WO2013010376A1 - 一种用于安全自毁式注射器的可换针内针座 - Google Patents

一种用于安全自毁式注射器的可换针内针座 Download PDF

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Publication number
WO2013010376A1
WO2013010376A1 PCT/CN2012/000929 CN2012000929W WO2013010376A1 WO 2013010376 A1 WO2013010376 A1 WO 2013010376A1 CN 2012000929 W CN2012000929 W CN 2012000929W WO 2013010376 A1 WO2013010376 A1 WO 2013010376A1
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WO
WIPO (PCT)
Prior art keywords
needle
needle seat
annular
inner needle
wall
Prior art date
Application number
PCT/CN2012/000929
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English (en)
French (fr)
Inventor
王祖扬
Original Assignee
倍安德普医疗科技（上海）有限公司
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Publication of WO2013010376A1 publication Critical patent/WO2013010376A1/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
    • A61M5/3129—Syringe barrels
    • A61M5/3134—Syringe barrels characterised by constructional features of the distal end, i.e. end closest to the tip of the needle cannula
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—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
    • A61M5/34—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
    • 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
    • A61M5/347—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub rotatable, e.g. bayonet or screw
    • 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
    • A61M5/504—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe for blocking the fluid passageway

Definitions

  • the present invention relates to the technical field of medical devices, and more particularly to a replaceable needle inner needle seat structure for a safe self-destructing syringe, and more particularly to a mechanical connection structure thereof.
  • the syringe includes a syringe, a push rod, a rubber plug, and a needle seat.
  • the front end of the push rod is connected with a frustum through a card core, and the needle seat and the front end of the syringe are detachably connected, and the needle seat is provided with a needle seat for mounting the needle.
  • a sealing water type 0 elastic sealing ring is arranged between the needle seat and the needle seat, wherein the needle cylinder is provided with a coupling needle seat matched with the needle seat, and the coupling needle seat is supported and fixed at the front end of the needle cylinder by the support base, and the needle seat A fixing ring is formed downwardly, and a snap ring is formed on the upper end of the coupling needle seat, the snap ring extends into the inner hole of the fixing ring and is engaged with the fixing ring, and a large groove is arranged on the hole wall of the inner hole of the coupling needle seat, and the support
  • the upper end of the seat extends into the inner hole of the coupling needle seat, and the upper end of the support seat is formed with a first elastic pawl gathered toward the center, and a support boss is arranged on the outer side of the upper end of the support seat, the boss falls in the large groove, and can be along the large groove Slide up and down, coupling needle Forming a first lower elastic claws, respectively provided with an inner
  • the existing single-needle retractable safety self-destructing syringe or safety syringe has the same problem in design and use, that is, between the pulling force required for retraction and the inner needle seat clamping force.
  • a syringe with a double needle seat structure has emerged, but such a double needle seat syringe still has many problems that cannot be overcome, for example, the double needle seat syringe has poor sealing performance, and the double seat syringe The work stability is not good, and the cost of the mold for the double needle seat syringe is high.
  • the object of the present invention is to provide a replaceable needle inner needle seat structure for a safe self-destructing syringe, which adopts a single inner needle seat structure, and the outer wall of the inner needle seat forms a buffer portion, which can provide stable and reasonable clamping force.
