WO2009097743A1 - Core rod locking device for safety syringe - Google Patents

Core rod locking device for safety syringe Download PDF

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Publication number
WO2009097743A1
WO2009097743A1 PCT/CN2009/000105 CN2009000105W WO2009097743A1 WO 2009097743 A1 WO2009097743 A1 WO 2009097743A1 CN 2009000105 W CN2009000105 W CN 2009000105W WO 2009097743 A1 WO2009097743 A1 WO 2009097743A1
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WO
WIPO (PCT)
Prior art keywords
core rod
core
locking ring
ring
elastic damping
Prior art date
Application number
PCT/CN2009/000105
Other languages
French (fr)
Chinese (zh)
Inventor
Dongsen Fang
Original Assignee
Dongsen Fang
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 Dongsen Fang filed Critical Dongsen Fang
Publication of WO2009097743A1 publication Critical patent/WO2009097743A1/en

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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
    • A61M5/50—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
    • A61M5/5013—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe
    • A61M5/502—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe for blocking 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

Definitions

  • the present invention relates to a medical device, and more particularly to a safety syringe plunger locking device. Background technique
  • a syringe is a commonly used medical device. It generally includes a jacket, a piston, a core, and a needle.
  • the disposable syringes currently used belong to the management concept, and the performance is not "one-time". It can be used repeatedly, leaving hidden dangers for cross-infection and easily spreading diseases.
  • Chinese Patent No. 00205827. 8 discloses a self-destructing safety syringe consisting of a syringe, a needle holder, a sealing ring, a rubber piston and a push rod.
  • the front end of the barrel has a cylindrical hole, and the needle holder is slidably inserted into the cylindrical hole of the cylinder.
  • the rear end of the needle holder is a puncture cone with a handle, which is easy to pierce the rubber piston film area at the end of the injection, and fits with the elastic collet at the front end of the plunger in the piston, and pulls the needle seat together with the injection needle
  • this can achieve self-destruction in one-time use, but the structure is complicated, the assembly is difficult, the size of the components is strict, and the performance is not stable enough.
  • Chinese patent application ZL2004200410686 which has a long groove in the axial direction on the core rod, and a "V" type elastic locking member is arranged in the long groove, and the two elastic tongues of the elastic locking piece respectively spur the inner wall of the outer casing and the length of the core rod The bottom of the groove.
  • the elastic locking member is not set properly, and the use process is easy to turn over, unstable and unreliable.
  • 2005200868650 discloses a safety syringe having a locking ring mounted on the rear of the casing, a cross-shaped core rod guiding groove on the rear ring cover of the locking ring, and an axial groove on the front circumferential wall, the middle circumference
  • the outer wall is provided with a tapered anti-recessing boss.
  • the inner wall of the outer casing is correspondingly provided with a retreating boss which is matched with the groove.
  • the inner wall of the locking ring is further provided with a positioning groove, and the core rod is correspondingly provided with a matching groove. Position the boss.
  • the mandrel is locked by the locking ring so that they cannot move forward or pull back and can break the mandrel through the weak area on the mandrel. Self-destruction can be achieved after one injection.
  • the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art described above, and to provide a safety syringe core rod locking device which is reasonable in structure, convenient in use, stable, and reliable in locking performance.
  • a safety syringe core rod locking device comprising a jacket, a piston and a core rod
  • the outer casing is a hollow structure
  • a core rod locking ring is mounted at the rear portion
  • the piston is fixedly mounted on the front part of the core rod and movable in the inner cavity of the outer sleeve.
  • the utility model is characterized in that: the core rod locking ring is a two-part or split semi-circular ring body, and two holes are arranged thereon.
  • One or more of the elastic damping claws are inclined to the inner side, and the tail end of the elastic damping claw is integrally connected with the wall body of the core locking ring, and the core locking ring wall body is provided with a recovery cavity corresponding to the elastic damping claw, the core rod Correspondingly, a positioning boss is arranged correspondingly with the elastic damping claw.
  • the inner cavity of the front end of the core locking ring is provided with a concave curved surface, and the core rod is correspondingly provided with a retaining projection corresponding thereto.
