Limit mechanism of needle holder in retraction type safety syringe

A technology of a safety syringe and a limiting mechanism, which is applied to hypodermic injection devices, needles, medicine devices, etc., can solve the problems of high assembly cost, unstable structure, and inability to form annular protrusions.

Active Publication Date: 2015-04-29
湖北科莱德医疗器械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited wall thickness of the syringe and the shallow depth of the ring groove, the structure is relatively unstable when the seal is stuck on the groove, and the seal is easily detached from the groove, causing the syringe to fail to use normally
Even if a higher protrusion is set on the inner wall of the syringe as a fixation, due to the limitation of the production mold, it cannot be made into a ring-shaped protrusion, but several separate protrusions, which requires that the needle seat and the syringe It is necessary to determine an angle before assembly or manual assembly, and the assembly cost is relatively high

Method used

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  • Limit mechanism of needle holder in retraction type safety syringe
  • Limit mechanism of needle holder in retraction type safety syringe
  • Limit mechanism of needle holder in retraction type safety syringe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as Figure 5 As shown, the syringe includes a syringe 1 and a cylindrical needle holder 2 fixed on the inner side of the upper end of the syringe 1. The inner side of the needle holder 2 has an annular protrusion-2b. During use, the needle head 4 is fixed on the needle seat 2, and a push rod 5 is arranged in the needle cylinder 1.

[0031] Such as Figure 4 As shown, in the retractable safety syringe, the stop mechanism between the needle holder and the needle cylinder is arranged between the needle cylinder 1 and the needle holder 2 .

[0032] In order to prevent the needle 4 from rotating or moving back and forth during use, there is a limiting unit 1 between the needle cylinder 1 and the needle holder 2 for limiting the upward movement of the needle holder 2, and between the needle cylinder 1 and the needle holder 2 there is a The limiting unit 2 restricts the downward movement of the needle base 2 , and a structure for preventing the needle base 2 from rotati...

Embodiment 2

[0048] This embodiment is similar to Embodiment 1, the difference is that in this embodiment, if Figure 10 and Figure 11 As shown, there is only one annular protrusion on the expander 3: annular protrusion three 3d; there are two annular protrusions on the push rod 5: annular protrusion five 5b and annular protrusion six 5c, the annular protrusion The fifth 5b is located on the upper side of the annular protrusion six 5c. When the syringe is used up, push the push rod 5 up to the bottom, the annular protrusion 5b on the push rod 5 crosses the annular protrusion 1 2b of the needle seat 2, and the annular protrusion 5c on the push rod 5 crosses the expansion The annular protrusion 3 3d of the piece 3. Thereafter, the push rod 5 is pulled back, and the annular protrusion 6 5c of the push rod 5 first abuts against the annular protrusion 3 3d of the expansion member 3 and drives the expansion member 3 to break away from the stopper 1b; after that, the push rod 5 The ring-shape...

Embodiment 3

[0050] This embodiment is similar to Embodiment 1, the difference is that in this embodiment, if Figure 12 As shown, the inner wall of the syringe 1 has a backstop protrusion 1e for preventing the expansion member 3 from moving down, and the backstop protrusion 1e is located on the lower side of the expansion part 3a and abuts against the expansion part 3a. As the specific shape of the anti-retreat protrusion 1e, the anti-retreat protrusion 1e can be set as a circular ring coaxial with the syringe 1, or can be set as a number of block-shaped anti-retreat protrusions evenly distributed on the inner wall of the syringe 1. from 1e. As another embodiment, the backstop protrusion 1e is used to prevent the needle holder 2 from moving down, and the backstop protrusion 1e abuts against the needle holder 2 . As another way, the anti-retreat protrusion can also be located on the expansion member, and there is an anti-retreat groove on the inner wall of the syringe that matches the sha...

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Abstract

The invention provides a limit mechanism of a needle holder in a retraction type safety syringe, belongs to the technical field of medical apparatus and instruments, and solves the problem that the position of needle holder in an existing syringe is unstable. The limit mechanism comprises a first limit unit and a second limit unit, wherein the first limit unit is disposed between the syringe and the needle holder and used for limiting the needle holder from moving upwardly and the second limit unit is disposed between the syringe and the needle holder and used for limiting the needle holder from moving downwardly. A protruding shoulder is disposed on the inner lateral wall of the syringe. The lower side of the protruding shoulder is provided with a limit part which extends downwardly. The second limit unit comprises the limit part and an expansion part located in the syringe, wherein the expansion part is provided with an annular expansion portion, the expansion portion is located between the limit part and the lateral wall of the syringe and abutted against the limit part, and the limit part is bent inwardly and abutted against the needle holder. The limit mechanism has the advantages that the limit part which extends downwardly is disposed on the lateral wall of the syringe, so that the needle holder is stably limited in the syringe under the action of the expansion part.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and relates to a syringe, in particular to a position-limiting mechanism for a needle seat in a retractable safety syringe. Background technique [0002] Currently, syringes are the most commonly used and one of the most used medical devices. In recent years, in order to control iatrogenic infectious diseases and avoid adverse consequences such as cross-infection, disposable sterile syringes have been widely used. However, existing disposable syringes all have defects such as being intact after use, reusable, without any safety device, and exposed after injection. On the one hand, it is easy to be used by malicious elements, and the reuse of discarded disposable syringes after use is very easy to cause the spread of viruses and cross-infection; on the other hand, the needles after injection are still left outside. Not only does it cause inconvenience to the handling and destruction of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/34A61M5/50
CPCA61M5/34A61M5/50A61M5/5013A61M2205/273
Inventor 徐雪花
Owner 湖北科莱德医疗器械有限公司
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