WO2012122748A1 - 一种针头能换且能自动回缩的仅能使用一次的安全注射器 - Google Patents

一种针头能换且能自动回缩的仅能使用一次的安全注射器 Download PDF

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Publication number
WO2012122748A1
WO2012122748A1 PCT/CN2011/075441 CN2011075441W WO2012122748A1 WO 2012122748 A1 WO2012122748 A1 WO 2012122748A1 CN 2011075441 W CN2011075441 W CN 2011075441W WO 2012122748 A1 WO2012122748 A1 WO 2012122748A1
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WO
WIPO (PCT)
Prior art keywords
needle
syringe
injection
rod
core rod
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2011/075441
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English (en)
French (fr)
Inventor
蒋文俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 CN2011200737700U external-priority patent/CN202052160U/zh
Priority claimed from CN2011100664973A external-priority patent/CN102188766A/zh
Application filed by Individual filed Critical Individual
Publication of WO2012122748A1 publication Critical patent/WO2012122748A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • A61M5/3234—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
    • A61M5/50—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
    • A61M5/5013—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

  • a safe syringe that can be used only once and can be automatically retracted.
  • the present invention relates to the field of medical device technology, and more particularly to a safety syringe that can be used only once and can be automatically retracted. Background technique
  • the use of disposable sterile syringes in the treatment of disease injection medicinal solutions and sanitary vaccination prevention vaccines has played a positive role in controlling iatrogenic infectious diseases and preventing cross-infection.
  • the prior art single-use sterile syringes include self-destructive, needle-type manual pull-back, needle automatic retraction, and the like, and various forms of single-use sterile syringes, due to imperfections in design and structure. , lack of some necessary functions, can not fully meet the needs of safe use. For example, 1.
  • the prior art single-use sterile syringe because the product is basically kept as it is after use, needs to be returned after the use of the needle protection sleeve, which is very easy to cause accidental injury to the contaminated needle tip by the medical staff;
  • the single-use sterile syringe is called "single-use sterile syringe", but most products are structurally incapable of being used only once, and most of them can be reused, that is, "one-time use” is only It is necessary to strictly comply with the management requirements.
  • the criminals who have been named as "single-use" sterile syringes will be repeatedly used and recycled, which will cause serious consequences of cross-infection. 3.
  • the prior art single-use sterile syringes (such products do not have safety features), especially safety syringes that can automatically retract the needle (such products do not have the characteristics of a needle changeable), generally can not replace the needle 4.
  • the current worldwide hospitals have begun to promote the use of automatic needle retractable safety syringes, including the patent application number of the applicant's previous application: 200910164711.1, "a disposable safety syringe with a needle that can be exchanged and automatically retracted" Etc., the vast majority of these syringes are used in the manner of a compression spring ring that fits over the needle holder.
  • the disadvantage of this method is the tight needle holder.
  • the force F 1 must be greater than the sum of the potential tension F2 of the compression and compression spring and the force F3 of the retraction of the 4th injection needle at the time of injection (ie: F1 > F2+F3), so it is necessary to greatly improve the processing of the product parts.
  • Accuracy requirements, in order to achieve the effect of resisting the retraction of the needle is not affected by the weakening; 2.
  • the needle is fixed in the manner of the needle holder.
  • the disadvantages of this method are three aspects. Firstly, the machining accuracy of the parts in the production process. The requirements are higher. Secondly, the product is affected by the processing precision, the processing and assembly sterilization method and the thermal expansion and contraction of the climatic environment.
  • the object of the present invention is to provide a safety syringe that can be used only once and can be automatically retracted. .
  • the utility model relates to a safety syringe which can be used for changing and can be automatically retracted, and includes a casing and a core rod.
  • One end of the core rod is inserted into the inner cavity of the outer casing from the large end of the outer casing, and further comprises a dispensing needle.
  • the core rod is a cylindrical structure, wherein the inner cavity of the core rod is provided with a snap ring, and a spring rebound rod is arranged in the open hole of the top of the core rod, and the compression spring ring is sleeved On the rebounding rod, one end of the compression spring abuts against the plane of the live rod of the rebounding rod, and the other end abuts against the beam plane of the core rod, and the rebounding rod exposes a portion of the top of the rod of the core rod
  • the elastic buckle device has a card joint at the upper middle portion of the rebound rod, and the joint at the upper middle portion of the rebound rod is assembled above the snap ring provided in the inner cavity of the core rod during assembly, the ring
  • the compression spring that is placed over the rebounding live rod is pressed and the rebounding spring is in the underlying tension of the compression spring being pressed.
  • the injection needle comprises an injection needle tube, an injection needle holder, a needle seat sleeve, a 0-type sealing ring and a needle seat blocking cap.
  • the injection needle seat is a tubular cylinder, and the thick end of the lumen is designed to have a small inlet and a large volume.
  • the outer edge of the thick end of the injection needle seat is designed as a circular arc disk, and the injection needle tube is fixed in a lumen of a thin end of the injection needle seat, and the needle seat cover is a hollow cylinder
  • the lower end of the inner cavity is provided with an arc flange inwardly, and the injection needle seat is placed in the inner cavity of the needle seat sleeve, and the arcuate convex disk of the needle end of the injection needle seat and the arc flange of the needle seat cover
  • a type 0 sealing ring is disposed to achieve a seal
  • the needle seat cap is fixedly disposed at an upper end of the needle seat sleeve, a thin end portion of the needle needle seat passes through the needle seat blocking cap, and a middle thick portion of the needle needle seat abuts the top needle seat
  • the inner surface of the cap, the injection needle holder is fixed, and the dispensing needle includes Medicine needle and dispensing needle holder.
  • a safety syringe that can be used only once and can be automatically retracted as described above, wherein the outer mouth of the outer sleeve is provided with a card basket, and the outer side of the card basket is provided with a bundle section.
  • the inner edge of the large end of the outer sleeve is provided with an undercut means that can be engaged with the bundle so as to securely secure the card basket.
  • a safety syringe that can be used only once and can be automatically retracted as described above, characterized in that the other end of the core rod outside the inner cavity of the outer casing is configured by plugging and snapping.
  • a vent hole is provided at any position from the beam plane of the core rod to the hand.
  • a safety syringe that can be used only once and can be automatically retracted as described above, wherein the outer end of the outer sleeve inserted by the core rod is provided with an inner thread and a tapered hole.
