WO2009100644A1 - 自动回缩安全注射器 - Google Patents

自动回缩安全注射器 Download PDF

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Publication number
WO2009100644A1
WO2009100644A1 PCT/CN2009/000106 CN2009000106W WO2009100644A1 WO 2009100644 A1 WO2009100644 A1 WO 2009100644A1 CN 2009000106 W CN2009000106 W CN 2009000106W WO 2009100644 A1 WO2009100644 A1 WO 2009100644A1
Authority
WO
WIPO (PCT)
Prior art keywords
needle
ring
needle tube
tube seat
elastic damping
Prior art date
Application number
PCT/CN2009/000106
Other languages
English (en)
French (fr)
Inventor
Dongsen Fang
Original Assignee
Dongsen Fang
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 Dongsen Fang filed Critical Dongsen Fang
Publication of WO2009100644A1 publication Critical patent/WO2009100644A1/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    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston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
    • A61M5/3234—Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user
    • A61M2005/3235—Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user triggered by radial deflection of the anchoring parts between needle mount and syringe barrel or needle housing, e.g. spreading of needle mount retaining hooks having slanted surfaces by engagement with correspondingly shaped surfaces on the piston at the end of an injection stroke
    • 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
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31501—Means for blocking or restricting the movement of the rod or piston
    • A61M5/31505—Integral with the syringe barrel, i.e. connected to the barrel so as to make up a single complete piece or unit
    • 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
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/50—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
    • A61M5/5013—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe
    • A61M5/502—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe for blocking the piston

Definitions

  • the present invention relates to a medical device, and more particularly to an automatic retracting safety syringe.
  • a syringe is a commonly used medical device. It generally includes a jacket, a piston, a core rod, and a needle.
  • the disposable syringes currently used belong to the management concept, and the performance is not "one-off". It can be used repeatedly and repeatedly, leaving hidden dangers for cross-infection and easily causing disease transmission. In addition, during the subsequent treatment, most of the needles are exposed, which can easily scratch the doctors and cause new cross infection.
  • a safe self-destructing single-use sterile syringe which has a spring on the outer wall of the needle seat, and the core rod is a hollow tube, and a piston, a core rod bottom plug and a needle needle are mounted on the top end of the core rod.
  • the tail of the seat is matched. After the injection of the injection liquid is completed, the core plug and the needle are automatically retracted into the core rod by the spring force.
  • the invention patent is precisely matched because the needle seat is mounted on the needle gasket on the inner wall of the outer casing, and it is difficult to ensure the quality of the product and the original design requirements.
  • Cigarette 200520016075. 5 provides a safety syringe with a needle retractable, which comprises an injection syringe, a barrel push rod, a needle seat, an injection needle, an O-ring, a compression spring plug, a compression spring, and a sealant ring.
  • the injection needle tube is fixed in the needle seat, and the front end of the injection syringe is provided with a fixing device for fixing the needle seat and the compression spring plug, and the needle seat and the injection are arranged between the needle seat and the compression spring plug
  • the needle tube is pushed into the compression spring inside the barrel push rod; the barrel push rod is inserted into the injection syringe, and the sealing rubber ring is set on one side of the barrel push rod, and the inner side is fixed under the reverse thrust of the needle seat.
  • the push end includes a cover and an end connected with the barrel push rod, the end and the barrel push rod One end is tightly fitted, and a circular plate is arranged at the end, and a through hole is arranged on the circular plate, and the cover is connected with a foldable structure at the connection with the circular plate.
  • the disadvantage of the syringe is that the residual liquid has a large residual amount.
  • the front end of the injection syringe is inherently provided with a needle seat sleeve, and a compression spring plug is fixedly disposed at the front end of the needle seat sleeve, and the compression spring plug and the needle are a compression spring is disposed between the seat, and the needle seat and the needle seat sleeve are sealed by a sealing ring;
  • the needle seat cover is a hollow cylinder, and at least one end fixed to the injection syringe is at least There is provided a barb for abutting the needle seat and having an external force to open outwardly.
  • the invention patent structure is complicated in design, high in cost, and difficult to implement.
  • the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art described above, and to provide an automatic retracting safety syringe which is reasonable in structure, convenient in use, stable in performance, reliable in performance, good in safety performance, and self-destructing after one injection.
  • an automatic retracting safety syringe comprising a jacket, a piston, a core rod, a needle assembly, a protective cap, a hollow structure, and a core locking ring at the rear, front
  • the needle portion is arranged in the needle seat, and the needle assembly is movably mounted in the needle seat.
  • the piston is fixedly mounted on the front part of the core rod and can move in the inner cavity of the outer sleeve.
  • the needle assembly comprises a needle tube, a needle tube seat, a needle holder ring and a sealing ring.
