24
25
Fig.4.8
Inaccurate measurements may be caused by
•
Significant levels of dysfunctional hemoglobin (such as carbonyl -
hemoglobin or methemoglobin);
•
Intravascular dyes such as indocyanine green or methylene blue;
•
High ambient light. Shield the sensor area if necessary;
•
Excessive patient movement;
•
High-frequency electrosurgical interference and defibrillators;
•
Venous pulsations;
•
Placement of a sensor on an extremity with a blood pressure cuff,
arterial catheter, or intravascular line;
•
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;
•
Weak pulse quality (low perfusion);
•
Low hemoglobin;
Maintenance and Cleaning
WARNINGS!
•
Disconnect the AC power before cleaning the monitor or sensor.
Note:
1. Remember to save the settings or you can cancel the settings.
2. Press default, all settings will be reset to factory defaults, please be
carefully.
Measurement principle
Principle of the oximeter is as follows: A mathematical formula is
established making use of Lambert Beer Law according to Spectrum
Absorption Characteristics of Reductive hemoglobin (RHb) and
Oxyhemoglobin (HbO2) in glow and near-infrared zones. Operation
principle of the instrument: Photoelectric Oxyhemoglobin Inspection
Technology is adopted in accordance with Capacity Pulse Scanning
and Recording Technology, so that two beams of different wavelength of
lights (660nm glow and 905nm near infrared light) can be focused onto a
human nail tip through a clamping finger-type sensor. A measured signal
obtained by a photosensitive element, will be shown on the oximeter’s
display through process in electronic circuits and microprocessor.
Measuring
a.Power on the device
b.Before starting a measurement, verify that you have selected a
suitable size sensor for the patient.
c.Connect the end of sensor to the device, the other end to the patient
measured finger, as shown in Fig.4.7
Fig.4.7
Place the measured finger into the probe. Several minutes later, the
result will display on the screen as shown in Fug.4.8