| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection syringe piston retrogression preventing tool which is not necessary for holding a piston by a hand until filtration operation is completed, and by which even a woman with less physical strength performs filtration operation easily. SOLUTION: This injection syringe piston retrogression preventing tool is an instrument which is inserted into a piston (b) of an injection syringe A, and one end of the piston is automatically opened outwardly larger than an inner diameter of the injection cylinder (a) by performing aspirating operation while the other end of the piston is held when aspirating operation is performed by drawing the piston. One end of the piston (b) is made automatically opened outwardly larger than the inner diameter of the injection cylinder (a) by performing aspiration operation by holding the other end of the piston when a piston (b) is drawn and aspiration operation is performed, in the injection syringe A which is composed of an injection cylinder (a) and a piston (b). |
