A - Human Necessities – 61 – N
Patent
A - Human Necessities
61
N
326/1.1
A61N 1/37 (2006.01) A61B 5/00 (2006.01) H02H 9/00 (2006.01) H02H 9/02 (2006.01)
Patent
CA 1290024
ABSTRACT OF THE DISCLOSURE An electrical circuit is connected in series with a lead of an implantable heart pacemaker between the pacemaker and the heart to protect the pacemaker against high voltages and currents produced by defibril- lators and other sources. The electrical circuit has a sensing resistor arranged between two normally conduct- ing field effect transistors (FETs) all in electrical series with the pacemaker lead. When the voltage drop across the sansing resistor exceeds a predetermined positive or negative amplitude, a transistor becomes conductive and turns off the normal conduction channels of the FETs. An alternate, electrically conductive high-impedance path is switched in to limit the current flow to the pacemaker until the magnitude of the voltage across the sensing resistor drops to a safe level. The transistor then becomes non-conductive and the FETs become conductive re-establishing the normal low-impedance conduction path and effectively switching the alternate high-impendance path out of the circuit.
519307
Cassan Maclean
Intermedics Inc.
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