Safety syringe

Abstract

The invention discloses a safety syringe, which is characterized in that: a needle head is formed by sheathing and connecting an outer needle bed and an inner needle bed. The end of a core bar is provided with a return column which protrudes out of the surface of a capsule. The upper part of the inner needle bed is in cylinder shape and the lower part is composed of fins. One end of the fin is fixed at the end of the cylinder shape, while the other end of the fin synthesizes a taper structure which can be in closed state or opening state. The applied drawing force is less than 15N when a product pulls back the core bar and also than the drawing force needed by a traditional safe structure syringe. A sealing ring arranged between the inner and the outer needle bed causes good sealing property at the part of the needle head. The product is applicable to tropical and frigid zones, the rest parts adopt full plastic material except a needle tube and all parts are convenient in die sinking. The syringe can realize full automatic part assembly, is simple and practical in the product structure, high in the stability of a safe locking structure and has good market prospect.

Description

Technical field: [0001] The invention relates to the technical field of medical devices, in particular to a safety syringe, and in particular to its mechanical connection structure. Background technique: [0002] Comparative document 1, patent number: ZL200420092408.8, publication number: CN2724733, patentee: Hengwang Biochemical Technology Co., Ltd., this case discloses a "pull-back type safety syringe", which discloses a pull-back type safety syringe A safety syringe, which includes a needle, a syringe and a plunger, wherein the bottom of the needle is provided with a first connecting part, a needle socket is formed above the syringe, and an injection space is formed below, and the needle is combined with a predetermined binding force On the needle socket, the plunger can be pushed into the injection space in the syringe from the bottom of the syringe, wherein the piston is made of elastic material, has a hollow space, and is set in a shape that can be easily compressed an...

AI Technical Summary

Problems solved by technology

[0007] There are many types of existing safety syringes, but they all have the following disadvantages: 1. The thrust that the needle can bear is only about 30 Newtons, and the needle is easy to be compressed and slip during operation; The required thrust is relatively large, and it is not easy to achieve one-handed operation; 3. The pullback force required when the core rod is pulled back is relatively large; 4. The product structure is complex, and it is difficult to open the mold and assemble

Images