WO2013127260A1 - Replaceable-needle inner needle base structure for use in safe self-destructing syringe - Google Patents

Replaceable-needle inner needle base structure for use in safe self-destructing syringe Download PDF

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Publication number
WO2013127260A1
WO2013127260A1 PCT/CN2013/000191 CN2013000191W WO2013127260A1 WO 2013127260 A1 WO2013127260 A1 WO 2013127260A1 CN 2013000191 W CN2013000191 W CN 2013000191W WO 2013127260 A1 WO2013127260 A1 WO 2013127260A1
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WO
WIPO (PCT)
Prior art keywords
needle
annular
wall
replaceable
groove
Prior art date
Application number
PCT/CN2013/000191
Other languages
French (fr)
Chinese (zh)
Inventor
王祖扬
Original Assignee
Wang Zuyang
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 Wang Zuyang filed Critical Wang Zuyang
Publication of WO2013127260A1 publication Critical patent/WO2013127260A1/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
    • A61M5/178—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    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston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
    • A61M5/3221—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
    • A61M5/344—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub using additional parts, e.g. clamping rings or collets
    • A61M5/345—Adaptors positioned between needle hub 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
    • A61M5/347—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub rotatable, e.g. bayonet or screw

Definitions

  • the present invention relates to the technical field of medical devices, and more particularly to a needle-changeable needle hub structure for a safe self-destructing syringe, and more particularly to a mechanical connection structure thereof.
  • the core rod body has a certain elasticity, wherein the longitudinal notch is narrow and wide, and the outer wall of the upper core rod of the lateral notch protrudes from the outer wall of the lower core rod, the lateral gap
  • the outer end of the core rod is in the shape of a circular arc
  • the upper needle seat is formed into a cylindrical shape
  • the upper part of the outer wall of the upper needle seat is provided with a reinforcing wing piece
  • the lower part of the outer wall of the upper needle seat is provided with a fixed convex ring of the upper needle seat
  • the outer diameter of the fixing ring of the needle seat is larger than the diameter of the outer wall of the upper needle seat of 0 05mm-0.3mm
  • the lower needle seat is cylindrical
  • the inner cavity is hollow
  • the inner wall of the lower needle cavity is provided with a lower needle seat annular fixing concave
  • the annular fixing groove of the lower needle seat can cooperate with the fixing convex ring of the upper needle seat, and the inner diameter of the upper cavity
  • the inner wall of the cylinder neck of the cylinder body is respectively provided with a cylinder neck upper limit ring and a cylinder neck lower limit ring, and the distance between the cylinder neck upper limit ring and the cylinder neck lower limit ring is 0.3 mm - 1.5 mm, and the cylinder neck upper limit position
  • the ring protrudes from the inner wall of the upper end ring of the cylinder neck and the lower limit ring of the cylinder neck by 0.1 mm - 0.6 mm.
  • the lower limit ring of the neck protrudes from the inner wall of the upper end ring of the cylinder neck and the lower limit ring of the cylinder neck to 0.02 mm - 0.25 mm
  • the inner diameter of the upper cylinder of the upper cylinder of the upper end of the cylinder neck is the upper limit ring of the inner cylinder and the lower limit of the neck of the cylinder
  • the inner diameter of the inner cavity of the cylinder is smaller than the outer diameter of the annular rib of the lower needle seat by 0.1 mm - 0.5 mm, and the inner cavity of the cylinder is opposite to the cylinder
  • the inner wall of the other end of the neck is provided with a cylinder
  • the function of retracting the needle by using the barb body is realized, and safety injection is realized.
  • the barb body is a metal piece or a plastic piece.
  • Metal parts need to be processed and matched or assembled with the core rod.
  • the manufacturing process is complicated, difficult and not stable, which not only increases the processing steps and manufacturing costs, but also increases the safety and product quality of the metal parts themselves and their assembly process. Uncertainty in terms of hidden dangers.
  • Existing plastic barbs still have defects or imperfections in structure, which leads to safety hazards or safety holes in the use of the product.
  • the existing plastic inverted fastener design can realize the needle pullback function, but in use, the needle is still in a normal trajectory after being pulled back, and the needle may be pushed out again, causing the user to be damaged twice.
  • the existing single needle seat back-pull safety self-destructing syringe or safety syringe has the same problem, that is, how to solve the stability of the inner needle seat and the cylinder and achieve a certain strength to meet the stability.
  • sexual requirements At the same time, the required pulling force when retracting the needle holder should not be too large for convenient use.
  • the rigid mating structure can achieve a stable locking effect on the inner needle seat and the inner wall of the cylinder, it is difficult or even impossible to achieve the convenience of use at the same time.
  • the inherent instability of the plastic material and its susceptibility to changes in ambient temperature can result in poor stability of the product of the hard-fit structure, and the quality and precision of the production process are difficult to control, making it almost impossible to achieve mass production.
  • the syringe needle can be locked between the needle seat and the syringe barrel by an elastic buffer mechanism, and the expansion force is generated by the deformation of the buffer gap to achieve the locking and disengaging effect of the two.
  • the elastic buffer mechanism can be disposed at the inner needle seat. It can also be disposed at the inner wall of the cylinder.
  • the inner needle seat and the cylinder body form an elastic buffering engagement mechanism which can cooperate with each other, and the end of the core rod is provided with an asymmetric locking member with an elastic function, and the locking member can be Interlocking with the inner cavity of the syringe needle by locking, and when the needle holder is pulled back into the syringe barrel After the force of the asymmetric elastic structure, the needle seat will be deflected to one side by force, and the needle will be inverted toward the inner wall of the cylinder in the direction of nearly forty-five degrees, and locked by the neck of the cylinder.
  • a first technical solution of the present invention is: a replaceable needle inner needle seat structure for a safe self-destructing syringe, comprising a needle base body, wherein: the needle seat body The inner cavity is hollow, and the hollow inner cavity is provided with an inner sleeve type pull-back locking assembly, and the upper part of the needle seat body forms a replaceable needle fitting portion, and the lower part of the needle seat body forms an elastic sealing limit portion, and the needle-changeable assembly portion
  • the elastic sealing limit portion is formed into a single unit structure, and the surface of the elastic sealing limit portion is provided with an annular buffer gap, and the outer wall of the elastic sealing limit portion outside the annular buffer gap forms an annular sealing limit engaging portion, and the elastic sealing Anti-bending ribs are arranged on the outer wall of the limiting portion.
  • a second technical solution of the present invention is: a replaceable needle inner needle seat structure for a safe self-destructing syringe, comprising a needle base body, wherein: the needle seat body The inner cavity is hollow, and the hollow inner cavity is provided with an inner sleeve type pull-back locking assembly.
