WILLIAM J BERRINGER
Vehicle Board in Quakertown, PA
License number
Pennsylvania MV034537L
Category
Vehicle Board
Type
Vehicle Salesperson
Address
Address
Quakertown, PA 18951
Professional information
Myoelectrically Controlled Knee Joint Locking Device
US Patent:
5062857, Nov 5, 1991
Filed:
Jun 5, 1990
Appl. No.:
7/533430
Inventors:
WIlliam A. Berringer - Quakertown PA
Edward J. Sulima - Ambler PA
Edward J. Sulima - Ambler PA
Assignee:
Advanced Prosthestetics Development Corporation - Quakertown PA
International Classification:
A61F 264, A61F 272
US Classification:
623 25
Abstract:
A damped knee joint may be locked myoelectrically at any angle of flexing. A special hydraulic cylinder is pivoted above the knee center at one end and in the shank at the other end. This attachment strategy allows 110 degrees of knee flexion, permitting the normal range of sitting and standing positions. The cylinder assembly incorporates a closed loop, sealed hydraulic system and electro-mechanical valving to control piston position. The closed loop hydraulic system also prevents fluid leakage and contamination. Valving is accomplished by a microelectrically operated barrel or gate valve located in a hydraulic system. The use of a barrel or gate valve allows the microelectrically operated plunger to be physically isolated from the working fluid and to be operated reliably at the highest working pressure of the systems.