Portable pulse oximeter

Details Portable pulse oximeter Portable pulse oximeter

1994-04-01

1996-11-19

Sykes, Angela D.

Surgery

Truss

Pad

356 41, A61B 502

Patent

active

055752845

ABSTRACT:
A diagnostic instrument for determining a cardiovascular system parameter. In one embodiment, the instrument takes the form of a portable pulse oximeter comprising a light to frequency converter (LFC) as a sensor. Also provided is a light to frequency converter comprising a photoresistor and capacitor in circuit communication with an inverting Schmitt trigger and configured such that the inverter generates a periodic electrical signal corresponding to the amount of electromagnetic radiation illuminating the photoresistor.

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"Optimization of Portable Pulse Oximetry Through Fourier Analysis," John E. Scharf et al., IEEE, Jun. 1993, pp. 233-235, first available on Apr. 2, 1993, at the IEEE, 12th Southern Biomedical Conference at Tulane University, New Orleans, LA, held Apr. 2-4, 1993.
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