  • the spring, the needle tube is fixedly fixed in the through hole of the needle tube seat, the needle tube seat is movably mounted in the front needle seat of the outer sleeve through the needle tube retaining ring, the rear part of the middle protrusion is provided with a clamping cylinder, the front part is set spring; the spring Compressed and mounted in the front through hole of the needle holder, the two ends are respectively supported on the support table at the front end of the needle holder and the upper end surface of the needle holder boss; the needle holder ring is tightly fitted and fixed in the collar of the needle holder a sealing ring that fits the needle tube seat and the needle tube retaining ring at the front of the cartridge cavity, and the needle tube retaining ring is provided with an elastic damping claw that is inclined inward, and the elastic The bearing surface of the damping claw abuts against the lower convex cone surface on the boss of the needle tube seat; the core rod is a hollow tubular structure, the front part of which passes through the piston, and the protruding portion
  • the rear part of the outer casing of the invention is a core rod locking ring cavity, and a core rod locking ring is fitted therein, and a tapered anti-retracting boss is arranged on the circumference of the front outer wall, and the inner wall of the outer sleeve is correspondingly provided with a matching The retreat boss.
  • the core locking ring is a two-part or split semi-circular ring body, and the outer ring shape is identical to the outer core locking ring cavity, and two or more inward sides are disposed thereon.
  • the elastic damping claw is inclined, the front part of the elastic damping claw is provided with a bearing surface, and the end of the elastic damping claw is integrally connected with the wall body of the core locking ring, and the core of the core locking ring is provided with a response corresponding to the elastic damping claw
  • the cavity has a locking boss on the core rod, and the bearing surface of the elastic damping claw cooperates with the core rod locking boss.
  • the engaging cylinder of the needle tube seat is embedded in the clogging engagement cavity, and the front end cylinder of the core rod supports the elastic damping claw on the needle tube seat ring to the recovery cavity, and the elastic damping claw pair
  • the fixing action of the needle tube seat is released.
  • the needle tube seat is automatically pushed into the needle cavity of the core rod together with the needle tube and the blockage; the core rod is installed in the core lock ring cavity at the rear of the outer casing.
  • the locking ring, the elastic damping claw of the core locking ring prevents the core rod from being pulled back by the bearing surface against the locking boss of the core rod, and the core rod cooperates with the core rod locking ring, and the core rod can no longer advance and retreat Self-destruction can be achieved after one injection, realizing one-time use.
  • the invention has reasonable structure, convenient use, stability, good safety performance, self-destruction after one injection, and self-destruction function is reliable.
  • Figure 1 is a schematic view of the structure of the present invention
  • Figure 2 is a partial enlarged view of Figure 1;
  • Figure 3 is a schematic view of the outer structure of the present invention.
  • Figure 4 is a schematic view showing the structure of the core rod of the present invention.
  • Figure 5 is a schematic view showing the structure of the core rod locking ring of the present invention.
  • Figure 6 is a schematic view showing the expansion of the core rod locking ring of the present invention.
  • Figure 8 is a schematic view showing the structure of the needle tube retaining ring of the present invention.
  • Figure 9 is a schematic view showing the plugging structure of the present invention.
  • Figure 10 is a perspective view showing the blockage of the present invention.
  • Figure 11 is a schematic view showing the structure of the plug cover of the present invention.
  • Figure 12 is a schematic view showing the structure of the injection of the present invention.
  • Figure 13 is a schematic view showing the structure of the scrapped state of the present invention.
  • an automatic retracting safety syringe of the present invention comprises a casing 2, a piston 8, a core rod 9, a needle assembly, and a protective cap 1.
  • the outer casing 2 has a hollow structure, and the rear portion is mounted with
  • the core locking ring 12 is provided with a needle seat 11, a needle seat 11 and a casing 2 body structure at the front portion, and the needle assembly is movably mounted in the needle seat 11.
  • the piston 8 is a good elastic body which is fixed to the core rod 9
  • the piston is mounted on the fixing zone 9-5, and is entirely located in the inner cavity 2-3 of the outer casing 2, and the pusher core pulls the injection and injection of the injection liquid. It can also be seen from FIG. 1 and FIG.
  • the needle assembly of the present invention comprises a needle tube 5, a needle tube holder 6, a needle holder retaining ring 7, a sealing ring 3, and a spring 4, and the needle tube 5 is adhesively fixed to the needle tube of the needle tube holder 6.
  • the needle tube seat 6 is movably mounted in the front needle seat of the outer sleeve through the needle tube retaining ring 7, the middle of the middle boss 6-2 is provided with a locking cylinder 6-1, the front set spring 4; the spring 4 is compressed and installed In the front through hole of the needle seat, the two ends are respectively supported on the support table 2-6 at the front end of the needle holder and the upper end surface of the needle holder boss 6-2; the needle holder snap ring 7 is tightly fitted to the card fixed to the needle holder In the annular cavity 2-3, the front ring of the snap ring cavity 2 - 3 is fitted with a sealing ring 3 matched with the needle tube seat and the needle tube retaining ring, and the needle tube retaining ring 7 is provided with an
  • the bearing surface 7-4 of the elastic damping claw 7-2 abuts against the lower convex cone surface on the boss 6-2 of the needle tube seat;
  • the core rod 9 is a hollow tubular structure, the front portion of which passes through the piston, The protruding portion cooperates with the elastic damping claw of the needle hub retaining ring, and the front end of the cavity of the core rod 9 is provided with a plug 10, and the plug 10 is provided with the engaging cylinder of the needle tube seat.
