WO2015070525A1 - Needle base structure for pulled-back fixed-needle safe self-destroying syringe - Google Patents

Needle base structure for pulled-back fixed-needle safe self-destroying syringe Download PDF

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Publication number
WO2015070525A1
WO2015070525A1 PCT/CN2014/001012 CN2014001012W WO2015070525A1 WO 2015070525 A1 WO2015070525 A1 WO 2015070525A1 CN 2014001012 W CN2014001012 W CN 2014001012W WO 2015070525 A1 WO2015070525 A1 WO 2015070525A1
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Prior art keywords
annular
needle seat
needle
elastic
ring
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PCT/CN2014/001012
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French (fr)
Chinese (zh)
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王祖扬
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王祖扬
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Publication of WO2015070525A1 publication Critical patent/WO2015070525A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/34—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3234—Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/323—Connection between plunger distal end and needle hub proximal end, e.g. stud protruding from the plunger

Definitions

  • the utility model relates to the technical field of medical instruments, in particular to a needle seat structure for a self-destructing syringe for a pull-back fixed needle, in particular to a mechanical connection structure thereof.
  • the inner needle seat structure of the syringe includes an inner needle seat body, and the lower end of the inner needle seat body is provided with a pull-back locking cavity, wherein the inner needle seat body is provided with a needle base and integrated with the needle base
  • the structural elastic sealing limit base is formed, and the two are integrated into a single structure, and an annular step or an annular slope is formed between the needle base and the elastic sealing limit base, and the surface of the elastic sealing limit base is opened.
  • the annular buffer gap forms an annular seal limit engagement portion at the outer wall of the elastic sealing limit base outside the annular buffer gap.
  • the function of retracting the needle by using the barb body is realized, and the safe injection is realized.
  • 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.
  • 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.
  • 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.
  • 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. .
  • the purpose of the utility model is to provide a needle seat structure for a pull-back fixed needle safety 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 holders of the double needle seat, or can be disposed at the inner wall of the cylinder; the shape, size or thickness and position of the elastic engagement 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.
  • the needle seat 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.
  • 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
  • the technical solution of the present invention is: a needle seat structure for a pull-back fixed needle safety self-destructing syringe, which comprises an elastic buffer upper needle seat at the upper portion and a lower needle seat at the lower portion, two
  • the utility model is characterized in that the elastic buffering upper needle seat forms a needle tube assembly column, and the elastic buffer upper needle seat has a cylindrical shape at the upper part, and the elastic buffering upper needle wall has a circular elastic shape at the lower outer wall of the needle seat.
  • annular elastic buffer gap is formed between the inner wall of the elastic sealing limit ring and the outer wall of the lower portion of the elastic buffer upper needle seat, and the lower portion of the elastic sealing limit ring body forms a connecting portion with the lower outer wall of the elastic buffer upper needle seat,
  • the elastic buffer upper needle portion of the lower portion of the connecting portion forms an annular reverse step
  • the elastic sealing limiting ring body forms an annular elastic sealing limiting portion near the outer edge of the upper edge
  • the surface of the annular elastic sealing limiting portion is curved a ridge-like shape
  • an annular engagement recess is formed at an outer wall of the elastic sealing ring below the annular elastic sealing limit portion
  • the lower needle seat is also cylindrical and has a lower needle
  • a lower limit ring is formed near the outer edge, and an annular gap is formed between the limit insert and the outer wall of the lower needle seat, and the lower end of the elastic buffer upper needle seat is located in the annular gap, and the reverse step and the limit ring
  • the angle between the inclined surface of the annular guiding slope and the horizontal plane forms an angle of 5 degrees to 85 degrees, and the inner diameter of the annular locking ring is 1 mm to 15 mm.
  • the inner wall of the annular locking ring is elastic under the action of the annular locking groove 14. .
  • the utility model discloses a needle seat structure for a self-destructing syringe for a pull-back fixed needle.
  • the upper needle seat and the lower needle seat are separated assembly structures or one injection molding, and the outer wall between the upper and lower needle seats is Forming the sealing ring assembly part, the sealing assembly structure is more stable, the indented rubber ring assembly structure can effectively prevent leakage and further reduce the residual amount of the liquid medicine, and the end of the syringe core rod used with the needle seat is provided with elastic
  • the function of the asymmetric pull-back lock; the asymmetric structure and the elastic function design ensure that the lock member can be smoothly inserted into the inner cavity of the elastic buffer under the elastic buffer, and utilize the function of elastic expansion to realize the barb component and the elastic buffer The card of the hub is merged and locked.
  • 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.
  • 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.
  • 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.
  • Figure 1 is a schematic view of the structure of the present invention.
  • FIG. 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.
  • the utility model relates to a needle seat structure for a self-destructing syringe for a pull-back fixed needle. As shown in FIG. 1 , it comprises an elastic buffer upper needle seat 1 at the upper part and a lower needle seat 2 at the lower part, two Connected by socket
  • the utility model is characterized in that: the upper part of the elastic buffer upper needle seat 1 forms a needle tube assembly column 3, and the lower part of the elastic buffer upper needle seat 1 has a cylindrical shape, and an elastic buffering upper needle wall 1 forms an annular elastic sealing limit ring body at the lower outer wall of the upper needle seat 1 4.
