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Safety syringe capable of pulling back syringe needle

A technology of safety syringes and injection needles, applied in the field of safety syringes and syringes, can solve the problems of affecting the injection effect, needle rotation, and inconvenient assembly, and achieve the effects of avoiding accidental stab wounds, achieving axial positioning, and convenient assembly

Inactive Publication Date: 2010-02-10
王兴章 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this structure can achieve axial backward positioning, it requires a large force to make the needle seat pass over the annular protrusion and move axially when self-destructing
In addition, this structure cannot realize the circumferential positioning of the needle seat, which will cause the needle to rotate during use and affect the injection effect
On the other hand, the difficulty of assembly is relatively large, it is difficult to realize automatic assembly, and the production cost is high
In addition, the needle holders in the prior art are all designed in one piece, and the sealing ring needs to be stretched before being placed on the needle holder, which brings great inconvenience to the assembly.

Method used

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  • Safety syringe capable of pulling back syringe needle
  • Safety syringe capable of pulling back syringe needle
  • Safety syringe capable of pulling back syringe needle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as Figure 1-3 As shown, the safety syringe which can pull back the injection needle includes a syringe 1 and an injection rod 2 arranged in the syringe 1 . A rubber stopper 3 is sheathed on the front end of the injection rod 2 , and a needle seat 4 is installed on the front end of the injection cylinder 1 . A positioning structure capable of preventing the axial forward movement of the needle holder 4 is provided between the syringe 1 and the needle holder 4 . The syringe 1 is provided with a limit ring 5 for preventing the needle seat 4 from moving backward in the axial direction.

[0030] Such as figure 2 , 3, 4 and 6, the center of the needle base 4 has a liquid hole 400. The needle base 4 is composed of a front base body 41 and a rear base body 42. The needle base 4 is provided with a sealing ring 6 capable of forming a seal with the front end of the syringe 1. The sealing ring 6 is arranged on the front base body 41 and the rear base body 42. between. ...

Embodiment 2

[0036] In this embodiment (figure omitted), the front end of the rear seat body 42 has a boss 42a that can be inserted into the rear end of the front seat body 41, and the above-mentioned annular groove 43 is formed between the rear end surface of the rear seat body 42 and the front end surface of the front seat body 41. Here, the rear end surface of the rear seat body 42 and the front end surface of the front seat body 41 are both planes. The rest are similar to those in Example 1, and will not be described in detail herein.

Embodiment 3

[0038] In this embodiment (figure omitted), the rear end of the front seat body 41 has a convex tube that can be inserted into the front end of the rear seat body 42, and the above-mentioned annular groove 43 is formed between the front end surface of the rear seat body 42 and the rear end surface of the front seat body 41. Here, the rear end surface of the rear seat body 42 and the front end surface of the front seat body 41 are both planes. The rest are similar to those in Example 2, and will not be described in detail herein.

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Abstract

The invention provides a safety syringe capable of pulling back a syringe needle, belonging to the technical field of medical apparatus and solving the problems that the existing safety syringe capable of pulling back a syringe needle has unreasonable design, is hard to realize automatic assembling and has higher production cost. The safety syringe capable of pulling back a syringe needle comprises a syringe barrel and a syringe rod arranged in the syringe barrel; the front end of the syringe rod is sleeved with a rubber stopper; the front end of the syringe barrel is provided with a needle head seat; the center of the needle head is provided with a liquid through hole; a positioning structure which can prevent the axial forward movement of the needle head seat; the syringe barrel is internally provided with a limiting ring used for preventing the axial backward movement of the needle head seat; the front end of the syringe rod can penetrate through the limiting ring and is connected with the needle head seat; and the limiting ring is fixedly connected with the inner wall of the syringe barrel by an easy fracture structure. The safety syringe capable of pulling back a syringe needle can realize axial positioning of the needle head seat, and has easy assembling and high working stability.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and relates to a syringe, in particular to a safety syringe with a retractable injection needle. Background technique [0002] In order to avoid virus cross-infection caused by using unhygienic syringes, disposable syringes have been widely used in the medical field. However, ordinary disposable syringes do not have technical measures that can only be used once and are not reused, which makes some medical units, especially a small number of individual medical clinics that are not very formal, free to exploit, secondary use, or even repeated use. phenomenon of use. For this reason, various disposable syringes with self-destruct function have been proposed by many people, but many syringes cannot really completely self-destruct. Although some have achieved self-destruction, the needles are still left in their original positions after use. Medical personnel are easily poked by sharp needle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/50A61M5/315A61M5/31
Inventor 王兴章江振标
Owner 王兴章
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