Surgery – Truss – Pad
Patent
1983-08-30
1985-04-30
Kamm, William E.
Surgery
Truss
Pad
128663, 128687, 128661, A61B 502
Patent
active
045137480
ABSTRACT:
A heart rate monitor for use where direct contact with a patient cannot be made utilizes two continuous radio frequency (RF) signals, one of relatively low frequency and one of relatively high frequency directed toward the patient whose heart is to be determined. Doppler shifted signals are reradiated by the patient back to the monitor. The reradiated low RF signal has doppler components due to bodily motion caused by respiration and heartbeat. The reradiated high RF signal has doppler components due to patient bodily movement caused by respiration. Doppler components due to heartbeat if any, are of substantially lower value than those associated with the low RF signal. The heart rate monitor includes a difference amplifier which effectively subtracts the doppler signal associated with the high RF frequency from the doppler signal associated with the low RF frequency to obtain a signal which contains only components due to the heartbeat of the patient.
REFERENCES:
patent: 3483860 (1969-12-01), Namerow
patent: 3561430 (1971-02-01), Filler, Jr. et al.
patent: 3780726 (1973-12-01), Hatke
patent: 4307728 (1981-12-01), Walton
patent: 4357944 (1982-11-01), Mauser et al.
Mawhinney Daniel D.
Nowogrodzki Markus
Kamm William E.
RCA Corporation
Shein Mitchell J.
Smiley Raymond E.
Tripoli Joseph S.
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