The finger pulse oximeter is suitable for measuring the human body's pulse oxygen saturation (blood oxygen saturation) and pulse rate, and can be used in families, hospitals, oxygen bars, community medical care, sports health care, and is suitable for most people. Today, Berry shares with you the factors that affect the accuracy of finger pulse oximeter readings.
Factors Influencing the Accuracy of Finger Pulse Oximeter Readings
1: finger sleeve shift
SPO2 measurement is to fix the probe finger cuff on the patient's nail bed, use the finger as a transparent container for hemoglobin, use the red light with a wavelength of 660 nm and the near-infrared light with a wavelength of 940 nm as the incident light source, and measure the light transmission intensity through the tissue bed. , to calculate the hemoglobin concentration and oxygen saturation. If the nail bed is not facing the red light, the probe can not be probed too deep or too shallow to sense the change of blood oxygen saturation, so the blood oxygen saturation reading is low or not displayed. The main reason is that the patient is agitated, uncooperative, or pulls the SPO2 finger cuff connection when turning over, so that the finger cuff is displaced.
2: Fingertip skin is cold
Intraoperative exposure time is long, causing patients to shiver and cold skin, resulting in low or no display of the SPO2 value read by the fingertips. Attention should be paid to keeping the limbs warm, keeping the room temperature at 24-28°C, and if necessary, cover with a quilt or use a hot water bottle to keep warm.
3: Abnormal skin or color on the fingertips
Patients with nail polish, fake nails, and nail lesions such as onychomycosis caused the nail bed to be too thick. Some data show that blue, green, and black nails can make the pulse oximeter display low false readings, resulting in a 3% to 6% error effect. SPO2 test results.
How to operate a finger pulse oximeter?
Press the Reset button first, and the screen will display the ready status. Then press to open the clip. Insert the middle finger of the left or right hand into the working compartment, and then you can see the infrared light in the working compartment. It should be noted that the fingers should not be crooked, the hands should not be wet, and there should be no foreign objects (such as nail polish) on the nail surface. After waiting for the finger and the working chamber to fully contact, the LED shows the detection speed. When entering the detection state, you should pay attention to keep the tested finger stable, do not shake it up and down, left and right, it is best to place your hand on the table steadily, and adjust your breathing evenly.
Principle of finger pulse oximeter
We all know that the role of hemoglobin is to carry oxygen to all parts of the body. We call the oxygen content of hemoglobin at any time as blood oxygen saturation. The finger oximeter measures this blood oxygen saturation. Hemoglobin has a state of carrying oxygen, and of course also has an empty state. We call the hemoglobin carrying oxygen as oxyhemoglobin, and the hemoglobin in the empty state is called reduced hemoglobin.
Oxyhemoglobin and reduced hemoglobin have different absorption properties in the visible and near-infrared spectral ranges. Reduced hemoglobin absorbs more red frequency light and less infrared frequency light; while oxyhemoglobin absorbs less red frequency light and more infrared frequency light. This distinction is the most basic basis for finger oximeters. The finger oximeter displays blood oxygen saturation data on the display.
Finger Pulse Oximeter Exporter - Berry
Shanghai Berry Electronic Technology Co., Ltd. is committed to the research and development, manufacturing and sales of medical electronic instruments in the monitoring field. Our technology has reached the domestic advanced level. Important breakthroughs have been made in non-invasive blood pressure calculation methods, blood oxygen saturation detection, and multi-parameter monitoring systems. After years of development, we have established good cooperative relations with many customers. Welcome new customers to come to consult!
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