Implantable penile prosthesis pump

A penile prosthesis comprising:

• at least one cylinder;
• a reservoir;
• and
• a pump for transferring fluid between the reservoir and the at least one cylinder, the pump comprising:
• a pump housing;
• at least one reservoir channel fluidly coupling the pump housing to the reservoir;
• at least one cylinder tube fluidly connecting the pump housing to the at least one cylinder;
• a fluid passageway fluidly coupled to the at least one cylinder tube and a transfer chamber and comprising a flange extending toward its interior, wherein the transfer chamber is fluidly coupled to the reservoir channel;
• a first poppet biased toward a first valve seat within the fluid passageway and comprising an elongated body having an extending face seal portion for engagement with the flange of the fluid passageway when the first poppet is displaced by a sufficient distance from the first valve seat;
• a second poppet biased toward a second valve seat, biased away from the first valve seat, and generally in alignment with the first poppet within the fluid passageway, wherein the fluid passageway further comprises a lip seal portion that extends generally from the second poppet toward the first poppet, wherein the first poppet is slideably moveable into contact with the lip seal to prevent fluid from moving between the pump bulb and the fluid passageway adjacent the second poppet;
• a bypass chamber fluidly connected by a bypass input channel to the fluid passageway at a first location that is located on a side of the lip seal adjacent the second poppet and fluidly connected by a bypass output channel to the fluid passageway at a second location that is located on a side of the lip seal that is further from the second poppet than the bypass input channel, the bypass chamber comprising a bypass check valve biased toward a closed position;
• and
• a pump bulb fluidly connected to the fluid passageway between the bypass input channel and bypass output channel along the length of the fluid passageway;
• wherein the pump has a deflation mode in which compression of a portion of the pump body moves the first poppet into sealing contact with the lip seal portion and the second poppet to unseat the second poppet from the second valve seat to provide a gap between the second poppet and the second valve seat for pressurized fluid to flow from the at least one cylinder past the second poppet and into the bypass chamber through the bypass input channel.