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Low-residual safe self-destructing injector

A syringe and low-residue technology, applied in the field of medical devices, can solve problems such as difficulty in air bubble discharge, cross-infection, and injection residue

Inactive Publication Date: 2009-06-03
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 products, but this kind of disposable syringes can be reused if they are not artificially destroyed. Disposable syringes are reused to cause cross-infection and spread diseases, and many syringes have emerged as the times require
For example, the push rod is provided with a clip that engages with the syringe. When the injection is completed, the push rod engages with the syringe, so that the push rod is locked in the syringe and cannot be used again, thereby achieving the purpose of self-destruction. The front end of the plunger is not on the zero line (that is, the plunger is not pushed to the bottom) before the liquid (blood) is drawn, so when the liquid is drawn (especially in the blood), on the one hand, the dose of the drawn liquid (blood) is not standard, On the other hand, when the syringe is not in use, there is more air in the syringe. The head of the push rod of this type of syringe is higher than the rubber stopper. When the liquid is drawn, air bubbles will be generated on the top of the rubber stopper, which is difficult to discharge, especially for insulin syringes. This type of small-dose syringe, it is more difficult for the air bubbles to be discharged. In addition, this type of syringe has injection liquid residue after injection, which cannot meet the low residue standard.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] see figure 1 , figure 2 , image 3 , the present invention comprises a hollow syringe 1, a push rod 2 sliding in the syringe, a rubber plug 3 mounted on the front end of the push rod, a needle holder 4 is installed on the front end of the syringe 1, and the needle holder 4 is supported by a support seat 5 , the lower end of the support seat 5 is in interference fit with the inner wall of the syringe, the inner side of the support seat 5 is provided with an elastic claw 6, and the front end of the push rod 2 is connected to the cone 8 through the core 7 passing through the rubber plug 3, after the injection of the cone 8 is completed Engage with the elastic claw 6.

[0034] The bottom of the cone 8 at the front end of the push rod 2 collides with the top 3 of the rubber plug when it is not injected, and the rubber plug 3 is hollow (see Figure 10). The push rod is provided with a stopper 10 that pushes against the rubber plug, and the stopper 10 also plays a role in f...

Embodiment 2

[0041] The syringe shown in this embodiment has the same structure except that the structure of the rubber stopper is different from Example 1.

[0042] Referring to Fig. 18 and Fig. 19, the rubber plug 3' in this embodiment is also a hollow type, the difference is that a ring of flange 9' is formed on the lower part of the rubber plug, and the stopper 10 is located under the flange 9', and is connected with the flange The edge 9' is opposed to each other, and the core 7 of the push rod is provided with a second stopper 10', and the second stopper 10' is located in the hollow cavity of the rubber plug 3' and is close to the flange 9'. There is a large gap between the inner wall of the rubber plug 3' and the card core 7, that is, the wall of the rubber plug 3' is relatively thin, and the rubber plug is compressed and deformed by the reaction force generated by the injection liquid and the thrust of the stopper 10 during injection. Due to the effect of the second stopper 10', on...

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PUM

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Abstract

The invention relates to a low-residual safe self-destructing injector comprising a hollow syringe, a push rod sliding in the syringe and a rubber plug arranged at the front end of the push rod. The front end of the syringe is provided with a needle seat supported by a support base, an elastic claw is arranged at the inner side of the support base, and the front end of the push rod is provided with a frustum clamped with the elastic claw after injection. The injector is characterized in that a cone base of the frustum is contacted and connected with the top of the rubber plug when the injection is not performed; the rubber plug is interiorly hollow; the push rod is provided with a blocking piece for pushing and blocking the rubber plug; during the injection, the rubber plug is compressed and deforms due to counterforce generated by injection liquid and push force of the blocking piece, and at the same moment, the frustum at the front end of the push rod axially extend forward along the push rod; and after the injection, the frustum can be clamped and combined with the elastic claw. After the adoption of the structure, as the cone base of the frustum is contacted and connected with the top of the rubber plug when the injection is not performed and a higher part of the frustum is short, extracted liquid generates no foam at the top of the rubber plug, gas discharge suffers no blockage and is smooth after the liquid extraction, and little residual of injection liquid is left in the syringe after the injection; and the invention is in particular applicable to injectors such as insulin syringes with small dosage.

Description

technical field [0001] The invention belongs to a medical appliance, in particular to a disposable safety self-destruction syringe. 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 products, but this kind of disposable syringes can be reused if they are not artificially destroyed. Disposable syringes are reused to cause cross-infection and spread diseases, and many syringes have emerged as the times require. For example, the push rod is provided with a clip that engages with the syringe. When the injection is completed, the push rod engages with the syringe, so that the push rod is locked in the syringe and cannot be used again, thereby achieving the purpose of self-destruction, but this The front end of the piston of the syringe is not on the zero line before the liquid (blood) is drawn (that is, the piston is not pushed to the bottom), so when the liqu...

Claims

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Application Information

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IPC IPC(8): A61M5/50A61M5/31
CPCA61M5/322A61M2005/323
Inventor 林作钱
Owner SHANGHAI SOL MILLENNIUM MEDICAL PRODUCTS CO LTD