WO2013127040A1 - 一种用于回拉式安全自毁式注射器的芯杆 - Google Patents

一种用于回拉式安全自毁式注射器的芯杆 Download PDF

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Publication number
WO2013127040A1
WO2013127040A1 PCT/CN2012/000932 CN2012000932W WO2013127040A1 WO 2013127040 A1 WO2013127040 A1 WO 2013127040A1 CN 2012000932 W CN2012000932 W CN 2012000932W WO 2013127040 A1 WO2013127040 A1 WO 2013127040A1
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WO
WIPO (PCT)
Prior art keywords
folding arm
pull
locking
syringe according
destructing syringe
Prior art date
Application number
PCT/CN2012/000932
Other languages
English (en)
French (fr)
Inventor
王祖扬
Original Assignee
Wang Zuyang
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wang Zuyang filed Critical Wang Zuyang
Publication of WO2013127040A1 publication Critical patent/WO2013127040A1/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
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • 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
    • A61M5/50—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 having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
    • 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 present invention relates to the technical field of medical devices, and more particularly to a core rod structure for a pullback type self-destructing syringe, and more particularly to a mechanical connection structure thereof.
  • the utility model comprises a cylinder body, a core rod is arranged in the cylinder body, a rubber plug is arranged near the end of the core rod, a needle is arranged in the cylinder neck of the cylinder body, and a needle tube is arranged at the needle head, wherein: the end of the core rod is The side wall of the rod body is provided with a lateral notch, the transverse notch is connected with the longitudinal notch at the end of the mandrel rod, the transverse notch is matched with the longitudinal notch, and the needle is sleeved by the upper needle seat and the lower needle seat, and the lower needle seat cavity is formed.
  • the lower needle seat has a cylindrical structure, and the lower needle seat is provided with a lower needle seat rib relative to the inner wall of the opening at the other end of the needle seat, and the end of the core rod is provided with elasticity formed by the transverse notch and the longitudinal notch.
  • the core rod body where the core rod body has a certain elasticity, wherein the longitudinal notch is narrow and wide, and the outer wall of the upper core rod of the lateral notch protrudes from the outer wall of the lower core rod, the transverse gap
  • the outer end of the core 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 greater than the diameter of the outer wall of the upper needle seat 0. 05mm - 0. 3mm
  • the lower needle seat is cylindrical
  • the inner cavity is hollow
  • the inner wall of the lower needle cavity is provided with a lower needle seat ring N2012/000932
  • the outer diameter of the outer cavity of the lower needle seat is fixed to be smaller than the outer diameter of the outer wall of the upper needle fixing ring 0. 1mm— 0. 35mm, the inner diameter of the lower cavity of the lower needle seat annular fixing groove is fixed on the outer diameter of the outer wall of the lower rod of the convex ring, and the lower needle seat is provided with the lower needle seat at the outer end of the outer end of the lower needle seat convex ring 5 ⁇ 1.
  • the distance between the upper end of the cylinder neck and the lower limit of the cylinder neck is 0. 3mm ⁇ 1. 5mm, the upper limit ring of the neck is protruded from the inner wall of the upper end ring of the cylinder neck and the lower limit ring of the cylinder neck. 0mm - 0.
  • the lower limit ring of the neck protrudes from the upper limit ring of the neck and the lower limit of the neck
  • the inner wall of the ring is 0. 02ram— 0. 25mra
  • the inner diameter of the inner cylinder of the upper cylinder of the upper end of the cylinder is the inner diameter of the inner cylinder of the cylinder neck upper limit ring and the lower limit ring of the cylinder neck
  • the upper limit ring of the cylinder neck and the neck of the cylinder The inner diameter of the inner cavity of the cylinder between the lower limit ring and the lower limit of the inner cylinder of the cylinder
  • the inner diameter of the inner cavity of the cylinder between the upper limit ring of the cylinder neck and the lower limit ring of the cylinder neck 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 inner wall of the other end of the cylinder neck
  • the cylinder limit rib can be a linear annular rib, an annular rib composed of a plurality of vertical ribs, a vertical rib, and a plurality of raised points, and the inner wall of the cylinder below the limit rib
  • the distance between the limiting rib of the cylinder and the rib in the cylinder is the thickness of the annular limiting piece
  • the inner diameter of the limiting rib of the cylinder is smaller than the diameter of the annular limiting piece.
