WO2006076829A1 - Seringue jetable - Google Patents

Seringue jetable Download PDF

Info

Publication number
WO2006076829A1
WO2006076829A1 PCT/CN2005/000092 CN2005000092W WO2006076829A1 WO 2006076829 A1 WO2006076829 A1 WO 2006076829A1 CN 2005000092 W CN2005000092 W CN 2005000092W WO 2006076829 A1 WO2006076829 A1 WO 2006076829A1
Authority
WO
WIPO (PCT)
Prior art keywords
needle
hook
hole
syringe
push rod
Prior art date
Application number
PCT/CN2005/000092
Other languages
English (en)
Chinese (zh)
Inventor
Hsienwen Hsieh
Original Assignee
Hsienwen Hsieh
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 Hsienwen Hsieh filed Critical Hsienwen Hsieh
Priority to PCT/CN2005/000092 priority Critical patent/WO2006076829A1/fr
Publication of WO2006076829A1 publication Critical patent/WO2006076829A1/fr

Links

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    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston

Definitions

  • This invention relates to syringes in the field of medical devices, and more particularly to a disposable safety syringe. Background technique .
  • a syringe is a commonly used medical device.
  • the existing syringes generally do not have a self-destructive protective structure, so that the existing syringes are not strictly "one-off" in terms of performance, and can be repeatedly used, leaving hidden dangers for cross-infection, easy Cause the spread of disease.
  • the exposed needle is extremely easy to stab or scratch the surrounding person, resulting in a new cross infection.
  • the safety syringe of Chinese Patent No. 98250220.6 consists of a syringe, a needle assembly, a snap seat, a push rod and a chuck.
  • the engaging seat is located at the front end of the syringe, and the needle assembly is combined with the front end of the engaging seat.
  • the rear end of the engaging seat has a hole.
  • the chuck is placed at the front end of the push rod. When the push rod is advanced toward the front end of the injection cylinder, the chuck engages with the engaging seat. When the push rod is pulled back, the engaging seat is pulled together with the needle assembly into the housing of the syringe to prevent the needle from stabbing the human body for the purpose of single use.
  • a safety syringe comprising a needle cannula, a needle cannula, a needle hub, a sealing element, a spring. It has the function of automatically destroying the syringe after the injection is completed.
  • the structure of the syringe is too complicated, increasing production costs.
  • this structure also causes defects in which a large amount of liquid remains.
  • the needle automatically pops out of the patient's body and enters the syringe before the medical staff has unplugged the needle from the patient, thereby causing great pain to the patient. . Therefore, the practicality is poor. Summary of the invention
  • the object of the present invention is to provide a disposable safety syringe having a protective self-destructing structure and a thorough injection of the drug solution, in view of the drawbacks of the prior art syringe.
  • the single-use safety syringe of the present invention comprises: a syringe; a push rod disposed in the barrel having a portion that conforms to an inner wall of the barrel and slidable along an inner wall of the barrel; a needle holder is integrally formed at a front end of the syringe;
  • a needle portion is mounted on the needle seat, the needle portion comprising: a needle tube seat, a needle tube sleeve, Needle;
  • the rear end of the needle sleeve has a cylindrical step, and the center thereof is a through hole; the needle tube is installed in the through hole of the needle tube sleeve, and the needle tip protrudes from the needle tube sleeve; the center of the needle tube holder is continuous a cavity, the needle tube seat and the needle seat have a mating connection structure, wherein: a sealing lock ring is mounted on an outer end surface of the cylindrical step at the rear end portion of the needle tube sleeve, and the sealing lock ring is fitted a distal end portion of the cavity of the needle hub; the front end of the push rod has at least one hook, the hook is opposite to the sealing lock ring, and the shape of the hook and the end of the step toward the end of the needle tip Face to match.
  • the hook buckle can be on the end surface of the step, so that the needle sleeve and the needle tube can follow The push rod is pulled back and retracted into the syringe to avoid reuse.
  • FIG. 1 is a schematic view showing the appearance of a syringe according to an embodiment of the present invention
  • FIG. 2 is a cross-sectional view showing the internal structure of a syringe according to an embodiment of the present invention
  • FIG. 3 is a cross-sectional view showing a needle hub of an embodiment of the present invention.
  • FIG. 4 is a cross-sectional view showing a needle sleeve of an embodiment of the present invention.