  • the dispensing needle seat is provided with an external thread of a dispensing needle seat and a truncated cone
  • the needle seat sleeve provided with the injection needle seat is provided with an external thread of the needle seat sleeve and a truncated cone
  • the dispensing needle seat or the needle equipped with the injection needle seat When the seat cover and the outer sleeve are respectively matched, the external thread of the dispensing needle seat or the external thread of the needle seat sleeve is respectively screwed with the inner thread of the outer sleeve to make the circular cone of the dispensing needle seat or the circle of the needle seat sleeve with the injection needle seat
  • the frustums are each tightly sealed against the conical bore of the outer casing in
  • a safety syringe that can be used only once and can be automatically retracted as described above, wherein the inner edge of the tapered hole of the outer sleeve is provided with a retracting inner ratchet, and the needle seat sleeve The outer edge is provided with a retracting outer ratchet corresponding to the anti-retracting inner ratchet.
  • a safety syringe that can be used only once and can be automatically retracted as described above, characterized in that the dispensing hub is provided with anti-slip ribs or/and double butterfly wings or/and Surface knurling.
  • a safety syringe which can be used only once and which can be automatically retracted as described above is characterized in that it further comprises an injection needle sheath, and the inside of the needle sheath and the outside of the needle hub sleeve are respectively provided There is a corresponding inner ridge and outer ridge, and the injection needle sheath is fitted over the injection needle.
  • a safety syringe that can be used only once and can be automatically retracted as described above, characterized in that the outer edge of the needle sheath is provided with anti-slip ribs or/and double butterfly wings or / And surface knurling.
  • a safety syringe that can be used only once and can be automatically retracted as described above, wherein the needle holder cap is fixedly disposed on the needle seat cover by snapping, screwing or other suitable means. Upper end.
  • the utility model is characterized in that: the core rod, the injection needle seat, the needle seat cover, the needle seat cover cap, the injection needle sheath ⁇ are made of a plastic material, and the outer casing is made of a medical grade transparent plastic material, and the medicine dispensing needle
  • the dispensing needle and the dispensing needle base are integrally formed with a medical grade non-toxic hard plastic material.
  • the invention compresses and compresses the compression spring on the rebounding live rod in the core rod, and changes the conventional compression spring compression ring on the needle seat, that is, the compression spring is removed and the compression spring is injected.
  • the potential tension on the needle seat increases the force against the retraction of the needle, improves the safety of the product, and has good practical value and economic value.
  • the dispensing needle and the dispensing needle of the dispensing needle are integrally formed with medical grade non-toxic hard plastic, which changes the traditional plastic dispensing needle seat and stainless steel injection needle bonding mode, saving material cost and labor cost, and reducing the overall product. Cost of production.
  • the invention basically does not change the traditional operating habits when used, has convenient use and reliable function, and the injection needle can still be automatically retracted and hidden by the automatic retracting mechanism when the injection is completed, thereby ensuring that the medical staff avoids accidental injury of the contaminated needle tip, thereby avoiding The medical staff suffers from physical pain and mental damage caused by infection of the needle tip, thereby saving a large amount of medical treatment costs caused by infection of the medical staff due to needle tip injury, and because the present invention is provided with a chuck on the outer side of the core rod The large-end fixed card basket is stuck at the end of the injection. After the injection needle is injected, it is automatically retracted and cannot be repeatedly installed and used.
  • the used syringe cannot be repeatedly injected, realizing the meaning of the syringe.
  • Disposable use completely eliminate and avoid cross-infection of blood-borne diseases, especially the compression spring is placed in the core rod. After the syringe is used, the injection needle and the compression spring are quickly separated from the plastic parts. After the syringe is used, Post-processing work is extremely simple, these two aspects show This patent has excellent social benefits.
  • the compression spring ring with the potential tension after pressing is set on the rebounding live rod, which changes the current needle automatic retracting safety syringe on the market, generally uses the compression spring ring on the needle
  • the seat on the seat makes it more safe to resist the retraction of the needle, and this structure has lower requirements for the processing of the product parts, and the requirements for product assembly are more than the practice of placing the compression spring ring on the needle seat. It is simple and convenient. Because the structural design of the invention is more reasonable, it is more suitable for the automatic assembly and production of the production line, which not only improves the output but also ensures the product quality. As the product's pass rate is increased, the increase in output and the reduction in product cost will result in better economic benefits.
  • Figure 1 is a cross-sectional view showing the structure of a dispensing needle with a non-slip rib according to the present invention
  • Figure 2 is a cross-sectional view showing the structure of the present invention after replacing the injection needle
  • Figure 3 is a cross-sectional view showing the structure of the needle in a retracted state after the injection of the drug solution according to the present invention
  • Figure 4 is a cross-sectional view showing the enlarged structure of the integrally formed drug dispensing needle of the present invention
  • Figure 5 is a cross-sectional view showing an enlarged structure of the retractable combined injection needle of the present invention.
  • Figure 6 is a cross-sectional view showing the structure of a needle seat cover of the present invention.
  • Figure 7 is a cross-sectional view showing the structure of an injection needle holder of the present invention.
  • Figure 8 is a cross-sectional view showing the structure of an injection needle sheath of the present invention.
  • Figure 9 is a cross-sectional view showing the structure of the rebounding live lever of the present invention.
  • Figure 10 is a cross-sectional view showing the structure of the outer casing of the present invention.
  • Figure 11 is a cross-sectional view showing the structure of the card basket of the present invention.
  • Figure 12 is a cross-sectional view showing the combined structure of the core rod of the present invention.
  • the present invention provides a safety syringe that can be used only once and which can be automatically retracted.
  • the outer casing 1 and the core rod 2 are included, and one end of the core rod 2 is inserted into the inner cavity of the outer casing 1 from the large end l of the outer casing 1, and further includes a dispensing needle 3 and an injection needle 4.
  • the needle 3 includes a dispensing needle 3a and a dispensing needle holder 3b, and the dispensing needle 3a and the dispensing needle holder 3b of the dispensing needle 3 are integrally molded with a medical grade non-toxic hard plastic material.
  • the core rod 2 is a cylindrical structure, and a inner ring 2a is provided with a snap ring 2al.
  • the open bottom hole of the rod top 2a3 of the core rod 2 is provided with a rebounding live rod 2b, and the compression spring 2d is sleeved in the rebounding work.
