WO2013159254A1 - 一种针座回拉式安全自锁式自毁注射器 - Google Patents

一种针座回拉式安全自锁式自毁注射器 Download PDF

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Publication number
WO2013159254A1
WO2013159254A1 PCT/CN2012/000739 CN2012000739W WO2013159254A1 WO 2013159254 A1 WO2013159254 A1 WO 2013159254A1 CN 2012000739 W CN2012000739 W CN 2012000739W WO 2013159254 A1 WO2013159254 A1 WO 2013159254A1
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WO
WIPO (PCT)
Prior art keywords
needle
self
locking
core rod
seat
Prior art date
Application number
PCT/CN2012/000739
Other languages
English (en)
French (fr)
Inventor
张林锋
Original Assignee
Zhang Linfeng
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 Zhang Linfeng filed Critical Zhang Linfeng
Priority to EP12875147.6A priority Critical patent/EP2851101A4/en
Priority to US14/411,518 priority patent/US20150314079A1/en
Publication of WO2013159254A1 publication Critical patent/WO2013159254A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • 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
    • 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
    • A61M5/3234—Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user
    • 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
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31501—Means for blocking or restricting the movement of the rod or piston
    • A61M2005/31508—Means for blocking or restricting the movement of the rod or piston provided on the 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
    • A61M5/32—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
    • 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
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/02—General characteristics of the apparatus characterised by a particular materials
    • A61M2205/0216—Materials providing elastic properties, e.g. for facilitating deformation and avoid breaking

Definitions

  • the invention relates to the technical field of medical instruments, in particular to a needle-seat pull-back type self-locking self-destructing syringe, in particular to a mechanical connecting structure thereof.
  • the movable needle seat is provided with a hook extending into the injection liquid storage cavity body, and the sealing plug is provided with a tightening slope of the hook, and the deflection slope is provided below the inclined slope
  • the axis of the deflecting hole is inclined with the axis of the outer sleeve, and the sealing plug is provided with a fastening cavity for connecting the sealing plug and the hook, and the outer tube of the outer side of the hook is larger than the outer diameter of the movable needle seat. , hook the jacket on the other side to constrain the movable needle seat.
  • a through-groove symmetrically distributed with respect to the central axis, and two bosses symmetrically distributed with respect to the central axis are formed in the middle of the two-way groove, the boss is engaged with the corresponding groove on the syringe, and a bottom is formed on the bottom of the inner hole of the cone a groove; a front end of the support base is provided with a plurality of elastic claws engageable with the boss of the core head, and a flange is disposed at the outer middle portion.
  • the object of the present invention is to provide a needle-seat pull-back safety self-locking self-destructing syringe.
  • the needle seat and the outer sleeve of the structure syringe can be assembled at an arbitrary angle, the needle seat is simple and efficient to form, and the needle withdrawal resistance is large, and the self-locking device low cost.
  • the needle of the syringe is fixed firmly by the toothed sleeve, preventing rotation, the force required to trigger the self-destructing device is small, the syringe does not shake, the injection is safer and more reliable, and the core rod and the syringe barrel are formed.
  • the self-locking mechanism effectively prevents the needle from being pushed out twice, and truly realizes the safe operation of the syringe, overcoming the shortcomings and deficiencies in the prior art.
  • a needle-seat pull-back type safety self-locking self-destructing syringe which comprises a syringe barrel, a syringe rod is arranged in the barrel, and a plunger is sleeved near the end of the core rod.
  • the needle neck of the end of the syringe barrel is provided with a needle seat, and the outer wall of the needle seat is sleeved with a sealing ring, wherein: the upper part of the needle seat forms a replaceable needle head, and the lower cavity of the needle seat is provided with an elastic support card.
  • the elastic support card is provided with a core rod
  • the end-matching locking engagement mechanism has an elastic characteristic
  • the elastic support card member externally forms an elastic support limiting mechanism that cooperates with the inner wall of the inner cavity of the syringe barrel, and the end of the core rod is formed to cooperate with the locking and engaging mechanism The occlusion.
