WO2015070522A1

WO2015070522A1 - Inner needle base structure for pulled-back replaceable-needle safe self-destroying syringe

Info

Publication number: WO2015070522A1
Application number: PCT/CN2014/001009
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: WO2015070524A1; CN203620014U; CN203620013U

Abstract

Disclosed is an inner needle base for a pulled-back replaceable-needle safe self-destroying syringe, comprising a replaceable-needle elastic cushioning upper needle base (1) located at the upper part and a lower needle base (2) located at the lower part, wherein the upper part of the elastic cushioning upper needle base (1) forms a needle base sleeve (3) with a 6:100 taper and the lower part of the elastic cushioning upper needle base (1) is cylindrical; an annular elastic sealing limiting ring body (6) is formed at the outer wall of the lower part of the elastic cushioning upper needle base (1); an annular elastic cushioning gap (8) is formed between the inner wall of the elastic sealing limiting ring body (6) and the outer part of the lower part of the elastic cushioning upper needle base (1); and a connection portion (7) is formed between the lower part of the elastic sealing limiting ring body (6) and the outer wall of the lower part of the elastic cushioning upper needle base (1). The inner needle base for a pulled-back replaceable-needle safe self-destroying syringe is rational in structure, simple in operation, stable in working conditions, and has the characteristics of safety and practicality.

Description

Inner needle seat structure for pull-back type needle-changeable self-destructing syringe

Technical field

The utility model relates to the technical field of medical instruments, in particular to an inner needle seat structure for a pull-back type needle-changeable self-destructing syringe, in particular to a mechanical connecting structure thereof.

Background technique

Contrast document, patent number: ZL201120251348.X, application date: 2011.07.18, announcement number: CN202161645U, patentee: Beyond Depp Medical Technology (Shanghai) Co., Ltd., this case discloses "a kind of safe self-destruction The needle-changing needle inner needle structure of the syringe includes an inner needle seat body, and the lower needle body body has a pull-back locking chamber at a lower end thereof, wherein the inner needle seat body is composed of an upper needle-removable portion and a lower portion The elastic sealing limit portion is formed, and the two are integrated into a single structure. 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 forms an annular sealing limit engaging portion.

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 traditional 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; The required pulling force when returning to 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 inner needle seat structure in the comparative document can basically achieve the stability requirement with the cylinder body, a sealing rubber ring must be assembled between the inner needle seat and the syringe barrel to achieve the sealing function, and the sealing rubber ring can be sealed. The setting method and position directly affect the sealing effect of the syringe and the residual amount of the liquid during injection. The existing inner needle sealant ring will be 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 an inner needle seat structure for a pull-back type needle-changeable self-destructing syringe, and the double needle seat of the syringe 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 or thickness and position of the elastic body can be changed according to the overall structure; 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: an inner needle seat structure for a pull-back type needle-changeable self-destructing syringe, which comprises an interchangeable needle elastic buffer upper needle seat at the upper portion and a lower portion The lower needle seat is integrally connected by a sleeve snapping manner, wherein the needle-retaining elastic buffering upper needle seat forms a 6:100 taper needle seat sleeve, and the needle seat sleeve column forms an inner spiral The sleeve and the needle sleeve are located at the center of the inner spiral sleeve, and the inner wall of the inner spiral sleeve forms an internal thread, and the outer wall of the needle sleeve is elastically buffered to form an elastic sealing limit ring body, and the elastic sealing limit is The ring body and the inner spiral sleeve are oppositely distributed, and the bottom of the elastic sealing ring body forms a connecting portion with the bottom of the inner spiral sleeve, and the inner wall of the elastic sealing ring and the outer wall of the elastic sleeve of the replaceable needle elastic buffer An annular elastic gap is formed, and an annular elastic sealing limit portion is formed at an outer wall of the elastic sealing limit ring body, and the surface of the annular elastic sealing limit portion has an arc-shaped bulging shape. The lower needle seat has a cylindrical shape, and a lower limit hole is formed at a lower portion of the lower needle seat near the outer edge, and an annular gap is formed between the limit insertion ring and the outer wall of the lower needle seat, and the needle can be elastically buffered. In the annular gap, an annular sealing rubber ring fitting portion is formed between the floating end of the annular elastic sealing limit cylinder and the upper end of the limiting insert ring, and the sealing rubber ring is located in the annular sealing rubber ring fitting portion, and the lower needle seat is inside The cavity 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. The lower surface of the annular locking ring forms an annular guiding inclined surface, and the inclined surface of the annular guiding inclined surface forms a horizontal plane. The angle between 5 degrees and 85 degrees, the inner diameter of the annular locking ring is 1mm-15mm, and the inner wall of the annular locking ring acts as a ring lock groove. It has elasticity.

