WO2013127039A1

WO2013127039A1 - Replaceable-needle inner needle base structure for use in safe self-destructing syringe

Info

Publication number: WO2013127039A1
Application number: PCT/CN2012/000931
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: CN202777315U; WO2013127260A1

Abstract

A replaceable-needle inner needle base for use in a safe self-destructing syringe, comprising a needle base body. The needle base body has arranged therein an inner sleeve-type retracting-locking component (7). The upper part of the needle base body forms a replaceable-needle fitting part (1). The lower part of the needle base body forms a flexible sealing stopper part (2). The replaceable-needle fitting part (1) and the flexible sealing stopper part (2) are either a single-body integrated structure or a split-body assembled structure. 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) that is capable of forming a flexible cushioned engagement with the inner wall of a barrel body. An engaging-locking part (14) matching a plunger retracting piece is arranged in a cavity of the inner sleeve-type retracting-locking component (7). When the engaging-locking part (14) and the plunger retracting piece are matched with each other, both retract the plunger, thereby retracting into the barrel body the needle base and deflecting same to a side, while an injection needle therefore swings towards a side of the inner wall of the barrel body and is locked by a neck part of the barrel body. This prevents the injection needle and the needle base from being pushed out of the neck part of the barrel body again, thus effectively preventing secondary injury caused by the needle being pushed out again.

Description

Replaceable needle inner needle seat structure for safe self-destructing syringe

The present invention relates to the technical field of medical devices, and more particularly to a replaceable needle inner needle seat 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 is protruded from the outer wall of the lower core rod, and the lateral gap can be The outer part is low in inner shape, the end of the core rod is formed in an arc shape, 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 needle ring of the upper needle seat, the upper needle The outer diameter of the 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 1毫米— The outer diameter of the outer cavity of the lower needle seat is fixed to be smaller than the outer diameter of the outer wall of the upper needle fixing ring 0. 1mm— 0. 35mm, the inner diameter of the lower cavity of the lower needle seat annular fixing groove is fixed on the outer diameter of the outer wall of the lower rod of the convex ring, and the lower needle seat is provided with the lower needle seat at the outer end of the outer end of the lower needle seat convex ring 5毫米至 1. The distance between the upper end of the cylinder neck and the lower limit of the cylinder neck is 0. 3mm - 1. 5mm, the upper end of the cylinder 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. 0mm - 0. 6, the lower limit ring of the cylinder protrudes from the upper limit ring of the cylinder neck and the lower limit of the neck The inner wall of the ring is 0. 02mm - 0. 25mm, the inner diameter of the inner cylinder of the upper cylinder of the upper end of the cylinder is the inner diameter of the inner cylinder of the inner cylinder neck and the lower limit of the cylinder neck, the upper limit of the cylinder neck and the cylinder The inner diameter of the inner cavity of the cylinder between the lower limit ring of the neck is the inner diameter of the inner cylinder of the lower cylinder of the lower ring of the cylinder, on the neck of the cylinder The inner diameter of the inner cavity of the cylinder between the bit ring and the lower limit ring of the cylinder is smaller than the outer diameter of the annular rib of the lower needle seat 0. lmm - 0. 5mm, the inner cavity of the cylinder is provided with a cylinder limit at the inner wall of the other end of the cylinder neck The rib, the cylinder limit rib may be a linear annular rib, an annular rib composed of a plurality of vertical ribs, a vertical rib, and a plurality of raised points, and a cylindrical body is provided at the inner wall of the cylinder at the lower portion of the cylinder limiting rib. The rib, the distance between the limiting rib of the cylinder and the rib in the cylinder is the thickness of the annular limiting piece, and the inner diameter of the limiting rib of the cylinder 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 steps and manufacturing costs, but also increases the safety of the metal parts themselves and their assembly process. Uncertainty in terms of sexuality and product quality. Existing plastic barbs still have defects or imperfections in structure, which leads to safety hazards or safety 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 replaceable needle inner needle holder structure for a safe self-destructing syringe. The syringe needle can be locked between the needle seat and the syringe barrel 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. It can also be disposed at the inner wall of the cylinder, and at the same time, the inner needle seat and the cylinder body form an elastic buffering and engaging mechanism which can cooperate with each other, and the core thereof The rod end is provided with an elastic locking function, the locking member can be interlocked with the inner cavity of the syringe needle seat, and after the needle seat is pulled back into the syringe barrel, the asymmetric elastic structure is Under the action of the force, the needle seat will be deflected to one side, and the needle will be inverted to the side of the inner wall of the cylinder in the direction of nearly forty-five degrees, and locked by the neck of the cylinder, thereby causing the needle and the needle seat. The cylinder neck cannot be pushed out again, effectively preventing the secondary damage caused by the needle being pushed out again, realizing the safe self-destruct operation of the syringe, and overcoming the shortcomings and deficiencies in the prior art.

