VIAL STOPPER FOR A LYOPHILIZATION VIAL AND CLOSURE METHOD FOR CLOSING A LYOPHILIZATION VIAL

摘要

A vial stopper (110) for closure of a lyophilization vial (112) is disclosed. The vial stopper (110) has a stopper body (114) comprising a first circumferential sealing surface (116) for hermetically sealing against an interior surface (118) of a mouth (120) of the vial (112) in a first position (122) of the vial stopper (110). The stopper body (114) further comprises a second circumferential sealing surface (124) for hermetically sealing against the interior surface (118) of the mouth (120) of the vial (112) in a second position (126) of the vial stopper (110). The second sealing surface (124) is spaced apart from the first sealing surface (116) in an axial direction (128) of the stopper body (114). The stopper body (114) further comprises an intermediate region (130) in between the first (1 16) and second sealing surfaces (124), the intermediate region (130) having at least one venting element (132) for venting an interior (134) of the vial (112) in at least one intermediate position (136) of the stopper (110) in between the first (122) and second positions (126).