Retractable syringe with plunger disabling system

A technology of syringes and plungers, applied in the field of syringes and their plungers, which can solve the problems of not being able to install, dislike springs, and large springs, etc., and achieve a smooth feeling effect

Inactive Publication Date: 2007-03-14
UNITRACT SYRINGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the spring that drives the plunger and needle back may be too large to fit in the syringe
[0009] Additionally, some users dislike the feeling of the spring being gradually compressed as the plunger is depressed, which may discourage people from using spring-actuated retractable syringes

Method used

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  • Retractable syringe with plunger disabling system
  • Retractable syringe with plunger disabling system
  • Retractable syringe with plunger disabling system

Examples

Experimental program
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Effect test

Embodiment Construction

[0046] Referring to one embodiment shown in FIG. 1 , a retractable syringe 10 includes a barrel 20 , a plunger 30 operably positioned therein, and a needle mount 40 having a retractable needle 12 . The needle mount 40 is secured to the needle end 23 of the barrel 20 and has a barrel insertion portion 50 and an O-ring 55 . Finger grips 25A, 25B are provided at the plunger end 24 of the barrel 20 to which a collar 60 is mounted. The plunger 30 includes a first plunger element 31, a second plunger element 33 and a seal 34 fixed thereon, the first plunger element 31 has a user operation button 32, and the second plunger element 33 is easily releasable. Attachment of the first plunger element 31 cooperates to maintain the spring 70 in a compressed state until retraction of the needle holder 40 and needle 12 is required.

[0047] Referring now to FIG. 2 , the plunger 30 includes a first plunger element being a plunger rod 31 with a user operated button 32 and a second plunger eleme...

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Abstract

A retractable, single use syringe (10) comprises a barrel (20), a collar (60) mounted to the barrel, a retraction spring (70), a needle mount (40) located at a needle end (23) of the barrel and a plunger (30). The plunger comprises a first plunger member (31) and a second plunger member (33) that are releasably coupled to co-operatively maintain the retraction spring in an initial compressed state. The second plunger member (33) further comprises a seal (34) to prevent fluid leakage between plunger (30) and barrel (20). After depression of the plunger to deliver the fluid contents of the syringe, the first plunger member (31) engages the needle mount (40) with needle (12) attached thereto and is rotatably uncoupled from the second plunger member (33) to allow decompression of the retraction spring (70), which forces retraction of the first plunger member (31), needle mount (40) and needle (12) engaged therewith. The first plunger member (31) and the collar (60) comprise elements that co-operatively form a disabling means that prevents or at least minimizes the likelihood of subsequent depression or withdrawal of the plunger (30). Also following retraction of the first plunger member (31), the second plunger member (33) and seal (34) remains at the needle end (23) of the barrel (20) thereby preventing refilling and re-use of the syringe.

Description

technical field [0001] The present invention relates to syringes and plungers thereof. More specifically, the present invention relates to permanently retractable disposable syringes in which the plunger can be automatically disabled. Background technique [0002] The practice of sharing syringes between different users without adequate sterilization is a major factor in the spread of HIV and hepatitis viruses. Such diseases can have severe consequences for the sufferers, and society's provision of assistance and medical care for these sufferers requires substantial funding. [0003] Another important hazard associated with the use of unclean needles and syringes is needlestick injuries due to carelessness. This is a concern for law enforcement and paramedics who routinely encounter illicit drug users in their professional activities. In addition, illicit drug users are in the habit of leaving dangerous by-products of their activities in public areas, such as discarded sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/50A61M5/315
Inventor 约瑟夫·赫尔墨斯·卡奥克雷格·斯蒂芬·斯奥利戴明恩·贾德
Owner UNITRACT SYRINGE
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