  • a needle seat pull-back type safety self-locking self-destructing syringe which comprises a syringe barrel, a core rod is arranged in the syringe barrel, and a plunger is sleeved near the end of the core rod, the syringe barrel
  • the needle neck of the end portion is provided with a needle seat, and the outer wall of the needle seat is sleeved with a sealing ring
  • the lower cavity of the needle seat is provided with an elastic support card member
  • the elastic support card member is provided with a core rod end a locking engagement mechanism having a resilient characteristic
  • the elastic support card member externally forming an elastic support limiting mechanism that cooperates with an inner wall of the inner cavity of the syringe barrel
  • the end of the core rod is formed to cooperate with the locking and engaging mechanism The occlusion.
  • the invention discloses a needle seat pull-back type safety self-locking self-destructing syringe, which has the beneficial effects that: the needle seat and the outer sleeve can be directly embedded and assembled in any direction in the whole circumference; the needle withdrawal force acts on the hub cone seat, the claw The limit function can provide a large anti-needle resistance in the forward direction; when the pull back, the jaws only need to be deformed to reduce the pull-back resistance in the reverse direction; the elastic support clip and the end of the core rod cooperate with the locking and occlusion mechanism, The elastic traits do not feel the process of the end of the mandrel entering the locking occlusion mechanism during clinical injection.
  • the locking occlusion mechanism loses the inward elastic trait, and the pull-back can be realized.
  • the self-locking structure of the core rod and the outer sleeve is simple and easy to manufacture, but the self-locking function can be achieved, which effectively improves the safe operation performance of the product.
  • the overall design of the syringe is reasonable and the working condition is stable. Compared with the prior art, it has outstanding substantive features and significant progress.
  • Figure 1 is a cross-sectional view showing a planar structure of a first embodiment of the present invention.
  • Figure 2 is a perspective view showing the three-dimensional structure of the syringe barrel.
  • Figure 3 is a cross-sectional view of the core rod structure.
  • Figure 4 is a schematic view of the three-dimensional structure of the hub cone.
  • Figure 5 is a cross-sectional view showing the planar structure of the hub cone.
  • Figure 6 is a schematic perspective view of the elastic support card.
  • Figure 7 is a schematic view of the original state of the first embodiment of the syringe.
  • Figure 8 is a plan sectional view showing the state of liquid absorption of the first embodiment of the syringe.
  • Figure 9 is a plan sectional view showing the state of the liquid pushing state of the first embodiment of the syringe.
  • Figure 10 is a plan sectional view showing the state in which the first embodiment of the syringe is injected.
  • Figure 11 is a cross-sectional view showing the state in which the claw of the first embodiment of the syringe is disengaged from the retaining groove.
  • Figure 12 is a cross-sectional view showing the self-locking state of the plunger of the first embodiment of the syringe.
  • Figure 13 is a schematic view showing the state in which the core rod of the first embodiment of the syringe is broken.
  • Figure 14 is a cross-sectional view showing a planar structure of a second embodiment of the present invention.
  • Figure 15 is a plan sectional view showing the state of liquid absorption of the second embodiment of the syringe.
  • Figure 16 is a plan sectional view showing the state of the liquid pushing state of the second embodiment of the syringe.
  • Figure 17 is a plan sectional view showing the state in which the second embodiment of the syringe is injected.
  • Figure 18 is a cross-sectional view showing the state in which the claw of the second embodiment of the syringe is disengaged from the retaining groove.
  • Figure 19 is a cross-sectional view showing the self-locking state of the plunger of the second embodiment of the syringe.
  • Figure 20 is a cross-sectional view of the needle hub of the second embodiment of the syringe.
  • Figure 21 is a perspective view of the plunger of the syringe. detailed description
  • the invention relates to a needle seat pull-back type safety self-locking self-destructing syringe, which comprises a syringe barrel body 6.
  • the syringe barrel body 6 is provided with a core rod 7, and the core rod 7 is sleeved with a piston 5 near the end, the syringe
  • the needle neck of the end of the barrel 6 is provided with a needle seat, and the outer wall of the needle seat is sleeved with a sealing ring 3, which is different from the prior art in that: the upper part of the needle seat forms a replaceable needle head, and the lower cavity of the needle seat is provided
  • the elastic supporting clip 4 is provided with a locking and engaging mechanism matched with the end of the core rod.
  • the locking and engaging mechanism has an elastic characteristic, and the outer portion of the elastic supporting member 4 is formed inside the syringe barrel 6.
  • the inner wall of the cavity cooperates with the elastic support limiting mechanism, and the end of the core rod forms a nip portion that cooperates with the locking and engaging mechanism.