  • Conformable engagement cavity 10-3 Conformable engagement cavity 10-3.
  • the outer casing 2 of the present invention and the front needle seat are integrally formed.
  • the outer casing 2 has a hollow structure, and has a needle seat front end opening 2-8, a needle tube seat through hole 2-5, a needle tube seat ring cavity 2-3, an inner cavity, and a core rod locking ring cavity 2 from the front to the rear. -1 .
  • the front end opening 2-8 of the outer sleeve 2 is provided with a spring support base 2-6 of the central through hole 2-7, and the needle holder seat of the outer sleeve seat is provided with a sealing groove 2-4, a jacket at the front.
  • a retaining boss 2-2 is provided on the circumference of the front inner wall of the core locking ring cavity 2-1 of 2.
  • the core locking ring cavity 2-1 is fitted with a core locking ring 12, and the front outer wall has a tapered anti-retracting boss 12-4 on the circumference thereof, and a corresponding anti-retracting boss on the circumference of the inner wall of the outer casing 2-2 Fitted.
  • the core rod 9 is a tubular structure with a central through hole, the core rod is provided with a piston mounting area 9-5, and the piston 8 is fixed to the core rod. 9 piston installation area 9-5.
  • the outer wall of the core rod 9 is provided with a front end cylinder 9-7 in the direction of the ring axis, a sealing boss 9-6, a support handle 9-4, a locking boss 9-3, a positioning table 9-2, and the like, in the axial direction.
  • the outer bead 9-1, the cavity 9-8, the positioning boss 9-9 are located at the front end of the cavity in the core rod 9, and the plug 10 is fitted with the positioning boss 9-9 of the core rod 9.
  • the clogging 10 is provided with an engaging cavity 10-3 which is matched with the shape of the pin-seat engaging cylinder 6-1 and whose opening faces the engaging cylinder.
  • the plug 10 is a cylinder having an opening at one end, and the opening end of the plug 10 is provided with an engaging cavity 10-3.
  • the outer wall and the bottom of the engaging cavity 10-3 are provided with a draining groove 10-2 penetrating the wall.
  • the rear outer wall of the plug 10 is provided with a positioning boss 10-1, and the positioning on the core rod 9
  • the boss 9-9 is fitted to fix the blockage 10. As shown in Fig. 11, the rear end of the core rod 9 is fitted with the plug cover 11.
  • the front part of the plug cover 11 is provided with a cylinder 11-2, and an annular groove 11-1 is arranged around the cylindrical body 11-2 at the crown of the plug cover, and the annular groove 11-2 is adjacent to the outer bead 9-1 of the core rod 9. Cooperate.
  • the engaging cylinder 6-1 of the needle hub 6 is inserted into the engaging cavity 10-3 of the plug 10, and the front end cylindrical body 9-7 of the core rod 9 causes the elastic damping claw 7 on the needle tube retaining ring 7 to be 2
  • the support is opened in the return chamber 7-3, and the fixing action of the elastic damping claw 7-3 on the needle holder 6 is released.
  • the needle holder 6 is pushed into the core together with the needle 5 and the blockage 10.
  • the needle cavity 9-8 of the rod 9 is inside; the core rod locking ring 2-1 at the rear of the outer casing 2 is fitted with a core locking ring 12 through which the elastic damping claw 12-5 of the core locking ring 12 passes The push surface 12-4 abuts against the locking boss 9-3 of the core rod 9 to prevent the core rod 9 from being pulled back.
  • the needle hub 6 is a central through hole variable cross section cylinder, and the central cylindrical boss 6-2 of the needle holder 6 is provided with a needle tube retaining ring 7.
  • the front end surface of the boss 6-2 of the needle hub 6 is provided with a sealing ring 6-3, the rear end surface of the cylindrical boss 6-2 of the needle tube seat 6 is a convex tapered surface, and the rear portion of the needle tube seat 6 is provided with a engaging cylinder 6-1
  • the engaging cylinder 6-1 can be inserted into the engaging cavity 10-3 of the plug 10. Needle tube seat 6 clearance fit through the front end of the outer sleeve 2, the spring support hole and the needle holder through the ⁇ L
  • the needle holder snap ring 7 of the present invention is a cylindrical body with a central through hole, and the outer shape of the needle tube seat snap ring 7 and the needle tube seat snap ring cavity of the outer sleeve 6 are 4-4, the needle holder
  • the front end of the snap ring 7 is provided with a concave curved surface 7-5, and the back of the needle tube seat snap ring is provided with a concave tapered surface 7-1, and the needle tube seat snap ring is provided with an elastic damping claw 7-2, which is flat, and the elastic damping claw 7-
  • the tail end of the second end is integrally connected with the wall of the needle tube retaining ring 7, the front end of the elastic damping claw 7-2 is inclined inward, and the elastic damping claw 7-2 is provided with a pushing surface 7-4, and the needle holder retaining ring 7
  • the wall body is provided with a recovery chamber 7-3 corresponding to the elastic damping claw 7-2, and the elastic damping claw 7-2 is disassembled to return
  • the needle hub retaining ring 7 is fitted in the needle hub retaining cavity 2-3 of the outer sleeve 2, and the elastic damping jaw 7 of the needle retaining ring 7 is 2 Abuts against the convex tapered surface of the boss 6-2 of the needle hub 6 through the bearing surface 7-4 to fix the needle hub 6.
