| 摘要 |
PROBLEM TO BE SOLVED: To eliminate difference in pressure between the inside and outside of a vial for easier suction of injection liquid into the syringe by providing a groove from the sharp end toward the syringe side in the outer surface of a hollow plastic injection needle. SOLUTION: In a hollow plastic needle 1 for injection with one end connected to a syringe, a groove 3 is provided along the injection passage from its sharp end toward a connection 2 with the syringe in the outer surface of the needle 1. Upon penetration of the needle 1 into a vial, a gap though very small is produced between a cut section of the vial rubber plug (namely the groove) and the needle 1 or the plug and the rib-to-rib section in the needle outer surface. This eliminates the pressure difference which would otherwise be in presence between the inside and outside of the vial in the process of liquid medicine suction or medicinal solution injection, and facilitates the liquid medicine suction operation. |
