Operator's Manual

Preparing the Monitor
82
BIS™ Advance Monitor
3.6.3. Sensor Check
Ensure that the BISx or BISx4 module is connected to the monitor, as described in
3.6.1 Connecting the Monitor on page 71. Attach the selected sensor to the BISx or
BISx4 module. Please note that the sensors are consumable products with a defined
lifetime and expiry date. An expired sensor or a sensor that has been used beyond its
defined lifetime may pass the sensor check (depending on various use parameters),
but it is strongly recommended to avoid use of expired sensors and replace sensors
after 24 hours. Use of expired or over-used sensors may cause degraded
performance.
Connect the sensor to the patient as described in 3.6.2 Connecting a Sensor to a
Patient on page 78.
The device will begin an automatic sensor check when a sensor is connected to the
BISx module. The sensor check process tests impedance at each sensor section; it is
designed to assess the functionality of the sensor and the quality of the contact (to
the patient) and connection (to the monitor) of the sensor, to determine whether the
sensor can be used in patient monitoring.
The sensor check will then begin. Reference Figure 27. Sensor Check Window: In
progress and Completed on page 85 for the appearance of the sensor check window.
The auto sensor check process, during which the system checks that the sensor is
connected properly to the patient, takes a few seconds. The system provides an
indication for this process: Sensor check in progress. The automatic sensor check
will detect any sensor problems.
The sensor check window will show the status of the sensor check. If Display
Sensor Check Values is selected (at the top left of the window) the impendence
value of each electrode will be displayed. (For more information, reference 3.15.3.4
Sensor Check Values on page 134.) If it is not selected, PASS, NOISE, HIGH or POOR
CONTACT labels for each electrode will be displayed. The sensor check window will
indicate Sensor check completed successfully and then automatically close.
If the sensor check result is PASS (whether the sensor check was manual or
automatic), the system shall exit the manual sensor check mode and begin
monitoring. If the sensor check does not pass the test, i.e., at least one of the
electrodes is not within the defined impedance range, the sensor check results will
display the resulting icons and/or values, and you will not be able to begin
monitoring with that sensor.