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WO2008019544A1 - Seringue améliorée à autodestruction - Google Patents

Seringue améliorée à autodestruction Download PDF

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Publication number
WO2008019544A1
WO2008019544A1 PCT/CN2007/000474 CN2007000474W WO2008019544A1 WO 2008019544 A1 WO2008019544 A1 WO 2008019544A1 CN 2007000474 W CN2007000474 W CN 2007000474W WO 2008019544 A1 WO2008019544 A1 WO 2008019544A1
Authority
WO
WIPO (PCT)
Prior art keywords
needle
push rod
improved self
coupling
card core
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2007/000474
Other languages
English (en)
French (fr)
Inventor
Zuoqian Lin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2008019544A1 publication Critical patent/WO2008019544A1/zh
Priority to EG2009010139A priority Critical patent/EG25719A/xx
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • A61M5/50—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
    • A61M5/5066—Means for preventing re-use by disconnection of piston and piston-rod
    • 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
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M2005/31516—Piston or piston-rod constructions, e.g. connection of piston with piston-rod reducing dead-space in the syringe barrel after delivery
    • 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
    • A61M5/5066—Means for preventing re-use by disconnection of piston and piston-rod
    • A61M2005/5073—Means for preventing re-use by disconnection of piston and piston-rod by breaking or rupturing the connection parts
    • 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
    • A61M5/3129—Syringe barrels
    • A61M5/3134—Syringe barrels characterised by constructional features of the distal end, i.e. end closest to the tip of the needle cannula
    • 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