  • the upper part of the needle seat body forms a replaceable needle fitting portion
  • the lower part of the needle seat body forms an elastic sealing limit portion
  • the elastic sealing limit component body assembly structure the surface of the elastic sealing limit portion is provided with an annular buffer gap, and the outer wall of the elastic sealing limit portion outside the annular buffer gap forms an annular sealing limit engagement portion, and the elastic sealing limit Anti-side ribs are provided on the outer wall of the part.
  • the present invention discloses a replaceable needle inner needle seat structure for a safe self-destructing syringe, and an end of the syringe core rod matched therewith is provided with an asymmetric pull-back locking member with elastic function; an asymmetric structure
  • the elastic function design ensures that the locking member can be smoothly inserted into the inner cavity of the needle seat, and the elastic expansion force acts to realize the engagement card of the inner sleeve type pull-back locking component of the asymmetric engaging portion and the inner cavity of the needle seat.
  • the inner sleeve pull-back locks the inner cavity of the assembly, and locks with the inner sleeve type pull-back locking assembly when the locking member is retracted, and when the needle holder is pulled back into the syringe barrel, under the force of asymmetric force
  • the needle seat will deflect toward one side, and the needle will therefore fall to the side of the inner wall of the cylinder in the direction of nearly forty-five degrees, and will be locked by the neck of the cylinder, thereby causing the needle and the needle holder to be unable to be pushed out again.
  • neck The department effectively prevents the needle from being pushed out again to cause secondary damage, and truly realizes the safe self-destruct operation of the syringe.
  • the pullback locking member is a plastic barb body.
  • the plastic barb body adopts a design principle that the asymmetry and the elastic structure are skillfully matched, and the specific angle and size design are adopted, so that the barb body has an elastic buffer locking function, and the above asymmetric elastic pull-back locking member and the core rod Integral structure, the whole part is molded in one time, no need for separate processing or subsequent assembly, which effectively reduces the manufacturing cost, simplifies the assembly process and reduces the assembly process.
  • the product is easy to operate and has stable working condition.
  • the asymmetric elastic pull-back piece at the end of the core rod and the inner cavity of the needle seat have excellent locking and locking effect.
  • the overall structure of the product is reasonable, the concept is clever, and it is easy to promote and apply. Compared with the existing products. In terms of design and technology, the design has significant technical breakthroughs and outstanding safety and practical features.
  • Fig. 1 is a schematic structural view of the present invention.
  • FIG. 2 is a schematic structural view of a body of a hub of the present invention.
  • FIG. 3 is a schematic structural view of an inner sleeve type pull-back locking assembly according to the present invention.
  • FIG. 4 is a view showing a state of use of the present invention.
  • the present invention is a replaceable needle inner needle seat structure for a safety self-destructing syringe, which comprises a needle base body, which is different from the prior art in that: the needle seat body cavity is hollow, the hollow body An inner sleeve type pull-back locking assembly 7 is disposed in the inner cavity, and the upper part of the needle seat body forms a replaceable needle fitting portion 1.
  • the lower portion of the needle seat body forms an elastic sealing limit portion 2, the needle-changeable assembly portion 1 and the elastic seal
  • the limiting portion 2 is formed as a unitary single body structure, and the annular sealing gap 3 is formed on the surface of the elastic sealing limiting portion 2, and the outer wall of the elastic sealing limiting portion 2 on the outer side of the annular buffering gap 3 forms an annular sealing limit engaging portion 4
  • the side wall of the elastic sealing limit portion 2 is provided with an anti-side rotation rib 5 .
  • the elastic sealing limit portion enables the stable engagement between the needle holder body and the cylinder body, and achieves the effect of lightly withdrawing.
  • Another technical solution of the present invention is a replaceable needle inner needle seat structure for a safe self-destructing syringe, which comprises a needle base body, which is different from the prior art in that: the needle seat body cavity Hollow, the hollow inner cavity is provided with an inner sleeve type pull-back locking assembly 7, the upper part of the needle seat body forms a replaceable needle fitting portion 1, and the lower part of the needle seat body forms an elastic sealing limit portion 2, which can be assembled by needle
  • the portion 1 and the elastic sealing limit portion 2 are assembled in a body shape, and the annular sealing gap 3 is opened on the surface of the elastic sealing limiting portion 2, and the outer wall of the elastic sealing limiting portion 2 on the outer side of the annular buffering gap 3 forms an annular sealing limit card.
  • Joint 4 elastic sealing limit 2
  • An anti-side rib 5 is provided at the outer wall.
  • the outer spiral fitting portion 6 is formed at the interchangeable needle fitting portion 1.
  • the upper portion of the interchangeable needle fitting portion 1 has a truncated cone shape with a taper of 6:100, and the outer outer wall of the replaceable needle fitting portion 1 forms an outer spiral fitting portion 6.
  • the end portion of the anti-side rib 5 has a semi-circular shape or a tapered shape.
  • an excessive distance between the interchangeable needle fitting portion 1 and the elastic seal limiting portion 2 forms an annular step 8 or an annular slope.
  • the annular buffer gap 3 is an annular groove structure, the height from the notch to the bottom of the groove is 0.05mm-4mm, and the width of the annular buffer gap 3 is 0.05mm-4mm, ring buffer
  • the distance between the outer groove wall of the gap 3 and the arc top of the surface of the annular seal limit engagement portion 4 is 0.1 mm-6 mm, and the outer groove wall groove of the annular buffer gap 3 and the outer wall of the annular seal limit engagement portion 4
  • the distance between the gaps is 0.1mm-6mm, and the distance between the bottom of the outer groove wall of the annular buffer gap 3 and the outer wall of the annular seal limit engagement portion 4 is 0.1mm-6mm, and the annular seal limit engagement portion
  • the surface of the annular seal is 4, and the distance from the top of the annular seal to the edge of the arc is less than the distance from the top of the arc to the lower edge of the arc.
  • the lower end of the annular seal is engaged.
  • An annular recess 9 is formed at the outer
  • the annular recess 9 is located on the same horizontal surface as the groove bottom of the annular buffer gap 3 or higher than the groove bottom of the annular buffer gap 3.
  • annular sealing ring fitting groove 10 is formed at an outer wall of the elastic sealing limiting portion 2 of the lower portion of the annular step 8.
  • the annular sealing ring fitting groove 10 is sleeved with a "0" Shape sealing rubber ring 11.
  • At least one inner needle ring annular limiting groove 12 is formed at the inner wall of the needle body cavity, and the inner sleeve type pull-back locking component 7 is provided in the needle body body cavity, and the inner sleeve type pull-back At least one of the limiting collars 13 that cooperate with the inner needle ring annular limiting groove 12 is disposed at the outer wall of the locking assembly 7.
