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Technical Discussion
O
M
Technology
XI
AX
MP-506 Interface
108
The N-550B is designed to use Nellcor brand sensors containing O
technology. These sensors can be identified by their deep blue plug color. All
O
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-compatible sensors contain a memory chip carrying information
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about the sensor which the oximeter needs for correct operation, including the
sensor's calibration data, model type, troubleshooting codes, and error
detection data. This unique oximetry architecture enables several new features
with the N-550B.
When an O
M
-compatible sensor is connected to the N-550B, the N-550B
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will first read the information in the sensor memory chip, check it to make
sure that there are no errors, and then load the data to begin monitoring. As
the N-550B reads the information, it flashes the sensor model number on its
display. This process only takes a couple of seconds. Once the reading process
is complete, the sensor model number will stop flashing on the display, and
then the N-550B will begin monitoring. The sensor model number disappears
once the N-550B starts tracking the patient's SpO
Monitors containing O
XI
calibration data contained in the sensor in calculating the patient's SpO
having the calibration in the sensor, rather than the N-550B, Nellcor is able to
improve the published accuracy of many sensors, because the calibration
coefficients can be tailored to each sensor. Consult the accuracy card included
with the N-550B for specific accuracy information for the N-550B with
different Nellcor sensors.
The N-550B uses the information in the O
troubleshooting messages for the clinician. The sensor contains coding that
tells the N-550B what kind of sensor is being used. When deciding what
messages to display, the N-550B takes into account the sensor type and
recommended patient site for that model. The N-550B O
therefore has an intelligent troubleshooting system.
The MP-506 interfaces with the N-550B through two connections. Figure 47
illustrates the interconnection, and Table 21 and Table 22 identify the signals.
M
technology, including the N-550B, use
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M
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M
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and pulse rate.
2
2
-compatible sensor to tailor
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system
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. By
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