  • An annular elastic buffer gap 5 is formed between the inner wall of the elastic sealing ring body 4 and the lower outer wall of the elastic buffer upper needle seat 1.
  • the lower portion of the elastic sealing ring body 4 forms a connecting portion with the lower outer wall of the elastic buffer upper needle seat 1.
  • the elastic buffer upper needle seat 1 at the lower portion of the connecting portion 6 forms an annular reverse step 7
  • the elastic sealing ring body 4 forms an annular elastic sealing limit portion 8 near the outer edge of the upper edge, the annular elastic seal
  • the surface of the limiting portion 8 has an arc-shaped bulging shape, and an annular engaging recess portion 9 is formed at an outer wall of the elastic sealing ring body 4 below the annular elastic sealing limiting portion 8.
  • the lower needle holder 2 is also cylindrical and lower.
  • a lower limit insertion ring 10 is formed at a lower portion of the needle seat 2 near the outer edge, and an annular gap 11 is formed between the limit insertion ring 10 and the outer wall of the lower needle holder 2, and the lower end of the elastic buffer upper needle holder 1 is located in the annular gap 11.
  • the reverse step 7 and the upper end of the limit insert 10 are shaped
  • the annular sealing rubber ring fitting portion 12 is located in the annular sealing rubber ring fitting portion 12.
  • the inner cavity of the lower needle housing 2 is hollow, and an annular locking ring 13 is formed at the inner wall of the hollow inner cavity.
  • the upper surface of the ring 13 forms an annular locking groove 14, and the lower surface of the annular locking ring 13 forms an annular guiding inclined surface 15, and the inclined surface of the annular guiding inclined surface 15 forms an angle of 5 degrees - 85 degrees with the horizontal plane, and the annular guiding oblique surface faces
  • the asymmetric pull-back locking member (barb member) at the end of the core rod has a guiding function, and at the same time guides the barb member to deform when sliding into the inner cavity of the needle seat, and at the same time, when the needle seat is pulled into the inner cavity of the barrel, The deflection is made to one side, and the annular guiding bevel 18 allows for the space required for deflection.
  • the inclined surface of the annular guiding inclined surface 15 forms an angle of 5 degrees - 85 degrees with the horizontal plane, and the inner diameter of the annular locking ring 13 is 1 mm - 15 mm.
  • the inner wall of the annular locking ring 13 is elastic under the action of the annular locking groove 14. .
  • the lower inner cavity of the elastic buffer upper needle seat 1 is hollow, and an annular inner concave ring 18 is formed at the inner wall of the hollow inner cavity.
  • the outer wall of the lower needle hub 2 forms an annular engagement collar 16 that engages with the annular engagement inner concave ring 18.
  • the annular lock groove 14 has a substantially triangular cross section.
  • the annular elastic buffer gap 5 has a gap width of 0.3 mm to 6.8 mm and a depth of 1 mm to 8.6 mm, and the elastic sealing ring body 4 has a thickness ranging from 0.06 mm to 8 mm.
  • the height difference between the highest point of the annular elastic seal limiting portion 8 and the lowest point of the annular engagement recess portion 9 is 0.1 mm to 8 mm.
  • the elastic buffer upper needle seat 1 and the lower needle seat 2 are in a split assembly structure or a single injection molding structure.
  • 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 with the overall design of the product; however, no matter what the method is, as long as the corresponding and mutual fit are formed at the inner needle seat or the inner wall of the cylinder.
  • the elastic buffering mechanism can be used.
  • 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
  • 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.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
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Abstract

Disclosed is a needle base for a pulled-back fixed-needle safe self-destroying syringe, comprising an 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 tube-assembling column (3) and the lower part of the elastic cushioning upper needle base (1) is cylindrical; an annular elastic sealing limiting ring body (4) is formed at the outer wall of the lower part of the elastic cushioning upper needle base (1); an annular elastic cushioning gap (5) is formed between the inner wall of the elastic sealing limiting ring body (4) and the outer part of the lower part of the elastic cushioning upper needle base (1); a connection portion (6) is formed between the lower part of the elastic sealing limiting ring body (4) and the outer wall of the lower part of the elastic cushioning upper needle base (1); and an annular reverse step (7) is formed at the elastic cushioning upper needle base (1) located at the lower part of the connection portion (6). The needle base structure is rational in structure, simple in operation and use, stable in working conditions, and has the characteristics of safety and practicality.

Description

一种用于回拉式固定针安全自毁注射器的针座结构Needle seat structure for pull-back fixed needle safety self-destructing syringe 技术领域Technical field
本实用新型涉及医疗器械的技术领域，具体的说是一种用于回拉式固定针安全自毁注射器的针座结构，特别涉及其机械连接结构。The utility model relates to the technical field of medical instruments, in particular to a needle seat structure for a self-destructing syringe for a pull-back fixed needle, in particular to a mechanical connection structure thereof.
