Wireless transmitter for needle electrodes as used in electromyography

Claim 1

A self-contained, battery powered, hand-held, wireless transmitter usable with a disposable mono or bipolar needle electrode to sense electrochemical nerve impulses as transmitted through the nervous system and muscles of humans and animals, said transmitter comprising a generally rectangular molded plastic case with integrally formed top, bottom, side, front and rear walls, printed circuit board means arranged between and extending parallel to said front and rear walls of said case and engaging said sides thereof, electrical circuit components and circuitry on said printed circuit board means including a high gain instrumentation signal amplifier, a signal level shifter stage, an AC amplifier, a modulator diode, a power oscillator transistor, and an antenna, said electrical circuit components and circuitry also including an input connector jack extending through and below said bottom wall of said case for frictional and electrical interconnection with a needle electrode, said transmitter also comprising battery receptor recesses in said front and rear walls of said case in which are placeable batteries for powering said electrical circuit components and circuitry, and an encapsulating medium filling the interior of said case defined by said top, bottom, side, front and rear walls thereof and encapsulating said printed circuit board means and said electric circuit components circuitry thereon.