Patent ID: 8157773

Claim:
An infusion device comprising: an infuser base having a bore extending therethrough, the bore having distal and proximal ends and including a shoulder therebetween; a cannula having distal and proximal ends, the cannula proximal end having an inside diameter, with a flange extending radially outward from the cannula proximal end, the cannula being positioned in the bore such that the flange is positioned adjacent the shoulder; and a ferrule having a ferrule insertion portion, having an outside diameter which is substantially equal to the cannula proximal end inside diameter, and a ferrule tapered portion extending from the ferrule insertion portion with an increasing outside diameter, the ferrule being positioned in the bore such that the ferrule insertion portion and a portion of the ferrule tapered portion are received in the cannula proximal end and the flange is compressed between the shoulder and the ferrule tapered portion to define a seal between the cannula and ferrule wherein the bore includes a bore distal portion having an inside diameter and wherein the cannula includes: a cannula distal portion extending in the bore distal portion and having an outside diameter; a cannula proximal portion extending in the bore distal portion and having an outside diameter, the cannula proximal portion outside diameter being greater than the cannula distal portion outside diameter; and a cannula tapered portion extending between the cannula distal portion and the cannula proximal portion; wherein the cannula distal portion outside diameter and the cannula proximal portion outside diameter are less than the bore distal portion inside diameter such that at least a first circumferential gap is formed about the cannula distal portion, the cannula tapered portion and the cannula proximal portion.