WO2018133812A1 - 一种复合式安全自毁注射器 - Google Patents

一种复合式安全自毁注射器 Download PDF

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Publication number
WO2018133812A1
WO2018133812A1 PCT/CN2018/073180 CN2018073180W WO2018133812A1 WO 2018133812 A1 WO2018133812 A1 WO 2018133812A1 CN 2018073180 W CN2018073180 W CN 2018073180W WO 2018133812 A1 WO2018133812 A1 WO 2018133812A1
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syringe
section
wall
needle seat
sealing ring
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PCT/CN2018/073180
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English (en)
French (fr)
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黄旭荣
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黄旭荣
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Publication of WO2018133812A1 publication Critical patent/WO2018133812A1/zh

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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
    • A61M5/50—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
    • 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 a syringe, and in particular to a composite safe self-destructing syringe.
  • Self-destructing syringes are disposable syringe products that can be reused after use. After the injection is completed, relying on manual or mechanical force, the push rod cannot be pulled out from the syringe, the self-locking is achieved, or the sealing performance of the piston is destroyed, or the plunger of the syringe can be inferred, and finally the purpose of preventing reuse is achieved. .
  • the syringe's self-destruct function is triggered, which makes the syringe unusable.
  • the user uses this type of syringe to inject the medicine into the patient, it is also easy to operate.
  • the process triggers the self-destruct function of the syringe, causing the needle tube to be accidentally pulled out directly in the patient's body, which may cause a medical accident.
  • a composite safe self-destructing syringe including
  • the bottom wall of the syringe is radially retracted to form a first bayonet
  • the injection rod the injection rod is movably engaged in the injection barrel, and the lower end of the injection rod is tightly fitted with the inner wall of the injection tube, the inside of the injection rod is a cavity, and the bottom wall of the injection rod is radially retracted to form a second bayonet, the injection rod
  • a spring sleeve movable upwardly relative to the injection rod is mounted under the cavity, the outer wall of the spring sleeve is provided with a first stop bump, and the inner wall of the second bayonet is provided with a first recess that is engaged with the first stop bump
  • the groove has an abutting portion below the inner wall of the injection rod, and a compression spring is arranged between the top of the spring sleeve and the abutting portion, and the compression spring is used to provide a spring stress for pushing the spring sleeve away from the abutting portion, and the lower end portion of the spring sleeve is fixedly disposed.
  • the sealing ring is placed at the bottom end of the injection cylinder, and is tightly fitted with the inner wall of the injection cylinder, and a through hole is arranged in the middle of the sealing ring;
  • the needle seat and the needle seat are divided into a first section, a second section and a third section from top to bottom, and the diameters of the first section, the second section and the third section of the needle seat are sequentially decreased;
  • the needle seat is a cavity
  • the first section of the needle seat is inserted into the through hole of the sealing ring and closely cooperates with the sealing ring, and the first section of the needle seat is coupled with the sealing ring to form a buffer cavity, and the first section of the needle seat is provided with a card joint
  • the card slot of the card, the lower end of the first section of the needle seat is radially retracted and the second section of the needle seat forms a first step surface; the lower end of the second section of the needle seat is radially retracted and the third section of the needle seat forms a second step surface
  • the third section of the needle seat is tightly inserted into the first bayonet of the syringe, and the second step surface cooperates with the upper end surface of the first bayonet of the s
  • the sealing ring is a rubber block, and the upper and lower ends of the sealing ring are provided with a bearing curved surface which is deformed when being pressed.
  • the bottom end of the injection rod is provided with a rubber sealing plug for pressing the sealing ring, and the rubber sealing plug is tightly fitted with the inner wall of the syringe.
  • the outer wall of the sealing ring is provided with a second stopping protrusion
  • the inner wall of the injection cylinder is provided with a second groove that is engaged with the second stopping protrusion
  • the upper end of the injection rod is provided with a back cover, and the back cover is engaged with the injection rod.
