Liquid drug transfer devices including a vial adapter designed for failsafe correct snap fitting on a medicinal vial for ensuring flow communication with the vial's interior. The vial adapters include at least two non-adjacent vial retention flex members for snap fitting over a vial opening for vial...http://www.google.com/patents/US8070739?utm_source=gb-gplus-sharePatent US8070739 - Liquid drug transfer devices for failsafe correct snap fitting onto medicinal vials
