WO2016169156A1 - 一种安全注射器 - Google Patents

一种安全注射器 Download PDF

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Publication number
WO2016169156A1
WO2016169156A1 PCT/CN2015/086704 CN2015086704W WO2016169156A1 WO 2016169156 A1 WO2016169156 A1 WO 2016169156A1 CN 2015086704 W CN2015086704 W CN 2015086704W WO 2016169156 A1 WO2016169156 A1 WO 2016169156A1
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WIPO (PCT)
Prior art keywords
pusher
screw
push rod
boss
rubber plug
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PCT/CN2015/086704
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English (en)
French (fr)
Inventor
梁栋科
林森
李涛
吴德华
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上海康德莱企业发展集团医疗器械有限公司
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Publication of WO2016169156A1 publication Critical patent/WO2016169156A1/zh

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    • 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
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/50—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/50—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
    • A61M5/5066—Means for preventing re-use by disconnection of piston and piston-rod

Definitions

  • the invention relates to a safety syringe and belongs to the technical field of medical instruments.
  • syringes are generally disposable syringes that are used only once, but the outer casing and screw of existing syringes are generally designed in one piece. This design is reversible after use, ie used syringes, Once the needle is placed on the screw, it can be reused, which will damage the health of the consumer.
  • the object of the present invention is to overcome the defects of the prior art and provide a safety syringe with simple structure and convenient operation.
  • the outer sleeve and the screw are designed separately, and the use of the used syringe is obviously destructive, and the syringe can be prevented from being reused.
  • a technical solution for achieving the above object is: a safety syringe comprising a jacket, a push rod, a rubber plug and a screw, the jacket being vertically disposed, the push rod being inserted into the jacket from a lower end opening of the jacket, The rubber plug is sleeved on the push rod and located in the outer sleeve, wherein:
  • the upper part of the outer peripheral surface of the push rod is provided with a rubber plug mounting opening and a breaking gap in sequence from top to bottom, and the rubber plug is sleeved on the rubber plug mounting opening;
  • a top of the push rod is provided with a pusher boss, the pusher boss is divided into upper and lower portions, and upper and lower portions of the pusher boss are integrally formed, and an upper portion of the pusher boss is conical.
  • a diameter of a lower surface of an upper portion of the pusher boss is larger than a diameter of an upper surface of a lower portion of the pusher boss, and a joint of an upper portion of the pusher boss and a lower portion of the pusher boss forms a convex portion edge;
  • a lower portion of the outer peripheral surface of the screw is provided with a rib, a detachment and a spring snap from the top to the bottom, and an annular V-shaped groove is formed at a joint of the outer peripheral surface of the screw and the spring clip.
  • the spring clip is contracted along a radial direction of the screw, and the inside of the screw is provided with a push rod claw;
  • the screw is inserted into the outer casing from an upper end opening of the outer casing, and an inner circumferential surface of the outer casing is provided with a limiting rib mounting groove that cooperates with the limiting rib, and an inner circumferential surface of the outer casing is disposed a retaining groove mounting groove matched with the retaining rib, the inner peripheral surface of the outer sleeve is provided with a spring snap mounting groove matched with the spring snap, the limiting rib, the retaining rib and The spring clips are latched one by one in the limit rib mounting groove, the detachment rib mounting groove and the spring snap mounting groove;
  • the pusher boss is inserted into the screw from the lower end opening of the screw, and the pusher boss is engaged in the pusher claw, and the upper part of the pusher boss is located in the push Above the lever jaw, a lower portion of the pusher boss is located inside the pusher jaw, and a top end of the pusher pawl is non-contacting the flange.