  • a seal ring 3 is provided between the seal groove 2-4 of the outer sleeve 2 and the seal ring 6-3 of the needle hub 6 and the concave curved surface 7-5 of the needle hub retainer ring 7.
  • the core locking ring 12 is a two-part or split semi-circular ring body, and the outer shape and the outer core of the outer casing lock the ring cavity 2 -1.
  • the core locking ring 12 is provided with two or more elastic damping claws 12-5 which are flat, and the tail end of the elastic damping claw 12-5 of the core locking ring 12 is connected with the wall of the core locking ring 12.
  • the front end of the elastic damping claw 12-5 of the core locking ring 12 is inclined inward, and the elastic damping claw 12-5 of the core locking ring 12 is provided with a pushing surface 12-6, and the wall of the core locking ring 12
  • a return chamber 12-7 is provided on the wall of the core lock ring corresponding to the elastic damping claws 12-5 of the core lock ring 12.
  • the inner wall of the outer casing 2 is correspondingly provided with a retreating boss 2-2.
  • the front end of the inner cavity of the core locking ring 12 is provided with a concave tapered surface 12-3, and the concave tapered surface may be replaced by a concave curved surface.
  • the rear end of the core locking ring 12 is provided with a guiding hole 12-2.
  • the support handle 9-4 on the core rod 9 is located at the front of the core lock ring 12, and the lock projection 9-3 of the core rod 9 is located at the elastic damping claw 12-5 of the core lock ring 12.
  • the face 12-6 is pushed between the concave tapered surface 12-3 of the core locking ring 12.
  • the core rod 9 When the invention is used, the core rod 9 is pushed forward, and the piston 8 is used to push and inject the liquid. After the injection is completed, the engaging cylinder 6-1 of the needle tube seat 6 is inserted into the engaging cavity 10-3 of the plug 10.
  • the front end cylindrical body 9-7 of the core rod 9 supports the elastic damping claw 7-2 on the needle hub retaining ring 7 to the return chamber 7-3, as shown in FIG.

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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

