Hydraulic knee prosthesis
A hydraulic knee prosthesis for a leg prosthesis includes a joint unit, a foot connection unit, and a rod connecting these components. The joint unit includes a rotatory pin with a damper chamber and a damper wing screw movable therein under the control of a central hydraulic control unit.
1 . A hydraulic prosthesis comprising:
a joint unit,
a foot connection unit,
a rod connecting the joint unit and the foot connection unit, and
a hydraulic control device,
wherein the joint unit includes a rotational pin, a damper chamber, and a damper wing screw movable therein under control of the hydraulic control device.
2 . The hydraulic prosthesis as claimed in claim 1 , wherein the hydraulic control device includes a central valve unit, wherein the foot connection unit is connected to the central valve unit via a control line, and wherein deflection between parts of the foot connection unit provides a control signal via the control line to control the central valve unit.
3 . The hydraulic prosthesis as claimed in claim 2 , wherein the central valve unit controls damper and brake actions of the damper chamber by actuating different check valves.
4 . The hydraulic prosthesis as claimed in claim 1 , further comprising adjustable regulators and adjustable path limiters which allow manual control of damper properties of the prosthesis.
5 . The hydraulic prosthesis as claimed in claim 2 , further comprising adjustable regulators and adjustable path limiters which allow manual control of damper properties of the prosthesis.
6 . The hydraulic prosthesis as claimed in claim 3 , further comprising adjustable regulators and adjustable path limiters which allow manual control of damper properties of the prosthesis.
7 . The hydraulic prosthesis as claimed in claim 1 , further comprising a mechanism adapted to compensate for oil loss.
8 . The hydraulic prosthesis as claimed in claim 7 , wherein the mechanism ensures oil supply to support overpressure situations.
9 . The hydraulic prosthesis as claimed in claim 8 , wherein the mechanism includes a balancing chamber and a plunger therein.
10 . The hydraulic prosthesis as claimed in claim 2 , wherein the deflection is angular deflection.
11 . The hydraulic prosthesis as claimed in claim 5 , wherein the deflection is angular deflection.
12 . The hydraulic prosthesis as claimed in claim 1 , wherein the damper wing screw separates the damper chamber into a pair of variable volume chambers.
13 . The hydraulic prosthesis as claimed in claim 12 , wherein at least one of the variable volume chambers is connected to an accumulator facilitating joint movement.
14 . The hydraulic prosthesis as claimed in claim 1 , wherein the joint unit is a knee joint unit.
15 . The hydraulic prosthesis as claimed in claim 2 , wherein the damper wing screw separates the damper chamber into a pair of variable volume chambers.
16 . The hydraulic prosthesis as claimed in claim 15 , wherein at least one of the variable volume chambers is connected to an accumulator facilitating joint movement.
17 . The hydraulic prosthesis as claimed in claim 3 , wherein the damper wing screw separates the damper chamber into a pair of variable volume chambers.
18 . The hydraulic prosthesis as claimed in claim 17 , wherein at least one of the variable volume chambers is connected to an accumulator facilitating joint movement.
19 . The hydraulic prosthesis as claimed in claim 4 , wherein the damper wing screw separates the damper chamber into a pair of variable volume chambers.
20 . The hydraulic prosthesis as claimed in claim 19 , wherein at least one of the variable volume chambers is connected to an accumulator facilitating joint movement.