  • the compression spring 2d On the rod 2b, one end of the compression spring 2d abuts against the rod plane 2b3 of the rebounding rod 2b, and the other end abuts against the beam plane 2a2 of the core rod 2, the rebounding rod 2b exposing the core rod 2
  • a portion of the rod top 2a3 is provided with an elastic fastening device 2b1, and a middle portion of the rebounding rod 2b is provided with a knob 2b2.
  • the injection needle 4 includes an injection needle tube 4a, an injection needle holder 4b, a needle holder 4c, a 0-type seal ring 4e, and a needle holder cap 4d.
  • the injection needle hub 4b is a tubular cylinder, and the injection needle tube 4a is fixed in the lumen of the thin end 4b1 of the injection needle hub 4b.
  • the needle seat cover 4c is a hollow cylinder, and a lower end of the inner cavity is provided with an arc-shaped flange 4cl, and a 0-type seal ring 4e is clamped at a circular arc flange 4cl at a lower end of the inner cavity of the needle seat cover 4c.
  • the thick end 4b3 of the injection needle hub 4b is placed in the 0-type sealing ring 4e, and the thick end 4b3 is designed as a receiving cavity 4b2 having a small inlet, a large internal volume, and a snap-fit, and a thick end 4b3 of the injection needle hub 4b.
  • a needle retaining cap 4d is fixedly attached to the upper end of the needle seat cover 4c by snapping, screwing or other means, and the narrow end 4bl of the injection needle tube 4a and the injection needle hub 4b partially passes through the needle retaining cap 4d.
  • the middle portion of the needle hub 4b is abutted against the inner surface of the needle holder cap 4d.
  • the inside of the other end of the outer casing 1 inserted by the core rod 2 is provided with an inner casing thread lc, and the dispensing needle 3 and the injection needle 4 are respectively provided with external threads 3b3 and 4c4.
  • the dispensing needle 3 or the injection needle 4 can be conveniently screwed to the outer sleeve 1 by a threaded structure, respectively, depending on the needs of use.
  • the tapered end hole la of the aperture is tapered at the upper end of the outer casing 1
  • the lower end of the dispensing needle base 3b and the needle seat cover 4c are respectively provided with a truncated cone 3bl, 4c2, the dispensing needle 3 or the injection needle 4 respectively and the outer sleeve 1
  • the portions of the truncated cones 3b1 and 4c2 are respectively abutted against the conical holes la to perform sealing.
  • the taper of the tapered bore la should be greater than the taper of the truncated cone 3bl or 4c2, which is advantageous for their fit and sealing.
  • the syringe containing the dispensing needle 3 is used to inject the solvent into the powder bottle to dissolve it. After the syringe is pumped back, the dispensing needle 3 is unscrewed, and the needle 4 is screwed, and the needle sleeve of the needle 4 is injected.
  • the retaining outer ratchet 4c3 disposed on the outer edge of the outer sleeve 4c cooperates with the retaining inner ratchet lb of the outer sleeve 1
  • the injection needle 4 can not be reversely rotated and exited.
  • the core rod 2 pushes the liquid medicine in the outer sleeve 1 to be completed (the front end of the core rod 2 is fitted with the piston).
  • the sealing is prior art, and will not be described in detail herein.
  • the elastic fastening device 2b1 of the rebounding rod 2b in the opening hole of the rod top 2a3 of the core rod 2 abuts into the receiving chamber of the thick end 4b3 of the injection needle holder 4b.
  • the rod top 2a3 of the core rod 2 is gradually exposed, and the exposed end portion of the core rod 2 is inserted into the rough end 4b3 of the injection needle hub 4b and the circular arc flange of the needle seat cover 4c.
  • the arcuate convex disk 4b4 which passes over the outer edge of the thick end 4b3 of the injection needle hub 4b, which is straight to the top 0 type sealing ring 4e, enters the inner cavity of the needle seat cover 4c, at which time the liquid medicine has been injected.
  • the injection needle holder 4b loses the engagement of the 0-type sealing ring 4e, and during the continuous advancement of the core rod 2, the rebounding live rod 2b is also continuously pushed into the inner cavity 2a of the core rod 2 until the rebounding live rod 2b
  • the upper card section 2b2 passes down the snap ring 2al in the inner cavity 2a of the core rod 2, and the rebounding live rod 2b is connected to the injection needle holder 4b (including the injection needle tube) under the action of the compression spring 2d. 4a) thus automatically rebounds into the inner cavity 2a of the core rod 2 together.
  • the designed compression spring 2d should have a sufficient tension to allow the injection needle 4a and the injection needle holder 4b to quickly leave the injection site of the human body and automatically rebound into the inner cavity 2a of the core rod 2 to complete the injection, and no need to return the injection after the end of the injection. Needle seat sheath 5.
  • the core rod 2 is also pushed to the bottom of the outer casing 1 at the same time, at which time the chuck 2c of the core rod 2 also passes over the card basket Id provided at the large end l of the outer casing 1, after the end of the injection The core rod 2 cannot be retracted because the card basket Id is caught by the chuck 2c of the core rod 2.
  • the medical staff avoids accidental injury from the contaminated needle tip, and on the other hand, the design of the present invention makes it difficult to re-use the used syringe. Disassembly and assembly eliminates product reuse, ensuring true one-time use of the safety syringe according to the present invention.
  • the syringe of the present invention further comprises a dispensing needle sheath 3c which is sleeved on the dispensing needle base 3b to protect the dispensing needle 3a; the dispensing needle seat 3b is provided with a plurality of anti-slip ribs 3b2 (or The ridges and/or the double butterfly wings (not shown) and/or the surface knurls (not shown) facilitate gripping and screwing.
  • the syringe of the present invention further includes an injection needle sheath 4f which is looped over the front end of the injection needle 4 to protect the injection needle 4a.
  • a corresponding inner ridge 4fl and an outer ridge 4c5 are respectively disposed at the inner edge of the needle sheath 4f and the outer edge of the hub sleeve 4c.
  • the needle hub sheath 5 is screwed onto the needle seat cover 4c by the inner diameter 5a of the needle hub sheath provided on the inner edge of the needle hub sheath 5, Clean and protect.
  • the present invention further includes a retaining device for the injection needle: a retaining inner ratchet lb is disposed at the inner edge of the tapered bore la of the outer casing 1, and is disposed on the needle hub 4c. The outer edge of the outer edge is provided with a corresponding outer ratchet tooth 4c3.
