Digitimer Ltd - DS8R Operator’s Manual
Version 2.0
27
Digitimer Ltd.
Copyright ©2019
Electrode Fixation
Electrodes may be of the disposable self-adhesive type or reuseable taped or self-adhesive washer
fixed type. Whichever method of fixation is used, the operator should ensure that the skin is well
abraded and cleaned prior to fixation to minimise impedance. The operator should also ensure that
there is low risk of the electrode becoming detached during a stimulation protocol. Regular visual
inspection of the electrodes in parallel with checking of the patient impedance during stimulation
would be beneficial in this regard.
Electrode Dimensions
The operator should take special care when the current density of any electrode is greater than 2mA
rms / cm
2
. While electrodes with a surface area of ~1cm
2
are routinely used for peripheral nerve
stimulation, we recommend that the operator uses electrodes with the largest surface area that still
allows them to adequately stimulate particular nerves with precision.
Electrode Lead Wires
Electrode lead wires should be as short as possible in order to reduce the chance of inadvertent
trans-thoracic stimulation. We recommend use of our D185-HB4 Electrode Extension Cable as this
brings a pair of DIN 42 802-1, 1.5mm Touch Proof sockets closer to the subject so that electrode lead
wire can be shorter.
Electrode Placement
Correct electrode placement is determined by the location of the nerve or muscle that is being
studied and as such the operator should have adequate anatomical knowledge to allow for the
correct placement of stimulation and recording electrodes before proceeding to use the DS8R.
If necessary, a literature search of papers referring to peripheral nerve or muscle stimulation
methods should be conducted or further training should be sought, before undertaking any human
electrical stimulation protocols.