  • the core rod includes a core rod body, the upper end portion of the core rod body is provided with a columnar fastener, and the columnar fastener is sleeved with a rubber plug, wherein: A mounting hole is arranged at the rubber plug, and a barb body is arranged in the mounting hole.
  • the function of retracting the needle by using the barb body is realized, and the safety injection is realized, and the general barb body is a metal piece or a plastic part.
  • 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 procedure and manufacturing cost, 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 and thus cause 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, posing a risk of secondary damage to the user.
  • the object of the present invention is to provide a core rod structure for a pull-back safety self-destructing syringe, wherein an end of the rod body is provided with an asymmetric locking member with an elastic function, and the locking member can pass the card with the inner cavity of the syringe needle seat.
  • the locking mode is locked to each other, and when the needle holder is pulled back into the syringe barrel, under the action of the asymmetric elastic structure, the needle seat will be deflected to one side by force, and the injection needle will be inverted in the direction of nearly forty-five degrees.
  • a core rod structure for a pull-back safety self-destructing syringe which comprises a rod body, and a rubber plug limit fitting portion is formed near the end portion of the rod body, and the rubber plug is limited.
  • a rubber plug is sleeved at the assembly portion, and the rod body is provided with an asymmetric elastic locking pullback member at the end.
  • the invention discloses a core rod structure for a pull-back safety self-destructing syringe, and an end of the core rod is provided with an asymmetric pull-back locking member with an elastic function.
  • the asymmetric structure is combined with the elastic function design to ensure that the locking member can be smoothly inserted into the inner cavity of the needle seat, and the elastic expansion force is utilized to realize the locking and locking of the asymmetrical engaging portion of the two sides and the inner wall of the needle seat inner cavity.
  • the asymmetric elastic pull-back locking member is a plastic barb body, and the plastic barb body adopts a design principle of asymmetry and an inelastic structure, and is designed with a specific angle and size.
  • the barb body has an elastic buffer locking function.
  • the asymmetric elastic pull-back locking member is integrated with the core rod, and the integral component is formed by one-time opening molding, which does not require separate processing or subsequent assembly, thereby effectively reducing manufacturing cost and simplifying
  • the assembly process reduces the assembly process.
  • the product is easy to operate and has stable working condition.
  • the asymmetric elastic pull-back piece at the end of the core rod and the inner cavity of the needle seat have excellent locking and locking effect.
  • the overall structure of the product is reasonable, the concept is clever, and it is easy to promote and apply. Compared with the existing products. Design and technology, there are significant technical breakthroughs in design, and N2012/000932
  • Figure 1 is a schematic view of the structure of the present invention.
  • FIG. 2 is a schematic view showing the structure of a plastic barb of the present invention.
  • Figure 3 is a plan view of Figure 2.
  • Figure 4 is a side view of Figure 2.
  • Figure 5 is a diagram showing the state of use of the present invention.
  • the invention relates to a core rod structure for a pull-back safety self-destructing syringe, which comprises a rod body 1.
  • the rod body 1 forms a rubber plug limit fitting portion 2 near the end portion, and the rubber plug limit fitting portion
  • the rubber plug 16 is sleeved at two places, which is different from the prior art in that: the end of the rod body 1 is provided with an asymmetric elastic locking pull-back member.
  • the asymmetric elastic locking pullback member has a center line of symmetry of the core rod, wherein each of the two sides of the shaft forms an engaging locking portion, and the engaging locking portions on both sides are asymmetric.
  • the snap locking portions on one or both sides have an elastic structure to ensure that the locking pullback member can smoothly enter the needle cavity and be tightly engaged with the lock.
  • the one side snap locking portion is higher or lower than the other side snap locking portion.
  • the width of the one side engagement locking portion is larger or smaller than the other side engagement locking portion, whereby the engagement locking portions on both sides are asymmetrically distributed.
  • the distance between the outer edge of the engaging locking portion of the one side and the symmetrical center line of the shaft is 1 - 20 mm.
  • the asymmetric elastic locking pullback member is a barb body 3, the barb body 3 is made of plastic material, and is integrated with the rod body 1 to form a single mold, the uniform performance of the material improves the overall stability of the core rod, and the integrated structure can reduce the manufacturing cost and improve the production and assembly efficiency.
  • the asymmetric elastic locking pullback member is a barb body 3, and the barb body 3 is made of a plastic material and is assembled with the shaft body 1 .
