User Manual for Vital Signs Monitor
47
8.3.5 Points to be noted in SpO
2
and Pulse Measuring
The finger should be properly placed (see the attached illustration of this instruction manual), or
else it may cause inaccurate measurement result.
Make sure that capillary arterial vessel beneath the finger is penetrated through by red and infrared
lights.
The SpO
2
sensor should not be used at a location or limb tied with arterial or blood pressure cuff or
receiving intravenous injection.
Do not fix the SpO
2
sensor with adhesive tape, or else it may result in venous pulsation and
consequential inaccurate measurement result of SpO
2
.
Make sure the optical path is free from any optical obstacles like adhesive tape.
Excessive ambient light may affect the measuring result. It includes fluorescent lamp, dual ruby
light, infrared heater, and direct sunlight etc.
Strenuous action of the subject or extreme electrosurgical interference may also affect the
accuracy.
Please do not use the SpO
2
sensor when having the MRI, or burn may be caused by faradism.
Always observe the plethysmogram (waveform), which is auto-scaled within the range of 100. The
SpO
2
reading may be unlikely true when the waveform is not smooth or irregular. If in doubt, rely
on your clinical judgment, rather than the monitor readout.
A functional tester cannot be used to assess the accuracy of the pulse oximeter monitor or a SpO
2
sensor. However, a functional tester, such as SpO
2
simulator can be used to check how accurately a
particular pulse oximeter is reproducing the given calibration curve. Before testing the oximeter by
a functional tester, please firstly ask the manufacturer which calibration curve is used, if necessary,
request the manufacturer for its dedicated calibration curve and download it into the tester.
8.4 Temperature Monitoring
The sensor is thermo-resistor type (25
℃
5k
Ω
) and is supplied with constant micro current. Calculating the
temperature of measured part through measuring the voltage. There is a period responding time, so the accurate
temperature value display after a while. The temperature monitoring can be divided into two measuring method:
measure through body surface temperature and through the temperature inside the body cavity (placed in
mouth or anus).
Normal value: body surface: 36.5
℃
~37
℃
; inside body cavity: 36.5
℃
~37.7
℃
Notes:
¾
Attach the TEMP transducer to the patient; generally if the TEMP transducer and skin doesn’t contact
closely, the measured value becomes lower, so for those who have requirement for temperature, add a
proper martial to transducer and fix it with adhesive tape to make them contact firmly.
¾
Especially for pediatric patient, they like sports, pay more attention to the transducer fixing.