Gima 35152, Руководство пользователя

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69
Chapter 12 SpO
2
Monitoring
12.1 Introduction
SpO
2
Plethysmogram measurement is employed to determine the oxygen saturation of hemoglobin in the arterial blood.
If, for example, 97% hemoglobin molecules in the red blood cells of the arterial blood combine with oxygen, then the
blood has a SpO
2
oxygen saturation of 97%. The SpO
2
numeric on the monitor will read 97%. The SpO
2
numeric shows
the percentage of hemoglobin molecules which have combined with oxygen molecules to form oxyhemoglobin. The
SpO
2
/PLETH parameter can also provide a pulse rate signal and a plethysmogram wave.
How the SpO
2
/ PLETH Parameter Works
n Arterial oxygen saturation is measured by a method called pulse oximeter. It is a continuous, non-invasive method
based on the different absorption spectra of reduced hemoglobin and oxyhemoglobin. It measures how much light,
sent from light sources on one side of the sensor, is transmitted through patient tissue (for example, a finger), to a
receiver on the other side.The sensor measurement wavelengths are nominally 660nm for the Red LED and 880nm
for Infrared LED. Maximum optical power output for the Red LED is 6.65 mW and the Infrared LED is 6.75 mW.
Optical sensors as the light-emitting components, will bring influence to other medical devices applied the
wavelength range. This information may be useful for clinicians who carry out optical therapy.
n The amount of light transmitted depends on many factors, most of which are constant. However, one of these
factors, the blood flow in the arteries, varies with time, because it is pulsating. By measuring the light absorption
during a pulsation, it is possible to get the oxygen saturation of the arterial blood. Detecting the pulsation gives a
PLETH waveform and pulse rate signal.
n The SpO
2
value and the PLETH waveform can be displayed on the main screen.
12.2 Safety information
WARNING
l
Only the SpO
2
sensor specified in this manual can be used, please use it following the Use Manual, and obey
all warnings and precautions.
l
Check if the sensor cable is in normal condition before monitoring. After unplugging the SpO
2
sensor cable
from the socket, the system shall display the error message “SpO
2
SENSOR OFF” and give the audible
alarm.
l
Do not use the SpO
2
sensor once the package or the sensor is found damaged. Instead, you shall return it to
the vendor.
l
ES (Electrosurgery) equipment cable and SpO
2
cable must not be tangled up.
l
Prolonged and continuous monitoring may increase the risk of unexpected change of skin condition such as
abnormal sensitivity, rubescence, vesicle, repressive putrescence, and so on. It is especially important to
check the sensor placement of patient of poor perfusion or immature dermogram by light collimation and
proper attaching strictly according to changes of the skin. Check the sensor placement periodically and
move it when the skin deteriorates. More frequent examinations may be required for different patients.
l
The person who is allergic to silicone or ABS can not use this device.