WO2013127261A1 - Needle base structure for use in safe self-destructing syringe - Google Patents

Description

 Needle seat structure for safe self-destructing syringe

 (0001) 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

[0002] Comparative document 1, patent number: ZL200710047077.4, application date: 2007.10.16, announcement number: CN101411908, patentee: Shanghai Dingtangtang 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 opposite to the installation]: the inner wall of the opening of the other end of the needle holder is provided with a lower needle seat rib, and the end of the core rod is formed by the lateral notch and the longitudinal gap communicating. Elastomer, 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, and the lateral gap can be The inner end of the outer 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 larger than the outer 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 lower needle seat inner wall is provided with a lower needle seat annular fixing concave 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 fixing ring of the upper needle seat by 0.1 mm - 0.35 mm, The outer 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 of the convex ring, and the lower needle seat is provided with the annular needle rib of the lower needle seat at the end of the outer wall of the other 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. The ring protrudes from the inner wall of the upper end ring of the cylinder neck and the lower limit ring of the cylinder neck by 0.1 mm - 0.6 mm. The lower limit ring is protruded from the inner wall of the upper neck ring of the simple neck and the lower limit ring of the cylinder neck by 0.02 mm to 0.25 mm, and the inner wall of the upper cylinder of the upper cylinder of the upper neck of the cylinder neck is between the upper limit ring of the cylinder neck and the lower limit ring of the neck of the cylinder The inner diameter of the inner cavity of the cylinder, the inner diameter of the inner cavity of the cylinder between the upper limit ring of the simple neck and the lower limit ring of the cylinder neck, the inner diameter of the inner cylinder of the lower cylinder of the lower limit of the cylinder neck, the upper limit ring of the cylinder neck and the lower limit ring of the neck The inner diameter of the inner cavity of the cylinder is smaller than the outer diameter of the annular rib of the lower needle seat 0. 1 mm - 0.5 mm, the inner cavity of the cylinder is opposite to the 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] In the existing safety syringe structure, the function of retracting the needle by using the barb body is realized, and safety 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 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, 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.

 [0004] 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. Sexual 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.

 [0005] 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. Sex, at the same time to achieve the purpose of simplifying the processing process and reducing manufacturing costs.

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 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 cavities are locked to each other by snapping, and, after the needle holder is pulled back into the syringe body, the asymmetric elastic structure 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.

 [0007] In order to achieve the above object, the first technical solution of the present invention is: a needle holder structure for a safe self-destructing syringe, which comprises a needle holder body, wherein the lower end of the needle holder body is The outer sleeve of the needle holder body is connected with a needle tube, and the needle holder body forms an elastic sealing limit portion near the middle portion, and the surface of the elastic sealing limit portion is provided with an annular buffer gap, and the outer side of the annular buffer gap The outer wall of the elastic sealing limit portion forms an annular seal limit engagement portion.

 [0008] The present invention discloses a needle seat structure for a safety self-destructing syringe, and an end of a syringe core rod matched therewith is provided with an asymmetric pull-back locking member with an elastic function; an asymmetrical structure with an elastic function The design ensures that the locking member can be smoothly inserted into the inner cavity of the needle seat, and utilizes the function of elastic expansion to realize the card locking and locking of the sleeve-type pull-back locking component engaging portion of the inner side of the needle holder inner cavity. Since the annular groove design of the inner cavity of the outer casing pull-back locking assembly also has elastic cushioning characteristics, when the asymmetric pull-back locking member touches the advancing state, both of them will have relative buffer deformation, which facilitates the locking member to be inserted into the outer casing. 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 inverted toward the inner wall of the cylinder in the direction of nearly forty-five degrees. Side; When the needle is completely returned to the barrel, the needle will be locked by the neck of the barrel, which will prevent the needle and the needle holder from being pushed out of the tube again, effectively preventing the needle from being pushed out again, causing secondary damage, realizing the syringe. Safe self-destruct operation. In the specific implementation 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 part 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 breakthrough, and has outstanding safety and practical features.

DRAWINGS 1 is a schematic structural view of the present invention.

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

[0011] FIG. 3 is a diagram showing the state of use of the present invention.

detailed description

 [0012] The present invention will be further described below with reference to the accompanying drawings.

