WO2008019544A1 - Improved self-destruction syringe - Google Patents

Abstract

An improved self-destruction syringe comprises a hollow cylinder (1), a plunger rod (2) sliding in the hollow cylinder (1), and a rubber stopper (3) mounted at the front end of the plunger rod (2). The diameter of the front end of the hollow cylinder (1) reduces gradually and the front end of the hollow cylinder (1) is molded with a connection needle ferrule (4) which is connected with the needle hub (6) mounted with a needle (5). A locking core (8) being capable of blocking the inner cavity of the connection needle ferrule (4) is disposed at the front end of the plunger rod (2). The inner wall of the connection needle ferrule (4) is molded with the elastic pawl (7) converging towards the center. A cone (9) for locked engagement with the elastic pawl (7) is molded on the locking core (8).

Description

 An improved self-destructing syringe

Technical field

 The present invention pertains to a medical device, and in particular to a disposable self-destructing syringe.

Background technique

 Syringes are an indispensable tool for medical treatment. In order to avoid cross-contamination of blood, today's syringes use disposable products, but such disposable syringes can be reused if they are not artificially destroyed. Existing disposable syringes have been re-used to cause cross-contamination, spread diseases, and many self-destructive disposable syringes have emerged. For example, a self-destructing syringe with a card core and a push rod structure is mainly composed of: a hollow needle tube, a push rod mounted in the needle tube, and a rubber plug mounted on the front end of the push rod, the needle tube The front end is formed with a needle seat, a needle is mounted on the needle seat, and a convex ring is formed in the inner cavity of the needle seat; a card core is disposed at the front end of the push rod, and the push rod and the card core are separated structures, and the card core is mounted on the push rod The front end is symmetrically formed with two barbed protrusions on the surface thereof, and the protrusion can be inserted into the cavity at the front end of the convex ring, and the card core can block the inner cavity of the needle seat; There is a through hole, and the position of the through hole corresponds to the protrusion. When the pushing is completed, the card core will pass through the convex ring of the inner cavity of the needle seat into the cavity of the needle seat, and the protrusion will be caught on the outer side surface of the convex ring, thereby hindering the card core from moving backward. Separate the card core from the push rod, and finally force the push rod to break in the defect portion of the push rod to destroy the push rod and achieve self-destruction. The above patent has the following disadvantages: Firstly, in the production of highly sophisticated medical equipment, the card core is small in size, complicated in structure, and difficult to open the mold; and the card core is separated from the push rod, and the processing process is complicated, thereby increasing the mold. Cost, secondly, the amount of liquid remaining after the injection is completed.

Summary of the invention

The technical problem to be solved by the present invention is: to provide an improved self-destructing syringe, which The syringe has a simple structure, the card core and the needle seat are conveniently and accurately assembled, the mold is easy to manufacture, and the assembly is more convenient.

 In order to solve the above technical problems, the present invention adopts the following technical solutions: An improved self-destructing syringe comprising a hollow needle, a push rod sliding in the needle and a rubber plug mounted on the front end of the push rod, the syringe The front end is gradually reduced in diameter and formed with a coupling needle seat. The coupling needle seat is connected with a needle holder equipped with an injection needle, and a card core is disposed at the front end of the push rod, and the card core can block the inner cavity of the coupling needle seat, and is characterized in that The inner wall of the coupling hub is formed with an elastic pawl that gathers toward the center, and the card core is formed with a frustum that can be engaged with the elastic pawl.

 With the syringe of this structure, the structure of the card core is simpler, the manufacture of the mold is simplified, the high precision during processing can be better satisfied, and the cost is saved. On the other hand, the elasticity of the inner wall of the coupling needle seat is formed. The pawl allows the card core to be easily and accurately engaged with the core during the pushing process to achieve self-destruction.

 In order to solve the above technical problems, the present invention employs the following further technical solution: The elastic pawl is located at an intermediate portion of the coupling hub, and correspondingly the frustum is located at an intermediate portion of the card core.这种With this structure, since the elastic pawl is located at the middle portion of the coupling needle seat, its engagement with the card core can be completed in the coupling needle seat, without causing the card core to extend out of the coupling needle seat and hit the needle holder, resulting in The phenomenon that the needle seat is detached.

 The elastic pawl is injection molded integrally with the inner wall of the coupling hub.这种With this structure, the needle can be molded in one shot, making the syringe easier to manufacture, easier to assemble, and more cost effective.

