Cap Assembly for a Medicament

Abstract

An auto-injector for administering a dose of a liquid medicament includes an elongate housing arranged to contain a syringe with a hollow needle and a stopper for sealing the syringe and displacing the medicament, the housing having a distal end and a proximal end with an orifice intended to be applied against an injection site. The syringe is slidably arranged with respect to the housing. A spring capable of, upon activation: pushing the needle from a covered position inside the housing into an advanced position through the orifice and past the proximal end (P), operating the syringe to supply the dose of medicament (M), and retracting the syringe with the needle into the covered position. After delivering the medicament, an activator arranged to lock the spring in a pressurized state prior to manual operation and capable of, upon manual operation, releasing the spring for injection.

1 . (canceled) 
     
     
         2 . A drug delivery device, comprising:
 an elongate member;   a drug container with a needle arranged in the elongate member, the needle having a proximal needle tip configured to pierce a skin at an injection site;   a needle shield configured to attach to the needle and cover the proximal needle tip; and   a cap that is detachable from the drug delivery device, the cap comprising
 a cap member providing an outer surface of the cap, wherein the outer surface is configured to be manipulated by a user to detach the cap from the drug delivery device; and 
 an interface member configured to engage the needle shield, the interface member being axially locked to the cap member, and the cap member being rotatable relative to the interface member in order to detach the cap from the drug delivery device. 
   
     
     
         3 . The drug delivery device of  claim 2 , wherein a proximal end of the cap covers a proximal end of the needle shield. 
     
     
         4 . The drug delivery device of  claim 2 , wherein the needle shield is configured to be removed from the needle when the cap is detached from the drug delivery device. 
     
     
         5 . The drug delivery device of  claim 2 , wherein the interface member is axially locked to the cap member such that relative axial movement between the interface member and the outer surface is prevented. 
     
     
         6 . The drug delivery device of  claim 2 , wherein the elongate member has a proximal end configured to contact the skin adjacent to the injection site. 
     
     
         7 . The drug delivery device of  claim 2 , wherein the elongate member is configured to extend axially beyond the proximal needle tip when the cap is detached. 
     
     
         8 . The drug delivery device of  claim 2 , wherein relative axial movement between the drug container and the elongate member is necessary to pierce skin at the injection site. 
     
     
         9 . The drug delivery device of  claim 2 , wherein the cap is threadedly coupled to the elongate member. 
     
     
         10 . The drug delivery device of  claim 2 , wherein the interface member comprises a sheet. 
     
     
         11 . The drug delivery device of  claim 10 , wherein the sheet is a metal sheet. 
     
     
         12 . The drug delivery device of  claim 10 , wherein the interface member comprises a plurality of barbs. 
     
     
         13 . The drug delivery device of  claim 12 , wherein the plurality of barbs are configured to engage the needle shield. 
     
     
         14 . The drug delivery device of  claim 13 , wherein the plurality of barbs are configured to engage the needle shield between a proximal end of the needle shield and a distal end of the needle shield. 
     
     
         15 . The drug delivery device of  claim 2 , wherein the drug container is a syringe. 
     
     
         16 . The drug delivery device of  claim 15 , wherein the syringe is held in a syringe carrier and wherein the syringe is supported at a proximal end of the syringe in the syringe carrier. 
     
     
         17 . The drug delivery device of  claim 2 , further comprising a drive spring and a plunger. 
     
     
         18 . The drug delivery device of  claim 17 , wherein the plunger is configured to transfer a spring force of the drive spring to a movable stopper within the drug container to dispense a drug from the drug container. 
     
     
         19 . The drug delivery device of  claim 18 , wherein the drive spring is arranged in a distal part of drug delivery device. 
     
     
         20 . The drug delivery device of  claim 18 , wherein the drug delivery device is an auto-injector.