Patent ID: 7735501

Claim:
A mobility assistance apparatus comprising; in combination: a walking aid being selected from a group consisting of a crutch, a cane, and a walker; and a device connected to a lower portion of the walking aid for ground engagement, the device having a dynamic response characteristic to forces associated with ambulating using the walking aid which generates forward propulsion to aid mobility; wherein the device includes a resilient foot, an ankle and a shank which store energy during force loading and release stored energy during force unloading to generate propulsive force, the shank being generally rectangular in shape with a side to side width being greater than an anterior posterior thickness, the shank having a lower end which is anterior facing convexly curved, an elongated portion extending upward from the curved lower end, and a substantially curvilinear, substantially vertically oriented upper end, and wherein the curved lower end is coupled to the resilient foot, and the upper end is connected to the lower portion of the walking aid.