Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1991-11-15
1993-09-14
Cohen, Lee S.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 136
Patent
active
052439798
ABSTRACT:
A cardiac pacemaker of the type including a sensor responsive to the patient's metabolic demand for oxygenated blood and which varies the pacing rate in response to the output of the sensor. In the disclosed embodiment, a piezoelectric sensor bonded to the inside surface of the pacemaker's outer shield delivers a pulsatile sensor signal to activity circuitry, where the different peak values of the pulsatile signal correspond to different levels of patient activity. The activity circuit defines a plurality of sensor signal threshold levels. Rate control circuitry increases the pacing rate of the pacemaker by amounts corresponding to the threshold level exceeded by recent peak values of said pulsatile signal; peaks of said pulsatile signal which exceed only the lowest of the thresholds cause the smallest increase in the pacing rate, while sensor signals which exceed higher thresholds cause larger increases in the pacing rate. Several parameters, including upper and lower pacing rate limits and rate-response settings are selectable by means of an external programming device communicating with the pacemaker via radio-frequency telemetry.
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Stein Paul M.
Thompson David L.
Cohen Lee S.
Holmbo Dwight N.
Jastrzab Jeffrey R.
Medtronic Inc.
Patton Harold R.
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