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WO2013127261A1 - 一种用于安全自毁式注射器的针座结构 - Google Patents

一种用于安全自毁式注射器的针座结构 Download PDF

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Publication number
WO2013127261A1
WO2013127261A1 PCT/CN2013/000192 CN2013000192W WO2013127261A1 WO 2013127261 A1 WO2013127261 A1 WO 2013127261A1 CN 2013000192 W CN2013000192 W CN 2013000192W WO 2013127261 A1 WO2013127261 A1 WO 2013127261A1
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WIPO (PCT)
Prior art keywords
annular
groove
wall
needle
buffer gap
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PCT/CN2013/000192
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English (en)
French (fr)
Inventor
王祖扬
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Individual
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Individual
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Publication of WO2013127261A1 publication Critical patent/WO2013127261A1/zh
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Classifications

    • 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    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston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
    • A61M5/3293—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 characterised by features of the 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
    • A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/3223—Means impeding or disabling repositioning of used needles at the syringe nozzle
    • A61M2005/3224—Means to disalign the needle tip and syringe nozzle

Definitions

  • the present invention relates to the technical field of medical devices, and more particularly to a needle holder structure for a safe self-destructing syringe, and more particularly to a mechanical connection structure thereof.
  • the core rod body has a certain elasticity, wherein the longitudinal notch is narrow and wide, and the outer wall of the upper core rod of the lateral notch protrudes from the outer wall of the lower core rod, and the lateral gap can be
  • the inner end of the outer rod is in the shape of a circular arc
  • the upper needle seat is formed in a cylindrical shape
  • the upper part of the outer wall of the upper needle seat is provided with a reinforcing wing piece
  • the lower part of the outer wall of the upper needle seat is provided with a fixed convex ring of the upper needle seat
  • the outer diameter of the needle fixing collar is larger than the outer diameter of the upper needle seat by 0.05 mm - 0.3 mm
  • the lower needle seat is cylindrical
  • the inner cavity is hollow
  • the lower needle seat inner wall is provided with a lower needle seat annular fixing concave
  • the annular fixing groove of the lower needle seat can cooperate with the fixing convex ring of the upper needle seat, and the inner diameter of the upper cavity of the annular
  • the inner wall of the cylinder neck of the cylinder body is respectively provided with a cylinder neck upper limit ring and a cylinder neck lower limit ring, and the distance between the cylinder neck upper limit ring and the cylinder neck lower limit ring is 0.3 mm - 1.5 mm.
  • the ring protrudes from the inner wall of the upper end ring of the cylinder neck and the lower limit ring of the cylinder neck by 0.1 mm - 0.6 mm.
  • the lower limit ring is protruded from the inner wall of the upper neck ring of the simple neck and the lower limit ring of the cylinder neck by 0.02 mm to 0.25 mm, and the inner wall of the upper cylinder of the upper cylinder of the upper neck of the cylinder neck is between the upper limit ring of the cylinder neck and the lower limit ring of the neck of the cylinder.
  • the inner diameter of the inner cavity of the cylinder, the inner diameter of the inner cavity of the cylinder between the upper limit ring of the simple neck and the lower limit ring of the cylinder neck, the inner diameter of the inner cylinder of the lower cylinder of the lower limit of the cylinder neck, the upper limit ring of the cylinder neck and the lower limit ring of the neck The inner diameter of the inner cavity of the cylinder is smaller than the outer diameter of the annular rib of the lower needle seat 0.
  • the inner cavity of the cylinder is opposite to the cylinder
  • the inner wall of the other end of the neck is provided with a cylinder limiting rib
  • the cylindrical limiting rib can be a linear annular rib, a circular rib composed of a plurality of vertical ribs, a vertical rib, and a plurality of convex ribs formed by a plurality of convex points.
  • the inner wall of the cylinder at the lower part of the rib is provided with a convex rib in the cylinder, the distance between the limiting rib of the cylinder and the rib in the cylinder is the thickness of the annular limiting piece, and the inner diameter of the limiting rib of the cylinder is smaller than that of the annular limiting piece. diameter.
  • the function of retracting the needle by using the barb body is realized, and safety 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.
  • sexual 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 on the inner needle seat and the inner wall of the cylinder, it is difficult or even impossible to achieve the convenience of use at the same time.
  • the inherent instability of the plastic material and its susceptibility to changes in ambient temperature can result in poor stability of the product of the hard-fit structure, and the quality and precision of the production process are difficult to control, making it almost impossible to achieve mass production.