  • the front outer wall of the core locking ring is provided with a tapered anti-retracting boss, and a circumferential anti-recessing boss is arranged on the inner wall of the outer casing. This makes it possible to stably fix the core locking ring in the outer casing.
  • the core rod After the injection of the invention, the core rod is pulled back, the core rod can drive the needle assembly to retract into the inner cavity of the outer sleeve, and the core rod is pulled back to the position of the core rod locking ring at the rear end of the outer sleeve, and the core rod and the core rod locking ring are locked and locked.
  • the core rod can no longer move forward and backward.
  • the syringe can be self-destructed after one injection, achieving true one-time use. Compared with the prior art, the invention has reasonable structure, convenient use, stability, good safety performance, reliable locking of the core rod, and self-destruction after one injection.
  • Figure 1 is a schematic view of the structure of the present invention.
  • Figure 2 is a schematic view of the outer structure of the present invention.
  • FIG 3 is a schematic view showing the unfolding structure of the core rod locking ring of the present invention.
  • Fig. 4 is a schematic view showing another structure of the present invention.
  • a safety syringe plunger lock device includes a jacket 1, a piston 4, a core 2, and the like.
  • the outer casing has a hollow structure, and a rear core locking ring 3 is mounted at the rear.
  • the piston 4 is a good elastic body which is fixed to the front of the core rod 2 and can be moved in the inner cavity of the outer casing 1 to suck or inject the liquid medicine.
  • the core locking ring 3 is a two-piece or split semicircle.
  • the through-cavity ring composed of a ring body is provided with two or more elastic damping claws 33 inclined inwardly, and the tail end of the elastic damping claw is integrally connected with the wall body of the core locking ring, and the core locking ring wall body
  • a return chamber 34 corresponding to the elastic damping pawl is provided, and the return chamber 34 is between the core lock ring 3 and the outer sleeve 1.
  • the core rod 2 is correspondingly provided with a positioning boss 22 which is matched with the elastic damping claw 33.
  • the inner cavity of the front end of the core rod locking ring 3 is provided with a concave curved surface 31, and the core rod 2 is correspondingly provided with a retracting convexity matched thereto.
  • the retaining projection 21 may be provided at the rear of the pusher of the core rod 2, and is a convex tapered surface corresponding to the concave curved surface 31 of the core locking ring 3.
  • the rear end of the core locking ring is provided with a guiding hole 35, and the core rod 2 is movable along the axial direction thereof, and has an axial orientation effect on the core rod.
  • the core locking ring 3 adopts two semi-circular structures of separate bodies, and the corresponding engaging faces are provided with engaging projections 36 and engaging grooves 37 which are engaged with each other.
  • the rear portion of the outer casing 1 is a core rod locking ring cavity 1 1, and a core rod locking ring 3 is fitted therein.
  • the front outer wall of the core locking ring 3 is provided with a tapered anti-recessing boss 32.
  • the inner wall of the outer casing 1 is correspondingly provided with a retreating boss 12 matched thereto. They cooperate with each other and install the fixed core lock ring so that the core lock ring 3 cannot move forward or back. This makes it possible to stably fix the core lock ring in the outer casing.
  • the core rod of the present invention is provided with a frangible weak zone 23. It is provided with a weak area on the back of the push plate for separation and destruction. ,
  • the positioning boss 22 on the core rod 2 in FIG. 1 passes over the elastic damping claw 33 on the core locking ring 3, and the elastic damping claw 33 is supported rearward, and the lower end of the bearing surface can abut against the positioning boss 22 of the core rod 2.
  • the elastic damping pawl 33 can also be supported forward, and its thrust end can be abutted against the positioning boss 22 of the core rod 2, locking the core rod and preventing the core rod from moving backward.
  • the safety syringe plunger locking device of Figure 4 is also within the scope of this patent application.
  • the use process of the invention is as follows: After the injection is completed, the core rod is pulled back, the needle assembly can be retracted into the inner cavity of the outer sleeve with the core rod, and the core rod is locked to the position of the core rod locking ring at the rear end of the outer sleeve, the core rod and the core When the rod locking ring is engaged, the core rod can no longer move forward and backward.
  • the core rod is broken from the weak fracture zone of the core rod, and self-destruction can be achieved after one injection, realizing a true one-time use.
  • the invention has reasonable structure, convenient and stable use, reliable locking of the core rod, and self-destruction after one injection.

