Lead current measurement circuit

Details Lead current measurement circuit Lead current measurement circuit

1990-11-29

1992-08-11

Kamm, William E.

Surgery

Truss

Pad

A61N 108

Patent

active

051370212

ABSTRACT:
An apparatus for and method of measuring the current which flows through a cardiac pacing lead to artificially stimulate contractions of the myocardium. This current measurement is useful for estimating battery life and monitoring proper operation of the pacing lead and the implantable pulse generator.
The measurement is accomplished by carefully controlling the gain of the output amplifier and timing the rate of charge and discharge of the output capacitor. The average pacing current can be determined from the relative charge and discharge times given that the other circuit component values are known and controlled.

REFERENCES:
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patent: 4332256 (1982-06-01), Brownlee et al.
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patent: 4364396 (1982-12-01), Barthel
patent: 4606350 (1986-08-01), Frost
patent: 4899750 (1990-02-01), Ekwall
patent: 4949720 (1990-08-01), Thompson
"Atrial Pacing: Efficacy and Safety", Pace, vol. 12, Jul. 1989, Part 1, pp. 1049-1054.

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