WO2011127750A1 - 钢针回缩针筒 - Google Patents

钢针回缩针筒 Download PDF

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Publication number
WO2011127750A1
WO2011127750A1 PCT/CN2011/000636 CN2011000636W WO2011127750A1 WO 2011127750 A1 WO2011127750 A1 WO 2011127750A1 CN 2011000636 W CN2011000636 W CN 2011000636W WO 2011127750 A1 WO2011127750 A1 WO 2011127750A1
Authority
WO
WIPO (PCT)
Prior art keywords
needle
inner plug
core rod
seat
head
Prior art date
Application number
PCT/CN2011/000636
Other languages
English (en)
French (fr)
Inventor
杨舟
Original Assignee
浙江康泰医疗器械有限公司
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
Priority claimed from CN2010201635945U external-priority patent/CN201921240U/zh
Priority claimed from CN201020163605XU external-priority patent/CN201840728U/zh
Priority claimed from CN2010101505185A external-priority patent/CN102218179A/zh
Priority claimed from CN2010101505058A external-priority patent/CN102218175A/zh
Application filed by 浙江康泰医疗器械有限公司 filed Critical 浙江康泰医疗器械有限公司
Priority to PCT/CN2011/000636 priority Critical patent/WO2011127750A1/zh
Publication of WO2011127750A1 publication Critical patent/WO2011127750A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3234—Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—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
    • A61M2005/3231—Proximal end of needle captured or embedded inside piston head, e.g. by friction or hooks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3234—Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user
    • A61M2005/3241—Needle retraction energy is accumulated inside of a hollow plunger rod

Definitions

  • the invention belongs to the technical field of medical instruments, and particularly relates to a steel needle retracting syringe.
  • Syringe is a commonly used medical device for aspirating liquids and injections.
  • syringes widely used in medical institutions are used in a single use.
  • this theoretical “single" use of the syringe still has the danger of being reused by the lawless elements and the cross-infection caused by the exposure of the steel needle during the waste treatment process.
  • the single-use needle existing in the domestic market Due to the lack of structure and technical solutions, the tube cannot guarantee the implementation of no cross-infection injection, and the medical staff will have more needle-needle damage caused by using ordinary syringes than other accidents, and inevitably cross-infection of bacteria will occur. , posing a serious threat to the health of medical staff.
  • an object of the present invention is to provide a technical solution for a steel needle retracting syringe capable of self-destructing a steel needle.
  • the steel needle retracting syringe comprises a cylinder body, a core rod disposed in the barrel body cavity, a needle seat disposed at the head of the barrel body cavity, a steel needle disposed on the needle seat, and a head disposed on the head of the core rod a sealing member, characterized in that: the needle seat outer sleeve is provided with a seat cover, the lower end of the seat cover is sealingly sleeved with the cylindrical body head of the cylinder body, and the upper end of the seat cover is in contact with the needle seat and can slide relative to each other, the needle seat
  • the card is arranged in the inner cavity of the cylinder head, and the bottom end of the needle seat It can be snap-fitted with an inner plug that is elastically disposed in the core rod.
  • the steel needle retracting cylinder is characterized in that the seat cover comprises a fixing sleeve and a sealing ring fixed in the fixing sleeve, the sealing ring sleeve is arranged on the needle seat and is in sealing contact with the needle seat and can slide relative to each other. , the sleeve of the fixed sleeve is connected with the needle sleeve.
  • the steel needle retracting cylinder is characterized in that the upper end opening of the needle seat communicates with the steel needle, and the lower end opening of the needle seat communicates with the inner cavity of the cylinder.
  • the steel needle retracting cylinder is characterized in that at least two lobes extend from the lower end of the barrel head, and a card step for engaging the needle seat is arranged on the inner side of the upper end of the lobes, and the inner side of the lower end of the lobes can be disposed
  • the axial force generated by the front pusher rod is converted into an inclined surface which causes the lateral force of the cylinder to expand.
