WO2015070523A1

WO2015070523A1 - Pulled-back fixed-needle safe self-destroying syringe

Info

Publication number: WO2015070523A1
Application number: PCT/CN2014/001010
Authority: WO
Inventors: 王祖扬
Original assignee: 王祖扬
Priority date: 2013-10-18
Filing date: 2014-11-13
Publication date: 2015-05-21
Also published as: CN203634589U

Abstract

Disclosed is a pulled-back fixed-needle safe self-destroying syringe, comprising a cylinder (1) provided with a core rod (2) inside, wherein a position close to the upper end portion of the core rod (2) is sleeved with a rubber plug (3); the cylinder neck of the upper end portion of the cylinder (1) is provided inside with an elastic cushioning upper needle base (4) located at the upper part and a lower needle base (5) located at the lower part, both being integrally connected to form a whole in a sleeve-clamp manner; the upper part of the elastic cushioning upper needle base (4) forms a needle tube-assembling column (6) and the lower part of the elastic cushioning upper needle base (4) is cylindrical; an annular elastic sealing limiting ring body (7) is formed at the outer wall of the lower part of the elastic cushioning upper needle base (4); and an annular elastic cushioning gap (8) is formed between the inner wall of the elastic sealing limiting ring body (7) and the outer part of the lower part of the elastic cushioning upper needle base. As a whole, the syringe is rational in structure, simple in operation, stable in working conditions, and has the characteristics of safety and practicality.

Description

Pull-back fixed needle safety self-destructing syringe

Technical field

The utility model relates to the technical field of medical instruments, in particular to a pull-back fixed needle safety self-destructing syringe, in particular to a mechanical connection structure thereof.

Background technique

Comparative document, patent number: ZL201210049628.1, application date: 2012.02.29, applicant: Wang Zuyang, this case discloses "a needle pull-back type safe self-destructing syringe", including a cylinder, the end of the cylinder barrel The needle body is provided in the neck, the core body is provided in the cylinder body, and the rubber rod is disposed near the end of the core rod, wherein the upper part of the needle seat body is placed in the neck of the cylinder, and the middle part of the needle seat body forms an elastic sealing limit The lower part of the needle seat body is connected with the outer casing type pull-back locking component, and the surface of the elastic sealing limit portion is provided with an annular buffer gap, and the outer wall of the elastic sealing limit portion outside the annular buffer gap forms an annular sealing limit engagement. The end of the core rod is provided with an asymmetric elastic locking pullback member.

In the existing safety syringe structure, the function of retracting the needle by using 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 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.

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 of 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 instability of the plastic material itself and the characteristics that are subject to changes in the ambient temperature result in poor stability of the product of the hard-fit structure, and the quality and precision in the production process are difficult to control, and mass production is almost impossible.

Furthermore, although the improved syringe structure in the comparative document can basically achieve the stability requirement between the barrel and the barrel, a sealing ring should be assembled between the inner needle holder and the syringe barrel to achieve the sealing function, and the sealing rubber ring is provided. The method and position directly affect the sealing effect of the syringe and the residual amount of the liquid during the injection. The existing inner needle sealant ring is displaced during transportation and use, and the residual amount of the liquid is not ideal.

In summary, there is still a need for a locking structure and a sealant ring between the existing pull-back syringe hub and the barrel. The structure is further improved to further improve the safety and stability of the product during use, reduce the residual amount of the liquid, and at the same time achieve the purpose of simplifying the processing process and reducing the manufacturing cost.

