User Manual ToFscan
13
‘Big Toe’ sensor
The positioning must allow the free movement of the sensor. The sensor cable exert no
tension on the sensor. The sensor is fixed with a medical tape to the patient’s big toe. It is essential to
note that the toe and ankle of the patient must be free to move.
Position of the ‘big toe’ sensor
on the patient’s toe
Single-use hand sensor
The user will position the disposable sensor on the patient’s hand according to the
instructions on the packaging. Ensure that the sensor does not exert excessive pressure on the
patient’s skin or impede the blood circulation of the fingers (avoid excessive tightening of the
fingers, hand or any other patient limbs by the adhesives of the sensor). The integrated electrodes
will be positioned on the path of the ulnar nerve at the wrist area inside the arm.
After positioning the disposable sensor on the patient’s hand, the sensor will be connected
to the ToFscan cable (TOF-CS1) itself connected to the ToFscan.
Positioning of the
disposable hand sensor
and its electrodes
Notes:
While the device is being operated, the user should check that the sensor must keep the
same position as the one from the initial set-up. The same applies for the patient’s arm, leg or head
which should not change position for the duration of the monitoring process.
If the ‘Thumb’ sensor does not fit nicely the hand, it can be fixed with medical adhesive tape to be
maintained in an ideal position. The user can immobilize the last three fingers with an adhesive strap
to improve the thumb range of motion and obtain more precise measure during the monitoring of
the thumb.
In the case of the thumb sensor, check that the splint part of the
sensor or the ring around the index finger does not cause pressure or excessive stress,
an adhesive positioning (see image «Positioning by adhesive») can then be put in place.
After a certain period of use of the sensor, a slight mark or redness of the skin in the
contact area with the sensor may appear. This mark or redness is due to the presence of the
sensor in contact with the skin. This must remain limited, harmless and not look like an injury.
Skin impedance
The ToFscan is an electrical stimulator with a constant current. Therefore, irrespective of
skin impedance it will stimulate the patient with an identical current. It will function in this way so long
as the needed voltage is below 300 V. Because of this limit you need to have a good skin impedance.
For example, to get a 60 mA current through a resistive charge the maximum impedance should
be equal to 5 Kohms. The skin impedance is more complex than a simple resistive charge and the
ToFscan will help you getting a good impedance with a colored electrodes symbol.
Only the green symbol
allows to use in good condition the ToFscan. With yellow symbol
the intensity of electric stimulation may be lower than expected.
If the symbol is red
the ToFscan doesn’t provide electric stimulations.
If you get the screen below it is necessary to check or modify the patient’s connection to the
electrodes.