Abstract

A core rod locking device for a safety syringe includes a housing (1), a piston (4), and a core rod (2). A core rod locking ring (3) is fixed at the rear of the housing (1), and the core rod locking ring (3) is a through cavity ring composed of two integrated or separated semicircular ring bodies, on which is provided with elastic damping claws (33) inclined towards inside. The tail end of the elastic damping claws (33) are integrated with the wall body of the core rod locking ring (3), and an orientation boss (22) that is cooperated and orientated with the elastic damping claw (33) is provided on the core rod (2). A concave arc surface (31)is provided in the inner cavity of the front end of the core rod locking ring (3), and a stop boss (21) that is cooperated with the concave arc surface (31) is provided on the core rod (2).

Description

安全注射器芯杆锁定装置 技术领域  Safety syringe core rod locking device
本发明涉及一种医疗器械， 具体地说是一种安全注射器芯杆锁定装置。 背景技术  The present invention relates to a medical device, and more particularly to a safety syringe plunger locking device. Background technique
我们知道， 注射器是一种常用的医疗器具。 其一般包括外套、 活塞、 芯 杆、针头。现在使用的一次性注射器属于管理性概念，使用性能上并不是"一 次性"， 可以反复多次使用， 给交叉感染留有隐患， 容易引起疾病传播。 中国 专利 00205827. 8公开了一种自毁式安全注射器， 由针筒、 针头座、 密封圈、 橡胶活塞及推杆组成，针筒前端有圆柱孔，针头座呈滑动装入针筒圆柱孔内， 由密封圈实现密闭， 针头座后端是带柄的穿刺圆锥体， 在注射终点易于穿破 橡胶活塞薄膜区， 与活塞中推杆前端的弹性夹头契合， 将针头座连同注射针 头拉入针筒内， 这样可以实现一次性使用自毁， 但结构复杂， 装配困难， 对 部件尺寸要求严格， 使用性能也不够稳定。 中国专利申请 ZL2004200410686, 其在芯杆上沿轴向设有一长槽， 长槽内设有" V "型弹性锁止件， 弹性锁止件 的两弹性舌片分别刺向外套内壁和芯杆长槽底面。 但弹性锁止件设置不够合 理， 使用过程容易发生翻转， 不稳定、 不可靠。 中国专利 2005200868650公 布了一种安全注射器， 其外套后部安装有锁定环， 锁定环后部圆周挡盖上设 有十字型芯杆导向槽， 前部圆周壁上轴向设有开口槽， 中间圆周外壁上设有 带锥度的止退凸台， 外套内壁圆周上相应地设有一与其配合的止退凸台， 锁 定环内壁圆周上还设有定位凹槽，芯杆上相应地设有一与其配合的定位凸台。 由锁定环锁定芯杆， 使它们既不能向前移动， 也不能向后拉动， 并可以通过 芯杆上的薄弱区折断芯杆。 一次注射后即可实现自毁。  We know that a syringe is a commonly used medical device. It generally includes a jacket, a piston, a core, and a needle. The disposable syringes currently used belong to the management concept, and the performance is not "one-time". It can be used repeatedly, leaving hidden dangers for cross-infection and easily spreading diseases. Chinese Patent No. 00205827. 8 discloses a self-destructing safety syringe consisting of a syringe, a needle holder, a sealing ring, a rubber piston and a push rod. The front end of the barrel has a cylindrical hole, and the needle holder is slidably inserted into the cylindrical hole of the cylinder. Sealed by a sealing ring, the rear end of the needle holder is a puncture cone with a handle, which is easy to pierce the rubber piston film area at the end of the injection, and fits with the elastic collet at the front end of the plunger in the piston, and pulls the needle seat together with the injection needle In the syringe, this can achieve self-destruction in one-time use, but the structure is complicated, the assembly is difficult, the size of the components is strict, and the performance is not stable enough. Chinese patent application ZL2004200410686, which has a long groove in the axial direction on the core rod, and a "V" type elastic locking member is arranged in the long groove, and the two elastic tongues of the elastic locking piece respectively spur the inner wall of the outer casing and the length of the core rod The bottom of the groove. However, the elastic locking member is not set properly, and the use process is easy