  • Figure 5 is a cross-sectional view showing a syringe of an embodiment of the present invention.
  • Figure 6 is a partial enlarged view of a portion A in Figure 2;
  • Figure 7 is a schematic view of the B direction in Figure 6;
  • Figure 8 is a cross-sectional view showing a push rod holder according to an embodiment of the present invention.
  • Figure 9 is a cross-sectional view showing a portion of a push rod with a thrust boss according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural view of a hook according to a second embodiment of the present invention.
  • Figure 11 is a schematic view of the C direction in Figure 10;
  • Figure 12 is a cross-sectional view showing the structure of a hook according to a third embodiment of the present invention. detailed description
  • the disposable safety syringe of the present invention comprises a syringe 1, a push rod 2, a push rod piston 3, and a needle portion 4.
  • the push rod piston 3 is attached to the front end portion of the push rod 2.
  • the largest portion of the outer diameter of the push rod piston 3 coincides with the inner wall of the barrel 1 and is slidable longitudinally along the inner wall.
  • a needle holder 11 is provided at the front end of the syringe 1, and the needle holder 11 can be integrally molded with the syringe 1 during processing.
  • the needle portion 4 is mounted on the needle hub 11. This part of the technology is similar to existing syringes and will not be described in detail here.
  • the needle portion 4 includes a needle hub 41, a needle cannula 42, a needle tube 43, and a seal lock ring 44.
  • the center of the needle hub 41 is a through cavity 411 which can accommodate the needle can 42 and allow the needle can 42 to slide in the longitudinal direction.
  • a hollow cylinder 415 is integrally formed on the end surface of the rear end portion of the needle hub 41 and the needle hub 41.
  • the cylinder 415 is concentric with the needle hub 41, and the inner diameter thereof is tightly matched with the outer diameter of the sealing lock ring 44, and the height thereof is larger than the seal lock.
  • the height of the ring 44 is twice.
  • the outer cylindrical surface 416 of the circular cylinder 415 is a conical surface.
  • An external thread 413 is provided on the outer circumferential surface of the joint between the cylinder 415 and the needle hub 41. Under the push of the push rod 2, in order to prevent the needle sleeve 42 from sliding forward, the front end of the cavity of the needle hub 41 has a centrally-retracted catch 46.
  • the needle sleeve 42 has a hollow shape, and a central portion thereof is formed with a longitudinal through hole 421.
  • a radially protruding cylindrical step 422 is formed at the rear end of the needle sleeve 42: a circular groove 430 is formed inwardly from the outer edge on the end surface 432 of the cylindrical step 422 toward the needle tip 431-end, in this embodiment
  • the cross-sectional shape of the groove 430 is a triangle, and may of course be 'other geometric shapes'.
  • the needle tube 43 is mounted in the through hole 421 of the needle cannula 42 such that the bottom surface thereof is flush with the bottom surface 427 of the needle cannula 42 to further reduce the residual of the chemical liquid at the time of injection.
  • the needle tip 431 protrudes beyond the needle cannula 42 for easy injection.
  • the needle tube 43 is bonded to the needle cannula 42 so that the needle tube 43 does not retract into the needle cannula 42 at the time of injection.
  • the diameter of the front end of the through hole 421 is varied, and is composed of the following five through holes: First, a cylindrical through hole 424 is formed inwardly from the front end surface 423, and the cylindrical through hole 424 extends inward to form a conical through hole 425.
  • the conical through hole 425 extends inwardly with a spherical through hole 426.
  • the spherical through hole 426 further extends inwardly with a cylindrical through hole 429.
  • the cylindrical through hole 429 extends inward to form a cylindrical through hole 428.
  • the diameter of the through hole 428 is the smallest of all the through holes, and is the same as the outer diameter of the needle tube 43, and the two are tight fits.
  • the center diameter of the spherical through hole 426 is the same as the diameter of the cylindrical through hole 424, and the diameter of both ends is the same as the diameter of the small end of the cylindrical through hole 429 and the conical through hole 425, respectively, and the diameters of the above five through holes are It is smaller than the diameter of other portions of the through hole 421.
  • the change diameter is designed such that when the needle tube 43 and the needle sleeve 42 are glued, the glue can smoothly enter the inner wall surfaces of the through holes 424, 425, 426, and 429, and the accumulation is formed in the spherical through holes 426.
  • the needle tube 43 can be more firmly bonded in the through hole 421.
