<p>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.</p>
申请公布号
WO2005082238(A1)
申请公布日期
2005.09.09
申请号
WO2005US06206
申请日期
2005.02.25
申请人
NELLCOR PURITAN BENNETT INCORPORATED;CHEW, BRADFORD, B.;PETERSEN, ETHAN;SHEA, WILLIAM