  • a needle seat pull-back type safety self-locking self-destructing syringe which comprises a syringe barrel 6; a syringe barrel 6 is provided with a core rod 7 which is sleeved near the end portion
  • the piston 5 is provided with a needle holder in the neck of the end of the syringe barrel 6.
  • the outer wall of the needle holder is sleeved with a sealing ring 3, which is different from the prior art in that: the lower part of the needle holder is provided with an elastic supporting card member 4
  • the elastic supporting clip 4 is provided with a locking and engaging mechanism that cooperates with the end of the core rod.
  • the locking and engaging mechanism has an elastic characteristic, and the elastic supporting clip 4 forms an elasticity corresponding to the inner wall of the inner cavity of the syringe barrel 6.
  • the support limiting mechanism, the end of the core rod forms a nip portion that cooperates with the locking engagement mechanism.
  • the replaceable needle head is a cone seat 2 with a guiding hub, and the screw of the cone seat 2 of the guiding hub can cooperate with the 6:100 international standard injection needle 1 to realize the needle changeable needle of the syringe.
  • the annular inner groove 22 is formed at the inner wall of the lower cavity of the needle seat.
  • An annular outer groove 23 is disposed at the outer wall of the needle seat, and the sealing ring 3 is disposed in the annular outer groove 23 to ensure a sealing effect between the needle seat and the inner wall of the cylinder.
  • the outer wall of the cone 2 of the guiding hub has an annularly evenly distributed bearing hub 21 with a guiding function, which ensures that the hub cone can be accurately assembled into the syringe barrel in any direction. In vivo, thus enabling fully automated production at a very low cost during assembly.
  • the elastic supporting clip 4 has an approximately hollow cylindrical shape, and two elastically deformable elastic deformation fins 45 are formed on the upper portion of the elastic supporting clip 4, and the upper outer edge of the elastic deformation fin 45 is formed in the annular shape.
  • the groove 22 is matched with the annular flange 41, and the two pieces of elastic deformation fins 45 form a gap 44.
  • the upper surface of the elastic support clip 4 at the lower portion of the notch 44 forms two symmetrical arc-shaped platforms 47, two arcs. Each of the shaped platforms 47 is provided with a pawl piece 43.
  • the two pieces of the pawl pieces 43 are symmetrical with each other, and the extension lines of the upper ends of the two pieces of the pawl pieces 43 form an angle, and both sides of the pawl piece 43 and the inner side of the elastic deformation piece 45 are formed.
  • a gap 46 is formed therebetween, and two opposite pawl pieces 43 constitute the above-mentioned locking engagement mechanism, and the inner side of the pawl piece 43 is expanded outward when subjected to a force, and has an elastic characteristic, and a circular card 48 is disposed at a lower portion of the elastic supporting card member 4.
  • the circular card 48 is provided with a plurality of cutting gaps 481.
  • the circular cross line card 48 is cut off four gap 481 is divided into four separate jaws 42.
  • the inner wall of the neck of the syringe barrel 6 forms a toothed sleeve 61 matching the number of the hub 21, and the structure of the hub and the toothed sleeve prevents the injection needle from rotating during injection, thereby avoiding This brings pain to the patient.
  • the lower tube of the toothed sleeve 61 An annular retaining groove 62 is formed at the inner wall of the neck to cooperate with the claw 42.
  • a convex self-locking ring 63 is disposed at the inner wall of the lower portion of the syringe barrel 6.
  • the engaging portion of the end portion of the core rod 7 is an annular boss 701, and the outer diameter of the annular boss 701 is larger than the spacing between the top ends of the two pieces of the pawl piece 43.
  • An annular card slot 702 is formed at the core of the lower portion of the 701, and a circular limiting piece 703 is formed at the core of the lower annular slot 702.
  • the lower portion of the circular limiting piece 703 is provided with a divergent distribution.
  • the diameter of the annular boss 701 is larger than the spacing between the two pieces of the pawl piece 43, so as to ensure that when the core rod is pulled back, the annular boss 701 at the end of the core rod is in two pieces. Above the end of the pawl piece 43, the engagement locking effect of the core rod and the needle seat is achieved.
  • the core rod 7 is provided with a rib 705 distributed in a cross shape, wherein a rib 706 is formed at a rib 705, and a protective sheet 707 is disposed at the notch, and both ends of the protective sheet 707 and the notch are The two inner side wall points are connected to each other, and the protective piece 707 forms a bent portion 708 near the middle portion, and a convex portion 709 is formed at the bent portion 708.