  • the seal lock ring 44 has a circular ring shape, is mounted on the outer end surface of the cylindrical step 422 at the rear end portion of the needle tube sleeve 42, and is caught at the rear end portion of the cavity 411 of the needle tube seat 41. That is, the seal lock ring 44 is fastened between the outer end surface of the cylindrical step 422 at the rear end portion of the needle tube sleeve 42 and the end portion of the cavity 411 of the needle hub 41.
  • the sealing lock ring 44 on the one hand ensures a seal between the needle cannula 42 and the needle cannula 41, and on the other hand the needle cannula 42 (along with the needle cannula 43) is fixedly mounted on the needle cannula 41.
  • the outer circumferential surface thereof is a conical surface having a diameter from the opposite side of the hook 21. One end begins to shrink gradually.
  • the needle hub 41 has a mating connection structure with the needle hub 11 at the front end of the syringe 1. As shown in Fig. 5, the syringe 1 is a hollow cylinder integrally formed at a joint portion of the front portion thereof with the needle hub 41 to form a needle holder 11.
  • the needle holder 11 is a hollow cylinder concentric with the barrel 1, and is provided with an internal thread on the inner wall surface in the front end thereof; and the inner wall surface 112 at the rear end thereof is a conical surface.
  • a conical surface 12 is formed on the inner wall surface of the rear end of the barrel 1.
  • the mating connection structure between the needle hub 41 and the needle hub 11 at the front end of the syringe 1 can be a spiral connection structure:
  • the needle holder 11 is an inner spiral
  • the needle holder 41 is External spiral.
  • the needle hub 11 is an outer spiral
  • the needle hub 41 is an inner spiral.
  • the conical surface of the inner wall surface 112 of the rear end of the needle hub 11 cooperates with the conical surface of the outer cylindrical surface 416 of the cylindrical body 415 of the needle hub 41.
  • the mating connection structure is an embedded card structure.
  • the front end 111 of the needle hub 11 is an embedded bayonet, and the rear end 413 of the needle hub 41 is a latch that cooperates with the bayonet.
  • the above structure of the present invention when assembled, assembles the needle hub 41 with the needle hub 11 through its mating structure. .
  • the front end of the push rod 2 has at least one hook 21 made of an elastic material such as medical plastic.
  • the two hooks 21 respectively include a body 211 and a hook portion 212 formed integrally with the body 211.
  • the two bodies 211 are opposite the seal lock ring 44 and have a length greater than the height of the rear end step 422 of the needle tube sleeve 42.
  • the length of the body 211 ensures that the hook 21 can be snapped into the recess 430 after the hook 21 completely pushes the seal lock ring 44 away from the outer end surface of the cylindrical step 422 at the rear end portion of the needle sleeve.
  • the body 211 is an elongated plate-like body having a cross-sectional shape of a cylindrical wall which is uniformly distributed on the annular cylinder, the arc of which is the same as the circular arc of the sealing lock ring 44, and the section thickness is slightly smaller than the wall of the sealing lock ring 44. thick.
  • the body 211 integrally extends inwardly to form a hook portion 212, and an angle between the inner surface 213 of the hook portion 212 and the inner surface 214 of the body 211 is less than 90 degrees.
  • the shape and size of the two hook portions 212 cooperate with the groove 430 of the needle sleeve 42.
  • the hook portion 212 has a triangular cross section to ensure that the hook portion 212 when the hook 21 pushes the sealing lock ring 44 apart. It can be hooked in the recess 430.
  • the hook 21 is used to advance the seal lock ring 44 in the needle hub 41 when the injection is completed.
  • the seal lock ring 44 When the seal lock ring 44 is pushed away from the rear end step 422 of the needle cannula 42 by the hook 21, the constraint on the needle cannula 42 can be released.
  • the hook 21 pushes the lock ring 44, the thickness of the cross section of the body 211 of the hook 21 is slightly smaller than the wall thickness of the seal lock ring 44, that is, the cylindrical step 422 smaller than the rear end of the needle sleeve 42 and the rear end of the needle hub 41.
  • Gap distance between hollow cylinders 415, and hook hooks The maximum thickness of the section 212 is less than or equal to the wall thickness of the sealing lock ring 44, and since the hook 21 is made of an elastic material, the hook 21 generates an outward elastic deformation when the sealing lock ring 44 is pushed, thereby ensuring When the hook 21 pushes the seal lock ring 44, the hook 21 can move in the gap between the cylindrical step 422 at the rear end of the needle hub 42 and the hollow cylinder 415 at the rear end of the needle hub 41; when the hook 21 will When the sealing lock ring 44 is completely pushed away from the step 422, the hook portion 212 is hooked inwardly against the recess 430 of the needle cannula 42 by the elastic restoring force.
