Needleless connector

Abstract

Provided is a needleless connector having a novel structure making it possible to effectively implement both stable administration of a drug solution or the like and to prevent backflow of blood or the like by stably and quickly switching between communication and shutoff of a drug solution flow path in a simple structure. A bottomed, cylindrical hollow elastic body (16) that opens toward an outlet side of a drug solution flow path (80) is accommodated and arranged in a accommodation section (20) formed in a housing (12), and a middle protrusion (66) is provided toward an inlet side of the drug solution flow path (80) from a middle portion of a bottom wall (70) of the hollow elastic body (16). Insertion of a male Luer (86) pushes on a distal end of the middle protrusion (66) and causes the bottom wall (70) of the hollow elastic body (16) to be elastically deformed so as to penetrate into a peripheral wall (68), expanding the volume of the drug solution flow path (80), which is formed between an outer surface of the hollow elastic body (16) and an inner surface of the accommodation section (20). Taking out the male Luer (86) and releasing the elastic deformation of the hollow elastic body (16) causes the volume of the drug solution flow path (80) to be reduced.

Description

technical field [0001] The present invention relates to a needleless connector for use in a fluid flow path such as an infusion path in the medical field, etc., enabling connection of a male luer provided on a syringe or the like to the fluid flow path. Background technique [0002] Needleless connectors are sometimes used with fluid flow paths for which infusions, blood transfusions, and the like are performed in the medical field, thereby enabling connection and disconnection of syringes, infusion bags, and the like. This needleless connector is configured to have a liquid medicine flow path inlet and outlet at one side and the other side in the length direction of the housing, and has an elastic valve body equipped with a narrow hole at the attached inlet. seam. The outlet of the liquid medicine flow path can be connected to the catheter, and is connected to the outlet of the liquid medicine flow path through the catheter inserted into the blood vessel, so that the liqui...

AI Technical Summary

Problems solved by technology

[0006] However, with the structure of Patent Document 1, there is a problem that switching to the communication state of the liquid medicine flow path cannot be achieved with sufficient reliability due to reasons such as blockage caused by the deformed piston wall of the lower passage.

However, also in this case, the problem of blood backflow before blocking the drug flow path is not eliminated due to the pressure fluctuation accompanying the volume change of the drug liquid flow path

In addition, since the bellows portion of the hollow elastic body undergoes general compression deformation in the axial direction, it is difficult to achieve both ease of deformation and sufficient shape restorability, and it is difficult to stably and quickly switch between the liquid medicine flow path communication state and resistance. Execute switching between off states

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