DARAY V409 Руководство пользователя - Страница 8

Просмотреть онлайн или скачать pdf Руководство пользователя для Медицинское оборудование DARAY V409. DARAY V409 17 страниц. Fingertip pulse oximeter

6 Operation

Press the power button to turn on the device. The OED screen appears display. If there is no

finger inserted into the device, the device will automatically shut down in 8 seconds to save

power.

NOTE

The device is powered by batteries. The batteries must be installed in the device before

powering on. If the battery power is insufficient, the device may fail to be turned on. At

this moment, the batteries should be replaced with new ones.

Measurement principle

SpO2 plethysmogram measurement is employed to determine the oxygen saturation of

hemoglobin in the arterial blood. The SpO2/PLETH parameter can also provide a pulse rate

signal, pulse strength and a plethysmogram wave. How the SpO2 I PLETH Parameter Works

 Arterial oxygen saturation is measured by a method called pulse oximetry. It is a

continuous, non-invasive method based on the different spectra absorption of hemoglobin

and oxyhemogiobin (called spectrophotometer principle). It measures how much light,

sent from light sources on one side of the sensor, is transmitted through patient tissue

(such as a finger or a toe), to a receiver on the other side.

 The sensor measurement wavelengths are nominally 660nm for the Red

 LED and 940nm for Infrared LED.

Maximum optical power output for LED is 4 mW.

 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 derive

the oxygen saturation of the arterial blood. Detecting the pulsation gives a PLETH

waveform, pulse rate signal and pulse strength.

 The SpO2 value, PR value and pulse strength can be displayed on the screen.

 SpO2 is a non-invasive measurement of the functional oxygen saturation.

 The light sources and the receiver of the sensor are laid in the two rubber cushions of the

device respectively.

Measurement steps

 Press (5) in the Figure3-1 and open the clip.

 Insert the patient's finger into the rubber cushions of the clip, make sure the finger is in

the right position as shown in figure 6-1, and then clip the finger.

 Press the power button on the front panel to turn on the device.

 Using first finger, middle finger or ring finger when doing test.

 Do not shake the finger and keep the patient at ease during the process.

 The readings will be displayed on the LED screen momentarily.

Figure 6-1 Put Finger Into the correct position