  • the lower end of the barb body forms a base portion 4, and the upper portion of the base portion 4 forms a first folding arm 5 that is deflected toward one side, and the outer side wall of the connection portion between the first folding arm 5 and the base portion 4 is formed.
  • a concave arc angle 8 or a chamfer angle of 45 degrees to 179 degrees the lower end of the first folding arm 5 is connected to the upper end of the base portion 4, and the upper end and the second end of the first folding arm 5
  • the folding arm 6 is connected at the end, and the other end of the second folding arm 6 is suspended.
  • the outer side of the joint of the first folding arm 5 and the second folding arm 6 forms a circular arc surface 7, and the first folding arm 5 and the second folding arm 6 are connected.
  • the inner side forms an inner angle 11 of 2 degrees and 90 degrees
  • the width of the opening between the floating end of the second folding arm 6 and the first folding arm 5 is 0.5 mm - 40 mm, which ensures the first folding arm and the first
  • the elastic deformation function is formed between the two folding arms, and the barb body slides into the inner cavity of the needle seat by the elastic change of the angle between the first folding arm and the second folding arm, and is under the action of the resetting force and the needle seat.
  • the inner cavity is tightly locked and locked.
  • the length of the first folding arm 5 is 0.5 mm - 50 mm
  • the length of the second folding arm 6 is 0.5 mm - 60 mm.
  • the hanging end of the second folding arm 6 forms a thorn tip 15, and the hanging end of the second folding arm 6 protrudes from the outer edge of the base portion 4.
  • the ribs 12 are formed with four cross-shaped ribs 12 at the outer corners of the ribs 12.
  • the ribs 13 are provided at the outer edges of the ribs 12.
  • the limiting flaps 13 are connected to the reinforcing ribs 12 by at least two contacts 14.

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

Abstract

一种用于回拉式安全自毁式注射器的芯杆，包括杆体（1），所述杆体（1）端部设有非对称弹性锁定回拉件，该回拉件以芯杆的对称中心线为中轴，其中轴的两侧各形成一个卡合锁定部，且两侧的卡合锁定部呈非对称状。一侧或两侧的卡合锁定部具有弹性，从而确保所述回拉件能顺利进入针座内腔并与针座内腔卡合部卡合锁定，当针座被拉回至注射器筒体内后，在非对称作用力的影响下，针座向一侧自动偏转，使得注射针倒向筒体内壁一侧，被筒体颈部锁定，从而有效防止针头在使用后再次被推出筒体而造成的二次损伤或交叉感染。

Description

说 明 书 一种用于回拉式安全自毁式注射器的芯杆 技术领域
本发明涉及医疗器械的技术领域，具体的说是一种用于回拉式安 全自毁式注射器的芯杆结构， 特别涉及其机械连接结构。