 [0013] The present invention is a needle seat structure for a safety self-destructing syringe, which includes a needle hub body, which is different from the prior art in that the lower end of the needle hub body is connected to the outer casing pull-back locking assembly 5, The upper end of the needle hub body is equipped with a needle tube 1 , 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 arranged on the surface of the elastic sealing limit portion 2, and an elastic seal outside the annular buffer gap 3 is provided. The outer wall of the limiting portion 2 forms an annular sealing limit engaging portion 4, and the elastic sealing limiting portion enables the stable engagement between the inner needle body and the cylinder, and the effect of lightly withdrawing.

[0014] 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 0.05mm-4mm, and the width of the annular buffer gap 3 is 0.05mm-4mm, ring buffer The distance between the outer groove wall of the gap 3 and the arc top of the surface of the annular seal limit engagement portion 4 is 0.1 mm-6 mm, and the outer groove wall groove of the annular buffer gap 3 and the outer wall of the annular seal limit engagement portion 4 The distance between the gaps is 0.1 mm-6 mm, the distance between the bottom of the outer groove wall of the annular buffer gap 3 and the outer wall of the annular seal limit engagement portion 4 is 0.1 mm-6 _{m m} , and the annular sealing limit is engaged. The surface of the portion 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. The annular sealing limit engaging portion 4 An annular recess 6 is formed at the outer wall of the lower elastic seal limiting portion 2.

 [0015] In a specific implementation, the annular recess 6 is located on the same horizontal surface as the groove bottom of the annular buffer gap 3 or higher than the groove bottom of the annular buffer gap 3.

 [0016] 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 the inner wall of the inner cavity of the upper end of the outer casing pull-back locking component 5 is matched with the annular limiting rib 7 The annular limit groove 8.

 [0017] In a specific implementation, the inner casing of the outer casing pull-back locking assembly 5 is hollow, and an inner wall of the inner cavity forms an annular engagement locking portion 9 near the lower end opening.

[0018] In a specific implementation, 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 and the annular groove 10 an angle of 2 to 90 degrees is formed between the outer side walls 12, and an inner diameter formed at the upper end of the inner wall of the annular groove 10 is Lmm-80mm.

 [0019] In a specific implementation, the notch width of the annular groove 10 is greater than the groove width.

[0020] 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: the lower end of the needle holder body is connected with a jacket type pull-back locking assembly (5), and the upper end of the needle holder body The needle tube (1) is assembled, and the elastic sealing limit portion (2) is formed near the middle portion of the needle seat body, and the annular buffer gap (3) is opened on the surface of the elastic sealing limit portion (2), and the annular buffer gap (3) is outside. 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 from the notch to the bottom of the groove is 0.05 _m m-35mm, the width of the annular buffer gap (3) is 0.05mm-30mm, the annular buffer gap (3) The distance between the outer groove wall and the arc-shaped top of the annular seal limit engagement part (4) 0.1mm-20mm, annular buffer gap (3) The distance between the outer groove wall slot and the outer wall of the annular seal limit engagement part (4) is 0.1mm-20mra, outside the annular buffer gap (3) The distance between the bottom of the groove wall groove and the outer wall of the annular seal limit engagement portion (4) is Ol _mm -20 mm, and the surface of the annular seal limit engagement portion (4) is curved. The distance between the surface of the annular seal and the edge of the curved surface is less than the distance from the top of the arc to the lower edge of the curved surface, and the elastic sealing limit of the lower part of the annular sealing limit engaging portion (4) An annular recess (6) is formed at the outer wall of the seat portion (2).  3. 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 Above the groove bottom of the annular buffer gap (3).  The needle seat structure for a safety self-destructing syringe according to claim 1, wherein: at least one annular limiting rib (7) is formed at an outer wall of the lower end of the needle seat body, and the outer casing is back. Pulling lock assembly (5) The inner wall of the upper end inner cavity is provided with an annular limiting groove (8) which cooperates with the annular limiting rib (7).  5. The needle hub structure for a safe self-destructing syringe according to claim 1, wherein: the outer casing of the outer casing pullback clamping assembly (5) is hollow, and the inner wall of the inner cavity is close to the lower end. A ring-shaped engagement locking portion (9) is formed at the mouth. 6. A needle seat structure for a safe self-destructing syringe according to claim 5, characterized in that - the upper portion of the annular snap locking portion (9) forms an annular groove (10), an annular recess The inner wall (11) of the groove (10) has a thickness of 0.01 mm to 3 nm, 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 U0) is Lmm-80mm.  7. A needle 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.