  • the syringe needle seat and the syringe barrel are mutually locked by an elastic buffer mechanism, and the expansion force is generated by the deformation of the buffer gap to achieve the locking and disengaging effect of the two.
  • the elastic buffer mechanism can be disposed at the inner needle seat, or can be disposed on the inner needle seat.
  • the needle seat and the cylinder form an elastic buffering engagement mechanism which can cooperate with each other, and the end of the core rod is provided with an asymmetric locking member with elastic function, and the locking member can be connected with the needle holder of the syringe
  • the cavities are locked to each other by snapping, and, after the needle holder is pulled back into the syringe body, the asymmetric elastic structure Under the action of the force, the needle seat will be deflected to one side, and the needle will be inverted to the side of the inner wall of the cylinder in the direction of nearly forty-five degrees, and locked by the neck of the cylinder, thereby causing the needle and the needle seat.
  • the cylinder neck cannot be pushed out again, effectively preventing the secondary damage caused by the needle being pushed out again, realizing the safe self-destruct operation of the syringe, and overcoming the shortcomings and deficiencies in the prior art.
  • the first technical solution of the present invention is: a needle holder structure for a safe self-destructing syringe, which comprises a needle holder body, wherein the lower end of the needle holder body is The outer sleeve of the needle holder body is connected with a needle tube, and the needle holder body forms an elastic sealing limit portion near the middle portion, and the surface of the elastic sealing limit portion is provided with an annular buffer gap, and the outer side of the annular buffer gap The outer wall of the elastic sealing limit portion forms an annular seal limit engagement portion.
  • the present invention discloses a needle seat structure for a safety self-destructing syringe, and an end of a syringe core rod matched therewith is provided with an asymmetric pull-back locking member with an elastic function; an asymmetrical structure with an elastic function
  • the design ensures that the locking member can be smoothly inserted into the inner cavity of the needle seat, and utilizes the function of elastic expansion to realize the card locking and locking of the sleeve-type pull-back locking component engaging portion of the inner side of the needle holder inner cavity.
  • annular groove design of the inner cavity of the outer casing pull-back locking assembly also has elastic cushioning characteristics, when the asymmetric pull-back locking member touches the advancing state, both of them will have relative buffer deformation, which facilitates the locking member to be inserted into the outer casing. Pulling back the inner cavity of the locking assembly; locking the interlocking locking assembly with the outer casing when the locking member is retracted.
  • the needle holder is pulled back into the syringe barrel, under the force of the asymmetric force, the needle seat will be deflected to one side, and the needle will be inverted toward the inner wall of the cylinder in the direction of nearly forty-five degrees.
  • the asymmetric elastic pull back locking member is a plastic barb.
  • the plastic barb body adopts the design principle of asymmetry and elastomer structure, and the specific angle and size design make the barb body have elastic buffer locking function.
  • the above asymmetric elastic pull-back locking member is integrated with the core rod, and the integral part is formed by one-time open molding, which does not require separate processing or subsequent assembly, which effectively reduces the manufacturing cost, simplifies the assembly process, and reduces the assembly process.
  • the asymmetric elastic pull-back piece at the end of the core rod has excellent engagement and locking effect on the inner cavity of the needle seat, and the overall structure of the product is reasonable, the design is clever, the operation is simple, the working state is stable, and the utility model is easy to popularize and apply. Compared with the existing product design and technology, the design has significant technical breakthrough, and has outstanding safety and practical features.
  • DRAWINGS 1 is a schematic structural view of the present invention.
  • FIG. 2 is a schematic structural view of a jacket type pull-back locking assembly of the present invention.
  • FIG. 3 is a diagram showing the state of use of the present invention.
  • the present invention is a needle seat structure for a safety self-destructing syringe, which includes a needle hub body, which is different from the prior art in that the lower end of the needle hub body is connected to the outer casing pull-back locking assembly 5,
  • the upper end of the needle hub body is equipped with a needle tube 1 , and an elastic sealing limit portion 2 is formed near the middle portion of the needle seat body, and an annular buffer gap 3 is arranged on the surface of the elastic sealing limit portion 2, and an elastic seal outside the annular buffer gap 3 is provided.
  • the outer wall of the limiting portion 2 forms an annular sealing limit engaging portion 4, and the elastic sealing limiting portion enables the stable engagement between the inner needle body and the cylinder, and the effect of lightly withdrawing.
