WO2013127038A1

WO2013127038A1 - Needle base structure for use in safe self-destructing syringe

Info

Publication number: WO2013127038A1
Application number: PCT/CN2012/000930
Authority: WO
Inventors: 王祖扬
Original assignee: Wang Zuyang
Priority date: 2012-02-29
Filing date: 2012-07-05
Publication date: 2013-09-06
Also published as: WO2013127261A1; CN202569092U

Abstract

A needle base for use in a safe self-destructing syringe, comprising a needle base body. The lower end of the needle base body is connected to an outer sleeve-type retracting-locking component (5); the upper end is fitted with a needle (1); while formed in proximity to the middle part is a flexible sealing stopper part (2). An annular cushioning gap (3) is provided on the surface of the flexible sealing stopper part (2). The outer wall of the flexible sealing stopper part (2) outside the annular cushioning gap (3) forms an annular sealing stopper engaging part (4). The outer sleeve-type retracting-locking component (5) is interlocked with an asymmetric retracting-locking piece arranged on an end part of a syringe plunger. When the needle base is retracted into a barrel body of the syringe, in a stress environment of an asymmetric force, the needle base will be forced to deflect to a side of the inner wall of the barrel body. When the injection needle is retracted completely into the barrel body, the needle is locked by the barrel body, thus preventing the injection needle and the needle base from being pushed out of the barrel body again.

Description

Needle seat structure for safe self-destructing syringe

The present invention relates to the technical field of medical devices, and more particularly to a needle holder structure for a safe self-destructing syringe, and more particularly to a mechanical connection structure thereof.

Background technique

Comparative Document 1, Patent No.: ZL200710047077. 4, Application Date: 2007. 10. 16, Announcement No.: CN101411908, Patentee: Shanghai Top Tang Biochemical Technology Co., Ltd., this case discloses "a safe self-destructive vaccine syringe" The utility model comprises a cylinder body, a core rod is arranged in the cylinder body, a rubber plug is arranged near the end of the core rod, a needle is arranged in the cylinder neck of the cylinder body, and a needle tube is arranged at the needle head, wherein: the end of the core rod is The side wall of the rod body is provided with a lateral notch, the transverse notch is connected with the longitudinal notch at the end of the mandrel rod, the transverse notch is matched with the longitudinal notch, and the needle is sleeved by the upper needle seat and the lower needle seat, and the lower needle seat cavity is formed. Hollow, the lower needle seat has a cylindrical structure, and the lower needle seat is provided with a lower needle seat rib relative to the inner wall of the opening at the other end of the needle seat, and the end of the core rod is provided with elasticity formed by the transverse notch and the longitudinal notch. Body, where the core rod body has a certain elasticity, wherein the longitudinal notch is narrow and wide, and the outer wall of the upper core rod of the lateral notch protrudes from the outer wall of the lower core rod, the transverse gap The outer end of the core rod is in the shape of a circular arc, the upper needle seat is formed in a cylindrical shape, the upper part of the outer wall of the upper needle seat is provided with a reinforcing wing piece, and the lower part of the outer wall of the upper needle seat is provided with a fixed convex ring of the upper needle seat, The outer diameter of the needle fixing collar is greater than the diameter of the outer wall of the upper needle seat 0. 05mm-0. 3mm, the lower needle seat is cylindrical, the inner cavity is hollow, and the inner wall of the lower needle cavity is provided with a lower needle seat ring. The fixing groove, the lower needle seat annular fixing groove can cooperate with the upper needle fixing convex ring, the lower needle The inner diameter of the upper cavity of the annular fixed groove of the head seat is smaller than the outer diameter of the outer wall of the upper rod of the upper needle fixing collar 0. 1mm - 0. 35mm, the inner diameter of the lower cavity of the lower needle seat annular fixing groove is lower than the fixed seat of the needle seat The outer diameter of the outer wall of the rod, the lower needle seat is provided with a lower needle ring annular rib at the end of the outer wall of the other end of the lower needle seat convex ring, and the inner wall of the cylinder neck is respectively provided with a cylinder neck upper limit ring and a cylinder The lower limit ring of the neck, the distance between the upper end ring of the cylinder neck and the lower limit ring of the cylinder neck is 0. 3mm - 1. 5mm, and the upper limit ring of the cylinder neck protrudes between the upper limit ring of the cylinder neck and the lower limit ring of the cylinder neck The inner wall is 0. lmm - 0. 6mm, the lower limit of the neck is protruded from the inner wall of the upper end ring of the cylinder neck and the lower limit ring of the cylinder neck 0. 02mm - 0. 25ram, the inner diameter of the inner cavity of the upper cylinder of the upper limit of the cylinder neck The inner diameter of the inner cavity of the cylinder between the upper limit ring of the cylinder neck and the lower limit ring of the cylinder neck, the inner diameter of the inner cylinder of the inner cylinder of the cylinder upper limit ring and the lower limit ring of the cylinder neck, the inner diameter of the inner cylinder of the lower cylinder of the cylinder The inner diameter of the inner cavity of the cylinder between the upper limit ring of the neck and the lower limit ring of the neck is smaller than the outer diameter of the annular rib of the lower needle seat. 1 wake up 0. 5 painting, the inner cavity of the cylinder is provided with a cylinder limiting rib at the inner wall of the other end of the cylinder neck, and the cylinder limiting rib may be a linear annular rib, a circular rib composed of a plurality of vertical ribs, and a strip. An annular rib composed of a vertical rib and a plurality of raised points, and a cylindrical rib at the lower portion of the cylinder at the lower portion of the cylinder limiting rib, a distance between the limiting rib of the cylinder and the rib in the cylinder, and the thickness of the annular limiting piece The inner diameter of the cylinder limiting rib is smaller than the diameter of the annular limiting piece.