  • the effect is to obtain the best balance point of the back pumping force and the clamping force, and the screw type needle changing function overcomes the shortcomings and deficiencies in the prior art.
  • the technical solution of the present invention is: a replaceable needle inner needle seat structure for a safe self-destructing syringe, comprising an inner needle seat body, the lower end of the inner needle seat body is provided with a pull-back locking cavity,
  • the utility model is characterized in that: the inner needle seat body is composed of an upper needle-receiving part and a lower elastic sealing limit part, and the two are formed into a single unitary structure, and the surface of the elastic sealing limit part is provided with an annular buffer gap, and the elasticity is An annular seal limit engagement portion is formed at an outer wall of the seal limiting portion.
  • the utility model relates to a replaceable needle inner needle seat structure for a safety self-destructing syringe, which comprises an inner needle seat body, and a lower pull-locking cavity is opened at a lower end of the inner needle seat body, wherein: the inner needle seat body is composed of an upper part
  • the needle-changing assembly portion and the lower elastic sealing limit portion are formed, and the two components are assembled in an assembled manner, and the surface of the elastic sealing limit portion is provided with an annular buffer gap, and the elastic sealing is provided.
  • An annular seal limit engagement portion is formed at the outer wall of the limiting portion.
  • the invention discloses a replaceable needle inner needle seat structure for a safety self-destructing syringe, wherein the end portion has a screw-type needle-changeable structure, and the replacement needle and the inner needle seat are screwed together, the single body
  • the inner needle seat structure has a good elastic buffering effect, which overcomes the defects caused by the material's own characteristics.
  • the elastic buffer can ensure the bite force and sealing between the inner needle seat and the neck, and is pumped back in the inner needle seat.
  • the inner needle seat can be injection molded at one time, which effectively reduces the manufacturing cost and simplifies the manufacturing process. In practical use, it is easy to operate, stable in working condition, and has good practicability. It has outstanding substantive features and significant progress compared to the prior art.
  • FIG. 1 is a schematic structural view of a first embodiment of the present invention.
  • FIG. 2 is a schematic view showing the internal structure of a second embodiment of the present invention.
  • FIG. 3 is a schematic view showing the external structure of a second embodiment of the present invention.
  • Figure 4 is a plan view of Figure 3.
  • Figure 5 is a schematic view showing the structure of the cylinder of the present invention.
  • Figure 6 is a diagram showing the state of use of the second embodiment of the present invention.
  • the invention relates to a replaceable needle inner needle seat structure for a safe self-destructing syringe, which comprises an inner needle seat body 1 , and a lower pull-locking cavity 2 is opened at a lower end of the inner needle seat body 1 , which is different from the prior art in that
  • the inner needle hub body 1 is composed of an upper needle-receiving portion 3 and a lower portion
  • the elastic sealing limit portion 4 is formed, and the two are integrated into a single structure.
  • the surface of the elastic sealing limiting portion 4 is provided with an annular buffer gap 5, and the outer wall of the elastic sealing limiting portion 4 forms an annular sealing limit engaging portion. 6.
  • the utility model relates to a replaceable needle inner needle seat structure for a safety self-destructing syringe, which comprises an inner needle seat body 1.