  • a retaining inner ratchet lb is disposed at the inner edge of the tapered bore la of the outer casing 1, and is disposed on the needle hub 4c.
  • the outer edge of the outer edge is provided with a corresponding outer ratchet tooth 4c3.
  • a card basket Id is disposed in the large end l of the outer casing 1.
  • the outer side of the card basket is provided with a bundle lld, and the inner edge of the large end l of the outer casing 1 is provided with a can.
  • the buckling device lei is engaged with the bundle ldl so as to be able to securely fix the card basket ld.
  • the present invention further includes a vent device, that is, the other end of the core rod 2 outside the inner cavity of the outer casing 1 is provided with a hand 2e by plugging and snapping, A vent hole 2el is provided at any position of the bundle plane 2a2 of the core rod 2 to the handle 2e.
  • the venting device of the present invention prevents the product from balancing the internal and external air pressures of the engaging portion 2b2 of the rebounding live lever 2b when subjected to a vacuum to vacuum sterilization, so that the rebounding movable rod does not move due to the negative pressure.
  • the core rod 2, the injection needle holder 4b, the needle seat cover 4c, the needle holder cap 4d, and the injection needle sheath 4f are made of a plastic material, and the outer casing 1 is made of a medical grade transparent plastic material.

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

Abstract

一种针头能换且能自动回缩的仅能使用一次的安全注射器，包括外套，芯杆，配药针头和注射针头，配药针头用塑料材料成型，能根据使用需要更换成注射针头，不致因溶药使针头产生变形和影响光滑度及锋利度，从而对人体注射产生不良影响。本发明使用时不改变传统的操作习惯，使用便利，作用可靠，注射完成后注射针能通过自动回缩机构回缩隐藏，确保医患人员避免遭受污针尖的意外伤害，芯杆被卡篮卡住无法回抽，致使无法重复使用用过的注射器进行注射，实现注射器真正意义上的一次性使用，避免血源性疾病的交叉传播。由于本发明将压并的压缩弹簧环套上回弹活杆上，结构设计更趋合理，更适合于生产流水线自动组装生产，质量好、合格率高，降低了成本。

Description

一种针头能换且能自动回缩的仅能使用一次的安全注射器 技术领域
本发明涉及医疗器械技术领域，特别是涉及一种针头能换且能自动回缩 的仅能使用一次的安全注射器。 背景技术
目前，在治疗疾病注射药液和卫生防疫接种预防疫苗时使用一次性使用 无菌注射器， 对控制医源性传染病、 防止交叉感染等方面起到了积极作用。 但是，现有技术的一次性使用无菌注射器一一包括自毁式、针头手动回拉式、 针头自动回缩式等多种形式的一次性使用无菌注射器一一由于设计及结构 的不完善， 缺乏一些必需的功能， 不能完全满足安全使用上的需要。 例如， 1. 现有技术的一次性使用无菌注射器， 由于产品用过后基本保持原样，用过 后需回套注射针保护套， 这过程极易产生医护人员遭受污染针尖的意外伤 害； 2.虽说一次性使用无菌注射器定名为 "一次性使用无菌注射器"， 但绝大 多数产品从结构上不能达到仅使用一次的目的， 绝大多数都能重复使用， 也 就是讲 "一次性使用"仅仅是要从管理上去严格要求而已， 唯利是图的不法 分子将定名为 "一次性使用" 无菌注射器重复多次使用和回收使用， 将造 成交叉感染的严重后果； 3.在使用干粉注射剂配制注射药液时， 在向密封的 粉剂药物容器内注进溶液， 容器经摇晃后干粉药物溶解后还需用注射器通过 扎针抽取药液， 这时注射针头已避免不了产生变形及对针头的光滑度和锋利 度产生影响， 从严格意义上来说， 配制药液时用于穿刺药瓶胶塞的注射针是 绝不能再用于对人体进行注射的， 并且， 已有一些国家已经有配制药液穿刺 药瓶胶塞用过的注射针不能再用于对人体进行注射这一方面的强制性要求。 而现有技术的一次性使用无菌注射器 （此类产品不具有安全特征）， 尤其是 针头能自动回缩的安全注射器 （此类产品不具有针头可换的特征）， 一般都 没有能更换针头的功能； 4.