Electromyography (EMG) electrodes are used to measure the bioelectrical activity occurring within a human muscle. In the last few decades, advances in electronics, especially amplifiers, have made it possible to record signals with very low amplitude.
The needle used as a sensor in electromyography (EMG) has evolved into an essential part of the recording setup. In fact, the concentric and monopolar needle electrodes, the two most common varieties of EMG needle electrodes, have hardly changed in appearance since they were first introduced in the 1940s.
In this article, we’ll go over the benefits and drawbacks of utilizing concentric and monopolar EMG needles, as well as where you can get them online.
EMG Needle Electrodes
Clinical procedures involving neuromuscular examinations frequently make use of EMG needle electrodes. The needle electrode’s naked tip acts as a sensing element. When compared to other types of electrodes, needle electrodes produce a much higher-quality signal.
There are two major benefits to using needle electrodes. For starters, the electrode’s narrow pickup area is one of the reasons it can collect action potentials from individual muscle fibers in a motor unit even at low force contractions. The other is that, following implantation, the electrodes can be moved elsewhere within the muscle to probe different areas of the tissue.
The electromyographer chooses which needle electrode to use, and it is best to use the same type every time so that the technician can get good at it.
Monopolar Needle
The monopolar needle electrode is made of stainless steel, has a pointy end that is extremely finely honed, and is entirely covered in an insulating substance, with the exception of a small exposed portion at the tip.
Pros:
Because monopolar needle electrodes have a smaller diameter and a coating, patients are more likely to prefer them. This is because there is generally less pain when dealing with a needle with less surface area.
Cons:
One of this needle’s biggest drawbacks is that it can only be used for a certain number of inspections before the bare tip size changes after continuous use. When the Teflon starts to peel, a larger area of the surface is exposed. This changes the way the motor units record the potentials.
Concentric Needle
The concentric needle is a cannula with a wire (or wires) running through it that are shielded from the outside environment.
The outer cannula serves as a reference, while the very end of the center wire acts as the active electrode. When two wires are bundled together in the center of a concentric needle, the outer cannula serves as ground, and the needle’s tip serves as both the active and reference electrodes.
Pros:
Using the concentric electrode reduces interference between the active and reference electrodes. The electrode’s range is very small, so it can only find motor units that are close by.
Cons:
Using the concentric electrode reduces interference between the active and reference electrodes. The electrode’s range is very small, so it can only find motor units that are close by.
Buy EMG Needle Electrodes Online
LifeSync offers both types of EMG needle electrodes, as well as other products, and sticks to established standards for signal quality. If you need assistance, you can check out their website or get in touch with their helpful staff.
