Covidien Nellcor OxiMax N-560, Service Manual

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Technical Discussion
N-560 Service Manual 109
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Technology
The N-560 is designed to use Nellcor brand sensors containing
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technology. These sensors can be identified by their deep blue plug color. All
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sensors contain a memory chip carrying information 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-560.
When an
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sensor is connected to the N-560, the N-560 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-560 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-560
will begin monitoring. The sensor model number disappears once the N-560
starts tracking the patient’s SpO
2
and pulse rate.
Monitors containing
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technology, including the N-560, use calibration
data contained in the sensor in calculating the patient’s SpO
2
. By having the
calibration in the sensor, rather than the N-560, 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-560
for specific accuracy information for the N-560 with different Nellcor
sensors.
The N-560 uses the information in the
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sensor to tailor troubleshooting
messages for the clinician. The sensor contains coding that tells the N-560
what kind of sensor is being used. When deciding what messages to display,
the N-560 takes into account the sensor type and recommended patient site for
that model sensor. The N-560
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system therefore has an intelligent
troubleshooting system.
NELL-3 Interface
The NELL-3 interfaces with the N-560 through two connections. Figure 47
illustrates the interconnection, and Table 21 and Table 22 identify the signals.