当前世界各地医院开始推广使用针头自动回缩型 安全注射器，包括申请者前期申请的发明专利申请号： 200910164711.1 , "— 种针头可换且可自动回缩的一次性安全注射器"等， 绝大多数这种注射器都 是釆用 1. 压并的压缩弹簧环套在针座的方式， 这种方式的弊端是紧卡针座 的力度 F 1必须大于压并压缩弹簧的潜在张力 F2与注射时 4氏御注射针回缩的 力 F3之和（即： F1 > F2+F3 ), 如此势必要较大提高对产品零件加工的精度 要求， 才能达到抵御注射针回缩的力不受减弱的影响； 2. 紧卡针座的方式 固定注射针， 这种方式的弊端有三个方面， 首先在生产过程中对另件的加工 精度要求较高， 其次产品受加工精度、 加工组装灭菌方式和气候环境热胀冷 缩的影响， 其抵御注射针回缩的力也有较大减弱的影响， 最后尤其是用过的 注射器在事后处理时， 其注射针和其它金属器件（压缩弹簧）难以取出和难 以分类作销毁处理。 发明内容
针对以上所述一次性无菌注射器及针头能自动（包括手动）回缩的安全 注射器的不足， 本发明的目的在于， 提出一种针头能换且能自动回缩的仅能 使用一次的安全注射器。
本发明的目的是釆用以下技术解决方案来实现的：
一种针头能换且能自动回缩的仅能使用一次的安全注射器， 包括外套和 芯杆， 所述芯杆的一端从所述外套的大口端插入所述外套的内腔， 还包括配 药针头和注射针头， 所述芯杆为筒式结构， 其特征在于， 所述芯杆的内腔中 设置有卡环， 芯杆的杆顶的开口孔内设置回弹活杆， 压缩弹簧环套在回弹活 杆上， 压缩弹簧的一端抵靠于回弹活杆的活杆平面， 另一端抵靠于芯杆的束 节平面上， 所述回弹活杆露出芯杆的杆顶的部分设有弹性扣合装置， 回弹活 杆的中上部处设有卡节，组装时回弹活杆的中上部处的卡节在芯杆的内腔中 设置的卡环之上被卡固， 环套在回弹活杆上的压缩弹簧被压并， 此时回弹活 杆处于压缩弹簧被压并的潜在张力之中。
所述注射针头包括注射针管、 注射针座、 针座套、 0型密封圈和针座挡 帽， 所述注射针座为管状柱体， 其管腔的粗端设计成入口小、 内容积大、 能 卡接的容纳腔， 所述注射针座的粗端的外缘设计成圓弧凸盘， 所述注射针管 固定在注射针座的细端的管腔内， 所述针座套为中空圓柱体， 其内腔下端向 内设有圓弧凸缘， 所述注射针座置于针座套内腔中， 在所述注射针座的粗端 的圓弧凸盘与针座套的圓弧凸缘之间设置 0型密封圈以实现密封，所述针座 挡帽固定设置在针座套的上端， 注射针座的细端部分穿过针座挡帽， 注射针 座的中粗部分抵顶针座挡帽的内面， 注射针座被固定， 所述配药针头包括配 药针管和配药针座。
如以上所述一种针头能换且能自动回缩的仅能使用一次的安全注射器， 其特征在于， 所述外套的大口端内设置卡篮， 所述卡篮的外侧设有束节， 所 述外套的大口端的内缘设置有能与所述束节配合的倒扣装置，从而使之能牢 固地固定所述卡篮。
如以上所述一种针头能换且能自动回缩的仅能使用一次的安全注射器， 其特征在于， 在所述外套的内腔外部的所述芯杆的另一端利用插接、 卡接设 置按手， 在从所述芯杆的束节平面至所述按手的任意位置上设置通气孔。
如以上所述一种针头能换且能自动回缩的仅能使用一次的安全注射器， 其特征在于， 所述外套被芯杆插入的另一端的内部设有外套内螺紋和圓锥 孔， 所述配药针座设有配药针座外螺紋和圓锥台， 装有注射针座的针座套设 有针座套外螺紋和圓锥台， 所述配药针座或装有注射针座的针座套与所述外 套分别配合时通过配药针座外螺紋或针座套外螺紋分别与外套内螺紋旋紧 使所述配药针座的圓锥台或装有注射针座的针座套的圓锥台分别紧密地抵 顶于所述外套的圓锥孔中呈密封状态。
如以上所述一种针头能换且能自动回缩的仅能使用一次的安全注射器， 其特征在于， 所述外套的圓锥孔的内缘设置有止退内棘齿， 所述针座套的外 缘设置有与所述止退内棘齿相对应的止退外棘齿。
如以上所述一种针头能换且能自动回缩的仅能使用一次的安全注射器， 其特征在于， 所述配药针座的外周上设有防滑棱条或 /和双蝶翼或 /和设成表 面滚花。
如以上所述一种针头能换且能自动回缩的仅能使用一次的安全注射器， 其特征在于， 还包括注射针护套， 所述注射针护套的内部和针座套的外部分 别设有对应的内齿脊和外齿脊， 所述注射针护套套在所述注射针头上。
如以上所述一种针头能换且能自动回缩的仅能使用一次的安全注射器， 其特征在于， 所述注射针护套的外缘还设有防滑棱条或 /和双蝶翼或 /和表面 滚花。
如以上所述一种针头能换且能自动回缩的仅能使用一次的安全注射器， 其特征在于， 所述针座挡帽通过卡接、 旋接或其它适合的方式固定设置在针 座套上端。
如以上所述一种针头能换且能自动回缩的仅能使用一次的安全注射器， 其特征在于， 所述芯杆、 注射针座、 针座套、 针座挡帽、 注射针护套釆用塑 料材料制成， 所述外套釆用医用级透明塑料材料制成， 所述配药针头的配药 针管和配药针座釆用医用级无毒硬质塑料材料一体成型。
本发明的一种针头能换且能自动回缩的仅能使用一次的安全注射器与 现有技术相比较有如下有益效果：
1.本发明将压缩弹簧压并设置在芯杆内的回弹活杆上， 改变了传统的将 压并的压缩弹簧环套在针座上的做法一即去除了压并的压缩弹簧在注射针 座上的潜在张力， 增大了抵御注射针回缩的力， 提高了产品的安全性， 具有 艮好的实用价值和经济价值。 配药针头的配药针管和配药针座釆用医用级无 毒硬质塑料一体成型， 改变了传统的塑料配药针座与不锈钢注射针管粘结方 式， 节约了材料成本和人工费用， 降低了整体产品的生产成本。
2.本发明使用时基本不改变传统的操作习惯， 使用便利， 作用可靠， 注 射完成时注射针仍能通过自动回缩机构自动回缩隐藏，确保医护人员避免遭 受污染针尖的意外伤害，从而避免了医护人员因针尖伤害而感染疾病所受肉 体痛苦和精神伤害，从而节省了大量的因针尖伤害医务人员而感染疾病带来 的医药救治费用， 并且由于本发明在芯杆外侧设置卡盘被外套大口端固定的 卡篮在注射完毕时被卡住， 注射针注射完毕后自动回缩而无法重复安装使 用， 从这两方面的结构设计上让使用过的注射器无法重复进行注射， 实现注 射器真正意义上的一次性使用， 彻底杜绝、 避免血源性疾病的交叉感染， 特 别是将压缩弹簧设置在芯杆内， 注射器使用过后极易使注射针和压缩弹簧与 塑料件迅速分开， 注射器使用过后的后处理工作极其简单， 这二方面显示了 本专利具有极好的社会效益。