  • the inner sleeve type pull-back locking assembly 7 has a hollow inner cavity, and an inner wall of the inner cavity forms an annular engagement locking portion 14 near the lower end opening.
  • the upper portion of the annular locking locking portion 14 forms an annular groove 15
  • the inner side wall 16 of the annular groove 15 has a thickness of 0.01 mm - 3 mm
  • the inner side wall and the annular groove of the annular groove 15 15 The outer side wall 17 forms an angle of 2 to 90 degrees
  • the inner diameter formed at the upper end of the inner side wall of the annular groove 15 is 1 mm to 80 mm.
  • the annular groove 15 has a notch width greater than a groove bottom width.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (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

A replaceable-needle inner needle base structure for use in a safe self-destructing syringe. A needle base body has arranged therein an inner sleeve-type retracting-locking component (7). The upper part of the needle base body forms a replaceable-needle fitting part (1). The lower part of the needle base body forms a flexible sealing stopper part (2). The replaceable-needle fitting part (1) and the flexible sealing stopper part (2) are a single-body integrated structure. An annular cushioning gap (3) is provided on the surface of the flexible sealing stopper part (2). The outer wall of the flexible sealing stopper part (2) outside the annular cushioning gap (3) forms an annular sealing stopper engaging part (4). The annular sealing stopper engaging part (4) is capable of forming a flexible cushioned engagement with the inner wall of a barrel body. An annular engaging-locking part (14) matching a plunger retracting piece is arranged in a cavity of the inner sleeve-type retracting-locking component (7). The needle base body deflects to a side after being retracted into the barrel body, while an injection needle therefore swings in the direction of a nearly 45 degree angle towards a side of the inner wall of the barrel body and is locked by a neck part of the barrel body. This prevents the injection needle and the needle base from being pushed out of the neck part of the barrel body again, thus effectively preventing secondary injury caused by the needle being pushed out.

Description

一种用于安全自毁式注射器的可换针内针座结构 技术领域  Replaceable needle inner needle seat structure for safe self-destructing syringe
[0001] 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。  [0001] The present invention relates to the technical field of medical devices, and more particularly to a needle-changeable needle hub structure for a safe self-destructing syringe, and more particularly to a mechanical connection structure thereof.
背景技术 Background technique
[0002] 对比文件一， 专利号： ZL200710047077.4, 申请日： 2007.10.16， 公告号: CN10141 1908, 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， 芯 杆端部设有由横向缺口和纵向缺口联通而形成的弹性体，此处的芯杆杆体具有一 定的弹性，其中纵向缺口呈上窄下宽状，而横向缺口外部开口处上部芯杆杆体外 壁凸出于此处下部芯杆杆体外壁，横向缺口可为外高内低状，芯杆端部成圆弧状， 上针座成柱体状， 上针座外壁上段设有加强翼片， 上针座外壁下段设有上针座固 定凸环， 上针座固定凸环的外直径大于上针座外壁直径 0 05mm— 0.3mm， 所述 下针座成柱体状， 其内腔中空， 下针座腔体内壁处设有下针头座环形固定凹槽， 下针头座环形固定凹槽可与上针座固定凸环相配合，下针头座环形固定凹槽上部 腔体的内径小于上针座固定凸环上部杆体外壁外径 0.1mm— 0.35mm,下针头座 环形固定凹槽下部腔体的内径 上针座固定凸环下部杆体外壁外径，下针座相对 于下针头座凸环的另一端外壁端部处设有下针头座环形凸筋，所述筒体的筒颈内 壁处分别设有筒颈上限位环和筒颈下限位环，筒颈上限位环和筒颈下限位环之间 的距离为 0.3mm— 1.5mm, 筒颈上限位环凸出于筒颈上限位环和筒颈下限位环 之间内壁 0.1mm— 0.6mm，筒颈下限位环凸出于筒颈上限位环和筒颈下限位环之 间内壁 0.02mm— 0.25mm，筒颈上限位环上部筒体内腔的内径 筒颈上限位环和 筒颈下限位环之间筒体内腔的内径，筒颈上限位环和筒颈下限位环之间筒体内腔 的内径 筒颈下限位环下部筒体内腔的内径，筒颈上限位环和簡颈下限位环之间 筒体内腔的内径小于下针头座环形凸筋外径 0.1mm— 0.5mm，筒体内腔相对于筒 颈的另一端内壁处设有筒体限位筋，筒体限位筋可为线性环形筋、多条竖筋构成 的环形筋、 一条竖筋、 多个凸起点构成的环形筋， 筒体限位筋下部的筒体内壁处 设有筒体内凸筋， 筒体限位筋与筒体内凸筋之间的距离 环形限位片的厚度， 筒 体限位筋处的内径小于环形限位片的直径。 [0002] Comparative Document 1, Patent No.: ZL200710047077.4, Application Date: 2007.10.16, Announcement No.: CN10141 1908, Patentee: Shanghai Dingjiantang Biochemical Technology Co., Ltd., this case discloses "a safe self-destructive vaccine" The syringe comprises a cylinder, 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 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, the lower needle seat The inner cavity is hollow, the lower needle seat is formed into a cylindrical structure, and the lower needle seat is provided with a lower needle seat rib relative to the inner wall of the opening of the other end of the mounting needle seat, and the end of the core rod is formed by the lateral notch and the longitudinal notch communicating. Elastomer, where the core rod body has a certain elasticity, wherein the longitudinal notch is narrow and wide, and the outer wall of the upper core rod of the lateral notch protrudes from the outer wall of the lower core rod, the lateral gap The outer end of the core rod is in the shape of a circular arc, the upper needle seat is formed into a cylindrical shape, the upper part of the outer wall of the upper needle seat is provided with a reinforcing wing piece, and the lower part of the outer wall of the upper needle seat is provided with a fixed convex ring of the upper needle seat, The outer diameter of the fixing ring of the needle seat is larger than the diameter of the outer wall of the upper needle seat of 0 05mm-0.3mm, the lower needle seat is cylindrical, the inner cavity is hollow, and the inner wall of the lower needle cavity is provided with a lower needle seat annular fixing concave The annular fixing groove of the lower needle seat can cooperate with the fixing convex ring of the upper needle seat, and the inner diameter of the upper cavity of the annular fixing groove of the lower needle seat is smaller than the outer diameter of the outer wall of the upper rod of the upper fixing ring of the upper needle seat by 0.1 mm - 0.35 mm, The outer diameter of the lower cavity of the lower needle seat annular fixing groove is fixed on the outer diameter of the outer wall of the lower rod of the convex ring of the convex ring, and the lower needle seat is provided with the annular needle rib of the lower needle seat at the end of the outer wall of the other end of the lower needle seat convex ring. The inner wall of the cylinder neck of the cylinder body is respectively provided with a cylinder neck upper limit ring and a cylinder neck lower limit ring, and the distance between the cylinder neck upper limit ring and the cylinder neck lower limit ring is 0.3 mm - 1.5 mm, and the cylinder neck upper limit position The ring protrudes from the inner wall of the upper end ring of the cylinder neck and the lower limit ring of the cylinder neck by 0.1 mm - 0.6 mm. The lower limit ring of the neck protrudes from the inner wall of the upper end ring of the cylinder neck and the lower limit ring of the cylinder neck to 0.02 mm - 0.25 mm, and the inner diameter of the upper cylinder of the upper cylinder of the upper end of the cylinder neck is the upper limit ring of the inner cylinder and the lower limit of the neck of the cylinder The inner diameter of the inner cavity of the cylinder, the inner diameter of the inner cylinder of the cylinder neck and the lower limit ring of the cylinder neck, the inner diameter of the inner cylinder of the cylinder, the lower limit of the inner cylinder of the lower cylinder, the upper limit ring of the cylinder neck and the lower limit ring of the neck The inner diameter of the inner cavity of the cylinder is smaller than the outer diameter of the annular rib of the lower needle seat by 0.1 mm - 0.5 mm, and the inner cavity of the cylinder is opposite to the cylinder The inner wall of the other end of the neck is provided with a cylinder limiting rib, and the limiting rib of the cylinder body can be a linear annular rib, an annular rib composed of a plurality of vertical ribs, a vertical rib, and a plurality of convex ribs composed of a plurality of convex points, and the barrel body limit The inner wall of the cylinder at the lower part of the rib is provided with a convex rib in the cylinder, the distance between the limiting rib of the cylinder and the rib in the cylinder is the thickness of the annular limiting piece, and the inner diameter of the limiting rib of the cylinder is smaller than that of the annular limiting piece. diameter.