In the existing safety syringe structure, the function of retracting the needle by the barb body is realized, and the safe injection is realized. Generally, the barb body is a metal piece or a plastic piece. Metal parts need to be processed and matched or assembled with the core rod. The manufacturing process is complicated, difficult and not stable, which not only increases the processing procedure and manufacturing cost, but also increases the safety and product quality of the metal parts themselves and their assembly process. Uncertainty in terms of hidden dangers. Existing plastic barbs still exist in structure In the case of defects or imperfections, there are security risks or security holes in the use of the product. The existing plastic inverted fastener design can realize the needle pullback function, but in use, the needle is still in a normal trajectory after being pulled back, and the needle may be pushed out again to cause the user to be damaged twice.

In addition, the existing single-needle seat back-pull safety self-destructing syringe or safety syringe has the same problem, that is, how to solve the stability of the inner needle seat and the cylinder and achieve a certain strength to meet the stability requirements; At the same time, the required pulling force when retracting the needle holder should not be too large for convenient use. Although the rigid mating structure can achieve a stable locking effect on the inner needle seat and the inner wall of the cylinder, it is difficult or even impossible to achieve the convenience of use at the same time. The inherent instability of the plastic material and its susceptibility to changes in ambient temperature can result in poor stability of the product of the hard-fit structure, and the quality and precision of the production process are difficult to control, making it almost impossible to achieve mass production.

In summary, there is still a need to further improve the core structure of the existing pullback syringe and the locking structure between the inner needle seat and the cylinder to further improve the safety and stability of the product during use. The purpose of simplifying the processing process and reducing the manufacturing cost is achieved. Summary of the invention

It is an object of the present invention to provide a hub structure for a safe self-destructing syringe. The syringe needle seat and the syringe barrel are mutually locked by an elastic buffer mechanism, and the expansion force is generated by the deformation of the buffer gap to achieve the locking and disengaging effect of the two. The elastic buffer mechanism can be disposed at the inner needle seat, or can be disposed on the inner needle seat. At the inner wall of the cylinder, at the same time, the needle seat and the cylinder body form an elastic buffering engagement mechanism which can cooperate with each other, and the end of the core rod is provided with an asymmetric locking member with elastic function, and the locking member can be connected with the needle holder of the syringe The cavity is interlocked by the snapping method And, when the needle holder is pulled back into the syringe barrel, under the force of the asymmetric elastic structure, the needle seat will be deflected to one side by force, and the injection needle will therefore be inverted toward the cylinder in the direction of nearly forty-five degrees. The side of the inner wall is locked by the neck of the cylinder, thereby causing the injection needle and the needle holder to be unable to be pushed out again to the neck of the cylinder, thereby effectively preventing the secondary damage caused by the needle being pushed out again, thereby realizing the safe self-destruct operation of the syringe. The shortcomings and deficiencies existing in the prior art are overcome.