3.本发明结构设计的独创性， 将压并后具有潜在张力的压缩弹簧环设在 回弹活杆上， 改变了目前市场上针头自动回缩安全注射器普遍釆用将压缩弹 簧环设在针座上的做法， 使抵御注射针回缩的力增大而更安全， 而且这种结 构对产品零件加工要求相应较低，产品组装的要求也较将压缩弹簧环设在针 座上的做法更简单方便， 由于本发明结构设计更趋合理， 更适合于生产流水 线自动组装生产， 既提高了产量， 又保证了产品质量。 由于产品的合格率提 高， 因此产量提高、 产品成本降低， 即能产生更好的经济效益。
4.综上所述， 由于根据本发明的一种能换针头且能自动回缩的仅能使用 一次的安全注射器具有很好的实用价值、 极好的社会效益和更好的经济效 益， 因此是一种值得在全世界推广应用的、 也极有可能成为时代发展过程中 更新换代的一次性安全注射器。 附图说明
图 1为本发明的带有防滑棱条的配药针头的结构剖视图；
图 2为本发明的更换注射针头之后的结构剖视图；
图 3为本发明完成药液注射后注射针头回缩状态的结构剖视图； 图 4为本发明的一体成型配药针头的放大结构剖视图；
图 5为本发明的可回缩组合注射针头的放大结构剖视图；
图 6为本发明的针座套的结构剖视图；
图 7为本发明的注射针座的结构剖视图；
图 8为本发明的注射针护套的结构剖视图；
图 9为本发明的回弹活杆的结构剖视图；
图 10为本发明的外套的结构剖视图；
图 11为本发明的卡篮的结构剖视图；
图 12为本发明的芯杆的组合结构剖视图。
以上附图中： 1-外套； la-圓锥孔； lb-止退内棘齿； lc-外套内螺紋； ld- 卡篮； ldl-束节; le-大口端; lei-倒扣装置; 2-芯杆； 2a-内腔; 2al-卡环； 2a2-束节平面； 2a3-杆顶； 2b-回弹活杆； 2bl-弹性扣合装置； 2b2-卡节； 2b3- 活杆平面； 2c-卡盘； 2d-压缩弹簧； 2e-按手； 2el-通气孔； 3-配药针头； 3a- 配药针管； 3al-圓锥尖; 3a2-圓锥尖侧孔； 3b-配药针座; 3bl-圓锥台; 3b2- 配药针头防滑棱条； 3b3-配药针座外螺紋； 3c-配药针护套； 4-注射针头； 4a- 注射针管； 4b-注射针座； 4bl-细端； 4b2-容纳腔； 4b3-粗端； 4b4-圓弧凸盘； 4c-针座套； 4cl-圓弧凸缘， 4c2-圓锥台； 4c3-止退外棘齿； 4c4-针座套外螺 紋； 4c5-外齿脊； 4d-针座挡帽； 4e-0型密封圈； 4f-注射针护套； 4fl-内齿 脊； 4G-注射针护套防滑棱条； 5-注射针座护套； 5a-注射针座护套内螺紋。 具体实施方式
本发明提供一种针头能换且能自动回缩的仅能使用一次的安全注射器。 如图 1〜图 12所示， 包括外套 1和芯杆 2, 所述芯杆 2的一端从外套 1的大 口端 le插入所述外套 1的内腔，还包括配药针头 3和注射针头 4。 所述配药 针头 3包括配药针管 3a和配药针座 3b,所述配药针头 3的配药针管 3a和配 药针座 3b釆用医用级无毒硬质塑料材料一体成型。 所述芯杆 2为筒式结构， 其内腔 2a中设置有卡环 2al ,所述芯杆 2的杆顶 2a3的开口孔内设置回弹活 杆 2b, 压缩弹簧 2d环套在回弹活杆 2b上， 压缩弹簧 2d的一端抵靠于回弹 活杆 2b的活杆平面 2b3 , 另一端抵靠于芯杆 2的束节平面 2a2上， 所述回弹 活杆 2b露出芯杆 2的杆顶 2a3的部分设有弹性扣合装置 2bl , 回弹活杆 2b 的中上部设有卡节 2b2,组装时回弹活杆 2b中上部的卡节 2b2在芯杆 2的内 腔 2a中设置的卡环 2al之上被卡固， 环套在回弹活杆 2b上的压缩弹簧 2d 被压并。 所述注射针头 4包括注射针管 4a、 注射针座 4b、 针座套 4c、 0型 密封圈 4e和针座挡帽 4d。 所述注射针座 4b为管状柱体， 所述注射针管 4a 固定在注射针座 4b的细端 4bl的管腔中。 所述针座套 4c为中空圓柱体， 其 内腔下端向内设有圓弧凸缘 4cl , 在所述针座套 4c内腔下端的圓弧凸缘 4cl 处卡固 0型密封圈 4e。所述注射针座 4b的粗端 4b3置于 0型密封圈 4e中， 所述粗端 4b3设计成入口小、 内容积大、 能卡接的容纳腔 4b2, 注射针座 4b 的粗端 4b3外缘上的圓弧凸盘 4b4与针座套 4c内腔下端的圓弧凸缘 4cl之 间相互兜住 0型密封圈 4e, 从而使注射针座 4b与针座套 4c之间密封并卡 固。 在所述针座套 4c的上端通过卡接、 旋接或其他方式固定设置针座挡帽 4d, 所述注射针管 4a及注射针座 4b的细端 4bl部分穿过针座挡帽 4d, 所述 注射针座 4b的中粗部分抵顶针座挡帽 4d的内面。 所述外套 1被芯杆 2插入 的另一端的内部设有外套内螺紋 lc,所述配药针头 3和注射针头 4分别设有 外螺紋 3b3和 4c4。 在实际应用中， 根据使用需要， 能够通过螺紋结构方便 地将所述配药针头 3或注射针头 4分别与外套 1旋接固定。 由于在外套 1的 上端设有孔径渐缩的圓锥孔 la,在配药针座 3b和针座套 4c的下端分别设有 圓锥台 3bl、 4c2 , 配药针头 3或注射针头 4分别与外套 1旋接固定时， 它们 的圓锥台 3bl、 4c2部位分别抵顶于圓锥孔 la内， 从而实施密封。 如果圓锥 孔 la与圓锥台 3bl或 4c2为不同的锥度， 则圓锥孔 la的锥度应大于圓锥台 3bl或 4c2的锥度， 对它们的配合及密封较为有利。如果将圓锥孔 la和圓锥 台 3bl或 4c2设为相同的锥度， 它们之间的接触面大， 密封效果更好。 