Brake-action knee joint
First Claim
1. A brake-action knee joint for a leg prosthesis, comprising:
- an upper prosthetic part;
a lower prosthetic part;
a joint pin which includes a rotary piston and which is connected in a torsionally rigid fashion to the upper part of the joint;
a rocker which forms a central part of the joint, the rocker having an extension-side end fixed to a rocker pin lying parallel, ventrally and distally with respect to the joint pin and having a flexion-side end, wherein the rocker surrounds the joint pin; and
a braking device activated by foot loading, which includesa closed, fluid-filled displacer chamber;
a valve plunger having an open position and a closed position;
a valve-plunger spring; and
a first adjusting device mounted on the lower prosthetic part of the joint and connected to the valve plunger;
wherein the displacer chamber concentrically surrounds the joint pin over its circumference, at least partially and is arranged in an associated end of the central part of the joint,wherein the rotary piston divides the displacer chamber into an extension chamber and a flexion chamber, which are connected to one another by way of an oil line which can be completely or partially closed by the valve plunger;
and wherein the valve plunger is mounted in the central part of the joint in such a way as to be displaceable counter to the action of the valve-plunger spring pushing it into its open position and, when the central part of the joint is pivoted in the direction of flexion about the rocker pin, is pushed into its closed position by the adjusting device.
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Accused Products
Abstract
A brake-action knee joint for a leg prosthesis includes a closed displacer chamber which concentrically surrounds the joint pin over its circumference, at least partially, is preferably filled with hydraulic oil, and is arranged in the associated end of the central part of the joint. The joint pin is designed as a rotary piston and is connected in torsionally rigid fashion to the upper part of the joint. The joint pin divides the closed displacer chamber into an extension chamber and a flexion chamber, which are connected to one another by way of an oil line which can be completely or partially closed by a valve plunger. The valve plunger is mounted in the central part of the joint in such a way as to be displaceable counter to the action of a valve-plunger spring pushing it into its open position and, when the central part of the joint is pivoted in the direction of flexion about the rocker pin arranged in the lower part of the joint, is pushed into its closed position by an adjusting device provided in the lower part of the joint.
143 Citations
16 Claims
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1. A brake-action knee joint for a leg prosthesis, comprising:
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an upper prosthetic part; a lower prosthetic part; a joint pin which includes a rotary piston and which is connected in a torsionally rigid fashion to the upper part of the joint; a rocker which forms a central part of the joint, the rocker having an extension-side end fixed to a rocker pin lying parallel, ventrally and distally with respect to the joint pin and having a flexion-side end, wherein the rocker surrounds the joint pin; and a braking device activated by foot loading, which includes a closed, fluid-filled displacer chamber; a valve plunger having an open position and a closed position; a valve-plunger spring; and a first adjusting device mounted on the lower prosthetic part of the joint and connected to the valve plunger; wherein the displacer chamber concentrically surrounds the joint pin over its circumference, at least partially and is arranged in an associated end of the central part of the joint, wherein the rotary piston divides the displacer chamber into an extension chamber and a flexion chamber, which are connected to one another by way of an oil line which can be completely or partially closed by the valve plunger; and wherein the valve plunger is mounted in the central part of the joint in such a way as to be displaceable counter to the action of the valve-plunger spring pushing it into its open position and, when the central part of the joint is pivoted in the direction of flexion about the rocker pin, is pushed into its closed position by the adjusting device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification