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WO2012167605A1 - 一种用于安全自毁式注射器的内针座结构 - Google Patents

一种用于安全自毁式注射器的内针座结构 Download PDF

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Publication number
WO2012167605A1
WO2012167605A1 PCT/CN2012/000760 CN2012000760W WO2012167605A1 WO 2012167605 A1 WO2012167605 A1 WO 2012167605A1 CN 2012000760 W CN2012000760 W CN 2012000760W WO 2012167605 A1 WO2012167605 A1 WO 2012167605A1
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WO
WIPO (PCT)
Prior art keywords
annular
base
needle seat
inner needle
elastic sealing
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/CN2012/000760
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English (en)
French (fr)
Inventor
王祖扬
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.)
BIOTOP TECHNOLOGY (SHANGHAI) Co Ltd
Original Assignee
BIOTOP TECHNOLOGY (SHANGHAI) Co Ltd
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Publication date
Application filed by BIOTOP TECHNOLOGY (SHANGHAI) Co Ltd filed Critical BIOTOP TECHNOLOGY (SHANGHAI) Co Ltd
Publication of WO2012167605A1 publication Critical patent/WO2012167605A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • A61M5/3293—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 characterised by features of the needle hub
    • 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
    • A61M2005/3223—Means impeding or disabling repositioning of used needles at the syringe nozzle
    • A61M2005/3224—Means to disalign the needle tip and syringe nozzle
    • 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
    • A61M5/34—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
    • A61M5/343—Connection of needle cannula to needle hub, or directly to syringe nozzle without a needle hub

Definitions

  • Inner needle seat structure for safe self-destructing syringe
  • the present invention relates to the technical field of medical devices, and more particularly to an inner needle hub structure for a safe self-destructing syringe, and more particularly to a mechanical connection structure thereof.
  • the outer wall of the needle seat is provided with an annular convex rib, and is closely attached to the convex edge of the top end of the inner cavity of the cylinder neck.
  • the needle is placed between the inner and outer walls of the needle seat, and the inner end of the core rod is provided with an inner hole, and one end of the barb is placed In the inner hole, the upper part of the core rod is provided with a mounting groove, and a sealing ring is built therein.
  • the middle part of the core rod is set as a six-piece body, a guiding groove is arranged between the sheet bodies, and a positioning piece is embedded in the bottom of the outer casing. Inside the slot. Comparative Document 2, Patent No.: ZL200720067715. 4, Application Date: 2007. 03.
  • the core rod includes: a core rod body, a columnar fastener is disposed at an upper end portion of the core rod body, and a rubber plug is sleeved at the columnar fastener member, wherein: the rubber plug is provided with a mounting hole, and the mounting hole is provided with a pouring Hook body.
  • Comparison Document 3 Patent No.: ZL 200720075476. 7, Application Date: 2007.
  • 10. 16 Announcement No.: CN201101783, Patentee: Shanghai Top Tang Biochemical Technology Co., Ltd.
  • the present invention discloses a "safety self-destructing syringe", comprising: a cylinder body, the end of the cylinder body is a cylinder neck, a needle seat is arranged in the cylinder neck, a needle tube is arranged in the needle seat body, and a core rod is arranged in the cylinder body cavity,
  • the end of the core rod is provided with a rubber plug, wherein: the top end of the core rod is provided with a mounting hole, and the mounting hole is provided with an S-shaped pull-back hook, and the S-shaped pull-back hook is composed of an upper hook body and a lower hook body, and the lower body body Placed in the mounting hole, the lower hook body is V-shaped, and one side arm of the lower hook body is vertical, and is parallel with the inner wall of the mounting hole and closely adheres to the inner wall of the mounting hole, and the upper hook body is inverted V-shaped, and the upper hook body is The side arm and the one side arm of the lower hook body are at an angle of less than
  • the utility model comprises: a cylinder body, a core rod is arranged in the cylinder body, a rubber plug is arranged near the end of the core rod, a needle is arranged in the cylinder neck of the cylinder body, and a needle tube is arranged at the needle head, wherein: the core rod end portion
  • the side wall of the rod body is provided with a lateral notch, the transverse notch is in communication with the longitudinal notch at the end of the mandrel rod, the transverse notch is matched with the longitudinal notch, and the needle is sleeved by the upper needle seat and the lower needle seat, and the lower needle seat is sleeved
  • the cavity is hollow, the lower needle seat has a cylindrical structure, and the lower needle seat is
  • a safe syringe including: The cylinder body is provided with a core rod, a rubber plug is sleeved at the core rod, and a needle seat is arranged in the cylinder neck of the cylinder body, and the needle seat end portion is provided
  • the utility model has a needle tube, wherein: the core rod end is provided with a safety pull-back lock cylinder body, and the outer wall of the safety return lock cylinder body is provided with an upper limit locking ring and a lower limit locking ring from top to bottom, the cylinder body
  • the upper end of the cylinder neck is provided with a top safe pull-back needle seat and a lower safety pull-back base from top to bottom, and the upper safe pull-back needle seat and the lower safety pull-back base are annular, and the safety pull-back lock cylinder
  • the above-mentioned comparative documents disclose several typical needle-seat pull-back safety syringes and safety self-destructing syringes, the basic principle of which is to use the core after the partial pull-in part provided at the end of the core rod and the needle seat in the syringe are partially engaged.