  • the protrusion of the protective sheet just abuts against the outer edge of the lower end of the syringe barrel 6.
  • the protective sheet When in use, the protective sheet is pressed inward along the bent portion, and the protective sheet is bent inwardly so that the protrusion is displaced inwardly and disengaged.
  • the outer edge of the lower end of the barrel 6 can be used normally. This structure can effectively prevent the syringe from malfunctioning and trigger the internal safety mechanism, resulting in the scrapping of the syringe.
  • Figure 8 is a cross-sectional view showing the planar structure of the pumping, before pushing the liquid, First press the protective sheet to eliminate the blockage of the pusher forward push. See Figure 9 for a plan view of the push-up state.
  • the anti-retraction resistance is the outer ring of the claw and the syringe barrel of the elastic support clip. The anti-retraction resistance of the two can be achieved by the anti-retraction groove, and the balance structure for resisting the retracting force and the pulling back force can be realized.
  • the core rod is pulled back, as shown in FIG. 11, the elastic support card member is driven to move downward together under the engagement state between the card slot and the pawl of the core rod, and at the same time, the claw of the elastic support clip member is elastically supported.
  • the outer diameter of the claw becomes small, and the detachment from the retaining groove of the outer sleeve is smoothly performed.
  • the core rod will drive the entire needle seat with the universal injection needle until the core rod
  • the wing blade passes over the self-locking ring of the syringe barrel, and the circular limiting piece and the wing piece of the core rod are stuck between the self-locking ring of the syringe barrel.