  • the lower end of the inner needle seat body 1 is provided with a pull-back locking cavity 2, which is characterized in that: the inner needle seat body 1 is composed of an upper needle-receiving portion 3 and a lower elastic sealing portion 4, and the two parts are assembled in a body.
  • the surface of the elastic sealing portion 4 is provided with an annular buffer gap 5, and the outer wall of the elastic sealing portion 4 is elastically sealed.
  • An annular seal limit engagement portion 6 is formed at the position.
  • the upper portion of the interchangeable needle fitting portion 3 has a truncated cone shape with a taper of 6:100, and the outer wall of the replaceable needle fitting portion 3 is provided with an outer spiral pattern 8, and the outer wall of the lower portion of the replaceable needle fitting portion 3 is provided.
  • the anti-scrolling ribs 9 are distributed in a ring shape.
  • the replaceable needle fitting portion 3 has a columnar body, the columnar body cavity is hollow, the inner spiral wall of the hollow inner cavity forms an inner spiral 10, and the lower cavity of the hollow inner cavity has an inverted truncated cone shape with a taper of 6 : 100.
  • the outer wall of the interchangeable needle fitting portion 3 is annularly distributed with an anti-side rib 9 .
  • the end portion of the anti-side rib 9 is semi-arc or tapered, and can cooperate with the inner wall limiting structure of the end of the syringe barrel 14 to effectively prevent the inner needle seat from rotating sideways.
  • annular step 11 or an annular slope is formed between the interchangeable needle fitting portion 3 and the elastic sealing limiting portion 4, and an "O"-shaped sealing rubber ring is sleeved at the annular step 11.
  • the 0"-shaped sealing rubber ring is located between the neck and the inner needle seat and provides a good sealing effect.
  • the height of the annular buffer gap 5 from the slot to the bottom of the slot is 0.1mm-20mm
  • the width of the annular buffer gap 5 is 0.1mm-20mm
  • the distance between the outer groove wall of the annular buffer gap 5 and the arc-shaped top of the annular seal limit engagement portion 6 is 0.1mm-20mm
  • ring The distance between the outer groove wall slot of the cushioning gap 5 and the outer wall of the annular seal limiting engagement portion 6 is 0.1 mm-20 mm
  • the outer side of the annular buffer gap 5 is engaged with the annular seal limit.
  • the distance between the outer walls of the portion 6 is 0.1 mm to 20 mm.
  • the surface of the annular seal limiting engagement portion 6 has a curved surface shape and has a good guiding effect.
  • 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 12 is formed at the outer wall of the elastic sealing limit portion 4 of the lower portion of the annular seal limiting engagement portion 6.
  • annular recess 12 and the bottom of the annular buffer gap 5 are located at the same level or higher than the bottom of the annular buffer gap 5.
  • annular buffer gap 5 is formed on the upper surface or the lower surface of the elastic sealing stopper portion 4.
  • the elastic sealing stop portion 4 is disposed at or at the bottom portion or at the top of the needle-removable portion 3, and the two form a unitary unitary structure or a split-type assembly structure.
  • a plurality of notches or cut lines are formed at the annular seal limit engagement portion 6 of the outer wall of the elastic seal limiting portion 4.
  • the inner hub body 1 is assembled from the rear of the cylinder body 14 into the cylinder neck 15, and the annular seal limiting engagement portion 6 at the inner needle hub body is just caught at the inner wall of the cylinder neck inner cavity.
  • the annular limit sealing recess 17 is in the annular position, and the anti-side rib 9 at the outer wall of the inner needle seat body 1 can be locked and interlocked with the anti-side rotation auxiliary rib 18 at the inner wall of the cylinder neck, thereby effectively preventing the inner needle seat from being used.
  • the replaceable needle 16 can be screwed into the inner needle seat body 1 from the front end, and the two sides are screwed and matched for convenient replacement.