使用 时， 装有配药针头 3的注射器抽取溶药溶剂注入粉剂瓶中使之溶解， 注射器 回抽药液后旋下配药针头 3 , 旋装上注射针头 4, 此时注射针头 4的针座套 4c外缘上设置的止退外棘齿 4c3与外套 1的止退内棘齿 lb配合发生作用， 致使注射针头 4不能反旋转退出， 当使用旋装有注射针头 4的注射器进行注 射药液时， 芯杆 2将外套 1中的药液推注将要完毕的同时（芯杆 2的前端套 装活塞进行密封是现有技术，在此不作详细说明）， 芯杆 2的杆顶 2a3的开口 孔中的回弹活杆 2b的弹性扣合装置 2bl抵顶进入注射针座 4b的粗端 4b3的 容纳腔 4b2中被卡固， 芯杆 2继续推进时， 回弹活杆 2b被注射针座 4b的反 顶力逐渐顶移进入芯杆 2的空腔 2a内， 回弹活杆 2b逐渐被顶移进入芯杆 2 的内腔 2a内的同时， 芯杆 2的杆顶 2a3逐渐暴露， 随着芯杆 2的推进暴露 部位插进注射针座 4b的粗端 4b3与针座套 4c的圓弧凸缘 4cl之间的间隙内， 直抵顶 0型密封圈 4e翻越过注射针座 4b的粗端 4b3外缘的圓弧凸盘 4b4进 入针座套 4c的内腔， 此时药液已注射完毕。 注射针座 4b失去 0型密封圈 4e的卡固， 同时在芯杆 2继续推进过程中， 回弹活杆 2b也在不断被推移进 入芯杆 2的内腔 2a, 直至回弹活杆 2b中上部的卡节 2b2向下越过芯杆 2的 内腔 2a中的卡环 2al , 回弹活杆 2b在压缩弹簧 2d舒张力的作用下， 回弹活 杆 2b连接注射针座 4b (包括注射针管 4a )从而一起自动向芯杆 2的内腔 2a 内回弹。所设计的压缩弹簧 2d的舒张力应足以使注射针管 4a和注射针座 4b 迅速离开人体注射部位而整体自动回弹落入芯杆 2的内腔 2a内结束注射， 结束注射后无需回套注射针座护套 5。 同时， 在药液注射完毕时， 芯杆 2也 同时推到外套 1的底部， 这时芯杆 2的卡盘 2c也同时越过设置在外套 1的 大口端 le的卡篮 Id,在结束注射后， 芯杆 2因被卡篮 Id卡住芯杆 2的卡盘 2c而无法回抽，一方面医护人员避免了遭受污染针尖的意外伤害， 另一方面 本发明的设计使使用过的注射器难于重新拆装而杜绝产品重复使用，确保根 据本发明的安全注射器真正的一次性使用。
如图 4所示， 本发明注射器还包括配药针护套 3c, 活套在配药针座 3b 上， 对配药针管 3a起保护作用； 配药针座 3b上设有多条防滑棱条 3b2 (或 称凸脊）和 /或设成双蝶翼 (图中未示出）和 /或表面滚花 (图中未示出）， 便于握 持及旋接。
如图 8所示， 本发明注射器还包括注射针护套 4f, 活套在注射针头 4的 前端，对注射针管 4a保护。在注射针护套 4f内缘和针座套 4c外缘分别设有 对应的内齿脊 4fl和外齿脊 4c5 , 如图 5所示， 注射针护套 4f和针座套 4c 相套接时， 它们的内齿脊 4fl 和外齿脊 4c5相互交错设置， 注射针护套 4f 外缘还设有多条防滑棱条 4f2 (或称凸脊）和 /或设成双蝶翼 (图中未示出）和 / 或表面滚花 (图中未示出）， 便于注射针头 4的旋接安装。 在注射针头 4未旋 接安装在外套 1上之前， 利用注射针座护套 5内缘上设置的注射针座护套内 螺紋 5a将注射针座护套 5旋套在针座套 4c上， 加以清洁保护。
如图 5和图 6、 8、 10所示， 本发明还包括注射针头的止退装置： 在外 套 1的圓锥孔 la的内缘设置有止退内棘齿 lb,并在针座套 4c的外缘上设置 有对应的止退外棘齿 4c3 , 当注射针头 4旋入外套 1时， 由于止退内棘齿 lb 和止退外棘齿 4c3的作用， 注射针头 4只能单向旋进， 而反向无法旋出。 本 发明注射针头的止退装置可防止重复使用用过的废弃注射器， 或被拆卸后重 新加以利用。
如图 10和 11所示， 所述外套 1的大口端 le中设置卡篮 Id, 所述卡篮 的外侧设有束节 ldl , 所述外套 1 的大口端 le的内缘设置有能与所述束节 ldl配合的倒扣装置 lei , 从而使之能牢固地固定所述卡篮 ld。
如图 1和图 12所示， 本发明还包括通气孔装置， 即在所述外套 1的内 腔外部的所述芯杆 2的另一端利用插接、 卡接设置按手 2e, 在从所述芯杆 2 的束节平面 2a2至所述按手 2e的任意位置上设置通气孔 2el。本发明的通气 孔装置可防止产品在经受需负压至真空灭菌时， 使回弹活杆 2b的卡节 2b2 的内外气压平衡， 不致回弹活杆因负压而移动。
所述芯杆 2、 注射针座 4b、 针座套 4c、 针座挡帽 4d、 注射针护套 4f釆 用塑料材料制成， 所述外套 1釆用医用级透明塑料材料制成。
上述实施例仅作为说明之例， 并非对本发明所作的限定， 本发明还可以 釆用其他方式、 步骤进行实施， 在此不作一一赘述。 但凡釆用等同替换或等 效变换形成的技术方案， 均属于本发明要求的保护范围。

Claims

权 利 要 求
1、 一种针头能换且能自动回缩的仅能使用一次的安全注射器， 包括外 套（1 )和芯杆（2), 所述芯杆（2) 的一端从所述外套（1 ) 的大口端 （le) 插入所述外套（1 ) 的内腔， 还包括配药针头（3 )和注射针头（4), 所述芯 杆（2)为筒式结构， 其特征在于， 所述芯杆（2) 的内腔（2a) 中设置有卡 环 （2al ), 芯杆（2) 的杆顶 （2a3 ) 的开口孔内设置回弹活杆（2b), 压缩 弹簧（2d)环套在回弹活杆（2b)上， 压缩弹簧（2d)的一端抵靠于回弹活 杆（2b)的活杆平面（2b3), 另一端抵靠于芯杆（2)的束节平面（2a2)上， 所述回弹活杆（2b)露出芯杆（2) 的杆顶 （2a3) 的部分设有弹性扣合装置 (2bl ), 回弹活杆（2b) 的中上部设有卡节 （2b2), 组装时回弹活杆（2b) 中上部的卡节 （2b2)在芯杆 （2) 的内腔（2a) 中设置的卡环 （2al )之上 被卡固， 环套在回弹活杆（2b)上的压缩弹簧（2d)被压并。