  • the steel needle retracting syringe is characterized in that the lower end of the needle seat of the needle seat is engaged with the disc provided at the bottom of the inner cavity of the barrel head, and the card joint is arranged at the bottom of the needle seat, and the card joint can be set
  • the active barbs on the inner plug are snap-fitted.
  • the steel needle retracting cylinder is characterized in that at least two needle seat barbs are arranged at the bottom of the needle seat, and the needle seat barbs can be engaged with the inner plug card joints disposed on the inner plugs.
  • the needle barb is engaged with the flange provided at the bottom of the inner cavity of the cylinder head, and the needle seat head is provided with a step surface of the needle seat, and the step surface of the needle seat is engaged with the seat cover.
  • the steel needle retracting cylinder is characterized in that the inner plug is disposed in the inner cavity of the core rod, the inner plug is sleeved to be provided with the compressed elastic steel wire, and the elastic steel wire is provided at one end by the inner core of the core rod The circlip step is stuck, and the other end is caught by the inner plug circlip step provided on the inner plug.
  • the steel needle retracting cylinder is characterized in that the top surface of the inner plug is provided with a groove, and the side surface of the groove extends at least one movable barb inward and backward, and the movable barb can be arranged with the card joint at the bottom of the needle seat.
  • the card is arranged, the side of the inner plug head of the inner plug is in sealing contact with the core rod and can slide relative to each other, and the bottom of the inner plug of the inner plug is engaged with the movable chuck provided on the core rod, and the movable chuck head is connected with the sliding sleeve. , the bottom end of the sliding sleeve is set
  • the step step, the limit step can be matched with the bottom of the cylinder body of the cylinder body.
  • the steel needle retracting cylinder is characterized in that the top surface of the inner plug is provided with an inner plug connector, and the inner plug card joint can be arranged with the needle seat barb provided at the bottom of the needle seat, the inner plug An inner plug diameter is arranged on the side of the inner plug head, and the inner plug diameter is engaged with the core rod diameter provided on the core rod to fix the inner plug in the core rod.
  • the steel needle retracting cylinder is characterized in that the core rod is sleeved with a sealing member, and the upper end of the sealing member is sealingly engaged with the inner plug.
  • the above-mentioned steel needle retracting syringe has a simple structure and a reasonable design, and the self-destruction of the steel needle is completed by the cooperation between the inner plug and the needle seat which are elastically arranged in the core rod.
  • the invention has the following advantages: ⁇ 1) The syringe is destroyed and prevented from being used repeatedly; 2) The steel needle is automatically retracted, which not only reduces the needle pulling action, but also prevents the needle stick Injury; 3) The resistance is small when the type is destroyed, and the patient is not suffering; 4) The needle sleeve, the steel needle, the needle seat and the seat cover are integrally replaced by a needle, which can be replaced; 5) the contact surface between the seat cover and the cylinder Can be made into GB/.T 1962. 1 or GB/T 1962. 2 standard medical joints, expanding its scope of application; 6) stable structure, can be assembled automatically, suitable for mass production.
  • Figure 1 is a schematic view showing the overall assembly structure of Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural view of an integral interchangeable needle according to Embodiment 1 of the present invention.
  • FIG. 3 is a combination diagram of the needle seat loosening of the embodiment 1 and the bottom hook of the needle seat and the activity hook of the inner plug;
  • Figure 4 is a view showing the release of the movable chuck of the first embodiment of the present invention.
  • Figure 5 is a diagram showing the movable card head eversion and steel needle retraction of Embodiment 1 of the present invention
  • Figure 6 is a schematic view showing the overall assembly structure of Embodiment 2 of the present invention.
  • Figure 7 is a view showing the combination of the inner plug connector and the needle barb of the embodiment 2 of the present invention
  • Figure 8 is a loose view of the inner plug diameter and the core rod diameter of the second embodiment of the present invention
  • Figure 9 is a retraction diagram of a steel needle according to Embodiment 2 of the present invention.
  • Figure 10 is a schematic view showing the structure of Embodiment 3 of the present invention.