Summary of the invention

The purpose of the utility model is to provide a pull-back fixed needle safety self-destructing syringe, which can be locked with the syringe barrel by an elastic buffering engagement mechanism. The cushioning clearance of the engaging portion and the plasticity of the engaging member are skillfully utilized to perfectly achieve the locking and disengaging effects of the two. The elastic buffering engagement mechanism can be disposed at the upper and lower needle seats of the double needle seat, or can be disposed at the inner wall of the cylinder, and the shape, size, thickness and position of the elastic body can be changed according to the overall design of the product; In this way, as long as the corresponding elastic cushioning mechanism is formed at the inner needle seat or the inner wall of the cylinder at the same time. The end of the plunger of the syringe is provided with an elastic locking function, and the locking member can be locked with the inner cavity of the lower needle seat of the double needle seat of the syringe. 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; the injection needle will therefore fall toward the inner wall of the cylinder in the direction of nearly forty-five degrees. One side; when the injection needle is completely returned to the barrel, the needle will be locked by the neck of the barrel, thereby causing the injection needle and the needle holder to be unable to be pushed out of the cylinder again, effectively preventing the secondary damage caused by the needle being pushed out again, realizing the syringe The safety self-destruction operation, at the same time, the sealing rubber ring assembly part is formed between the upper and lower needle seats, so that the sealing assembly structure is more stable, and the indented rubber ring assembly structure can effectively prevent leakage and further reduce the residual amount of the liquid medicine, thereby overcoming the present There are shortcomings and deficiencies in the technology.

In order to achieve the above object, the technical solution of the present invention is: a pull-back fixed needle safety self-destructing syringe, which comprises a cylinder body, a core rod is arranged in the cylinder body, and a rubber plug is sleeved near the upper end portion of the core rod, and the cylinder is sleeved The upper end of the body of the body is provided with an elastic buffer upper needle seat at the upper portion and a lower needle seat at the lower portion, and the two are integrally connected by a sleeve snap-fit manner, wherein the upper portion of the elastic buffer upper needle seat is formed. The needle tube assembly column has a cylindrical shape on the lower part of the elastic buffer upper sleeve, and an annular elastic sealing limit ring body is formed at the lower outer wall of the elastic buffer upper needle seat. The inner wall of the elastic sealing limit ring and the outer wall of the lower part of the elastic buffer upper needle seat are formed. Forming an annular elastic buffer gap, the lower part of the elastic sealing limit ring body forms a connecting portion with the lower outer wall of the elastic buffer upper needle seat, and the elastic buffer upper needle seat of the lower part of the connecting portion forms an annular reverse step, and the elastic sealing limit ring body is close to An annular elastic sealing limit portion is formed at an outer portion of the upper edge, and the surface of the annular elastic sealing limiting portion has an arc-shaped bulging shape, and an elastic sealing limit below the annular elastic sealing limiting portion An annular engaging recess is formed at the outer wall of the ring, the lower needle seat is also cylindrical, and a lower limit ring is formed at a lower portion of the lower needle seat near the outer edge, and the annular ring forms a ring shape with the outer wall of the lower needle seat. a gap, the lower end of the elastic buffer upper needle seat is located in the annular gap, and the annular sealing ring assembly portion is formed between the reverse step and the upper end of the limit insert ring, and the sealing rubber ring is located in the annular sealing rubber ring assembly portion, The inner cavity of the needle seat is hollow, and an annular locking ring is formed at an inner wall of the hollow inner cavity. The upper surface of the annular locking ring forms an annular locking groove, and the lower surface of the annular locking ring forms an annular guiding inclined surface, and the inclined surface and the horizontal plane of the annular guiding inclined surface Forming an angle of 5 degrees to 85 degrees, and the upper end of the core rod is asymmetric Pulling the locking member, the maximum width of the asymmetric pull-back locking member is greater than the inner diameter of the annular locking ring, and the inner diameter of the annular locking ring is 1 mm to 15 mm, and the inner wall of the annular locking ring is elastic under the action of the annular locking groove.

