Patent ID: 6875205

Claim:
A vial adapter for interconnecting with vial closures of different diameters, each closure having a seal and each vial having a neck comprising: an adapter housing having a first end with an inner periphery with a circular array of claws, and having a second end, the housing having a thickness at the inner periphery; and a sharpened cannula extending from the first end of the adapter housing for penetrating a seal of a vial closure to establish fluid communication between the vial and the first end; wherein the array of claws comprises: a first set of claws extending radially inwardly from the inner periphery, each of which has a first length and each of which is located and formed to snap under the closure of the vial about the neck; and a second set of claws extending radially inwardly from the inner periphery, each of the second set of claws having a second length that is longer than the first length of the first set of claws, and each of which is located and formed to snap under the closure of the vial about the neck, each of the second set of claws formed such that when the vial adapter is placed over a closure exceeding a selected diameter, each of the second set of claws will deflect and plastically deform thereby permitting the first set of claws to snap under the larger closure.