  • the pull-back force of the rod pulls the needle head back into the inner body of the syringe barrel for safe or safe self-destruction.
  • the pull-back member of the end of the core rod generally adopts two forms, one of which is a metal barb, and the partial locking of the barb body and the inner needle seat is realized by utilizing the elastic property of the metal piece, and the second is a column pull-back piece.
  • a protruding snap-locking structure is arranged on the outer surface of the column, and cooperates with the inner structure of the inner needle seat to realize partial locking with the inner needle seat.
  • the original design of the existing inner needle seat pull-back safety or safety self-destructing syringe adopts a single inner needle seat structure, but in actual tests, it is found that when the inner needle seat and the cylinder neck meet the standard of engagement The pullback force required for the inner needle seat to be pumped back is large, which makes the syringe unable to achieve safe operation. When the required pullback force of the inner needle seat reaches the desired value, the inner needle seat and the neck of the cylinder barrel are engaged. And the sealing effect is not ideal.
  • the syringe is generally designed with an upper and lower double needle seat structure, the upper needle seat realizes the engagement function with the neck of the syringe barrel, the lower needle seat realizes the engagement function with the pullback member, the upper needle seat and the lower needle
  • the seats are connected by a nip.
  • the upper and lower needle holders have higher mold cost, and the mold opening process is more complicated, and often cannot be demoulded once, and second demoulding is required.
  • the upper and lower split type needle holders are prone to assembly errors, resulting in product scrapping. At the same time, the assembly difficulty is increased.
  • the upper and lower split type needle holders are prone to malfunction in operation and the stability of the working state of the syringe. Poor.
  • the object of the present invention is to provide an inner needle seat structure for a safety self-destructing syringe, which adopts a single inner needle seat structure, and the inner needle seat portion forms a buffer zone with elastic expansion and contraction function, which overcomes the characteristic band of the material itself.
  • the elastic buffer can ensure the bite force and tightness between the inner needle seat and the neck, and reduce the pulling force required when the inner needle seat is pulled back when the inner needle seat is pulled back, so that The two key elements of the contradiction achieve an optimal balance point.
  • the one-piece inner needle seat can be demoulded at one time, and the working state is stable, which overcomes the shortcomings and deficiencies in the prior art.
  • an inner needle seat structure for a safe self-destructing syringe which comprises an inner needle seat body, and the lower end of the inner needle seat body is provided with a back
  • the locking cavity is characterized in that: the inner needle seat body is provided with a needle tube base, and an elastic sealing limit base integrally formed with the needle tube base, and the two are integrated into a single structure, the needle base
  • An annular step or an annular slope is formed between the elastic sealing limit base and the annular sealing gap is formed on the surface of the elastic sealing limit base, and the outer side of the elastic sealing limit base on the outer side of the annular buffer gap is formed into a ring shape. Seal the limit engagement part.
  • An inner needle seat structure for a safety self-destructing syringe comprising an inner needle seat body, wherein a lower end of the inner needle seat body is provided with a pull-back locking cavity, wherein: the inner needle seat body is provided with a needle base And an elastic sealing limit base with a component structure of the needle base, the two components are assembled, the annular base or the annular slope is formed between the needle base and the elastic sealing limit base, and the elastic sealing limit An annular buffer gap is formed on the surface of the base, and an annular sealing limit engagement portion is formed on the outer wall of the elastic sealing limit base outside the annular buffer gap.
  • the invention discloses an inner needle seat structure for a safe self-destructing syringe.
  • the annular inner cushion seat is provided with an annular buffer gap, which overcomes the defects caused by the material itself, and the elastic buffer can ensure the inner needle.
  • the seat can be injection molded at one time, which effectively reduces the manufacturing cost and simplifies the manufacturing process.
  • the "0"-shaped sealing rubber ring can ensure the complete sealing effect of the inner needle seat and the neck of the syringe barrel.
  • the finished syringe is easy to operate in practical use.
  • the working condition is stable, has good practicability, and has outstanding substantive features and significant progress compared to the prior art.
  • Figure 1 is a schematic view showing the structure of a first embodiment of the present invention.
  • 2 is a schematic structural view of a second embodiment of the present invention.