  • the rubber plug has a rectangular cross section, and the upper surface of the rubber plug has a downwardly concave curved surface structure, and the lower surface of the rubber plug has an upwardly concave curved surface structure.
  • the inner surface of the rubber plug has an arcuate structure that is outwardly concave, and the outer surface of the rubber plug has a curved surface structure that is inwardly recessed.
  • the pusher claw is composed of four spring pieces, and the four spring pieces enclose an inner hollow structure.
  • the spring clip is connected to the spring snap mounting groove by an interference fit.
  • the detachment preventing rib has a semicircular convex structure
  • the detachment preventing mounting groove has a semicircular concave structure
  • the safety syringe of the invention has the advantages of simple structure, convenient operation, separate design of the outer sleeve and the screw, and the destructive effect on the used syringe is obvious, and the syringe can be prevented from being repeatedly used.
  • the used syringe when the push rod is retracted, together with the screw, the product is lost, and the product is used for safety purposes.
  • the push rod is retracted to the final position, the push rod is broken from the broken gap, which can The role of secondary protection.
  • Figure 1 is a structural view of a safety syringe of the present invention
  • Figure 2 is a cross-sectional view taken along line A-A of Figure 1;
  • Figure 3 is an enlarged view of a portion B of Figure 2;
  • Figure 4 is a structural view of a push rod of the safety syringe of the present invention.
  • Figure 5 is a schematic view showing the connection of the screw and the outer sleeve of the safety syringe of the present invention
  • Figure 6 is a cross-sectional view of the rubber stopper of the safety syringe of the present invention.
  • a safety syringe comprising a casing 1, a push rod 2, a rubber stopper 3 and a screw 4, the outer casing 1 is vertically disposed, and the push rod 2 is from the lower end of the outer casing 1.
  • the opening is inserted into the outer casing 1, and the rubber stopper 3 is sleeved on the push rod 2 and located inside the outer casing 1, and the screw opening 4 is inserted into the outer casing 1 from the upper end opening of the outer casing 1.
  • an upper portion of the outer peripheral surface of the push rod 2 is provided with a rubber plug mounting opening 21 and a breaking notch 22 from top to bottom, and the rubber plug 3 is sleeved on the rubber plug mounting opening 21; the top end of the push rod 2 A pusher boss 23 is disposed, and the pusher boss 23 is divided into upper and lower portions 231 and 232.
  • the upper and lower portions of the pusher boss 23 are integrally formed, and the upper portion 231 of the pusher boss is conical, and the pusher boss is The diameter of the lower surface of the upper portion 231 is larger than the diameter of the upper surface of the lower portion 232 of the pusher boss, and the flange 24 is formed at the junction of the upper portion 231 of the pusher boss and the lower portion 232 of the pusher boss.
  • the lower portion of the outer peripheral surface of the screw 4 is provided with a rib 41, a detachment rib 42 and a spring snap 43 in order from the top to the bottom, and the joint between the outer peripheral surface of the screw 4 and the spring snap 43 is formed.
  • An inverted V-shaped groove 44, the spring catch 43 is contracted in the radial direction of the screw 4, and the inside of the screw 4 is provided with a pusher claw 45.
  • the screw 4 and the outer sleeve 1 are of a split design; the screw 4 is inserted into the outer sleeve 1 from the upper end opening of the outer sleeve 1, and the inner peripheral surface of the outer sleeve 1 is provided with a limiting rib which cooperates with the limiting rib 41.
  • the inner circumferential surface of the outer casing 1 is provided with a retaining rib mounting groove matched with the retaining rib 42.
  • the inner circumferential surface of the outer casing 1 is provided with a spring snap mounting groove matched with the spring snap 43 and a limiting rib. 41.
