Injector

Abstract

There is provided a syringe capable of preventing the occurrence of "link-thread" from the distal end nozzle when the cap is pulled out, even in the case where the medicinal liquid filled has a high viscosity. The inner peripheral surface (631) of the seal cap (63) in the cap (6) is brought into close contact with the outer peripheral surface (214) of the distal end side portion of the distal end nozzle (21) in the barrel (2) so that the distal end opening (211) is hermetically closed off. At the same time, the outer peripheral side of the luer lock adapter (22) is covered with the outer tubular cover (62) of the cap. The bulge part (213) is formed in the distal end side portion of the inner aperture (212) in the distal end nozzle so that the aperture diameter ( d ) of the distal end opening is reduced to a small aperture diameter and, in addition, the length of seal (s) by the seal cap (63) is made to be a relatively short, predetermined length. The diameter of the filled medicinal liquid to be sucked in until the vacuum breaks down when the cap is pulled out, is made very small and, in addition, the vacuum is made to break down instantly, thereby making it possible to prevent the occurrence of "link-thread" even if the medicinal liquid filled is of high viscosity.

Description

technical field [0001] The present invention relates to a syringe, in particular to a syringe used for a syringe (pre-filled syringe: Pre-filled syringe) that has been filled with a medical solution. The prefilled syringe is shipped with a cap attached to the nozzle at the tip of the syringe in a state where the drug solution inside is sealed. In particular, the present invention relates to a syringe that eliminates the possibility of threading from the tip nozzle during actual use after shipment as a prefilled syringe. Background technique [0002] Generally, in a prefilled syringe, the filling drug solution inside is in a sealed state between a gasket fitted in from the base end opening of the syringe for the prefilled syringe and a cap attached to the tip nozzle. Then, the prefilled syringe filled with the drug solution in a hermetically sealed state is shipped after being sterilized and provided to medical institutions and the like. [0003] When heat sterilization is ...

AI Technical Summary

Problems solved by technology

[0009] When such threading occurs, splashing of the liquid medicine after the threading breaks, adhesion of the liquid medicine to the clothes or hands of the medical-related person who handles the prefilled syringe, or tip nozzle after the threading breaks occurs. On the top opening 102 of 101, droplet Q1 generated due to surface tension is formed in a state exposed to the external space (refer to Figure 9 (b)) such undesirable situation

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