Surgery – Truss – Pad
Patent
1994-08-24
1996-09-17
Sykes, Angela D.
Surgery
Truss
Pad
356 41, A61B 500
Patent
active
055558828
ABSTRACT:
The present invention provides a method and apparatus for adapting to noise sources affecting a pulse oximeter. Various available frequencies are evaluated to determine their respective noise levels and one is selected to act as the operating demultiplexer frequency. During normal operation of the pulse oximeter, the various available demultiplexer frequencies are periodically scanned to determine which has the lowest associated noise. The noise level associated with the operating frequency is used to determine the signal-to-noise ratio of the pulse oximeter signals and thereby qualify certain signals from the pulse oximeter. Those pulses associated with a signal-to-noise ratio below a predetermined threshold are rejected and excluded from use in calculating blood oxygen saturation.
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Bennett Terrence R.
Bernstein Michael
Okikawa Jerry K.
Richardson Charles A.
Nellcor Incorporated
Sykes Angela D.
Winakur Eric F.
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