  • the core rod can neither be pulled back nor front Push, as shown in Figure 12, at this point, the entire needle head is retracted into the syringe and a safe self-locking is achieved.
  • the final force is applied to the self-destruction point, so that the core rod is broken or broken, and the head of the core rod is destroyed in the outer casing.

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

Abstract

一种回拉式安全自锁式自毁注射器，它包括注射器筒体（6），注射器筒体（6）内设有芯杆（7），注射器筒体（6）端部的筒颈内设有针座，针座外壁套接有密封圈（3），所述针座上部形成可换针头部，针座的下部腔体内设有弹性支撑卡件（4），该弹性支撑卡件（4）内设有与芯杆（7）端部相配合的锁定咬合机构，该锁定咬合机构具有弹性特质，而且该弹性支撑卡件（4）外部形成与注射器筒体（6）内腔内壁相配合的弹性支撑限位机构，芯杆（7）端部形成与锁定咬合机构相配合的咬合部。

Description

一种针座回拉式安全自锁式自毁注射器 技术领域
本发明涉及医疗器械的技术领域，具体的说是一种针座回拉式安 全自锁式自毁注射器， 特别涉及其机械连接结构。
ϋ
对比文件 1， 专利申请号： 200910029167. X, 申请人： 周立刚， 申请日： 2009. 1. 7, 公开号： CN101474443A, 本案公开了一种安全自 毁医用注射器，其活动针座与外套上设有相互搭接配合的凸起部与卡 台，活动针座上设有伸入注射液存储腔体内的挂钩， 在密封塞上设有 挂钩的收紧斜面， 收紧斜面的下方设有偏斜孔， 偏斜孔的轴线与外套 的轴线呈偏斜设置，在密封塞上设有将密封塞与挂钩连接一体的扣合 腔，在挂钩一侧的外套的管经大于活动针座的外径， 挂钩另一侧的外 套将活动针座约束其内。
对比文件 2， 专利申请号： 200610049044. 9, 申请人： 林作钱， 申请日： 2006. 1. 12, 公开号： CN1803212A, 本案公开了一种安全自 毁医用注射器， 其锥座下部设立两个相对中心轴对称分布的通槽， 且 在两通槽中间设立两个相对中心轴对称分布的凸台，凸台与针筒上的 对应凹槽相卡合，锥座内孔底部上设立一个凹槽； 支撑座前端设立多 个可与芯杆头部的凸台相卡合的弹性撑爪， 外侧中部设置一凸缘。
目前自毁式注射器种类繁多， 安全注射器也很多， 但其零部件设 计繁杂， 加工困难， 组装不易， 导致成本很高； 其针尖的退针阻力不 够， 针尖容易缩回外套里， 导致药液漏出， 或是刻意增大退针阻力却 把回拉阻力也增大了， 也给使用者带来不便； 其使用时针座易发生转 动，触发自毁装置所需力大，会造成针筒抖动而导致给患者带来痛苦; 其防止误操作的阻推件需要双手操作，还需收集掰下的阻推件。因此， 有必要改进现有的安全自锁式注射器，将相关零部件的生产和组装成 本降低， 并在增大退针阻力的同时减小回拉阻力， 同时确保针座不转 动， 触发自毁装置时针筒不抖动， 还得把针尖自锁在外套内腔里， 并 设单手操作的保护片来防止在运输和拿取过程中误操作，从而达到大 批量生产和临床的安全应用。
发明内容
本发明的目的在于提供一种针座回拉式安全自锁式自毁注射器， 这种结构注射器的针座与外套可任意角度装配， 针座成型简单高效， 而且退针阻力大， 自锁装置成本低。 同时此种注射器的针头通过齿毂 齿套固定牢靠， 防止转动， 触发自毁装置所需力小， 针筒不会抖动， 能使得注射更安全可靠，并且，芯杆与注射器筒体之间形成自锁机构， 有效防止针头被二次推出， 真正实现了注射器的安全操作， 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： 一种针座回拉式安全 自锁式自毁注射器， 它包括注射器筒体注射器筒体内设有芯杆， 芯杆 靠近端部处套接有活塞， 注射器筒体端部的筒颈内设有针座， 针座外 壁套接有密封圈， 其特征在于： 所述针座 上部形成可换针头部， 针 座的下部腔体 内设有弹性支撑卡件， 该弹性支撑卡件内设有与芯杆 端部相配合的锁定咬合机构， 该锁定咬合机构具有弹性特质， 该弹性 支撑卡件外部形成与注射器筒体内腔内壁相配合的弹性支撑限位机 构， 芯杆端部形成与锁定咬合机构相配合的咬合部。
