Patent ID: 7708784

Claim:
A lower extremity prosthesis comprising: a longitudinally extending foot keel, said foot keel comprising a longitudinally extending, semi-rigid, resilient member having a forefoot portion at one end, a hindfoot portion at an opposite end and a relatively long midfoot portion extending between said forefoot and hindfoot portions; a resilient, monolithically formed, S-shaped shank having a lower end connected to the foot keel and extending upwardly from the foot keel by way of an anterior facing convexly curved portion of the shank forming an ankle joint area of the prosthesis, the shank extending upwardly in a substantially reversely curved manner above the ankle joint area to an anterior facing concavely curved portion of the shank above the ankle joint area to connect with a lower extremity prosthetic socket on a person's leg stump, the width of the shank in the frontal plane of the prosthesis being greater than the thickness of the shank in the sagittal plane along the length of the shank such that the upper end is moveable longitudinally of the foot keel in response to force loading and unloading of the shank during use of the prosthesis; and a fastening arrangement connecting and securely positioning the lower end of the shank to the foot keel.