Patent ID: 8771372

Claim:
A prosthetic device, said prosthetic device comprising: (a) an upper leaf spring member, said upper leaf spring member having an upper end and a lower end; (b) a wave leaf spring member, said wave leaf spring member having a toe end and a heel end and said wave leaf spring member disposed below the upper leaf spring member; (c) a third leaf spring member, said third leaf spring member having a length, a first end and a second end and said third leaf spring member disposed below the wave leaf spring member; wherein the toe end of the wave leaf spring member is fixedly attached to the upper leaf spring member at the lower end and the third leaf spring member at the first end; and wherein the heel end of wave leaf spring member is in continuous surface contact with the third leaf spring member regardless of loaded or unloaded states of the device and slidingly deflected along the third leaf spring member; and wherein the wave leaf spring member extends along a substantial portion of the length of the third leaf spring member.