  • the anti-releaping rib 42 and the spring buckle 43 are snap-fitted in the limit rib mounting groove, the detachment rib mounting groove and the spring snap mounting groove, and the spring buckle 43 and the spring snap mounting groove are interspersed Matching connection
  • the seal of the screw 4 and the outer sleeve 1 is tightly sealed by the spring snap 43; the connection of the spring snap 43 to the outer peripheral surface of the screw shaft forms an inverted V-shaped groove 44, so that the spring snap 43 can be contracted in the radial direction.
  • the spring snap 43 is interference-fitted with the spring snap mounting groove of the outer sleeve 1.
  • the spring snap 43 is contracted and caught in the corresponding spring snap mounting groove of the outer sleeve 1 to seal Function, and does not leak at 300 kPa positive pressure, negative pressure 80 kPa does not leak.
  • the screw 4 is also designed with a retaining rib 42, and the retaining rib 42 has a semi-circular convex structure, and the inner circumferential surface of the outer casing 1
  • the anti-stripping installation groove has a semi-circular recess structure, and the anti-releaping rib 42 cooperates with the defensive rib mounting groove to cooperate with a convex and a concave structure to fix the screw 4 in the outer casing 1 to prevent the screw port 4 from being under a negative pressure of 80 kPa. In the case of the jacket 1 is taken out.
  • the rib 4 is also designed on the screw 4, and cooperates with the limiting rib mounting groove of the outer 1 to serve as the screw 4 limiting position, preventing the screw 4 from being overstressed when the internal pressure is too large or the push rod 2 is pushed. 1 out.
  • the pusher boss 23 is inserted into the screw opening 4 from the lower end opening of the screw 4, and the pusher boss 23 is engaged in the pusher claw 45, and the upper portion 231 of the pusher boss 23 is located on the push rod. Above the claw 45, the lower portion 231 of the pusher boss 23 is located inside the pusher pawl 45, and the tip end of the pusher pawl 45 is not in contact with the flange 24.
  • the rubber plug 3 has a rectangular cross section, and the upper surface 31 of the rubber plug 3 has a downwardly concave curved surface structure, and the lower surface 32 of the rubber plug 3 has an upwardly concave curved surface structure, and the rubber plug 3
  • the inner surface 33 has an outwardly concave curved surface structure
  • the outer surface 34 of the rubber stopper 3 has an arcuate structure which is recessed inward.
  • the rubber plug 3 is designed to be a rubber plug 3 based on a small interference amount. It plays a sealing role and truly realizes a low-resistance syringe. When the pressure difference between the upper and lower surfaces 31 and 32 of the rubber stopper 3, the structure can ensure that the rubber stopper 3 is pressed more tightly under the action of pressure, and the tighter sealing is achieved.
  • the pusher claw 45 is composed of four spring pieces, and the four spring pieces enclose an inner hollow structure, forming a structure that can only enter and exit, and is used to cooperate with the pusher boss 23, and when the pusher 2 is pushed,
  • the push rod boss 23 is inserted into the push rod claw 45, and the push rod claw 45 is first bounced to be clamped, and the push rod boss is pushed together.
  • the rods are locked together so that the push rod 2 and the screw 4 are integrated.
  • the screw 4 is pulled back together. If the injection needle is provided, the injection needle is also mounted on the screw 4 and pulled back together. The syringe product is rendered useless for safety purposes.
  • the push rod 2 pulls down the last position the push 2 is broken from the broken notch 22 to serve as a secondary protection.
  • the safety syringe of the invention has the advantages of simple structure and convenient operation, and the outer sleeve and the screw are designed separately, and the destructive effect on the used syringe is obvious, and the syringe can be prevented from being repeatedly used.
  • the push rod when the push rod is retracted, When the screw is pulled back together, the product loses its function and plays a safety role. At the same time, when the push rod is retracted to the final position, the push rod is broken from the broken gap, which can play the role of secondary protection.