 The push rod is provided with a plurality of break points. After the easy break point is set, when the push rod is pulled backwards after the injection, it can be broken or broken along the frangible point to achieve the purpose of complete self-destruction.

a lower portion of the push rod is provided with a thrust block, and correspondingly, a lower portion of the push rod is provided with the thrust block The through hole, the thrust block and the inner wall of the through hole are integrally connected with the push rod by two easy break points, and the thrust block rotates along the end point. The installation of the thrust block prevents the syringe from self-destructing due to misoperation before transporting and pumping liquid.

DRAWINGS

 Figure 1 is a cross-sectional view showing the unused state of the present invention;

 Figure 2 is a cross-sectional view showing the state before pushing liquid of the present invention;

 Figure 3 is a cross-sectional view showing the first step of pushing and self-destructing of the present invention;

 Figure 4 is a cross-sectional view showing the self-destruction of the present invention;

 Figure 5 is a top view of the coupling hub;

 Figure 6. is a cross-sectional view of the needle;

 Figure 7, is a partial enlarged view of Figure 6;

 Figure 8, is a schematic structural view of the push rod of the present invention;

 Figure 9, is a view of the K direction of Figure 8;

 Figure 10 is a schematic view of the structure of the handle;

 Figure 11 is a cross-sectional view taken along line D-D of Figure 10;

 Figure 12 is a cross-sectional view taken along line Ε-Ε· of Figure 10;

 Figure 13 is a partial enlarged view of Figure 1. detailed description

Referring to Figures 1 and 13, the present invention comprises a hollow needle 1 , a push rod 2 sliding in the needle 1 and a rubber plug 3 mounted on the front end of the push rod 2, the front end of the needle 1 being gradually reduced in diameter and formed The coupling needle seat 4 is connected to the needle holder 6 equipped with the injection needle 5, and here, the coupling needle holder 4 can be configured with a threaded head structure or a center head structure, taking into consideration the needle holder 6 and the coupling. Between the needle holders 4, relying solely on the static friction between the two to achieve the connection, it may fall off during use. To avoid this phenomenon, it is preferred. With the threaded head structure, the flange at the bottom of the needle holder 6 is threadedly engaged with the coupling needle seat 4, thereby achieving the purpose of fixing.

 Referring to Figures 5, 6, and 7, the inner wall of the coupling hub 4 is formed with elastic pawls 7 that are gathered toward the center, and at least two elastic pawls 7, in order to make the manufacture of the syringe simpler and reduce the cost, the elasticity The pawl 7 is injection molded integrally with the inner wall of the coupling hub 4.

 Referring to Fig. 8, the push rod 2 has a card core at the front end, and the card core 8 can be injection molded with the push rod 2; the core 8 is formed with a frustum 9 which can be engaged with the elastic pawl 7. When the push rod 2 is advanced, the core 8 and the frustum 9 pass through the elastic pawl 7. When the push rod 2 is pulled back, the elastic pawl 7 abuts against the lower end surface of the frustum 9 to make the card The core 8 cannot be pumped back, and the core 8 can block the inner cavity of the coupling hub 4 to complete the first step of self-destruction.

 In order not to cause the card core 8 to protrude from the coupling hub 4 and hit the needle holder 6, the needle holder 6 is detached. The elastic pawl 7 is located at an intermediate portion of the coupling hub 4, and correspondingly the frustum 9 is located at an intermediate portion of the card core 8. The length of the card core 8 is less than or equal to the length of the coupling hub 4, since the elastic pawl 7 is located at the coupling hub 4 The intermediate portion, the engagement with the card core 8, can be completed in the coupling hub 4.

 The push rod 2 is provided with a plurality of break points. In this embodiment, three easy break points A, B, and C are provided. When the push rod 2 is pulled backwards after the injection is completed, the break point can be pulled along the frangible point. The push rod 2 can not be used again, and the purpose of complete self-destruction is achieved.

