Patent ID: 8387809

Claim:
A method of assembling a medicament cartridge and an adaptor top, the medicament cartridge comprising a cylinder having a bottleneck at a first end, a fluid impermeable membrane secured across the first end by a cap and a displaceable plunger located internally of the cylinder towards a second end of the cylinder, and the adaptor top comprising a first cylindrical portion having at a first end an inwardly directing flange and a second cylindrical portion depending from a second end of the first cylindrical portion, and a second cylindrical skirt portion including a number of deformable members with free ends and being seated against a narrowing shoulder portion of the medicament cartridge, comprising the steps of: inserting the cap of the medicament cartridge through the second cylindrical portion into the first cylindrical portion until the cap is positioned against the inwardly directed flange; and plastically deforming the free ends beneath the cap to retain the adaptor top in position against the medicament cartridge.