Apparatus for sensing and transmitting a pacemaker's stimulating

Details Apparatus for sensing and transmitting a pacemaker's stimulating Apparatus for sensing and transmitting a pacemaker's stimulating

1975-03-06

1976-10-19

Kamm, William E.

Surgery

Truss

Perineal

128 21A, 128419PT, 307267, 328 58, A61B 504

Patent

active

039864960

ABSTRACT:
Apparatus is disclosed for sensing and transmitting the stimulating pulse of an implanted pacemaker over readily available, low-bandwidth transmission media to a remote receiver capable of measuring the pulse width to provide an indication of the condition of the pacemaker energy source, e.g. a battery. In particular, the sensing and transmitting apparatus detects the electrical activity, e.g. the EKG, of a patient through attached electrodes and modulates a carrier or tone of a suitable frequency to be transmitted over the low-bandwidth transmission line to the receiver, along with a pulse signal multiplied by a selected, fixed factor dependent upon the carrier frequency of the signal and the other information to be transmitted to the receiver. In one illustrative embodiment, the signal is multiplied by an analog circuit which includes a detection circuit responsive to the leading and trailing edges of the stimulating pulse to generate corresponding first and second signals, an integrating circuit, a first switch responsive to the first signal for applying a first reference potential to the integrating circuit to integrate the first reference signal for a period corresponding to that of the width of the stimulating pulse, and a second switch responsive to the second signal to apply a second reference potential to the integrating circuit for a second period of time, whereby the total of the first and second periods correspond to the multiplied width of the stimulating pulse.

REFERENCES:
patent: 3473050 (1969-10-01), Groom
patent: 3769965 (1973-11-01), Raddi et al.
patent: 3871363 (1975-03-01), Day

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