User's Manual

2
Measurement principle
The principle of the oximeter is as follows: An experience formula of data process is established by
exerting Lambert Beer Law according to Spectrum Absorption Characteristics of Reductive
hemoglobin and oxyhemoglobin （HbO2 ) in red light and infrared light zones. Operation
principle of the instrument is to combine Photoelectric Oxyhemoglobin Inspection Technology with
Capacity Pulse Scanning and Recording Technology, so that two lights with different wavelength
(660nm red light and 940nm infrared light) can be focused onto human nail through perspective
clamp finger-type sensor. Then measured signal can be obtained by a photosensitive element,
information acquired through which will be shown on two groups of diodes through process in
electronic circuits and microprocessor.
Diagram of Operation Principle
1. Red-ray and Infrared-ray receiving diode
2. Red-ray and Infrared-ray transmitting diode
Precautions for use
1. Do not use the Fingertip Pulse Oximeter together with MRI or CT equipment.
2. Explosion hazard: Do not use the Fingertip Pulse Oximeter in an explosive atmosphere.
3. The Fingertip Pulse Oximeter is intended only as an adjunct in patient assessment. Doctors
should make diagnosis in conjunction with clinical manifestation and symptoms.
4. Check the Fingertip Pulse Oximeter sensor application site frequently to make sure that the
circulation and skin integrality of patient are under good condition.
5. The sensor of the oximeter is not suitable for contacting the adhesive tape, which may lead to
the error of measurement data or mistaking that there are blisters on the tested skin.
6. Please read the manual carefully before your operation.
7. The Fingertip Pulse Oximeter has no SpO2 alarm, it is not for continuous monitoring.
8. When used for a long time, it will produce discomfort or tenderness, especially for patients
with microcirculation disorders.Please change the test sites periodically according to different
situations of patients.The test site must be changed and the skin integrity and circulation
condition of the patient must be checked at least every 2 hours, and the correct adjustment
must be made.
9. Inaccurate measurements may be caused by autoclaving, ethylene oxide sterilizing, or
immersing the sensors in liquid.
10. Significant levels of dysfunctional hemoglobins (such as carboxyl-hemoglobin or
methemoglobin) may cause inaccurate reading.
11. Intravascular dyes such as indocyanine green or methylene blue may cause inaccurate reading.
12. SpO2 measurements may be adversely affected in the presence of high ambient light. Please
shield the sensor area (with a surgical towel or direct sunlight, for example) if it is necessary.
13. Unexpected action may cause inaccurate reading.
14. Medical signal with high frequency or interference caused by defibrillator may lead to