Syringe

Abstract

The present invention provides a syringe which prevents a medication liquid filled into the syringe from forming strands from the tip nozzle when removing the cap, even in cases when the medication liquid is highly viscous. A tip opening (211) is closed by causing the inner peripheral surface (631) of the cap sealing part (63) of a cap (6) to be in close contact with the outer peripheral surface (214) of the tip portion of the tip nozzle (21) of a barrel (2). At the same time, the outer periphery of a Luer lock section (22) is covered with the outer tube cover (62) of the cap. A swollen section (213) is provided to the front end portion of the inner hole (212) in the tip nozzle to reduce the diameter (d) of the tip opening. The length (s) of the seal formed by the cap sealing part (63) is set to a predetermined level which is relatively short. The diameter of the medication liquid placed in the syringe and sucked until the liquid is destroyed by a vacuum when the cap is removed is set to a very fine diameter and is adapted so as to be quickly destroyed by a vacuum. Thus, even if the medication liquid filled into the syringe is highly viscous, the medication liquid does not form strings.

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

However, even after the depressurized state in which the above-mentioned gap space K is opened by the top cover 103 being pulled out completely from the tip nozzle 101, as Figure 9 As exemplified in (a), it is also possible to produce such a thread that the liquid medicine extends from the tip nozzle 101 to the top cover 103

It is considered that this kind of threading tends to occur especially as the viscosity of the filling chemical solution 106 increases, and its degree tends to increase.

[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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