FINGERTIP PULSE OXIMETER

タイトルまたは説明

Theprincipleofpulseoximeterisbasedontheredandinfraredlightabsorptioncharacteristicsof oxygenatedanddeoxygenated hemoglobin.Oxygenated hemoglobin absorbs more infrared light and allows more red light to pass through (Figure 1). Deoxygenated (or reduced) hemoglobin absorbs more redlightandallowsmoreinfraredlighttopassthrough.Redlightisinthe******0nmwavelengthlight band.Infraredlightisinthe*******0nmwavelengthlightband. Pulse oximeter sensors have red and infrared low voltage light emitting diodes (LEDs) wich serve as light sources. The emitted light is transmitted through the tissue, then detected by the photodetector and sent to the microprocessor of the pulse oximeter. All constituents of the human body, venous and arterial blood, and tissue absorb light (Figure 2). The pulsating of arterial blood results in changes in the absorption to to added hemoglobin (Hb) and oxygenated hemoglobin (HbO2) in the path of the light. Since HbO2 and Hb absorb light to varying degrees, this varying absorption is translated into plethysmographic waveforms at both red and infrared wavelengths. The relationship of red and infrared plethysmographic signal amplitude can be directly related to arterial oxygen saturation.
Dear users, thank you very much for purchasing the Pulse Oximeter. This manual contains the instructions necessary to operate the product safely and in accordance with its function and intended use. Observance of this manual is a prerequisite for proper product performance and correct operation and ensures patient and operator safety.
(RED) **0nm
(INFRARED) **0nm
**0 **0 **0 **0 ***0
*2
*1
0
1
WAVELENGTH(nm)
EXTINCTION(*0X)
HbO2
Hb
IR Led Red Led
PhotoDiode
Figure 1  Absorption spectra of HbO2 and Hb for red and infrared wavelengths
Figure 2 Oximeter's schematic illustration