Patent ID: 7066964
Filing Date: 2006-06-27
Classification: A61F

Abstract:
1. A polycentric prosthetic knee joint for use in connecting an upper leg prosthesis to a lower prosthetic leg comprising: a housing with an upper joining section for connection with the upper leg prosthesis, and a lower section having an arcuate channel therein with a bumper at the forward portion of said channel; a forward link having a first end pivotable about a first center of rotation on the lower section of the housing, a pin protruding from the forward link into the arcuate channel, and a second end pivotable about a second center of rotation on a chassis connected to the lower prosthetic leg; a rear link having a front end pivotable about a third center of rotation located on the housing rearward of the first center of rotation, and a second end pivotable about a fourth center of rotation located on the chassis rearward of the second center of rotation; wherein the bumper in the channel resists the pin on the forward link against forward movement for up to between 10° and 20° of forward flexion by the prosthetic knee joint.