[0003】 现有安全注射器结构中有利用倒钩体实现针头回縮的功能， 实现安全注 射。一般倒钩体为金属件或塑料件。金属件需要加工并与芯杆配合或组装， 制作 工艺复杂， 难度大且稳定性不佳， 不但增加了加工工序和制造成本， 而且金属件 本身及其装配过程会增加产品在安全性及产品质量方面的隐患等不确定性。现有 塑料倒钩件在结构上仍存在缺陷或有不完善的地方，因此导致产品在使用过程中 存在安全隐患或安全漏洞。现有的塑料倒扣件设计， 虽能实现针头回拉功能， 但 在使用中，针头被回拉后仍然处于正常轨迹，针头有可能被再次推出造成使用者 被二次损伤的风险。  [0003] In the existing safety syringe structure, the function of retracting the needle by using the barb body is realized, and safety injection is realized. Generally, the barb body is a metal piece or a plastic piece. Metal parts need to be processed and matched or assembled with the core rod. The manufacturing process is complicated, difficult and not stable, which not only increases the processing steps and manufacturing costs, but also increases the safety and product quality of the metal parts themselves and their assembly process. Uncertainty in terms of hidden dangers. Existing plastic barbs still have defects or imperfections in structure, which leads to safety hazards or safety holes in the use of the product. The existing plastic inverted fastener design can realize the needle pullback function, but in use, the needle is still in a normal trajectory after being pulled back, and the needle may be pushed out again, causing the user to be damaged twice.
[0004] 另外， 现有的单针座回抽式安全自毁式注射器或安全注射器均存在同一 个难题，就是如何解决内针座与筒体之间卡合稳定并达到一定的强度以符合稳定 性要求； 同时， 在回抽针座时所需拉力不能太大以方便使用。硬性配合结构虽然 能达到内针座与筒体内壁稳定的锁定效果，但很难甚至是无法同时达到方便使用 的需求。塑料材料本身存在的不稳定性和易受环境温度变化的特性会导致硬配合 结构的产品稳定性极差，生产过程中质量和精度都难以控制， 几乎无法实现批量 生产。  [0004] In addition, the existing single needle seat back-pull safety self-destructing syringe or safety syringe has the same problem, that is, how to solve the stability of the inner needle seat and the cylinder and achieve a certain strength to meet the stability. Sexual requirements; At the same time, the required pulling force when retracting the needle holder should not be too large for convenient use. Although the rigid mating structure can achieve a stable locking effect on the inner needle seat and the inner wall of the cylinder, it is difficult or even impossible to achieve the convenience of use at the same time. The inherent instability of the plastic material and its susceptibility to changes in ambient temperature can result in poor stability of the product of the hard-fit structure, and the quality and precision of the production process are difficult to control, making it almost impossible to achieve mass production.
[0005] 综上所述， 仍然需要对现有回拉式注射器的芯杆结构和内针座与筒体之 间的锁定结构进行进一步改进，以进一步完善产品在使用过程中的安全性和稳定 性， 同时达到简化加工工序， 降低制造成本的目的。  [0005] In summary, there is still a need to further improve the core structure of the existing pullback syringe and the locking structure between the inner needle seat and the cylinder to further improve the safety and stability of the product during use. Sex, at the same time to achieve the purpose of simplifying the processing process and reducing manufacturing costs.
发明内容 Summary of the invention
[0006] 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。注射器可换针内针座与注射器筒体之间通过弹性缓冲机构相互锁定，利用缓 冲间隙的变形产生扩张力， 实现两者的锁定和脱离效果， 该弹性缓冲机构可设置 于内针座处， 亦可设置于筒体内壁处， 同时， 内针座和筒体处均形成可相互配合 的弹性缓冲卡合机构， 其芯杆端部设有带弹性功能的非对称锁定件， 该锁定件可 与注射器针座内腔通过卡合方式相互锁定， 并且， 当针座被回拉至注射器筒体内 后， 在非对称弹性结构的力量作用下， 针座会受力顺势向一侧偏转， 注射针因此 会以近四十五角方向倒向筒体内壁一侧， 并被筒体颈部锁定， 由此导致注射针及 针座无法被再次推出筒体颈部， 有效防止针头被再次推出造成的二次损伤， 实现 注射器的安全自毁操作， 克服了现有技术中存在的缺点和不足。 [0006] It is an object of the present invention to provide a replaceable needle inner needle seat structure for a safe self-destructing syringe. The syringe needle can be locked between the needle seat and the syringe barrel by an elastic buffer mechanism, and the expansion force is generated by the deformation of the buffer gap to achieve the locking and disengaging effect of the two. The elastic buffer mechanism can be disposed at the inner needle seat. It can also be disposed at the inner wall of the cylinder. At the same time, the inner needle seat and the cylinder body form an elastic buffering engagement mechanism which can cooperate with each other, and the end of the core rod is provided with an asymmetric locking member with an elastic function, and the locking member can be Interlocking with the inner cavity of the syringe needle by locking, and when the needle holder is pulled back into the syringe barrel After the force of the asymmetric elastic structure, the needle seat will be deflected to one side by force, and the needle will be inverted toward the inner wall of the cylinder in the direction of nearly forty-five degrees, and locked by the neck of the cylinder. This causes the injection needle and the needle seat to be unable to be pushed out again to the neck of the cylinder, effectively preventing the secondary damage caused by the needle being pushed out again, realizing the safe self-destruct operation of the syringe, and overcoming the shortcomings and deficiencies in the prior art.