  • the steel needle retracting syringe is composed of a steel needle 1, a needle sleeve 2, a needle seat 3, a seat cover 4, a cylinder 5, a sealing member 6, a core rod 7, and the like.
  • the sleeve 2 is sleeved outside the sleeve 41 of the sleeve 4, and the sleeve 41 is sleeved outside the sealing ring 42 of the sleeve 4 and is in sealing contact with the sleeve 42.
  • the sealing ring 42 is sleeved outside the needle holder 3 and is in sealing contact with the needle holder 3 and
  • the sleeve 41 can be sealed and sleeved with the sleeve 51; the needle holder 3 is located in the inner cavity of the barrel 5, the needle holder 3 is hollow, and the upper end opening 31 communicates with the steel needle 1, and the lower end opening 32 Connect the inner cavity of the cylinder 5.
  • the inner portion of the barrel head 51 of the barrel 5 extends downwardly from at least two discs 52.
  • the inner side of the upper end of the disc 52 has a latching step 521 that engages the lower end 34 of the hub.
  • the lower end of the disc 52 has an inclined surface 522.
  • the inclined surface 522 is capable of converting the axial force of the cylinder generated by the front pusher 7 into a lateral force of the cylinder which causes the expansion of the disc 52.
  • a card joint 33 is provided at the bottom of the hub 3, and the card joint 33 can be engaged with the movable barb 811 provided on the inner plug 8.
  • the inner plug is disposed in the cavity of the core rod 7, and the head of the core rod 7 is sleeved and provided with a sealing member 6, dense The seal 6 ensures the airtightness of the inner cavity of the cylinder 5.
  • At least one movable chuck 71 is disposed on the side of the core rod 7.
  • the movable chuck 71 is sleeved and provided with a sliding sleeve 9.
  • the bottom of the sliding sleeve 9 is provided with a limiting step 91.
  • the limiting step 91 can be matched with the bottom 53 of the cylinder. .
  • the sliding sleeve 9 coagulates the movable chuck 71, and the cohesive movable chuck 71 catches the inner plug 8 to fix the inner plug 8 in the core rod 7.
  • the top surface of the inner plug 8 has a groove 81.
  • the side surface of the groove 81 extends at least one movable barb 811 inward and backward.
  • the movable barb 811 can be expanded and reduced. Force, if the reverse force is applied, the movable barb 811 is cohesive, and the engagement force with the card connector 33 at the bottom of the needle seat is strengthened to prevent loosening.
  • the inner plug head side 82 is in sealing contact with the core rod 7 and is relatively slidable, and the inner plug 8 is jacketed with the compressed elastic steel wire 10, the elastic steel wire 10 end is caught by the core rod spring step 72, and the other end is blocked by the inner plug.
  • the spring step 83 is stuck.
  • the needle sleeve 2, the steel needle 1, the needle holder 3 and the seat cover 4 constitute an integral needle changeable, wherein the seat cover 4 comprises a fixing sleeve 41 and a sealing ring 42.
  • the inner plug 8 pushes and applies the axial force of the cylinder to the inner cavity disc 52 of the cylinder 5, and the cylinder body acts under the inclined surface 522 of the lower end of the disc 52.
  • the axial force is converted into the lateral force of the cylinder, which causes the disc 52 to expand outward.
  • the latching step 521 of the disc 52 is expanded and loosened with the lower end 34 of the needle seat, and the card joint 33 and the inner plug 8 at the bottom of the needle seat are 8
  • the activity barbs 811 are combined, and when combined with the inner bar 8, the activity barbs 811 are expanded to reduce the bonding force.
  • the core rod 7 continues to push forward, and the limit step 91 of the sliding sleeve 9 is caught at the bottom 53 of the cylinder body, and the sliding sleeve 9 stops moving forward, and slides back relative to the core rod 7, resulting in movement with the core rod 7.
  • the chuck 71 is disengaged and the movable chuck 71 is released.
  • the movable chuck 71 is loosened and then turned outward, and the inner plug 8 is loosened.
