Method and apparatus for controlling pacemaker during automatic

Details Method and apparatus for controlling pacemaker during automatic Method and apparatus for controlling pacemaker during automatic

1994-06-13

1996-01-02

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 137

Patent

active

054804140

ABSTRACT:
A cardiac pacemaker improves battery longevity by automatically providing optimized threshold amplitude and pulse width values. During capture verification and threshold searching, the pacemaker delivers a pacing pulse and a rapid, maximum amplitude backup pulse in case the pacing pulse fails to capture a patient's heart. Unlike the prior art, the backup pulse is delivered before a predefined Vulnerable Period (during which time pacing might lead to re-entrant tachycardia or fibrillation). This results in threshold searching which is quick, accurate and with smaller rate drops during loss of capture. In another aspect of the present invention, a diagnostic strength-duration curve is approximated by first setting the pulse width to a maximum value and determining the amplitude threshold (rheobase), and then by doubling the amplitude and determining the pulse width threshold (chronaxie).

REFERENCES:
patent: 3920024 (1975-11-01), Bowers
patent: 3949758 (1976-04-01), Jirak
patent: 4428378 (1984-01-01), Anderson
patent: 4485813 (1984-12-01), Anderson
patent: 4556063 (1985-12-01), Thompson
patent: 4708142 (1987-11-01), Decote
patent: 4729376 (1988-03-01), Decote
patent: 5127404 (1992-07-01), Wyborny
patent: 5154170 (1992-10-01), Bennett

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