LUER-LOCK FASTENING NEEDLE HUB

Abstract

A Luer-lock fastening needle hub is proposed. The Luer-lock fastening needle hub has an insertion groove for a front end of a tapered tube of a barrel to receive the tapered tube into which a plunger is inserted, so that a plunger contact surface is inserted into the tapered tube of a front discharge end of the barrel. The Luer-lock fastening needle hub has a needle cap fastening grooves formed along an outer circumference thereof and “V”-shaped insertion guides are formed in four direction at front portions of openings of the needle cap fastening grooves, so that fastening protrusions formed on an inner surface of a needle cap are unaffectedly guided by the “V”-shaped insertion guides and are easily aligned and fastened to the needle cap fastening grooves.

Claims

1. A Luer-lock fastening needle hub comprising: a barrel (1) comprising a finger grip (2) at a rear end thereof and a Luer-lock connector (4) at a front discharge end thereof, in which a thread portion (5) is formed on an inner surface of the Luer-lock connector outside a tapered tube (3); a plunger rod (6) inserted into an inside of the barrel (1) and comprising a push end (7) at a rear end thereof; a plunger (9) coupled to a front end of the plunger rod (6); and a needle hub (H) screwed and fastened to the Luer-lock connector (4) and comprising an injection needle (12) mounted to a front end thereof, wherein, in the needle hub (H), an insertion groove (13) for the tapered tube (3) of the barrel (1) is formed on an inner diameter portion (19) into which the tapered tube (3) of the front discharge end of the barrel (1) is inserted, so that a plunger contact surface (20) is inserted into the tapered tube (3) of the front discharge end of the barrel (1) to be brought into close contact with a reduced diameter front end surface of the plunger (9) without clearance.

2. The Luer-lock fastening needle hub of claim 1, wherein a plunger contact surface (201) that is inserted into the tapered tube (3) of the front discharge end of the barrel (1) is formed in a recessed “V” shape.

3. The Luer-lock fastening needle hub of claim 1, wherein needle cap fastening grooves (21) are formed along an outer circumference of the needle hub (H), and “V”-shaped insertion guides (22) are famed in four directions at front portions of openings of the needle cap fastening grooves (21) so that fastening protrusions (23) formed on an inner surface of a needle cap (C) are unaffectedly guided by the insertion guides (22) and easily aligned and fastened to the needle cap fastening grooves (21).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other objectives, features, and other advantages of the present disclosure will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:

[0015] FIG. 1 is a partially cutaway side view showing a fastened state of a syringe having a reuse prevention structure according to the present disclosure;

[0016] FIG. 2 is disassembled perspective view showing the syringe having the reuse prevention structure according to the present disclosure;

[0017] FIG. 3 is a perspective view showing a Luer-lock fastening needle hub according to the present disclosure;

[0018] FIG. 4 is an enlarged sectional view showing a main part of the assembled syringe having the reuse prevention structure according to an embodiment of the present disclosure; and

[0019] FIG. 5 is an enlarged sectional view showing a main part of the assembled syringe according to another embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE INVENTION

[0020] The above and other objectives, features, and advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings.

[0021] In the flowing description, unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0022] Hereinbelow, a Luer-lock fastening needle hub according to an exemplary embodiment of the present disclosure will be described in detail with reference to accompanying drawings.

[0023] As shown in the drawings, a Luer-lock fastening needle hub H constitutes a Luer-lock fastening type syringe having a reuse prevention structure. A barrel 1 has a finger grip 2 at a rear end thereof and a Luer-lock connector 4 in which a thread portion 5 is formed an inner surface outside a tapered tube 3 of a front discharge end thereof, and a plunger rod 6 having a push end 7 at a rear end thereof is inserted into the barrel 1. Whereby, a plunger fastening protrusion 8 at a front end of the plunger rod 6 is fitted into a plunger fastening closed hole 10 formed inside a rear end of a plunger 9 to couple the plunger rod 6 to the plunger 9.

[0024] Meanwhile, fastening protrusion steps 11, which are formed by protruding on an opposite sides of a rear ends of the needle hub H to correspond to the thread portion 5 of the Luer-lock connector 4 formed on the front end of the barrel 1, passes through and joins to the thread portion 5, so that the needle hub H is fastened to the barrel 1. An injection needle 12 is fastened to a front end of the needle hub H by passing through an inside of the needle hub H. An insertion groove 13 for the tapered tube of the barrel is formed in of a rear portion of the needle hub H. The tapered tube 3 of the barrel 1 is inserted into the insertion groove 13 with the screwing and Luer-lock fastening of the needle hub H, so that the needle hub H to which the injection needle 12 is mounted and the barrel 1 are fastened to each other. In configuring the plunger 9, the plunger 9 is formed in a tapered long conical shape made of rubber or silicone, the plunger 9 consists of a three-step structure in which an outer diameter of the plunger 9 is gradually reduced and an interval between the steps is shortened as the plunger 9 goes frontward to a first step 14a, a second step 14b, and a third step 14c. Corresponding to the structure of the plunger 9, a first diameter reduction portion 16a, a second diameter reduction portion 16b, and a third diameter reduction portion 16c are formed on an inner surface of a liquid discharge hole 15 inside the tapered tube 3 of the barrel 1, and the structure of the diameter reduction portions is formed such that a diameter thereof is reduced and an interval between the diameter reduction portions is shortened as the tapered tube 3 goes frontward, so that the tapered tube 3 may correspond and be coupled to the plunger 9.

