US Patent 10391031 Adapter for vial access device

A system (10) includes a vial access device (12) including a spike (38), with the vial access device attachable to a first vial (80) defining a first vial size (81), and an adapter (14) transitionable between a shield position in which the adapter is attachable to the vial access device such that the adapter shields the spike of the vial access device and a vial position in which the adapter is attachable to a second vial (90) defining a second vial size (91), the second vial size different than the first vial size.