The utility model discloses an inner needle seat structure for a pull-back type needle-changeable self-destructing syringe. The upper needle seat and the lower needle seat are separated assembly structures or one injection molding, between the upper and lower needle holders. The sealing rubber ring assembly portion is formed at the outer wall, 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 chemical liquid, and the end of the syringe core rod used with the needle seat is provided. Asymmetric pull-back lock with elastic function; asymmetrical structure with elastic function design ensures that the lock member can be smoothly inserted into the inner cavity of the elastic buffer under the elastic cushion, and the function of elastic expansion can realize the barb parts and elasticity The card is locked and locked under the buffer. 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 a view showing the state of use 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 an inner needle seat structure for a pull-back type needle-changeable self-destructing syringe. As shown in Fig. 1, it comprises a needle-removable elastic buffer upper needle seat 1 at the upper part and a lower part under the lower part. The needle hub 2 is integrally connected by a sleeve snapping manner, which is different from the prior art in that the needle-changing elastic buffering upper needle hub 1 forms a 6:100 taper. The needle seat sleeve 3, the outer portion of the needle seat post 3 forms an inner spiral sleeve 4, the needle seat post 3 is located at the center of the inner spiral sleeve 4, and the inner wall of the inner spiral sleeve 4 forms an internal thread 5, which can be replaced An elastic sealing limit ring body 6 is formed on the outer wall of the elastic buffer upper needle seat 1. The elastic sealing limit ring body 6 is oppositely distributed with the inner spiral sleeve 4, and the bottom and inner spiral sleeve of the elastic sealing ring body 6 are elastically sealed. The bottom of the cylinder 4 forms a connecting portion 7 , and an annular elastic gap 8 is formed between the inner wall of the elastic sealing ring body 6 and the outer wall of the needle-retaining elastic buffer upper needle seat 1 , and the outer wall of the elastic sealing ring body 6 forms a ring. The elastic sealing limit portion 9 and the surface of the annular elastic sealing stopper 9 have an arc-shaped bulge shape. The lower needle base 2 has a cylindrical shape, and a lower limit insertion ring 10 is formed at a lower portion of the lower needle base 2 near the outer edge. An annular gap 11 is formed between the limit insertion ring 10 and the outer wall of the lower needle base 2, and the needle can be elasticized. The lower end of the buffer upper needle seat 1 is located in the annular gap 11, and the annular sealing ring assembly portion 12 is formed between the floating end of the elastic sealing ring body 6 and the upper end of the limiting ring 10, and the sealing rubber ring 13 is located in the ring. In the sealing rubber ring fitting portion 12, the inner cavity of the lower needle holder 2 is hollow, and an annular locking ring 14 is formed at the inner wall of the hollow inner cavity. The upper surface of the annular locking ring 14 forms an annular locking groove 15, and the annular locking ring 14 The lower surface forms an annular guiding bevel 16, the inclined surface of the annular guiding bevel 16 forms an angle of 5 degrees - 85 degrees with the horizontal plane, the inner diameter of the annular locking ring 14 is 1 mm - 15 mm, and the inner wall of the annular locking ring 14 is annular The lock groove 15 is elastic under the action of the lock groove 15. The annular guide obliquely faces the asymmetric pull-back locking member (barb member) at the end of the core rod, and guides the barb member to deform when sliding into the inner cavity of the needle seat, and at the same time, the needle seat is pulled into the barrel When the body cavity is in the air, it will deflect to one side, and the annular guiding slope can leave space for deflection.

In a specific implementation, the replaceable needle elastically cushions the lower inner cavity of the upper needle seat 1 to be hollow, and the inner wall of the hollow inner cavity forms an annular engagement inner concave ring 17 .

In a specific implementation, the outer wall of the lower needle hub 2 forms an annular engagement collar 18 that cooperates with the annular engagement inner concave ring 17.

In a specific implementation, the annular lock groove 15 has a substantially triangular cross section.

