Prosthetic device, system and method for increasing vacuum attachment

A prosthetic system comprising:

• a prosthetic foot including a foot plate defining an upper surface and having a flexible configuration;
• a prosthetic socket connected to the prosthetic foot;
• and
• a pump system in fluid communication with the prosthetic socket and attached to the prosthetic foot, the pump system including a pump mechanism defining a fluid chamber having a variable configuration and an actuating part, the actuating part arranged to selectively engage with the foot plate by coming into contact with the foot plate, and separate a distance from the upper surface of the foot plate by moving away from the foot plate to move the pump mechanism between a first position in which a volume of the fluid chamber is zero or near-zero and a second position in which the volume of the fluid chamber is expanded relative to the first position to draw fluid into the fluid chamber from the prosthetic socket,
• wherein the volume of the fluid chamber increases when the actuating part moves away from the upper surface of the foot plate;
• wherein the volume of the fluid chamber increases as the prosthetic foot moves from a heel strike toward a foot strike.