[0007] 为了实现上述目的， 本发明的第一技术方案是： 一种用于安全自毁式注 射器的可换针内针座结构， 它包括针座本体， 其特征在于： 所述针座本体内腔中 空，该中空的内腔内设有内套式回拉锁定组件，所述针座本体上部形成可换针装 配部，针座本体的下部形成弹性密封限位部，可换针装配部和弹性密封限位部成 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，环状缓冲间隙外侧 的弹性密封限位部外壁形成环状密封限位卡合部，弹性密封限位部外壁处设有防 恻旋凸筋。  [0007] In order to achieve the above object, a first technical solution of the present invention is: a replaceable needle inner needle seat structure for a safe self-destructing syringe, comprising a needle base body, wherein: the needle seat body The inner cavity is hollow, and the hollow inner cavity is provided with an inner sleeve type pull-back locking assembly, and the upper part of the needle seat body forms a replaceable needle fitting portion, and the lower part of the needle seat body forms an elastic sealing limit portion, and the needle-changeable assembly portion The elastic sealing limit portion is formed into a single unit structure, and the surface of the elastic sealing limit portion is provided with an annular buffer gap, and the outer wall of the elastic sealing limit portion outside the annular buffer gap forms an annular sealing limit engaging portion, and the elastic sealing Anti-bending ribs are arranged on the outer wall of the limiting portion.
[0008〗 为了实现上述目的， 本发明的第二技术方案是： 一种用于安全自毁式注 射器的可换针内针座结构， 它包括针座本体， 其特征在于： 所述针座本体内腔中 空， 该中空的内腔内设有内套式回拉锁定组件，所述针座本体上部形成可换针装 配部， 针座本体的下部形成弹性密封限位部， 可换针装配部和弹性密封限位部成 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，环状缓冲间隙外侧 的弹性密封限位部外壁形成环状密封限位卡合部，弹性密封限位部外壁处设有防 侧旋凸筋。  [0008] In order to achieve the above object, a second technical solution of the present invention is: a replaceable needle inner needle seat structure for a safe self-destructing syringe, comprising a needle base body, wherein: the needle seat body The inner cavity is hollow, and the hollow inner cavity is provided with an inner sleeve type pull-back locking assembly. The upper part of the needle seat body forms a replaceable needle fitting portion, and the lower part of the needle seat body forms an elastic sealing limit portion, and the needle changing assembly portion And the elastic sealing limit component body assembly structure, the surface of the elastic sealing limit portion is provided with an annular buffer gap, and the outer wall of the elastic sealing limit portion outside the annular buffer gap forms an annular sealing limit engagement portion, and the elastic sealing limit Anti-side ribs are provided on the outer wall of the part.
[0009] 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， 与其配 合的注射器芯杆的端部设有带弹性功能的非对称回拉锁定件；非对称结构配合弹 性功能设计确保了该锁定件能顺利***针座内腔， 并利用弹性扩张力的作用，实 现两侧非对称卡合部与针座内腔的内套式回拉锁定组件卡合部卡合并锁定，由于 内套式回拉锁定组件卡内腔的环形凹槽也具有弹性缓冲特性，故与非对称回拉锁 定件在推进状态触及时，两者会相对产生缓冲变形，便于锁定件卡入内套式回拉 锁定组件内腔， 并在锁定件回抽时与内套式回拉锁定组件相互锁定， 当针座被回 拉至注射器筒体内后， 在非对称作用力的受力环境下， 针座会向一侧形成偏转， 注射针因此会以近四十五角方向倒向筒体内壁一侧， 并被筒体颈部锁定， 由此导 致注射针及针座无法被再次推出筒体颈部，有效防止针头被再次推出造成二次损 伤， 真正实现注射器的安全自毁操作。在本发明具体实施时， 所述的非对称弹性 回拉锁定件为一塑料倒钩体。该塑料倒钩体采用非对称性和弹性体结构巧妙配合 的设计原理，运用特定的角度和尺寸设计，使得倒钩本体具备弹性缓冲锁定功能， 另外， 上述非对称弹性回拉锁定件与芯杆成一体结构，整体部件采用一次开模成 型， 无需单独加工或后续装配， 有效降低了制造成本， 简化了装配工艺， 减少了 装配工序。产品使用操作简单， 工作状态稳定， 芯杆端部的非对称弹性回拉件与 针座内腔的卡合锁定效果极佳， 产品整体结构合理， 构思巧妙， 易于推广应用， 相比现有产品设计和技术而言， 设计上具有显著的技术性突破， 并具有突出的安 全性和实用性特点。 [0009] The present invention discloses a replaceable needle inner needle seat structure for a safe self-destructing syringe, and an end of the syringe core rod matched therewith is provided with an asymmetric pull-back locking member with elastic function; an asymmetric structure The elastic function design ensures that the locking member can be smoothly inserted into the inner cavity of the needle seat, and the elastic expansion force acts to realize the engagement card of the inner sleeve type pull-back locking component of the asymmetric engaging portion and the inner cavity of the needle seat. Combined locking, because the annular groove of the inner sleeve type pull-back locking component card cavity also has elastic buffering characteristics, and the asymmetric pull-back locking member touches in the advancing state, the two will relatively generate buffer deformation, which is convenient for the locking component card. The inner sleeve pull-back locks the inner cavity of the assembly, and locks with the inner sleeve type pull-back locking assembly when the locking member is retracted, and when the needle holder is pulled back into the syringe barrel, under the force of asymmetric force The needle seat will deflect toward one side, and the needle will therefore fall to the side of the inner wall of the cylinder in the direction of nearly forty-five degrees, and will be locked by the neck of the cylinder, thereby causing the needle and the needle holder to be unable to be pushed out again. neck The department effectively prevents the needle from being pushed out again to cause secondary damage, and truly realizes the safe self-destruct operation of the syringe. In the specific implementation of the present invention, the asymmetric elasticity The pullback locking member is a plastic barb body. The plastic barb body adopts a design principle that the asymmetry and the elastic structure are skillfully matched, and the specific angle and size design are adopted, so that the barb body has an elastic buffer locking function, and the above asymmetric elastic pull-back locking member and the core rod Integral structure, the whole part is molded in one time, no need for separate processing or subsequent assembly, which effectively reduces the manufacturing cost, simplifies the assembly process and reduces the assembly process. The product is easy to operate and has stable working condition. The asymmetric elastic pull-back piece at the end of the core rod and the inner cavity of the needle seat have excellent locking and locking effect. The overall structure of the product is reasonable, the concept is clever, and it is easy to promote and apply. Compared with the existing products. In terms of design and technology, the design has significant technical breakthroughs and outstanding safety and practical features.
