Abstract: An electrically operable stimulator for the control of pain or for other purposes through muscle and/or nerve stimulation by application of electrical pulses to the body of an animal, such as a human being. The stimulator generally comprises an internal power supply which may be rechargeable and which operates in conjunction with a pulse generator and an output amplifier. The pulse generator includes a unijunction transistor multivibrator and which is uniquely designed to achieve low current drain. Pulse interval and pulse width and pulse amplitude are controlled through separate and non-interacting controls. The output amplifier provides an output which is an excellent impedance match to the animal body for controlled stimulation. The output amplifier is uniquely designed to draw current only in proportion to the amount required, so that the entire apparatus is highly efficient.

Abstract: An electrically operable stimulator and method for the control of pain or for other purposes through muscle and/or nerve stimulation by application of electrical pulses to the body of an animal, such as a human being. The stimulator generally comprises an internal power supply which may be rechargeable and which operates in conjunction with a pulse generator and an output amplifier. The pulse generator includes a unijunction transistor multivibrator and which is uniquely designed to achieve low current drain. Pulse interval and pulse width and pulse amplitude are controlled through separate and non-interacting controls. The output amplifier provides an output which is an excellent impedance match to the animal body for controlled stimulation. The output amplifier is uniquely designed to draw current only in proporton to the amount required, so that the entire apparatus is highly efficient.

Abstract: An electrode for applying electrical signals to a human body from a signal generator. The electrode comprises a retaining ring formed of insulating material. The retaining ring has a rear wall integral with one end of a side wall with an opening formed in the rear wall. An inwardly extending lip is integral with the other end of the side wall and defines a front opening. An inwardly extending flange integral with and extending from the junction of the rear and side walls is generally parallel to the and spaced intermediate the lip and the rear wall to define an enlarged height annular groove and a reduced height annular groove adjacent the lip and the rear wall, respectively. A generally planar conductive plate having a first side surface and a second side surface is dimensioned to be inserted in the reduced height groove and retained therein. An electrical connector member is secured to the conductive plate first side surface and extends into the retaining ring rear wall opening.