Method and apparatus for controlling the base frequency of a cardiac pacemaker
First Claim
1. A process for controlling a base frequency of a cardiac pacemaker having a sensor monitoring a physiological parameter and circuits for monitoring stimulated and spontaneous cardiac events, the base frequency having a corresponding base interval, comprising the steps of:
- (a) providing an initial programmed base frequency;
(b) monitoring an activity level of a patient;
(c) determining whether the patient activity level corresponds to one of a rest phase and an active phase; and
(d) adjusting the base frequency and corresponding base interval as a function of the determined rest phase to control the base frequency wherein the adjusted base frequency is variable relative to the initial programmed base frequency.
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Accused Products
Abstract
Process of control of the base frequency of a cardiac pacemaker having at least one sensor monitoring a physiological parameter. Rest phases and resumption of activity phases are detected to adapt automatically the base frequency of the pacemaker to the relative periods of rest and activity of the patient. Thus, the base frequency is allowed to decrease below the normally programmed base frequency in response to actual patient rest, to encourage a low spontaneous cardiac rhythm to inhibit pacing.
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Citations
48 Claims
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1. A process for controlling a base frequency of a cardiac pacemaker having a sensor monitoring a physiological parameter and circuits for monitoring stimulated and spontaneous cardiac events, the base frequency having a corresponding base interval, comprising the steps of:
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(a) providing an initial programmed base frequency; (b) monitoring an activity level of a patient; (c) determining whether the patient activity level corresponds to one of a rest phase and an active phase; and (d) adjusting the base frequency and corresponding base interval as a function of the determined rest phase to control the base frequency wherein the adjusted base frequency is variable relative to the initial programmed base frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus for controlling a base frequency of a cardiac pacemaker, the base frequency having a corresponding base interval, comprising:
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an initial programmed base frequency; first means for determining an activity level of the patient and determining whether the patient activity level corresponds to one of a rest phase and an active phase; and means for automatically adjusting the base interval as a function of a determined rest phase wherein the adjusted base interval varies relative to the initial programmed base frequency. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification