Abstract: Some embodiments include a flexible, pressure-balanced cable assembly. The cable assembly has a tubular-shaped flexible outer sleeve that surrounds an electrical cable. A plurality of seals is positioned along the length of the flexible sleeve within the space formed between the inner surface of the flexible sleeve and the outer surface of the electrical cable. The seals partition the space into a plurality of individual chambers. Each chamber is filled with dielectric fluid. The seals are independently and bi-directionally movable in response to a pressure difference between the inside of the cable assembly and the external environment thereby balancing the pressure between the inside of the cable assembly and the external environment.

Abstract: A flexible, pressure-balanced cable assembly is provided. The cable assembly comprises a tubular-shaped flexible outer sleeve that surrounds an electrical cable. A plurality of seals is positioned along the length of the flexible sleeve within the space formed between the inner surface of the flexible sleeve and the outer surface of the electrical cable. The seals partition the space into a plurality of individual chambers. Each chamber is filled with dielectric fluid. The seals are independently and bi-directionally movable in response to a pressure difference between the inside of the cable assembly and the external environment thereby balancing the pressure between the inside of the cable assembly and the external environment.

Abstract: A prosthetic knee joint mechanism has an hydraulic load-activated knee-stabilising device for resisting joint flexion. A rotary piston connected to one part of the mechanism is rotatable within a fluid-filled fluid displacement chamber associated with another part of the mechanism to drive fluid through a fluid passage which contains a main valve which restricts or allows joint flexion according to the position of a valve member within the valve. The valve member is movable towards an open position in response to fluid pressure in the fluid passage upstream of the valve member caused by application of a flexion torque to the knee joint mechanism, movement of the valve member in the direction of the open position being at least resisted by a valve control arrangement actuated by application of the wearer's weight. The weight-responsive valve control arrangement is preferably a weight-responsive pilot valve for hydraulically resisting movement of the valve member of the main valve.