DARAY V460S Series, User Manual & Installation Manual

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Handling
Do not detach the SpO2 sensor by pulling the cable, the SpO2 sensors are
fragile; heavy handling, pulling or throwing the devices by their cables could
severely damage the sensors and connectors
avoid undue pressure and knocks to the probe, when not in use; coil the
cable in a loose circle and store out of excessive sunlight or other high
temperature light sources
5.2 Considerations and Limits
The SpO
2
sensor is a fragile device, in a medical environment accidents do happen.
If a probe becomes damaged or the accuracy of any measurement does not seem reasonable, first
check the patient’s vital signs by an alternate method. Then check the instrument for proper
function.
The limitations of the SpO
2
sensor are the consistency and levels of the readings that are
available; this can also be impacted by its users.
Inaccurate measurements may be caused by:

Incorrect sensor application or use;

High-frequency electrical noise, such as noise from electrosurgical apparatus connected to
the system.

Significant levels of dysfunctional haemoglobin (e.g. Carboxyhaemoglobin or
Methaemoglobin); this includes small but significant concentrations of dysfunctional
haemoglobin (alternating levels)

Intravascular dyes such as indocyanine green (ICG) or methylene blue (CI 52015);

Exposure to excessive illumination, such as surgical lamps (especially ones with a xenon light
source), bilirubin lamps, fluorescent lights, infrared heating lamps, or direct sunlight
(exposure to excessive illumination can be avoided by covering the sensor with a dark
material or by storing it out of direct and persistent light sources);

Excessive patient motion;

Venous pulsations;

If Oxyhaemoglobin in the blood is too low to register a response (if this is the case
emergency action should be taken

Improper sensor installation with the monitor
 Placement of a sensor on the same extremity with a blood pressure cuff, arterial catheter,
or intravascular line.
Complete Loss of the pulse signal can occur in the following situation if:

The sensor is too tight;

There is excessive illumination from light sources such as a surgical lamp, a bilirubin lamp,
or on occasion sunlight;

A blood pressure cuff is inflated on the same extremity as the one with the SpO
2
sensor
attached;

The patient has hypotension, severe vasoconstriction, severe anaemia, or hypothermia;

There is an arterial occlusion in close proximity to the sensor;

The patient is in cardiac arrest or in shock.