Referring to FIG. 9 , FIG. 10 , FIG. 11 and FIG. 12 , the lower part of the push rod 2 is provided with a handle 11 , and the handle 11 is provided with a thrust block 12 , and correspondingly the handle 11 is provided with a through hole 13 for mounting the thrust block 12 . The thrust block 12 and the inner wall of the through hole 13 are integrally connected with the handle 11 by two easy break points 14 and an end point 15, and the thrust block 12 is rotated along the end point 15, and the thrust block 12 can resist the bottom of the syringe 1 to prevent The card core 8 is accidentally pushed into the elastic pawl 7 of the coupling hub 4 due to an erroneous operation before transporting and pumping the liquid, so that the syringe is self-destructed in advance. Before pushing the liquid, the external force The thrust block 12 is easily pushed, and the thrust block 12 is rotated along the end point 15 to break the upper frangible point, and the outer side wall of the thrust block 12 is embedded in the hole passage 13. In order to prevent the thrust block in the insertion hole 13 from slipping out, two protruding ribs 16 are provided between the inner wall of the through hole 13 and the two frangible points, and two corresponding protrusions 17 are provided on the thrust block 12. When the outer side wall of the thrust block 12 is inserted into the hole passage 13, the protrusion 17 is also embedded between the rib 16 and the thrust block 12, and the thrust block 12 is fixed in the through hole 13. When the invention is used, firstly, as shown in Fig. 1, when the syringe is not in use, the core 8 does not pass through the elastic pawl 7 of the coupling hub 4, and at the same time, the thrust block 12 for preventing misoperation is pressed against the needle. Jane 1 at the bottom.

 Subsequently, as shown in Fig. 2, this process is a preparation operation before the liquid pushing, and the outer side wall of the thrust block 12 is inserted into the through hole 13. As shown in FIG. 3, when the liquid pushing is completed, the frustum 9 of the card core 8 passes through the elastic pawl 7 so that the elastic pawl 7 abuts against the frustum 9 so as to hinder the card core 8 from moving backward. The card core 8 blocks the inner cavity of the coupling hub 4 and cannot be used again, completing the first step of self-destruction. As shown in Fig. 4, when the self-destruction is completed, the push rod 2 is pulled hard, so that the head of the push rod 2 cannot be broken out in the needle 1 and the replacement push rod 2 and the rubber plug 3 are prevented from being used again. , to achieve complete self-destruction.

Claims

1. An improved self-destructing syringe comprising a hollow needle (1), a push rod (2) sliding in the needle (1), and a rubber plug (3) mounted on the front end of the push rod (2) The front end of the needle (1) is gradually reduced in diameter and formed with a coupling socket (4), and the coupling needle seat (4) is connected with a needle holder (6) equipped with an injection needle (5), and the front end of the push rod (2) A card core (8) is provided, and the card core (8) can block the inner cavity of the coupling needle seat (4), and is characterized by:  A: the inner wall of the coupling hub (4) is formed with an elastic pawl (7) gathered toward the center; B: the card core (8) is formed with a frustum that can be engaged with the elastic pawl (7) (9).  2. An improved self-destructing syringe according to claim 1, characterized in that: the elastic pawl (7) is located in the middle of the coupling hub (4), and correspondingly the frustum (9) is located in the card core The middle part of (8).  3. An improved self-destructing syringe according to claim 1 or 2, characterized in that the length of the card core (8) is less than or equal to the length of the coupling hub (4).  4. An improved self-destructing syringe according to claim 1 or 2, wherein: said elastic pawl (7) is injection molded integrally with the inner wall of the coupling hub (4).  5. An improved self-destructing syringe according to claim 1 or 2, characterized in that: said push rod (2) is provided with a plurality of frangible points.  6. An improved self-destructing syringe according to claim 1 or 2, wherein: said coupling hub (4) is threaded or centered.  7. An improved self-destructing syringe according to claim 1 or 2, characterized in that the number of elastic pawls (7) of the head of the coupling hub (4) is at least two. 8. An improved self-destructing syringe according to claim 1 or 2, characterized in that: the lower part of the push rod (2) is provided with a handle (11), and the handle (11) is provided with a thrust block (12), Correspondingly, the handle (11) is provided with a through hole (13) for mounting the thrust block (12), and the inner wall of the thrust block (12) and the through hole (13) is provided with two break points (14) and an end point (15). ) is integrated with the handle (11), and the thrust block (12) is rotated along the end point (15).  9. An improved self-destructing syringe according to claim 8, wherein: a rib (16) is formed between the inner wall of the through hole (13) and the two frangible points (14), and the thrust is There are two corresponding protrusions (17) on the block (12).