自动回缩安全注射器 技术领域
本发明涉及一种医疗器械， 具体地说是一种自动回缩安全注射器。
背景技术
我们知道， 注射器是一种常用的医疗器具。 其一般包括外套、 活塞、 芯 杆、针头。现在使用的一次性注射器属于管理性概念，使用性能上并不是"一 次性"，可以反复多次使用，给交叉感染留有隐患，容易引起疾病传播。另外， 注射完毕在随后的处理过程中， 由于针头大多暴露在外， 极易剌划伤医患人 员，造成新的交叉感染。发明专利 01116424. 7公开了一种安全自毁一次性使 用无菌注射器， 在针座的外壁安有弹簧，而芯杆是空心管， 在芯杆的顶端安 装活塞， 芯杆底塞与针头针座的尾部相配合。 当注射药液注射完毕后， 芯杆 底塞与针头在弹簧力的作用下次自动缩进芯杆内。 该发明专利由于针座安装 在针头垫圈上于外套内腔壁是精密配合， 很难保证产品的质量和初衷的设计 要求。 另外， 该发明专利所设计的底塞形状在注射完成后会由于其结构的设 计导致部分药液残留在注射器内。 中国专利 200520016075. 5提供了一种针 头能自动回缩的安全注射器其包含有注射针筒、筒式推杆、针座、注射针管、 O型密封圈、 压簧栓塞、 压缩弹簧、 密封胶环、 保护帽及活塞， 注射针管固 定在针座内， 注射针筒的前端设有用于固定针座与压簧栓塞的固定装置， 在 针座与压簧栓塞之间设置有能将针座与注射针管推入筒式推杆内部的压缩弹 簧；筒式推杆插置在注射针筒内，该筒式推杆的一端外侧套装所述密封胶环， 内侧固定有在针座反推力作用下可进入筒式推杆内部的活塞， 另一端延伸出 所述注射针筒， 且安装有一推端， 该推端包括有一堵盖及与筒式推杆连接的 端部， 端部与筒式推杆的一端紧配合， 且在端部设有一圆板， 在该圆板上设 有一通孔， 堵盖在与圆板的连接处为易折结构连接， 这种注射器缺点是残留 液余量多。发明专利 200610101210. 5公开了一种一次性安全注射器，所述注 射针筒的前端封固有一针座套，在所述针座套的前端固定设置有一压簧栓塞， 在该压簧栓塞与针座之间设置有一压簧， 所述针座与针座套之间通过密封圈 密封； 所述针座套为一中空柱体， 在其与所述注射针筒固定的一端往内至少 设有一个用于抵顶所述针座且在外力作用下具有可往外张开的倒钩等。 该发 明专利结构设计复杂、 成本高、 实施难度大。
发明内容
本发明所要解决的技术问题是克服上述现有技术的不足， 提供一种构造 合理， 使用方便、 稳定， 性能可靠， 安全性能好， 一次注射后即自毁的自动 回缩安全注射器。
本发明解决上述技术问题采用的技术方案是：一种自动回缩安全注射器， 其包括外套、 活塞、 芯杆、 针头组件、 护帽， 外套为中空结构， 后部安装有 芯杆锁定环， 前部设有针头座， 针头座内活动安装针头组件， 活塞安装固定 在芯杆前部， 可在外套内腔中移动， 其特征是： 针头组件包括有针管、 针管 座、 针管座卡环、 密封圈、 弹簧， 针管粘接固定在针管座的针管通孔中， 针 管座通过针管座卡环活动安装外套前部针头座内， 其中间凸台后部设有卡合 圆柱， 前部套装弹簧； 弹簧被压缩安装在针头座前部通孔中， 两端分别支撑 在针头座前端开口的支撑台和针管座凸台上端面上； 针管座卡环紧配合安装 固定在针头座的卡环容腔中， 卡环容腔前部安装与针管座及针管座卡环配合 的密封圈， 针管座卡环上设有向内倾斜的弹性阻尼爪， 弹性阻尼爪的承推面 抵靠在针管座的凸台上的下凸锥面上； 芯杆为空腔管状结构， 其前部穿过活 塞， 其突出部分与针管座卡环的弹性阻尼爪相配合， 芯杆空腔的前端活动装 有堵塞， 堵塞上设有与针管座卡合圆柱相配合、 形状相一致的卡合空腔。
本发明外套后部为芯杆锁定环容腔， 其内卡合安装有芯杆锁定环， 其前 部外壁圆周上设有带锥度的止退凸台， 外套内壁圆周上相应地设有一与其配 合的止退凸台。
所述芯杆锁定环为两个连体或分体的半圆型环体组成的通腔环， 其外型 与外套的芯杆锁定环容腔一致，其上设有两个或多个向内侧倾斜弹性阻尼爪， 弹性阻尼爪前部设有承推面，弹性阻尼爪尾端与芯杆锁定环的壁体连成一体， 芯杆锁定环壁体上设有与弹性阻尼爪相对应的回复腔，芯杆上设有锁止凸台， 弹性阻尼爪的承推面与芯杆锁止凸台配合定位。
本发明注射完毕后， 针管座的卡合圆柱嵌入堵塞的卡合腔内， 芯杆的前 端圆柱体使针管座卡环上的弹性阻尼爪向回复腔内支撑张开， 弹性阻尼爪对 针管座的固定作用被解除， 在压缩弹簧的张力作用下， 针管座连同针管、 堵 塞被自动推入芯杆的贮针空腔内； 外套后部的芯杆锁定环容腔内安装有芯杆 锁定环， 芯杆锁定环的弹性阻尼爪通过其承推面抵靠在芯杆的锁止凸台上阻 止芯杆被回拉， 芯杆与芯杆锁定环配合， 芯杆不能再前进和后退， 一次注射 后即可实现自毁， 实现真正的一次性使用，对照现有技术，本发明构造合理， 使用方便、 稳定， 安全性能好， 一次注射后即可实现自毁， 自毁功能可靠。 附图说明
下面结合附图对本发明进一步说明。
图 1是本发明的结构示意图；
图 2是图 1的局部放大图；
图 3是本发明外套结构示意图；
图 4是本发明芯杆结构示意图；
