Medical diagnostic instrument using light-to-frequency converter

Details Medical diagnostic instrument using light-to-frequency converter Medical diagnostic instrument using light-to-frequency converter

1996-11-18

2000-01-04

Winakur, Eric F.

Surgery

Diagnostic testing

Measuring or detecting nonradioactive constituent of body...

600479, A61B 500

Patent

active

060119853

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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