2、 根据权利要求 1 所述的一种针头能换且能自动回缩的仅能使用一次 的安全注射器， 其特征在于， 所述注射针头 （4) 包括注射针管 （4a)、 注射 针座（4b)、 针座套（4c)、 0 型密封圈 （4e)和针座挡帽 （4d), 所述注射 针座（4b) 为管状柱体， 其管腔的粗端 （4b3 )设计成入口小、 内容积大、 能卡接的容纳腔（4b2), 所述注射针座（4b) 的粗端 （4b3 ) 的外缘设计成 圓弧凸盘（4b4), 所述注射针管 （4a) 固定在注射针座（4b) 的细端 （4bl ) 的管腔内， 所述针座套（4c)为中空圓柱体， 其内腔下端向内设有圓弧凸缘 ( 4cl ),所述注射针座（ 4b )置于针座套（ 4c )内腔中，在所述注射针座（ 4b ) 的粗端 （4b3 ) 的圓弧凸盘 （4b4) 与针座套（4c) 的圓弧凸缘（ 4cl )之间 设置 0型密封圈（4e)以实现密封， 所述针座挡帽（4d)设置在针座套（4c) 的上端， 注射针座（4b)的细端（4bl )部分穿过针座挡帽（4d), 注射针座 (4b)的中粗部分抵顶针座挡帽（4d) 的内面， 注射针座被固定， 所述配药 针头 （3) 包括配药针管 （3a)和配药针座（3b)。
3、 根据权利要求 2所述的一种针头能换且能自动回缩的仅能使用一次 的安全注射器， 其特征在于， 所述外套（1 )被芯杆（2)插入的另一端的内 部设有外套内螺紋（lc)和圓锥孔（la), 所述配药针座（3b)设有配药针 座外螺紋（3b3 )和圓锥台 （3bl ), 装有注射针座（4b) 的针座套（ 4c )设 有针座套外螺紋（4c4)和圓锥台 （4c2), 所述配药针座（3b)或装有注射 针座（4b) 的针座套（4c) 与所述外套（1 )分别配合时通过配药针座外螺 紋（3b3)或针座套外螺紋（4c4)分别与外套内螺紋（lc)旋紧使所述配药 针座（3b) 的圓锥台 （3bl )或装有注射针座（4b) 的针座套（4c) 的圓锥 台 （4c2)分别紧密地 ·ί氐顶于所述外套（1 ) 的圓锥孔（la) 中呈密封状态。
4、 根据权利要求 1 所述的一种针头能换且能自动回缩的仅能使用一次 的安全注射器，其特征在于，所述外套（ 1 )的大口端（ le )中设置卡篮（ Id ), 所述卡篮的外侧设有束节（ldl), 所述外套（1 ) 的大口端 （le) 的内缘设置 有能与所述束节（ldl)配合的倒扣装置（ lei ), 从而使之能牢固地固定所述卡 篮（ld)。
5、 根据权利要求 1 所述的一种针头能换且能自动回缩的仅能使用一次 的安全注射器， 其特征在于， 在所述外套（1 ) 的内腔外部的所述芯杆（2) 的另一端利用插接、卡接设置按手（ 2e ),在从所述芯杆（ 2 )的束节平面（ 2a2 ) 至所述按手 （2e) 的任意位置上设置通气孔（2el)。
6、 根据权利要求 2所述的一种针头能换且能自动回缩的仅能使用一次 的安全注射器， 其特征在于，还包括注射针护套（4f), 所述注射针护套（4f) 的内部和针座套（ 4c )的外部分别设有对应的内齿脊（ 4fl )和外齿脊（ 4c5 ), 所述注射针护套（4f)套在所述注射针头 （4)上。
7、 根据权利要求 6所述的一种针头能换且能自动回缩的仅能使用一次 的安全注射器， 其特征在于， 所述注射针护套（4f) 的外缘还设有防滑棱条
(4f2)或 /和双蝶翼或 /和表面滚花。
8、 根据权利要求 3所述的一种针头能换且能自动回缩的仅能使用一次 的安全注射器， 其特征在于， 所述外套（1 ) 的圓锥孔（la) 的内缘设置有 止退内棘齿（lb), 所述针座套（4c)的外缘设置有与所述止退内棘齿（lb) 相对应的止退外棘齿（4c3 )。
9、 根据权利要求 2所述的一种针头能换且能自动回缩的仅能使用一次 的安全注射器， 其特征在于， 所述针座挡帽（4d)通过卡接、 旋接设置在针 座套（4c)上端。
10、根据权利要求 2所述的一种针头能换且能自动回缩的仅能使用一次 的安全注射器， 其特征在于， 所述芯杆（2)、 注射针座（4b )、 针座套（4c)、 针座挡帽 （4d)、 注射针护套（4f)釆用塑料材料制成， 所述外套（1 )釆用 医用级透明塑料材料制成， 所述配药针头 （3) 的配药针管 （3a)和配药针 座（ 3b )釆用医用级无毒硬质塑料材料一体成型。
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5531694A (en) * 1993-08-31 1996-07-02 Clemens; Anton H. Needle retraction system
CN101143238A (zh) * 2007-10-25 2008-03-19 罗松能 弹簧式安全自毁注射器
CN101239210A (zh) * 2008-03-21 2008-08-13 杨育和 一种自毁式安全注射器
CN101690833A (zh) * 2009-09-06 2010-04-07 徐昊华 一种针头可自动回缩安全注射器
CN201453787U (zh) * 2009-04-04 2010-05-12 李慧慧 一次性针尖自动回缩安全注射器
CN101947341A (zh) * 2010-09-15 2011-01-19 徐昊华 一种针头可换且可自动回缩的仅能使用一次的安全注射器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5531694A (en) * 1993-08-31 1996-07-02 Clemens; Anton H. Needle retraction system
CN101143238A (zh) * 2007-10-25 2008-03-19 罗松能 弹簧式安全自毁注射器
CN101239210A (zh) * 2008-03-21 2008-08-13 杨育和 一种自毁式安全注射器
CN201453787U (zh) * 2009-04-04 2010-05-12 李慧慧 一次性针尖自动回缩安全注射器
CN101690833A (zh) * 2009-09-06 2010-04-07 徐昊华 一种针头可自动回缩安全注射器
CN101947341A (zh) * 2010-09-15 2011-01-19 徐昊华 一种针头可换且可自动回缩的仅能使用一次的安全注射器

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