to turn over, unstable and unreliable. Chinese Patent No. 2005200868650 discloses a safety syringe having a locking ring mounted on the rear of the casing, a cross-shaped core rod guiding groove on the rear ring cover of the locking ring, and an axial groove on the front circumferential wall, the middle circumference The outer wall is provided with a tapered anti-recessing boss. The inner wall of the outer casing is correspondingly provided with a retreating boss which is matched with the groove. The inner wall of the locking ring is further provided with a positioning groove, and the core rod is correspondingly provided with a matching groove. Position the boss. The mandrel is locked by the locking ring so that they cannot move forward or pull back and can break the mandrel through the weak area on the mandrel. Self-destruction can be achieved after one injection.
发明内容 Summary of the invention
本发明所要解决的技术问题是克服上述现有技术的不足， 提供一种构造 合理， 使用方便、 稳定， 锁定性能可靠的安全注射器芯杆锁定装置。  The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art described above, and to provide a safety syringe core rod locking device which is reasonable in structure, convenient in use, stable, and reliable in locking performance.
本发明解决上述技术问题采用的技术方案是： 一种安全注射器芯杆锁定 装置， 其包括外套、 活塞、 芯杆， 外套为中空结构， 后部安装有芯杆锁定环， 活塞安装固定在芯杆前部， 可在外套内腔中移动， 其特征是： 所述芯杆锁定 环为两个连体或分体的半圆型环体组成的通腔环， 其上设有两个或多个向内 侧倾斜弹性阻尼爪， 弹性阻尼爪的尾端与芯杆锁定环的壁体连成一体， 芯杆 锁定环壁体上设有与弹性阻尼爪相对应的回复腔， 芯杆上相应的设有与弹性 阻尼爪配合定位的定位凸台， 芯杆锁定环前端内腔设有凹弧面， 芯杆上相应 地设有一与其配合的止退凸台。 The technical solution adopted by the present invention to solve the above technical problems is: a safety syringe core rod locking device comprising a jacket, a piston and a core rod, the outer casing is a hollow structure, and a core rod locking ring is mounted at the rear portion, The piston is fixedly mounted on the front part of the core rod and movable in the inner cavity of the outer sleeve. The utility model is characterized in that: the core rod locking ring is a two-part or split semi-circular ring body, and two holes are arranged thereon. One or more of the elastic damping claws are inclined to the inner side, and the tail end of the elastic damping claw is integrally connected with the wall body of the core locking ring, and the core locking ring wall body is provided with a recovery cavity corresponding to the elastic damping claw, the core rod Correspondingly, a positioning boss is arranged correspondingly with the elastic damping claw. The inner cavity of the front end of the core locking ring is provided with a concave curved surface, and the core rod is correspondingly provided with a retaining projection corresponding thereto.
所述芯杆锁定环前部外壁设有带锥度的止退凸台， 外套内壁圆周上相应 地设有一与其配合的止退凸台。 这样可以稳定地在外套中固定芯杆锁定环。  The front outer wall of the core locking ring is provided with a tapered anti-retracting boss, and a circumferential anti-recessing boss is arranged on the inner wall of the outer casing. This makes it possible to stably fix the core locking ring in the outer casing.
