Patent ID: 7946437

Claim:
A closure system for a vial having an upwardly-facing mouth opening bounded by a rim, the closure system comprising: an elastomer closure part shaped to sealingly engage with the mouth opening, having a lower surface facing the interior of the vial and an opposite upper surface facing away from the vial, and capable of being punctured by a needle, a clamp part able to engage with the vial, and able to bear upon the upper surface of the closure part to hold the closure part in a closing relationship with the mouth opening, the clamp part having an aperture therein through which a region of the upper surface of the closure part is exposed when the clamp part is engaged with the vial, and wherein the clamp part further comprises a peripheral skirt wall extending downwardly and having snap-fit engagement parts thereon to engage the vial via a snap-fit connection, wherein the snap-fit engagement parts are resiliently deformable so that they deform to fit over the rim of the vial and then resiliently snap back to engage the vial via a snap-fit connection, a cover part, engageable with the clamp part to cover the said region of the closure part, the cover part at least partly closing the aperture, wherein the cover part comprises an upper wall having a segment linked to the remainder of the cover part by a frangible link, said link severable to allow the segment to be sufficiently detached from the remainder of the cover part to thereby allow access to the region of the closure exposed through the aperture and further wherein the cover part comprises a peripheral skirt wall and the skirt wall has a snap-fit engagement part adjacent its lower extremity to engage with the clamp part.