Injection Device

Abstract

An injection device 110 is described having a housing 112 and a housing closure means 130. The injection device 110 houses a syringe 114 having a needle 118 which is sealed by a boot 117. The housing closure means 130 is arranged so that the boot 117 can be connected to the housing closure means 130 simply, but cannot be removed from the housing closure means 130. The housing 112 and housing closure means 130 are arranged so that upon rotation of the housing closure means 130, the housing closure means 130 member first rotates relative to the housing and then moves away from the housing. The injection device is simple to use and manufacture.

1 . An injection device comprising:
 a housing adapted to receive a syringe having a discharge nozzle and a boot that covers its discharge nozzle, the housing having a longitudinal axis and including a first guide; and   a housing closure member including a second guide;   wherein the first guide and the second guide are arranged so that rotation of the housing closure member relative to the housing causes the housing closure member first to rotate relative to the housing and then to move away from the housing, wherein the housing closure member further comprising means for connecting to the boot of the syringe so that removal of the housing closure member from the housing causes removal of the boot from the syringe.   
     
     
         2 . The injection device according to  claim 1 , wherein one of the first guide and the second guide comprises a slot and the other of the first guide and the second guide comprises a protrusion for communicating with the slot. 
     
     
         3 . An injection device according to  claim 2 , wherein the slot has a first section which runs in a direction perpendicular to the first axis, and a second section which turns away from the first section towards the direction of the first axis. 
     
     
         4 . An injection device according to  claim 1  or  claim 2 , wherein the protrusion is moulded from the same material as the housing closure means. 
     
     
         5 . An injection device according to any one of  claims 2  to  4 , wherein one of the housing and the housing closure member has a second slot and the other of the housing and the housing closure member has a second protrusion for communicating with the second slot. 
     
     
         6 . An injection device according to any preceding claim further comprising an external grip feature with which a user can grip the housing closure member. 
     
     
         7 . An injection device according to any preceding claim wherein the means for connecting comprises a plurality of splines. 
     
     
         8 . An injection device according to  claim 7 , wherein the plurality of splines are arranged around the internal diameter of a cylinder mounted on the housing closure means. 
     
     
         9 . An injection device according to  claim 8 , wherein the splines are mounted on the cylinder such that the angle formed between each spline and a radius of the cylinder is less than  90  degrees. 
     
     
         10 . An injection device according to any of  claims 7  to  9 , wherein, upon connecting the boot of the syringe to the housing closure member and rotating the housing closure member, the splines rotate the boot of the syringe relative to the discharge nozzle. 
     
     
         11 . An injection device according to any preceding claim, wherein the means for connecting is moulded from the same material as the housing closure means. 
     
     
         12 . An injection device substantially as hereinbefore described with reference to and as shown in the attached drawings.