背景技术Background technique
对比文件，专利号：ZL201120188751.2，申请日：2011.06.07，公告号：CN202105269U，专利权人：倍安德普医疗科技(上海)有限公司，本案公开了“一种用于安全自毁式注射器的内针座结构”，包括内针座本体，内针座本体下端开设有回拉锁定腔，其特征在于：所述内针座本体处设有针管基座，和与针管基座成一体结构的弹性密封限位基座构成，两者成一体式单体结构，针管基座与弹性密封限位基座之间形成环状台阶或环状坡面，弹性密封限位基座表面开设有环状缓冲间隙，环状缓冲间隙外侧的弹性密封限位基座外壁处形成环状密封限位卡合部。Comparative document, patent number: ZL201120188751.2, application date: 2011.06.07, announcement number: CN202105269U, patentee: Beyond Depp Medical Technology (Shanghai) Co., Ltd., this case discloses "a kind of self-destruction for safety The inner needle seat structure of the syringe includes an inner needle seat body, and the lower end of the inner needle seat body is provided with a pull-back locking cavity, wherein the inner needle seat body is provided with a needle base and integrated with the needle base The structural elastic sealing limit base is formed, and the two are integrated into a single structure, and an annular step or an annular slope is formed between the needle base and the elastic sealing limit base, and the surface of the elastic sealing limit base is opened. The annular buffer gap forms an annular seal limit engagement portion at the outer wall of the elastic sealing limit base outside the annular buffer gap.
现有安全注射器结构中有利用倒钩体实现针头回缩的功能，实现安全注射。一般倒钩体为金属件或塑料件。金属件需要加工并与芯杆配合或组装，制作工艺复杂，难度大且稳定性不佳，不但增加了加工工序和制造成本，而且金属件本身及其装配过程会增加产品在安全性及产品质量方面的隐患等不确定性。现有塑料倒钩件在结构上仍存在缺陷或有不完善的地方，因此导致产品在使用过程中存在安全隐患或安全漏洞。现有的塑料倒扣件设计，虽能实现针头回拉功能，但在使用中，针头被回拉后仍然处于正常轨迹，针头有可能被再次推出造成使用者被二次损伤的风险。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.
另外，现有的单针座回抽式安全自毁式注射器或安全注射器均存在同一个难题，就是如何解决内针座与筒体之间卡合稳定并达到一定的强度以符合稳定性要求；同时，在回抽针座时所需拉力不能太大以方便使用。硬性配合结构虽然能达到内针座与筒体内壁稳定的锁定效果，但很难甚至是无法同时达到方便使用的需求。塑料材料本身存在的不稳定性和易受环境温度变化的特性会导致硬配合结构的产品稳定性极差，生产过程中质量和精度都难以控制，几乎无法实现批量生产。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.
再者，对比文件中改进款的内针座结构虽然基本能实现与筒体之间的稳定性要求，但内针座与注射器筒体之间需装配密封胶环才能实现密封功能，密封胶环设置的方式和位置直接影响注射器的密封效果和注射时的药液残留量，现有的内针座密封胶环装配后在运输和使用过程中会发生位移，而且药液残留量也不甚理想。 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. .
综上所述，仍然需要对现有回拉式注射器针座与筒体之间的锁定结构和密封胶环装配结构进行进一步改进，以进一步完善产品在使用过程中的安全性和稳定性，降低药液残留量，同时达到简化加工工序，降低制造成本的目的。In summary, it is still necessary to further improve the locking structure and the sealing ring assembly structure between the existing pull-back syringe needle seat and the cylinder to further improve the safety and stability of the product during use, and reduce The residual amount of the chemical liquid simultaneously achieves the purpose of simplifying the processing process and reducing the manufacturing cost.
发明内容Summary of the invention
本实用新型的目的在于提供一种用于回拉式固定针安全自毁注射器的针座结构，该注射器双针座可与注射器筒体之间通过弹性缓冲卡合机构相互锁定。巧妙运用卡合部位的缓冲间隙和卡合部件的可塑性，完美实现两者的锁定和脱离效果。该弹性缓冲卡合机构可设置于双针座的上下针座处，亦可设置于筒体内壁处；弹性卡合体的形状、大小或厚度和位置可随产品整体设计而变换；但无论采用何种方式，只要同时在内针座或筒体内壁处形成相对应和相互配合的弹性缓冲卡合机构即可。与之配合的注射器芯杆端部设有带弹性功能的非对称锁定件，该锁定件可与注射器双针座的下针座内腔通过卡合方式相互锁定。当针座被回拉至注射器筒体内时，在非对称弹性结构的力量作用下，针座会受力顺势向一侧偏转；注射针也因此会向近四十五角方向倒向筒体内壁一侧；当注射针完全退回筒体后，针头会被筒体颈部锁定，由此导致注射针及针座无法被再次推出筒体外，有效防止针头被再次推出造成的二次损伤，实现注射器的安全自毁操作，同时，上下针座之间形成密封胶环装配部，使得密封装配结构更加稳定，内陷式胶环装配结构可有效防止渗漏和进一步降低药液残留量，克服了现有技术中存在的缺点和不足。The purpose of the utility model is to provide a needle seat structure for a pull-back fixed needle safety 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 holders of the double needle seat, or can be disposed at the inner wall of the cylinder; the shape, size or thickness and position of the elastic engagement 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.
