Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1992-11-19
1994-04-12
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 1368
Patent
active
053016696
ABSTRACT:
A system and method for preventing atrial competition during sensor-driven operation of a dual-chamber pacemaker includes means for sensing atrial activity during an atrial refractory period. Atrial competition is avoided by either: (1) generating an atrial competition prevention (ACP) interval upon the detection of any atrial activity during the relative refractory portion of an atrial refractory period, and preventing any atrial stimulation pulses from being generated for the duration of such ACP interval; or (2) shortening the atrial refractory period in the event that the sensor-driven rate of the pacemaker begins to approach a rate that might place atrial stimulation pulses near the end of the unshortened atrial refractory period. Further, the invention includes features that allow monitoring of the intrinsic atrial rate to determine if such is much greater than the sensor-driven rate, and, if so: (1) reducing the maximum tracking rate of the pacemaker, and/or (2) switching the operating mode of the pacemaker from a dual-chamber sensor-driven mode to an single-chamber sensor-driven mode.
REFERENCES:
patent: 4554921 (1985-11-01), Boute et al.
patent: 4624260 (1986-11-01), Baker, Jr. et al.
patent: 4788980 (1988-12-01), Mann et al.
patent: 4856523 (1989-08-01), Sholder et al.
patent: 4890617 (1990-01-01), Markowitz et al.
Gold Bryant R.
Kamm William E.
Romano Malcolm J.
Schaetzle Kennedy J.
Siemens Pacesetter, Inc.
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