  • the upper end of the injection rod is provided with a convex convex edge
  • the upper end of the inner wall of the injection cylinder is provided with a snap portion matching the convex edge
  • the lower end of the syringe is sleeved with a sheath that is snapped onto the outer wall of the syringe.
  • the invention ensures the safety of the syringe in use by providing a pneumatic and spring-type retracting structure in the syringe.
  • the syringe is provided with a pneumatic and spring-type retracting structure, and a buffer cavity is arranged in the syringe, when needed
  • the self-destruct function is not triggered when the injection rod is pushed to the zero position, so that the injection rod can be repeatedly pushed to the zero position to safely dispense the medicine, and the stop bump is set, and the user can clear the syringe. Operational feedback to avoid medical accidents caused by misuse.
  • Figure 1 is a schematic view of the structure of the present invention
  • Figure 2 is a schematic view of the state of use of the present invention.
  • Figure 3 is a second schematic view of the state of use of the present invention.
  • Figure 4 is a schematic view of the self-destruction of the present invention.
  • Figure 5 is a schematic structural view of a seal ring of the present invention.
  • Figure 6 is a schematic view showing the structure of the hub of the present invention.
  • the embodiment provides a composite safety self-destructing syringe, including
  • the syringe 1, the bottom wall of the syringe 1 is radially retracted to form a first bayonet 11;
  • the injection rod 2 is movably engaged in the syringe 1 , and the lower end of the injection rod 2 is tightly fitted with the inner wall of the syringe 1 , the inside of the injection rod 2 is a cavity, and the bottom wall of the injection rod 2 is radially retracted.
  • the second bayonet 21 is provided with a spring sleeve 22 movable upwardly relative to the injection rod 2 below the cavity of the injection rod 2.
  • the outer wall of the spring sleeve 22 is provided with a first stop bump 221, and the inner wall of the second bayonet 21 is disposed.
  • the first groove 211 is engaged with the first stopping protrusion 221, and the bottom of the inner wall of the injection rod 2 is provided with an abutting portion 23, and a compression spring 24 is disposed between the top of the spring sleeve 22 and the abutting portion 23, and the compression spring 24 is provided.
  • the lower end portion of the spring sleeve 22 is fixedly provided with a card joint 222;
  • Sealing ring 3 sealing ring 3 the bottom end of the injection cylinder, and sealingly cooperate with the inner wall of the syringe 1, the central portion of the sealing ring 3 is provided with a through hole 31;
  • the needle seat 4, the needle seat 4 is divided into a first segment, a second segment and a third segment from top to bottom, and the diameters of the first segment, the second segment and the third segment of the hub 4 are sequentially decreased;
  • the first section of the needle hub 4 is inserted into the through hole 31 of the sealing ring 3 and closely cooperates with the sealing ring 3, and the first section of the needle seat 4 is coupled with the sealing ring 3 to form a buffer cavity 41, and the needle seat 3 a slot 42 for engaging with the card connector 222 is disposed in the first cavity, the lower end of the first section of the needle seat 4 is radially retracted and the second section of the needle seat forms a first step surface 43; the second section of the needle seat 4 The lower end is radially retracted and the third section of the needle hub 4 forms a second stepped surface 44.
  • the third section of the needle hub 4 is tightly inserted into the first bayonet 11 of the syringe 1, and the second stepped surface 44 and the syringe 1 are The upper end surface of the first bayonet 11 cooperates to form a limiting structure for preventing the needle holder 4 from moving downward; the cavity of the third section of the needle holder 4 is fixedly provided with a needle 45, and the needle 45 is passed downwardly from the needle holder 4 through the syringe 1
  • the first bayonet 11 extends to the outside of the syringe 1.
  • the medicine needs to be injected into the patient body, and after the injection rod 2 is pushed to the zero position, the spring sleeve 22 is
  • the upper card connector is also in the buffer cavity of the needle holder 4, does not trigger the self-destruct function, guarantees the safety during the injection, and avoids medical accidents.