附图说明 DRAWINGS
10010] 图 1为本发明结构示意图。  10010] Fig. 1 is a schematic structural view of the present invention.
[0011] 图 2为本发明针座本体结构示意图。  2 is a schematic structural view of a body of a hub of the present invention.
[0012] 图 3为本发明内套式回拉锁定组件结构示意图。  3 is a schematic structural view of an inner sleeve type pull-back locking assembly according to the present invention.
[0013] 图 4为本发明使用状态图。  4 is a view showing a state of use of the present invention.
具体实施方式 detailed description
[0014] 下面参照附图， 对本发明进一步进行描述。  [0014] The present invention will be further described below with reference to the accompanying drawings.
[0015] 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， 它包括针座 本体， 其区别于现有技术在于： 所述针座本体内腔中空， 该中空的内腔内设有内 套式回拉锁定组件 7， 所述针座本体上部形成可换针装配部 1， 针座本体的下部 形成弹性密封限位部 2,可换针装配部 1和弹性密封限位部 2成一体式单体结构， 弹性密封限位部 2表面开设有环状缓冲间隙 3， 环状缓冲间隙 3外侧的弹性密封 限位部 2外壁形成环状密封限位卡合部 4， 弹性密封限位部 2外壁处设有防侧旋 凸筋 5。 弹性密封限位部使得针座本体与筒体间既能达到稳定卡合的要求， 又能 实现轻便退出的效果。  [0015] The present invention is a replaceable needle inner needle seat structure for a safety self-destructing syringe, which comprises a needle base body, which is different from the prior art in that: the needle seat body cavity is hollow, the hollow body An inner sleeve type pull-back locking assembly 7 is disposed in the inner cavity, and the upper part of the needle seat body forms a replaceable needle fitting portion 1. The lower portion of the needle seat body forms an elastic sealing limit portion 2, the needle-changeable assembly portion 1 and the elastic seal The limiting portion 2 is formed as a unitary single body structure, and the annular sealing gap 3 is formed on the surface of the elastic sealing limiting portion 2, and the outer wall of the elastic sealing limiting portion 2 on the outer side of the annular buffering gap 3 forms an annular sealing limit engaging portion 4 The side wall of the elastic sealing limit portion 2 is provided with an anti-side rotation rib 5 . The elastic sealing limit portion enables the stable engagement between the needle holder body and the cylinder body, and achieves the effect of lightly withdrawing.
[0016] 本发明另一技术方案为， 一种用于安全自毁式注射器的可换针内针座结 构， 它包括针座本体， 其区别于现有技术在于： 所述针座本体内腔中空， 该中空 的内腔内设有内套式回拉锁定组件 7， 所述针座本体上部形成可换针装配部 1， 针座本体的下部形成弹性密封限位部 2， 可换针装配部 1和弹性密封限位部 2成 分体式装配结构， 弹性密封限位部 2表面开设有环状缓冲间隙 3， 环状缓冲间隙 3外侧的弹性密封限位部 2外壁形成环状密封限位卡合部 4， 弹性密封限位部 2 外壁处设有防侧旋凸筋 5。 [0016] Another technical solution of the present invention is a replaceable needle inner needle seat structure for a safe self-destructing syringe, which comprises a needle base body, which is different from the prior art in that: the needle seat body cavity Hollow, the hollow inner cavity is provided with an inner sleeve type pull-back locking assembly 7, the upper part of the needle seat body forms a replaceable needle fitting portion 1, and the lower part of the needle seat body forms an elastic sealing limit portion 2, which can be assembled by needle The portion 1 and the elastic sealing limit portion 2 are assembled in a body shape, and the annular sealing gap 3 is opened on the surface of the elastic sealing limiting portion 2, and the outer wall of the elastic sealing limiting portion 2 on the outer side of the annular buffering gap 3 forms an annular sealing limit card. Joint 4, elastic sealing limit 2 An anti-side rib 5 is provided at the outer wall.
[0017〗 在具体实施时， 所述可换针装配部 1处形成外螺旋纹装配部 6。  [0017] In a specific implementation, the outer spiral fitting portion 6 is formed at the interchangeable needle fitting portion 1.
[0018] 在具体实施时， 所述可换针装配部 1上部呈圆锥台状， 其锥度为 6: 100, 可换针装配部 1的下部外壁形成外螺旋纹装配部 6。  [0018] In the specific implementation, the upper portion of the interchangeable needle fitting portion 1 has a truncated cone shape with a taper of 6:100, and the outer outer wall of the replaceable needle fitting portion 1 forms an outer spiral fitting portion 6.
在具体实施时， 所述防侧旋凸筋 5的端部呈半圆弧状或锥状。 In a specific implementation, the end portion of the anti-side rib 5 has a semi-circular shape or a tapered shape.
10019] 在具体实施时， 所述可换针装配部 1 与弹性密封限位部 2之间的过度处 形成环状台阶 8或环状坡面。  10019] In an implementation, an excessive distance between the interchangeable needle fitting portion 1 and the elastic seal limiting portion 2 forms an annular step 8 or an annular slope.
[0020] 在具体实施时， 所述环状缓冲间隙 3 为环形槽结构， 其槽口至槽底的高 度为 0.05mm-4mm， 环状缓冲间隙 3的宽度为 0.05mm-4mm， 环状缓冲间隙 3外 侧槽壁与环状密封限位卡合部 4表面弧面弧顶的距离为 0.1mm-6mm， 环状缓冲 间隙 3外侧槽壁槽口处与环状密封限位卡合部 4外壁之间的距离为 0.1mm-6mm， 环状缓冲间隙 3 外侧槽壁槽底处与环状密封限位卡合部 4 外壁之间的距离为 0.1mm-6mm, 环状密封限位卡合部 4 的表面成弧面状， 环状密封限位卡合部 4 表面弧顶至弧面上边缘的距离小于弧顶至弧面下边缘的距离，所述环状密封限位 卡合部 4下部的弹性密封限位部 2外壁处形成环状凹陷 9。  [0020] In a specific implementation, the annular buffer gap 3 is an annular groove structure, the height from the notch to the bottom of the groove is 0.05mm-4mm, and the width of the annular buffer gap 3 is 0.05mm-4mm, ring buffer The distance between the outer groove wall of the gap 3 and the arc top of the surface of the annular seal limit engagement portion 4 is 0.1 mm-6 mm, and the outer groove wall groove of the annular buffer gap 3 and the outer wall of the annular seal limit engagement portion 4 The distance between the gaps is 0.1mm-6mm, and the distance between the bottom of the outer groove wall of the annular buffer gap 3 and the outer wall of the annular seal limit engagement portion 4 is 0.1mm-6mm, and the annular seal limit engagement portion The surface of the annular seal is 4, and the distance from the top of the annular seal to the edge of the arc is less than the distance from the top of the arc to the lower edge of the arc. The lower end of the annular seal is engaged. An annular recess 9 is formed at the outer wall of the elastic seal limiting portion 2.