The utility model discloses a pull-back fixed needle safety self-destructing syringe. A split assembly structure or a single injection molding is formed between the upper needle seat and the lower needle seat, and a sealing rubber ring assembly portion is formed at an outer wall between the upper and lower needle seats. The sealing assembly structure is more stable, and the indented rubber ring assembly structure can effectively prevent leakage and further reduce the residual amount of the liquid medicine. The end of the syringe core rod used with the needle seat is provided with an asymmetric pullback with elastic function. The locking member; the asymmetric structure and the elastic function design ensure that the locking member can be smoothly inserted into the inner cavity of the elastic buffer under the elastic buffer, and the elastic expansion function is used to realize the card locking of the barb member and the elastic buffer lower needle seat. . Since the annular lock groove design also has elastic cushioning characteristics, when it is contacted with the asymmetric pull-back lock member (barb member) in the advancing state, both will produce relative cushioning deformation, facilitating the asymmetric pull-back lock member (barb member) ) snapped into the lock groove of the annular locking ring; when the locking member is pulled back, the locking groove of the annular locking ring is locked with each other. When the needle head is pulled back into the syringe barrel, under the force of the asymmetric force, the whole needle head 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. One side; when the needle is completely returned to the barrel, the needle will be locked by the neck of the barrel, thereby causing the needle and the needle holder to be unable to be 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 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 elastomer structure, and the specific angle and size design make the barb body have an 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, and no separate processing or subsequent assembly is required, 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 concept 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 a significant technical breakthrough, 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 elastic buffer upper needle seat of the present invention.

Figure 3 is a schematic view showing the structure of the lower needle seat of the present invention.

Figure 4 is an assembly view of the upper and lower needle holders of the present invention.

detailed description

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

The utility model relates to a pull-back fixed needle safety self-destructing syringe. As shown in FIG. 1 , it comprises a cylinder 1 , and a core rod 2 is arranged in the cylinder body. The rubber rod 3 is sleeved near the upper end portion, and the upper end of the cylinder body 1 is located at the upper portion. The elastic buffer upper needle holder 4 and the lower lower needle holder 5 are integrally connected by a sleeve-fitting manner, which is different from the prior art in that the upper portion of the elastic buffer upper needle holder 4 forms a needle tube assembly column 6, The lower part of the elastic buffer upper needle seat 4 has a cylindrical shape, and an elastic elastic sealing limit ring body 7 is formed at the lower outer wall of the elastic buffer upper needle seat 4, and the inner wall of the elastic sealing limit ring body 7 and the lower outer wall of the elastic buffer upper needle seat 4 are formed. An annular elastic buffer gap 8 is formed therebetween, and a lower portion of the elastic sealing ring body 7 forms a connecting portion 9 with a lower outer wall of the elastic buffer upper needle seat 4, and an elastic buffer upper needle seat 4 at the lower portion of the connecting portion 9 forms an annular reverse step 10 The elastic sealing ring body 7 forms an annular elastic sealing limiting portion 11 near the outer edge of the upper edge. The surface of the annular elastic sealing limiting portion 11 has an arc-shaped bulging shape, and the annular elastic sealing portion 11 is below the limiting portion 11 An annular engagement recess 12 is formed at the outer wall of the elastic sealing ring body 7. The lower needle base 5 is also cylindrical. The lower portion of the lower needle base 5 forms a limit insert 13 near the outer edge. The limit insert 13 Forming an annular gap 14 with the outer wall of the lower hub 5 The lower end of the elastic buffer upper needle holder 4 is located in the annular gap 14, and the annular sealing ring assembly portion 15 is formed between the reverse step 10 and the upper end of the limiting insertion ring 13, and the sealing rubber ring 20 is located in the annular sealing rubber ring. In the fitting portion 15, the inner cavity of the lower needle seat 5 is hollow, and an annular locking ring 16 is formed at the inner wall of the hollow inner cavity. The upper surface of the annular locking ring 16 forms an annular locking groove 17, and the lower surface of the annular locking ring 16 forms a ring. a guiding inclined surface 18, the inclined surface of the annular guiding inclined surface 18 forms an angle of 5 degrees - 85 degrees with the horizontal plane, and the annular guiding obliquely faces the asymmetric pull-back locking member (barb component) of the end of the core rod to guide At the same time, the barb component is guided to deform when sliding into the inner cavity of the needle seat. At the same time, when the needle seat is pulled into the cavity of the needle body, deflection occurs to one side, and the annular guiding slope 18 can leave space for deflection. The upper end of the rod 2 is provided with an asymmetric pull-back locking member 19, the maximum width of the asymmetric pull-back locking member 19 is larger than the inner diameter of the annular locking ring 16, and the inner diameter of the annular locking ring 16 is 1 mm-15 mm, and the annular locking ring ( The inner wall of 16) is elastic under the action of the annular lock groove 17.

