Retraction structure of safety syringe

Abstract

The invention discloses a retraction structure of a safety syringe, in particular to an innovative design which is used for safely retracting a syringe needle into a cylinder body. The retraction structure mainly comprises the cylinder body, an upper needle seat, a lower needle seat, a push rod, a rotation limit unit, an L-shaped locking unit and a quick guide braking unit; therefore, the retraction structure leads a rotating seat of the push rod to be rapidly aligned and meshed with a rotating groove relatively to the needle seats by the L-shaped locking unit and the quick guide braking unit, so that the user can conveniently circularly rotate the push rod and lead the needle seat to be aligned in the next step, and open retraction mode of the syringe needle can be available; furthermore, as the quick guide braking unit is closely meshed and contacted, the residual liquid medicine is greatly reduced, the safety and environmental protection quality of the retraction structure of the safety syringe can be improved, and the syringe needle is convenient for retraction use and has progressive practicability.

Description

technical field [0001] The invention relates to a safety syringe, in particular to a retracting structure capable of safely retracting an injection needle in a barrel. Background technique [0002] Most of the syringes currently on the market are traditional, including injection needles without any safety devices. Not only can they be reused, but they are likely to cause drug and blood contamination. In addition, the exposed injection needles have caused medical staff and The stabbing of cleaning staff deepens the epidemic of infectious diseases. In view of the problems existing in the above-mentioned conventional syringe structure, how to develop a syringe that can avoid secondary pollution caused by repeated use is what consumers are eagerly looking forward to, and it is also the goal and direction that relevant companies must work hard to develop breakthroughs. [0003] In view of this, the ZL2008201079735 injection needle retractable safety syringe previously applied by...

AI Technical Summary

Problems solved by technology

[0002] Most of the syringes currently on the market are traditional, including injection needles without any safety devices. Not only can they be reused, but they are likely to cause drug and blood contamination. In addition, the exposed injection needles have caused medical staff and Stabbings by cleaning staff, deepening epidemic

In view of the above-mentioned problems existing in the structure of conventional syringes, how to develop a syringe that can avoid secondary pollution caused by repeated use is what consumers are eagerly looking forward to, and it is also the goal and direction that relevant companies must work hard to develop breakthroughs

[0003] In view of this, the ZL2008201079735 injection needle retractable safety syringe previously applied by the applicant is mainly characterized in that an L-shaped groove is opened at a predetermined position on the outer edge of a needle seat, wherein the L-shaped groove is roughly divided into horizontal groove sections And the longitudinal groove section, and the L-shaped groove corresponding to the needle seat inside the cylinder is provided with a fixed convex point, and the fixed convex point is just matched with the guide slide to be assembled into the horizontal groove section and the longitudinal groove section of the L-shaped groove; however, this custom However, the following problems still exist in the actual use experience of the known structure type: the interior of the known safety syringe is mainly composed of a single needle seat with a barrel and a push rod. However, when it is applied to a replaceable needle , often when replacing a smaller injection needle after extracting the liquid medicine, due to the radial force and axial force generated by the front end of the syringe rotating and disassembling the injection needle in the process of replacing the injection needle, the tight fit between the needle seat and the barrel Sex and fit are destroyed

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