  • the annular buffer gap 3 is an annular groove structure, the height of the slot to the bottom of the groove is 0.05mm-4mm, and the width of the annular buffer gap 3 is 0.05mm-4mm, ring buffer
  • the distance between the outer groove wall of the gap 3 and the arc top of the surface of the annular seal limit engagement portion 4 is 0.1 mm-6 mm, and the outer groove wall groove of the annular buffer gap 3 and the outer wall of the annular seal limit engagement portion 4
  • the distance between the gaps is 0.1 mm-6 mm
  • the distance between the bottom of the outer groove wall of the annular buffer gap 3 and the outer wall of the annular seal limit engagement portion 4 is 0.1 mm-6 m m
  • the annular sealing limit is engaged.
  • the surface of the portion 4 is curved, and the distance from the surface of the annular sealing limit engaging portion 4 to the edge of the curved surface is smaller than the distance from the top of the arc to the lower edge of the curved surface.
  • the annular sealing limit engaging portion 4 An annular recess 6 is formed at the outer wall of the lower elastic seal limiting portion 2.
  • the annular recess 6 is located on the same horizontal surface as the groove bottom of the annular buffer gap 3 or higher than the groove bottom of the annular buffer gap 3.
  • At least one annular limiting rib 7 is formed on the outer wall of the lower end of the needle seat body, and the inner wall of the inner cavity of the upper end of the outer casing pull-back locking component 5 is matched with the annular limiting rib 7
  • the inner casing of the outer casing pull-back locking assembly 5 is hollow, and an inner wall of the inner cavity forms an annular engagement locking portion 9 near the lower end opening.
  • the upper portion of the annular locking locking portion 9 forms an annular groove 10
  • the inner side wall 11 of the annular groove 10 has a thickness of 0.01 mm to 3 mm
  • the inner side wall of the annular groove 10 and the annular groove 10 an angle of 2 to 90 degrees is formed between the outer side walls 12, and an inner diameter formed at the upper end of the inner wall of the annular groove 10 is Lmm-80mm.
  • the notch width of the annular groove 10 is greater than the groove width.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Environmental & Geological Engineering (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Description

