Self-sealing injection reservoir

A self-sealing injection reservoir adapted to be surgically placed under the skin of humans or domestic animals for the purpose of having liquids injected into the reservoir or withdrawn from the reservoir by puncturing the reservoir through the skin with a hypodermic needle, the reservoir comprising:

• a substantially flat base;
• an upper portion including a substantially flat top exterior wall and cylindrical side walls, the upper portion being affixed to the base, the base and the upper portion jointly comprising a reservoir chamber for holding liquid;
• duct means in fluid communication with the reservoir chamber for permitting flow of liquid out of the reservoir chamber or into the reservoir chamber;
• a sheet of elastic material disposed within the interior of the reservoir chamber in a location suited to be pierced by the hypodermic needle and abutting the flat top, the sheet having been formed from a substantially cylindrical wall of a tubing and being held in a configuration which is flattened relative to the configuration of the wall of the tubing, the convex side of the wall of the tubing facing toward the interior of the chamber whereby the interior side of the sheet is in compression and whereby the sheet is self-sealing to punctures by a hypodermic needle, and
• guard means for guarding the base against being punctured by the hypodermic needle.

A self-sealing injection reservoir adapted to be punctured by a hypodermic neelde, the reservoir comprising:

• a body defining a chamber for holding liquid, said body included a base;
• a resilient elastic sealing member having an interior wall abutting the interior of the chamber, the interior wall of the sealing member being in compression whereby the sealing member is self-sealing to punctures by a hypodermic needle, the sealing member comprising at least an interior wall of the chamber disposed in a location of the chamber which is adapted to be punctured by the hypodermic needle;
• duct means for conducting liquid out of the chamber, and
• guard means incorporated in the chamber for preventing accidental puncture of the base with the hypodermic needle.