| 摘要 |
PROBLEM TO BE SOLVED: To evade a danger caused by exposing a scrapped injection needle by crashing the tip of the injection needle by inversely inserting a cut piston from the front part of a syringe. SOLUTION: Projections 11, 110 and 120 are provided respectively on the front part and rear part of the inner wall of this syringe, the projection at the front part among them is to fix the injection needle 5, and when the piston 20 is returned to the back after injection is performed, the piston 20 is cut off at the contact point of a rubber plug 22 and plastic. When the piston 20 is returned and brought to the projection point at the rear part of the syringe, it is stopped there and the piston is cut off. The cut piston is inserted inversely from the front part of the syringe and the injection needle 5 recovered in the syringe is bent and crashed. Further, the piston is provided with the projection part 202 on a middle position and the piston inversely housed inside the syringe is hooked by the projection 11 present at the front part of the inner wall of the syringe and fixed. |
