Oximeter sensor adapter with coding element
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United States of America Patent
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May 27, 2003
Grant Date -
N/A
app pub date -
Sep 21, 2000
filing date -
Sep 21, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
An oximeter sensor adapter which allows a sensor without a resistor in parallel with its LEDs to operate with an oximeter expecting such a resistor in parallel. The adapter includes LED drive electronics and appropriate oximeter drive current sensing circuitry for converting the drive signals from the oximeter into appropriate LED drive signals for the sensor. Instead of a resistor being on the sensor in parallel with one or more of the LEDs, the resistor is placed across the leads in front of the LED drive electronics and oximeter drive current sensing circuitry, on the oximeter side of the adapter. By providing LED drive electronics and oximeter drive current sensing circuitry which do not draw significant current at a low voltage, the oximeter is able to measure the resistor independently just as if it were in parallel with the LEDs.
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