Oximeter red and IR zero calibration control

Details Oximeter red and IR zero calibration control Oximeter red and IR zero calibration control

2008-05-13

2008-05-13

Winakur, Eric (Department: 3768)

Surgery

Diagnostic testing

Measuring or detecting nonradioactive constituent of body...

C600S310000

Reexamination Certificate

active

10788239

ABSTRACT:
A pulse oximeter with drive lines for driving red and IR LEDs, and a drive circuit for driving those drive lines. A processor controls the drive circuit using a red zero output line and an IR zero output line directly connected between the processor and the drive circuit. This allows a control signal to directly control the turning off of either the red or IR drive transistors to prevent forward current flow through the red and IR LEDs by overriding the ongoing programmable logic state machine control of the drive transistors. The effects of crosstalk and capacitive coupling are reduced as a result.

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