Surgery – Truss – Pad
Patent
1990-11-20
1994-01-18
Howell, Kyle L.
Surgery
Truss
Pad
128666, 356 41, A61B 500
Patent
active
052792951
ABSTRACT:
A sensor includes a pair of resiliently loaded jaws for receiving a finger, the sensor including a pair of fiber optic light transmitting guides secured in fixed spaced relation to one of the jaws for sensing blood in the finger tip. A control unit includes a light generator for transmitting light modulated at first and second frequencies to one of the guides via a light guide transfer section. The finger pulse modulates the received transmitted light. The modulated light is sensed by the other guide and returned to a receiver in the control unit via the transfer section for separating and demodulating the different frequency signals. The control unit includes a calculating unit which has two branches for processing and then combining by dividing the processed demodulated signals for determining the oxygen content of the blood from the relative magnitudes of the pulse-dependent modulation factor of the wave reflected from the finger.
REFERENCES:
patent: 3461856 (1965-10-01), Polanyi
patent: 3998550 (1976-12-01), Konishi et al.
patent: 4621643 (1986-11-01), New, Jr. et al.
patent: 4807630 (1989-02-01), Malinouskas
patent: 5035243 (1991-07-01), Muz
patent: 5058587 (1991-10-01), Kohno et al.
patent: 5070874 (1991-12-01), Barnes et al.
Nellcor Pulsoximeter, Model N-100E, pp. 27, 28, 39 and 40, by Drager, Sep. 1986.
Helzel Thomas
Kordts Jurgen
Martens Gerhard
Howell Kyle L.
Slobod Jack D.
Sykes Angela D.
U.S. Philips Corporation
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