WO2013127257A1 - Plunger structure for use in retractable-type safe self-destructing syringe - Google Patents

Description

 Core rod structure for pull-back safe self-destructing syringe

 [0001] The present invention relates to the technical field of medical devices, and more particularly to a core rod structure for a pull-back safety self-destructing syringe, and more particularly to a mechanical connection structure thereof.

Background technique

[0002] Comparative Document 1, Patent No.: ZL200710047077.4, Application Date: 2007.10.16, Announcement No.: CN101411908, Patentee: Shanghai Dingjiantang Biochemical Technology Co., Ltd., this case discloses "a safe self-destructive vaccine syringe"", comprising a cylinder, 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 core rod end portion 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 is sleeved The cavity is hollow, the lower needle seat is formed into a cylindrical structure, and the lower needle seat is provided with a lower needle seat rib relative to the inner wall of the opening of the other end of the mounting needle seat, and the end of the core rod is formed by the lateral notch and the longitudinal notch communicating. The elastic body, wherein 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, and the lateral gap can be The outer cymbal is low-shaped, 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 convex ring is larger than the outer wall diameter of the upper needle seat by 0.05 mm - 0.3 mm, the lower needle seat is cylindrical, the inner cavity is hollow, and the inner wall of the lower needle seat cavity is provided with a lower needle seat annular fixing groove The annular fixing groove of the lower needle seat can cooperate with the fixing convex ring of the upper needle seat, and the inner diameter of the upper cavity of the annular fixing groove of the lower needle seat is smaller than the outer diameter of the outer wall of the upper rod of the upper needle fixing convex ring by 0.1 mm - 0.35 mm, The inner diameter of the lower cavity of the annular fixed groove of the needle seat 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 annular rib of the lower needle seat at the end of the outer wall of the lower end of the lower needle seat convex ring. The inner wall of the cylinder neck of the cylinder body is respectively provided with a cylinder neck upper limit ring and a cylinder neck lower limit ring, and the distance between the cylinder neck upper limit ring and the cylinder neck lower limit ring is 0.3 mm - 1.5 mm, and the cylinder neck upper limit ring Projecting from the inner wall of the upper limit ring of the neck and the lower limit ring of the neck to the inner wall 0.1mm - 0.6mm, the neck The limit ring protrudes from the inner wall of the upper end ring of the cylinder neck and the lower limit ring of the cylinder neck to 0.02 mm - 0.25 mm, and the inner wall of the upper cylinder of the upper cylinder of the upper end of the cylinder neck is between the upper limit ring of the inner cylinder and the lower limit ring of the neck The inner diameter of the inner cavity of the cylinder, the inner diameter of the inner cylinder of the cylinder neck and the lower limit of the cylinder neck, the inner diameter of the inner cylinder of the cylinder, the inner diameter of the lower cylinder of the lower cylinder, the upper cylinder of the cylinder neck and the lower limit of the cylinder neck The inner diameter of the inner cavity is smaller than the outer diameter of the annular rib of the lower needle seat 0.1mm-0.5mm, and the inner cavity of the cylinder is opposite to the inner cylinder The inner wall of the other end of the neck is provided with a cylinder limiting rib, and the cylindrical limiting rib can be a linear annular rib, a circular rib composed of a plurality of vertical ribs, a vertical rib, and a plurality of convex ribs formed by a plurality of convex points. The inner wall of the cylinder at the lower part of the rib is provided with a convex rib in the cylinder, 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 that of the annular limiting piece. diameter.

 [0003] Comparative Document 2, Patent No.: ZL200720067715.4, Application Date: 2007.03.08, Announcement No.: CN201076648, Patentee: Shanghai Dingjiantang Biochemical Technology Co., Ltd., This case discloses "a metal hook structure" The core rod includes a core rod body, the upper end portion of the core rod body is provided with a columnar fastener, and the columnar fastener is sleeved with a rubber plug, wherein the rubber plug is provided with a mounting hole, and the mounting hole is provided with a pouring Hook body.

[0004] In the existing safety syringe structure, the function of retracting the needle by using the barb body is realized, and the safety injection is realized, and the general barb body is a metal piece or a plastic part. 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 and product quality of the metal parts themselves and their assembly process. Uncertainty in terms of hidden dangers. Existing plastic barbs still have defects or imperfections in structure and thus cause 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, causing the user to be damaged twice.

 [0005] In summary, there is still a need to further improve the core structure of the existing barb pull-back injector to further improve the safety and stability of the product during use, while simplifying the processing process and reducing manufacturing. The purpose of the cost.