In a specific implementation, 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 ring body 6 having a thickness of 0.06 mm to 8 mm.

In a specific implementation, the outer spiral wall of the inner spiral sleeve 4 is uniformly distributed with a plurality of anti-side ribs 19 at equal intervals, and the upper end portion of the anti-side rib 19 is sharpened.

In a specific implementation, the interchangeable needle elastic buffer has a split assembly structure or a single injection molding structure between the upper needle holder 1 and the lower needle holder 2.

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 Through flexibility The structure of the card joint and the barrel of the snap fit mode 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

An inner needle seat structure for a pull-back type needle-changeable self-destructing syringe, comprising a needle-retaining elastic buffer upper needle seat (1) at an upper portion and a lower needle seat (2) at a lower portion, both of which pass The sleeve snap-fit connection is integrated, and the needle-shaped sleeve (3) of the 6:100 taper is formed on the upper part of the needle-retaining elastic cushion upper needle seat (1), and the needle seat sleeve (3) is formed outside. The inner spiral sleeve (4), the needle seat sleeve (3) is located at the center of the inner spiral sleeve (4), and the inner wall of the inner spiral sleeve (4) forms an internal thread (5), and the needle can be elastically cushioned. An elastic sealing ring body (6) is formed on the outer wall of the seat (1), and the elastic sealing ring body (6) is oppositely distributed with the inner spiral sleeve (4), and the elastic sealing ring body (6) is elastically sealed. The bottom portion forms a connecting portion (7) with the bottom of the inner spiral sleeve (4), and an annular elastic gap is formed between the inner wall of the elastic sealing limiting ring body (6) and the outer wall of the needle-retaining elastic buffer upper needle seat (1). (8) an annular elastic sealing limit portion (9) is formed on the outer wall of the elastic sealing ring body (6), and the surface of the annular elastic sealing limiting portion (9) has an arc-shaped bulging shape, and the lower needle seat (2) Cylindrical, lower needle seat (2) lower part A limiting insertion ring (10) is formed near the outer edge, and an annular gap (11) is formed between the limiting insertion ring (10) and the outer wall of the lower needle seat (2), and the needle can be elastically buffered to the upper needle seat (1) The lower end is located in the annular gap (11), and the annular sealing ring assembly portion (12) and the sealing rubber ring are formed between the floating end of the elastic sealing ring body (6) and the upper end of the limiting ring (10). 13) Located in the annular sealing ring fitting portion (12), the inner cavity of the lower needle seat (2) is hollow, and an annular locking ring (14) is formed at the inner wall of the hollow inner cavity, and the annular locking ring (14) is The surface forms an annular locking groove (15), and the lower surface of the annular locking ring (14) forms an annular guiding inclined surface (16), and the inclined surface of the annular guiding inclined surface (16) forms an angle of 5 degrees -85 degrees with the horizontal plane. The inner diameter of the annular locking ring (14) is 1 mm to 15 mm, and the inner wall of the annular locking ring (14) is elastic under the action of the annular locking groove (15).
The inner needle seat structure for a pull-back type needle-changeable self-destructing syringe according to claim 1, wherein: the replaceable needle elastic buffering upper needle seat (1) has a lower inner cavity, which is hollow A ring-shaped inner concave ring (17) is formed at the inner wall of the hollow inner cavity.
The inner needle seat structure for a pull-back type needle safety self-destructing syringe according to claim 1, wherein the outer wall of the lower needle seat (2) forms a concave ring with the annular ring (17) The mating ring engages the collar (18).
The inner needle seat structure for a pull-back needle-changeable self-destructing syringe according to claim 1, wherein the annular lock groove (15) has a substantially triangular cross section.
The inner needle seat structure for a pull-back type needle-changeable 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; The depth is 1mm-8mm, and the thickness of the elastic sealing ring body 6 is 0.06mm-8mm.
The inner needle seat structure for a pull-back type needle safety self-destructing syringe according to claim 1, characterized in that: the inner spiral sleeve (4) is evenly spaced at an outer wall with a plurality of anti-sides The rib (19) and the upper end portion of the anti-side rib (19) are sharpened.
The inner needle seat structure for a pull-back type needle-changeable self-destructing syringe according to claim 1, wherein the interchangeable needle elastically cushions the upper needle seat (1) and the lower needle seat (2) ) A split assembly structure or a one-shot molding structure.