Patent Application
20150148755
1. Field of the Invention
The present invention relates to a syringe, and more particularly to a syringe whose connector and needle assembly are effectively positionable.
2. Description of the Prior Art
In many areas of the world, a lot of medical personnel and personnel to handle medical waste might be hurt by needles due to inadequate handling of syringes, and therefore might be infected with diseases such as AIDS, hepatitis B, pulmonary tuberculosis (TB) et al. According to statistical data, unsafe injection can cause 1.3 millions of deaths per year all over the world, resulting in hundres billion of medical expenses. Unsafe injection is meant that unsafe injection acts that are applied to patients or carried out by medical personnel or carried out in risky public environment, for example, reuse of throw-away type syringes, defects of aseptic operation such as needle sharing behaviors and improper handling of medical waste et al. To avoid those mentioned above, various types of safety syringes are available in the market. In a safety syringe, the needle assembly is installed to the barrel and can be withdrawn back into the barrel after used. Accordingly, the inventor has researched for year to provide a syringe which is throw-away type and sanitary, and which is designed in a structure that is constructed of few elements.
The present invention is, therefore, arisen to obviate or at least mitigate the above mentioned disadvantages.
An object of the present invention is to provide a syringe which is designed in a structure that is constructed of few elements and, however, can ensure entire withdraw of a needle assembly back into the interior of the syringe so as to avoid resue of the syringe.
Another object of the present invention is to provide a syringe whose connector and barrel have cooperatively positionable structures, which can effectively restrict rotation of the connector, so as to avoid disengagement of the connector from the barrel due to improper operation of the needle assembly.
To achieve the above and other objects, a syringe is provided. The syringe includes a barrel, a connector and a plunger. A front end of the barrel has an annular blocking portion, wherein the annular blocking portion has at least two projections and at least two engaging slots defined by the projections, and one side of each projection formed with a guiding face. The connector is assembled to the front end of the barrel, wherein the connector has at least two blocking members arranged circumferentially, and one side of each blocking member is formed with an incline. The blocking members are respectively received in the engaging slots and blocked by the projections so as to restrict rotation of the connector. The plunger is movably received in the barrel, wherein a front end thereof is movable and abuttable correspondingly against the bottom of the connector, and the front end of the plunger is connected with the bottom of the connector. When the connector is assembled into the front end of the barrel, the blocking members and the projections are guided to be blockably positioned through contact of the guiding faces and the inclines.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention.
As shown in
The front end 20 of the barrel 2 has a protrusion 28 protruding from a lower edge of the conical annular groove 27. The bottom of the connector 3 is blocked by the protrusion 28, so as to firmly block the connector 3 at the front end 20 of the barrel 2. The front end 20 of the barrel 2 is formed with a threaded portion 29 for threading connection of a needle assembly (as shown in
As shown in
As the connector 3 is assembled into the front end 20 of the barrel 2, the blocking members 35 and the projections 23 are guided to be blockably positioned through contact of every corresponding guiding face 230 and incline 350. As a result, the blocking member 35 can be engaged correspondingly with the engaging slot 25 and blocked by the projection 23, so as to blockably position the blocking member 35 and the projection 23 and avoid oppositely impact of the blocking member 35 and the projection 23 and damage.
As shown in
The plunger 5 is movably received in the barrel 2, the front end 50 of the plunger 5 is movable and abuttable correspondingly against and connected with the bottom of the connector 3. Specifically, the front end 50 of the plunger 5 has a piston 52 and a rod member 54 which is protrusive outside the piston 52. The piston 52 is movable and abuttable correspondingly against the bottom of the connector 3, and the piston 52 is fitted to the recessed portion 33 of the connector 3. Whereby, the injection liquid in the syringe can be effectively delivered into the extending member 31 of the connector 3, and it ensures that the injection liquid can be entirely delivered into the needle assembly (as shown in
As shown in
In sum, through contact of the guiding faces and the inclines, the blocking members and the projections are guided to be blockably positioned quickly, and it can avoid oppositely impact of the blocking member and the projection and damage, so as to avoid disengagement of the connector from the barrel due to improper operation of the needle assembly. Furthermore, it can ensure entire withdraw of a needle assembly back into the interior of the syringe, and thus it is safe and sanitary. Moreover, the syringe of the invention not only has few emenmets but also can ensure that the connector and the needle assembly be certainly withdrawn back and blocked in the barrel 2, avoiding resue of the syringe.
Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
