Syringe barrel and cylinder holder

Abstract

An arcuate guide projection is provided on a front surface of a flange of a syringe barrel and an arcuate guide groove for guiding the guide projection is provided on a front sidewall surface of a flange insert groove of a cylinder holder. When the syringe is mounted, the guide projection and the guide groove are brought into engagement thereby preventing the flange from slipping off upwardly.

1 . A syringe barrel having a flange, comprising a guide projection on a front surface of the flange.  
     
     
         2 . A syringe barrel according to  claim 1 , further comprising: 
 a press projection formed on the rear surface of the flange; a tip of the press projection being capable of being compressed to press the flange against a front sidewall surface of a flange insert groove when the flange is inserted into the flange insert groove formed in a cylinder holder and is fitted in a use position.    
     
     
         3 . A cylinder holder for holding a syringe barrel having a flange, the syringe barrel comprising a guide projection on a front surface of the flange; the cylinder holder comprising: 
 a flange insert groove for holding a flange of a syringe barrel and    a guide groove formed on a front sidewall surface of the flange insert groove; the guide groove being capable of guiding a guide projection formed on a front surface of a flange of a syringe barrel.    
     
     
         4 . A chemical solution injection system, comprising: 
 (a) a syringe barrel having a flange which comprises a guide projection on a front surface of the flange; and    (b) a cylinder holder which comprises a flange insert groove for holding a flange of a syringe barrel and a guide groove formed on a front sidewall surface of the flange insert groove; the guide groove being capable of guiding a guide projection formed on a front surface of a flange of a syringe barrel;    whereby, the slip off of the syringe barrel from the cylinder holder is prevented.    
     
     
         5 . A chemical solution injection system, wherein the syringe barrel further comprises: 
 a press projection formed on the rear surface of the flange; a tip of the press projection being capable of being compressed to press the flange against a front sidewall surface of a flange insert groove when the flange is inserted into the flange insert groove formed in a cylinder holder and is fitted in a use position.    
     
     
         6 . A syringe barrel according to  claim 1 , wherein the guide projection is arcuate shape.  
     
     
         7 . A syringe barrel according to  claim 7 , further comprising: 
 a press projection formed on the rear surface of the flange; a tip of the press projection being capable of being compressed to press the flange against a front sidewall surface of a flange insert groove when the flange is inserted into the flange insert groove formed in a cylinder holder and is fitted in a use position.    
     
     
         8 . A cylinder holder according to  claim 3 , wherein the guide groove is arcuate shape.  
     
     
         9 . A chemical solution injection system, comprising: 
 a syringe barrel of  claim 6  and    a cylinder holder of  claim 8 .    
     
     
         10 . A chemical solution injection system, comprising: 
 a syringe barrel of  claim 7  and    a cylinder holder of  claim 8 .    
     
     
         11 . A pre-filled syringe, comprising 
 a syringe including a syringe barrel of  claim 6  and    a chemical solution filled in the syringe barrel.    
     
     
         12 . A pre-filled syringe, comprising 
 a syringe including a syringe barrel of  claim 7  and    a chemical solution filled in the syringe barrel.    
     
     
         13 . The pre-filled syringe according to  claim 11 , wherein said chemical solution comprises a contrast medium.  
     
     
         14 . The pre-filled syringe according to  claim 12 , wherein said chemical solution comprises a contrast medium.  
     
     
         15 . A syringe barrel according to  claim 1 , wherein the flange has two flange cut portions symmetrically positioned in the rim of the flange opposite to each other.  
     
     
         16 . A syringe barrel according to  claim 15 , wherein an even number of the arcuate guide projections are provided so that each half number is positioned symmetrically to each other on the flange where the two flange cut portions are not provided.  
     
     
         17 . A syringe barrel according to  claim 16 , wherein the guide projections are arcuate shape.  
     
     
         18 . A syringe barrel according to  claim 2 , wherein the press projection has a narrower width toward the tip, whereby the press projection is capable of being more deformed by being pressed.  
     
     
         19 . A syringe barrel having a flange, comprising a plurality of guide projections aligned in a line in the circumferential direction on a front surface of the flange  
     
     
         20 . A syringe barrel according to  claim 19 , wherein the flange has two flange cut portions symmetrically positioned in the rim of the flange opposite to each other.  
     
     
         21 . A syringe barrel according to  claim 20 , wherein an even number of the guide projections in the form of truncated cones are provided so that each half number is positioned symmetrically to each other on the flange where the two flange cut portions are not provided.