In a specific implementation, the asymmetric pull back locking member 19 is a plastic barb or a metal barb. The barb body can cooperate with the annular lock groove on the upper surface of the annular locking ring, and the hook end of the barb body is locked in the annular lock groove. The cross-section of the annular lock groove is approximately triangular, which facilitates the locking of the barb.

In a specific implementation, the lower inner cavity of the elastic buffer upper needle seat 4 is hollow, and an annular inner concave ring 21 is formed at the inner wall of the hollow inner cavity. The outer wall of the lower hub 5 forms an annular engagement collar 22 that engages with the annular engagement inner recessed ring 21.

In a specific implementation, the annular elastic buffer gap 8 has a gap width of 0.3 mm to 6.8 mm and a depth of 1 mm to 8.6 mm. The thickness of the elastic sealing ring body 7 can be set according to different specifications of the syringe, and the range is 0.06mm-8mm, adjusting the thickness of the elastic sealing ring body 7 can be used to adjust the strength of the elastic body.

In a specific implementation, the height difference between the highest point of the annular elastic seal limiting portion 11 and the lowest point of the annular engagement recess portion 12 is 0.1 mm to 8 mm. Adjust the drop to adjust the elastic force.

In a specific implementation, the elastic buffer upper needle base 4 and the lower needle base 5 are in a split assembly structure or a single injection molding structure.

In a specific implementation, the inner wall of the cylinder neck of the cylinder 1 is provided with an annular seal limiting card slot 23 that cooperates with the annular elastic seal limiting portion 11.

In a specific implementation, the outer diameter of the sealing rubber ring 20 is larger than the inner diameter of the cylinder neck of the cylinder 1 by 0.05 mm to 0.9 mm, which can achieve an optimal sealing effect between the two.

In an implementation, the elastic buffering and engaging mechanism formed by the elastic sealing ring can be disposed at the upper and lower needles of the double needle seat, or at the inner wall of the cylinder, and the shape, size and thickness of the elastic body and The position can be changed according to the overall design of the product; however, in any way, it is only necessary to form corresponding elastic cavities and engaging mechanisms at the inner needle seat or the inner wall of the cylinder. The elastic sealing ring can be realized in various forms, not only a closed ring body, such as a ring body that is broken several places or a ring body composed of a plurality of elastic engaging portions, as long as it passes through the elastic part The structure of connecting the hub and the barrel by elastic snapping should be considered as belonging to the protection scope of the present invention.

The above is a further detailed description of the present invention in conjunction with the specific preferred embodiments, and it is not intended that the specific embodiments of the present invention are limited to the above description. For those skilled in the art to which the present invention pertains, a number of simple deductions or substitutions may be made without departing from the spirit and scope of the invention.

