General Description; Measurement Principles; Directions For Use - Microlife OXY200 Manual

2. General Description

Oxygen saturation indicates the percentage of hemoglobin
in arterial blood that is loaded with oxygen. This is a very
important parameter for the respiratory circulation system.
Many respiratory diseases can result in lower oxygen satu-
ration within human blood.
Following factors can reduce oxygen saturation: Auto-
matic regulation of organ dysfunction caused by anes-
thesia, intensive postoperative trauma, injuries caused by
some medical examinations. These situations may result in
light-headedness, asthenia and vomiting. Therefore, it is
very important to know the oxygen saturation of a patient
so that doctors can detect problems in a timely manner.

3. Measurement Principles

Principle of this fingertip pulse oximeter: A mathemat-
ical formula is established making use of Lambert Beer
Law according to spectrum absorption characteristics of
deoxygenated hemoglobin (Hb) and oxyhemoglobin
(HbO2) in red and near-infrared zones.
Operation principle of this device: Photoelectric oxyhe-
moglobin inspection technology is adopted in accordance
with capacity pulse scanning and recording technology, so
that two beams of different wavelength of lights (660 nm
red and 905 nm near infrared light) can be focused onto a
Microlife OXY 200
human nail tip through a clamping finger-type sensor. A
measured signal obtained by a photosensitive element, will
be shown on the display through process in electronic
circuits and microprocessor.

4. Directions for Use

1. Insert the batteries as described in the «Inserting the
batteries» section.
2. Insert one finger (nail side up; index or middle finger is
recommended) into the finger opening of the device.
Be sure to fully insert the finger so that the sensors are
completely covered by the finger.
3. Release the device allowing it to clamp down on the
finger.
4. Press the ON/OFF button 1 to turn the device on.
5. Do not shake your finger during the test. It is recom-
mended that you do not move your body whilst taking
a reading.
6. Your measurement values will appear on the screen
after a few seconds.
7. Remove your finger from the device.
8. The device will automatically switch off after approx. 8
seconds after the finger is removed from the device.

The height of the bar graph 4 is an indication of
the pulse and signal strength. The bar should be
greater than 30 % for a proper reading.

The device must be able to measure the pulse
properly to obtain an accurate SpO
ment. Verify that nothing is hindering the pulse
measurement before relying on the SpO
measurement.

The maximum application time at a single site
should be less than 30 minutes, in order to ensure
correct sensor alignment and skin integrity.
Inaccurate measurements may occur if:
 The patient suffers from significant levels of dysfunc-
tional hemoglobin (such as carboxyhemoglobin or
methemoglobin).
 Intravascular dyes such as indocyanine green or meth-
ylene blue have been injected into the patient.
 Used in the presence of high ambient light (e.g. direct
sunlight). Shield the sensor area with a surgical towel if
necessary.
 There is excessive patient movement.
 The patient experiences venous pulsations.
 The patient has hypotension, severe vasoconstriction,
severe anemia, or hypothermia.
 The patient is in cardiac arrest or is in shock.
 Fingernail polish or false fingernails are applied.
measure-
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