Telemetry system

Details Telemetry system Telemetry system

1984-03-23

1986-01-07

Kamm, William E.

Surgery

Truss

Pad

128903, N61N 100

Patent

active

045628408

ABSTRACT:
A telemetry system is provided for communicating with an implanted pacer. A patient's coil is positioned on the patient substantially overlying the implanted pacer. An FM oscillator generates a waveform which varies in frequency and amplitude in response to the telemetry signals from the implanted pacer. The varying frequency generated by the oscillator may be utilized to determine the proximity of the patient's coil with respect to the implanted pacer. An analog signal is generated that has a parameter which varies in inverse proportion to the proximity of the coil to the pacer. The varying waveform generated by the oscillator may also be used to reconstruct telemetry signals that are generated by a tank circuit that is contained in the pacer. An automatic gain control circuit is used to provide a corrected gain notwithstanding the position of the patient's coil with respect to the implant.

REFERENCES:
patent: 3195540 (1965-07-01), Waller
patent: 3426748 (1969-02-01), Bowers
patent: 3580243 (1971-05-01), Johnson
patent: 4000461 (1976-12-01), Barber et al.
patent: 4223679 (1980-09-01), Schulman et al.
patent: 4252129 (1981-02-01), Tamora et al.
Furman et al., "Medical Research Engineering" 3rd Qtr., 1967, pp. 29-32.

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