In order to achieve the above object, a first technical solution of the present invention is: a replaceable needle inner needle seat structure for a safe self-destructing syringe, comprising a needle base body, wherein: the needle seat body cavity is hollow The hollow inner cavity is provided with an inner sleeve type pull-back locking assembly, and the upper part of the needle seat body forms a replaceable needle fitting portion, and the lower part of the needle seat body forms an elastic sealing limit portion, the needle-changeable assembly portion and the elastic seal The limiting portion is formed into a single unit structure, and an annular buffer gap is formed on the surface of the elastic sealing limit portion, and an outer wall of the elastic sealing limit portion of the annular buffer gap forms an annular sealing limit engaging portion, and the elastic sealing limit portion An anti-side rib is provided at the outer wall.

In order to achieve the above object, a second technical solution of the present invention is: a replaceable needle inner needle seat structure for a safe self-destructing syringe, comprising a needle base body, wherein: the needle seat body cavity is hollow The hollow inner cavity is provided with an inner sleeve type pull-back locking assembly, and the upper part of the needle seat body forms a replaceable needle fitting portion, and the lower part of the needle seat body forms an elastic sealing limit portion, the needle-changeable assembly portion and the elastic seal The component of the limiting portion is assembled, the annular sealing gap is formed on the surface of the elastic sealing limit portion, and the outer wall of the elastic sealing limit portion outside the annular buffering gap forms an annular sealing limit engaging portion, and the outer wall of the elastic sealing limit portion Anti-swing Reinforcing ribs.

The invention discloses a replaceable needle inner needle seat structure for a safety 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; an asymmetric structure with elastic function The design ensures that the locking member can be smoothly inserted into the inner cavity of the needle seat, and the elastic expansion force is used to realize the card locking and locking of the inner sleeve type pull-back locking component of the inner cavity of the needle seat inner cavity. Since the annular groove of the inner cavity type pull-back locking component card cavity also has elastic buffering property, the asymmetric pull-back locking component touches in the advancing state, and the two will relatively generate buffer deformation, so that the locking component can be inserted into the inner sleeve type. Pulling back the inner cavity of the locking assembly and locking the inner sleeve type pull-back locking assembly when the locking member is retracted. When the needle holder is pulled back into the syringe barrel, the needle seat is under the force of asymmetric force. A deflection will be formed to one side, and the injection needle will thus fall to the side of the inner wall of the cylinder in the direction of nearly forty-five degrees, and will be locked by the neck of the cylinder, thereby causing the injection needle and the needle holder to be unable to be pushed out again. Effective in preventing secondary damage caused by the needle being pushed again, the real safety syringes self-destruct operation. In an embodiment of the invention, the asymmetric elastic pull-back locking member is a plastic barb. The plastic barb body adopts a design principle of asymmetry and an inelastic structure, and uses a specific angle and size design to make the barb body have an elastic buffer locking function. In addition, the above asymmetric elastic pull-back locking member and the core rod Integral structure, the whole part is molded in one opening, no separate processing or subsequent assembly is required, which effectively reduces the manufacturing cost, simplifies the assembly process and reduces the assembly process. The product is easy to operate and has stable working condition. The asymmetric elastic pull-back piece at the end of the core rod and the inner cavity of the needle seat have excellent locking and locking effect. The overall structure of the product is reasonable, the concept is ingenious, and it 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 view showing the structure of the body of the hub of the present invention.

3 is a schematic structural view of an inner sleeve type pull-back locking assembly of the present invention.

