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retractable syringe

A technology of a syringe and a compression spring, applied in the field of retractable safety syringes, can solve the problems of fluid leakage, high cost, complicated syringes, etc., and achieve the effects of eliminating leakage, economical structure, and simplification of the syringe.

Active Publication Date: 2021-11-09
C-LA中国有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of such retractable syringes is that they are prone to fluid leakage and the mechanism is susceptible to operational reliability issues
[0007] Syringes of other designs are relatively complex and difficult or expensive to manufacture
There are other syringe designs that do not allow for complete dispensing of injectable fluid due to dead space left in the syringe barrel

Method used

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Examples

Experimental program
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Embodiment Construction

[0019] The invention may be embodied by locating the working member at the "dispensing" end of a retractable hypodermic syringe. The present invention can be better understood in conjunction with the accompanying drawings.

[0020] see figure 1 , showing the automatically retractable syringe 5 . The main components of the syringe are barrel 10 , plunger 15 , gland 20 and needle 25 . The gland 20 is inserted into the cylinder body 10 in a press-fit manner to accommodate the needle hub assembly. The gland can also be screwed in.

[0021] The needle hub assembly includes a needle hub 30 into which the needle 25 is inserted. A sliding activation sleeve 35 fits around the needle hub with a partially compressed spring 40 disposed between these two parts. The spring 40 is in contact with the stepped rearwardly facing surface 45 of the hub and the inwardly stepped surface 50 of the sleeve 35 . Thus, the effect of the spring is to tend to push the hub 30 rearwardly relative to th...

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Abstract

An automatically retractable syringe has a barrel and a plunger in combination with an otherwise secured needle hub such that a biasing element can push the needle hub into a cavity in the plunger.

Description

technical field [0001] The invention relates to the field of hypodermic syringe manufacture. In particular, the present invention relates to a retractable safety syringe in which the needle can be retracted into the syringe barrel after use by a spring or similar mechanism. Background technique [0002] Safety syringes for hypodermic needles are becoming a very important healthcare tool. The syringe's ability to prevent needlestick injuries is extremely important in preventing the spread of blood-borne diseases. [0003] One specific type of safety syringe is a retractable syringe. This is a syringe that is provided with a mechanical device, usually a spring, that is activated after fluid injection is complete whereby the spring works to retract the needle within the syringe barrel. This prevents the needle from causing a needlestick injury and, in particular, allows the needle operator to retract the needle with a one-handed operation, making it easier to administer inje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M5/178A61M5/32A61M5/50
Inventor 艾伦·沃尔什
Owner C-LA中国有限公司
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