Patent ID: 6394985
Filing Date: 2002-05-28
Classification: A61M

Abstract:
A backflow proof structure for a syringe comprising a central cylinder portion and a plurality of blocks which are positioned in a protruding end of said syringe, wherein: a flared portion is provided on the bottom of said central cylinder portion, and a tip is provided on the top of said central cylinder portion, said tip has an outer surrounding space which is filled with a piece of crystallized syrup as a separating member to separate a crown cap covering the top of said tip from said central cylinder portion; said central cylinder portion is placed in said protruding end, and a silicone cube is placed beneath said central cylinder portion, an irregular-shaped stopper is placed to closely contact the bottom of said protruding end to thereby push said crown cap on said top of said central cylinder portion out of said protruding end.