Patent ID: 7988616

Claim:
An implantable pump for pumping hydraulic fluid to or from a hydraulically operable surgical implant inside a human's or an animal's body, the pump comprising: a wall forming a chamber for the hydraulic fluid, the wall including a first wall portion and a second wall portion, which is displaceable relative to the first wall portion to change the volume of the chamber to pump the hydraulic fluid between the chamber and the surgical implant, the second wall portion including a displaceable membrane that is penetrable by an injection needle to add hydraulic fluid to, or withdraw hydraulic fluid from the chamber, the membrane being self-sealing to seal the hole which is formed in the membrane by the penetrating injection needle, the membrane being displaceable relative to the first wall portion between a first position, in which the chamber has a first volume, and a second position, in which the chamber has a second volume smaller than the first volume, and a locking device adapted to releasably lock the membrane in the second position, the locking device being adapted to lock the membrane in the second position, when the membrane is manually pushed from the first position to the second position, the locking device being adapted to release the membrane from the second position upon pushing the membrane, and the membrane is adapted to resume its first position, when it is released from the second position.