图 5是本发明芯杆锁定环结构示意图；
图 6是本发明芯杆锁定环展开示意图；
图 7中本发明针管座结构示意图；
图 8是本发明针管座卡环结构示意图；
图 9是本发明堵塞结构示意图；
图 10是本发明堵塞立体示意图；
图 11是本发明堵盖结构示意图；
图 12是本发明注射完毕的结构示意图；
图 13是本发明报废状态的结构示意图。
图中的标号是： 1.护帽， 2.外套， 3.密封圈， 4.弹簧， 5.针管， 6.针管座， 7. 针管座卡环， 8.活塞， 9.芯杆， 10.堵塞， 11.针头座， 12.芯杆锁定环。
具体实施方式
从图 1、图 2中可以看出，本发明一种自动回缩安全注射器，其包括外套 2、 活塞 8、 芯杆 9、 针头组件、 护帽 1， 外套 2为中空结构， 后部安装有芯杆锁定 环 12，前部设有针头座 11，针头座 11和外套 2—体结构，针头座 11内活动安装 针头组件， 活塞 8是一种良好的弹性体， 其安装固定在芯杆 9的活塞安装固定 区 9-5上， 整体位于外套 2的内腔 2-3内， 拉推芯杆完成注射液的抽吸、 注射。 从图 1、 图 2中还可以看出， 本发明针头组件包括有针管 5、 针管座 6、 针管座卡环 7、密封圈 3、弹簧 4，针管 5粘接固定在针管座 6的针管通孔中， 针管座 6通过针管座卡环 7活动安装外套前部针头座内， 其中间凸台 6-2后 部设有卡合圆柱 6-1，前部套装弹簧 4;弹簧 4被压缩安装在针头座前部通孔 中， 两端分别支撑在针头座前端开口的支撑台 2-6和针管座凸台 6-2上端面 上；针管座卡环 7紧配合安装固定在针头座的卡环容腔 2-3中，卡环容腔 2 - 3 前部安装与针管座及针管座卡环配合的密封圈 3， 针管座卡环 7上设有向内 倾斜的弹性阻尼爪 7-2， 弹性阻尼爪 7-2的承推面 7-4抵靠在针管座的凸台 6 - 2上的下凸锥面上； 芯杆 9为空腔管状结构， 其前部穿过活塞， 其突出部 分与针管座卡环的弹性阻尼爪相配合， 芯杆 9空腔的前端活动装有堵塞 10， 堵塞 10上设有与针管座卡合圆柱相配合、 形状相一致的卡合空腔 10-3。
从图 3中可以看出， 本发明外套 2和前部的针头座一体结构。 外套 2为 中空结构， 自前部至后部依次设有针头座前端开口 2-8、针管座通孔 2-5、针 管座卡环容腔 2-3、 内腔、 芯杆锁定环容腔 2-1 。 外套 2的前端开口 2- 8内 壁设有中心通孔 2-7的的弹簧支撑台 2- 6，外套针头座的针管座卡环容腔 2 - 3 前部设有密封槽 2-4， 外套 2的芯杆锁定环容腔 2-1前部内壁圆周上设有止 退凸台 2-2。 芯杆锁定环容腔 2-1其内卡合安装有芯杆锁定环 12， 其前部外 壁圆周上为带锥度的止退凸台 12-4， 与外套内壁圆周上相应的止退凸台 2-2 配合固定。
从图 1、 图 2、 图 4、 图 9、 图 10中可以看出， 芯杆 9为中心通孔的管 状结构， 芯杆上设有活塞安装区 9- 5， 活塞 8安装固定在芯杆 9的活塞安装 区 9-5内。芯杆 9的外壁上沿轴线方向依次设有环轴线方向的前端圆柱体 9-7、 密封凸台 9-6、支撑柄 9-4、锁止凸台 9-3、定位台 9-2、外卷边 9-1、空腔 9-8, 定位凸台 9-9位于芯杆 9内空腔的前端， 与芯杆 9的定位凸台 9-9配合安装 堵塞 10。 堵塞 10上设有与针管座卡合圆柱 6-1相配合、 形状相一致的卡合 空腔 10-3， 其开口朝向卡合圆柱。 堵塞 10为一端开口的圆柱体， 堵塞 10的 开口端设有卡合空腔 10-3，沿卡合空腔 10-3轴向外壁和底部设有贯穿壁体的 排液槽 10-2。 堵塞 10的后部外壁上设有定位凸台 10-1， 与芯杆 9上的定位 凸台 9-9配合安装固定堵塞 10。 图 11所示， 芯杆 9后端配合安装堵盖 11。 堵盖 11前部设有圆柱体 11-2，在堵盖冠部绕圆柱体 11-2设有环形凹槽 11-1， 环形凹槽 11-2与芯杆 9外卷边 9-1相配合。
注射终了时， 针管座 6的卡合圆柱 6-1嵌入堵塞 10的卡合空腔 10-3内， 芯杆 9的前端圆柱体 9-7使针管座卡环 7上的弹性阻尼爪 7-2向回复腔 7-3 内支撑张开， 弹性阻尼爪 7-3对针管座 6的固定作用被解除， 在压缩弹簧 4 的张力作用下， 针管座 6连同针管 5、 堵塞 10被推入芯杆 9的贮针空腔 9-8 内； 外套 2后部的芯杆锁定环容腔 2-1内安装有芯杆锁定环 12， 芯杆锁定环 12的弹性阻尼爪 12-5通过其承推面 12-4抵靠在芯杆 9的锁止凸台 9-3上阻 止芯杆 9被回拉。
从图 1、图 2、图 7中可以看出，针管座 6是一个中心通孔变截面圆柱体， 针管座 6中部圆柱凸台 6-2上套装有针管座卡环 7。 针管座 6的凸台 6-2上 前端面设有密封环 6-3， 针管座 6的圆柱凸台 6-2后端面为凸锥面，针管座 6 后部设有卡合圆柱 6-1， 注射终了， 卡合圆柱 6-1可嵌入堵塞 10的卡合空腔 10-3内。 针管座 6间隙配合贯穿外套 2前部的前端开口、 弹簧支撑孔和针管 座通孑 L