  • Fig. 3 is a view showing an initial state of the first embodiment of the present invention.
  • Fig. 4 is a view showing the state of use of the first embodiment of the present invention.
  • Fig. 5 is a diagram showing the safety self-destruction of the first embodiment of the present invention.
  • Figure 6 is a diagram showing an initial state of a second embodiment of the present invention.
  • Figure 7 is a diagram showing the state of use of the second embodiment of the present invention.
  • Figure 8 is a diagram showing the safety self-destruction of the second embodiment of the present invention.
  • Figure 9 is a schematic view showing the structure of the cylinder of the present invention.
  • the invention is a structure of an inner needle seat for a safe self-destructing syringe.
  • FIG. 1 it is a schematic structural view of a first embodiment of the present invention, which mainly comprises an inner needle body 1 and a lower end of the inner needle body 1 .
  • the pull-back locking cavity 2 is opened, which is different from the prior art in that: the inner needle seat body 1 is provided with a needle base 3, and an elastic sealing limit base 4 integrally formed with the needle base 3; The two are integrated into a single structure, and the needle base 9 is provided at the end of the needle base 3, and an annular step 7 or an annular slope is formed between the needle base 3 and the elastic sealing limit base 4, and the annular step 7 or the annular slope surface is sleeved with an "O"-shaped sealing rubber ring 10, and the surface of the elastic sealing limit base 4 is provided with an annular buffer gap 5, that is, an annular groove or an approximate structure, and the elasticity of the outer side of the annular buffer gap 5 An annular seal limit engagement portion 6 is formed at the outer wall of the seal limiting base 4, that is, an annular seal limit rib or an approximate structure.
  • an inner needle seat structure of another structure is disclosed, and the positions of the annular buffer gap 5 and the annular seal limit engagement portion 6 are raised upward.
  • This structure is generally suitable for small size syringes.
  • the third embodiment of the present invention mainly includes an inner needle hub body 1.
  • the lower end of the inner needle hub body 1 is provided with a pull-back locking cavity 2, which is different from the prior art in that:
  • the needle base 3 and the elastic sealing limit base 4 of the body structure of the needle base 3 are combined, and the two parts are assembled, and the annular base 7 is formed between the needle base 3 and the elastic sealing limit base 4.
  • an annular slope surface, the annular step 7 or the annular slope surface is sleeved with an "O"-shaped sealing rubber ring 10
  • the surface of the elastic sealing limit base 4 is provided with an annular buffer gap 5, and an annular buffer gap 5
  • the outer sealing portion of the outer elastic sealing limit base 4 forms an annular sealing limit engaging portion 6.
  • the height of the annular buffer gap 5 from the notch to the bottom of the groove is 0.1 mm-20 mm
  • the width of the annular buffer gap 5 is 0.1 mm-20 mm
  • the outer buffer wall of the annular buffer gap 5 and the annular seal The distance between the arcuate top of the surface of the limiting engaging portion 6 is 0.1 mm-20 mm, and the distance between the outer groove wall of the annular buffering gap 5 and the outer wall of the annular sealing limit engaging portion 6 is 0.1 mm-20 mm.
  • the distance between the bottom of the outer groove wall of the annular buffer gap 5 and the outer wall of the annular seal limiting engagement portion 6 is 0.1 mm to 20 mm.
  • the surface of the annular seal limiting engaging portion 6 is curved, and the distance from the top of the arc to the edge of the curved surface is smaller than the distance from the top of the arc to the lower edge of the curved surface.
  • annular recess 8 is formed at an outer wall of the elastic sealing limit base 4 at the lower portion of the sealing limiting rib 6 , and the annular recess 8 is located on the same horizontal plane as the groove bottom of the annular buffer gap 5 or The bottom of the groove is higher than the annular buffer gap 5.
  • the upper surface of the elastic sealing limit base 4 is provided with an annular buffer gap 5 .
  • an annular buffer gap 5 is defined in a lower surface of the elastic sealing limit base 4 .
  • the needle base 3 is cylindrical, and the elastic sealing limit base 4 is disposed at the bottom of the needle base 3, and the two form a unitary single structure or a split assembly structure.
  • the needle base 3 is cylindrical
  • the elastic sealing limit base 4 is disposed at the middle portion of the cylinder base 3 cylinder, and the two form a unitary single structure or a split assembly structure.
  • the needle base 3 is cylindrical, and the elastic sealing limit base 4 is disposed at the top of the needle base 3, and the two form a unitary single structure or a split assembly structure.
  • a plurality of notches or cut lines are formed at the annular seal limit engaging portion 6 of the outer wall of the elastic seal retaining base 4.
  • the inner needle body 1 is assembled from the rear portion into the inner body of the syringe barrel, and the buffer zone is an annular buffer gap 5 and a ring.