[0021] 在具体实施时， 所述环状凹陷 9与环状缓冲间隙 3的槽底位于同一水平 面或高于环状缓冲间隙 3的槽底。 [0021] In a specific implementation, the annular recess 9 is located on the same horizontal surface as the groove bottom of the annular buffer gap 3 or higher than the groove bottom of the annular buffer gap 3.
[0022] 在具体实施时， 所述环状台阶 8下部的弹性密封限位部 2外壁处形成环 状密封圈装配凹槽 10， 该环状密封圈装配凹槽 10内套接有" 0"形密封胶圈 11。  [0022] In a specific implementation, an annular sealing ring fitting groove 10 is formed at an outer wall of the elastic sealing limiting portion 2 of the lower portion of the annular step 8. The annular sealing ring fitting groove 10 is sleeved with a "0" Shape sealing rubber ring 11.
[0023] 在具体实施时， 所述针座本体腔体内壁处形成至少一内针座环形限位槽 12, 针座本体腔体内设有内套式回拉锁定组件 7， 内套式回拉锁定组件 7外壁处 至少设置一与内针座环形限位槽 12相配合的限位凸环 13。 [0023] In a specific implementation, at least one inner needle ring annular limiting groove 12 is formed at the inner wall of the needle body cavity, and the inner sleeve type pull-back locking component 7 is provided in the needle body body cavity, and the inner sleeve type pull-back At least one of the limiting collars 13 that cooperate with the inner needle ring annular limiting groove 12 is disposed at the outer wall of the locking assembly 7.
[0024] 在具体实施时， 所述内套式回拉锁定组件 7 内腔中空， 其内腔内壁靠近 下端开口处形成环状卡合锁定部 14。 [0024] In a specific implementation, the inner sleeve type pull-back locking assembly 7 has a hollow inner cavity, and an inner wall of the inner cavity forms an annular engagement locking portion 14 near the lower end opening.
[0025] 在具体实施时， 所述环状卡合锁定部 14的上部形成环形凹槽 15， 环形凹 槽 15内侧壁 16的厚度为 0.01mm-3mm，环形凹槽 15内侧壁与环形凹槽 15外侧 壁 17 形成 2 度至 90 度夹角， 环形凹槽 15 内侧壁上端处形成的内直径为 1 mm- 80mm。  [0025] In a specific implementation, the upper portion of the annular locking locking portion 14 forms an annular groove 15, the inner side wall 16 of the annular groove 15 has a thickness of 0.01 mm - 3 mm, and the inner side wall and the annular groove of the annular groove 15 15 The outer side wall 17 forms an angle of 2 to 90 degrees, and the inner diameter formed at the upper end of the inner side wall of the annular groove 15 is 1 mm to 80 mm.
[0026] 在具体实施时， 所述环形凹槽 15的槽口宽度大于槽底宽度。 [0027] 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。 In a specific implementation, the annular groove 15 has a notch width greater than a groove bottom width. [0027] The above is a further detailed description of the present invention in conjunction with the specific preferred embodiments. It will be apparent to those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the invention.

Claims

权 利 要 求 书 Claim
1. 一种用于安全自毁式注射器的可换针内针座结构， 它包括针座本体， 其特征 在于： 所述针座本体内腔中空， 该中空的内腔内设有内套式回拉锁定组件 （7)， 所述针座本体上部形成可换针装配部（1)，针座本体的下部形成弹性密封限位部 A replaceable needle inner needle seat structure for a safe self-destructing syringe, comprising a needle base body, wherein: the needle base body is hollow, and the hollow inner cavity is provided with an inner sleeve type Pulling back the locking component (7), the upper part of the needle seat body forms a replaceable needle fitting part (1), and the lower part of the needle seat body forms an elastic sealing limit part
(2)， 可换针装配部（1)和弹性密封限位部（2)成一体式单体结构， 弹性密封 限位部（2)表面开设有环状缓冲间隙（3)， 环状缓冲间隙（3)外侧的弹性密封 限位部（2)外壁形成环状密封限位卡合部（4)， 弹性密封限位部（2)外壁处设 有防侧旋凸筋 （5)。 (2) The replaceable needle assembly portion (1) and the elastic seal limit portion (2) are integrated into a single unit structure, and the elastic seal limit portion (2) is provided with an annular buffer gap (3) on the surface thereof, and the annular buffer is provided. The outer wall of the elastic sealing limit portion (2) on the outer side of the gap (3) forms an annular seal limit engagement portion (4), and the outer wall of the elastic seal limit portion (2) is provided with an anti-side rotation rib (5).
2. 一种用于安全自毁式注射器的可换针内针座结构， 它包括针座本体， 其特征 在于： 所述针座本体内腔中空， 该中空的内腔内设有内套式回拉锁定组件 （7)， 所述针座本体上部形成可换针装配部（1)，针座本体的下部形成弹性密封限位部 2. A replaceable needle inner needle seat structure for a safe self-destructing syringe, comprising a needle base body, wherein: the needle base body is hollow, and the hollow inner cavity is provided with an inner sleeve type Pulling back the locking component (7), the upper part of the needle seat body forms a replaceable needle fitting part (1), and the lower part of the needle seat body forms an elastic sealing limit part
(2), 可换针装配部（1)和弹性密封限位部（2)成分体式装配结构， 弹性密封 限位部（2)表面开设有环状缓冲间隙（3)， 环状缓冲间隙（3)外侧的弹性密封 限位部（2)外壁形成环状密封限位卡合部（4), 弹性密封限位部（2)外壁处设 有防侧旋凸筋 （5)。 (2), the needle-removable assembly part (1) and the elastic sealing limit part (2) are assembled in a component manner, and the elastic sealing limit portion (2) is provided with an annular buffer gap (3), an annular buffer gap ( 3) The outer side of the elastic sealing limit portion (2) forms an annular seal limit engagement portion (4), and the outer side of the elastic seal limit portion (2) is provided with an anti-side rotation rib (5).