为了实现上述目的，本实用新型的技术方案是：一种用于回拉式固定针安全自毁注射器的针座结构，它包括位于上部的弹性缓冲上针座和位于下部的下针座，两者通过套接卡合方式连接成一体，其特征在于：所述弹性缓冲上针座上部形成针管装配柱，弹性缓冲上针座下部呈圆柱形，弹性缓冲上针座下部外壁处形成环形的弹性密封限位环体，该弹性密封限位环体内壁与弹性缓冲上针座下部外壁之间形成环形弹性缓冲间隙，弹性密封限位环体下部与弹性缓冲上针座下部外壁形成连接部，该连接部下部的弹性缓冲上针座处形成环形的反向台阶，弹性密封限位环体靠近上边缘的外部处形成环状弹性密封限位部，该环状弹性密封限位部表面呈弧形***状，环状弹性密封限位部下方的弹性密封限位环体外壁处形成环形卡合凹陷部，所述下针座亦呈圆柱形，下针座下部靠近外边缘处形成限位插环，该限位插环与下针座外壁之间形成环状间隙，弹性缓冲上针座的下端位于环状间隙内，上述反向台阶与限位插环上端之间形成环形的密封胶圈装配部，密封胶圈位于该环形的密封胶圈装配部内，下针座内腔中空，中空内腔的内壁处形成环状锁定环，该环状锁定环上表面形成环形锁槽，环状锁定环的下表面形成环形导向斜面，该环形导向斜面的斜面与水平面之间形成5度-85度的 夹角，上述环形导向斜面的斜面与水平面之间形成5度-85度的夹角，环状锁定环的内径为1mm-15mm，环状锁定环的内壁在环形锁槽14的作用下具有弹性。In order to achieve the above object, the technical solution of the present invention is: a needle seat structure for a pull-back fixed needle safety self-destructing syringe, which comprises an elastic buffer upper needle seat at the upper portion and a lower needle seat at the lower portion, two The utility model is characterized in that the elastic buffering upper needle seat forms a needle tube assembly column, and the elastic buffer upper needle seat has a cylindrical shape at the upper part, and the elastic buffering upper needle wall has a circular elastic shape at the lower outer wall of the needle seat. a sealing limit ring body, an annular elastic buffer gap is formed between the inner wall of the elastic sealing limit ring and the outer wall of the lower portion of the elastic buffer upper needle seat, and the lower portion of the elastic sealing limit ring body forms a connecting portion with the lower outer wall of the elastic buffer upper needle seat, The elastic buffer upper needle portion of the lower portion of the connecting portion forms an annular reverse step, and the elastic sealing limiting ring body forms an annular elastic sealing limiting portion near the outer edge of the upper edge, and the surface of the annular elastic sealing limiting portion is curved a ridge-like shape, an annular engagement recess is formed at an outer wall of the elastic sealing ring below the annular elastic sealing limit portion, and the lower needle seat is also cylindrical and has a lower needle A lower limit ring is formed near the outer edge, and an annular gap is formed between the limit insert and the outer wall of the lower needle seat, and the lower end of the elastic buffer upper needle seat is located in the annular gap, and the reverse step and the limit ring An annular sealing apron assembly portion is formed between the upper ends, the sealing rubber ring is located in the annular sealing rubber ring fitting portion, the inner cavity of the lower needle seat is hollow, and an annular locking ring is formed at the inner wall of the hollow inner cavity, the annular locking ring is formed The surface forms an annular locking groove, and 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 degree of 5 degrees to 85 degrees with the horizontal plane. The angle between the inclined surface of the annular guiding slope and the horizontal plane forms an angle of 5 degrees to 85 degrees, and the inner diameter of the annular locking ring is 1 mm to 15 mm. The inner wall of the annular locking ring is elastic under the action of the annular locking groove 14. .