  • the sealing position limiting engaging portion 6 is disposed at the inner needle seat near the lower end, and the outer diameter of the annular sealing limit engaging portion 6 is smaller than the inner diameter of the cylindrical neck, but the ring buffer gap 5 is provided, so the ring
  • the outer portion of the annular seal limiting portion 6 is curved, so that the guiding effect is obtained.
  • the syringe is used, the core rod is pushed forward, the metal barb body at the end of the core rod is displaced forward, and the end of the metal barb body forms a curved turn-back portion, and the width of the meandering portion is slightly Less than or equal to the diameter of the inner cavity of the pull-back locking cavity 2, so that the end of the barb body easily enters the pull-back locking cavity 2, and the rear width of the metal barb body is larger than the inner diameter of the pull-back locking cavity 2
  • the end portion of the twisted portion has an elastic characteristic, the elastic arm of both sides of the metal barb is bent and the inner side of the twisted portion is easily deflected toward the inner side. At this time, the inner angle of the rounded portion becomes small, and thus, the metal barb The body can be fully inserted into the pull-back locking cavity.

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  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
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Abstract

一种用于安全自毁式注射器的内针座结构，其特征在于：所述内针座本体（1）处设有针管基座（3），和与针管基座（3）成一体结构的弹性密封限位基座（4）构成，两者成一体式单体结构或分体式装配结构，针管基座（3）与弹性密封限位基座（4）之间形成环状台阶（7）或环状坡面，弹性密封限位基座（4）表面开设有环状缓冲间隙（5），环状缓冲间隙（5）外侧的弹性密封限位基座（4）外壁处形成环状密封限位卡合部（6），产品克服了材质本身特性带来的缺陷，弹性缓冲区能确保内针座与筒颈之间的咬合力和密封性，并在内针座回抽时减少内针座回拉时所需的拉力，使得本身矛盾的两个关键要素达到一个最佳平衡点。

Description

说 明 书
一种用于安全自毁式注射器的内针座结构 技术领域
本发明涉及医疗器械的技术领域，具体的说是一种用于安全自毁 式注射器的内针座结构， 特别涉及其机械连接结构。
背景技术