Summary of the invention

 [0006] It is an object of the present invention to provide a core rod structure for a pull-back safety self-destructing syringe, the rod body end is provided with an elastic locking function, and the locking member can be connected with the syringe needle seat. The cavity is locked to each other by the snapping manner, and after the needle holder is pulled back into the syringe barrel, under the action of the asymmetric elastic structure, the needle seat will be deflected to one side by force, and the injection needle will be nearly forty-five. The angle direction is reversed to the side of the inner wall of the cylinder, and is locked by the neck of the cylinder, thereby preventing the injection needle and the needle seat from being pushed out again to the neck of the cylinder, effectively preventing the secondary damage caused by the needle being pushed out, and realizing the safety of the syringe. The self-destruct operation overcomes the shortcomings and deficiencies in the prior art.

[0007] In order to achieve the above object, the technical solution of the present invention is: a core rod structure for a pull-back safety self-destructing syringe, which comprises a rod body, and a rubber plug limit assembly portion is formed near the end portion of the rod body, Plug limit A rubber plug is sleeved at the seat assembly portion, and the rod body end is provided with an asymmetric elastic locking pullback member.

 The present invention discloses a core rod structure for a pull-back safety self-destructing syringe, the end of which is provided with an asymmetric pull-back locking member with an elastic function. The asymmetric structure is combined with the elastic function design to ensure that the locking member can be smoothly inserted into the inner cavity of the needle seat, and the elastic expansion force is utilized to realize the locking and locking of the asymmetrical engaging portions on both sides and the inner wall engaging portion of the needle seat. When the needle holder is pulled back into the syringe barrel, under the force of the asymmetric force, the needle seat will automatically deflect to one side, and the needle will fall 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 injection needle and the needle seat to be unable to be pushed out again to the neck of the cylinder, effectively preventing the secondary damage caused by the needle being pushed out, and realizing the safe self-destruct operation of the syringe. In the specific implementation of the present invention, the asymmetric elastic pull-back locking member is a plastic barb body, and the plastic barb body adopts a design principle of asymmetry and an inelastic structure, and is designed with a specific angle and size. The barb body has an elastic buffer locking function. In addition, the asymmetric elastic pull-back locking member is integrated with the core rod, and the integral component is formed by one-time opening molding, which does not require separate processing or subsequent assembly, thereby effectively reducing manufacturing cost and simplifying The assembly process 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 clever, and it is easy to promote and apply. Compared with the existing products. In terms of design and technology, the design has significant technical breakthroughs and outstanding safety and practical features. DRAWINGS

 [00091] FIG. 1 is a schematic structural view of the present invention.

 2 is a schematic view showing the structure of a plastic barb body according to the present invention.

 3 is a top view of FIG. 2.

 4 is a side view of FIG. 2.

 [0013] FIG. 5 is a diagram showing the state of use of the present invention.

detailed description

 [0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] The present invention is a core rod structure for a pull-back type self-destructing syringe, which comprises a rod body 1 , and a rod stopper 1 is formed near the end portion of the rod body 1 , and the rubber plug limit fitting portion 2 A rubber plug 16 is sleeved, which is different from the prior art in that an end of the rod body 1 is provided with an asymmetric elastic locking pullback member. The asymmetric elastic locking pullback member has a center line of symmetry of the core rod, wherein each of the two sides of the shaft forms an engaging locking portion, and the engaging locking portions on both sides are asymmetric. At the same time, the locking portion on one or both sides has elasticity The structure ensures that the locking pullback member can smoothly enter the inner cavity of the needle and is tightly locked and locked.

 [0016] In a specific implementation, the one side engagement locking portion is higher or lower than the other side engagement locking portion. The width of the one side engagement locking portion is larger or smaller than the other side engagement locking portion, whereby the engagement locking portions on both sides are asymmetrically distributed.

 [0017] In a specific implementation, the distance between the outer edge of the engaging locking portion of the one side and the symmetrical center line of the rod body is from 1 mm to 20 mm.

 [0018] In the specific embodiment of the present invention, the asymmetric elastic locking pullback member is a barb body 3, and the barb body 3 is made of plastic material, and is integrated with the rod body 1 to form an open mold. The uniform performance of the material improves the overall stability of the mandrel, and the one-piece construction reduces manufacturing costs and increases production and assembly efficiency.

[0019] In another embodiment of the present invention, the asymmetric elastic locking pullback member is a barb body 3, and the barb body 3 is made of a plastic material and is assembled with the shaft body 1 .