本发明注射完毕后， 回拉芯杆， 芯杆可带动针头组件回缩至外套的内腔 内， 回拉芯杆至外套后端的芯杆锁定环位置， 芯杆与芯杆锁定环配合锁定， 芯杆不能再前移和后退。 注射器一次注射后即可实现自毁， 实现真正的一次 性使用。 对照现有技术， 本发明构造合理， 使用方便、 稳定， 安全性能好， 芯杆锁定可靠， 一次注射后即可实现自毁。  After the injection of the invention, the core rod is pulled back, the core rod can drive the needle assembly to retract into the inner cavity of the outer sleeve, and the core rod is pulled back to the position of the core rod locking ring at the rear end of the outer sleeve, and the core rod and the core rod locking ring are locked and locked. The core rod can no longer move forward and backward. The syringe can be self-destructed after one injection, achieving true one-time use. Compared with the prior art, the invention has reasonable structure, convenient use, stability, good safety performance, reliable locking of the core rod, and self-destruction after one injection.
附图说明 DRAWINGS
下面结合附图对本发明进一步说明。  The invention will now be further described with reference to the accompanying drawings.
图 1是本发明的结构示意图。  Figure 1 is a schematic view of the structure of the present invention.
图 2是本发明外套结构示意图。  Figure 2 is a schematic view of the outer structure of the present invention.
图 3是本发明芯杆锁定环展开结构示意图。  3 is a schematic view showing the unfolding structure of the core rod locking ring of the present invention.
图 4是本发明另一种结构示意图。  Fig. 4 is a schematic view showing another structure of the present invention.
图中 1.外套， 2.芯杆， 3.芯杆锁定环， 4.活塞， 1 1.锁定环容腔， 12.止退 凸台， 21.止退凸台， 22.定位凸台， 23.折断薄弱区， 31.凹锥面， 32. 止退凸 台， 33. 弹性阻尼爪， 34.回复腔， 35.导向孔， 36.卡合凸起， 37.卡合凹槽。 具体实施方式  Figure 1. Jacket, 2. Core rod, 3. Core rod locking ring, 4. Piston, 1 1. Locking ring cavity, 12. Retreating boss, 21. Retreating boss, 22. Positioning boss, 23. Fold the weak area, 31. Concave cone, 32. Retreat boss, 33. Elastic damping claw, 34. Recovery cavity, 35. Guide hole, 36. Engagement projection, 37. Engagement groove. detailed description
从图 1中可以看出， 一种安全注射器芯杆锁定装置， 其包括外套 1、 活 塞 4、 芯杆 2等。 外套为中空结构， 后部安装有芯杆锁定环 3， 活塞 4是一种 良好的弹性体， 安装固定在芯杆 2前部， 可在外套 1内腔中移动， 抽吸或注 射药液。  As seen in Figure 1, a safety syringe plunger lock device includes a jacket 1, a piston 4, a core 2, and the like. The outer casing has a hollow structure, and a rear core locking ring 3 is mounted at the rear. The piston 4 is a good elastic body which is fixed to the front of the core rod 2 and can be moved in the inner cavity of the outer casing 1 to suck or inject the liquid medicine.
从图 1、 图 3中可以看出， 所述芯杆锁定环 3为两个连体或分体的半圆 型环体组成的通腔环， 其上设有两个或多个向内侧倾斜弹性阻尼爪 33， 弹性 阻尼爪的尾端与芯杆锁定环的壁体连成一体， 芯杆锁定环壁体上设有与弹性 阻尼爪相对应的回复腔 34，回复腔 34在芯杆锁定环 3和外套 1之间。芯杆 2 上相应的设有与弹性阻尼爪 33配合定位的定位凸台 22， 芯杆锁定环 3前端 内腔设有凹弧面 31，芯杆 2上相应地设有一与其配合的止退凸台 21。该止退 凸台 21可以设在芯杆 2推板的后部， 为与芯杆锁定环 3凹弧面 31相对应的 凸锥面。 芯杆锁定环后端设有导向孔 35， 芯杆 2可沿其轴向移动， 对芯杆有 轴向定向作用。 考虑到安装的需要， 芯杆锁定环 3采用分体的两个半圆型结 构，其组合时相对应的接合面上设有相互卡合的卡合凸起 36和卡合凹槽 37。 As can be seen from Figures 1 and 3, the core locking ring 3 is a two-piece or split semicircle. The through-cavity ring composed of a ring body is provided with two or more elastic damping claws 33 inclined inwardly, and the tail end of the elastic damping claw is integrally connected with the wall body of the core locking ring, and the core locking ring wall body A return chamber 34 corresponding to the elastic damping pawl is provided, and the return chamber 34 is between the core lock ring 3 and the outer sleeve 1. The core rod 2 is correspondingly provided with a positioning boss 22 which is matched with the elastic damping claw 33. The inner cavity of the front end of the core rod locking ring 3 is provided with a concave curved surface 31, and the core rod 2 is correspondingly provided with a retracting convexity matched thereto. Taiwan 21. The retaining projection 21 may be provided at the rear of the pusher of the core rod 2, and is a