Figure 4 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 invention relates to a replaceable needle inner needle seat structure for a safe self-destructing syringe, which comprises a needle seat body, which is different from the prior art in that: the needle seat body cavity is hollow, and the hollow inner cavity is An inner sleeve type pull-back locking assembly 7 is provided. The upper part of the needle seat body forms a replaceable needle fitting portion 1. The lower portion of the needle seat body forms an elastic sealing limit portion 2, the needle-changeable mounting portion 1 and the elastic sealing limit portion. 2 integral one-piece structure, the surface of the elastic sealing limit portion 2 is provided with an annular buffer gap 3, and the outer wall of the elastic sealing limit portion 2 outside the annular buffer gap 3 forms an annular sealing limit engaging portion 4, elastic sealing The anti-side rib 5 is provided at the outer wall of the limiting portion 2. The elastic sealing limit portion can achieve the requirement of stable engagement between the needle seat body and the cylinder body, and can realize the effect of lightly withdrawing.

Another technical solution of the present invention is a replaceable needle inner needle seat structure for a safe self-destructing syringe, which comprises a needle base body, which is different from the prior art in that: the needle seat body cavity is hollow, An inner sleeve type pull-back locking assembly 7 is disposed in the hollow inner cavity, and the upper part of the needle seat body forms a replaceable needle fitting portion 1, and a lower portion of the needle seat body forms an elastic sealing limit portion 2, The needle-retaining part 1 and the elastic sealing part 2 are assembled in a body, and the annular sealing gap 3 is formed on the surface of the elastic sealing limit portion 2, and the outer wall of the elastic sealing limit portion 2 on the outer side of the annular buffering gap 3 is formed into a ring shape. The sealing limit engaging portion 4 is provided with an anti-side rotation rib 5 at the outer wall of the elastic sealing limiting portion 2.

In a specific implementation, the outer helical fitting portion 6 is formed at the interchangeable needle fitting portion 1. In the specific implementation, the upper portion of the interchangeable needle fitting portion 1 has a truncated cone shape with a taper of 6:100, and the outer peripheral wall of the replaceable needle fitting portion 1 forms the outer spiral fitting portion 6.

In a specific implementation, the end portion of the anti-side rib 5 has a semi-circular shape or a tapered shape. In a specific implementation, an excessive distance between the interchangeable needle fitting portion 1 and the elastic seal limiting portion 2 forms an annular step 8 or an annular slope.

In a specific implementation, the annular buffer gap 3 is an annular groove structure, the height of the groove 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 9 is formed at the outer wall of the limiting portion 2.

In a specific implementation, the annular recess 9 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, the outer wall of the elastic sealing limit portion 2 of the lower portion of the annular step 8 is An annular sealing ring fitting groove 10 is formed, and a ring-shaped sealing rubber ring 11 is sleeved in the annular sealing ring fitting groove 10.

In a specific implementation, at least one inner needle ring annular limiting groove 12 is formed in the inner wall of the needle body cavity, and the inner sleeve type pull-back locking component 7 is provided in the needle body body cavity, and the inner sleeve type pull-back locking component 7 At least one limiting collar 13 matching the inner needle ring annular limiting groove 12 is disposed at the outer wall.

In a specific implementation, the inner sleeve type pull-back locking assembly 7 has a hollow inner cavity, and an inner wall of the inner cavity forms an annular engagement locking portion 14 near the lower end opening.

In an embodiment, the upper portion of the annular locking locking portion 14 forms an annular groove 15 , and the inner side wall 16 of the annular groove 15 has a thickness of 0.01 mm - 3 mm, and the inner side wall of the annular groove 15 and the outer side wall of the annular groove 15 17 forms an angle of 2 to 90 degrees, and an inner diameter formed at an upper end of the inner side wall of the annular groove 15 is 1 mm to 80 mm.

In a specific implementation, the annular groove 15 has a notch width greater than a groove low 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 replaceable needle inner needle base structure for a safe self-destructing syringe, comprising a needle base body, wherein: the needle base body is hollow, and the hollow inner cavity is provided with an inner sleeve type Pulling back the locking assembly (7), the upper part of the needle seat body forms a replaceable needle fitting portion (1), the lower part of the needle seat body forms an elastic sealing limit portion (2), the needle changing assembly portion (1) and the elastic seal The limiting portion (2) is an integral single structure, and the elastic sealing limit portion (2) is provided with an annular buffer gap (3) on the surface thereof, and an elastic sealing limit portion on the outer side of the annular buffer gap (3)

(2) The outer wall forms an annular seal limit engagement portion (4), and the outer edge of the elastic seal limit portion (2) is provided with an anti-side rotation rib (5).