  • FIGS. 10 and 11 are schematic views showing the structure of a hook 21 according to a second embodiment of the present invention.
  • the front end of the push rod 2 has three hooks 21 made of an elastic material such as medical plastic.
  • the three hooks 21 are disposed at equal intervals of 120 degrees on the same circumference. It can ensure that when the push rod 2 is pulled back, the hook 21 can be firmly hooked in the groove 430 of the needle sleeve 42, and the needle sleeve 42 (along with the needle tube 43) can be smoothly pulled back into the barrel 1.
  • Figure 12 is a cross-sectional view showing the structure of a hook 21 according to a third embodiment of the present invention.
  • the hook portion 212 of the hook 21 has a right-angled triangle. That is, the angle between the inner surface 213 of the hook portion 212 and the inner surface 214 of the body 211 is equal to 90 degrees. Therefore, in the present embodiment, the recess 430 is not required to be formed on the step 422 of the needle sleeve 42, but is directly hooked on the end surface 432 of the step 422 toward the end 432 of the needle tip 432 by the inner surface 213 of the hook portion 212.
  • the needle cannula 42 (along with the needle cannula 43) is thereby pulled back into the syringe 1 with the pusher 2.
  • the cross-section of the hook portion 212 can also be trapezoidal or other geometric shape, as long as the inner surface 213 of the hook portion 212 can be hooked on the end surface 432 of the step 422 toward the tip end of the needle tip 431 and the cannula sleeve 42 (along with the needle tube 43) Pull back into the syringe 1.
  • Push rod support 6 is a cylindrical body having a through hole 61 in the middle. The diameter of the through hole 61 is slightly larger than the diameter of the push rod 2, so that the push rod 2 can be inserted into the through hole 61 and can slide in the through hole.
  • the outer wall surface 63 of the hollow cylinder provided inside the cylinder 1 is a conical surface, and the inner wall surface 12 of the cylinder 1 in contact with the conical surface 63 of the push rod holder 6 is also opposite to the outer wall surface 63.
  • the conical surface is fitted, and the small end diameter of the inner wall surface 12 is smaller than the large end diameter of the outer wall surface 63.
  • At least one thrust groove 62 is formed on the inner wall surface of the hollow cylindrical portion of the push rod holder 6 disposed outside the barrel 1.
  • the circumferential surface at the corresponding position of the rear end of the push rod 2 is provided with the thrust groove 62. Fitted thrust boss 22.
  • the thrust boss 22 of the push rod 2 is pushed against the thrust groove 62 of the push rod support 6 and pushed forward. After the lever 2, the thrust boss 22 will be blocked by the thrust groove and cannot continue to advance, thereby ensuring that the seal lock ring 44 is not accidentally opened by the hook 21.
  • the hook 21 pushes the sealing lock ring 44 away from the rear end step 422 of the needle cannula 42.
  • the hook 21 completely pushes the sealing lock ring 44 away from the rear end step 422 of the needle cannula 42, the hook The bottom surface 23 of the 21 is in contact with the end end surface 427 of the needle hub 42, ensuring that the residual amount of the chemical liquid is small.
  • the push rod piston 3 is completely in contact with the bottom of the syringe 1, since the shape of the push rod piston 3 coincides with the shape of the inner wall of the syringe 1, and the hook is A notch 211 is formed in the opening 21, so that the liquid medicine outside the hook 21 can enter the inside of the hook 21 from the notch 211 and be injected into the needle tube 43, thereby avoiding the residue of the chemical liquid.
  • the needle cannula 42 cannot be positioned to prevent reuse. It is also possible that since the needle hub 42 and/or the needle tube 43 push the push rod 2 forward again, it will be placed on the catch 46 and cannot be protruded from the top opening of the needle hub 41 to be crushed. At the same time, the push rod 2 can be broken so that the entire syringe can no longer be used, so that the syringe can be self-destructed for one use only, avoiding repeated use of the syringe.
  • the present invention is a controllable self-destructive behavior. Since the retraction of the needle cannula 43 of the present invention is performed after the needle tip 431 is pulled out of the patient, it does not cause pain to the patient, and the syringe disclosed in WO 02/087669 is well overcome when the needle is rebounded. It brings painful defects to the patient; and it also overcomes the problem of a large amount of residual liquid in the prior art due to unreasonable structure.

