Patent ID: 8858531

Claim:
A connection assembly for a drug delivery device comprising a tip defining a longitudinal axis and including a mounting area for mounting an adaptor thereon, and said adaptor including a mounting portion of thermoplastic material, forming a radial surface, which defines a mounting opening for mounting said adaptor onto said tip, said mounting area includes at least one first portion having an outer surface which is located at a first distance from said longitudinal axis and at least one second portion, adjacent to said first portion, having an outer surface which is located at a second distance from said longitudinal axis, said second distance being different from said first distance, said radial surface being located after assembly of said adaptor over said first portion and said second portion; said mounting opening and said at least one first portion and second portion dimensioned such that said radial surface of said mounting portion is in contact with the outer surfaces of both said first portion and said second portion; wherein said first portion is in the form of a circumferential rib or groove centered on said longitudinal axis and said second portion is in the form of a circumferential surface centered on said longitudinal axis, adjacent said rib or groove, said first distance and second distance being the respective radiuses of said rib or groove and circumferential surface.