Patent ID: 7699808

Claim:
A site for a subcutaneous infusion device, comprising: a base positionable relative to skin of a patient; a cannula extending from the base and configured to be introduced into a subcutaneous layer of skin of the patient using a needle; and a single, unitary diaphragm coupled to the base, the single diaphragm including a closed end, an open end, and a sidewall, and the single diaphragm defining an internal reservoir in fluid communication with the cannula through the open end; wherein the single diaphragm is pierced by the needle through the upper end to introduce the cannula into the subcutaneous layer of skin of the patient; wherein the single diaphragm is pierceable through the sidewall to access the internal reservoir to deliver a substance to the patient through the cannula; wherein the base is cylindrical and further includes a top side and a bottom side and defines a central aperture located at a central axis of the base and extending through the base, and the bottom side includes an adhesive portion; wherein the base further includes a member including first and second ends, the member being positioned about the central aperture of the base and coupled to the base at the first end, an interior wall of the member defining a cavity, and the second end of the member being open; and wherein the single diaphragm is positioned in the cavity of the member and the sidewall of the diaphragm frictionally engages the interior wall of the member to retain the diaphragm in the cavity.