对比文件一，专利号： ZL200410017938. 0, 申请日： 2004. 04. 26, 公告号： CN1689654, 专利权人： 上海顶尖堂生化科技有限公司， 本 案公开了 "一种损毁式安全注射器"， 包括： 外套、 外套上端的筒颈 及针 头、 外套内的芯杆， 其特征是： 筒颈的内腔顶端设有凸边， 筒 颈的内 腔内置一针头座， 针头座的内壁为圆柱孔， 针头座的外壁设 有环状凸 筋， 并与筒颈内腔顶端的凸边紧贴， 针头置于针头座的内、 外壁之间， 芯杆的顶部设有内孔， 倒钩的一端置于内孔内， 芯杆的上 部设有安装槽， 其内置一密封圈， 芯杆的中部设为六片状体， 片状体 之间设一导向槽， 外套的底部设一定位片嵌入导向槽内。 对比文件二，专利号： ZL200720067715. 4, 申请日： 2007. 03. 08， 公告号： CN201076648, 专利权人： 上海顶尖堂生化科技有限公司， 本案公开了 "一种带有金属钩件结构的芯杆"， 包括： 芯杆体， 芯杆 体的上端部设有柱状扣件， 柱状扣件处套接有胶塞， 其特征在于： 所 述胶塞处设有安装孔， 安装孔内设有倒钩体。 对比文件三，专利号： ZL 200720075476. 7, 申请日： 2007. 10. 16， 公告号： CN201101783 , 专利权人： 上海顶尖堂生化科技有限公司， 本案公开了 "一种安全自毁式注射器"， 包括： 筒体， 筒体的 端部为 筒颈， 筒颈内设有针头座， 针头座内设有 针管， 筒体内腔设有芯杆， 芯杆端部设有胶塞， 其特征在于： 所述芯杆的顶端设有安装孔， 安装 孔内 设有 S形回拉钩， S形回拉钩由上钩体和下钩体构成， 下构体 置于安装孔内， 下钩体成 V字型， 下钩体的一侧臂成垂直状， 且与安 装孔内壁平行并紧贴安装孔内壁， 上钩体成倒 V字型， 上钩体的一 侧臂与上 述下钩体的一侧臂成小于 180度大于 90度的夹角，上钩体 成倒 V字型， 其双臂之间的最大宽度大于针头座内腔内直径， 而下 钩体成 V字型， 其双臂之间的最大宽度大于安装孔内腔宽度。 对比文件四，专利号： ZL200720075475. 2, 申请日： 2007. 10. 16， 公告号： CN201101782, 专利权人： 上海顶尖堂生化科技有限公司， 本案公开了 "一种安全自毁式疫苗注射器"， 包括： 筒体， 筒体内设 有芯杆， 芯杆靠近端部处设有胶塞， 筒体的 筒颈内设有针头， 针头 处设有针管， 其特征在于： 所述芯杆端部的杆体侧壁设有横向缺口， 横向缺口与 芯杆端部杆体处的纵向缺口相联通， 横向缺口与纵向缺 口相配合， 针头由上针座和下针座套接而成， 下针座内腔中空， 下 针座成筒状结构， 下针座相 对于安装上针头座的另一端开口处内壁 设有下针头座凸筋。
对比文件五， 专利申请号： ZL200910048684. 1， 申请日： 2009. 04. 01 , 公告号： CN101850141A, 专利权人： 江苏亿乐医疗用品 有限公司， 本案公开了 "一种安全注射器"， 包括： 筒体， 筒体设有 芯杆， 芯杆处套接有胶塞， 筒体的筒颈内设有针头座， 针头座端部设 有针管， 其特征在于： 所述芯杆端部设有安全回拉锁柱体， 安全回拉 锁柱体的外壁处自上而下依次设有上限位锁紧环和下限位锁紧环，筒 体端部的筒颈内自上而下依次设有上安全回拉针头座和下安全回拉 底座， 上安全回拉针头座和下安全回拉底座均呈环状， 安全回拉锁柱 体可贯穿于上安全回拉针头座和下安全回拉底座中心位。 上述对比文件中公开了几种比较典型的针座回拉式安全注射器 和安全自毁注射器，其基本原理是利用设置在芯杆端部的回拉部件与 注射器内针座局部咬合后，利用芯杆的回拉力将针头部整体拉回至注 射器筒体内腔， 实现安全或安全自毁效果。 芯杆端部的回拉部件一般采用两种形式， 其一， 为金属倒钩， 利 用金属件的弹性特性， 实现倒钩体与内针座的局部锁定， 其二， 为柱 体回拉件，一般在柱体外表面设有凸出的咬合锁定结构， 与内针座内 部结构相配合， 实现与内针座的局部锁定。 现有的此类内针座回拉式安全或安全自毁式注射器的原始设计 是采用单体内针座结构，但在实际测试中发现， 当内针座与筒体筒颈 部达到卡合标准时， 内针座回抽时所需的回拉力较大， 导致注射器无 法实现安全操作， 而当内针座所需的回拉力达到理想值时， 内针座与 筒体筒颈部的卡合效果和密封效果又不甚理想，由于现有单体内针座 自身结构上存在的缺陷和材质本身的特性，始终无法达到卡合力和回 拉力之间的平衡点。 基于上述原因，研发出一种分体式双针座回拉式安全或安全自毁 式注射器，其设计时一般采用上下双针座结构， 上针座实现与注射器 筒体筒颈部的卡合功能， 下针座实现与回拉部件之间的咬合功能， 上 针座和下针座之间利用咬合部进行连接。 分体式内针座在实际生产和使用中存在诸多问题， 其一， 上下针 座的模具成本较高， 开模工艺比较复杂， 往往无法一次脱模成型， 需 要进行二次脱模， 其二， 上下分体式针座在装配工序时， 容易出现装 配误差， 导致产品报废， 同时， 增加了装配难度， 其三， 上下分体式 针座在实际使用中， 容易出现操作失灵，注射器的工作状态稳定性较 差。 综上所述，仍然需要对现有针座回拉式安全或安全自毁式注射器 的结构进行进一步改进， 研发出一种能够同时满足卡合力和回拉力， 并具有密封效果的单体内针座结构。 发明内容
