MyoTrac Infiniti
™
User Guide
32
Chapter 3
Stim sessions on your MYOTRAC INFINITI™
Encoder
What is a Stim session?
A Neuromuscular Electrical Stimulation (NMES) session is used in order to stimulate muscle
contraction. During a stim session an electrical impulse is delivered to targeted muscles via
electrodes which cause the active motion in the muscles. Stimulation can be used for muscle rehab
as well as for incontinence treatment. Each of these can be run in two formats: Open Sessions or
Script Sessions. Data is not recorded during a stimulation session as no EMG is recorded.
Features of a Stim session
Below is a typical waveform for a stimulation pulse. There are a number of variables that can be
controlled when running a stimulation session based on your clinical objectives. These can be
manually adjusted or a pre-specified set can be selected by using a Script.
Pulse Width
– The duration of each individual pulse.
Pulse Rate
- The rate at which a number of pulses are delivered.
Intensity
– The intensity in mA that is delivered by each pulse. The maximum available
intensity is 100mA, determined with an input impedance of 500
. The maximum intensity that
you could use is determined by the electrode size that you are using and may be less than
100mA.
Ramp
– The time it takes for the intensity of successive pulses to reach the preset maximum
or back to zero from the start or the end of a series of pulses.
As can be seen from the diagram above of a single stimulation pulse the stim is balanced thus
there is no DC component. This means that during stimulation session there is no residual build up
of energy at the electrode site.
One safety feature of the MyoTrac Infiniti is a “client detect”, that detects the connection of the
electrodes to the user. If there is not a good electrical connection the unit will not permit the stim to
start. Test this periodically by disconnecting the client cable and trying to increase the stim