  • the inner plug 8 is retracted under the action of the elastic steel wire 10 compressed by the inner plug 8, and the movable barb 811 of the inner plug passes through the needle.
  • the card connector 33 at the bottom of the seat 3 pulls the needle holder 3, and when pulled, the movable barb 81 1 of the inner plug 8 has a cohesive tendency, and can prevent the needle seat 3
  • the bottom card connector 33 is released, and the needle holder 3 and the steel needle 1 are slid back relative to the seat cover 4 until they are completely retracted into the inner cavity of the core rod 7. Complete the self-destruction of the steel needle 1.
  • the steel needle retracting cylinder was changed on the basis of the structure of the first embodiment.
  • At least two needle barbs 36 are disposed on the bottom of the needle holder 3, and an inner plug connector 85 is disposed on the top surface of the inner plug 8, and the inner plug connector 85 can be engaged with the needle barb 36.
  • the needle barb 36 is engaged with the disc 52 disposed at the bottom of the inner cavity of the cylinder head 51.
  • the head of the needle seat 3 is provided with a needle step surface 35, and the needle seat surface 35 is engaged with the seat cover 4, the needle seat
  • the arrangement of the step faces 35 prevents the needle hub 3 from being ejected by the inner plug 8.
  • the inner plug diameter 86 is provided on the inner plug head side surface 82 of the inner plug 8
  • the core rod diameter 73 is provided on the side surface of the core rod 7, and the inner plug diameter 86 and the core rod diameter 73 are engaged. Acting to fix the inner plug 8 in the core rod 7 instead of the action of the movable chuck head 71 in the embodiment 1. And the upper end of the sealing member 6 sleeved on the core rod 7 is sealingly fitted with the inner plug 8.
