Pump system

A prosthetic system comprising:

• first and second parts rotatable relative to one another about a joint, the first and second parts adapted to form at least part of a weight bearing connection between a prosthetic foot and a socket, the first part defining an upper section arranged to connect to the socket and the second part defining a lower section arranged to connect to a prosthetic foot, the second part being spaced apart from the first part by a clearance;
• and
• a pump system including:
• a pump mechanism operatively connected to the first and second parts such that relative rotation between the first and second parts about the joint moves the pump mechanism between a predetermined configuration in which a volume of a fluid chamber defined by the pump mechanism is zero or near-zero, and an expanded configuration in which the volume of the fluid chamber is increased, the pump mechanism including a housing, a membrane, and at least one valve assembly arranged to control movement of fluid into and/or from the pump mechanism;
• a movable member including a first end portion connected to the membrane and a second end portion connected to the first part;
• wherein when the first and second parts are in the predetermined configuration, the first and second parts are aligned along a same axis defined by the weight bearing connection and extending from the prosthetic foot to the socket.