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Characteristics of Reductive Hemoglobin (Hb) and Oxyhemoglobin (HbO2) in glow
& near-infrared zones. Operation principle of the device is: Photoelectric
Oxyhemoglobin Inspection Technology is adopted in accordance with Capacity
Pulse Scanning & Recording Technology, so that two beams of different
wavelength of lights can be focused onto human nail tip through perspective
clamp finger-type sensor. Then measured signal can be obtained by a
photosensitive element, information acquired through which will be shown on
screen through treatment in electronic circuits and microprocessor.
3.2 Caution
1. The finger should be placed properly (see the attached illustration of this
manual, Figure 5), or else it may cause inaccurate measurement.
2. The SpO
sensor and photoelectric receiving tube should be arranged in a way
2
with the subject's arteriole in a position there between．
3. The SpO
sensor should not be used at a location or limb tied with arterial
2
canal or blood pressure cuff or receiving intravenous injection.
4. Make sure the optical path is free from any optical obstacles like rubberized
fabric.
5. Excessive ambient light may affect the measuring result. It includes
fluorescent lamp, dual ruby light, infrared heater, direct sunlight and etc.
6. Strenuous action of the subject or extreme electrosurgical interference may
also affect the accuracy.
7. Testee can not use enamel or other makeup.
3.3 Clinical Restrictions
1. As the measure is taken on the basis of arteriole pulse, substantial pulsating
blood flow of subject is required. For a subject with weak pulse due to shock,
low ambient/body temperature, major bleeding, or use of vascular contracting
drug, the SpO
will be more sensitive to interference.
2. For those with a substantial amount of staining dilution drug (such as
methylene blue, indigo green and acid indigo blue), or carbon monoxide
hemoglobin (COHb), or methionine (Me+Hb) or thiosalicylic hemoglobin, and
some with icterus problem, the SpO
waveform (PLETH) will decrease. In this case, the measurement
2
Figure 1
determination by this monitor may be
2
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