Definitions

  • the present invention pertains to a medical device, and in particular to a disposable self-destructing syringe.
  • Syringes are an indispensable tool for medical treatment. In order to avoid cross-contamination of blood, today's syringes use disposable products, but such disposable syringes can be reused if they are not artificially destroyed. Existing disposable syringes have been re-used to cause cross-contamination, spread diseases, and many self-destructive disposable syringes have emerged.
  • a self-destructing syringe with a card core and a push rod structure is mainly composed of: a hollow needle tube, a push rod mounted in the needle tube, and a rubber plug mounted on the front end of the push rod, the needle tube
  • the front end is formed with a needle seat, a needle is mounted on the needle seat, and a convex ring is formed in the inner cavity of the needle seat;
  • a card core is disposed at the front end of the push rod, and the push rod and the card core are separated structures, and the card core is mounted on the push rod
  • the front end is symmetrically formed with two barbed protrusions on the surface thereof, and the protrusion can be inserted into the cavity at the front end of the convex ring, and the card core can block the inner cavity of the needle seat;
  • the card core When the pushing is completed, the card core will pass through the convex ring of the inner cavity of the needle seat into the cavity of the needle seat, and the protrusion will be caught on the outer side surface of the convex ring, thereby hindering the card core from moving backward. Separate the card core from the push rod, and finally force the push rod to break in the defect portion of the push rod to destroy the push rod and achieve self-destruction.
  • the above patent has the following disadvantages: Firstly, in the production of highly sophisticated medical equipment, the card core is small in size, complicated in structure, and difficult to open the mold; and the card core is separated from the push rod, and the processing process is complicated, thereby increasing the mold. Cost, secondly, the amount of liquid remaining after the injection is completed.
  • the technical problem to be solved by the present invention is: to provide an improved self-destructing syringe, which The syringe has a simple structure, the card core and the needle seat are conveniently and accurately assembled, the mold is easy to manufacture, and the assembly is more convenient.
  • An improved self-destructing syringe comprising a hollow needle, a push rod sliding in the needle and a rubber plug mounted on the front end of the push rod, the syringe
  • the front end is gradually reduced in diameter and formed with a coupling needle seat.
  • the coupling needle seat is connected with a needle holder equipped with an injection needle, and a card core is disposed at the front end of the push rod, and the card core can block the inner cavity of the coupling needle seat, and is characterized in that
  • the inner wall of the coupling hub is formed with an elastic pawl that gathers toward the center, and the card core is formed with a frustum that can be engaged with the elastic pawl.
  • the structure of the card core is simpler, the manufacture of the mold is simplified, the high precision during processing can be better satisfied, and the cost is saved.
  • the elasticity of the inner wall of the coupling needle seat is formed. The pawl allows the card core to be easily and accurately engaged with the core during the pushing process to achieve self-destruction.
  • the present invention employs the following further technical solution:
  • the elastic pawl is located at an intermediate portion of the coupling hub, and correspondingly the frustum is located at an intermediate portion of the card core.
  • the elastic pawl is injection molded integrally with the inner wall of the coupling hub. ⁇ With this structure, the needle can be molded in one shot, making the syringe easier to manufacture, easier to assemble, and more cost effective.
  • the push rod is provided with a plurality of break points. After the easy break point is set, when the push rod is pulled backwards after the injection, it can be broken or broken along the frangible point to achieve the purpose of complete self-destruction.
  • a lower portion of the push rod is provided with a thrust block, and correspondingly, a lower portion of the push rod is provided with the thrust block
  • the through hole, the thrust block and the inner wall of the through hole are integrally connected with the push rod by two easy break points, and the thrust block rotates along the end point. The installation of the thrust block prevents the syringe from self-destructing due to misoperation before transporting and pumping liquid.
  • Figure 1 is a cross-sectional view showing the unused state of the present invention
  • Figure 2 is a cross-sectional view showing the state before pushing liquid of the present invention
  • Figure 3 is a cross-sectional view showing the first step of pushing and self-destructing of the present invention
  • Figure 4 is a cross-sectional view showing the self-destruction of the present invention.
  • Figure 5 is a top view of the coupling hub
  • Figure 6. is a cross-sectional view of the needle
  • Figure 7 is a partial enlarged view of Figure 6;
  • Figure 8 is a schematic structural view of the push rod of the present invention.
  • Figure 9 is a view of the K direction of Figure 8.
  • Figure 10 is a schematic view of the structure of the handle
  • Figure 11 is a cross-sectional view taken along line D-D of Figure 10.
  • Figure 12 is a cross-sectional view taken along line ⁇ - ⁇ of Figure 10;
  • Figure 13 is a partial enlarged view of Figure 1. detailed description
  • the present invention comprises a hollow needle 1 , a push rod 2 sliding in the needle 1 and a rubber plug 3 mounted on the front end of the push rod 2, the front end of the needle 1 being gradually reduced in diameter and formed
  • the coupling needle seat 4 is connected to the needle holder 6 equipped with the injection needle 5, and here, the coupling needle holder 4 can be configured with a threaded head structure or a center head structure, taking into consideration the needle holder 6 and the coupling. Between the needle holders 4, relying solely on the static friction between the two to achieve the connection, it may fall off during use. To avoid this phenomenon, it is preferred. With the threaded head structure, the flange at the bottom of the needle holder 6 is threadedly engaged with the coupling needle seat 4, thereby achieving the purpose of fixing.
  • the inner wall of the coupling hub 4 is formed with elastic pawls 7 that are gathered toward the center, and at least two elastic pawls 7, in order to make the manufacture of the syringe simpler and reduce the cost, the elasticity
  • the pawl 7 is injection molded integrally with the inner wall of the coupling hub 4.
  • the push rod 2 has a card core at the front end, and the card core 8 can be injection molded with the push rod 2; the core 8 is formed with a frustum 9 which can be engaged with the elastic pawl 7.
  • the core 8 and the frustum 9 pass through the elastic pawl 7.
  • the elastic pawl 7 abuts against the lower end surface of the frustum 9 to make the card
  • the core 8 cannot be pumped back, and the core 8 can block the inner cavity of the coupling hub 4 to complete the first step of self-destruction.
  • the needle holder 6 In order not to cause the card core 8 to protrude from the coupling hub 4 and hit the needle holder 6, the needle holder 6 is detached.
  • the elastic pawl 7 is located at an intermediate portion of the coupling hub 4, and correspondingly the frustum 9 is located at an intermediate portion of the card core 8.
  • the length of the card core 8 is less than or equal to the length of the coupling hub 4, since the elastic pawl 7 is located at the coupling hub 4
  • the intermediate portion, the engagement with the card core 8, can be completed in the coupling hub 4.
  • the push rod 2 is provided with a plurality of break points. In this embodiment, three easy break points A, B, and C are provided. When the push rod 2 is pulled backwards after the injection is completed, the break point can be pulled along the frangible point. The push rod 2 can not be used again, and the purpose of complete self-destruction is achieved.
  • the lower part of the push rod 2 is provided with a handle 11
  • the handle 11 is provided with a thrust block 12
  • the handle 11 is provided with a through hole 13 for mounting the thrust block 12 .
  • the thrust block 12 and the inner wall of the through hole 13 are integrally connected with the handle 11 by two easy break points 14 and an end point 15, and the thrust block 12 is rotated along the end point 15, and the thrust block 12 can resist the bottom of the syringe 1 to prevent
  • the card core 8 is accidentally pushed into the elastic pawl 7 of the coupling hub 4 due to an erroneous operation before transporting and pumping the liquid, so that the syringe is self-destructed in advance.
  • the external force Before pushing the liquid, the external force The thrust block 12 is easily pushed, and the thrust block 12 is rotated along the end point 15 to break the upper frangible point, and the outer side wall of the thrust block 12 is embedded in the hole passage 13.
  • two protruding ribs 16 are provided between the inner wall of the through hole 13 and the two frangible points, and two corresponding protrusions 17 are provided on the thrust block 12.
  • the protrusion 17 is also embedded between the rib 16 and the thrust block 12, and the thrust block 12 is fixed in the through hole 13.
  • this process is a preparation operation before the liquid pushing, and the outer side wall of the thrust block 12 is inserted into the through hole 13.
  • the frustum 9 of the card core 8 passes through the elastic pawl 7 so that the elastic pawl 7 abuts against the frustum 9 so as to hinder the card core 8 from moving backward.
  • the card core 8 blocks the inner cavity of the coupling hub 4 and cannot be used again, completing the first step of self-destruction.
  • the push rod 2 is pulled hard, so that the head of the push rod 2 cannot be broken out in the needle 1 and the replacement push rod 2 and the rubber plug 3 are prevented from being used again. , to achieve complete self-destruction.

