Implantable cardiac stimulation device with dynamic self-regulat

Details Implantable cardiac stimulation device with dynamic self-regulat Implantable cardiac stimulation device with dynamic self-regulat

1998-12-14

2000-10-10

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 137

Patent

active

061297461

ABSTRACT:
An implantable cardiac device, such as a pacemaker or an implantable cardioverter-defibrillator that has a control unit which is adapted to sample a time-varying parameter relating to either the patient's changing physiological condition or to the delivery of therapeutic electrical stimulation pulse to the heart at a sampling frequency. The control unit is adapted to increase the sampling frequency when the variation between successive measurements of the parameter exceed a preselected value. The control unit is further adapted to decrease the sampling frequency when the variation between successive measurements of the parameter are less than a preselected value. In alternate embodiments, the parameter to be sampled is capture threshold, sensing threshold, lead-tissue impedance, and battery performance.

REFERENCES:
patent: 4708142 (1987-11-01), DeCote, Jr.
patent: 5209228 (1993-05-01), Cano et al.
M.L. Dohrmann, M.D. & N.F. Goldschlager, M.D., "Myocardial Stimulation Threshold in Patients with Cardiac Pacemakers: Effect of Physiologic Variables, Pharmacological Agents, Lead Electrodes," pp. 527-537, Cardiology Clinics, vol. 3, No. 4, Nov. 1985.

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