  • the inner plug connector 85 of the inner plug 8 is caught by the needle seat barb 36 at the bottom of the needle hub 3, and the head inner cavity flap 52 of the barrel 5 is The inner plug 8 is opened, the needle seat 3 is loose as shown in Fig. 8, the core rod 7 continues to push forward, and the inner plug 8 is not advanced on the needle seat 3, and is moved backward relative to the core rod 7.
  • the inner plug diameter of the inner plug 8 breaks through the core rod diameter 73 of the core rod 7, and the elastic steel wire 10 is in a release state.
  • the steel needle retracting cylinder was changed on the basis of the structure of the second embodiment.
  • the inner plug bottom 84 of the inner plug 8 is caught by the core rod diameter 73 provided on the core rod, and the inner plug card of the embodiment 2 is changed.
  • the matching structure of the diameter 86 and the core rod diameter 73 can finally reach the same technique as the first embodiment and the second embodiment.

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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)

Description

说明书
钢针回缩针筒 技术领域
本发明属于医疗器械技术领域， 具体涉及一种钢针回缩针筒。
背景技术
针筒是一种常用的医疗器具， 用来抽吸液体及注射， 目前医疗机构广泛使 用的针筒均采用单次使用。 然而， 这种理论上 "单次" 使用的针筒仍存在被不 法分子重复使用的危险以及废弃物处理过程中钢针外露扎伤人体导致的交叉感 染隐患， 国内市场上存在的单次使用针筒由于其结构和技术方案存在不足， 不 能保证无交叉感染注射的实施， 而医护人员因使用普通针筒引起的针刺损伤明 显多于其他意外造成的损伤， 不可避免的会出现病菌的交叉感染， 给医护人员 的人身健康带来了严重威胁。
美国疾病预防与控制中心全球艾滋病项目中国主任叶雷指出， 解决危险注 射的最好办法是使用单次使用毁形打针筒。 1994 年 WHO (世界卫生组织） 提出 无害注射的要求与定义： 对接受者无害， 对使用者无害， 对环境和他人无害。
发明内容
针对现有技术存在的问题， 本发明的目的在于设计提供一种钢针能够自毁 的钢针回缩针筒技术方案。
所述的钢针回缩针筒， 包括筒体， 设置在筒体内腔的芯杆， 设置在筒体内 腔头部的针座、 设置在针座上的钢针及设置在芯杆头部的密封件， 其特征在于 所述的针座外套接设置座套， 座套的下端与筒体的筒体头部密封套接设置， 座 套的上端与针座触接并可相对滑动， 针座卡接设置在筒体头部内腔， 针座底端 可与弹性设置在芯杆中的内塞卡接配合。
所述的钢针回缩针筒， 其特征在于所述的座套包括固定套和固定在固定套 内的密封圈， 密封圈套接设置在针座上并与针座密封触接并可相对滑动， 固定 套外套接设置针套。
