Patent ID: 8246695
Filing Date: 2012-08-21
Classification: A61F

Abstract:
1. An artificial foot comprising: a connecting part for establishing a connection to a lower leg part; a base foot part pivotably connected to the connecting part via an ankle joint, wherein said base foot part includes a heel section which extends rearward of the ankle joint and a midfoot section which extends forward of the ankle joint; a linking rod pivotably connected to the connecting part and extending forward of the ankle joint; a forefoot part, said forefoot part either being pivotably connected to the midfoot section of the base foot part or connected to the midfoot section of the base foot part by a flexible connection region effectively forming a hinged connection, and said forefoot part being pivotably connected to the linking rod, wherein said midfoot section and said linking rod being configured to form an articulated connection with said connecting part and said forefoot part that during a walking process transmits an angular position of the connecting part relative to the base foot part in a proportional manner to an angular position of the forefoot part relative to the base foot part so that a change in the angular position of the connecting part in a rearward direction leads to a proportional lifting of the forefoot part and the forefoot part is pressed downward if the connecting part is tilted forward relative to the base foot part, wherein the articulated connection is a four-joint arrangement which includes said connecting part, said midfoot section, said linking rod, and said forefoot part, wherein a length of either said midfoot section or said linking rod between said connecting part and said forefoot part in said articulated connection is adjustable, and wherein said four-joint arrangement is configured such that during the walking process when the artificial foot rolls forward across the forefoot part, a digging in of the forefoot part is avoided by allowing a change of said length between said connecting part and said forefoot part in said articulated connection so as to reduce a transmission factor of the angular positions of the connecting part and the forefoot part.