A - Human Necessities – 61 – N
Patent
A - Human Necessities
61
N
326/1.3
A61N 1/36 (2006.01) A61N 1/362 (2006.01) A61N 1/372 (2006.01)
Patent
CA 1273067
ABSTRACT OF THE DISCLOSURE An implantable microprocessor-controlled dual chamber heart pacemaker is programmed to control the timing of the pacing of the ventricle in response to high rate atrial signals. The microprocessor operates in conjunction with an atrial timer to detect atrial signals which occur at a rate in excess of a predefined atrial rate limit. The microprocessor paces the ventricle at a predefined desirable demand rate and inhibits pacing of the atrium in response to the high rate atrial activity. The microprocessor also controls the timing of an atrial refractory interval which includes an absolute refractory portion during which atrial signals are not detected and a relative refrac- tory portion during which atrial signals are detected but are not tracked. The combined absolute and relative atrial refractory portions insure that relatively high rate atrial signals are detected and spurious signals conducted from the ventricle are ignored.
503324
Baker Ross G. Jr.
Calfee Richard V.
Sanders Richard S.
Vandegriff Joe
Warren Jay
Intermedics Inc.
Ridout & Maybee Llp
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