本发明的目的在于提供一种用于安全自毁式注射器的内针座结 构， 其采用单体式内针座结构， 内针座部形成具有弹性伸縮功能的缓 冲区， 克服了材质本身特性带来的缺陷， 在实施使用中， 弹性缓冲区 能确保内针座与筒颈之间的咬合力和密封性，并在内针座回抽时减少 内针座回拉时所需的拉力，使得本身矛盾的两个关键要素达到一个最 佳平衡点， 此一体式内针座可一次脱模成型， 工作状态稳定， 克服了 现有技术中存在的缺点和不足。
为了实现上述目的， 本发明的技术方案是： 一种用于安全自毁式 注射器的内针座结构， 它包括内针座本体， 内针座本体下端开设有回 拉锁定腔， 其特征在于： 所述内针座本体处设有针管基座， 和与针管 基座成一体结构的弹性密封限位基座构成， 两者成一体式单体结构， 针管基座与弹性密封限位基座之间形成环状台阶或环状坡面，弹性密 封限位基座表面开设有环状缓冲间隙，环状缓冲间隙外侧的弹性密封 限位基座外壁处形成环状密封限位卡合部。
一种用于安全自毁式注射器的内针座结构， 它包括内针座本体， 内针座本体下端开设有回拉锁定腔，其特征在于： 所述内针座本体处 设有针管基座， 和与针管基座成分体结构的弹性密封限位基座构成， 两者成分体式装配结构，针管基座与弹性密封限位基座之间形成环状 台阶或环状坡面， 弹性密封限位基座表面开设有环状缓冲间隙， 环状 缓冲间隙外侧的弹性密封限位基座外壁处形成环状密封限位卡合部。
本发明公开了一种用于安全自毁式注射器的内针座结构，单体式 内针座内设置了环状缓冲间隙， 克服了材质本身特性带来的缺陷， 弹 性缓冲区能确保内针座与筒颈之间的咬合力和密封性，并在内针座回 抽时减少内针座回拉时所需的拉力，使得本身矛盾的两个关键要素达 到一个最佳平衡点， 内针座可一次注塑成型， 有效减低了制造成本， 简化了制造工序， 与配合 "0"形密封橡圈能确保内针座与注射器筒 颈部的完全密封效果， 成品注射器在实际使用中操作简便， 工作 状态稳定， 具有很好的实用性， 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结构示意图。 图 2为本发明第二实施例结构示意图。
图 3为本发明第一实施例初始状态图。
图 4为本发明第一实施例使用状态图。
图 5为本发明第一实施例安全自毁状图。
图 6为本发明第二实施例初始状态图。
图 7为本发明第二实施例使用状态图。
图 8为本发明第二实施例安全自毁状图。
图 9为本发明筒体结构示意图。
具体实施方式
下面参照附图， 对本发明进一步进行描述。
本发明为一种用于安全自毁式注射器的内针座结构，如图 1中所 示， 为本发明第一实施例结构示意图， 它主要包括内针座本体 1， 内 针座本体 1下端开设有回拉锁定腔 2， 其区别于现有技术在于： 所述 内针座本体 1处设有针管基座 3， 和与针管基座 3成一体结构的弹性 密封限位基座 4构成， 两者成一体式单体结构， 针管基座 3端部设有 针管 9， 针管基座 3与弹性密封限位基座 4之间形成环状台阶 7或环 状坡面， 所述环状台阶 7或环状坡面处套接有 "O"形密封橡圈 10， 弹性密封限位基座 4表面开设有环状缓冲间隙 5， 即环形槽或近似结 构，环状缓冲间隙 5外侧的弹性密封限位基座 4外壁处形成环状密封 限位卡合部 6, 即环状密封限位凸筋或近似结构。
在本发明第二实施例中， 如图 2中所示， 公开了另一种结构的内 针座结构，环状缓冲间隙 5和环状密封限位卡合部 6的位置向上提升， 此结构一般适用于小规格的注射器。
在本发明第三实施例中， 它主要包括内针座本体 1， 内针座本体 1下端开设有回拉锁定腔 2， 其区别于现有技术在于： 所述内针座本 体 1处设有针管基座 3， 和与针管基座 3成分体结构的弹性密封限位 基座 4构成， 两者成分体式装配结构， 针管基座 3与弹性密封限位基 座 4之间形成环状台阶 7或环状坡面，所述环状台阶 7或环状坡面处 套接有 "O"形密封橡圈 10， 弹性密封限位基座 4表面开设有环状缓 冲间隙 5， 环状缓冲间隙 5外侧的弹性密封限位基座 4外壁处形成环 状密封限位卡合部 6。
