Combined active and passive leg prosthesis system and a method for performing a movement with such a system
First Claim
1. A lower limb prosthesis for replacing a missing lower extremity of an individual, said lower limb prosthesis comprising:
- a prosthetic foot member; and
an ankle module configured to be interposed between the prosthetic foot member and a lower limb member, the ankle module comprising an actuator consisting of a hydraulic assembly including at least one hydraulic cylinder and at least one piston configured to move axially within the at least one hydraulic cylinder as the prosthetic foot member moves relative to the lower limb member such that movement of the at least one piston within the at least one hydraulic cylinder adjusts an angle of the prosthetic foot relative to the lower limb member,wherein the hydraulic assembly imparts a force onto the at least one piston during a swing phase in gait to thereby dorsiflex the prosthetic foot relative to the lower limb member.
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Accused Products
Abstract
A lower limb prosthesis system and a method of controlling the prosthesis system to replace a missing lower extremity of an individual and perform a gait cycle are disclosed. The prosthesis system has a controller, one or more sensors, a prosthetic foot, and a movable ankle joint member coupled to the prosthetic foot. The movable ankle joint member comprises a hydraulic damping system that provides the ankle joint member damping resistance. The controller varies the damping resistance by providing volumetric flow control to the hydraulic damping system based on sensor data. In one embodiment, the hydraulic damping system comprises a hydraulic piston cylinder assembly, hydraulic fluid, and a valve to regulate the fluid. In one embodiment, the controller alters the damping resistance by modulating the valve to vary the hydraulic fluid flow within the hydraulic piston cylinder assembly of the movable ankle joint member based on sensor data.
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Citations
8 Claims
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1. A lower limb prosthesis for replacing a missing lower extremity of an individual, said lower limb prosthesis comprising:
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a prosthetic foot member; and an ankle module configured to be interposed between the prosthetic foot member and a lower limb member, the ankle module comprising an actuator consisting of a hydraulic assembly including at least one hydraulic cylinder and at least one piston configured to move axially within the at least one hydraulic cylinder as the prosthetic foot member moves relative to the lower limb member such that movement of the at least one piston within the at least one hydraulic cylinder adjusts an angle of the prosthetic foot relative to the lower limb member, wherein the hydraulic assembly imparts a force onto the at least one piston during a swing phase in gait to thereby dorsiflex the prosthetic foot relative to the lower limb member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification