Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1997-11-12
1999-10-19
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 2, 361 58, 361 59, A61N 108
Patent
active
059680830
ABSTRACT:
An active overload detection and protection circuit for protecting a host device (e.g., an implantable cardiac therapy device) from potential damage due to high voltage transients applied to an I/O node thereof. The protection circuit includes an I/O circuit coupled to the I/O node, the I/O circuit having low-impedance and high-impedance modes, a current overload detection circuit coupled to the I/O circuit which detects a current overload condition induced by a high voltage transient, and which generates an overload detect signal in response, and, a mode changing circuit which changes the mode of the I/O circuit from the low-impedance mode to the high-impedance mode in response to the overload detect signal. The protection circuit further includes a reset circuit which generates a reset signal a prescribed time after the overload detect signal is generated, wherein the mode changing circuit is responsive to the reset signal to change the mode of the I/O circuit. The current overload detection circuit includes circuitry which ensures that the overload detect signal is generated only when an overload current flowing through the I/O circuit is greater than a prescribed threshold level for at least a prescribed time period. The mode changing circuit includes logic circuitry which generates a mode change control signal only when both the overload detect signal and a first control signal are present.
REFERENCES:
patent: 4745923 (1988-05-01), Winstrom
patent: 5720767 (1998-02-01), Amely-Velez
patent: 5761019 (1998-06-01), Kroll
Archer Stephen T.
Ciciarelli Timothy E.
Kamm William E.
Mitchell Steven M.
Pacesetter Inc.
Schaetzle Kennedy J.
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