Rate-adaptive cardiac pacemaker

Details Rate-adaptive cardiac pacemaker Rate-adaptive cardiac pacemaker

2006-06-20

2006-06-20

Pezzuto, Robert E. (Department: 3762)

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

Reexamination Certificate

active

07065404

ABSTRACT:
A rate-adaptive cardiac pacemaker has a detection unit1, an event-determining unit2, a stimulation control unit3and a stimulation unit11, wherein the event-determining unit2is connected to the detection unit1and the stimulation control unit3, and the stimulation unit11is connected to the stimulation control unit3. The detection unit1detects ECG signals of a heart100, and the event-determining unit2, on the basis of the ECG signals detected by the detection unit1and signals emitted by the stimulation control unit3, determines whether a detected event represents a spontaneous or a stimulated event (Ap, As; AES, Vp, Vs, VES). The stimulation control unit3ascertains a stimulation rate based upon a base rate and a physiological demand and varies the base rate based upon the event-determining unit2in a first mode, when atrial events occur in such a way that in the case of a spontaneous atrial event a spontaneous interval is prolonged by a first change value and that in the case of a stimulated atrial event a base interval is prolonged by a second change value, whereby in both cases the base rate is lowered, and in a second mode, when ventricular events occur, the stimulation control unit3varies the base rate in such a way that in the case of a spontaneous ventricular event the base rate is raised and in the case of a stimulated ventricular event the base rate is lowered. The stimulation unit stimulates the heart in accordance with the signals received from the stimulation control unit3.

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Duru, et al., “Clinical Evaluation of a Pacemaker Algorithm that Adjusts the Pacing Rate During Sleep Using Activity Variance,” PACE, p. 1509-15, (Oct. 21, 2000).

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