  • the second stop bump 33 on the seal ring 3 is disengaged from the second groove 13 and moves downward together with the injection rod 2, and the compressed air pair generated by the gap between the seal ring 3 and the syringe 1
  • a stepped surface 43 produces an increasing elastic stress pushing the needle hub 4 upward until the card joint 222 passes through the buffer cavity 41 and engages with the card slot 42 on the needle hub 4; the injection rod 2 continues to be pushed down,
  • the first stopping protrusion 221 on the spring sleeve 22 is disengaged from the first groove 13 , and the elastic spring of the compression spring 24 adds the elastic stress of the compressed air to the needle seat 4 to the spring sleeve 22 and the needle.
  • the seat 4 is retracted into the cavity of the injection rod 2 together, and the compression spring 24 is extended to press the top end of the spring sleeve 22 in the cavity of the injection rod 2, thereby ensuring that the needle 45 does not fall back to expose the injection rod 2, thereby Composite syringe assembly structure, when the user operates the syringe to perform injection and self-destruction.
  • the sealing ring 3 is a rubber block, and the upper and lower ends of the sealing ring 3 are provided with a pressure-receiving curved surface 32 which is deformed when pressed, so that the sealing ring 3 is more easily deformed when pressed.
  • the bottom end of the injection rod 2 is provided with a rubber sealing plug 25 for pressing the sealing ring 3, and the rubber sealing plug 25 is hermetically fitted to the inner wall of the syringe to further improve the sealing property.
  • the outer wall of the sealing ring 3 is provided with a second stopping protrusion 33.
  • the inner wall of the injection cylinder 1 is provided with a second groove 13 which is engaged with the second stopping protrusion 33 to ensure a reliable structure.
