Cartridge cap

Abstract

This invention provides a cartridge cap for preventing air staying in a cylindrical cartridge even if the air is sucked in during a sealing operation of the opening portion of the cylindrical cartridge in which medicinal solution is filled. The air which is sucked in during a sealing operation of the opening portion of the cylindrical cartridge 2 is released to the outside of the cylindrical cartridge 2 through an air relief passage AR which is formed along the inner periphery of the cylindrical wall portion 1 B including the gap between the outer periphery of the rip portion 2 A of the cylindrical cartridge 2 and the part of the inner periphery of the cylindrical wall portion 1 B where no terrace shaped receiving portions 1 F, 1 F, . . . are formed. It is possible to prevent air from staying in the cylindrical cartridge 2.

1 . A cartridge cap for sealing the opening portion of a cylindrical in which medicinal solution is filled, wherein a plurality of terrace shaped receiving portions are formed on the inner periphery of a cylindrical wall portion in a circumferential direction at predetermined intervals, the cylindrical wall portion continues to a top plate portion, the terrace shaped receiving portion has a joint receiving surface for jointing with the outer periphery of a flange shaped rip portion formed at the opening portion of the cylindrical cartridge and a tucking portion for holding the rip portion between the top plate portion and the tucking portion, and an air relief passage is formed along the inner periphery of the cylindrical wall portion between the terrace shaped receiving portions. 
     
     
         2 . A cartridge cap according to  claim 1 , wherein a plurality of thick portions are formed on the outer surface of the top plate portion at predetermined intervals in a circumferential direction, and the circumferential position of each thick portion is set so as to correspond to the circumferential position of each air relief passage between the terrace shaped receiving portions. 
     
     
         3 . A cartridge cap for sealing the opening portion of a cylindrical in which medicinal solution is filled, wherein a belt shaped receiving portion is continuously formed on the inner periphery of a cylindrical wall portion in a circumferential direction, the cylindrical wall portion continues to a top plate portion, the belt shaped receiving portion has a joint receiving surface for jointing with the outer periphery of a flange shaped rip portion formed at the opening portion of the cylindrical cartridge and a tucking portion for holding the rip portion between the top plate portion and the tucking portion, and an air relief hole is formed on the joint receiving surface of the belt shaped receiving portion and the air relief hole passes through the cylindrical wall portion. 
     
     
         4 . A cartridge cap according to  claim 1 , wherein the tucking portion is formed in a belt shape which extends in a circumferential direction of the cylindrical wall portion and a tapered surface is formed on the periphery to guide the outer periphery of the rip portion. 
     
     
         5 . A cartridge cap according to  claim 3 , wherein the tucking portion is formed in a belt shape which extends in a circumferential direction of the cylindrical wall portion and a tapered surface is formed on the periphery to guide the outer periphery of the rip portion.