所述的钢针回缩针筒， 其特征在于所述的针座的上端开口与钢针相通， 针 座的下端开口与筒体内腔相通。
所述的钢针回缩针筒， 其特征在于所述的筒体头部下端延伸出至少两个卡 瓣， 卡瓣上端内侧设置能够卡接针座的卡位台阶， 卡瓣下端内侧设置能够将前 推芯杆产生的筒体轴向力转换为导致卡瓣外扩的筒体横向力的倾斜面。
所述的钢针回缩针筒， 其特征在于所述的针座的针座下端与筒体头部内腔 底部设置的卡瓣卡接设置， 针座底部设置卡接头， 卡接头可与设置在内塞上的 活动倒钩卡接配合。
. 所述的钢针回缩针筒， 其特征在于所述的针座的底部至少设置两个针座倒 钩， 针座倒钩可与设置在内塞上的内塞卡接头卡接配合， 针座倒钩与筒体头部 内腔底部设置的卡瓣卡接配合， 所述的针座头部设置针座台阶面， 针座台阶面 与座套卡接配合。
所述的钢针回缩针筒， 其特征在于所述的内塞设置于芯杆的内腔， 内塞上 套接设置被压缩的弹性钢丝， 弹性钢丝一端被芯杆内腔设置的芯杆卡簧台阶卡 住， 另一端被设置在内塞上的内塞卡簧台阶卡住。
所述的钢针回缩针筒， 其特征在于所述的内塞顶面设置凹槽， 凹槽侧面向 内后方延伸出至少一个活动倒勾， 活动倒勾可与针座底部设置的卡接头卡接设 置， 内塞的内塞头部侧面与芯杆密封接触并可相对滑动， 内塞的内塞底部与设 置在芯杆上的活动卡头卡接配合， 活动卡头外套接设置滑套， 滑套底端设置限 位台阶， 限位台阶可与筒体的筒体底部挡接配合。
所述的钢针回缩针筒， 其特征在于所述的内塞顶面设置内塞卡接头， 内塞 卡接头可与针座底部设置的针座倒钩卡接设置， 所述的内塞的内塞头部侧面上 设置内塞卡径， 内塞卡径与设置在芯杆上的芯杆卡径卡接配合将内塞固定在芯 杆中。
所述的钢针回缩针筒， 其特征在于所述的芯杆头部套接设置密封件， 密封 件的上端与内塞密封配合。
上述的钢针回缩针筒， 结构简单， 设计合理， 利用弹性设置在芯杆中的内 塞和针座之间的配合， 完成钢针的自毁。 本发明与现有技术中的针筒相比， 具 有以下优点. · 1 ) 针筒用完即毁， 防止重复使用； 2 ) 钢针自动回缩， 不但减少 了拔针动作， 还防止针刺伤； 3 ) 毁型时阻力小， 不造成病人痛苦； 4 ) 针套、 钢针、 针座和座套 4个部件构成一体可换针， 可更换； 5 ) 座套与筒体的接触面 都可做成符合 GB/.T 1962. 1或 GB/T 1962. 2的标准医用接头， 扩大了其适用范 围； 6 ) 结构稳定， 可自动组装， 适合量产。
附图说明
' 图 1为本发明中实施例 1的整体装配结构示意图；
图 2为本发明中实施例 1的一体可换针结构示意图；
图 3为本发明中实施例 1 的针座松脱及针座底部倒勾和内塞活动倒勾结合 图；
图 4为本发明中实施例 1的活动卡头松脱图；
图 5为本发明中实施例 1的活动卡头外翻及钢针回缩图；
图 6为本发明中实施例 2的整体装配结构示意图；
图 7为本发明中实施例 2的内塞卡接头与针座倒钩结合图； 图 8为本发明中实施例 2的内塞卡径和芯杆卡径松脱图；
图 9为本发明中实施例 2的钢针回缩图；
图 10为本发明中实施例 3的结构示意图。
图中： 1-钢针； 2-针套； 3-针座； 31-上端开口； 32-下端开口； 33-卡接头; 34 -针座下端； 35-针座台阶面； 36-针座倒钩； 4-座套； 41-固定套； 42-密封圈；
5-筒体； 51-筒体头部； 52-卡瓣； 521-卡位台阶； 522-倾斜面； 53-筒体底部；
6-密封件； 7-芯杆； 71-活动卡头； 72-芯杆卡簧台阶； 73-芯杆卡径； 8-内塞； 81-凹槽； 81 1 -活动倒钩； 82-内塞头部侧面； 83 -内塞卡簧台阶； 84-内塞底部； 85 -内塞卡接头； 86-内塞卡径； 9-滑套； 91-限位台阶。
具体实施方式
以下结合说明书附图来进一步说明本发明。
实施例 1
如图 1所示， 钢针回缩针筒， 由钢针 1、 针套 2、 针座 3、 座套 4、 筒体 5、 密封件 6、 芯杆 7等组成。
针套 2套在座套 4的固定套 41外， 固定套 41套在座套 4的密封圈 42外并 与之密封接触， 密封圈 42套在针座 3外， 与针座 3密封接触并可以相对移动， 固定套 41与筒体 5的筒体头部 51可进行密封套接； 针座 3位于筒体 5内腔， 针座 3中空， 其上端开口 31连通钢针 1， 下端开口 32连通筒体 5内腔。
