Rate responsive cardiac pacemaker

Details Rate responsive cardiac pacemaker Rate responsive cardiac pacemaker

1990-04-27

1991-05-14

Jaworski, Francis

Surgery

Truss

Pad

A61N 100

Patent

active

050147048

ABSTRACT:
An implantable variable rate pacemaker adaptive to patient exercise includes a motion sensor for detecting physical activity of the patient and producing an electrical signal having an amplitude vlaue representative of the intensity of the physical activity. The electrical signal is selectively limited to appreciable amplitude values for detected physical activity which is related to true physical exercise by the patient, in contrast to activity related to internal and external disturbances on the patient. The pacemaker compares the amplitude values of the selectively limited electrical signal to successively higher programmed threshold values representative of successively greater workloads of physical exercise to adjust the pacing rate to a higher rate as each of the threshold values is exceeded. The motion sensor is an accelerometer implemented in a semiconductor device which converts mechaical movements to an electrical signal having an amplitude representative of the intensity of the mechanical movements, and is housed within and isolated from the pulse generator case of the pacemaker. The electrical signal is processed by a circuit integral with the semiconductor device which limits the signal amplitude to appreciable values in response to detected physical activity in a preselected frequency range.

REFERENCES:
patent: 4771780 (1988-09-01), Sholder
patent: 4802481 (1989-02-01), Schroeppel
patent: 4926863 (1990-05-01), Alt

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