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

Description

一种改进的自毁式注射器
技术领域
本发明属于一种医疗器具，具体地属于一种一次性使用的自毁式 注射器。
背景技术
注射器是医疗上不可缺少的一项用具， 为避免血液交叉传染， 现在的注射器均釆用一次性用品， 但这种一次性注射器， 如果不人为 的进行毁坏， 是可以重复利用的， 为了不使现有一次性注射器被重复 利用而导致交叉感染， 传播疾病， 有许多自毁式一次性注射器便应运 而生。例如一种卡芯与推杆结构为分体式的自毁式注射器，主要包括： 一空心针管、一安装在所述针管内的推杆和一安装在所述推杆前端的 胶塞， 针管的前端成型有一针座， 针座上安装有一针头， 针座内腔成 型有一凸环； 所述推杆前端设置一卡芯， 推杆与卡芯为分体结构， 卡 芯安装在所述推杆的前端， 其表面上对称成型有两个倒刺状凸起， 该 凸起能够卡入所述凸环前端的凹腔内， 卡芯能够将所述针座内腔堵 塞； 卡芯的中部成型有一通孔， 通孔的位置与所述凸起对应。 当推液 完毕后， 卡芯就会穿过针座内腔的凸环进入针座的空腔内, 这时凸起 就会卡在凸环的外侧面上， 从而阻碍卡芯向后运动， 使卡芯和推杆分 离， 最后在推杆的缺损部用力将推杆折断， 破坏推杆， 达到自毁。 上 述专利存在如下缺点： 首先， 在生产高度精密的医疗器材中， 所述卡 芯体积小， 结构复杂， 模具难以开设； 并且卡芯与推杆分离， 加工工 艺随之复杂， 从而增加了模具的成本， 其次， 当注射完毕后液体的残 留量大。
发明内容
本发明要解决的技术问题是： 提供一种改进的自毁式注射器， 这 种注射器结构简单， 卡芯与针座卡合方便准确、 模具易于制作、 装配 更方便。
为了解决上述技术问题， 本发明釆用以下技术方案： 一种改进的 自毁式注射器，包括一空心针简、 一在针简内滑动的推杆和安装在推 杆前端的胶塞， 针筒的前端逐渐缩径并成型有一联接针座， 联接针座 与装有注射针的针头座相连接， 推杆前端设置一卡芯， 卡芯能够将所 述联接针座内腔堵塞， 其特征在于： 所述联接针座内壁成型有向中心 聚拢的弹性棘爪， 所述卡芯上成型有一可与弹性棘爪相卡合的锥台。
采用这种结构的注射器， 一方面卡芯的结构更为简单， 简化了模 具的制造， 能够更好的满足加工时的高度精密性， 节省了成本， 另一 方面， 联接针座内壁成型的弹性棘爪， 使卡芯在推液过程中方便准确 的与其卡合， 达到自毁目的。
为了解决上述技术问题， 本发明釆用以下进一步的技术方案： 所述弹性棘爪位于联接针座的中间部位，相应地锥台位于卡芯的 中间部位。 釆用这种结构， 由于弹性棘爪位于联接针座的中间部位， 其与卡芯的卡合， 可在联接针座内完成， 不会造成卡芯伸出联接针座 碰到针头座， 致使针头座脱落的现象。
所述的弹性棘爪与联接针座内壁注塑成一体。釆用这种结构后针 简可一次注塑成型， 使注射器的制作更加简单、 装配更方便， 同时更 节约成本。
所述的推杆上设有若干易断点。 设置了易断点后， 当注射完后， 推杆向后抽拔时， 能够沿所述易断点拉断或折断， 达到彻底自毁的目 的。
所述推杆的下部设有止推块，相应地推杆下部设有安装该止推块 的通孔， 止推块与通孔内壁用两易断点和一端点与推杆连为一体， 止 推块沿端点转动。 安装该止推块后， 可防止在运输和抽液体前因误操 作使注射器提前自毁。
附图说明
图 1、 为本发明未使用状态的剖视图；
图 2、 为本发明推液前状态的剖视图；
图 3、 为本发明推液完毕、 自毁第一步的剖视图；
图 4、 为本发明自毁完毕的剖视图；
图 5、 为联接针座的俯视图；
图 6、 为针简的剖视图；
图 7、 为图 6的局部放大图；
图 8、 为本发明推杆的结构示意图；
图 9、 为图 8的 K向视图；
