetic perturbations of external ori Protection against electromagnetic perturbations of external ori

1995-12-22

1997-07-22

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

607 63, A61N 137

Patent

active

056499655

ABSTRACT:
An active implantable medical device, particularly a cardiac pacemaker or defibrillator, having a protection circuit that is effective against electromagnetic perturbations of external origin. The active implantable device is characterized in that at least all active components of the protection circuit (58, 60, 94, 98) are integrated components in a monolithically integrated microchip (16) including a control signal and circuits to commute selectively signals collected by external electrodes to the device for processing. In particular, the commutation circuits comprise static switches (24, 24', 28, 28', 38, 38', 40, 40', 44, 44', 46, 46', 50, 50', 54), and the control signal is a control voltage (VSUB, VCC) that is greater than the voltage (VPILE) of the battery of the device. The device delivers control logic signals (VDD, VSS) that are less than the battery voltage, and the protection circuit includes a voltage translator circuit (58) to raise, in absolute value, the logic control signal level to a value compatible with the static switches, control voltages and greater than the nominal level of parasitic voltages resulting from electromagnetic perturbations that are susceptible to appear on the static switch connection.

REFERENCES:
patent: 4363324 (1982-12-01), Kusserow
patent: 4379459 (1983-04-01), Stein
patent: 4739437 (1988-04-01), Morgan
patent: 4745923 (1988-05-01), Winstrom
patent: 5170806 (1992-12-01), Colen

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