Pacing output coupling capacitor for automatic capture threshold

Details Pacing output coupling capacitor for automatic capture threshold Pacing output coupling capacitor for automatic capture threshold

1998-06-02

2000-03-28

Getzow, Scott M.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 137

Patent

active

060442964

ABSTRACT:
A method and apparatus for attenuating polarization voltages or "afterpotentials" which develop at the heart tissue/electrode interface following the delivery of a pacing stimulus to the heart tissue such that the evoked response of the heart may be accurately detected to determine whether each pacing stimulus resulted in heart capture or contraction, thereby facilitating improved tracking of the capture threshold and minimizing power consumption while assuring therapeutic efficacy. The conventional large capacitance coupling capacitor used to suppress DC components of the pacing spike has another, much lower capacitance capacitor connected in series with it. The lower capacitance capacitor may be operable in either the autothreshold mode or in the normal pacing mode such that its value can be selectively inserted in series with the larger capacitance coupling capacitor to effectively lower the overall capacitance of the coupling capacitor following delivery of the pacing stimulus.

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patent: 5486201 (1996-01-01), Canfield

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