  • the upper end of the injection rod is provided with a rear cover 26, and the rear cover 26 is engaged with the injection rod 2 to prevent the spring sleeve 22 from flying out of the injection rod after the self-destruction function is realized.
  • the upper end of the injection rod 2 is provided with a convex convex edge 27, and the upper end of the inner wall of the injection cylinder 1 is provided with a locking portion 12 matching the convex edge 27, and when the self-destruction is achieved, the convex edge 27 of the injection rod 2 is stuck. It is attached to the engaging portion 12, thereby preventing the injection rod 2 from being pulled out of the syringe 1, further preventing the syringe from being reused.
  • the lower end of the syringe 1 is also sleeved with a sheath 5 which is snapped onto the outer wall of the syringe 1 to make the syringe safer.

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Abstract

一种复合式安全自毁注射器，包括注射筒（1）、注射杆（2）、密封环（3）、针座（4）；注射筒（1）的底壁径向内缩形成第一卡口（11）；注射杆（2）活动地穿接在注射筒（1）内，且注射杆（2）下端部与注射筒（1）内壁密闭配合，注射杆（2）内为空腔，注射杆（2）的底壁径向内缩形成第二卡口（21），注射杆（2）空腔下方安装有可相对注射杆（2）向上运动的弹簧套（22），弹簧套（22）的下端部固定设有卡接头（222）；密封环（3）置于注射筒（1）底端，且与注射筒（1）内壁密闭配合，密封环（3）中部设有通孔（31）；针座（4）由上至下分为直径依次减小的第一段、第二段、第三段；针座（4）空腔内固定设有针头（45）。复合式安全自毁注射器能够实现注射器的复合式安全自毁，保障使用过程的安全性，避免发生医疗事故。

Description

一种复合式安全自毁注射器 技术领域
本发明涉及注射器，具体涉及一种复合式安全自毁注射器。
背景技术
随着注射器的广泛应用，为避免出现医疗病患的交叉感染，越来越多的自毁式注射器出现在市面上，自毁式注射器是使用后能防止重复使用的一次性注射器产品，种类多样，在注射完毕后，依赖手工或机械力量，使推杆不能从针筒内抽出，达到自锁，或者活塞的密封性能被破坏，或者注射器的推杆能被推断，最终达到防止重复利用的目的。
目前市面上也存在多种回缩自毁注射器，这种注射器通过设置特定的组装结构，使针管在注射完成能能够回缩到注射器内，实现自毁功能，但这类型回缩自毁注射器的安全性能制约着这种产品的广泛推广，使用者使用注射器时通常需要多次抽取药水进行配药，因为需要保证注射器内的空气完全排出，所以必须把注射杆推动到注射器的零位，而这个操作容易出现安全问题，注射杆推动到零位时触发了注射器的自毁功能，导致注射器无法使用，而另一方面，当使用者使用这类型注射器给病人注射药剂时，也容易操作失误，在注射的过程中触发了注射器的自毁功能，导致针管直接在病人体内意外拔出，有可能造成医疗事故。
发明内容
为了克服现有技术的不足，本发明的目的在于提供一种复合式安全自毁注射器，能够实现注射器的安全自毁。
为解决上述问题，本发明所采用的技术方案如下：
一种复合式安全自毁注射器，包括，
注射筒，注射筒的底壁径向内缩形成第一卡口；
注射杆，注射杆活动的穿接在注射筒内，且注射杆下端部与注射筒内壁密闭配合，注射杆内为空腔，注射杆的底壁径向内缩形成第二卡口，注射杆空腔下方安装有可相对注射杆向上运动的弹簧套，弹簧套的外壁设有第一止动凸点，第二卡口的内壁上设有与第一止动凸点卡接的第一凹槽，注射杆的内壁下方设有抵触部，弹簧套的顶部与抵触部之间设有压缩弹簧，压缩弹簧用于提供一个推动弹簧套远离抵触部的弹性应力，弹簧套的下端部固定设有卡接头；
