Cartridge

Abstract

A cartridge arrangement comprises a frangible portion and a guide tube. The frangible portion being substantially housed within the guide tube with an end of the frangible portion being sealed by a clip. A cap attaches to an end of the guide tube by a screw thread. Unscrewing of the cap urges arms, having a portion seated behind the clip, away from the guide tube thereby opening the frangible portion.

1 . A cartridge arrangement comprising: 
 a frangible portion, the frangible portion being substantially housed within a guide tube,    an end of the frangible portion being sealed by sealing means and    an engagement means arranged to engage the sealing means such that motion of the engagement means away from the guide tube urges the sealing means away from the frangible portion.    
   
   
       2 . A cartridge arrangement according to  claim 1 , wherein the engagement means comprises a resilient member having at least one projection arranged to abut the sealing means.  
   
   
       3 . A cartridge arrangement according to  claim 1 , wherein the engagement means is fabricated from a plastics material.  
   
   
       4 . A cartridge arrangement according to  claim 1 , wherein the engagement means comprises a cap arranged to attach to an end of the guide tube.  
   
   
       5 . A cartridge arrangement according to  claim 4 , wherein the cap is arranged to engage the guide tube by means of a screw thread.  
   
   
       6 . A cartridge arrangement according to  claim 5 , wherein unscrewing of the cap when engaged is arranged to urge the sealing means away from the guide tube.  
   
   
       7 . A cartridge arrangement according to  claim 4 , wherein the engagement means comprises a locking plate located between an end of the cap and a head of the engagement means.  
   
   
       8 . A cartridge arrangement according to  claim 1 , wherein the engagement means comprises arms having a portion shaped such that they are complementarily curved to the curvature of a section of the cap.  
   
   
       9 . A cartridge arrangement according to  claim 1  wherein a portion of the engagement means is arranged to locate within a neck of the guide tube.  
   
   
       10 . A cartridge arrangement according to  claim 1  wherein a portion of the engagement means is arranged to locate within a body of the guide tube.  
   
   
       11 . A cartridge arrangement according to  claim 1  wherein the sealing means comprises a staple or a clip.  
   
   
       12 . A cartridge arrangement comprising: 
 a frangible portion, the frangible portion being substantially housed within a guide tube,    an end of the frangible portion being sealed by a clip, and    a cap arranged to attach to an end of the guide tube by a screw thread wherein unscrewing of the cap when engaged urges arms, having a portion seated behind the clip, away from the guide tube thereby opening the frangible portion.    
   
   
       13 . A cartridge arrangement comprising: 
 a frangible portion, the frangible portion being substantially housed within a guide tube,    an end of the frangible portion being sealed by a sealing device, and    a plastic cap arranged to attach to an end of the guide tube by a screw thread wherein unscrewing of the sealing device when engaged urges one or more arms, each of the one or more arms having a portion seated behind the sealing device, away from the guide tube thereby opening the frangible portion.