本发明另一技术方案为：一种针座回拉式安全自锁式自毁注射器， 它包括注射器筒体注射器筒体内设有芯杆，芯杆靠近端部处套接有活 塞， 注射器筒体端部的筒颈内设有针座， 针座外壁套接有密封圈， 其 特征在于： 所述针座下部腔体内设有弹性支撑卡件， 该弹性支撑卡件 内设有与芯杆端部相配合的锁定咬合机构，该锁定咬合机构具有弹性 特质，该弹性支撑卡件外部形成与注射器筒体内腔内壁相配合的弹性 支撑限位机构， 芯杆端部形成与锁定咬合机构相配合的咬合部。
本发明公开了一种针座回拉式安全自锁式自毁注射器，其有益效 果是： 针座与外套可在全周任意方向直接嵌入装配； 退针力作用于齿 毂锥座， 卡爪的限位功能能正向提供较大的退针阻力； 回拉时卡爪仅 需变形就能在反向减少回拉阻力；弹性支撑卡件与芯杆端部相配合的 锁定咬合机构， 具有弹性特质， 在临床注射时感受不到芯杆端部进入 锁定咬合机构的过程，芯杆端部进入后锁定咬合机构失去向内弹性特 质， 可以实现回拉咬合。 芯杆与外套的自锁结构简单易制造， 却能达 到自锁功能，有效提高了产品的安全操作性能。注射器整体设计合理， 工作状态稳定，相比现有技术而言， 具有突出的实质性特点和显著进 步。
附图说明
图 1为本发明第一实施例的平面结构剖视图。 图 2为注射器筒体的立体结构剖面图。
图 3为芯杆结构剖视图。
图 4为齿毂锥座立体结构示意图。
图 5为齿毂锥座平面结构剖视图。
图 6为弹性支撑卡件的立体结构示意图。
图 7为注射器第一实施例原始状态示意图。
图 8为注射器第一实施例吸液状态的平面结构剖视图。
图 9为注射器第一实施例推液状态的平面结构剖视图。
图 10为注射器第一实施例注射完毕状态的平面结构剖视图。 图 11为注射器第一实施例卡爪脱开止退槽状态的平面结构剖视 图 12为注射器第一实施例芯杆自锁状态的剖视图。
图 13为注射器第一实施例芯杆折断状态的示意图。
图 14为本发明第二实施例的平面结构剖视图。
图 15为注射器第二实施例吸液状态的平面结构剖视图。
图 16为注射器第二实施例推液状态的平面结构剖视图。
图 17为注射器第二实施例注射完毕状态的平面结构剖视图。 图 18为注射器第二实施例卡爪脱开止退槽状态的平面结构剖视 图 19为注射器第二实施例芯杆自锁状态的剖视图。
图 20为注射器第二实施例针座剖视图。
图 21为注射器芯杆立体图。 具体实施方式
下面参照附图， 对本发明进一步进行描述。
本发明为一种针座回拉式安全自锁式自毁注射器， 它包括注射器 筒体 6， 注射器筒体 6内设有芯杆 7， 芯杆 7靠近端部处套接有活塞 5， 注射器筒体 6端部的筒颈内设有针座， 针座外壁套接有密封圈 3， 其区别于现有技术在于： 所述针座 上部形成可换针头部， 针座的下 部腔体 内设有弹性支撑卡件 4， 该弹性支撑卡件 4内设有与芯杆端 部相配合的锁定咬合机构， 该锁定咬合机构具有弹性特质， 该弹性支 撑卡件 4外部形成与注射器筒体 6内腔内壁相配合的弹性支撑限位机 构， 芯杆端部形成与锁定咬合机构相配合的咬合部。
本发明另一实施例为： 一种针座回拉式安全自锁式自毁注射器， 它包括注射器筒体 6注射器筒体 6内设有芯杆 7， 芯杆 7靠近端部处 套接有活塞 5， 注射器筒体 6端部的筒颈内设有针座， 针座外壁套接 有密封圈 3， 其区别于现有技术在于： 所述针座下部腔体内设有弹性 支撑卡件 4， 该弹性支撑卡件 4内设有与芯杆端部相配合的锁定咬合 机构， 该锁定咬合机构具有弹性特质， 该弹性支撑卡件 4外部形成与 注射器筒体 6内腔内壁相配合的弹性支撑限位机构，芯杆端部形成与 锁定咬合机构相配合的咬合部。
在具体实施时， 所述可换针头部为带有导向齿毂的锥座 2， 该导 向齿毂的锥座 2的螺口能与 6: 100国际标准注射针头 1配合， 实现 注射器可换针头功能。
在具体实施时， 所述针座的下部腔体内壁处形成环状内凹槽 22， 针座外壁处设有环状外凹槽 23， 上述密封圈 3设置于环状外凹槽 23 内， 确保针座与筒体内壁之间的密封效果。
在具体实施时，所述导向齿毂的锥座 2外壁处呈环状均匀分布有 带导向功能的齿毂 21， 该导向结构能确保齿毂锥座在任意方向上都 能精确装配到注射器筒体内，从而在组装时能以很低成本实现全自动 化生产。