背景技术
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，下针座相对于安装上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， 横向缺口可为外高内低状， 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 N2012/000932
2
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. 1mm— 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. 5mra, 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. lmm— 0. 6mm， 筒颈下限位环凸出于筒颈上限 位环和筒颈下限位环之间内壁 0. 02ram— 0. 25mra， 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，筒颈上限位环和筒颈下限位环之间筒体内腔的内径 筒颈下限位 环下部筒体内腔的内径，筒颈上限位环和筒颈下限位环之间筒体内腔 的内径小于下针头座环形凸筋外径 0. 1mm— 0. 5腿， 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。
对比文件二，专利号： ZL200720067715. 4, 申请日： 2007. 03. 08, 公告号： CN201076648, 专利权人： 上海顶尖堂生化科技有限公司， 本案公开了 "一种带有金属钩件结构的芯杆"， 包括芯杆体， 芯杆体 的上端部设有柱状扣件， 柱状扣件处套接有胶塞， 其特征在于： 所述 胶塞处设有安装孔， 安装孔内设有倒钩体。
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 在缺陷或不完善的地方并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。
综上所述，仍然需要对现有倒钩回拉式注射器的芯杆结构进行进 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
本发明的目的在于提供一种用于回拉式安全自毁式注射器的芯 杆结构， 其杆体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 器筒体内后， 在非对称弹性结构的作用下， 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。 为了实现上述目的，本发明的技术方案是： 一种用于回拉式安全 自毁式注射器的芯杆结构，它包括杆体，杆体靠近端部处形成胶塞限 位装配部， 胶塞限位装配部处套接有胶塞， 其特征在于： 所述杆体端 部设有非对称弹性锁定回拉件。
本发明公开了一种用于回拉式安全自毁式注射器的芯杆结 构， 该芯杆的端部设有带弹性功能的非对称回拉锁定件。用非对 称结构配合弹性功能设计， 确保该锁定件能顺利插入针座内腔， 并利用弹性扩张力的作用，实现两侧非对称卡合部与针座内腔内 壁卡合部卡合并锁定。当针座被回拉至注射器筒体内后， 在非对 称作用力的受力环境下， 针座会自动向一侧形成偏转， 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，有效防止针头被推出造 成的二次损伤， 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， 另 外， 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。 产品使用操作简单， 工 作状态稳定，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， 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 N2012/000932
5 具有突出的安全性和实用性特点。
附图说明
图 1为本发明结构示意图。
图 2为本发明塑料倒钩体结构示意图。
图 3为图 2俯视图。
图 4为图 2侧视图。
图 5为本发明使用状态图。
具体实施方式
下面参照附图， 对本发明进一步进行描述。
本发明为一种用于回拉式安全自毁式注射器的芯杆结构，它包括 杆体 1， 杆体 1靠近端部处形成胶塞限位装配部 2， 胶塞限位装配部
2处套接有胶塞 16， 其区别于现有技术在于： 所述杆体 1端部设有非 对称弹性锁定回拉件。该非对称弹性锁定回拉件以芯杆的对称中心线 为中轴， 其中轴的两侧各形成一卡合锁定部， 且两侧的卡合锁定部呈 非对称状。 同时， 一侧或两侧的卡合锁定部具有弹性结构， 以确保该 锁定回拉件能顺利进入针头内腔， 并与之紧密卡合锁定。
在具体实施时，所述一侧卡合锁定部高于或低于另一侧卡合锁定 部。所述一侧卡合锁定部的宽度大于或小于另一侧卡合锁定部，由此， 两侧的卡合锁定部呈非对称状分布。
在具体实施时，所述一侧的卡合锁定部外侧边缘与杆体的对称中 心线之间的距离为 1讓 - 20mm。
在本发明具体实施例中，所述非对称弹性锁定回拉件为一倒钩体 3， 所述倒钩体 3为塑料材质， 且与杆体 1成一体结构， 一次开模成 型， 材料的统一性能提升芯杆的整体稳定性能， 一体式结构能降低制 造成本， 提高生产和装配效率。
