Cap assembly for a drug delivery device

A cap assembly for a drug delivery device, the cap assembly comprising:

• a cap body to protect and to receive a distal dispensing end of the drug delivery device, and comprising a receptacle having at least a first interconnection member at a proximal end thereof to releasably engage with a housing component of the drug delivery device,
• an interlock member operably engaged with the cap body and comprising a second interconnection member to releasably engage with a distal end section of the distal dispensing end to provide a safety lock for the cap body,
• wherein engagement of the second interconnection member with the distal end section of the distal dispensing end prevents an engagement of the first interconnection member with the housing component of the drug delivery device from being released,
• wherein the interlock member comprises an inner sleeve extending axially inwardly in a proximal direction from a distal end of the cap body, with the second interconnection member disposed at a proximal portion of the inner sleeve,
• wherein a portion of the interlock member protrudes in a distal direction from the distal end of the cap body,
• wherein the second interconnection member is threadedly engageable with the distal end section or wherein the second interconnection member is interlockable with the distal end section by way of a snap-fit engagement,
• wherein the cap body and the interlock member comprise at least a first pair of mutually corresponding and radially extending stop elements to restrict relative axial displacement of the cap body with respect to the interlock member
• and to allow the interlock member to exert proximally directed holding forces to the cap body via the stop elements.