在具体实施时， 所述弹性支撑卡件 4呈近似中空圆柱形， 弹性支 撑卡件 4上部形成两片相互对称的弹性变形翼片 45, 弹性变形翼片 45上部外边缘处形成与环状内凹槽 22相配合的环形凸缘 41，两片弹 性变形翼片 45之间形成缺口 44， 该缺口 44下部的弹性支撑卡件 4 上表面形成两个相对称的弧形平台 47， 两个弧形平台 47处各设有一 棘爪片 43， 两片棘爪片 43相互对称， 两片棘爪片 43上端的延长线 形成夹角， 棘爪片 43 的两侧与弹性变形翼片 45 内侧之间形成间隙 46,两片相对的棘爪片 43构成了上述锁定咬合机构， 且棘爪片 43内 侧受力时会向外侧扩张， 具有弹性特质， 弹性支撑卡件 4下部设有圆 形卡片 48， 所述圆形卡片 48处设有若干切断间隙 481， 在具体实施 时可为四条切断间隙 481， 相邻的切断间隙 481之间成九十度夹角， 四条切断间隙 481成十字形分布， 圆形卡片 48被十字形分布四条切 断间隙 481分割成四片单独的卡爪 42。
在具体实施时， 所述注射器筒体 6端部的筒颈 内壁处形成与齿 毂 21数量配合的齿套 61， 齿毂与齿套相啮合的结构能防止注射时注 射针转动， 也就避免了因此带给患者带来的痛苦。 齿套 61下部的筒 颈 内壁处形成与卡爪 42相配合的环形止退槽 62， 注射器筒体 6下 部内壁处设有凸起状的自锁环 63。
在具体实施时， 所述芯杆 7的端部的咬合部为一环状凸台 701， 该环状凸台 701的外径大于两片棘爪片 43顶端之间的间距， 该环状 凸台 701下部的芯杆处形成环状卡槽 702, 环状卡槽 702下方的芯杆 处形成圆形限位片 703， 圆形限位片 703下部的芯杆处设有呈发散状 分布的翼齿片 704， 翼齿片 704与注射器筒体 6内的自锁环配合作用 时， 芯杆既不能前推也不能后拉， 活塞 5套接于环状卡槽 702和圆形 限位片 703之间的芯杆 7处, 活塞 5由圆形限位片 703限位固定。
在具体实施时， 所述环状凸台 701的直径大于两片棘爪片 43之 间的间距， 如此才能确保， 在芯杆回拉时， 芯杆端部的环状凸台 701 在两片棘爪片 43的端部之上， 实现芯杆与针座的卡合锁定效果。
在具体实施时， 所述芯杆 7处设有呈十字形分布的加强筋 705， 其中一加强筋 705处形成缺口 706， 该缺口处设有保护片 707， 保护 片 707的两端与缺口的两内侧壁点形成连接，保护片 707靠近中部处 形成折弯部 708， 折弯部 708处形成凸起 709。 装配完成时， 保护片 的凸起刚好抵住注射器筒体 6下端外缘， 使用时， 沿折弯部向内侧压 下保护片， 将保护片向内侧折弯， 使得凸起向内侧位移， 脱离射器筒 体 6下端外缘，注射器便可正常使用了， 此结构能有效防止注射器误 操作， 触发内部的安全机构， 导致注射器报废。
如图 7、 图 8、 图 9、 图 10、 图 11、 图 12和图 13所示， 为本发 明整个使用全过程。 图 8是抽液完成的平面结构剖视图， 在推液前， 先将保护片按下， 消除了芯杆前推的阻挡， 见图 9推液状态的平面结 构剖视图， 推液过程中， 防退针阻力是弹性支撑卡件的卡爪外圈与注 射器筒体的止退槽来实现的， 两者可实现的防退针阻力恰到好处， 可 实现阻退卡合力和回拉力的平衡结构。 当液体注射将要完成时， 芯杆 顶部的缩径斜面将弹性支撑卡件的两片棘爪缓缓向两侧撑开，一越过 棘爪上端面， 棘爪即卡入芯杆的卡槽内， 并完成注射， 如图 10所示。
注射完毕后回拉芯杆， 如图 11所示， 在芯杆的卡槽与棘爪之间 咬合状态的作用下将弹性支撑卡件带动一起向下运动， 同时， 弹性支 撑卡件的卡爪在发生折弯， 使得卡爪的外周直径变小， 也就顺利从外 套的止退槽中脱开。再继续向下拉芯杆， 当弹性支撑卡件的环形凸缘 下端面接触到齿毂锥座的内凹槽下端面后，芯杆将带动含通用注射针 的整个针座运动， 直到芯杆的翼齿片越过注射器筒体的自锁环， 芯杆 的圆形限位片和翼齿片将注射器筒体的自锁环卡死在之间， 此时， 芯 杆既不能回拉也不能前推， 如图 12所示， 此时， 整个针头部都内缩 到针筒里面， 并实现了安全自锁。 如图 13中所示， 最后稍用力于自 毁点， 使芯杆被折断或拉断， 将芯杆的头部毁于外套 内。
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