在本发明具体另一实施例中，所述非对称弹性锁定回拉件为一倒 钩体 3， 所述倒钩体 3为塑料材质， 且与杆体 1成分体式装配结构。
在具体实施时， 所述倒钩体下端形成基座部 4， 基座部 4上部形 成向一侧偏转的第一折臂 5， 第一折臂 5与基座部 4的连接处外侧壁 形成内凹状的圆弧角 8或折角，该圆弧角 8的弧度为 45度至 179度， 第一折臂 5的下端与基座部 4的上端连接，第一折臂 5的上端与第二 折臂 6—端连接， 第二折臂 6另一端悬空， 第一折臂 5与第二折臂 6 连接处的外侧形成圆弧面 7， 第一折臂 5与第二折臂 6连接处的内侧 形成 2度一 90度的内夹角 11， 第二折臂 6的悬空端与第一折臂 5之 间形成开口的宽度为 0.5mm— 40mm， 该宽度能确保第一折臂与第二 折臂之间形成弹性伸缩性能，倒钩体就是借助第一折臂与第二折臂之 间夹角的弹性变化顺势滑入针座内腔，并在复位扩张力的作用下与针 座内腔紧密卡合锁定。 所述第一折臂 5的长度为 0.5mm— 50mm， 所 述第二折臂 6的长度为 0.5mm— 60mm。 所述第二折臂 6的悬空端形 成刺尖 15， 且第二折臂 6的悬空端突出于基座部 4外侧边缘。
在具体实施时，所述杆体 1处形成四片十字形等夹角分布的加强 筋 12， 加强筋 12外边缘处设有限位折片 13。 所述限位折片 13与加 强筋 12之间通过至少两个触点 14连接。
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
1.一种用于回拉式安全自毁式注射器的芯杆结构， 它包括杆体 ( 1 )， 杆体 （1 ) 靠近端部处形成胶塞限位装配部 （2)， 胶塞限位装 配部 （2) 处套接有胶塞 （16)， 其特征在于： 所述杆体 （1 ) 端部设 有非对称弹性锁定回拉件。
2.根据权利要求 1 所述的一种用于回拉式安全自毁式注射器的 芯杆结构， 其特征在于：所述非对称弹性锁定回拉件以芯杆的对称中 心线为中轴， 其中轴的两侧各形成一卡合锁定部， 且两侧的卡合锁定 部呈非对称状。
3.根据权利要求 2 所述的一种用于回拉式安全自毁式注射器的 芯杆结构， 其特征在于： 所述一侧卡合锁定部高于或低于另一侧卡合 锁定部。
4.根据权利要求 2 所述的一种用于回拉式安全自毁式注射器的 芯杆结构， 其特征在于： 所述一侧卡合锁定部的宽度大于或小于另一 侧卡合锁定部。
5.根据权利要求 2 所述的一种用于回拉式安全自毁式注射器的 芯杆结构，其特征在于：所述一侧或两侧的卡合锁定部具有弹性结构。
6.根据权利要求 1 所述的一种用于回拉式安全自毁式注射器的 芯杆结构， 其特征在于： 所述一侧的卡合锁定部外侧边缘与杆体的对 称中心线之间的距离为 1mm- 20mm。
7.根据权利要求 1 所述的一种用于回拉式安全自毁式注射器的 芯杆结构，其特征在于：所述非对称弹性锁定回拉件为一倒钩体（3)， 所述倒钩体（3 ) 为塑料材质， 且与杆体（1 )成一体结构， 一次开模 成型。
8.根据权利要求 1 所述的一种用于回拉式安全自毁式注射器的 芯杆结构， 其特征在于： 所述非对称弹性锁定回拉件为一倒钩体， 所 述倒钩体为塑料材质， 且与杆体 （1 ) 成分体式装配结构。
9.根据权利要求 7 所述的一种用于回拉式安全自毁式注射器的 芯杆结构， 其特征在于： 所述倒钩体下端形成基座部 （4)。
10.根据权利要求 9所述的一种用于回拉式安全自毁式注射器的 芯杆结构， 其特征在于： 所述基座部 （4) 上部形成向一侧偏转的第 一折臂 （5)， 第一折臂 （5 )与基座部（4) 的连接处外侧壁形成内凹 状的圆弧角 （8)或折角， 该圆弧角 8的弧度为 45度至 179度， 第一 折臂 （5) 的下端与基座部 （4) 的上端连接， 第一折臂 （5) 的上端 与第二折臂（6)—端连接，第二折臂（6)另一端悬空，第一折臂（5) 与第二折臂 （6)连接处的外侧形成圆弧面（7)， 第一折臂 （5 )与第 二折臂 （6) 连接处的内侧形成 2度至 90度的内夹角 （11 )， 第二折 臂 （6) 的悬空端与第一折臂 （5 ) 之间形成开口的宽度为 0.5mm— 40mm o
11.根据权利要求 10 所述的一种用于回拉式安全自毁式注射器 的芯杆结构，其特征在于:所述第一折臂 (5)的长度为 0.5mm— 50mm。
12.根据权利要求 10 所述的一种用于回拉式安全自毁式注射器 的芯杆结构，其特征在于:所述第二折臂（6)的长度为 0.5mm— 60mm。
13.根据权利要求 1所述的一种用于回拉式安全自毁式注射器的 芯杆结构， 其特征在于： 所述杆体 （1 ) 处形成四片十字形等夹角分 布的加强筋 （12)， 加强筋 （12) 外边缘处设有限位折片 （13 )。
14.根据权利要求 13 所述的一种用于回拉式安全自毁式注射器 的芯杆结构， 其特征在于： 所述限位折片 （13 ) 与加强筋（12)之间 通过至少两个触点 （14) 连接。
15.根据权利要求 10 所述的一种用于回拉式安全自毁式注射器 的芯杆结构，其特征在于：所述第二折臂（6)的悬空端形成刺尖（15)。
16.根据权利要求 10 所述的一种用于回拉式安全自毁式注射器 的芯杆结构， 其特征在于： 所述第二折臂 （6) 的悬空端突出于基座 部 （4) 外侧边缘。
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