Therapeutic Technologies Inc.

Mauch, Inc.

Electrologic of America, Inc.

Steven H Petrofsky

Christian H Reinke

William G Gruesbeck

A computer controlled hydraulic resistance device for apparatus such as a prosthetic knee for above knee amputees, includes a two stage pilot operated solenoid valve connected to control the flow of hydraulic fluid to and from a hydraulic actuator which applies resistance to the prosthetic knee or other apparatus through a coupling. Hydraulic pressure is sensed on the high and low side of the actuator by a spring biased magnet and a magnetically actuated electronic sensor and is used by a micro-controller in a closed-loop manner to compensate automatically for variations in the device and in the hydraulic fluid viscosity. The device also has magnetically actuated electronic sensors which sense positions of the apparatus and feed back to the micro-controller for applying a predetermined resistance profile to the apparatus.

Computer controlled hydraulic resistance device for a prosthesis and

A method and apparatus are provided for a therapy current to be applied for treatment for increasing circulation and allowing for rapid healing of injured tissue, tendon, or muscle areas. The apparatus applies a therapeutic current to the area of injury with little or no discomfort using three or four associated channels of electrical stimulation with a novel waveform and channel interaction.

Electrical stimulation therapy method and apparatus

A computer controlled hydraulic resistance device for apparatus such as a prosthetic knee for above knee amputees, includes a solenoid actuated valve connected to control the flow of hydraulic fluid to and from a hydraulic actuator which applies resistance to the prosthetic knee or other apparatus through a coupling. Hydraulic pressure is sensed on the high and low side of the actuator and is used by a micro-controller in a closed-loop manner to compensate automatically for variations in the device and in the hydraulic fluid viscosity. The device also senses the position of the apparatus and feedsback to the micro-controller for applying a predetermined resistance profile to the apparatus.

A method and apparatus are provided for electrically stimulating muscle of individuals having little or no nerve damage so the muscle can be power contracted with little pain to the individual. A therapeutic current is applied to the muscle which includes alternating desensitizing and stimulus currents. The desensitizing current is a high frequency, low amplitude current to desensitize the muscle and the stimulus current is a low frequency, high amplitude current to stimulate the muscle. The currents alternate at a point where the amplitude and slope of the two currents are substantially identical to avoid abruptions in the current. An onset failure monitor circuit is also provided to detect an increase in skim/electrode impedance indicative of possible subsequent failure of the skin-electrode connection or electrode failure.

Power muscle stimulator

An electrical muscle stimulator is disclosed which provides unloaded isometric exercise of a pair of antagonist muscles associated with a rotatable limb, substantially without creating torque at the rotating joint. Further, a reduced pain stimulus signal is disclosed characterized in that it is continuous, biphasic and camel-back during a fundamental period thereof.

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Dayton, OH, United States of America

Steven H Petrofsky