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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

一种安全注射器，包括外套（1）、推杆（2）、胶塞（3）和螺口（4），所述外套（1）垂直设置，所述推杆（2）从所述外套（1）的下端开口插入在所述外套（1）内，所述胶塞（3）套设在所述推杆（2）上并位于所述外套（1）内，所述推杆（2）的外周面的上部从上至下依次设置一胶塞安装口（21）和一折断缺口（22），所述推杆（2）的顶端设置一推杆凸台（23）；所述螺口（4）从所述外套（1）的上端开口插入在所述外套（1）内；所述推杆凸台（23）从所述螺口（4）的下端开口插入所述螺口（4）内。所述安全注射器结构简单，操作方便，对使用过的注射器毁型，可防止注射器被重复使用。

Description

一种安全注射器 技术领域
本发明涉及一种安全注射器，属于医疗器械技术领域。
背景技术
为避免交叉感染，注射器一般都是一次性注射器，只使用一次，但是现有的注射器的外套与螺口一般为一体式设计，这样的设计在使用后具有可逆性，即使用过的注射器，在螺口上再次套上注射针后，即可以被重复使用，损害消费者健康。
发明内容
本发明的目的是克服现有技术的缺陷，提供一种安全注射器，结构简单，操作方便，外套与螺口分体式设计，对使用过的注射器的毁型作用明显，可防止注射器被重复使用。
实现上述目的的技术方案是：一种安全注射器，包括外套、推杆、胶塞和螺口，所述外套垂直设置，所述推杆从所述外套的下端开口插入在所述外套内，所述胶塞套设在所述推杆上并位于所述外套内，其中：
所述推杆的外周面的上部从上至下依次设置一胶塞安装口和一折断缺口，所述胶塞套设在所述胶塞安装口上；
所述推杆的顶端设置一推杆凸台，所述推杆凸台分为上、下部，所述推杆凸台的上、下部一体成型，所述推杆凸台的上部呈圆锥形，所述推杆凸台的上部的下表面的直径大于所述推杆凸台的下部的上表面的直径，所述推杆凸台的上部与所述推杆凸台的下部的连接处形成凸缘；
所述螺口的外周面的下部从上至下依次设置有限位筋、止脱筋和弹簧卡扣，所述螺口的外周面与所述弹簧卡扣的连接处形成一倒V形槽，所述弹簧卡扣沿所述螺口的径向收缩，所述螺口的内部设置有推杆卡爪；
所述螺口从所述外套的上端开口插入在所述外套内，所述外套的内周面设置有与所述限位筋相配合的限位筋安装槽，所述外套的内周面设置有与所述止脱筋相配合的止脱筋安装槽，所述外套的内周面设置有与所述弹簧卡扣相配合的弹簧卡扣安装槽，所述限位筋、止脱筋和弹簧卡扣一一对应地卡接在所述限位筋安装槽、止脱筋安装槽和弹簧卡扣安装槽内；
所述推杆凸台从所述螺口的下端开口插入所述螺口内，且所述推杆凸台卡接在所述推杆卡爪内，所述推杆凸台的上部位于所述推杆卡爪的上方，所述推杆凸台的下部位于所述推杆卡爪的内部，所述推杆卡爪的顶端与所述凸缘非接触设置。
上述的一种安全注射器，其中，所述胶塞的横截面呈矩形，且所述胶塞的上表面呈向下凹陷的弧面结构，所述胶塞的下表面呈向上凹陷的弧面结构，所述胶塞的内表面呈向外凹陷的弧面结构，所述胶塞的外表面呈向内凹陷的弧面结构。
上述的一种安全注射器，其中，所述推杆卡爪由四个弹簧片组成，所述四个弹簧片围成内部中空的结构。
上述的一种安全注射器，其中，所述弹簧卡扣与所述弹簧卡扣安装槽过盈配合连接。
上述的一种安全注射器，其中，所述止脱筋呈半圆形凸起结构，所述止脱筋安装槽呈半圆形凹陷结构。
本发明的安全注射器，与现有技术相比的有益效果是：结构简单，操作方便，外套与螺口分体式设计，对使用过的注射器的毁型作用明显，可防止注射器被重复使用，对使用过的注射器，推杆回退时连同螺口一并拉回，产品失去作用，起到安全的目的，同时，推杆回退到最后的位置的时候推杆从折断缺口折断，可以起到二次保护的作用。
附图说明
图1为本发明的安全注射器的结构图；
图2为图1的A-A向剖视图；
图3为图2的B部分的放大图；
图4为本发明的安全注射器的推杆的结构图；
图5为本发明的安全注射器的螺口与外套的连接示意图；
图6为本发明的安全注射器的胶塞的横截面图。
具体实施方式
