Surgery – Truss – Pad
Patent
1987-10-08
1989-08-15
Jaworski, Francis
Surgery
Truss
Pad
A61N 100, H05G 000
Patent
active
048565237
ABSTRACT:
In a first embodiment, hysteresis is provided in a rate-responsive pacemaker to allow for natural AV synchrony when possible. In the absence of natural SA node signals, the heart is stimulated at a rate determined by the sensing of physiological need. When a natural heart signal is detected, the hysteresis is activated to extend the escape interval by a predetermined amount which is related to the sensed physiological need. The stimulating pulses are inhibited as long as normal heart activity is sensed. The extension of the escape interval under such conditions eliminates possible competition between normal activity and the paced stimulation. In a second embodiment automatic mode switching is provided in a dual chamber pacemaker to allow for more efficient operation at higher heart rates. When the heart rate (natural or paced) exceeds a prescribed level, such as 90 beats per minute, the pacemaker operates in a single chamber mode, such as VVI.
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Leckrone et al., "A Microprocessor-Based, Two-Chamber Physiologic Pacemaker," The Third Decade of Cardiac Pacing, pp. 167-188, Futura Publishing Co. (1982).
Knudson et al., "Hemodynamic Demand Pacing," The Third Decade of Cardiac Pacing, pp. 249-263, Futura Publishing (1982).
Florio Joseph J.
Mann Brian M.
Sholder Jason A.
Gold Bryant R.
Jaworski Francis
Manuel George
Miller Leslie S.
Siemens-Pacesetter, Inc.
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