Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Reexamination Certificate
2005-03-22
2005-03-22
Layno, Carl (Department: 3762)
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
C607S014000
Reexamination Certificate
active
06871097
ABSTRACT:
A pacemaker is operable in a tracking and a non-tracking mode and has an automatic mode switching function for switching the pacemaker into the non-tracking mode of operation in response to the detection of atrial tachycardia. A comparator compares an atrial interval, between detected atrial events, with a predetermined atrial tachycardia limit value and records a tachycardia indication if the interval is less than the atrial tachycardia limit value. The mode switching unit switches the mode of operation to the non-tracking mode if the number of recorded tachycardia indications reaches a predetermined tachycardia count limit. Intervals between other cardiac events detected by the atrial detector or a ventricular detector also are supplied to the comparator wherein they are compared with the atrial tachycardia limit value. The recorded number of tachycardia indications is reduced by one if at least one of these additional intervals, during a pacemaker interval between two consecutive ventricular stimulations or between two consecutive R-wave detections, is longer than the tachycardia limit value.
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Layno Carl
St. Jude Medical AB
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