[0020] In a specific implementation, the lower end of the barb body forms a base portion 4, and the upper portion of the base portion 4 forms a first folding arm 5 that is deflected to one side, and the connection between the first folding arm 5 and the base portion 4 The outer side wall forms a concave arcuate angle 8 or a chamfer angle of 45 degrees to 179 degrees, and the lower end of the first folding arm 5 is connected to the upper end of the base portion 4, and the upper end of the first folding arm 5 The second folding arm 6 is connected to the other end, and the other end of the second folding arm 6 is suspended. The outer side of the junction of the first folding arm 5 and the second folding arm 6 forms an arc surface 7, the first folding arm 5 and the second folding arm. 6 The inner side of the joint forms an inner angle 11 of 2 degrees and 90 degrees, and the width of the opening between the suspended end of the second folding arm 6 and the first folding arm 5 is 0.5 mm - 40 mm, which ensures the first fold The elastic stretching property is formed between the arm and the second folding arm, and the barb body slides into the inner cavity of the needle seat by the elastic change of the angle between the first folding arm and the second folding arm, and is under the action of the resetting force Closely locked with the inner cavity of the needle seat. The length of the first folding arm 5 is 0.5 mm - 50 mm, and the length of the second folding arm 6 is 0.5 mm - 60 mm. The hanging end of the second folding arm 6 forms a thorn tip 15, and the hanging end of the second folding arm 6 protrudes from the outer side edge of the base portion 4.

 [0021] In a specific implementation, four ribs 12 are formed at the rod body 1 at an angle of a cross shape, and a limiting flap 13 is disposed at an outer edge of the rib 12 . The limit flaps 13 and the ribs 12 are connected by at least two contacts 14.

[0022] The above is a further detailed description of the present invention in conjunction with the specific preferred embodiments. For those skilled in the art to which the present invention pertains, it is also possible to make a simple deduction or replacement without departing from the inventive concept. Change, should be considered as belonging to the scope of protection of the present invention <

Claims

Claim 1. A core rod structure for a pull-back safety self-destructing syringe, comprising a rod body (1), a rod body (1) forming a rubber plug limit fitting portion (2) near the end portion, a rubber plug limit assembly A rubber plug (16) is sleeved at the portion (2), and the end portion of the rod body (1) is provided with an asymmetric elastic locking pullback member.  2. The core structure for a pull-back safety self-destructing syringe according to claim 1, wherein: the asymmetric elastic locking pullback member has a center line of a symmetry center line of the core rod, One of the two sides of the shaft forms an engaging locking portion, and the engaging locking portions on both sides are asymmetric.  3. The core rod structure for a pull-back safety self-destructing syringe according to claim 2, wherein: the one side engagement locking portion is higher or lower than the other side engagement locking portion .  4. A core structure for a pull-back safety self-destructing syringe according to claim 2, wherein: the width of the side engagement locking portion is greater or smaller than the other side engagement locking portion.  A core structure for a pull-back type self-destructing syringe according to claim 2, wherein: the one or both of the engagement locking portions have an elastic structure.  6. The core structure for a pull-back safety self-destructing syringe according to claim 2, wherein: between the outer edge of the engaging locking portion of the one side and the symmetrical center line of the shaft The distance is lmm-20mm.  The core structure for a pull-back safety self-destructing syringe according to claim 1, wherein: the asymmetric elastic locking pullback member is a barb body (3), The barb body (3) is made of plastic material, and the barb body (3) is integrated with the rod body (1), and is formed by one-time opening molding, or the barb body G) and the rod body (1) component assembly structure, The lower end of the barb body forms a base portion (4). 8. The core structure for a pull-back safety self-destructing syringe according to claim 7, wherein: the upper portion of the base portion (4) forms a first folding arm that is deflected toward one side ( 5), the outer side wall of the joint between the first folding arm (5) and the base portion (4) forms a concave arc angle (8) or a chamfer angle of 45 degrees to 179 degrees, The lower end of the folding arm (5) is connected to the upper end of the base portion (4). The upper end of the first folding arm (5) is connected to the end of the second folding arm (6), and the other end of the second folding arm (6) is suspended. ' The outer side of the junction of the first folding arm (5) and the second folding arm (6) forms a circular arc surface ( ⁷ ), and the inner side of the junction of the first folding arm (5) and the second folding arm (6) forms 2 degrees. The inner angle (11) of 90 degrees, the width of the opening formed between the suspended end of the second folding arm (6) and the first folding arm (5) is 0.5 mm - 40 mm, and the first folding arm (5) having a length of 0.5 mm to 50 mm, a length of the second folding arm (6) being 0.5 mm to 60 mm, and a hanging end of the second folding arm (6) forming a tip (15), the The free end of the bi-folding arm (6) protrudes from the outer edge of the base portion (4).  9 . The core structure for a pull-back safety self-destructing syringe according to claim 1 , wherein the rod body ( 1 ) forms four ribs with a cross-shaped angular distribution. 12), the rib (12) is provided with a limit flap at the outer edge. The limit flap ( ) and the rib U2) are connected by at least two contacts (14).