DIGIOXI PO-930 운영자 매뉴얼 - 페이지 13

{카테고리_이름} DIGIOXI PO-930에 대한 운영자 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. DIGIOXI PO-930 19 페이지. Pulse oximeter monitor

페이지 인쇄
A

Theory of Operation

.
The functioning of the DIGIOXI PO-930 pulse oximetry is based on the assumption that hemoglobin exists in
two principle forms in the blood:
- Oxygenated ( With O
- Reduced
Arterial oxygen saturation ( SpO
( HbO
+ Hb + other types of hemoglobin's ).
2
An Oximeter measures the absorption of selected wavelengths of light passing throughout a living, tissue
sample. Since oxygenated hemoglobin and reduced hemoglobin absorb light as know functions of wavelengths,
the relative percentage of these two constituents, and SpO2 are calculated. The problem is translating oximetry
theory into a medical device is differentiating between the absorption due to oxygenated and reduced
hemoglobin and the absorption due to all other tissue constituents.
The problem is solved with a two wavelength pulsatile system. The pulsation of arterial blood flow present, at a
particular test site modulates the light the oximeter's probe detects. Since other fluids and tissues present at
the test site generally don't pulsate, they do not modulate the light passing, through the test site area. Therefore
the attenuation of light energy due to arterial blood flow can be detected, and isolated. Thus providing the basis
for the necessary calculations, by using the pulsatile portion of the incoming signal.
1
660
10x
0
-
-
6
Two wavelengths of light, red and infrared, are utilized to gauge the presence of oxygenated and reduced
hemoglobin.
Oxygenated hemoglobin (HbO
characteristics to red and infrared lights. (FIG.1).
The probe's photodetector converts the light, which is partially absorbed and modulated as it passes through the
tissue sample, into an electronic signal. FIG.2.
Operators Manual Pulse Oximeter Monitor DIGIOXI "PO-930"

SECTION 5 - Oxygen Saturation Monitoring

molecules loosely bound) or HbO
2
( With No O
molecules bound ) or Hb.
2
) is defined as the ratio of oxygenated hemoglobin ( HbO
2
SpO
=
2
HbO
940nm
HbO
Hb
7
8
9
100
FIG.1
) and reduced hemoglobin (Hb) exhibit markedly different absorption (extinction)
2
.
2
HbO
2
+ Hb + (others Hemoglobin's)
2
ABSORPTION
Digicare Biomedical Technology Inc.
) to total hemoglobin
2
TIME
FIG.2
11