Method for reducing ambient noise effects in electronic monitori

Details Method for reducing ambient noise effects in electronic monitori Method for reducing ambient noise effects in electronic monitori

1992-10-23

1994-11-29

Sykes, Angela D.

Surgery

Truss

Pad

128734, 365 41, A61B 500

Patent

active

053682246

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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patent: 4819752 (1989-04-01), Zelin
patent: 4867571 (1989-09-01), Frick et al.
patent: 4869254 (1989-09-01), Stone et al.
patent: 5040539 (1991-08-01), Schmitt et al.
patent: 5203329 (1993-04-01), Takatani et al.

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