一种用于安全自毁式注射器的针座结构 技术领域
(0001] 本发明涉及医疗器械的技术领域， 具体的说是一种用于安全自毁式注射 器的针座结构， 特别涉及其机械连接结构。
背景技术
[0002] 对比文件一， 专利号： ZL200710047077.4, 申请日： 2007.10.16, 公告号: CN101411908 , 专利权人： 上海顶尖堂生化科技有限公司， 本案公开了 "一种安 全自毁式疫苗注射器"， 包括筒体， 筒体内设有芯杆， 芯杆靠近端部处设有胶塞， 筒体的筒颈内设有针头， 针头处设有针管， 其特征在于： 所述芯杆端部的杆体侧 壁设有横向缺口，横向缺口与芯杆端部杆体处的纵向缺口相联通，横向缺口与纵 向缺口相配合， 针头由上针座和下针座套接而成， 下针座内腔中空， 下针座成筒 状结构， 下针座相对于安装]:针头座的另一端开口处内壁设有下针头座凸筋， 芯 杆端部设有由横向缺口和纵向缺口联通而形成的弹性体，此处的芯杆杆体具有一 定的弹性， 其中纵向缺口呈上窄下宽状， 而横向缺口外部开口处上部芯杆杆体外 壁凸出于此处下部芯杆杆体外壁，横向缺口可为外髙内低状，芯杆端部成圆弧状， 上针座成柱体状， 上针座外壁上段设有加强翼片， 上针座外壁下段设有上针座固 定凸环， 上针座固定凸环的外直径大于上针座外壁直径 0.05mm— 0.3mm, 所述 下针座成柱体状， 其内腔中空， 下针座腔体内壁处设有下针头座环形固定凹槽， 下针头座环形固定凹槽可与上针座固定凸环相配合，下针头座环形固定凹槽上部 腔体的内径小于上针座固定凸环上部杆体外壁外径 0.1 mm— 0.35mm, 下针头座 环形固定凹槽下部腔体的内径 上针座固定凸环下部杆体外壁外径，下针座相对 于下针头座凸环的另一端外壁端部处设有下针头座环形凸筋，所述筒体的筒颈内 壁处分别设有筒颈上限位环和筒颈下限位环，筒颈上限位环和筒颈下限位环之间 的距离为 0.3mm— 1.5mm. 筒颈上限位环凸出于筒颈上限位环和筒颈下限位环 之间内壁 0.1mm— 0.6mm，筒颈下限位环凸出于简颈上限位环和筒颈下限位环之 间内壁 0.02mm— 0.25mm,筒颈上限位环上部筒体内腔的内径 筒颈上限位环和 筒颈下限位环之间筒体内腔的内径，简颈上限位环和筒颈下限位环之间筒体内腔 的内径 ΐ≡筒颈下限位环下部筒体内腔的内径，筒颈上限位环和简颈下限位环之间 筒体内腔的内径小于下针头座环形凸筋外径 0. 1 mm— 0.5mm，筒体内腔相对于筒 颈的另一端内壁处设有筒体限位筋， 筒体限位筋可为线性环形筋、多条竖筋构成 的环形筋、 一条竖筋、 多个凸起点构成的环形筋， 筒体限位筋下部的筒体内壁处 设有筒体内凸筋， 筒体限位筋与筒体内凸筋之间的距离 环形限位片的厚度， 筒 体限位筋处的内径小于环形限位片的直径。
[0003] 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。
[0004] 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。
[0005] 综上所述， 仍然需要对现有回拉式注射器的芯杆结构和内针座与筒体之 间的锁定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， 同时达到简化加工工序， 降低制造成本的目的。
发明内容
[0006] 本发明的目的在于提供一种用于安全自毁式注射器的针座结构。 注射器 针座与注射器筒体之间通过弹性缓冲机构相互锁定，利用缓冲间隙的变形产生扩 张力， 实现两者的锁定和脱离效果， 该弹性缓冲机构可设置于内针座处， 亦可设 置于筒体内壁处， 同时， 针座和筒体处均形成可相互配合的弹性缓冲卡合机构， 其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针座内腔通过 卡合方式相互锁定， 并且， 当针座被回拉至注射器简体内后， 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，注射针因此会以近四十五角方向倒 向筒体内壁一侧， 并被筒体颈部锁定， 由此导致注射针及针座无法被再次推出筒 体颈部，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， 克服了现有技术中存在的缺点和不足。
[0007] 为了实现上述目的， 本发明的第--技术方案是： 一种用于安全自毁式注 射器的针座结构， 它包括针座本体， 其恃征在于： 所述针座本体下端与外套式回 拉锁定组件连接，所述针座本体上端装配有针管，针座本体的靠近中部形成弹性 密封限位部， 弹性密封限位部表面开设有环状缓冲间隙，环状缓冲间隙外侧的弹 性密封限位部外壁形成环状密封限位卡合部。
[0008] 本发明公开了一种用于安全自毁式注射器的针座结构， 与其配合的注射 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插入针座内腔， 并利用其弹性扩张的功能， 实现两 侧非对称卡合部与针座内腔的外套式回拉锁定组件卡合部卡合并锁定。由于外套 式回拉锁定组件内腔的环形凹槽设计也具有弹性缓冲特性，当与非对称回拉锁定 件在推进状态触及吋，两者都会产生相对的缓冲变形， 便于锁定件卡入外套式回 拉锁定组件内腔；在锁定件回抽时与外套式回拉锁定组件相互锁定。当针座被回 拉至注射器筒体内时， 在非对称作用力的受力环境下， 针座会受力向一侧偏转， 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。