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 （1) 处形成外螺旋纹装配部 （6)。  3. The replaceable needle inner needle seat structure for a safe self-destructing syringe according to claim 1, wherein: the outer needle assembly portion (1) forms an outer spiral fitting portion (6) ).
4. 根据权利要求 3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 （1) 上部呈圆锥台状， 其锥度为 6: 100, W换针 装配部 （1) 的下部外壁形成外螺旋纹装配部 （6)。  4. The replaceable needle inner needle seat structure for a safe self-destructing syringe according to claim 3, wherein: the upper portion of the interchangeable needle fitting portion (1) has a truncated cone shape, and the taper thereof is 6: 100, The lower outer wall of the W-change fitting unit (1) forms an outer spiral fitting portion (6).
5. 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： 所述防侧旋凸筋 （5) 的端部呈半圆弧状或锥状。  5. The replaceable needle inner needle seat structure for a safe self-destructing syringe according to claim 1, wherein: the end of the anti-side rotation rib (5) has a semi-arc or a cone shape .
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 (1)与弹性密封限位部（2)之间的过度处形成环 状台阶 （8) 或环状坡面。  6. The replaceable needle inner needle seat structure for a safe self-destructing syringe according to claim 1, wherein: the replaceable needle fitting portion (1) and the elastic sealing limit portion (2) An excessively formed portion forms an annular step (8) or an annular slope.
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 （3) 为环形槽结构， 其槽口至槽底的高度为 0.05mm-4mm, 环状缓冲间隙 G) 的宽度为 0.05mm-4mm， 环状缓冲间隙 （3) 外侧槽壁与环状密封限位卡合部（4)表面弧面弧顶的距离为为 0.1mm-6mm, 环 状缓冲间隙 G )外侧槽壁槽口处与环状密封限位卡合部（4)外壁之间的距离为 为 0.1mm-6mm， 环状缓冲间隙（3 )外侧槽壁槽底处与环状密封限位卡合部（4) 外壁之间的距离为为 0.1mm-6mm， 环状密封限位卡合部 （4) 的表面成弧面状， 环状密封限位卡合部 （4) 表面弧顶至弧面上边缘的距离小于弧顶至弧面下边缘 的距离， 所述环状密封限位卡合部（4) 下部的弹性密封限位部（2)外壁处形成 环状凹陷 （9)。 7. The replaceable needle inner needle seat structure for a safe self-destructing syringe according to claim 1, wherein: the annular buffer gap (3) is an annular groove structure, the slot to the slot The height of the bottom is 0.05mm-4mm, the width of the annular buffer gap G) is 0.05mm-4mm, the annular buffer gap (3), the outer groove wall and the annular seal limit engagement part (4) surface arc surface top The distance is 0.1mm-6mm, ring The buffer gap G) the distance between the outer groove wall groove and the outer wall of the annular seal limit engagement portion (4) is 0.1mm-6mm, the annular buffer gap (3) is outside the groove wall groove bottom and the ring The distance between the outer wall of the sealing position limiting portion (4) is 0.1mm-6mm, and the surface of the annular sealing limit engaging portion (4) is curved, and the annular sealing limit engaging portion (4) The distance from the top of the surface 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, and the outer wall of the elastic sealing limit portion (2) of the annular sealing limit engaging portion (4) is formed into a ring shape. Depression (9).
8. 根据权利要求 7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（9)与环状缓冲间隙 G )的槽底位于同一水平面或高 于环状缓冲间隙 （3 ) 的槽底。  8. The replaceable needle inner needle seat structure for a safe self-destructing syringe according to claim 7, wherein: the annular recess (9) is located at the bottom of the annular buffer gap G) The same horizontal plane or the bottom of the groove above the annular buffer gap (3).
9. 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（8)下部的弹性密封限位部（2)外壁处形成环状密封 圈装配凹槽（10)，该环状密封圈装配凹槽（ 10)内套接有 "0"形密封胶圈（ 11 )。  9. The replaceable needle inner needle seat structure for a safe self-destructing syringe according to claim 6, wherein: the outer wall of the elastic sealing limit portion (2) of the lower part of the annular step (8) An annular sealing ring fitting groove (10) is formed, and the annular sealing ring fitting groove (10) is sleeved with a "0"-shaped sealing rubber ring (11).
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： 所述针座本体腔体内壁处形成至少一内针座环形限位槽 （12)， 针座 本体腔体内设有内套式回拉锁定组件 （7)， 内套式回拉锁定组件 （7 ) 外壁处至 少设置一与内针座环形限位槽 （12) 相配合的限位凸环 （13 )。  10 . The replaceable needle inner needle seat structure for a safety self-destructing syringe according to claim 1 , wherein: at least one inner needle seat annular limiting groove is formed at the inner wall of the needle body body cavity; (12), an inner sleeve type pull-back locking assembly (7) is provided in the body of the needle seat body, and at least one outer wall of the inner sleeve type pull-back locking assembly (7) is matched with the inner ring seat annular limiting groove (12) Limiting collar (13).
11. 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： 所述内套式回拉锁定组件 （7) 内腔中空， 其内腔内壁靠近下端开口 处形成环状卡合锁定部 （14)。  11. The replaceable needle inner needle seat structure for a safe self-destructing syringe according to claim 1, wherein: the inner sleeve type pull-back locking assembly (7) has a hollow inner cavity and a lumen thereof The inner wall forms an annular engagement locking portion (14) near the lower end opening.
12. 根据权利要求 11 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： 所述环状卡合锁定部 （14) 的上部形成环形凹槽 （15 )， 环形凹槽 12. The replaceable needle inner needle seat structure for a safe self-destructing syringe according to claim 11, wherein: an upper portion of the annular engagement locking portion (14) forms an annular groove (15) ), annular groove
( 15 ) 内侧壁 （16) 的厚度为 0.01mm-3mm， 环形凹槽（15 ) 内侧壁与环形凹槽 ( 15 ) 外侧壁 （17) 形成 2度至 90度夹角， 环形凹槽 （15 ) 内侧壁上端处形成 的内直径为 lmm-80mm。 (15) The inner side wall (16) has a thickness of 0.01 mm -3 mm , and the inner side wall of the annular groove (15) forms an angle of 2 to 90 degrees with the outer side wall (17) of the annular groove (15), and the annular groove ( 15) The inner diameter formed at the upper end of the inner side wall is lmm-80mm.
13. 根据权利要求 12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： 所述环形凹槽 U5 ) 的槽口宽度大于槽底宽度。  13. The replaceable needle inner needle seat structure for a self-destructing syringe according to claim 12, wherein: the annular groove U5) has a notch width greater than a groove bottom width.
PCT/CN2013/000191 2012-02-29 2013-02-26 Replaceable-needle inner needle base structure for use in safe self-destructing syringe WO2013127260A1 (en)

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