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

Abstract

一种用于安全自毁式注射器的可换针内针座，其包括内针座本体（1）。所述内针座本体（1）由上部的可换针装配部（3）和下部的弹性密封限位部（4）构成，两者成一体式单体结构或成分体式装配结构，弹性密封限位部（4）表面开设有环状缓冲间隙（5），弹性密封限位部（4）的外壁处形成环状密封限位卡合部（6），可换针装配部（3）具备外螺旋紋（8）或内螺旋紋（10），替换针头（16）与内针座之间采用旋接方式配合。该内针座具有很好的弹性缓冲效果，在确保与筒颈之间的咬合力和密封性的同时，能减少内针座回拉时所需的拉力。

Description

说 明 书
一种用于安全自毁式注射器的可换针内针座
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 式注射器的可换针内针座结构， 特别涉及其机械连接结构。
背景技术
对比文件， 专利号： 201010204868. 5, 申请日： 2010. 06. 21 , 公告号： CN101862490A,专利权人：温岭市千禧光医疗器械有限公司， 本案公开了 "一种可换针自毁式胰岛素注射器"， 包括针筒、 推杆、 胶塞、针座， 推杆前端通过卡芯连接有锥台， 针座与针筒前端为可拆 式连接， 针座内设有安装针头的针头座， 针头座与针座之间设有封水 0型弹性密封圈，其特征在于：针筒设有与针头座相配合的联接针座， 联接针座由支撑座支撑固定在针筒前端，针头座向下延伸成型有固定 环， 联接针座上端成型有卡环， 卡环伸入固定环内孔并与固定环相卡 合固定， 联接针座内孔的孔壁上设有大凹槽， 支撑座上端伸入联接针 座内孔， 支撑座上端成型有向中心聚拢的第一弹性棘爪，支撑座上端 外侧设有一圈凸台， 凸台落在大凹槽内， 并可沿大凹槽上下滑动， 联 接针座下端成型有第一弹性撑爪，相应地针筒内壁设有第一弹性撑爪 可嵌入的小凹槽， 支撑座下端外侧设有一圈凸台肩， 凸台肩与第一弹 性撑爪相抵。
现有的单针座回抽式安全自毁式注射器或安全注射器在设计和 使用中均存在同一个难题，就是回抽时所需拉力和内针座卡合力之间 的平衡点问题， 为了克服上述平衡力问题， 出现了双针座结构的注射 器， 但此类双针座注射器仍然存在诸多问题无法克服， 例如， 双针座 注射器的密封性不佳， 双座注射器的工作稳定性不佳， 双针座注射器 的模具成本较高。
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内针座卡合力和回 拉力， 且具备可换针功能的单体内针座结构。 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可换针内 针座结构， 其采用单体式内针座结构， 内针座外壁形成缓冲部， 能提 供稳定而合理的卡合力效果， 获取最佳的回抽力和卡合力的平衡点， 并具备螺旋式可换针功能， 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 注射器的可换针内针座结构， 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：所述内针座本体由上部的可换针装配 部和下部的弹性密封限位部构成，两者成一体式单体结构， 弹性密封 限位部表面开设有环状缓冲间隙，弹性密封限位部的外壁处形成环状 密封限位卡合部。
一种用于安全自毁式注射器的可换针内针座结构，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 本体由上部的可换针装配部和下部的弹性密封限位部构成，两者成分 体式装配结构， 弹性密封限位部表面开设有环状缓冲间隙， 弹性密封 限位部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可换针内针座 结构， 其端部具备螺旋式可换针结构， 替换针头与内针座之间采 用旋接方式配合， 该单体式内针座结构具有很好的弹性缓冲效 果，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， 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内部结构示意图。
图 3为本发明第二实施例外部结构示意图。
图 4为图 3的俯视图。
图 5为本发明筒体结构示意图。
图 6为本发明第二实施例使用状态图。
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可换针内针座结构，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， 其区别于 现有技术在于：所述内针座本体 1由上部的可换针装配部 3和下部的 弹性密封限位部 4构成， 两者成一体式单体结构， 弹性密封限位部 4 表面开设有环状缓冲间隙 5， 弹性密封限位部 4的外壁处形成环状密 封限位卡合部 6。
一种用于安全自毁式注射器的可换针内针座结构，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由上部的可换针装配部 3和下部的弹性密封限位部 4构 成， 两者成分体式装配结构， 弹性密封限位部 4表面开设有环状缓冲 间隙 5， 弹性密封限位部 4外壁处形成环状密封限位卡合部 6。
在具体实施时， 所述可换针装配部 3上部呈圆锥台状，其锥度为 6： 100, 可换针装配部 3外壁设有外螺旋纹 8， 可换针装配部 3下部 的外壁处呈环状分布有防侧旋凸筋 9。
在具体实施时，所述可换针装配部 3呈柱状体，柱状体内腔中空， 中空内腔的内壁上部形成内螺旋纹 10， 中空内腔下部腔体呈倒圆锥 台状， 其锥度为 6: 100, 可换针装配部 3的外壁处呈环状分布有防 侧旋凸筋 9。
在具体实施时，所述防侧旋凸筋 9的端部呈半圆弧状或锥状， 可 与注射器筒体 14端部筒颈内壁限位结构相配合， 有效防止内针座侧 旋。
