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Needle retraction type safety injector

A safety syringe and needle technology, applied in the directions of syringes, hypodermic injection devices, infusion sets, etc., can solve the problems of inconvenient mass production, unreasonable concave-convex matching structure, and high precision, and achieve the effects of easy mass production, easy detachment, and easy assembly.

Active Publication Date: 2007-02-14
SHANGHAI SOL MILLENNIUM MEDICAL PRODUCTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Syringes are an indispensable tool in medical treatment. In order to avoid cross-infection of blood, the current syringes are all disposable syringes. However, after the syringe is injected, if the needle is still outside the syringe, it will be injured during its destruction. Staff, thus causing secondary cross-infection, in order to solve the above problems, people have developed a variety of syringes in which the needle can be retracted into the syringe after the injection is completed, and many of them have obtained patents. See various safety syringe patents, Mostly, a concave-convex fit is set between the front end of the syringe push rod and the needle seat. When the push rod is pushed to the front end of the syringe after injection, the push rod is combined with the needle seat. When the push rod is pulled back, the needle The seat is separated from the head of the syringe, and the needle seat and the needle are retracted into the syringe to prevent the needle from hurting people
However, in the syringe of this structure, after the push rod is combined with the needle seat, the situation that the push rod is separated from the needle seat when pulling back occurs from time to time. ; Second, the force required to separate the needle seat from the head of the syringe is relatively large, and the needle seat is not easy to withdraw; the third is that the precision requirements are high, the mold is difficult to develop, and it is not convenient for mass production

Method used

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  • Needle retraction type safety injector
  • Needle retraction type safety injector
  • Needle retraction type safety injector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: see figure 1 , Figure 9 Shown: the present invention comprises a hollow syringe 1, push rod 2, rubber plug 3, needle seat 4, elastic connection needle seat 5, support seat 6, sealing rubber plug 7, card core 8, needle seat 4 and elastic connection needle The seat 5 is connected, and the elastic connection needle seat 5 is limited by the support seat 6 on the upper end of the syringe 1,

[0036] see Figure 10 There is a circle of grooves 111 on the inner side of the upper end of the syringe 1, a circle of bosses 112 are arranged under the groove 111, an inclined convex step 113 is arranged on the inner side of the lower end of the syringe 1, and an inclined groove 114 is arranged on the inner side of the end of the syringe 1. The slot 114 and the inner wall of the syringe 1 form a slope 115 .

[0037] see Figure 11 , Figure 12 , the elastic connection needle base 5 is provided with an inner cavity 511 through which the injection liquid passes, and ...

Embodiment 2

[0045] See Figure 20, Figure 21 , Fig. 22, another structure of the elastic coupling needle base 5 is given in this embodiment, the structure of the elastic coupling needle base 5 is basically the same as the elastic coupling needle base 5 shown in Embodiment 1, the difference is that A circle 5112 is arranged on the upper end surface of the joint between the elastic support claw 512 and the supporting foot 513, and a sealing ring 5113 is arranged between the outer side of the circle 5112 and the inner wall of the syringe 1 accordingly.

[0046] Other structures in this embodiment are the same as those in Embodiment 1.

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Abstract

A high-safety injector with withdrawn needle is disclosed. The elastic supporting jaws with external convex step and supporting legs with flange at lower end are formed at lower end of elastic needle holder. The injection tube with internal slot matched with said convex step of supporting jaw. A supporting seat has the external convex step is contact with said supporting jaws, the internal upper flange matched with the flange of said supporting leg, and the lower supporting arm with elastic ratchets and close to said supporting leg. The fastening core has a conic table matched with said elastic ratchets.

Description

technical field [0001] The invention relates to a medical syringe, in particular to a medical syringe in which the needle can be retracted without being pulled out by a doctor, and the needle is hidden after use so that it will not be exposed and hurt people. Background technique [0002] Syringes are an indispensable tool in medical treatment. In order to avoid cross-infection of blood, the current syringes are all disposable syringes. However, after the syringe is injected, if the needle is still outside the syringe, it will be injured during its destruction. Staff, thus causing secondary cross-infection, in order to solve the above problems, people have developed a variety of syringes in which the needle can be retracted into the syringe after the injection is completed, and many of them have obtained patents. See various safety syringe patents, Mostly, a concave-convex fit is set between the front end of the syringe push rod and the needle seat. When the push rod is push...

Claims

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Application Information

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IPC IPC(8): A61M5/31A61M5/50A61M5/178
CPCA61M5/322A61M2005/31516A61M2005/31508
Inventor 林作钱
Owner SHANGHAI SOL MILLENNIUM MEDICAL PRODUCTS CO LTD
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