A - Human Necessities – 61 – N
Patent
A - Human Necessities
61
N
354/22, 326/1.3
A61N 1/36 (2006.01) A61B 5/04 (2006.01) A61N 1/362 (2006.01) A61N 1/372 (2006.01)
Patent
CA 1171140
ABSTRACT The specification describes an improved cardiac pacer, and more particularly a pacer which is adapted for implantation in a patient. The cardiac pacer apparatus has an electrode means including at least a first electrode adapted to stimulate the heart; control means including timing means which defines a sample time window and signal detector means including sensing means for sensing cardiac signals on the electrode means. Filter means including a filter circuit receive the signal sensed by the sensing means for quantizing the sensed signal and continuously generating digital words representative of the slope of the sensed signal over the sample time window. Parameter memory means store signals representative of predetermined selection criteria for defining at least one component of a cardiac cycle signal. A selection circuit means including a selection circuit responsive to the quantized output signals of the filter means and the stored selection criteria signals generates a detection signal if the digital slope words meet the predetermined selection criteria. Finally generator means generate a stimulating signal and couple the same to the electrode means if the selection circuit means fails to generate the detection signal within a predetermined time from a previous detection signal or a previous stimulating signal.
366664
American Hospital Supply Corporation
Macrae & Co.
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