图 10、 为拉手的结构示意图；
图 11、 为图 10的 D-D向剖视图；
图 12、 为图 10的 Ε-Ε·向剖视图；
图 13、 为图 1的局部放大图。 具体实施方式
参照图 1、 图 13, 本发明包括一空心针简 1、 一在针简 1内滑动 的推杆 2和安装在推杆 2前端的胶塞 3， 针简 1的前端逐渐缩径并成 型有一联接针座 4 , 联接针座 4与装有注射针 5的针头座 6相连接， 在这里， 联接针座 4可以釆用螺紋头结构， 也可以采用中心头结构， 考虑到针头座 6和联接针座 4 之间单单依靠两者间的静摩擦实现连 接， 在使用过程中有可能发生脱落， 为避免这种现象的发生， 优选釆 用螺紋头结构， 使针头座 6底部的凸缘与联接针座 4螺紋啮合， 以此 来达到固连的目的。
参见图 5、 图 6、 图 7 , 联接针座 4 内壁成型有向中心聚拢的弹 性棘爪 7 , 弹性棘爪 7 至少为两个， 为了使注射器的制作更加简单， 降低成本,所述的弹性棘爪 7与联接针座 4内壁注塑成一体。
参见图 8， 推杆 2前端有一卡芯 8， 卡芯 8可与推杆 2注塑成一 体； 卡芯 8上成型有一可与弹性棘爪 7相卡合的錐台 9。 当推杆 2向 前推进时，卡芯 8及锥台 9就穿过弹性棘爪 7 , 当推杆 2向后回抽时, 弹性棘爪 7就抵住锥台 9的下端面，使卡芯 8不能回抽，卡芯 8能够将 所述联接针座 4内腔堵塞， 完成自毁第一步。
为了不造成卡芯 8伸出联接针座 4碰到针头座 6 , 致使针头座 6 脱落的现象。 弹性棘爪 7位于联接针座 4的中间部位， 相应地锥台 9 位于卡芯 8 的中间部位，卡芯 8 的长度小于等于联接针座 4 的长度, 由于弹性棘爪 7位于联接针座 4的中间部位， 其与卡芯 8的卡合， 可 在联接针座 4内完成。
推杆 2上设有若干易断点， 本实施例设有三个易断点 A、 B、 C, 当注射完毕后推杆 2向后抽拔时， 能够沿所述易断点拉断， 从而使所 述推杆 2无法再次使用， 达到彻底自毁的目的。
参见图 9、 图 10、 图 11、 图 12 , 推杆 2的下部设有拉手 11 , 拉 手 11上设有一止推块 12 , 相应地拉手 11上设有安装该止推块 12的 通孔 13 , 止推块 12与通孔 13内壁用两易断点 14和一端点 15与拉 手 11连为一体， 止推块 12沿端点 15转动， 该止推块 12能抵住针筒 1底部， 防止在运输和抽液体前因误操作将所述卡芯 8误推入所述联 接针座 4的弹性棘爪 7内， 使注射器提前自毁。 当推液体前， 以外力 轻松推动所述止推块 12, 可将止推块 12沿端点 15转动， 使上部的 易断点断开， 所述止推块 12的外侧壁嵌入孔通 13内。 为了使嵌入孔 通 13内的止推块不会滑出来，通孔 13内壁与两易断点间设有两条突 起的筋条 16, 止推块 12上设有两个相对应的突起 17, 当止推块 12 的外侧壁嵌入孔通 13后， 该突起 17正好也嵌在筋条 16与止推块 12 之间， 将止推块 12固定在通孔 13内。 本发明在使用时， 首先， 如图 1所示 ， 注射器未被使用时， 卡 芯 8并没有穿过联接针座 4的弹性棘爪 7, 同时为防止误操作的止推 块 12抵住针简 1底部。
随后如图 2所示， 此过程为在推液前的准备动作， 此时止推块 12的外侧壁被嵌入通孔 13内。 如图 3所示， 此为推液完毕时， 所述 卡芯 8的锥台 9穿过所述弹性棘爪 7 , 使弹性棘爪 7抵住锥台 9 , 从 而阻碍卡芯 8向后运动， 卡芯 8将联接针座 4的内腔堵塞， 不能再次 使用， 完成自毁第一步。 如图 4所示， 此过程为自毁完毕时， 用力将 推杆 2拉断， 使推杆 2的头部， 断在针简 1内无法出来， 防止调换推 杆 2和胶塞 3再次使用， 达到彻底自毁。