筒体 5的筒体头部 51内腔向下延伸出至少两个卡瓣 52， 卡瓣 52上端内侧 具有卡合针座下端 34的卡位台阶 521，卡瓣 52下端具有倾斜面 522。倾斜面 522 能够将前推芯杆 7产生的筒体轴向力转换为导致卡瓣 52外扩的筒体横向力。
针座 3的底部设置卡接头 33，卡接头 33能够与设置在内塞 8上的活动倒钩 811卡接。 内塞设置在芯杆 7的空腔中， 芯杆 7头部外套接设置了密封件 6， 密 封件 6保证了筒体 5内腔的气密性。芯杆 7的侧面至少设置了一个活动卡头 71， 活动卡头 71外套接设置了滑套 9， 滑套 9底部设置了限位台阶 91， 限位台阶 91 能够与筒体底部 53挡接配合。 滑套 9将活动卡头 71内聚， 内聚的活动卡头 71 将内塞 8卡住， 从而将内塞 8固定在芯杆 7中。
内塞 8顶面具有凹槽 81， 凹槽 81侧面向内后方延伸出至少一个活动倒勾 811， 活动倒勾 81 1与针座底部卡接头 33结合时， 活动倒勾 811可外扩减少结 合力， 如果施加反向的作用力拉脱时， 活动倒勾 811 内聚， 加强与针座底部卡 接头 33的卡接力防止松脱。 内塞头部侧面 82与芯杆 7密封接触并可相对滑动， 内塞 8外套有被压缩的弹性钢丝 10，弹性钢丝 10—端被芯杆卡簧台阶 72卡住， 另一端被内塞卡簧台阶 83卡住。
如图 2所示， 针套 2、 钢针 1、 针座 3和座套 4四个部件构成一体可换针， 其中座套 4包括固定套 41和密封圈 42。
如图 3所示， 随着芯杆 7前推， 内塞 8随之前推并向筒体 5内腔卡瓣 52施 加筒体轴向力，在卡瓣 52下端倾斜面 522作用下，筒体轴向力转为筒体横向力， 导致卡瓣 52外扩， 卡瓣 52的卡位台阶 521随之外扩并与针座下端 34松脱， 同 时针座底部的卡接头 33与内塞 8的活动倒勾 811结合， 结合时内塞 8的活动倒 勾 811外扩以减少结合力。
如图 4所示， 芯杆 7继续前推， 滑套 9的限位台阶 91卡在筒体底部 53， 滑 套 9停止前移， 相对于芯杆 7后滑， 导致与芯杆 7的活动卡头 71脱离接触， 活 动卡头 71松脱。
如图 5所示， 活动卡头 71松脱后外翻， 松脱内塞 8， 内塞 8在被其压缩的 弹性钢丝 10的伸长作用下后缩， 内塞的活动倒勾 811通过针座 3底部的卡接头 33拉动针座 3， 拉动时由于内塞 8的活动倒勾 81 1有内聚倾向， 能防止与针座 3 底部的卡接头 33松脱， 针座 3和钢针 1相对座套 4后滑， 直至完全缩入芯杆 7 内腔。 完成钢针 1的自毁。
实施例 2
如图 6所示， 钢针回缩针筒在实施例 1的结构基础上进行改变。 针座 3的 底部至少设置两个针座倒钩 36， 内塞 8的顶面上设置内塞卡接头 85， 内塞卡接 头 85可与针座倒钩 36卡接配合。 针座倒钩 36与筒体头部 51 内腔底部设置的 卡瓣 52卡接配合， 针座 3头部设置针座台阶面 35， 针座台阶面 35与座套 4卡 接配合， 针座台阶面 35的设置防止针座 3被内塞 8顶出。
同时在内塞 8的内塞头部侧面 82上设置的内塞卡径 86，在芯杆 7的侧面上 设置芯杆卡径 73， 利用内塞卡径 86和芯杆卡径 73的卡接作用将内塞 8固定在 芯杆 7中， 替代实施例 1中活动卡头 71的作用。 并且套接在芯杆 7上的密封件 6的上端与内塞 8密封配合。
如图 7所示， 随着芯杆 7前推， 内塞 8的内塞卡接头 85与针座 3底部的针 座倒钩 36卡住， 并且筒体 5的头部内腔卡瓣 52被内塞 8撑开， 针座 3处于松 如图 8所示， 芯杆 7继续前推， 内塞 8顶在针座 3上无法前移， 相对芯杆 7 后移。 内塞 8的内塞卡径 86突破芯杆 7的芯杆卡径 73， 弹性钢丝 10处于可释 放状态。
如图 9所示，在弹性钢丝 10的作用下，钢针 1被内塞 8拉进筒体 5的内腔， 完成钢针 1的自毁。 '
实施例 3
如图 10所示， 钢针回缩针筒在实施例 2的结构基础上进行改变。 利用设置 在芯杆 Ί上的芯杆卡径 73卡接住内塞 8的内塞底部 84，改变实施例 2中内塞卡 径 86与芯杆卡径 73的配合结构， 其最后也能达到与实施例 1和 2相同的技术

