Foot prosthesis having cushioned ankle

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/66 (2006.01) A61F 2/60 (2006.01) A61F 2/00 (2006.01) A61F 2/50 (2006.01) A61F 2/74 (2006.01)

Patent

CA 2293486

A simple, inexpensive prosthetic foot (10) is provided incorporating a cushioned ankle including an ankle block (16) formed of a resilient material or a bladder (19) having desired compliance and energy return characteristics. The ankle block (16) or bladder (19) is sandwiched between a foot plate element (12) and an ankle plate element (14). One or more optional spring elements (18) may be embedded inside the ankle block (16) or bladder (19) to increase the rigidity of the prosthetic foot (10) and to improve the degree of energy storage and return. The shape of the spring inserts (18) is preferably one that supports compression during relative angular rotation of the ankle plate element (14) and foot plate element (12), such as during toe and heel roll, and also vertical compression, such as in response to vertical shock loads.

L'invention porte sur un pied (10) artificiel, simple et peu coûteux, dont la cheville à coussin amortisseur comporte un bloc (16) formé dans un matériau résilient ou une vessie (19) présentant les caractéristiques désirées de souplesse et de retour d'énergie. Le bloc (16) ou vessie (19) de la cheville est pris en sandwich entre un élément (12) plat du pied et un élément (14) plat de la cheville. Un ou plusieurs éléments (18) optionnels faisant ressort peuvent être encastrés dans le bloc (16) ou la vessie (19) de façon à accroître la rigidité du pied (10) artificiel et le degré de stockage et de retour d'énergie. La forme des éléments d'insertion (18) faisant ressort est de préférence une forme qui supporte la compression lors de la rotation angulaire relative de l'élément (14) plat de la cheville et de l'élément (12) plat du pied, par exemple, lors du roulement de l'orteil ou du talon, ainsi que la compression verticale, par exemple, en réaction aux charges d'impact vertical.

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