在具体实施时，所述可换针装配部 3与弹性密封限位部 4之间形 成环状台阶 11或环状坡面， 环状台阶 11处套接有 "O"形密封橡圈， "0"形密封橡圈位于筒颈和内针座之间， 能起到很好的密封效果。
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， 具有很 好的导向效果。
在具体实施时， 所述环状密封限位卡合部 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。
在具体实施时，所述环状密封限位卡合部 6下部的弹性密封限位 部 4外壁处形成环状凹陷 12。
在具体实施时， 所述环状凹陷 12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。
在具体实施时，所述弹性密封限位部 4上表面或下表面开设有环 状缓冲间隙 5。
在具体实施时，所述弹性密封限位部 4设置于可换针装配部 3底 部处或中段处或顶部处， 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，所述弹性密封限位部 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 6中所示， 内针座本体 1从筒体 14后部组装到筒颈 15内， 内针座本体处的环状密封限位卡合部 6 刚好卡在筒颈内腔内壁处的 环状限位密封凹陷部 17内， 而内针座本体 1外壁处的防侧旋凸筋 9 可与筒颈内壁处的防侧旋辅助凸筋 18交叉配合锁定， 有效防止内针 座在使用时发生侧旋，可换针头 16从前端旋入内针座本体 1内即可， 两侧采用螺纹旋接方式配合， 方便替换。
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可换针内针座结构， 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 ) 由上部的可换针装配部（3 )和下部的弹 性密封限位部 （4) 构成， 两者成一体式单体结构， 弹性密封限位部 (4)表面开设有环状缓冲间隙（5)， 弹性密封限位部（4) 的外壁处 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可换针内针座结构， 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 ) 由上部的可换针装配部（3 )和下部的弹 性密封限位部 （4) 构成， 两者成分体式装配结构， 弹性密封限位部
(4)表面开设有环状缓冲间隙（5 )， 弹性密封限位部（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可换针 内针座结构， 其特征在于： 所述可换针装配部（3)上部呈圆锥台状， 其锥度为 6: 100, 可换针装配部 （3)外壁设有外螺旋纹（8)， 可换 针装配部 （3) 下部的外壁处呈环状分布有防侧旋凸筋 （9)。
4.根据权利要求 1 所述的一种用于安全自毁式注射器的可换针 内针座结构， 其特征在于： 所述可换针装配部 （3) 呈柱状体， 柱状 体内腔中空， 中空内腔的内壁上部形成内螺旋纹 （10)， 中空内腔下 部腔体呈倒圆锥台状， 其锥度为 6: 100, 可换针装配部 （3) 的外壁 处呈环状分布有防侧旋凸筋 （9)。
5.根据权利要求 3或 4所述的一种用于安全自毁式注射器的可换 针内针座结构， 其特征在于： 所述防侧旋凸筋 （9) 的端部呈半圆弧 状或锥状。
6.根据权利要求 1 所述的一种用于安全自毁式注射器的可换针 内针座结构， 其特征在于： 所述可换针装配部 （3 ) 与弹性密封限位 部 （4) 之间形成环状台阶 （11 ) 或环状坡面。
7.根据权利要求 1所述的一种用于安全自毁式注射器的可换针内 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
Figure imgf000010_0001
8.根据权利要求 1 所述的一种用于安全自毁式注射器的可换针 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。
9.根据权利要求 1 所述的一种用于安全自毁式注射器的可换针 内针座结构， 其特征在于： 所述环状密封限位卡合部 （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。
10.根据权利要求 1所述的一种用于安全自毁式注射器的可换针 内针座结构， 其特征在于： 所述环状密封限位卡合部 （6) 下部的弹 性密封限位部 （4) 外壁处形成环状凹陷 （12)。
11.根据权利要求 10 所述的一种用于安全自毁式注射器的可换 针内针座结构，其特征在于：所述环状凹陷（12)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。
12.根据权利要求 6所述的一种用于安全自毁式注射器的可换针 内针座结构， 其特征在于： 所述环状台阶 （11 ) 处套接有 "O"形密 封橡圈。
13.根据权利要求 1所述的一种用于安全自毁式注射器的可换针 内针座结构， 其特征在于： 所述弹性密封限位部 （4) 上表面或下表 面开设有环状缓冲间隙 （5 )。
14.根据权利要求 1所述的一种用于安全自毁式注射器的可换针 内针座结构， 其特征在于： 所述弹性密封限位部 （4) 设置于可换针 装配部 （3 ) 底部处或中段处或顶部处， 两者形成一体式单体结构或 分体式装配结构。
15.根据权利要求 1所述的一种用于安全自毁式注射器的可换针 内针座结构， 其特征在于： 所述弹性密封限位部 （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。
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