Active spring retraction safety syringe

Abstract

The invention discloses an active spring retraction safety syringe, and belongs to the technical field of syringes. The syringe comprises a needle cylinder, a needle head assembly, a plunger and a fixing ring, the needle head assembly comprises a spring seat, a needle head and a spring, the spring seat is oval, a film sealing piece is arranged at the top in the plunger, and the spring is arranged between the upper side of the spring seat and the top of the needle cylinder; an occlusion structure is arranged between the lower side of the fixing ring and the top end of the plunger, a sealing ring is arranged between the upper side of the fixing ring and the needle cylinder and located outside the spring seat, and an oval hole is formed in the middle of the sealing ring. An elliptical cavity is formed in the upper part in the needle cylinder. The upper portion of the spring seat is located in the oval cavity, and the lower side of the spring seat abuts against the upper side of the fixing ring and is perpendicular to the oval hole. The top end of the plunger is combined with the lower side of the fixing ring through a meshing structure, the plunger is rotated to drive the fixing ring to rotate, and after the fixing ring rotates to a preset angle, the spring seat penetrates through the oval hole downwards and punctures a film sealing piece to enable the needle head assembly to fall into the plunger.

Description

technical field [0001] The invention belongs to the technical field of syringes, in particular to an active spring retracting safety syringe. Background technique [0002] Retractable syringes are becoming extremely important and desirable for use in hospitals and medical institutions for many reasons. Specifically, retractable syringes are generally limited to single use, wherein the hypodermic needle of the syringe retracts into the syringe after fluid is aspirated and injected, thus preventing multiple use of the syringe from human immunodeficiency virus (HIV) and other patients. Potential spread of disease. Retracting the needle into the syringe after use also shields the needle and prevents inadvertent needle sticks or punctures for patients and healthcare personnel. [0003] For example, the patent application number CN 201110094183.4 discloses a syringe, comprising: a hollow syringe with an opening at the proximal end of the syringe, an opening at the distal end of ...

AI Technical Summary

Problems solved by technology

[0004] Most pogo pins are designed to be self-retracting, which is why people don’t like pogo pins nowadays. According to medical experts and actual use observations, when the pogo pin injection is completed, if the recipient sees or imagines that the needle tip will suddenly Rebounding is not very easy to accept psychologically, but the most important thing is that the elasticity of the spring cannot be predicted and controlled. A slight beating on the surface of the skin or inside the blood vessel will inadvertently break the blood vessel and skin, causing secondary damage. is a common and unavoidable occurrence; therefore, self-retracting pogo pins have long been discouraged

In addition, before using the pogo pin, the air may need to be exhausted in advance, and there may be misuse (such as excessively pushing the top) to cause self-destruction

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