为了使本技术领域的技术人员能更好地理解本发明的技术方案，下面结合附图对其具体实施方式进行详细地说明：
请参阅图1至图6，本发明的最佳实施例.一种安全注射器，包括外套1、推杆2、胶塞3和螺口4，外套1垂直设置，推杆2从外套1的下端开口插入在外套1内，胶塞3套设在推杆2上并位于外套1内，螺口4从外套1的上端开口插入在外套1内。
再请参阅图4，推杆2的外周面的上部从上至下依次设置一胶塞安装口21和一折断缺口22，胶塞3套设在胶塞安装口21上；推杆2的顶端设置一推杆凸台23，推杆凸台23分为上、下部231、232，推杆凸台23的上、下部一体成型，推杆凸台的上部231呈圆锥形，推杆凸台的上部231的下表面的直径大于推杆凸台的下部232的上表面的直径，推杆凸台的上部231与推杆凸台的下部232的连接处形成凸缘24。
再请参阅图5，螺口4的外周面的下部从上至下依次设置有限位筋41、止脱筋42和弹簧卡扣43，螺口4的外周面与弹簧卡扣43的连接处形成一倒V形槽44，弹簧卡扣43沿螺口4的径向收缩，螺口4的内部设置有推杆卡爪45。
再请参阅图5，螺口4与外套1分体式设计；螺口4从外套1的上端开口插入在外套1内，外套1的内周面设置有与限位筋41相配合的限位筋安装槽，外套1的内周面设置有与止脱筋42相配合的止脱筋安装槽，外套1的内周面设置有与弹簧卡扣43相配合的弹簧卡扣安装槽，限位筋41、止脱筋42和弹簧卡扣43一一对应地卡接在限位筋安装槽、止脱筋安装槽和弹簧卡扣安装槽内，且弹簧卡扣43与弹簧卡扣安装槽过盈配合连接；
螺口4与外套1的密封依靠弹簧卡扣43张紧密封；弹簧卡扣43与螺口的外周面的连接处形成倒V形槽44，使弹簧卡扣43能够在径向实现收缩。在螺口4与外套1装配后弹簧卡扣43与外套1的弹簧卡扣安装槽过盈配合，受到外力后弹簧卡扣43收缩卡在外套1相应的弹簧卡扣安装槽内，起到密封作用，且在300kPa正压不泄露，负压80kPa不泄露。
螺口4上还设计有止脱筋42，止脱筋42呈半圆形凸起结构，外套1内周面的 止脱筋安装槽呈半圆形凹陷结构，止脱筋42与止脱筋安装槽装配后一凸和一凹结构相配合使螺口4固定在外套1中，防止螺口4在负压80kPa的情况下从外套1脱出。
螺口4上还设计有限位筋41，与外1的限位筋安装槽配合起到螺口4限位的作用，防止螺口4在内部压力过大或者推杆2推注的时候从外套1脱出。
再参阅图3，推杆凸台23从螺口4的下端开口插入螺口4内，且推杆凸台23卡接在推杆卡爪45内，推杆凸台23的上部231位于推杆卡爪45的上方，推杆凸台23的下部231位于推杆卡爪45的内部，推杆卡爪45的顶端与凸缘24非接触设置。
再请参阅图6，胶塞3的横截面呈矩形，且胶塞3的上表面31呈向下凹陷的弧面结构，胶塞3的下表面32呈向上凹陷的弧面结构，胶塞3的内表面33呈向外凹陷的弧面结构，胶塞3的外表面34呈向内凹陷的弧面结构，此种胶塞3设计可以是胶塞3在很小的过盈量的基础上起到密封作用，真正实现低阻力注射器，当胶塞3上、下表面31、32有压力差时，此种结构可以保证胶塞3在压力作用下越压越紧，实现越紧约密封。
推杆卡爪45由四个弹簧片组成，四个弹簧片围成内部中空的结构，形成了只能进不能出的结构，用来与推杆凸台23配合，推杆2推注时，推杆2从外套1的下端开口插入到外套1的顶端时，推杆凸台23插入到推杆卡爪45中，推杆卡爪45先弹开在卡紧，把推杆凸台连带推杆一并锁紧，使推杆2与螺口4变成一体。推杆2回退时，连同螺口4一并拉回，如果配有注射针，注射针装在螺口4上也一并拉回。使注射器产品失去作用，起到安全的目的。推杆2拉倒最后的位置的时候，推,2从折断缺口22折断，起到二次保护的作用。
本发明的安全注射器，结构简单，操作方便，外套与螺口分体式设计，对使用过的注射器的毁型作用明显，可防止注射器被重复使用，对使用过的注射器，推杆回退时连同螺口一并拉回，产品失去作用，起到安全的目的，同时，推杆回退到最后的位置的时候推杆从折断缺口折断，可以起到二次保护的作用。
本技术领域中的普通技术人员应当认识到，以上的实施例仅是用来说明本发明，而并非用作为对本发明的限定，只要在本发明的实质精神范围内，对以上所述实施例的变化、变型都将落在本发明的权利要求书范围内。