在具体实施时， 所述环状缓冲间隙 5 槽口至槽底的高度为 0.1mm-20mm, 环状缓冲间隙 5的宽度为 0.1mm-20mm， 环状缓冲间 隙 5 外侧槽壁与环状密封限位卡合部 6 表面弧面弧顶的距离为 0.1mm-20mm, 环状缓冲间隙 5外侧槽壁槽口处与环状密封限位卡合 部 6外壁之间的距离为 0.1mm-20mm，环状缓冲间隙 5外侧槽壁槽底 处与环状密封限位卡合部 6外壁之间的距离为 0.1mm-20mm。
在具体实施时， 环状密封限位卡合部 6的表面成弧面状，其弧顶 至弧面上边缘的距离小于弧顶至弧面下边缘的距离。
在具体实施时， 所述密封限位凸筋 6下部的弹性密封限位基座 4 外壁处形成环状凹陷 8， 所述环状凹陷 8与上述环状缓冲间隙 5的槽 底位于同一水平面或高于环状缓冲间隙 5的槽底。
在具体实施时，所述弹性密封限位基座 4上表面开设有环状缓冲 间隙 5。 在具体实施时，所述弹性密封限位基座 4下表面开设有环状缓冲 间隙 5。
在具体实施时， 所述针管基座 3成柱体状， 弹性密封限位基座 4 设置于针管基座 3底部处，两者形成一体式单体结构或分体式装配结 构。
在具体实施时， 所述针管基座 3成柱体状， 弹性密封限位基座 4 设置于针管基座 3柱体中段处，两者形成一体式单体结构或分体式装 配结构。
在具体实施时， 所述针管基座 3成柱体状， 弹性密封限位基座 4 设置于针管基座 3顶部处，两者形成一体式单体结构或分体式装配结 构。
在具体实施时，所述弹性密封限位基座 4外壁的环状密封限位卡 合部 6处形成若干缺口或切断线。
如图 3中所示， 为本发明第一实施例所述内针座的装配图， 内针 座本体 1被从后部组装入注射器筒体内腔，其缓冲区即环状缓冲间隙 5和环状密封限位卡合部 6被设置于内针座靠近下端处， 环状密封限 位卡合部 6的外直径小于筒体筒颈内直径，但由于设置了环状缓冲间 隙 5， 故环状密封限位卡合部 6在受到筒颈内壁的压力时， 会向中心 位受压产生细微的变形， 而故环状密封限位卡合部 6 的外表面成弧 面， 故具有导向效果， 使得内针座组装入筒颈内时十分顺滑， 筒颈内 设置有与环状密封限位卡合部 6相配合的环状密封限位凹陷 11， 当 环状密封限位卡合部 6被位移至此处时，环状密封限位卡合部 6刚好 滑入环状密封限位凹陷 11 内， 此时， 作用于环状密封限位卡合部 6 的压力消失或部分消失， 环状密封限位卡合部 6进行复位变形， 与环 状密封限位凹陷 Π卡合， 环状密封限位卡合部 6外壁紧贴环状密封 限位凹陷 11 内壁， 实现内针座与筒颈处的限位密封效果， 如图中所 示， 筒体 13内设有芯杆 12, 芯杆 12的端部套接有胶塞 14， 芯杆 12 的端部组装有金属倒钩体 15。
如图 4中所示， 注射器开始使用， 向前推动芯杆， 芯杆端部的金 属倒钩体向前发生位移， 金属倒钩体的端部形成一弯曲的迂回部，迂 回部的宽度略小于或等于回拉锁定腔 2的内腔直径，故倒钩体的端部 很容易进入回拉锁定腔 2内，而， 金属倒钩体的后部宽度虽大于回拉 锁定腔 2的内直径， 但由于端部的迂回部具有弹性特征， 故金属倒钩 的顶端弯曲迂回部两侧弹性臂很容易受压向内侧偏转， 此时，迂回部 的内夹角变小， 如此， 金属倒钩体便可完全插入回拉锁定腔内。
如图 5中所示， 金属倒钩体进入回拉锁定腔内后， 因为金属件具 有弹性特征，而金属倒钩体顶端迂回部内夹角变小后会向外侧施加反 向作用力，此反向作用力通过金属倒钩两侧弹性臂传到至回拉锁定腔 内壁处， 此时， 向后拉动芯杆， 由于， 金属倒钩体的一弹性臂的端部 悬空， 而另一弹性臂的端部形成反向的折角， 导致金属倒钩并非完全 垂直插入回拉锁定腔内， 插入时会产生略微的偏斜， 故弹性臂的悬空 端与回拉锁定腔内壁的夹角会略大， 拉动芯杆时， 金属倒钩体被反向 拉动， 弹性臂的悬空端很容易插入回拉锁定腔内壁， 此时， 芯杆端部 依靠金属倒钩体将内针座牢牢锁定，顺势拉动芯杆，将内针座从筒体 的筒颈内带出，由于环状密封限位卡合部 6外部下边缘的弧面弧度较 缓， 故向中心受压变形后很容易从环状密封限位凹陷内脱出， 继续向 后拉动芯杆， 直至整个针头部完全拉入筒体内腔， 由于弹性臂下端部 形成的反向折角会使针头部向一侧偏转， 导致针管完全偏离筒颈，针 头部无法再次从新装配到筒颈内， 此时， 再向前推动芯杆， 将针管端 部顶弯， 如此变完成了注射器的整个安全自毁操作。
以上内容是结合具体的优选实施方式对本发明所作的进一步详 细说明， 不能认定本发明具体实施只局限于上述这些说明。对于本发 明所属技术领域的普通技术人员来说， 在不脱离本发明构思的前提 下，还可以做出若干简单推演或替换， 都应当视为属于本发明的保护 范围。