convex tapered surface corresponding to the concave curved surface 31 of the core locking ring 3. The rear end of the core locking ring is provided with a guiding hole 35, and the core rod 2 is movable along the axial direction thereof, and has an axial orientation effect on the core rod. In view of the need for installation, the core locking ring 3 adopts two semi-circular structures of separate bodies, and the corresponding engaging faces are provided with engaging projections 36 and engaging grooves 37 which are engaged with each other.
从图 1、 图 2、 图 3中可以看出， 所述外套 1后部为芯杆锁定环容腔 1 1， 其内卡合安装有芯杆锁定环 3。 所述芯杆锁定环 3前部外壁设有带锥度的止 退凸台 32，外套 1内壁圆周上相应地设有一与其配合的止退凸台 12。它们相 互配合， 安装固定芯杆锁定环， 使芯杆锁定环 3不能前移， 也不能后退。 这 样可以稳定地在外套中固定芯杆锁定环。  As can be seen from Fig. 1, Fig. 2, Fig. 3, the rear portion of the outer casing 1 is a core rod locking ring cavity 1 1, and a core rod locking ring 3 is fitted therein. The front outer wall of the core locking ring 3 is provided with a tapered anti-recessing boss 32. The inner wall of the outer casing 1 is correspondingly provided with a retreating boss 12 matched thereto. They cooperate with each other and install the fixed core lock ring so that the core lock ring 3 cannot move forward or back. This makes it possible to stably fix the core lock ring in the outer casing.
本发明所述芯杆上设有一易折断薄弱区 23。其是在推板后部设有连接上 的薄弱区， 以便分离毁坏。 ，  The core rod of the present invention is provided with a frangible weak zone 23. It is provided with a weak area on the back of the push plate for separation and destruction. ,
图 1中芯杆 2上的定位凸台 22越过芯杆锁定环 3上的弹性阻尼爪 33， 弹性阻尼爪 33向后支撑， 其承推面下端可触靠在芯杆 2的定位凸台 22上， 锁定芯杆并阻止芯杆前移。 同样道理， 弹性阻尼爪 33也可以向前支撑， 其承 推面上端可触靠在芯杆 2的定位凸台 22上，锁定芯杆并阻止芯杆后移。如图 4所示。 因此， 图 4所示安全注射器芯杆锁定装置也属于本专利申请保护范 围。  The positioning boss 22 on the core rod 2 in FIG. 1 passes over the elastic damping claw 33 on the core locking ring 3, and the elastic damping claw 33 is supported rearward, and the lower end of the bearing surface can abut against the positioning boss 22 of the core rod 2. Upper, lock the core rod and prevent the core rod from moving forward. By the same token, the elastic damping pawl 33 can also be supported forward, and its thrust end can be abutted against the positioning boss 22 of the core rod 2, locking the core rod and preventing the core rod from moving backward. As shown in Figure 4. Accordingly, the safety syringe plunger locking device of Figure 4 is also within the scope of this patent application.
本发明使用过程是这样的： 注射完毕后， 回拉芯杆， 针头组件可以随芯 杆回缩至外套的内腔内， 回拉芯杆至外套后端的芯杆锁定环位置， 芯杆与芯 杆锁定环配合， 芯杆不能再前移和后退。 从芯杆的薄弱折断区处折断芯杆， 一次注射后即可实现自毁， 实现真正的一次性使用。 本发明构造合理， 使用 方便、 稳定， 芯杆锁定可靠， 一次注射后即可实现自毁。  The use process of the invention is as follows: After the injection is completed, the core rod is pulled back, the needle assembly can be retracted into the inner cavity of the outer sleeve with the core rod, and the core rod is locked to the position of the core rod locking ring at the rear end of the outer sleeve, the core rod and the core When the rod locking ring is engaged, the core rod can no longer move forward and backward. The core rod is broken from the weak fracture zone of the core rod, and self-destruction can be achieved after one injection, realizing a true one-time use. The invention has reasonable structure, convenient and stable use, reliable locking of the core rod, and self-destruction after one injection.

