Rate responsive cardiac pacemaker

Details Rate responsive cardiac pacemaker Rate responsive cardiac pacemaker

1989-06-22

1991-09-03

Jaworski, Francis

Surgery

Truss

Pad

A61N 136

Patent

active

050443666

ABSTRACT:
A rate responsive cardiac pacemaker for implantation in a patient utilizes a pair of sensors. One is an activity sensor responsive to movements of the patient for generating an electrical signal representative thereof. A preselected component of the electrical signal generated by the activity sensor detected in a frequency range below 4 Hz distinguishes true physical exercise by the patient from other movements of the patient. The second sensor is responsive to a preselected metabolic function of the patient's body, such as central venous blood temperature, to develop an output signal representative of the present state of physical exercise of the patient. In response to (i) variation of the detected component in the range below 4 Hz and (ii) the output signal of the second sensor indicative of confirmation or lack of confirmation of physical exercise, the pacemaker generates pulses at a rate that varies according to a combination of those two. In this way, the patient's heart rate is paced according to the state of the patient's true physical exercise.

REFERENCES:
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"Experiences with a Two-Sensor-Controlled Rate-Adaptive Pacemaker System", German publication, Herzschrittmacher, 6:64-67 (1986), Author: Heuer et al.
"Sensing Internal and External Body Activities", by Bunge et al.

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