从图 8中可以看出， 本发明所述针管座卡环 7为中心通孔的圆柱体， 针管 座卡环 7外型与外套 6的针管座卡环容腔 2- 4—致， 针管座卡环 7前端设有凹弧 面 7- 5，针管座卡环后部设有凹锥面 7-1，针管座卡环设有弹性阻尼爪 7-2， 呈 扁平状， 弹性阻尼爪 7- 2的尾端与针管座卡环 7的壁体连成一体， 弹性阻尼爪 7 - 2的前端向内侧倾斜， 弹性阻尼爪 7- 2上设有承推面 7-4， 针管座卡环 7的壁 体上设有与弹性阻尼爪 7- 2相对应的贯穿壁体的回复腔 7- 3， 弹性阻尼爪 7 - 2 被撑开，可回复至回复腔 7- 3内。针管座卡环 7的承推面 7 - 4前部的内腔设有带 中心孔的收缩挡圈 7-7。
从图 1、 图 2、 图 3、 图 8中可以看出， 针管座卡环 7配合安装在外套 2的针 管座卡环容腔 2- 3内， 针管座卡环 7的弹性阻尼爪 7- 2通过承推面 7- 4抵靠在针 管座 6的凸台 6-2的凸锥面上， 以固定针管座 6。在外套 2的密封槽 2-4和针管座 6的密封环 6-3、 针管座卡环 7的凹弧面 7-5之间设有密封圈 3。 从图 5、 图 6中可以看出， 所述芯杆锁定环 12为两个连体或分体的半圆 型环体组成的通腔环， 其外型与外套的芯杆锁定环容腔 2-1—致。 芯杆锁定 环 12上设有两个或多个弹性阻尼爪 12-5， 呈扁平状， 芯杆锁定环 12的弹性 阻尼爪 12-5的尾端与芯杆锁定环 12的壁体连成一体，芯杆锁定环 12的弹性 阻尼爪 12-5的前端向内侧倾斜，芯杆锁定环 12的弹性阻尼爪 12-5上设有承 推面 12-6，芯杆锁定环 12的壁体上设有与芯杆锁定环 12的弹性阻尼爪 12 - 5 相对应的贯穿芯杆锁定环壁体的回复腔 12-7。 芯杆锁定环 12的两个半圆型 结构合组时相对应的接合面 12-1 上分别设有沿接合面的相互卡合的卡合凸 起 12-8和卡合凹槽 12-9，芯杆锁定环 12前部外壁设有止退凸台 12-4,外套 2内壁圆周上相应地设有一与其配合的止退凸台 2-2。 芯杆锁定环 12的内腔 前端设有凹锥面 12-3， 也可以凹弧面取代此凹锥面， 芯杆锁定环 12后部设 有导向孔 12-2。 注射终了时， 芯杆 9上的支撑柄 9-4位于芯杆锁定环 12的 前部， 芯杆 9的锁止凸台 9-3位于芯杆锁定环 12的弹性阻尼爪 12-5的承推 面 12-6和芯杆锁定环 12的凹锥面 12-3之间。
本发明使用时， 向前推动芯杆 9， 利用活塞 8 良好的弹性， 推动、 注射 液体， 注射完毕后， 针管座 6的卡合圆柱 6-1嵌入堵塞 10的卡合空腔 10-3 内， 芯杆 9的前端圆柱体 9-7使针管座卡环 7上的弹性阻尼爪 7-2向回复腔 7-3内支撑张开， 如图 12所示。弹性阻尼爪 7-2对针管座 6的固定作用被解 除， 在压缩弹簧 4力的作用下， 针管座 6连同针管 5、 堵塞 10被推入芯杆 9 的贮针空腔 9-8内； 注射完毕后， 芯杆 9上的支撑柄 9-4位于芯杆锁定环 12 的前部， 芯杆 9的锁止凸台 9-3位于芯杆锁定环 12的弹性阻尼爪 12-5的承 推面 12-6和芯杆锁定环 12的凹锥面 12-3之间， 芯杆锁定环 12的弹性阻尼 爪 12-5通过其承推面 12-6抵靠在芯杆 9的锁止凸台 9-3上， 阻止芯杆 9被 回拉， 如图 13所示。一次注射后即可实现自毁， 实现真正的一次性使用。本 发明构造合理， 使用方便、 稳定， 安全性能好， 一次注射后即可实现自毁， 自毁功能可靠。

Claims

权 利 要 求 书
1. 一种自动回缩安全注射器， 其包括外套、 活塞、 芯杆、 针头组件、 护帽， 外套为中空结构， 后部安装有芯杆锁定环， 前部设有针头座， 针头座 内活动安装针头组件， 活塞安装固定在芯杆前部， 可在外套内腔中移动， 其 特征是： 针头组件包括有针管、 针管座、 针管座卡环、 密封圈、 弹簧， 针管 粘接固定在针管座的针管通孔中， 针管座通过针管座卡环活动安装外套前部 针头座内， 其中间凸台后部设有卡合圆柱， 前部套装弹簧； 弹簧被压缩安装 在针头座前部通孔中， 两端分别支撑在针头座前端开口的支撑台和针管座凸 台上端面上； 针管座卡环紧配合安装固定在针头座的卡环容腔中， 卡环容腔 前部安装与针管座及针管座卡环配合的密封圈， 针管座卡环上设有向内倾斜 的弹性阻尼爪， 弹性阻尼爪的承推面抵靠在针管座的凸台上的下凸锥面上； 芯杆为空腔管状结构， 其前部穿过活塞， 其突出部分与针管座卡环的弹性阻 尼爪相配合， 芯杆空腔的前端活动装有堵塞， 堵塞上设有与针管座卡合圆柱 相配合、 形状相一致的卡合空腔。
2. 根据权利要求 1所述的自动回缩安全注射器， 其特征是： 外套后部为 芯杆锁定环容腔， 其内卡合安装有芯杆锁定环， 其前部外壁圆周上设有带锥 度的止退凸台， 外套内壁圆周上相应地设有一与其配合的止退凸台。
3. 根据权利要求 1所述的自动回缩安全注射器， 其特征是： 所述芯杆锁 定环为两个连体或分体的半圆型环体组成的通腔环， 其外型与外套的芯杆锁 定环容腔一致， 其上设有两个或多个向内侧倾斜弹性阻尼爪， 弹性阻尼爪前 部设有承推面， 弹性阻尼爪尾端与芯杆锁定环的壁体连成一体， 芯杆锁定环 壁体上设有与弹性阻尼爪相对应的回复腔， 芯杆上设有锁止凸台， 弹性阻尼 爪的承推面与芯杆锁止凸台配合定位。