Claims

权 利 要 求 书
1.一种用于安全自毁式注射器的内针座结构， 它包括内针座本体 (1)， 内针座本体 （1) 下端开设有回拉锁定腔 （2)， 其特征在于： 所述内针座本体（1)处设有针管基座（3)， 和与针管基座（3)成一 体结构的弹性密封限位基座 （4) 构成， 两者成一体式单体结构， 针 管基座 （3) 与弹性密封限位基座 （4) 之间形成环状台阶 （7) 或环 状坡面， 弹性密封限位基座 （4) 表面开设有环状缓冲间隙 （5)， 环 状缓冲间隙（5)外侧的弹性密封限位基座（4)外壁处形成环状密封 限位卡合部 （6)。
2.—种用于安全自毁式注射器的内针座结构， 它包括内针座本体 (1)， 内针座本体 （1) 下端开设有回拉锁定腔 （2)， 其特征在于： 所述内针座本体（1)处设有针管基座（3)， 和与针管基座（3)成分 体结构的弹性密封限位基座 （4) 构成， 两者成分体式装配结构， 针 管基座 （3) 与弹性密封限位基座 （4) 之间形成环状台阶 （7) 或环 状坡面， 弹性密封限位基座 （4) 表面开设有环状缓冲间隙 （5)， 环 状缓冲间隙（5)外侧的弹性密封限位基座（4)外壁处形成环状密封 限位卡合部 （6)。
3.根据权利要求 1所述的一种用于安全自毁式注射器的内针座结 构， 其特征在于： 所述环状缓冲间隙 （5) 槽口至槽底的高度为 0.1mm-20mm, 环状缓冲间隙（5)的宽度为 0.1mm-20mm， 环状缓冲 间隙（5)外侧槽壁与环状密封限位卡合部（6)表面弧面弧顶的距离 为 0.1mm-20mm， 环状缓冲间隙 （5) 外侧槽壁槽口处与环状密封限 位卡合部 （6) 外壁之间的距离为 0.1mm-20mm， 环状缓冲间隙 （5 ) 外侧槽壁槽底处与环状密封限位卡合部 （6 ) 外壁之间的距离为 0.1mm-20mm。
4.根据权利要求 1 所述的一种用于安全自毁式注射器的内针座 结构， 其特征在于： 环状密封限位卡合部 （6) 的表面成弧面状。
5.根据权利要求 1 所述的一种用于安全自毁式注射器的内针座 结构， 其特征在于： 所述密封限位凸筋 （6) 表面成弧面状， 其弧顶 至弧面上边缘的距离小于弧顶至弧面下边缘的距离。
6.根据权利要求 1 所述的一种用于安全自毁式注射器的内针座 结构， 其特征在于： 所述密封限位凸筋 （6) 下部的弹性密封限位基 座 （4) 外壁处形成环状凹陷 （8)。
7.根据权利要求 6 所述的一种用于安全自毁式注射器的内针座 结构， 其特征在于： 所述环状凹陷（8)与环状缓冲间隙（5 ) 的槽底 位于同一水平面或高于环状缓冲间隙 （5 ) 的槽底。
8.根据权利要求 1 所述的一种用于安全自毁式注射器的内针座 结构， 其特征在于： 所述环状台阶 （7) 处套接有 "0"形密封橡圈
( 10)。
9.根据权利要求 1 所述的一种用于安全自毁式注射器的内针座 结构， 其特征在于： 所述弹性密封限位基座 （4 ) 上表面开设有环状 缓冲间隙 (5)。
10.根据权利要求 1所述的一种用于安全自毁式注射器的内针座 结构， 其特征在于： 所述弹性密封限位基座 （4 ) 下表面开设有环状 缓冲间隙 （5)。
11.根据权利要求 1所述的一种用于安全自毁式注射器的内针座 结构， 其特征在于： 所述针管基座 （3 ) 成柱体状， 弹性密封限位基 座（4)设置于针管基座（3 )底部处， 两者形成一体式单体结构或分 体式装配结构。
12.根据权利要求 1所述的一种用于安全自毁式注射器的内针座 结构， 其特征在于： 所述针管基座 （3 ) 成柱体状， 弹性密封限位基 座（4)设置于针管基座（3 )柱体中段处， 两者形成一体式单体结构 或分体式装配结构.
13.根据权利要求 1所述的一种用于安全自毁式注射器的内针座 结构， 其特征在于： 所述针管基座 （3 ) 成柱体状， 弹性密封限位基 座（4)设置于针管基座（3 )顶部处， 两者形成一体式单体结构或分 体式装配结构。
14.根据权利要求 1所述的一种用于安全自毁式注射器的内针座 结构， 其特征在于： 所述弹性密封限位基座 （4) 外壁的环状密封限 位卡合部 （6) 处形成若干缺口或切断线。
PCT/CN2012/000760 2011-06-07 2012-06-04 一种用于安全自毁式注射器的内针座结构 Ceased WO2012167605A1 (zh)

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