Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1994-03-30
1996-01-02
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 9, A61N 136
Patent
active
054804418
ABSTRACT:
A rate-responsive pacemaker pulse generator and lead system that allows the rate at which the pacemaker delivers electrical stimulation pulses to the heart to be adjusted as needed in order to satisfy the body's physiological needs. The pulse generator and lead system include first and second electrodes coupled to a virtual load and monitoring circuit for monitoring the electrical energy provided through the virtual load in order to detect the magnitude of cardiac depolarization signals. The impedance of the virtual load is intentionally mismatched to the source impedance of the cardiac tissue in order to increase the peak-to-peak variation of the cardiac depolarization signals as a function of modulation of the tissue source by respiratory activity. The peak to peak modulation of the cardiac signals is processed to provide a pacing rate control signal.
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Bioelectric Amplifiers, Chapter 4, in: Joseph J. Carr and John M. Brown (eds) Introduction to Biomedical Equipment Tech., John Wiley & Sons: New York 1981 pp. 41-44.
Duthler Reed A.
Jastrzab Jeffrey R.
Kamm William E.
Medtronic Inc.
Patton Harold R.
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