4. 根据权利要求 1所述的自动回缩安全注射器， 其特征是： 外套的针管 座卡环容腔前部设有密封槽。
5. 根据权利要求 1所述的自动回缩安全注射器， 其特征是： 针管座中部 凸台上端面上设有尖状凸起的密封环， 其与密封圈接触配合， 针管座中部凸 台的后端面为凸锥面， 其与针管座卡环的弹性阻尼爪配合。
6.根据权利要求 1所述的自动回缩安全注射器，其特征是：针管座卡环的 承推面前部的内腔设有带中心孔的收缩挡圈。
7.根据权利要求 4所述的自动回缩安全注射器， 其特征是： 密封圈设置 在外套密封槽和针管座的密封环、 针管座卡环的凹弧面之间。
8.根据权利要求 1所述的自动回缩安全注射器， 其特征是： 堵塞的卡合 空腔， 外壁和底部设有若干条贯穿壁体的排液槽， 堵塞的后部外壁上设有定 位凸台， 其与芯杆上的定位凸台配合安装固定。
9.根据权利要求 1所述的自动回缩安全注射器， 其特征是： 堵盖前部设 有圆柱体， 在堵盖冠部绕圆柱体设有环形凹槽， 环形凹槽与芯杆外卷边相配 合。
10.根据权利要求 3所述的自动回缩安全注射器，其特征是：芯杆锁定环 的两个半圆型环体相对应的接合面上设有相互卡合的卡合凸起和卡合凹槽。
PCT/CN2009/000106 2008-02-04 2009-01-23 自动回缩安全注射器 WO2009100644A1 (zh)

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CN105031771A (zh) * 2015-08-03 2015-11-11 江西洪达医疗器械集团有限公司 锁定胶塞式自毁注射器
CN106390233A (zh) * 2016-08-30 2017-02-15 成都普什医药塑料包装有限公司 一种一次性使用自动弹出式医用针
CN106880889A (zh) * 2017-04-26 2017-06-23 温州市康莱方医用塑料有限公司 一次性安全内瘘针
CN107243108A (zh) * 2017-07-03 2017-10-13 玉环县天来机械设备有限公司 上自毁护套机构
WO2020249349A1 (de) * 2019-06-13 2020-12-17 B. Braun Melsungen Ag Einmalspritze
CN114129822A (zh) * 2021-12-03 2022-03-04 湖南平安医械科技有限公司 一种回拉式注射器

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CN101274114B (zh) * 2008-02-04 2010-06-02 房东森 自动回缩安全注射器
CN101480511B (zh) * 2009-02-08 2011-10-05 浙江康康医疗器械有限公司 一种针头可自动回缩的一次性使用安全注射器
CN201469833U (zh) * 2009-07-30 2010-05-19 林作钱 一种改进的安全注射器
CN102038989B (zh) * 2011-01-25 2012-08-01 广东康尔美医疗器械有限公司 一种安全自毁注射器
CN103239782B (zh) * 2013-05-12 2014-09-03 广东海鸥医疗器械股份有限公司 一种弹簧式安全自毁注射器

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CN105031771A (zh) * 2015-08-03 2015-11-11 江西洪达医疗器械集团有限公司 锁定胶塞式自毁注射器
CN106390233A (zh) * 2016-08-30 2017-02-15 成都普什医药塑料包装有限公司 一种一次性使用自动弹出式医用针
CN106390233B (zh) * 2016-08-30 2023-05-05 成都普什医药塑料包装有限公司 一种一次性使用自动弹出式医用针
CN106880889A (zh) * 2017-04-26 2017-06-23 温州市康莱方医用塑料有限公司 一次性安全内瘘针
CN107243108A (zh) * 2017-07-03 2017-10-13 玉环县天来机械设备有限公司 上自毁护套机构
CN107243108B (zh) * 2017-07-03 2024-02-06 玉环天来科技有限公司 上自毁护套机构
WO2020249349A1 (de) * 2019-06-13 2020-12-17 B. Braun Melsungen Ag Einmalspritze
CN114129822A (zh) * 2021-12-03 2022-03-04 湖南平安医械科技有限公司 一种回拉式注射器

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