Abstract: A muscle powered liquid dispensing insert is provided for use with an implanted anchor having a hollow anchor sleeve extending into the subcutaneous fascia of a region behind an animal's ear. The insert includes one or more balloon-like reservoirs, each containing a drug or other medicant in substantially liquid form. Each reservoir means additionally provides effective means for anchoring the insert in the animal. A pump assembly draws the medicant(s) from the reservoir(s), and dispenses such to the animal. The pump assembly has a toroidal pump body defining a pump chamber and including a flexible impermeable pump diaphragm. The pump chamber communicates through inlet check valve means with each of the reservoirs, and through outlet check valve means with the tissue of the animal. The outlet check valve means operate at a higher activation pressure than the inlet check valve means. A piston powered solely by the animal's muscle and tissue operates the pump diaphragm.

Abstract: An animal insert with analog display is provided for use with an anchor inserted behind the animal's ear into a region commonly known as the Kelly triangle. The region is bounded cranially by the posterior border of the conchal cartilage and caudally by the anterior border of the cleido-occipitalis muscle. The anchor comprises an anchor flange positioned against the animal's skin, a sleeve extending into the animal and having internal threads engaging corresponding external threads on the insert, and a healing material and a plurality of barbs for retaining the anchor in the animal. The insert comprises an insert flange positioned adjacent the anchor flange, a tube extending into the animal through the sleeve of the anchor, and one or more capsules or pellets of a dissolving medicant-containing material or a liquefying diagnostic material disposed within a lower end of the tube.

Abstract: A relatively permanent barrier device which serves as a barrier to migration of foreign substances, as for example, bacteria or other disease promoting agents, through an opening in living animal tissue. The barrier device also aids in promoting healing of the animal tissue around the opening. In a preferred embodiment, the opening is designed to receive a percutaneous member or similar member for relatively permanent implant in the animal. Generally, the percutaneous member includes a stem which is insertable through the opening and into the subcutaneous facia of the animal with an enlarged head capable of overlying and engaging a portion of the barrier element. This member includes a fastening element shiftable into engagement with a portion of the animal tissue to retentively hold the member in the animal.