In order to achieve the above object, a first technical solution of the present invention is: a needle seat structure for a safety self-destructing syringe, comprising a needle base body, wherein: the lower end of the needle seat body and the outer casing type pull-back lock The upper end of the needle holder body is equipped with a needle tube, and an elastic sealing limit portion is formed near the middle portion of the needle holder body, and an annular buffer gap is opened on the surface of the elastic sealing limit portion, and an elastic sealing limit portion outside the annular buffer gap is opened. The outer wall forms an annular seal limit engagement portion.

The invention discloses a needle seat structure for a safe self-destructing syringe, and an end of the syringe core rod matched with the same is provided with an asymmetric pull-back locking member with elastic function; the asymmetric structure is matched with the elastic function design, It is ensured that the locking member can be smoothly inserted into the inner cavity of the needle seat, and the function of elastic expansion is used to realize the locking and locking of the engaging portion of the outer casing of the needle-shaped back-locking component of the inner cavity of the needle seat. Since the annular groove design of the inner cavity of the outer casing pull-back locking assembly also has elastic cushioning characteristics, when the asymmetrical pull-back locking member is in a propulsion state, both of them will have a relative cushioning deformation, which facilitates the locking member to be engaged in the outer casing type. Pulling back the inner cavity of the locking assembly; locking the interlocking locking assembly with the outer casing when the locking member is retracted. When the needle holder is pulled back into the syringe barrel, under the force of the asymmetric force, the needle seat will be deflected to one side, and the needle will be affected. This is to the side of the inner wall of the cylinder in the direction of nearly forty-five degrees; when the needle is completely returned to the cylinder, the needle is locked by the neck of the cylinder, thereby causing the needle and the needle holder to be unable to be pushed out again. , effectively prevent the needle from being pushed out again to cause secondary damage, and truly realize the safe self-destruct operation of the syringe. In an embodiment of the invention, the asymmetric elastic pull-back locking member is a plastic barb. The plastic barb body adopts the design principle of asymmetry and elastomer structure, and the specific angle and size design make the barb body have elastic buffer locking function. The above asymmetric elastic pull-back locking member is integrated with the core rod, and the integral component is formed by one-time open molding, which does not require separate processing or subsequent assembly, which effectively reduces the manufacturing cost, simplifies the assembly process, and reduces the assembly process. The asymmetric elastic pull-back piece at the end of the core rod has excellent engagement and locking effect on the inner cavity of the needle seat, and the overall structure of the product is reasonable, the design is clever, the operation is simple, the working state is stable, and the utility model is easy to popularize and apply. Compared with the existing product design and technology, the design has significant technical breakthroughs, and has outstanding safety and practical features.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention.

2 is a schematic structural view of a jacket type pull-back locking assembly of the present invention.

Figure 3 is a diagram showing the state of use of the present invention.

detailed description

The invention will now be further described with reference to the accompanying drawings.

The present invention is a needle holder structure for a safe self-destructing syringe, which comprises a needle holder body, which is different from the prior art in that the lower end of the needle holder body is connected to a jacket type pull-back locking assembly 5, the needle The upper end of the seat body is equipped with a needle tube 1 , and the needle seat body is near the middle shape The elastic sealing limit portion 2 is provided with an annular buffer gap 3 on the surface of the elastic sealing limit portion 2, and the outer wall of the elastic sealing limit portion 1 on the outer side of the annular buffer gap 3 forms an annular sealing limit engaging portion 4, which is elastically sealed. The limiting portion enables the stable engagement between the inner needle body and the cylinder, and the effect of light withdrawal is achieved.

In a specific implementation, the annular buffer gap 3 is an annular groove structure, the height of the slot to the bottom of the groove is 0.05 mm - 4 mm, the width of the annular buffer gap 3 is 0.05 mm - 4 mm, and the outer side of the annular buffer gap 3 The distance between the groove wall and the arc-shaped top of the surface of the annular seal limiting engagement portion 4 is 0.1 mm-6 mm, and the groove between the outer groove wall of the annular buffer gap 3 and the outer wall of the annular seal limiting engagement portion 4 The distance between the bottom of the outer groove wall of the annular buffer gap 3 and the outer wall of the annular seal limiting engagement portion 4 is 0.1 mm-6 mm, and the surface of the annular seal limit engagement portion 4 is 0.1 mm-6 mm. The arc-shaped surface, the distance from the surface arc top of the annular seal limiting engaging portion 4 to the edge of the curved surface is smaller than the distance from the top of the arc to the lower edge of the curved surface, and the elastic seal of the lower portion of the annular sealing limit engaging portion 4 An annular recess 6 is formed at the outer wall of the limiting portion 2.