本实用新型公开了一种用于回拉式固定针安全自毁注射器的针座结构，上针座和下针座之间为分体式装配结构或一次注塑成型，上下针座之间的外壁处形成密封胶环装配部，使得密封装配结构更加稳定，内陷式胶环装配结构可有效防止渗漏和进一步降低药液残留量，与针座配套使用的注射器芯杆的端部设有带弹性功能的非对称回拉锁定件；非对称性结构配合弹性功能设计，可确保该锁定件能顺利***弹性缓冲下针座内腔，并利用其弹性扩张的功能，实现倒钩部件与弹性缓冲下针座的卡合并锁定。由于环形锁槽设计也具有弹性缓冲特性，当与非对称回拉锁定件(倒钩部件)在推进状态触及时，两者都会产生相对的缓冲变形，便于非对称回拉锁定件(倒钩部件)卡入环状锁定环的锁槽内；在锁定件回抽时与环状锁定环的锁槽相互锁定。当针头部被回拉至注射器筒体内时，在非对称作用力的受力环境下，针头部整体会受力向一侧偏转，注射针会因此向近四十五角方向倒向筒体内壁一侧；当注射针完全退回筒体后，针头会被筒体颈部锁定，由此导致注射针及针座无法被再次推出筒体外，有效防止针头被再次推出造成二次损伤，真正实现注射器的安全自毁操作。在本发明具体实施时，所述的非对称弹性回拉锁定件为一塑料倒钩体。该塑料倒钩体采用非对称性和弹性体结构巧妙配合的设计原理，运用特定的角度和尺寸设计，使得倒钩本体具备弹性缓冲锁定功能。上述非对称弹性回拉锁定件与芯杆成一体结构，整体部件采用一次开模成型，无需单独加工或后续装配，有效降低了制造成本，简化了装配工艺，减少了装配工序。芯杆端部的非对称弹性回拉件与针座内腔的卡合锁定效果极佳，产品整体结构合理，构思巧妙，操作使用简单，工作状态稳定，易于推广应用。相比现有产品设计和技术而言，设计上具有显著的技术性突破，并具有突出的安全性和实用性特点。The utility model discloses a needle seat structure for a self-destructing syringe for a pull-back fixed needle. The upper needle seat and the lower needle seat are separated assembly structures or one injection molding, and the outer wall between the upper and lower needle seats is Forming the sealing ring assembly part, the sealing assembly structure is more stable, the indented rubber ring assembly structure can effectively prevent leakage and further reduce the residual amount of the liquid medicine, and the end of the syringe core rod used with the needle seat is provided with elastic The function of the asymmetric pull-back lock; the asymmetric structure and the elastic function design ensure that the lock member can be smoothly inserted into the inner cavity of the elastic buffer under the elastic buffer, and utilize the function of elastic expansion to realize the barb component and the elastic buffer The card of the hub is merged and locked. 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.
附图说明DRAWINGS
图1为本实用新型结构示意图。Figure 1 is a schematic view of the structure of the present invention.
图2为本实用新型弹性缓冲上针座结构示意图。2 is a schematic view showing the structure of the elastic buffer upper needle seat of the present invention.
图3为本实用新型下针座结构示意图。Figure 3 is a schematic view showing the structure of the lower needle seat of the present invention.
图4为本实用新型使用状态图。Figure 4 is a view showing the state of use of the present invention.
具体实施方式detailed description
下面参照附图，对本实用新型进一步进行描述。The present invention will be further described below with reference to the accompanying drawings.
本实用新型为一种用于回拉式固定针安全自毁注射器的针座结构，如图1中所示，它包括位于上部的弹性缓冲上针座1和位于下部的下针座2，两者通过套接卡合方式连接成 一体，其特征在于：所述弹性缓冲上针座1上部形成针管装配柱3，弹性缓冲上针座1下部呈圆柱形，弹性缓冲上针座1下部外壁处形成环形的弹性密封限位环体4，该弹性密封限位环体4内壁与弹性缓冲上针座1下部外壁之间形成环形弹性缓冲间隙5，弹性密封限位环体4下部与弹性缓冲上针座1下部外壁形成连接部6，该连接部6下部的弹性缓冲上针座1处形成环形的反向台阶7，弹性密封限位环体4靠近上边缘的外部处形成环状弹性密封限位部8，该环状弹性密封限位部8表面呈弧形***状，环状弹性密封限位部8下方的弹性密封限位环体4外壁处形成环形卡合凹陷部9，所述下针座2亦呈圆柱形，下针座2下部靠近外边缘处形成限位插环10，该限位插环10与下针座2外壁之间形成环状间隙11，弹性缓冲上针座1的下端位于环状间隙11内，上述反向台阶7与限位插环10上端之间形成环形的密封胶圈装配部12，密封胶圈17位于该环形的密封胶圈装配部12内，下针座2内腔中空，中空内腔的内壁处形成环状锁定环13，该环状锁定环13上表面形成环形锁槽14，环状锁定环13的下表面形成环形导向斜面15，该环形导向斜面15的斜面与水平面之间形成5度-85度的夹角，该环形导向斜面对芯杆端部的非对称回拉锁定件(倒钩部件)有导向作用，同时引导倒钩部件在滑入针座内腔时发生变形，同时，在针座被拉入筒体内腔时，会向一侧发生偏转，环形导向斜面18能留出偏转时所需空间。上述环形导向斜面15的斜面与水平面之间形成5度-85度的夹角，环状锁定环13的内径为1mm-15mm，环状锁定环13的内壁在环形锁槽14的作用下具有弹性。The utility model relates to a needle seat structure for a self-destructing syringe for a pull-back fixed needle. As shown in FIG. 1 , it comprises an elastic buffer upper needle seat 1 at the upper part and a lower needle seat 2 at the lower part, two Connected by socket The utility model is characterized in that: the upper part of the elastic buffer upper needle seat 1 forms a needle tube assembly column 3, and the lower part of the elastic buffer upper needle seat 1 has a cylindrical shape, and an elastic buffering upper needle wall 1 forms an annular elastic sealing limit ring body at the lower outer wall of the upper needle seat 1 4. An annular elastic buffer gap 5 is formed between the inner wall of the elastic sealing ring body 4 and the lower outer wall of the elastic buffer upper needle seat 1. The lower portion of the elastic sealing ring body 4 forms a connecting portion with the lower outer wall of the elastic buffer upper needle seat 1. The elastic buffer upper needle seat 1 at the lower portion of the connecting