Surgery – Truss – Pad
Patent
1979-09-27
1981-07-21
Howell, Kyle L.
Surgery
Truss
Pad
128653, 128782, 340573, A61B 508
Patent
active
042792576
ABSTRACT:
The total disclosure is of a method and assembly for monitoring respiration and detecting apnea. The assembly includes an oscillator for generating an electromagnetic field having an output frequency in the radio frequency range and a high Q passively tuned LC circuit which has a resonant frequency variable in the radio frequency range generated by the oscillator. The LC circuit responds to the electromagnetic field by absorbing electromagnetic energy from the field when the resonant frequency matches the output frequency of the oscillator. A band is positioned about the subject's chest or abdominal cavity to vary the resonant frequency of the LC circuit in response to the expansion and contraction of the subject's chest or abdominal cavity. A detecting means is also provided for detecting when the LC circuit is responsive to the electromagnetic field established by the oscillator. The claimed invention includes the passive circuit having a variable resonant frequency and force transfer means for transferring forces to the passive circuit to vary the resonant frequency. The force transfer means includes a body and the passive circuit includes a movable element movably supported by the body with force reaction means interconnecting the body and the movable element to move the movable element in response to forces from an object. A slip clutch is included to allow lost motion after a given movement of the movable element.
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Rolfe, P., Proceed. of 1st Conv. Exh. in Bioengineering, Milan, Italy, (19-24 Jun. 1972), 7 pages.
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