Patent ID: 7134550

Claim:
A tool for attaching a pen needle assembly, which comprises a hub and needle cannula mounted to the hub, to an injection device that has a needle mounting surface disposed thereon, the tool comprising: a. a cylindrical storage member having elongated cavities complementaly in size and shape to the pen needle assembly, the cavities arranged radially in the cylindrical member so as to allow the tool to rotate about an axis of rotation that is concentric with the cavity's longitudinal axis; b. a rotatable cover mounted on the storage member having a cylindrical wall and having an opening that allows access to one cavity at a time; c. a removeably sterility barrier sealing the cavities; wherein: the height of the cylindrical member and cover are sized so as to allow a user to grasp the tool in one hand and to rotate the tool in one hand 360 degrees about the axis of rotation while simultaneously allowing the user to rotate the injection device 360 degrees in an other hand, wherein when the tool is grasped in the hand of a user, the majority of rotational force applied to the tool occurs at a distance displaced away from the axis of rotation of the tool, thereby maximizing the rotational force on the pen needle assembly.