Patent ID: 7524300

Claim:
An infusion device comprising: a body having a body passageway, a top, and a bottom surface, the body having an outermost perimeter; an adhesive layer attached to the bottom surface; a cannula coupled to the body and having a portion extending from the body and being positioned such that any portion of the cannula that is above a patient's skin when the infusion device is used is positioned within the outermost perimeter, the cannula also having a cannula passageway defined at least in part by a cannula passageway wall that has a greatest cannula passageway wall width, an upper cannula passageway wall portion that will not be in direct contact with medication delivered through the infusion device and into a living being when the infusion device is used, and a lower cannula passageway wall portion that will be in direct contact with medication delivered through the infusion device and into a living being when the infusion device is used; a self-sealing septum that is separate from but coupled to the body, the septum having a septum bottom surface that includes a septum bottom surface portion that is exposed to open space that is (a) upstream of and in fluid communication with the lower cannula passageway wall portion and (b) within the body passageway, the septum also having a septum top surface that includes a septum top surface portion accessible to an injection needle, the septum top surface portion being defined by a septum top surface portion perimeter having a greatest width that is greater than the greatest cannula passageway wall width of the cannula; and an inner surface that directly borders open space within the body passageway that is downstream of the septum and upstream of the lower cannula passageway wall portion, the inner surface having an inwardly-tapered portion.