CPC A61M 5/322 (2013.01) | 19 Claims |
1. An injection device, comprising an interface for mounting on a syringe body, the interface comprising an internal passage delimited by an inner wall, a needle and a sheath for receiving said needle, said sheath comprising an outer wall provided with a contact portion of said sheath in contact with an attachment portion of the inner wall of the interface, wherein:
the contact portion comprises a first bead forming a first ring protruding from the outer wall of the sheath;
the attachment portion comprises a second bead forming a second ring protruding from the inner wall of the interface and a third bead forming a third ring protruding from the inner wall of the interface, wherein the attachment portion further comprises an intermediate area between the second bead and the third bead, wherein the intermediate area is cylindrical in shape;
wherein the third bead and the second bead of the attachment portion frame the first bead of the contact portion; and
wherein the first bead of the contact portion is in contact with the third bead in a first contact area that is a circular line and forms a first seal between the first bead and the third bead and is in contact with the second bead of the attachment portion in a second contact area that is another circular line and forms a second seal between the first bead and the second bead, but is not in contact with the intermediate area of the attachment portion.
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