portion 6 forms an annular reverse step 7 , and the elastic sealing ring body 4 forms an annular elastic sealing limit portion 8 near the outer edge of the upper edge, the annular elastic seal The surface of the limiting portion 8 has an arc-shaped bulging shape, and an annular engaging recess portion 9 is formed at an outer wall of the elastic sealing ring body 4 below the annular elastic sealing limiting portion 8. The lower needle holder 2 is also cylindrical and lower. A lower limit insertion ring 10 is formed at a lower portion of the needle seat 2 near the outer edge, and an annular gap 11 is formed between the limit insertion ring 10 and the outer wall of the lower needle holder 2, and the lower end of the elastic buffer upper needle holder 1 is located in the annular gap 11. The reverse step 7 and the upper end of the limit insert 10 are shaped The annular sealing rubber ring fitting portion 12 is located in the annular sealing rubber ring fitting portion 12. The inner cavity of the lower needle housing 2 is hollow, and an annular locking ring 13 is formed at the inner wall of the hollow inner cavity. The upper surface of the ring 13 forms an annular locking groove 14, and the lower surface of the annular locking ring 13 forms an annular guiding inclined surface 15, and the inclined surface of the annular guiding inclined surface 15 forms an angle of 5 degrees - 85 degrees with the horizontal plane, and the annular guiding oblique surface faces The asymmetric pull-back locking member (barb member) at the end of the core rod has a guiding function, and at the same time guides the barb member to deform when sliding into the inner cavity of the needle seat, and at the same time, when the needle seat is pulled into the inner cavity of the barrel, The deflection is made to one side, and the annular guiding bevel 18 allows for the space required for deflection. The inclined surface of the annular guiding inclined surface 15 forms an angle of 5 degrees - 85 degrees with the horizontal plane, and the inner diameter of the annular locking ring 13 is 1 mm - 15 mm. The inner wall of the annular locking ring 13 is elastic under the action of the annular locking groove 14. .
在具体实施时，所述弹性缓冲上针座1下部内腔中空，该中空内腔的内壁处形成环形卡合内凹环18。In a specific implementation, the lower inner cavity of the elastic buffer upper needle seat 1 is hollow, and an annular inner concave ring 18 is formed at the inner wall of the hollow inner cavity.
在具体实施时，所述下针座2外壁形成与环形卡合内凹环18配合的环形卡合凸环16。In a specific implementation, the outer wall of the lower needle hub 2 forms an annular engagement collar 16 that engages with the annular engagement inner concave ring 18.
在具体实施时，所述环形锁槽14的截面近似呈三角形。In a specific implementation, the annular lock groove 14 has a substantially triangular cross section.
在具体实施时，所述环形弹性缓冲间隙5的间隙宽度为0.3mm-6.8mm，深度为1mm-8.6mm，弹性密封限位环体4的厚度范围为0.06mm-8mm。In a specific implementation, the annular elastic buffer gap 5 has a gap width of 0.3 mm to 6.8 mm and a depth of 1 mm to 8.6 mm, and the elastic sealing ring body 4 has a thickness ranging from 0.06 mm to 8 mm.
在具体实施时，所述环状弹性密封限位部8最高点与环形卡合凹陷部9的最低点之间的落差高度为0.1mm-8mm。In a specific implementation, the height difference between the highest point of the annular elastic seal limiting portion 8 and the lowest point of the annular engagement recess portion 9 is 0.1 mm to 8 mm.
在具体实施时，所述弹性缓冲上针座1和下针座2之间呈分体式装配结构或一次注塑成型结构。In a specific implementation, the elastic buffer upper needle seat 1 and the lower needle seat 2 are in a split assembly structure or a single injection molding structure.
在具体实施时，由弹性密封限位环体所构成的弹性缓冲卡合机构可设置于双针座的上下针座处，亦可设置于筒体内壁处，弹性体的形状、大小、厚度和位置可随产品的整体设计而变换；但无论采用何种方式，只要同时在内针座或筒体内壁处形成相对应和相互配合的 弹性缓冲卡合机构即可。弹性密封限位环体可由多种形式实现，并非只能是一个封闭的环体，如断开几处的环体或者由多个弹性卡合部构成的环体，应当说只要是通过弹性部件通过弹性卡合方式连接针座和筒体的结构都应当视为属于本实用新型的保护范围。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 with the overall design of the product; however, no matter what the method is, as long as the corresponding and mutual fit are formed at the inner needle seat or the inner wall of the cylinder. The elastic buffering mechanism can be used. 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.
