Best Practices

Guidance procedures require a quality hypodermic needle electrode and two surface electrodes.

  • The hypodermic needle electrode plugs into the black connector
  • One surface electrode is connected to the green connector which is for the ground,
  • The second surface electrode connects to the red connector which is for the reference. 

It is important to keep the leads on all the electrodes as short as possible to avoid having long unshielded electrode paths.  These are noise magnets, as they are part of the high impedance pathway and best kept short.

The benefit of Myoguide is the use of a guarded and shielded input cable that protects the signal from stray noise pickup, supporting the use of shorter unshielded leaded electrodes, or alligator clipped tab, or snap surface electrodes, while maintaining a useable length.

We would like to present the following guidelines to ensure you have the best possible situation for measuring great EMG signals from the hypodermic needle electrode to support your injection guidance procedures:

  • The hallmark we all need to embrace is that we need “Fresh Surface Electrodes!” “oldies are not goodies”.
  • Avoid using surface electrodes that have been sitting in an open package laying around without any knowledge of when the package was opened. (Surface electrodes will keep for a 2-3 weeks once the foil package has been opened).
  • Please don’t use old electrodes, as they will affect the quality of the EMG signal and the ability to deliver stimulation.

Let’s address the placement of the surface electrodes to help us collect the best possible signals. Some simple pre-planning will gain best results for the entire procedure if one area is being treated. These simple principles will help you create the best opportunities to collect great signals:

  • No real need to move the reference and ground electrodes if all the injection sites are close by. Most times only the reference electrode needs to be moved if there are bilateral injections.
  • Avoid placing electrodes in areas that will see ultrasound goop! This will avoid short circuits and peeling surface electrodes.