Self-sealing injection reservoir

摘要

An injection reservoir or button is adapted for implantation beneath the skin of human and animal patients in conjuction with tissue expanders and drug delivery devices. The injection reservoir includes a base and an exterior wall which define a chamber of liquid reservoir. A duct connects the chamber with an expandable bag of the tissue expander. An elastic rubber member is affixed within the interior of the chamber to act as a sealing member. The rubber member is an inverted dome and is self-sealing to needle punctures because it has a concave interior side which is under compression as a result of having been manufactured into a substantially dome-shaped configuration and thereafter inverted. A metal guard plate is included within the interior of the chamber to guard the base against accidental puncture by an over extended hypodermic needle.