Claims (5)

  1. 一种安全注射器，包括外套、推杆、胶塞和螺口，所述外套垂直设置，所述推杆从所述外套的下端开口插入在所述外套内，所述胶塞套设在所述推杆上并位于所述外套内，其特征在于，
    所述推杆的外周面的上部从上至下依次设置一胶塞安装口和一折断缺口，所述胶塞套设在所述胶塞安装口上；
    所述推杆的顶端设置一推杆凸台，所述推杆凸台分为上、下部，所述推杆凸台的上、下部一体成型，所述推杆凸台的上部呈圆锥形，所述推杆凸台的上部的下表面的直径大于所述推杆凸台的下部的上表面的直径，所述推杆凸台的上部与所述推杆凸台的下部的连接处形成凸缘；
    所述螺口的外周面的下部从上至下依次设置有限位筋、止脱筋和弹簧卡扣，所述螺口的外周面与所述弹簧卡扣的连接处形成一倒V形槽，所述弹簧卡扣沿所述螺口的径向收缩，所述螺口的内部设置有推杆卡爪；
    所述螺口从所述外套的上端开口插入在所述外套内，所述外套的内周面设置有与所述限位筋相配合的限位筋安装槽，所述外套的内周面设置有与所述止脱筋相配合的止脱筋安装槽，所述外套的内周面设置有与所述弹簧卡扣相配合的弹簧卡扣安装槽，所述限位筋、止脱筋和弹簧卡扣一一对应地卡接在所述限位筋安装槽、止脱筋安装槽和弹簧卡扣安装槽内；
    所述推杆凸台从所述螺口的下端开口插入所述螺口内，且所述推杆凸台卡接在所述推杆卡爪内，所述推杆凸台的上部位于所述推杆卡爪的上方，所述推杆凸台的下部位于所述推杆卡爪的内部，所述推杆卡爪的顶端与所述凸缘非接触设置。
  2. 根据权利要求1所述的一种安全注射器，其特征在于，所述胶塞的横截面呈矩形，且所述胶塞的上表面呈向下凹陷的弧面结构，所述胶塞的下表面呈向上凹陷的弧面结构，所述胶塞的内表面呈向外凹陷的弧面结构，所述胶塞的外表面呈向内凹陷的弧面结构。
  3. 根据权利要求1所述的一种安全注射器，其特征在于，所述推杆卡爪由四个弹簧片组成，所述四个弹簧片围成内部中空的结构。
  4. 根据权利要求1所述的一种安全注射器，其特征在于，所述弹簧卡扣与所述弹簧卡扣安装槽过盈配合连接。
  5. 根据权利要求1所述的一种安全注射器，其特征在于，所述止脱筋呈半圆形凸起结构，所述止脱筋安装槽呈半圆形凹陷结构。
PCT/CN2015/086704 2015-04-21 2015-08-12 一种安全注射器 WO2016169156A1 (zh)

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