Claims

权 利 要 求 书 Claim
1 . 一种安全注射器芯杆锁定装置， 其包括外套、 活塞、 芯杆， 外套为中 空结构， 后部安装有芯杆锁定环， 活塞安装固定在芯杆前部， 可在外套内腔 中移动， 其特征是： 所述芯杆锁定环为两个连体或分体的半圆型环体组成的 通腔环， 其上设有两个或多个向内侧倾斜弹性阻尼爪， 弹性阻尼爪的尾端与 芯杆锁定环的壁体连成一体， 芯杆锁定环壁体上设有与弹性阻尼爪相对应的 回复腔， 芯杆上相应的设有与弹性阻尼爪配合定位的定位凸台， 芯杆锁定环 前端内腔设有凹弧面， 芯杆上相应地设有一与其配合的止退凸台。 What is claimed is: 1. A safety syringe plunger locking device comprising a jacket, a piston, a core rod, a jacket having a hollow structure, a core locking ring mounted at a rear portion, the piston being mounted and fixed at a front portion of the core rod, movable in the inner cavity of the jacket, The utility model is characterized in that: the core rod locking ring is a through-cavity ring composed of two conjoined or split semi-circular ring bodies, and two or more elastic damping claws are inclined on the inner side, and the tail of the elastic damping claw is provided. The end is integrally connected with the wall of the core locking ring. The wall of the core locking ring is provided with a recovery cavity corresponding to the elastic damping claw, and the positioning rod of the core rod correspondingly arranged with the elastic damping claw is disposed. The inner cavity of the front end of the core locking ring is provided with a concave curved surface, and the core rod is correspondingly provided with a retreating boss which cooperates with the core rod.
2. 根据权利要求 1所述的安全注射器芯杆锁定装置， 其特征是： 所述芯 杆锁定环前部外壁设有带锥度的止退凸台， 外套内壁圆周上相应地设有一与 其配合的止退凸台。  2. The safety syringe plunger locking device according to claim 1, wherein: the outer wall of the front portion of the core locking ring is provided with a tapered anti-retracting boss, and the inner wall of the outer casing is correspondingly provided with a matching portion thereof. Stop the boss.
3. 根据权利要求 1所述的安全注射器芯杆锁定装置， 其特征是： 芯杆锁 定环的两个半圆型环体相对应的接合面上设有相互卡合的卡合凸起和卡合凹 槽。  3. The safety syringe plunger locking device according to claim 1, wherein: the corresponding engagement faces of the two semicircular ring bodies of the core locking ring are provided with engaging projections and engagements that are engaged with each other. Groove.
PCT/CN2009/000105 2008-02-04 2009-01-23 Core rod locking device for safety syringe WO2009097743A1 (en)

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CNA2008100146224A CN101229406A (en) 2008-02-04 2008-02-04 Safety injector core bar lockup device
CN200810014622.4 2008-02-04

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