1.一种针座回拉式安全自锁式自毁注射器， 它包括注射器筒体 (6), 注射器筒体（6) 内设有芯杆（7)， 芯杆（7)靠近端部处套接 有活塞 （5 )， 注射器筒体 （6) 端部的筒颈内设有针座， 针座外壁套 接有密封圈 （3 )， 其特征在于： 所述针座上部形成可换针头部， 针座 的下部腔体内设有弹性支撑卡件 （4)， 该弹性支撑卡件 （4) 内设有 与芯杆端部相配合的锁定咬合机构， 该锁定咬合机构具有弹性特质， 该弹性支撑卡件（4)外部形成与注射器筒体（6) 内腔内壁相配合的 弹性支撑限位机构， 芯杆端部形成与锁定咬合机构相配合的咬合部。
2.—种针座回拉式安全自锁式自毁注射器， 它包括注射器筒体 (6)， 注射器筒体（6) 内设有芯杆（7), 芯杆（7)靠近端部处套接 有活塞 （5 )， 注射器筒体 （6) 端部的筒颈内设有针座， 针座外壁套 接有密封圈（3 )， 其特征在于： 所述针座下部腔体内设有弹性支撑卡 件 （4)， 该弹性支撑卡件 （4) 内设有与芯杆端部相配合的锁定咬合 机构， 该锁定咬合机构具有弹性特质， 该弹性支撑卡件 （4) 外部形 成与注射器筒体 （6) 内腔内壁相配合的弹性支撑限位机构， 芯杆端 部形成与锁定咬合机构相配合的咬合部。
3.根据权利要求 1 所述的一种针座回拉式安全自锁式自毁注射 器， 其特征在于： 所述可换针头部为带有导向齿毂的锥座（2)， 该导 向齿毂的锥座 （2) 的螺口能与注射针头 （1 ) 配合。
4.根据权利要求 1 所述的一种针座回拉式安全自锁式自毁注射 器， 其特征在于： 所述针座的下部腔体内壁处形成环状内凹槽（22), 针座外壁处设有环状外凹槽（23)， 上述密封圈 （3)设置于环状外凹 槽 （23) 内。
5.根据权利要求 3 所述的一种针座回拉式安全自锁式自毁注射 器， 其特征在于： 所述导向齿毂的锥座 （2) 外壁处呈环状均匀分布 有带导向功能的齿毂 （21)。
6.根据权利要求 1 所述的一种针座回拉式安全自锁式自毁注射 器， 其特征在于： 所述弹性支撑卡件 （4) 呈近似中空圆柱形， 弹性 支撑卡件（4)上部形成两片相互对称的弹性变形翼片 （45)， 弹性变 形翼片（45)上部外边缘处形成与环状内凹槽（22)相配合的环形凸 缘（41)， 两片弹性变形翼片（45)之间形成缺口 （44)， 该缺口 （44) 下部的弹性支撑卡件 （4) 上表面形成两个相对称的弧形平台 （47)， 两个弧形平台 （47) 处各设有一棘爪片 （43)， 两片棘爪片 （43) 相 互对称， 两片棘爪片 （43)上端的延长线形成夹角， 棘爪片 （43) 的 两侧与弹性变形翼片 （45) 内侧之间形成间隙 （46)， 弹性支撑卡件
(4)下部设有圆形卡片 （48)， 所述圆形卡片（48)处设有若干条切 断间隙 （481)， 圆形卡片 （48) 被若干切断间隙 （481) 分割成相应 的单独的卡爪 （42)。
7.根据权利要求 1所述的一种针座回拉式安全自锁式自毁注射器， 其特征在于:所述注射器筒体 (6)端部的筒颈 内壁处形成与齿毂 (21) 数量配合的齿套（61 )，齿套（61 )下部的筒颈内壁处形成与卡爪（42) 相配合的环形止退槽（62)， 注射器筒体（6)下部内壁处设有凸起状 的自锁环 （63)。
8.根据权利要求 1所述的一种针座回拉式安全自锁式自毁注射器, 其特征在于： 所述芯杆 （7) 的端部的咬合部为一环状凸台 （701 )， 该环状凸台 （701 ) 的外径大于两片棘爪片 （43 ) 顶端之间的间距， 该环状凸台（ 701 )下部的芯杆处形成环状卡槽（ 702 )，环状卡槽（ 702 ) 下方的芯杆处形成圆形限位片 （703 )， 圆形限位片 （703) 下部的芯 杆处设有呈发散状分布的翼齿片 （704)， 活塞 （5 ) 套接于环状卡槽 (702) 和圆形限位片 （703) 之间的芯杆 （7) 处。
9.根据权利要求 1 所述的一种针座回拉式安全自锁式自毁注射 器，其特征在于：所述芯杆（7 )处设有呈十字形分布的加强筋（705)， 其中一加强筋（705)处形成缺口（706 )，该缺口处设有保护片（707)， 保护片 （707) 的两端与缺口的两内侧壁点形成连接， 保护片 （707) 靠近中部处形成折弯部 （708)， 折弯部 （708 ) 处形成凸起 （709)。
u
PCT/CN2012/000739 2012-04-27 2012-05-28 一种针座回拉式安全自锁式自毁注射器 WO2013159254A1 (zh)

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