Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1997-02-19
1998-09-01
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 1378
Patent
active
058004726
ABSTRACT:
A multi-mode rate-responsive pacemaker provides an accurate recommended replacement time (RRT) indicator which provides for full rate response performance until RRT is indicated without any decrease in longevity due to a premature triggering of RRT during rate response. An RRT trigger signal is generated whenever the battery voltage falls below a prescribed RRT threshold voltage. In one embodiment, a sustained battery voltage (determined based, e.g., on a long-term average of the battery voltage) that is less than the RRT threshold voltage must be detected before the RRT trigger signal is generated. In another embodiment, two RRT threshold voltages are used rather than one. A normal RRT threshold voltage is used when the pacer is not operating in a rate-responsive mode, and a lower RRT threshold voltage is used when the pacer is operating in a rate-responsive mode. In yet another embodiment, when the pacemaker is operating in a rate-responsive mode, the RRT trigger signal is not generated until a time delay longer than a typical exercise duration has elapsed during which the battery voltage continuously remains below the RRT threshold.
REFERENCES:
patent: 4448197 (1984-05-01), Nappholz et al.
patent: 5031616 (1991-07-01), Mann et al.
patent: 5193538 (1993-03-01), Ekwall
patent: 5228439 (1993-07-01), Mann et al.
patent: 5620474 (1997-04-01), Koopman
Kamm William E.
Pacesetter Inc.
Schaetzle Kennedy J.
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