Medicament delivery device

Abstract

A medicament delivery device is presented having a second housing part, a plunger rod arranged in the second housing part and configured to act on a stopper arranged inside a multi-chamber container. A first housing part contains the multi-chamber container, where the first housing part is arranged to be manually displaced into the second housing part by relative rotation between the first and the second housing parts for mixing at least two substances arranged inside the multi-chamber container. The delivery device further has a rotating contact element arranged between said plunger rod and said stopper capable of rotating in relation to said plunger rod.

1 . A medicament delivery device comprising:
 a first housing part having a proximal end and comprising a multi-chamber container having a distal stopper and a proximal stopper separated by an axial distance;   a second housing part that is movably attached to first housing part and where relative movement between of the first and second housing parts reduces the axial distance;   a plunger rod rotationally fixed within the second housing part; and   a rotating contact element positioned between the plunger rod and the distal stopper, where the rotating contact element is in a journaled connection to the plunger rod such that the rotating contact element will rotate relative to the plunger rod when in direct contact with the distal stopper,   wherein relative movement between the first and second housings causes the distal stopper to move proximally relative to the proximal stopper for mixing at least two substances present inside the multi-chamber container.   
     
     
         2 . The medicament delivery device of  claim 1 , wherein the first housing is rotatable relative to the second housings causes the multi-chamber container to move distally relative to the plunger rod. 
     
     
         3 . The medicament delivery device of  claim 2 , wherein the second housing has a distal end separated by a distance from the proximal end and where the second housing part is threadedly attached to first housing part and where relative rotation reduces the distance between the distal and proximal end. 
     
     
         4 . The medicament delivery device of  claim 1  further comprises an activation member located in the second housing part that is operatively connected to a plunger rod. 
     
     
         5 . The medicament delivery device of  claim 1 , wherein the first housing part comprises a thread on an outer surface and the second housing part comprises an inner surface having a corresponding thread engaged with the thread on the first housing part such that relative rotation of the first and second housing parts causes a distal end of the first housing to move adjacent the second housing part in a distal direction. 
     
     
         6 . The medicament delivery device of  claim 1 , where the journaled connection comprises a shaft operatively connected to both the plunger rod and the rotating contact element such that rotation of second housing part relative to the first housing part causes rotation of plunger rod but not rotation of the rotating contact element. 
     
     
         7 . The medicament delivery device of  claim 1 , wherein the journaled connection comprises a shaft having a proximal end and a distal end, where the distal end is fixedly attached to the terminal proximal end face of the plunger rod. 
     
     
         8 . The medicament delivery device of  claim 7 , wherein the rotating contact element further comprises a disk having a central passage configured so that the disk is journaled to the proximal end of the shaft such that when the rotating contact element engages the distal stopper during the relative movement of the displacement of the first housing part relative to the second housing part the rotating contact element will rotate with the stopper and relative to the plunger rod and the shaft. 
     
     
         9 . The medicament delivery device of  claim 1 , where the rotating contact element abuts the distal stopper to prevent the contacting element from rotating when the second housing part is rotated relative to the first housing part. 
     
     
         10 . The medicament delivery device of  claim 4 , where the activation member comprises an activator sleeve having a flexible tongue that engages the plunger rod prior to the mixing of the two substances. 
     
     
         11 . The medicament delivery device of  claim 10 , where the flexible tongue fits into a groove in the plunger rod to prevent axial movement of the plunger rod in the proximal direction. 
     
     
         12 . The medicament delivery device of  claim 10 , further comprising a cover positioned at the distal end of the second housing part, where depression of the cover causes proximal movement of the activator sleeve causing the flexible tongue to disengage from plunger rod so the plunger rod can move axially toward the proximal end of the first housing part.