以上内容是结合具体的优选实施方式对本实用新型所作的进一步详细说明，不能认定本实用新型具体实施只局限于上述这些说明。对于本实用新型所属技术领域的普通技术人员来说，在不脱离本实用新型构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本实用新型的保护范围。 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 (7)

  1. 一种用于回拉式固定针安全自毁注射器的针座结构，它包括位于上部的弹性缓冲上针座(1)和位于下部的下针座(2)，两者通过套接卡合方式连接成一体，其特征在于：所述弹性缓冲上针座(1)上部形成针管装配柱(3)，弹性缓冲上针座(1)下部呈圆柱形，弹性缓冲上针座(1)下部外壁处形成环形的弹性密封限位环体(4)，该弹性密封限位环体(4)内壁与弹性缓冲上针座(1)下部外壁之间形成环形弹性缓冲间隙(5)，弹性密封限位环体(4)下部与弹性缓冲上针座(1)下部外壁形成连接部(6)，该连接部(6)下部的弹性缓冲上针座(1)处形成环形的反向台阶(7)，弹性密封限位环体(4)靠近上边缘的外部处形成环状弹性密封限位部(8)，该环状弹性密封限位部(8)表面呈弧形***状，环状弹性密封限位部(8)下方的弹性密封限位环体(4)外壁处形成环形卡合凹陷部(9)，所述下针座(2)亦呈圆柱形，下针座(2)下部靠近外边缘处形成限位插环(10)，该限位插环(10)与下针座(2)外壁之间形成环状间隙(11)，弹性缓冲上针座(1)的下端位于环状间隙(11)内，上述反向台阶(7)与限位插环(10)上端之间形成环形的密封胶圈装配部(12)，密封胶圈(17)位于该环形的密封胶圈装配部(12)内，下针座(2)内腔中空，中空内腔的内壁处形成环状锁定环(13)，该环状锁定环(13)上表面形成环形锁槽(14)，环状锁定环(13)的下表面形成环形导向斜面(15)，该环形导向斜面(15)的斜面与水平面之间形成5度-85度的夹角，环状锁定环(13)的内径为1mm-15mm，环状锁定环(13)的内壁在环形锁槽(14)的作用下具有弹性。A needle seat structure for a pull-back fixed needle safety self-destructing syringe, comprising an elastic buffer upper needle seat (1) at an upper portion and a lower needle seat (2) at a lower portion, which are engaged by a sleeve The utility model is characterized in that: the upper part of the elastic buffer upper needle seat (1) forms a needle tube assembly column (3), and the elastic buffer upper needle seat (1) has a cylindrical shape at the lower part, and elastically buffers the upper outer wall of the upper needle seat (1). Forming an annular elastic sealing ring body (4), an annular elastic buffering gap (5) is formed between the inner wall of the elastic sealing ring body (4) and the lower outer wall of the elastic buffer upper needle seat (1), and the elastic sealing limit is The lower portion of the ring body (4) forms a connecting portion (6) with the lower outer wall of the elastic buffer upper needle seat (1), and the elastic buffer upper needle seat (1) at the lower portion of the connecting portion (6) forms an annular reverse step (7). The elastic sealing limit ring body (4) forms an annular elastic sealing limit portion (8) near the outer edge of the upper edge, and the surface of the annular elastic sealing limit portion (8) has an arc-shaped bulging shape and an annular elasticity An annular engagement recess (9) is formed at an outer wall of the elastic sealing ring body (4) below the sealing limiting portion (8), and the lower needle seat (2) is also cylindrical. A limiting ring (10) is formed at a lower portion of the needle seat (2) near the outer edge, and an annular gap (11) is formed between the limiting ring (10) and the outer wall of the lower needle seat (2), and the elastic buffer upper needle seat The lower end of (1) is located in the annular gap (11), and the annular sealing ring fitting portion (12) is formed between the reverse step (7) and the upper end of the limiting ring (10), and the sealing rubber ring (17) 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 (13) is formed at the inner wall of the hollow inner cavity, and the upper surface of the annular locking ring (13) is formed. The annular lock groove (14), the lower surface of the annular locking ring (13) forms an annular guiding slope (15), the inclined surface of the annular guiding slope (15) forms an angle of 5 degrees - 85 degrees with the horizontal plane, and the ring shape The inner diameter of the locking ring (13) is from 1 mm to 15 mm, and the inner wall of the annular locking ring (13) is elastic under the action of the annular locking groove (14).
  2. 根据权利要求1所述的一种用于回拉式固定针安全自毁注射器的针座结构，其特征在于：所述弹性缓冲上针座(1)下部内腔中空，该中空内腔的内壁处形成环形卡合内凹环(18)。The needle seat structure for a pull-back fixed needle safety self-destructing syringe according to claim 1, wherein the lower inner cavity of the elastic buffer upper needle seat (1) is hollow, and the inner wall of the hollow inner cavity A ring-shaped inner concave ring (18) is formed at the portion.
