Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1994-11-30
1996-10-08
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 18, A61N 1365
Patent
active
055627110
ABSTRACT:
A body-implantable rate-responsive cardiac pacemaker is provided with circuitry for sensing a plurality of physiologic parameters known to be indicative of a patient's metabolic demand for increased cardiac output. In one embodiment, a rate-responsive pacemaker is provided with an activity sensor for detecting the patient's level of physical activity, and is further provided with an impedance sensing circuit for detecting the patient's level of minute ventilation by monitoring cardiac impedance. A rate-response transfer function, implemented by the pacemaker's control circuitry, periodically computes a rate-responsive pacing rate as a function of the outputs from both physiologic sensing circuits. The pacemaker's pacing rate is variable within a rate range defined by predetermined (programmable) upper and lower limits. In the preferred embodiment, the influence of activity sensing and minute ventilation parameters varies in accordance with the current pacing rate. In particular, the influence of activity sensing in rate determination in accordance with the rate-response function is greater than that of minute ventilation, for slower pacing rates, while the influence of minute ventilation sensing dominates over that of activity sensing for higher pacing rates. Rate response operation of the disclosed system is recorded in the form of histogram data stored over a predetermined history time. The relative influence of the activity sensing and minute ventilation sensing on rate determination is periodically scaled or balanced based upon comparison of the histogram data with predetermined desired response data.
REFERENCES:
patent: 4374382 (1983-02-01), Markowitz
patent: 4476868 (1984-10-01), Thompson
patent: 4485813 (1984-12-01), Anderson
patent: 4527568 (1985-07-01), Rickards
patent: 4556063 (1985-12-01), Thompson
patent: 4688573 (1987-08-01), Alt
patent: 4702253 (1987-10-01), Nappholz
patent: 4719920 (1988-01-01), Alt
patent: 4721110 (1988-01-01), Lampadius
patent: 4722342 (1988-02-01), Amundson
patent: 4782836 (1988-11-01), Alt
patent: 4884576 (1989-12-01), Alt
patent: 4966146 (1990-10-01), Webb
patent: 4972834 (1990-11-01), Begemann
patent: 5052388 (1991-10-01), Sivula
patent: 5063927 (1991-11-01), Webb
patent: 5065759 (1991-11-01), Begemann
patent: 5101824 (1992-04-01), Lekholm
patent: 5127404 (1992-07-01), Wyborny
patent: 5154170 (1992-10-01), Bennett
patent: 5197467 (1993-03-01), Steinhaus et al.
patent: 5271395 (1993-12-01), Wahlstrand
patent: 5312453 (1994-05-01), Shelton
patent: 5330513 (1994-07-01), Nichols et al.
patent: 5376106 (1994-12-01), Stahmann et al.
patent: 5387229 (1995-02-01), Poore
patent: 5441524 (1995-08-01), Rueter et al.
Combs William J.
Kleckner Karen J.
Panken Eric J.
Schallhorn Richard S.
Wahlstrand John D.
Atlass Michael B.
Kamm William E.
Layno Carl H.
Medtronic Inc.
Patton Harold R.
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