Patent Application
20090259195
1. Field of the Invention
The prepacked automatic retractable safety syringe is an invention of reducing injuries of needle stab and protecting a user's safety by loading liquor inside a vial in advance and depending on an action of a retractable plunger that can push the vial to compress a needle hub forward, then retracting the needle hub and the vial inside the barrel because of retraction of the retractable plunger and expansion of a spring when an injection is completed.
2. Description of the Prior Art
To control or clean various microbes within a human body and sift as well as examine diseases & symptoms, syringes, in general, are used as tools for injection and blood collection at a human body. Based on considerations in convenience in treatment, efficiency of management, correctness of pharmaceuticals, accuracy of doses, prevention of fake pharmaceuticals, and difference in products, utilization of prepacked injections has become an important tendency in development of the pharmaceutical industry. Despite a disposable barrel adopted for a conventional prepacked syringe with history of being used over 30 years, infected needle heads still are exposed. Thus far, there are 20 odd infectious diseases transmitted by blood like AIDS and B-type or C-type hepatitis with infected needle heads as channels that cause enormous economic and social costs for dealing with the sequential derivative problems after events of needle stab. In addition, patients having diabetes or users making injections punctually, after using syringes at other places such as offices, restaurants, or hotels, may discard used ones into common trash boxes or liter them everywhere, leading to exposure of infected needle heads that cause serious healthy problems in the society in case of injuries of needle stab to cleaners or children who catch needles.
Therefore, in addition to convenience in usage, the inventor, while actively researching safety syringes, deliberates healthy safety for users, cleaners, or even other people contacting infected needle head accidentally as a major objective in design that integrates a vial having prepacked injections in it with an automatic retractable syringe to keep a used needle hub and a vial retracted inside a barrel and to prevent exposure of an infected needle head causing injuries of needle stab to medical staffs, cleaners or any other people.
This invention of prepacked automatic retractable safety syringe comprises a needle hub with a needle tube and a rubber washer on it, a cap, a barrel, a spring, a vial, and a retractable plunger. With an injection completed, a retraction from the retractable plunger pushing and compressing the needle hub makes the spring drive the needle hub plus the vial inside the barrel and materializes a safer design.
The major objective of this invention of a prepacked automatic retractable safety syringe is to furnish a vial with prepacked injections in it to make the vial contained inside an automatically retractable safety syringe. Because of plural U-type slides at the end of the needle hub as a design offering space for movement of plural snap hooks inside slides, and the spring around the needle hub together with a retractable plunger as a tool to push the vial compressing the needle hub forward, the spring is able to drive snap hooks moving inside slides of the needle hub and finally complete a retractable motion.
As another objective of this prepacked automatic retractable safety syringe to prevent injuries of needle stab and infection, the vial that contains prepacked injections and being held inside an automatically retractable safety syringe can be compressed by the forward moving retractable plunger to drive the spring retracting the needle hub, the vial, and the front plunger back to the barrel after completion of an injection.
Another objective of this prepacked automatic retractable safety syringe with the vial containing prepacked injections and being held inside an automatically retractable safety syringe is to form a complete retractable safety syringe that a rear plunger with a bulge on it can be engaged with the barrel when a front plunger is retracted inside the rear plunger.
With an illustration of diagrams, the detailed description and technical content related to this invention is displayed as follows:
Firstly, refer to
Furthermore, the needle hub 13 containing a needle tube 131 with sharp heads at both ends and penetrating the center of the needle hub 13 has plural slides such as locating groove 131, ramp 132, rotation slide 133 and penetration slide 134 to form U-type slides for a retraction action. With snap hooks 110 at one end of the barrel 11 and the locating groove 131 forming a fastener, the snap hooks can be fixed inside the locating groove 131. When the spring 12 is further compressed, the snap hooks 110 can move along similar U-type slides formed by the locating groove 131, the ramp 132, the rotation slide 133, and the penetration slide 134 to make the needle hub 13 retracted to a reversed direction against the injection. At the other end of the needle hub 13, a disc-type retainer 135 with an annular concaved washer groove 1350 for cover of a rubber washer 14 has a function to contact inner circles inside an inner barrel 112 of the barrel 11 when the spring 12 is retracted.
Besides, the hollow barrel 11 has a fingergrip 111 at one end and plural inward snap hooks 110 with adequate tolerances for deformation at another end. When the syringe is unused, the snap hooks 110 securely hold the locating groove 131 of the needle hub 13; after the injection is finished, a retractable motion can be generated because a user's force along the direction of the needle hub 13 compresses the snap hooks 110 released from the groove between the needle hub 13 and the snap hooks 110.
Refer to
At usage of this syringe, the cylinder head 1600 connecting to the front plunger 160 of the retractable plunger 16 is fixed inside the adapter 1520 of the gasket 152 within the vial 15, and the retractable plunger 16 for fixing the vial 15 is placed inside the inner barrel 112 of the barrel 11 for a forward movement action. When the lower point 1301 of the needle tube 130 penetrates the rubber stopper 150 of the vial 15, the retractable plunger 16 is able to propel injections inside the vial 15 into a human body through the needle tube 130. Then, with injection completed, a user's force to push the retractable plunger 16 toward the direction of the needle hub 13 will make the snap hooks 110 originally clamping the locating groove 131 of the needle hub 13 move at one end of the needle hub 13 along U-type slides formed by the ramp 132, the rotation slide 133, and the penetration slide 134, and lead to extension of the spring 12, retracting the needle hub 13 and the vial 15 toward the reversed direction against the injection.
Refer to
For another case of embodiments of the retractable plunger 16′, because the front plunger 160′ with an annular concaved rib 1601′ around walls at one end, has a larger diameter than a diameter of the rear plunger 161′ with an annular raised rib 1611′ around walls of its inner edge, the concaved rib 1601′ of the front plunger 160′ is able to securely contact the raised rib 1611′ of the rear plunger 161′ when this structure is being assembled. In addition, when the retractable plunger 16′ is moved, the front plunger 160′ is able to slip into the outer rims of the rear plunger 161′.
Refer to
With the rear plunger 161 engaging the barrel 11, the function of the spring 12 to retract the needle hub 13, the vial 15 and the front plunger 160 inside the barrel 11 completes a cartridge-type safety syringe.
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