Patent ID: 7338465

Claim:
An infusion device comprising: a body having a body passageway, a top, a bottom surface, an accessible surface that generally gets broader from the top to the bottom surface, and an outer perimeter that is larger at the bottom surface than at the top; a cannula having a portion extending perpendicularly 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 outer perimeter of the body, the cannula having an inner surface that defines a cannula passageway, the inner surface including (a) a first portion that cannot be in direct contact with medication delivered to a patient when the infusion device is used and (b) a second portion that can be in direct contact with medication delivered to a patient when the infusion device is used; and a self-sealing septum that limits contaminants entering the body passageway, the self-sealing septum having a septum bottom surface and being positioned such that an injection needle that penetrates the self-sealing septum to deliver medication to a patient and that exits the septum bottom surface will exit the septum bottom surface into open space that is (a) upstream of the second portion of the inner surface, (b) within the body passageway, and (c) in direct communication with the cannula passageway; the infusion device being configured such that (a) the infusion device can be installed to a patient using a needle that has passed through the body passageway and the cannula passageway and (b) at least a portion of the infusion device will be exposed above a patient's skin when the infusion device is used.