Claims

1、 一种改进的自毁式注射器， 包括一空心针简（1)、 一在针简 （1) 内滑动的推杆（2)和安装在推杆（2)前端的胶塞 （3), 针简 （1) 的前端逐渐缩径并成型有一联接针座 （4)， 联接针座 （4) 与装有注 射针 （ 5 ) 的针头座 （ 6 )相连接， 推杆（ 2 )前端设置一卡芯 （ 8 ), 卡芯 （8) 能够将所述联接针座 （4) 内腔堵塞， 其特征在于：
A: 所述联接针座 （4) 内壁成型有向中心聚拢的弹性棘爪（7); B: 所述卡芯 （8)上成型有一可与弹性棘爪 （7)相卡合的锥台
(9)。
2、 如杈利要求 1所述的一种改进的自毁式注射器， 其特征在于： 弹 性棘爪 （7)位于联接针座（4)的中间部位， 相应地锥台（9)位于卡芯 (8)的中间部位。
3、 如权利要求 1或 2所述的一种改进的自毁式注射器， 其特征在于: 所述卡芯（8)的长度小于等于联接针座（4)的长度。
4、 如权利要求 1或 2所述的一种改进的自毁式注射器， 其特征在于: 所述的弹性棘爪（7)与联接针座（4)内壁注塑成一体。
5、 如杈利要求 1或 2所述的一种改进的自毁式注射器， 其特征在于: 所述的推杆 （2) 上设有若干易断点。
6、 如权利要求 1或 2所述的一种改进的自毁式注射器， 其特征在于: 所述的联接针座 （4)釆用螺紋头或中心头。
7、 如权利要求 1或 2所述的一种改进的自毁式注射器， 其特征在于: 所述联接针座 （4) 头部的弹性棘爪 （7) 数至少为两个。
8、 如权利要求 1或 2所述的一种改进的自毁式注射器， 其特征在于: 所述推杆 (2) 的下部设有拉手（11)， 拉手（11)上设有止推块（12), 相应地拉手（11)上设有安装该止推块（ 12 )的通孔（ 13 ),止推块（ 12 ) 与通孔（13 ) 内壁用两易断点 （14 )和一端点（15 )与拉手（11)连为 一体， 止推块（12)沿端点（15)转动。
9、 如权利要求 8所述的一种改进的自毁式注射器， 其特征在于： 所 述通孔 (13)内壁与两易断点 (14)间有突起的筋条（16) , 止推块（12) 上设有两个相对应的突起（17) 。
PCT/CN2007/000474 2006-08-07 2007-02-12 Seringue améliorée à autodestruction Ceased WO2008019544A1 (fr)

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CN101780297A (zh) * 2010-02-04 2010-07-21 温岭市千禧光医疗器械有限公司 一种定量自毁注射器
CN111068150A (zh) * 2020-01-15 2020-04-28 安徽宏宇五洲医疗器械股份有限公司 一种旋钮式护套、针头组件及注射器

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CN2770678Y (zh) * 2004-12-18 2006-04-12 徐亚华 锚状活塞针头回缩型安全注射器
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