密封环，密封环置于注射筒底端，且与注射筒内壁密闭配合，密封环中部设有通孔；
针座，针座由上至下分为第一段，第二段，第三段，且针座第一段，第二段，第三段的直径依次减小；针座内为空腔，针座第一段穿接在密封环的通孔内且与密封环紧密配合，针座第一段与密封环连接配合形成缓冲空腔，针座第一段空腔内设有用于与卡接头卡接的卡槽，针座第一段下端径向内缩与针座第二段形成第一台阶面；针座第二段下端径向内缩与针座第三段形成第二台阶面，针座第三段密闭的插装在注射筒第一卡口内，且第二台阶面与注射筒第一卡口上端面配合以形成防止针座向下移动的限位结构；针座第三段的空腔内固定设有针头，针头由针座向下通过注射筒第一卡口延伸至注射筒的外部。
优选的，密封环为橡胶块，密封环上下端均设有受到挤压时发生形变的承压曲面。
优选的，注射杆底端设置有用于挤压密封环的橡胶密封塞，该橡胶密封塞与注射筒内壁密闭配合。
优选的，密封环的外壁设有第二止动凸点，注射筒的内壁上设有与第二止动凸点卡接的第二凹槽。
优选的，注射杆上端设有后盖，后盖与注射杆卡接。
优选的，注射杆的上端设有外凸的凸沿，注射筒内壁上端设有与凸沿相匹配的卡接部。
优选的，注射筒下端还套设有护套，护套卡接在注射筒的外壁上。
相比现有技术，本发明的有益效果在于：
本发明通过在注射器设有气压式和弹簧式的回缩结构，保障注射器在使用时的安全性，注射器设有气压式和弹簧式的回缩结构，并在注射器内设置缓冲空腔，当需要使用注射器进行配药时，注射杆推送至零位时不会触发自毁功能，使注射杆能够反复推送至零位从而安全地进行配药，同时设置了止动凸点，使用者操作注射器能有清晰的操作反馈，避免了出现误操作导致医疗事故。
下面结合附图和具体实施方式对本发明作进一步详细说明。
附图说明
图1为本发明的结构示意图；
图2为本发明使用状态示意图之一；
图3为本发明使用状态示意图之二；
图4为本发明自毁后示意图；
图5为本发明密封环结构示意图；
图6为本发明针座结构示意图。
附图标记：1、注射筒；11、第一卡口；12、卡接部；13、第二凹槽；2、注射杆；21、第二卡口；211、第一凹槽；22、弹簧套；221、第一止动凸点；222、卡接头；23、抵触部；24、压缩弹簧；25、橡胶密封塞；26、后盖；27、凸沿；3、密封环；31、通孔；32、承压曲面；33、第二止动凸点；4、针座； 41、缓冲空腔；42、卡槽；43、第一台阶面；44、第二台阶面；45、针头；5、护套。
具体实施方式
如图1-6所示的，本实施例提供一种复合式安全自毁注射器，包括，
注射筒1，注射筒1的底壁径向内缩形成第一卡口11；
注射杆2，注射杆2活动的穿接在注射筒1内，且注射杆2下端部与注射筒1内壁密闭配合，注射杆2内为空腔，注射杆2的底壁径向内缩形成第二卡口21，注射杆2空腔下方安装有可相对注射杆2向上运动的弹簧套22，弹簧套22的外壁设有第一止动凸点221，第二卡口21的内壁上设有与第一止动凸点221卡接的第一凹槽211，注射杆2的内壁下方设有抵触部23，弹簧套22的顶部与抵触部23之间设有压缩弹簧24，压缩弹簧24用于提供一个推动弹簧套22远离抵触部23的弹性应力，弹簧套22的下端部固定设有卡接头222；
密封环3，密封环3注射筒底端，且与注射筒1内壁密闭配合，密封环3中部设有通孔31；
针座4，针座4由上至下分为第一段，第二段，第三段，且针座4第一段，第二段，第三段的直径依次减小；针座4内为空腔，针座4第一段穿接在密封环3的通孔31内且与密封环3紧密配合，针座4第一段与密封环3连接配合形成缓冲空腔41，针座3第一段空腔内设有用于与卡接头222卡接的卡槽42，针座4第一段下端径向内缩与针座第二段形成第一台阶面43；针座4第二段下端径向内缩与针座4第三段形成第二台阶面44，针座4第三段密闭的插装在注射筒1第一卡口11内，且第二台阶面44与注射筒1第一卡口11上端面配合以形成防止针座4向下移动的限位结构；针座4第三段的空腔内固定设有针头45，针头45由针座4向下通过注射筒1第一卡口11延伸至注射筒1的外部。
当需要使用注射器进行配药时，如图1、2所示，使用者把注射杆2推送至零位，此时弹簧套22的卡接头222处于针座4的缓冲空腔41内，并不会与针座4上的卡槽42卡接，避免触发自毁功能，实现安全地进行配药，同时，配药完成后，需要把药剂注射到病人体内，注射杆2推送至零位后，弹簧套22上的卡接头也是处于针座4的缓冲空腔内，不会触发自毁功能，保障实施注射时的安全性，避免医疗事故。