Claims

权利要求书
1.钢针回缩针筒， 包括筒体 （5)， 设置在筒体 （5) 内腔的芯杆 （7)， 设置 在筒体 （5) 内腔头部的针座 （3)、 设置在针座 （3) 上的钢针 （1) 及设置在芯 杆 （7) 头部的密封件 （6)， 其特征在于所述的针座 （3) 外套接设置座套 （4)， 座套 （4) 的下端与筒体 （5) 的筒体头部 （51) 密封套接设置， 座套 （4) 的上 端与针座 （3) 触接并可相对滑动， 针座 （3) 卡接设置在筒体头部 （51) 内腔， 针座 （3) 底端可与弹性设置在芯杆 （7) 中的内塞 （8) 卡接配合。
2.如权利要求 1所述的钢针回缩针筒， 其特征在于所述的座套 （4) 包括固 定套 （41) 和固定在固定套 （41) 内的密封圈 （42)， 密封圈 （42) 套接设置在 针座 （3) 上并与针座 （3) 密封触接并可相对滑动， 固定套 （41) 外套接设置 针套 （2)。
3.如权利要求 1所述的钢针回缩针筒， 其特征在于所述的针座 （3) 的上端 开口 （31) 与钢针 （1) 相通， 针座 （3) 的下端开口 （32) 与筒体 （5) 内腔相 通。
4.如权利要求 1 所述的钢针回缩针筒， 其特征在于所述的筒体头部 （51) 下端延伸出至少两个卡瓣 （52)， 卡瓣 （52) 上端内侧设置能够卡接针座 （3) 的卡位台阶 （521)， 卡瓣 （52) 下端内侧设置能够将前推芯杆 （7) 产生的筒体 轴向力转换为导致卡瓣 （52) 外扩的筒体横向力的倾斜面 （522)。
5.如权利要求 1所述的钢针回缩针筒， 其特征在于所述的针座 （3) 的针座 下端 (34) 与筒体头部 (51) 内腔底部设置的卡瓣 (52) 卡接设置， 针座 (3) 底部设置卡接头 （33)， 卡接头 （33)可与设置在内塞（8)上的活动倒钩（811) 卡接配合。
6.如权利要求 1所述的钢针回缩针筒， 其特征在于所述的针座 （3) 的底部 至少设置两个针座倒钩 （36)， 针座倒钩 (36) 可与设置在内塞 (8) 上的内塞 卡接头 (85) 卡接配合， 针座倒钩 (36) 与筒体头部 （51) 内腔底部设置的卡 瓣 (52) 卡接配合， 所述的针座 (3) 头部设置针座台阶面 (35)， 针座台阶面 (35) 与座套 （4) 卡接配合。
7.如权利要求 1所述的钢针回缩针筒， 其特征在于所述的内塞 （8) 设置于 芯杆（7)的内腔， 内塞（8)上套接设置被压缩的弹性钢丝（10)， 弹性钢丝（10) 一端被芯杆（7)内腔设置的芯杆卡簧台阶（72)卡住， 另一端被设置在内塞（8) 上的内塞卡簧台阶 （83) 卡住。
8.如权利要求 5所述的钢针回缩针筒， 其特征在于所述的内塞 （8) 顶面设 置凹槽 （81), 凹槽 （81) 侧面向内后方延伸出至少一个活动倒勾 （811),..活动 倒勾 （811) 可与针座 （3) 底部设置的卡接头 （33) 卡接设置， 内塞 （8) 的内 塞头部侧面 （82) 与芯杆 （7) 密封接触并可相对滑动， 内塞 （8) 的内塞底部
(84) 与设置在芯杆 (7) 上的活动卡头 (71) 卡接配合， 活动卡头 (71) 外套 接设置滑套 （9)， 滑套 （9) 底端设置限位台阶 （91)， 限位台阶 （91) 可与筒 体 (5) 的筒体底部 (53) 挡接配合。
9.如权利要求 6所述的钢针回缩针筒， 其特征在于所述的内塞 （8) 顶面设 置内塞卡接头（85)， 内塞卡接头 (85)可与针座 (3)底部设置的针座倒钩 (36) 卡接设置， 所述的芯杆 （7) 内设置的芯杆卡径 （73)， 芯杆卡径 （73) 可与内 塞 （8) 的内塞头部侧面 （82) 上设置的内塞卡径 （86) 或内塞底部 （84) 卡接 配合将内塞.（8) 固定在芯杆 （7) 中。
10.如权利要求 9所述的钢针回缩针筒， 其特征在于所述的芯杆 （7) 头部 套接设置密封件 （6)， 密封件 （6) 的上端与内塞 （8) 密封配合。
PCT/CN2011/000636 2010-04-14 2011-04-12 钢针回缩针筒 WO2011127750A1 (zh)

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