Abstract

La présente invention concerne une seringue jetable comprenant un corps de pompe (l), un piston (2), un raccord d’aiguille (l 1) et un composant d’aiguille (4). Le composant d’aiguille (4) comprend un raccord de tube d’aiguille (41), une gaine de tube d’aiguille (42) et un tube d’aiguille (43). Un anneau de verrouillage hermétique (44) est ajusté sur la face d’extrémité externe du cylindre (422) à l’extrémité arrière de la gaine de tube d’aiguille (42). On trouve un crochet de blocage (21) face à l’anneau de verrouillage hermétique (44) au niveau de l’extrémité avant du piston (2). Lorsque ce crochet de blocage (21) pousse complètement l’anneau de verrouillage hermétique (44) de la face d’extrémité externe de cylindre (422) à l’extrémité arrière de la gaine de tube d’aiguille (42), le crochet de blocage (21) peut être fixé sur la face d’extrémité externe (432) du cylindre (422), amenant la gaine de tube d’aiguille (42) et le tube d’aiguille (43) à se rétracter dans le corps de pompe (l) en raison de l’aspiration par le piston (2), empêchant ainsi la réutilisation de la seringue.
PCT/CN2005/000092 2005-01-21 2005-01-21 Seringue jetable WO2006076829A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2005/000092 WO2006076829A1 (fr) 2005-01-21 2005-01-21 Seringue jetable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2005/000092 WO2006076829A1 (fr) 2005-01-21 2005-01-21 Seringue jetable

Publications (1)

Publication Number Publication Date
WO2006076829A1 true WO2006076829A1 (fr) 2006-07-27

Family

ID=36691964

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2005/000092 WO2006076829A1 (fr) 2005-01-21 2005-01-21 Seringue jetable

Country Status (1)

Country Link
WO (1) WO2006076829A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5171300A (en) * 1988-02-01 1992-12-15 Medtech Group, Inc. Disposable hypodermic syringe
CN2137961Y (zh) * 1992-10-09 1993-07-14 陈隆雄 防护注射安全针筒
US5395346A (en) * 1993-07-26 1995-03-07 Maggioni; Tarcisio Disposable syringe with a retractable needle
CN2234785Y (zh) * 1995-12-29 1996-09-11 谢玉奇 安全型一次性医疗用注射器
CN2270509Y (zh) * 1996-10-07 1997-12-17 黄果 回拉式安全注射器
US6193695B1 (en) * 2000-01-14 2001-02-27 Wayland J. Rippstein, Jr. Disposable safety syringe having a retractable needle
CN2438463Y (zh) * 2000-09-04 2001-07-11 张淑红 一次性安全注射器

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5171300A (en) * 1988-02-01 1992-12-15 Medtech Group, Inc. Disposable hypodermic syringe
CN2137961Y (zh) * 1992-10-09 1993-07-14 陈隆雄 防护注射安全针筒
US5395346A (en) * 1993-07-26 1995-03-07 Maggioni; Tarcisio Disposable syringe with a retractable needle
CN2234785Y (zh) * 1995-12-29 1996-09-11 谢玉奇 安全型一次性医疗用注射器
CN2270509Y (zh) * 1996-10-07 1997-12-17 黄果 回拉式安全注射器
US6193695B1 (en) * 2000-01-14 2001-02-27 Wayland J. Rippstein, Jr. Disposable safety syringe having a retractable needle
CN2438463Y (zh) * 2000-09-04 2001-07-11 张淑红 一次性安全注射器

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