附图说明 [0009] 图 1为本发明结构示意图。
[0010] 图 2为本发明外套式回拉锁定组件结构示意图。
[0011】 图 3为本发明使用状态图。
具体实施方式
[0012] 下面参照附图， 对本发明进一步进行描述。
[0013] 本发明为一种用于安全自毁式注射器的针座结构， 它包括针座本体， 其 区别于现有技术在于：所述针座本体下端与外套式回拉锁定组件 5连接，所述针 座本体上端装配有针管 1 , 针座本体的靠近中部形成弹性密封限位部 2， 弹性密 封限位部 2表面幵设有环状缓冲间隙 3， 环状缓冲间隙 3外侧的弹性密封限位部 2外壁形成环状密封限位卡合部 4， 弹性密封限位部使得内针座本体与筒体间既 能达到稳定卡合的要求， 又能实现轻便退出的效果。
[0014] 在具体实施时， 所述环状缓冲间隙 3 为环形槽结构， 其槽口至槽底的高 度为 0.05mm-4mm, 环状缓冲间隙 3的宽度为 0.05mm-4mm, 环状缓冲间隙 3外 侧槽壁与环状密封限位卡合部 4表面弧面弧顶的距离为 0.1mm-6mm, 环状缓冲 间隙 3外侧槽壁槽口处与环状密封限位卡合部 4外壁之间的距离为 0.1 mm-6mm， 环状缓冲间隙 3 外侧槽壁槽底处与环状密封限位卡合部 4 外壁之间的距离为 0.1mm-6mm, 环状密封限位卡合部 4 的表面成弧面状， 环状密封限位卡合部 4 表面弧顶至弧面上边缘的距离小于弧顶至弧面下边缘的距离，所述环状密封限位 卡合部 4下部的弹性密封限位部 2外壁处形成环状凹陷 6。
[0015] 在具体实施时， 所述环状凹陷 6与环状缓冲间隙 3的槽底位于同一水平 面或高于环状缓冲间隙 3的槽底。
[0016] 在具体实施时， 所述针座本体下端外壁处形成至少一环形限位凸筋 7 , 外 套式回拉锁定组件 5上端内腔的内壁处设有与环形限位凸筋 7相配合的环形限位 槽 8。
[0017] 在具体实施时， 所述外套式回拉锁定组件 5 内腔中空， 其内腔内壁靠近 下端开口处形成环状卡合锁定部 9。
[0018] 在具体实施时， 所述环状卡合锁定部 9的上部形成环形凹槽 10, 环形凹 槽 10内侧壁 11的厚度为 0.01mm-3mm ,环形凹槽 10内侧壁与环形凹槽 10外侧 壁 12之间形成 2度至 90度夹角， 环形凹槽 10内恻壁上端处形成的内直径为 lmm-80mm。
[0019] 在具体实施时， 所述环形凹槽 10的槽口宽度大于槽低宽度。
[0020] 以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明， 不能认定本发明具体实施只局限于上述这些说明。对于本发明所属技术领域的普 通技术人员来说，在不脱离本发明构思的前提下， 还可以做出若干简单推演或替 换， 都应当视为属于本发明的保护范围。

Claims

权 利 要 求 书
1. 一种用于安全自毁式注射器的针座结构， 它包括针座本体， 其特征在于： 所 述针座本体下端与外套式回拉锁定组件 (5) 连接， 所述针座本体上端装配有针 管 （1)， 针座本体的靠近中部形成弹性密封限位部 （2), 弹性密封限位部 （2) 表面开设有环状缓冲间隙 （3), 环状缓冲间隙 （3) 外侧的弹性密封限位部 （2) 外壁形成环状密封限位卡合部 （4)。
2. 根据权利要求 1所述的一种用于安全自毁式注射器的针座结构， 其特征在于 - 所述环状缓冲间隙 （3) 为环形槽结构， 其槽口至槽底的高度为 0.05mm-35mm， 环状缓冲间隙 （3) 的宽度为 0.05mm-30mm, 环状缓冲间隙 （3) 外侧槽壁与环 状密封限位卡合部（4)表面弧面弧顶的距离为 0.1mm-20mm,环状缓冲间隙（3) 外侧槽壁槽口处与环状密封限位卡合部 （4) 外壁之间的距离为 0.1mm-20mra, 环状缓冲间隙（3)外恻槽壁槽底处与环状密封限位卡合部（4)外壁之间的距离 为 O.lmm-20mm， 环状密封限位卡合部 （4) 的表 [¾'成弧面状， 环状密封限位卡 合部 （4) 表面弧顶至弧面上边缘的距离小于弧顶至弧面下边缘的距离， 所述环 状密封限位卡合部 （4) 下部的弹性密封限位部 （2) 外壁处形成环状凹陷 （6)。
3. 根据权利要求 2所述的一种用于安全自毁式注射器的针座结构， 其特征在于： 所述环状凹陷 （6)与环状缓冲间隙（3)的槽底位于同一水平面或高于环状缓冲 间隙 （3) 的槽底。
4. 根据权利要求 1所述的一种用于安全自毁式注射器的针座结构， 其特征在于： 所述针座本体下端外壁处形成至少一环形限位凸筋（7)，外套式回拉锁定组件 (5) 上端内腔的内壁处设有与环形限位凸筋 （7) 相配合的环形限位槽 （8)。
5. 根据权利要求 1所述的一种用于安全自毁式注射器的针座结构， 其特征在于 - 所述外套式回拉锬定组件 （5) 内腔中空， 其内腔内壁靠近下端幵口处形成环状 卡合锁定部 （9)。
6. 根据权利要求 5所述的一种用于安全自毀式注射器的针座结构， 其特征在于- 所述环状卡合锁定部（9)的上部形成环形凹槽（10),环形凹槽（10)内恻壁（11) 的厚度为 0.01mm-3nim， 环形凹槽 （10) 内侧壁与环形凹槽 （10) 外侧壁 （12) 之间形成 2 度至 90 度夹角， 环形凹槽 U0) 内侧壁上端处形成的内直径为 lmm-80mm。
7. 根据权利要求 6所述的一种用于安全自毁式注射器的针座结构， 其特征在于: 所述环形凹槽 （10 ) 的槽口宽度大于槽低宽度。
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