Claims

The pull-back fixed needle safety self-destructing syringe comprises a cylinder body (1), and a core rod (2) is arranged in the cylinder body. The rubber rod is sleeved with a rubber plug (3) near the upper end portion, and the upper end portion of the cylinder body (1) The inner neck of the cylinder is provided with an elastic buffer upper needle seat (4) at the upper portion and a lower needle seat (5) at the lower portion, which are integrally connected by a sleeve snap-fit manner, characterized in that: the elastic buffer upper needle The upper part of the seat (4) forms a needle assembly column (6), and the lower part of the elastic buffer upper needle seat (4) has a cylindrical shape, and an elastic elastic sealing limit ring body (7) is formed at the lower outer wall of the elastic buffer upper needle seat (4). An annular elastic buffering gap (8) is formed between the inner wall of the elastic sealing ring body (7) and the lower outer wall of the elastic buffer upper needle seat (4), and the lower part of the elastic sealing ring body (7) and the elastic buffer upper needle seat ( 4) The lower outer wall forms a connecting portion (9), the elastic buffer upper needle seat (4) at the lower portion of the connecting portion (9) forms an annular reverse step (10), and the elastic sealing ring body (7) is close to the upper edge An annular elastic sealing limit portion (11) is formed on the outer portion, and the surface of the annular elastic sealing limiting portion (11) has an arc-shaped bulging shape, and the elastic sealing under the annular elastic sealing limiting portion (11) An annular engaging recess (12) is formed at the outer wall of the sealing ring body (7), the lower needle seat (5) is also cylindrical, and a lower limit ring is formed at a lower portion of the lower needle seat (5) near the outer edge ( 13) an annular gap (14) is formed between the limiting collar (13) and the outer wall of the lower needle seat (5), and the lower end of the elastic buffer upper needle seat (4) is located in the annular gap (14). An annular sealing rubber ring fitting portion (15) is formed between the step (10) and the upper end of the limiting ring (13), and the sealing rubber ring (20) is located in the annular sealing rubber ring fitting portion (15), the lower needle The inner cavity of the seat (5) is hollow, and an annular locking ring (16) is formed at the inner wall of the hollow inner cavity. The upper surface of the annular locking ring (16) forms an annular locking groove (17), and the lower annular locking ring (16) The surface forms an annular guiding bevel (18), the inclined surface of the annular guiding bevel (18) forms an angle of 5 degrees -85 degrees with the horizontal plane, and the upper end of the core rod (2) is provided with an asymmetric pull-back locking member (19) The maximum width of the asymmetric pull-back locking member (19) is greater than the inner diameter of the annular locking ring (16), the inner diameter of the annular locking ring (16) is 1 mm-15 mm, and the inner wall of the annular locking ring (16) is in the ring lock The groove (17) is elastic under the action of the groove.
The pull-back fixed-needle safety self-destructing syringe according to claim 1, wherein the asymmetric pull-back locking member (19) is a plastic barb or a metal barb.
The pull-back fixed needle safety self-destructing syringe according to claim 1, wherein the lower inner cavity of the elastic buffer upper needle seat (4) is hollow, and an annular inner concave ring is formed at the inner wall of the hollow inner cavity. (twenty one).
The pull-back fixed needle safety self-destructing syringe according to claim 1, wherein the outer wall of the lower needle seat (5) forms an annular engagement collar (22) that cooperates with the annular engagement inner concave ring (21). ).
The pull-back type fixed-needle safety self-destructing syringe according to claim 1, wherein the annular lock groove (17) has a substantially triangular cross section.
The pull-back fixed needle safety self-destructing syringe according to claim 1, wherein the annular elastic buffer gap (8) has a gap width of 0.3 mm to 6.8 mm, a depth of 1 mm to 8.6 mm, and an elastic sealing limit. The ring body (7) has a thickness of 0.06 mm to 8 mm.
The pull-back type fixed-needle safety self-destructing syringe according to claim 1, characterized in that: between the highest point of the annular elastic seal limiting portion (11) and the lowest point of the annular engagement recess portion (12) The height of the drop is 0.1mm-8mm.
The pull-back fixed needle safety self-destructing syringe according to claim 1, wherein the elastic buffer upper needle seat (4) and the lower needle seat (5) are in a split assembly structure or a single injection molding structure. .
The pull-back fixed needle safety self-destructing syringe according to claim 1, characterized in that: the inner wall of the cylinder neck of the cylinder body (1) is provided with an annular seal matched with the annular elastic sealing limit portion (11). Limit card slot (23).
The pull-back fixed needle safety self-destructing syringe according to claim 1, characterized in that the outer diameter of the sealing rubber ring (20) is larger than the inner diameter of the neck of the cylinder (1) by 0.05 mm to 0.9 mm.