  3. 根据权利要求1所述的一种用于回拉式固定针安全自毁注射器的针座结构，其特征在于：所述下针座(2)外壁形成与环形卡合内凹环(18)配合的环形卡合凸环(16)。The needle seat structure for a pull-back fixed needle safety self-destructing syringe according to claim 1, wherein the outer wall of the lower needle seat (2) is formed to cooperate with the annular engagement inner concave ring (18). The ring snaps into the collar (16).
  4. 根据权利要求1所述的一种用于回拉式固定针安全自毁注射器的针座结构，其特征在于：所述环形锁槽(14)的截面近似呈三角形。A needle holder structure for a pull-back type fixed-needle safety self-destructing syringe according to claim 1, wherein the annular lock groove (14) has a substantially triangular cross section.
  5. 根据权利要求1所述的一种用于回拉式固定针安全自毁注射器的针座结构，其特征在于：所述环形弹性缓冲间隙(5)的间隙宽度为0.3mm-6.8mm，深度为1mm-8.6mm，弹性密封限位环体(4)的厚度为0.06mm-8mm。The needle seat structure for a pull-back fixed needle safety self-destructing syringe according to claim 1, wherein the annular elastic buffer gap (5) has a gap width of 0.3 mm to 6.8 mm and a depth of 1mm-8.6mm, the thickness of the elastic sealing ring body (4) is 0.06mm-8mm.
  6. 根据权利要求1所述的一种用于回拉式固定针安全自毁注射器的针座结构，其特征在于：所述环状弹性密封限位部(8)最高点与环形卡合凹陷部(9)的最低点之间的落差高度为0.1mm-8mm。The needle seat structure for a pull-back fixed needle safety self-destructing syringe according to claim 1, wherein the annular elastic sealing limit portion (8) has a highest point and a circular engagement recess portion ( The height difference between the lowest points of 9) is 0.1 mm-8 mm.
  7. 根据权利要求1所述的一种用于回拉式固定针安全自毁注射器的针座结构，其特征在于： 所述弹性缓冲上针座(1)和下针座(2)之间呈分体式装配结构或一次注塑成型结构。 A needle seat structure for a pull-back fixed needle safety self-destructing syringe according to claim 1, wherein: The elastic buffer upper needle seat (1) and the lower needle seat (2) have a split assembly structure or a single injection molding structure.
PCT/CN2014/001012 2013-10-18 2014-11-13 Needle base structure for pulled-back fixed-needle safe self-destroying syringe WO2015070525A1 (en)

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CN201320642716 2013-10-18
CN201320715307.0U CN203620007U (en) 2013-10-18 2013-11-14 Needle base structure used for pull-back safe self-destruction syringes with fixed needles
CN201320715307.0 2013-11-14

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WO2015070525A1 true WO2015070525A1 (en) 2015-05-21

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203634589U (en) * 2013-10-18 2014-06-11 王祖扬 Pullback type fixing needle safety auto-disable syringe
CN203620007U (en) * 2013-10-18 2014-06-04 王祖扬 Needle base structure used for pull-back safe self-destruction syringes with fixed needles
CN105496567A (en) * 2016-01-21 2016-04-20 钱良 Protective cover for gynecology department

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Publication number Priority date Publication date Assignee Title
US6391008B1 (en) * 2000-08-15 2002-05-21 Hsi-Chin Tsai Safety hypodermic syringe
US20070197965A1 (en) * 2006-02-21 2007-08-23 Chih-Kuang Hsu Safety syringe
CN102652849A (en) * 2011-03-02 2012-09-05 张淑茗 Needle base assembly rotating and retracting structure of safety injector
CN202569091U (en) * 2012-02-29 2012-12-05 王祖扬 Sleeve-type pullback locking assembly for pullback safety self-destruction syringe
CN202892570U (en) * 2012-02-29 2013-04-24 王祖扬 A need-pullback-type needle-replaceable safe self-destruction syringe
CN203620007U (en) * 2013-10-18 2014-06-04 王祖扬 Needle base structure used for pull-back safe self-destruction syringes with fixed needles
CN203634589U (en) * 2013-10-18 2014-06-11 王祖扬 Pullback type fixing needle safety auto-disable syringe

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6391008B1 (en) * 2000-08-15 2002-05-21 Hsi-Chin Tsai Safety hypodermic syringe
US20070197965A1 (en) * 2006-02-21 2007-08-23 Chih-Kuang Hsu Safety syringe
CN102652849A (en) * 2011-03-02 2012-09-05 张淑茗 Needle base assembly rotating and retracting structure of safety injector
CN202569091U (en) * 2012-02-29 2012-12-05 王祖扬 Sleeve-type pullback locking assembly for pullback safety self-destruction syringe
CN202892570U (en) * 2012-02-29 2013-04-24 王祖扬 A need-pullback-type needle-replaceable safe self-destruction syringe
CN203620007U (en) * 2013-10-18 2014-06-04 王祖扬 Needle base structure used for pull-back safe self-destruction syringes with fixed needles
CN203634589U (en) * 2013-10-18 2014-06-11 王祖扬 Pullback type fixing needle safety auto-disable syringe

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