Pump mechanism

A pump mechanism for connecting to a prosthetic foot, the pump mechanism comprising:

• a housing having an interior cavity;
• a one-way valve assembly connected to the housing and in fluid communication with the interior cavity;
• a first membrane located at least in part within the interior cavity;
• a first connector engaging the first membrane and protruding outside the interior cavity;
• a first movable member connected to the first connector and arranged to engage the prosthetic foot, wherein relative movement of the first movable member against the prosthetic foot pulls the first membrane by the first connector to draw fluid through the one-way valve assembly;
• a second membrane located at least in part within the interior cavity;
• a second connector engaging the second membrane and protruding outside the interior cavity;
• a second movable member connected to the second connector and arranged to engage the prosthetic foot, wherein relative movement of the second movable member against the prosthetic foot pulls the second membrane by the second connector to draw fluid through the one-way valve assembly;
• and
• wherein the first and second membranes are located on opposite sides of the housing, and the first and second connectors connecting to the first and second movable members.

A pump mechanism for connecting to a prosthetic foot, the pump mechanism comprising:

• a housing having an interior cavity;
• a one-way valve assembly connected to the housing and in fluid communication with the interior cavity;
• a first membrane located at least in part within the interior cavity and formed by an elastomeric material;
• a first connector engaging the first membrane and protruding outside the interior cavity, the first connector including an upper radial flange above the first membrane, a lower radial flange embedded in the first membrane, and a shaft portion extending between the upper and lower radial flanges;
• a first movable member connected to the first connector and arranged to engage the prosthetic foot, the first movable member being a plate including a first portion connecting to the prosthetic foot, and a second portion connecting to the housing, the first movable member having a radius of curvature adapted to vary according to movement by the prosthetic foot;
• and
• wherein the pump mechanism is arranged so that when prosthetic foot is in a resting position, the first membrane is in an original configuration, wherein upon heel strike, the prosthetic foot moves into expansion, which, in turn, moves the first membrane to an expanded configuration by the radius of curvature of the first movable member increasing upon heel strike.