Idmed Algiscan, User Manual

Page: 16 / 40

User Manual AlgiScan 16
Taking a measurement
Positioning of the device and detection of the pupil
Positioning the device on the patient’s face is an important step to obtain reliable
measurements (see: “Installation and positioning of the AlgiScan” section).
If the patient is conscious, ask him/her to keep his/her head straight, open the filmed
eye wide and look straight ahead without blinking. The other eye is closed.
If the patient is unconscious or not able to cooperate, the operator may need to
raise and/or lower the patient’s eyelids so that the pupil measured by the AlgiScan appears
completely unobstructed.
The patient’s pupil should be centered on the screen and totally in green color.
Only the pupil will be colored in the image displayed by the AlgiScan. If this is not the case,
reposition or position differently the AlgiScan.
It is important when measuring a very small pupil to position the AlgiScan so that the
white spots (reflections of the infra-red diodes) do not deform the detected pupil contour. If
this is the case reposition the AlgiScan or position it differently.
NO
White spots deform the pupil
YES
Correct positioning and
detection of the pupil
NO
Poor pupil detection
When the pupillometer is ready for a measure the following icon will appear at the
bottom right of the video image.
Note: when the pupil detection is not correct, the red icon will appear at the bottom right of the
video image. The pupillometer does not detect the pupil in the video image.
Do not move the AlgiScan when taking measurements
Taking a measurement
Once the device correctly positioned, the AlgiScan displays the green icon when the pupil
is detected. It is necessary to ensure that the size of the pupil is stable before taking the
measurement.
Start taking the measurement by pressing continuously on the main button until the
countdown at the bottom right corner of the screen reaches 0.
A beep will indicate the start and end of the measurement period. In “Flash” mode, at
the end of the measurement, the user can record the patient’s eye used for the measurement
(right or left).
Bilateral Pupil Exam: If a measurement on the other eye is done within 2 minutes of
the first one, a comparison chart of the bilateral pupil exam will be displayed.
Hold function
When a mode (“Flash”, “Tetanus”, “PPI” or “PRD”) is selected, it is possible to freeze the analysed
image of the pupil by putting the AlgiScan on pause. To do this, press the video image for a
long time, which freezes the measured pupil value as well as the filmed image. Press again on
to deactivate the pause mode.