In a specific implementation, the annular recess 6 is located at the same level as the groove bottom of the annular buffer gap 3 or above the groove bottom of the annular buffer gap 3.

In a specific implementation, at least one annular limiting rib 7 is formed on the outer wall of the lower end of the needle seat body, and an annular ring corresponding to the annular limiting rib 7 is disposed at the inner wall of the inner cavity of the upper end of the outer casing pull-back locking component 5 Bit slot 8.

In a specific implementation, the inner casing of the outer casing pull-back locking assembly 5 is hollow, and the inner wall of the inner cavity forms an annular engagement locking portion 9 near the lower end opening.

In an embodiment, the upper portion of the annular locking locking portion 9 forms an annular groove 10, and the inner side wall 11 of the annular groove 10 has a thickness of 0.01 mm to 3 mm, and the inner side wall of the annular groove 10 An angle of 2 to 90 degrees is formed between the outer side wall 12 of the annular groove 10, and an inner diameter formed at the upper end of the inner side wall of the annular groove 10 is 1 mm to 80 mm.

In a specific implementation, the annular groove 10 has a notch width greater than a groove width. The above is a further detailed description of the present invention in conjunction with the specific preferred embodiments. It will be apparent to those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the invention.

Claims

Claim

A needle holder structure for a safety self-destructing syringe, comprising a needle holder body, wherein: a lower end of the needle holder body is coupled to an outer sleeve type pull-back locking assembly (5), and the upper end of the needle holder body A needle tube (1) is assembled, and an elastic sealing limit portion (2) is formed near the middle portion of the needle seat body, and an annular buffer gap (3) is opened on the surface of the elastic sealing limit portion (2), and the outer side of the annular buffer gap (3) The outer wall of the elastic sealing limit portion (2) forms an annular seal limit engagement portion (4).

2 . The needle seat structure for a safe self-destructing syringe according to claim 1 , wherein: the annular buffer gap ( 3 ) is an annular groove structure, and the height of the groove to the bottom of the groove is 0.05mm-35mm, the width of the annular buffer gap (3) is 0.05mm-30mm, the annular buffer gap (3), the outer groove wall and the annular seal limit engagement part

(4) The distance between the top of the surface arc surface is 0.1mm-20mm, and the distance between the outer groove wall of the annular buffer gap (3) and the outer wall of the annular seal limit engagement part (4) is 0.1mm- 20mm, annular buffer gap (3) The distance between the bottom of the outer groove wall groove and the outer wall of the annular seal limit engagement part (4) is 0.1mm-20mm, the annular seal limit engagement part

The surface of (4) is curved, and the distance from the surface of the annular sealing limit engaging portion (4) to the edge of the curved surface is smaller than the distance from the top of the arc to the lower edge of the curved surface, and the annular sealing limit card Joint

(4) The lower elastic seal limiter (2) forms an annular recess (6) at the outer wall.

The needle seat structure for a safe self-destructing syringe according to claim 2, wherein: the annular recess (6) is at the same level as the groove bottom of the annular buffer gap (3) or The bottom of the groove is higher than the annular buffer gap (3).

4. A needle seat for a safe self-destructing syringe according to claim 1 The structure is characterized in that: at least one annular limiting rib is formed at the outer wall of the lower end of the needle seat body

(7), Jack-type pull-back locking assembly (5) The inner wall of the upper end cavity is provided with an annular limiting groove (8) that cooperates with the annular limiting rib (7).

The needle seat structure for a safe self-destructing syringe according to claim 1, wherein: the outer casing pull-back locking assembly (5) has a hollow inner cavity, and an inner wall of the inner cavity is adjacent to the lower end opening. A ring-shaped engagement locking portion (9) is formed.

6. A needle seat structure for a self-destructing syringe according to claim 5, wherein the upper portion of the annular snap locking portion (9) forms an annular groove (10), annular concave The inner side wall (11) of the groove (10) has a thickness of 0.01 mm to 3 mm, and the inner side wall of the annular groove (10) forms an angle of 2 to 90 degrees with the outer side wall (12) of the annular groove (10). The inner diameter formed at the upper end of the inner side wall of the groove (10) is 1 mm to 80 mm.

7. A hub structure for a self-destructing syringe according to claim 6, wherein: the annular groove (10) has a notch width greater than a groove width.