BT-720 Operation manual
P/N:720-ENG-OPM-ENG-R03
Bistos Co., Ltd.
2020.10
17
5 SpO
2
5.1 Overview
Blood oxygen saturation (SpO
2
) is the percentage of oxyhemoglobin (HbO2) capacity bound by oxygen
in the blood in the total hemoglobin (Hb) capacity that can be combined, that is, the concentration of
oxygen in the blood.
The principle for monitoring the pulse SpO
2
is to fix the probe fingerstall on the patient’s finger or toe,
use the finger (or toe) as a transparent container for hemoglobin, use 660nm wavelength red light and
950nm near-infrared light as the incident light, maximum output power is 300 mW, measure the light
transmission intensity through the tissue bed, and calculate the concentration of hemoglobin and SpO
2
.
The passing lights depend on a variety of factors, most of which are constant. However, one of these
factors, the arterial blood flow, changes with time, as it is pulsating. By measuring the light absorbed
during pulsating, it is possible to obtain the arterial blood SpO
2
. Detection pulsation can give a
“plethysmography” wave and pulse rate signal.
The main screen displays “SpO
2
” value and “plethysmography” wave.
This monitor applies to measure SpO
2
of adults (>18 years) and pediatric (<18 years,>30 days),
neonate (<30 days). Contact SpO
2
probe to Patient’s finger (or toe) to get “SpO
2
” value and
“plethysmography” wave.
SpO
2
function of this monitor has been calibrated in factory.
The monitor is defibrillation proof, so the monitor operates normally after defibrillation.
5.2 Safety information
WARNING
Please use SpO2 sensor supplied from Bistos, operate in accordance with the Manual,
and observe all warnings and precautions.
Before monitoring, check whether the sensor cable is normal. When SpO
2
sensor cable is
unplugged from the socket, the screen will display “SpO2 Sensor Off” error message,
and trigger an audible and visual alarm simultaneously.
If the sensor or sensor packaging has signs of damage, do not use this SpO
2
sensor;
return it to the manufacturer.
If there is carboxyhemoglobin, methemoglobin or dye diluted chemical, the SpO
2
value
will have deviation.
When the patient has a tendency to hypoxia, use the oximeter to analyze blood samples
in order to fully grasp the patient's condition.
Do not put the sensor on limbs with arterial duct or intravenous tube.
Do not intertwine electrosurgical equipment cable with the sensor cable.
Avoid using the monitor and sensors while using the NMR equipment, in order to avoid
severe burns to the patient as a result of induced currents.
During long time continuous monitoring of a patient, check the position of SpO
2
sensor
once every 2 hours, and move properly when the skin changes or every four hours.
Some patients may require more frequent inspection, such as patients with perfusion
disorders or sensitive skin, because persistent and prolonged monitoring may increase
unpredictable skin changes, such as allergies, redness, blistering or pressure necrosis.
Before using, verify compatibility between the monitor, probe and cable, otherwise it
may cause injury to the patient.
Functional testers cannot be used to evaluate the accuracy of pulse oximetry and pulse
oximetry.
SpO2 low alarm limit cannot be less than 85.
NOTE
Do not put the oxygen probe and blood pressure cuff on the same limb, because blood
flow occlusion during blood pressure measurement will affect the SpO
2
readings.
The monitor cannot be used to verify the accuracy of SpO
2
probe and SpO
2
equipment.
