Embodiments of the invention generally relate to needles having more than
one electrode and which are particularly suited for use in
electromyography. One embodiment relates to a tripolar needle having
three concentric electrodes. The tripolar needle is formed by providing a
needle blank having first and second concentric electrodes and forming a
third concentric electrode around the needle blank. The tripolar needle
has an outer diameter which is substantially constant along the shaft of
the needle, except at the tip, where the needle is sharpened.