Abstract: An electromyography needle electrode having an inner core and an outer elongated cannula surrounding the inner core, wherein the inner core includes tungsten. The inner core may comprise at least 99.95 percent tungsten. The outer elongated cannula forms an outer conductive electrode and the inner core forms an inner conductive electrode. At least one insulating layer may be formed between the outer elongated cannula and the inner core. The impedance of the anode and cathode may be matched more closely.

Abstract: A monopolar needle probe for measurement of electrical activity in a patient. The needle probe has a nonconductive sheath and a conductive needle within the nonconductive sheath. The conductive needle has a longitudinal axis. An end of the needle is exposed from the nonconductive sheath and the end defines a plurality of substantially planar and symmetrical surfaces.

Abstract: A needle (1) and needle probe are provided. The needle (1) has a conducting inner core (12) separated for a conducting outer cannula (14) by an insulating element (16). A first end of the needle is for insertion into a patient, whereas the second end (6) is adapted for electrical connection to the remainder of the instrument. The second end (6) is formed in a substantially conical or substantially pyramidal shape. The inner core (12) at the second end contacts a contact plate (45) of a spring contact probe (22) to provide one electrical contact. To provide the other electrical contact, the outer cannula (16) at the second end is connected to an inner wall (18) which contacts spring fingers (51) mounted around the spring contact probe (22).