2. A replaceable needle inner needle seat structure for a safe self-destructing syringe, comprising a needle base body, wherein: the needle base body is hollow, and the hollow inner cavity is provided with an inner sleeve type Pulling back the locking assembly (7), the upper part of the needle seat body forms a replaceable needle fitting portion (1), the lower part of the needle seat body forms an elastic sealing limit portion (2), the needle changing assembly portion (1) and the elastic seal Limiting part (2) component assembly structure, elastic sealing limit (2) surface with annular buffer gap (3), annular buffer gap (3) outer elastic sealing limit (2) outer wall forming ring Sealing limit engagement part (4), anti-side rotation rib (5) is provided on the outer wall of the elastic sealing limit part (2).

The interchangeable needle inner needle seat structure for a safe self-destructing syringe according to claim 1, wherein: the outer needle fitting portion (1) forms an outer spiral fitting portion (6) ).

The interchangeable needle inner needle seat structure for a safe self-destructing syringe according to claim 3, wherein: the upper portion of the replaceable needle fitting portion (1) has a truncated cone shape. Conicity of 6: 100, the lower portion of the outer wall of the interchangeable needle fitting portion (1) forming an outer mounting portion spiral pattern (6) ₀

The interchangeable needle inner needle seat structure for a safe self-destructing syringe according to claim 1, wherein: the end of the anti-side rotation rib (5) has a semi-arc or a cone shape .

6 . The replaceable needle inner needle seat structure for a safety self-destructing syringe according to claim 1 , wherein: the replaceable needle fitting portion ( 1 ) and the elastic sealing limit portion ( 2 ) An excessively formed portion forms an annular step (8) or an annular slope.

7 . The replaceable needle inner 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 slot to the slot The height of the bottom is 0.05mm-4mm, the width of the annular buffer gap (3) is 0.05mm-4mm, 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-6mm, and the distance between the annular buffer gap (3) and the outer wall of the annular seal limit engagement part (4) is 0.1mm-6mm, 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 portion (4) is 0.1mm-6mm, and the annular seal limit is engaged. The surface of the portion (4) is curved, and the distance from the surface of the annular seal to the edge of the arc is less than the distance from the top of the arc to the lower edge of the arc, and the annular seal is limited. An annular recess (9) is formed at the outer wall of the elastic sealing limit portion (2) of the lower portion of the engaging portion (4).

The interchangeable needle inner needle seat structure for a safe self-destructing syringe according to claim 1, characterized in that: the annular recess (9) and the groove bottom of the annular buffer gap (3) The bottom of the groove at the same level or above the annular buffer gap (3).

9 . The replaceable needle inner needle seat structure for a safe self-destructing syringe according to claim 1 , wherein: the outer wall of the elastic sealing limit portion ( 2 ) of the lower part of the annular step ( 8 ) An annular sealing ring fitting groove (10) is formed, and the annular sealing ring fitting groove (10) is sleeved with a "0"-shaped sealing rubber ring (11).

10 . The replaceable needle inner needle seat structure for a safety self-destructing syringe according to claim 1 , wherein at least one inner needle seat annular limiting groove is formed at the inner wall of the needle body body cavity; (12), an inner sleeve type pull-back locking assembly (7) is provided in the body of the needle seat body, and at least one outer wall of the inner sleeve type pull-back locking assembly (7) is matched with the inner needle seat annular limiting groove (12) Limiting collar (13).

The interchangeable needle inner needle seat structure for a safe self-destructing syringe according to claim 1, wherein: the inner sleeve type pull-back locking assembly (7) has a hollow inner cavity and a cavity thereof The inner wall forms an annular engagement locking portion (14) near the lower end opening.

12. The replaceable needle inner needle seat structure for a safety self-destructing syringe according to claim 1, wherein: an upper portion of the annular engagement locking portion (14) forms an annular groove (15) The inner side wall (16) of the annular groove (15) has a thickness of 0.01 mm to 3 mm, and the inner side wall of the annular groove (15) forms an angle of 2 to 90 degrees with the outer side wall (17) of the annular groove (15). The inner diameter formed at the upper end of the inner side wall of the annular groove (15) is from 1 mm to 80 mm.

13. A replaceable needle inner needle holder structure for a self-destructing syringe according to claim 1, wherein: said annular groove (15) has a notch width greater than a groove width.