[0025] In addition, in order to realize the reuse prevention structure, the needle hub H is fastened to a syringe protector main body 17 having a cover 18, and is assembled at a front portion thereof to a needle cap C for covering the injection needle 12.

[0026] In the above structure, in the needle hub H, the insertion groove 13 is formed inside an inner diameter portion 19 into which the tapered tube 3 of the front discharge end of the barrel 1 is inserted, so that a plunger contact surface 20 is inserted into the tapered tube 3 at the front discharge end of the barrel 1 to be brought into close contact with a reduced diameter front end surface of the plunger 9 without clearance.

[0027] FIG. 5 is an enlarged sectional view showing a main part of the assembled syringe according to another embodiment of the present disclosure. The insertion groove 13 for the tapered tube of the barrel 1 is formed, and a plunger contact surface 201 configured to be inserted into the tapered tube 3 of the front discharge end of the barrel 1 is formed in a recessed “V” shape and a front end section of the plunger 9 is also formed in a shape protruding in a “V” shape corresponding to the shape of the plunger contact surface 201, so that the barrel and the needle hub are fastened to each other without clearance.

[0028] Meanwhile, needle cap fastening grooves 21 are formed along an outer circumference of the needle hub H. In the needle cap fastening grooves 21, “V”-shaped insertion guides 22 are formed in four directions at a front portions of opening of the needle cap fastening grooves 21, so that fastening protrusions 23 famed on an inner surface of the needle cap C may be unaffectedly guided and easily aligned and fastened to the needle cap fastening grooves 21.

[0029] In the syringe having the above described structure, when the injection needle 12 is injected into a separate medicinal liquid container and the plunger rod 6 is pulled as usual use of a syringe, the plunger 9 fastened to the front end of the plunger rod 6 moves rearward in the cylinder and liquid medicine is filled into the barrel 1. When the barrel 1 is filled with the liquid medicine, the plunger rod 6 is pushed while the injection needle 12 is inserted in the skin of a patient, so that the plunger 9 is moved forward along the inside of the barrel 1 to push the injection filled in the barrel to be discharged through the injection needle 12 to complete the injection. When the plunger 9 reaches an end of the barrel 1, the plunger 9 is fully inserted into the discharge hole 15 inside the tapered tube 3 of the barrel 1.

[0030] As the first step 14a, the second step 14b, and the third step 14c of the plunger 9 are brought into contact with the first diameter reduction portion 16a, the second diameter reduction portion 16b, and the third diameter reduction portion 16c formed in the discharge hole 15 inside the tapered tube 3 of the barrel 1 in order, all the remaining injection is discharged through the injection needle 12. The plunger 9 is formed in the long conical shape and has a multiple-step structure consisting of a plurality of steps in which an interval between steps is shortened as the plunger goes frontward, so that the pressure is distributed sequentially to reduce the reaction pressure applied to the plunger 9. Accordingly, the injection may be injected with smooth and constant pressure until the end of the injection without an effort, reducing pain for the patient. At the same time, in the needle hub H, the insertion groove 13 is formed inside the inner diameter portion 19 into which the tapered tube 3 of the front discharge end of the barrel 1 is inserted. Accordingly, the plunger contact surface 20 is unaffectedly inserted into the tapered tube 3 of the front discharge end of the barrel 1 to be brought into close contact with the reduced diameter front end surface of the plunger 9, so that the entire amount of injection liquid may be injected without the remaining injection liquid in the syringe.

[0031] In the needle cap fastening grooves 21 provided along the outer circumference of the needle hub H, the “V”-shaped insertion guides 22 are formed in four directions at the front portions of the openings of the needle cap fastening grooves 21, so that the fastening protrusions 23 formed on the inner surface of the needle cap C are unaffectedly guided and easily aligned and fastened to the needle cap fastening grooves 21. Therefore, even when the needle cap C is roughly aligned and fastened to the needle hub, the needle cap C may be guided by the “V”-shaped insertion guides 22 to make the fastening easily and precisely.

[0032] Although the invention is described with reference to specific items such as specific structural elements, to merely some embodiments, and to drawings, such specific details disclosed herein are merely representative for purposes of helping more comprehensive understanding of the present disclosure. The present disclosure, however, is not limited to only the example embodiments set forth herein, and those skilled in the art will appreciate that the present disclosure can be embodied in many alternate forms.

[0033] Accordingly, the present disclosure is intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments that may be included within the spirit and scope of the present disclosure as defined by the appended claims.