当注射完成把注射器拔出人体外后，需要实现注射器自毁，如图3、4所示，把注射器的注射杆2从零位继续往下推送，注射杆2的下端部挤压密封环3，使密封环3上的第二止动凸点33脱离第二凹槽13卡接并随着注射杆2一起向下移动，密封环3与注射筒1之间的间隙产生的压缩空气对第一台阶面43产生推动针座4向上的弹性应力越来越大，直至卡接头222穿过缓冲空腔41并与针座4上的卡槽42卡接；继续把注射杆2往下推动，使弹簧套22上的第一止动凸点221脱离第一凹槽13的卡接，压缩弹簧24对弹簧套22的弹性应力加上压缩空气对针座4的弹性应力使弹簧套22和针座4一起回缩到注射杆2的空腔内，压缩弹簧24伸展后能够顶压弹簧套22在注射杆2空腔内的最顶端，从而保障针头45不会回落露出注射杆2，通过这样的复合式注射器组装结构，使用者操作注射器实施注射和自毁时能够有明显的阶段划分，每个阶段都有清晰的操作反馈，能够保证实施注射的安全性，实现自毁的可靠性。
优选的，如图5所示，密封环3为橡胶块，密封环3上下端均设有受到挤压时发生形变的承压曲面32，便于密封环3受压时更易变形。
优选的，注射杆2底端设置有用于挤压密封环3的橡胶密封塞25，该橡胶密封塞25与注射筒内壁密闭配合，进一步提高密封性。
优选的，密封环3的外壁设有第二止动凸点33，注射筒1的内壁上设有与 第二止动凸点33卡接的第二凹槽13，保障结构可靠。
优选的，注射杆上端设有后盖26，后盖26与注射杆2卡接，防止实现自毁功能后弹簧套22飞出注射杆。
优选的，注射杆2的上端设有外凸的凸沿27，注射筒1内壁上端设有与凸沿27相匹配的卡接部12，当实现自毁后，注射杆2的凸沿27卡接在卡接部12上，从而避免注射杆2拔出注射筒1，进一步避免注射器被重复使用。
优选的，注射筒1下端还套设有护套5，护套5卡接在注射筒1的外壁上，使注射器更加安全。
上述实施方式仅为本发明的优选实施方式，不能以此来限定本发明保护的范围，本领域的技术人员在本发明的基础上所做的任何非实质性的变化及替换均属于本发明所要求保护的范围

Claims (7)

  1. 一种复合式安全自毁注射器，其特征在于，包括，
    注射筒，注射筒的底壁径向内缩形成第一卡口；
    注射杆，注射杆活动的穿接在注射筒内，且注射杆下端部与注射筒内壁密闭配合，注射杆内为空腔，注射杆的底壁径向内缩形成第二卡口，注射杆空腔下方安装有可相对注射杆向上运动的弹簧套，弹簧套的外壁设有第一止动凸点，第二卡口的内壁上设有与第一止动凸点卡接的第一凹槽，注射杆的内壁下方设有抵触部，弹簧套的顶部与抵触部之间设有压缩弹簧，压缩弹簧用于提供一个推动弹簧套远离抵触部的弹性应力，弹簧套的下端部固定设有卡接头；
    密封环，密封环置于注射筒底端，且与注射筒内壁密闭配合，密封环中部设有通孔；
    针座，针座由上至下分为第一段，第二段，第三段，且针座第一段，第二段，第三段的直径依次减小；针座内为空腔，针座第一段穿接在密封环的通孔内且与密封环紧密配合，针座第一段与密封环连接配合形成缓冲空腔，针座第一段空腔内设有用于与卡接头卡接的卡槽，针座第一段下端径向内缩与针座第二段形成第一台阶面；针座第二段下端径向内缩与针座第三段形成第二台阶面，针座第三段密闭的插装在注射筒第一卡口内，且第二台阶面与注射筒第一卡口上端面配合以形成防止针座向下移动的限位结构；针座第三段的空腔内固定设有针头，针头由针座向下通过注射筒第一卡口延伸至注射筒的外部。
  2. 如权利要求1所述的一种复合式安全自毁注射器，其特征在于，密封环为橡胶块，密封环上下端均设有受到挤压时发生形变的承压曲面。
  3. 如权利要求1所述的一种复合式安全自毁注射器，其特征在于，注射杆底端设置有用于挤压密封环的橡胶密封塞，该橡胶密封塞与注射筒内壁密闭配合。
  4. 如权利要求1所述的一种复合式安全自毁注射器，其特征在于，密封环的外壁设有第二止动凸点，注射筒的内壁上设有与第二止动凸点卡接的第二凹槽。
  5. 如权利要求1所述的一种复合式安全自毁注射器，其特征在于，注射杆上端设有后盖，后盖与注射杆卡接。
  6. 如权利要求1所述的一种复合式安全自毁注射器，其特征在于，注射杆的上端设有外凸的凸沿，注射筒内壁上端设有与凸沿相匹配的卡接部。
  7. 如权利要求1所述的一种复合式安全自毁注射器，其特征在于，注射筒下端还套设有护套，护套卡接在注射筒的外壁上。
PCT/CN2018/073180 2017-01-20 2018-01-18 一种复合式安全自毁注射器 WO2018133812A1 (zh)

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