WO2006119667A1 - Seringue de securite jetable - Google Patents

Seringue de securite jetable Download PDF

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Publication number
WO2006119667A1
WO2006119667A1 PCT/CN2005/000647 CN2005000647W WO2006119667A1 WO 2006119667 A1 WO2006119667 A1 WO 2006119667A1 CN 2005000647 W CN2005000647 W CN 2005000647W WO 2006119667 A1 WO2006119667 A1 WO 2006119667A1
Authority
WO
WIPO (PCT)
Prior art keywords
needle
push rod
syringe
groove
cylindrical
Prior art date
Application number
PCT/CN2005/000647
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/CN2005/000647 priority Critical patent/WO2006119667A1/fr
Publication of WO2006119667A1 publication Critical patent/WO2006119667A1/fr

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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    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston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
    • A61M5/315—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
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/50—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
    • A61M5/5066—Means for preventing re-use by disconnection of piston and piston-rod
    • 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
    • A61M2005/31508—Means for blocking or restricting the movement of the rod or piston provided on the 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
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/3231—Proximal end of needle captured or embedded inside piston head, e.g. by friction or hooks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/50—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
    • A61M5/5066—Means for preventing re-use by disconnection of piston and piston-rod
    • A61M2005/5073—Means for preventing re-use by disconnection of piston and piston-rod by breaking or rupturing the connection parts
    • 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
    • A61M5/28—Syringe ampoules or carpules, i.e. ampoules or carpules provided with a needle
    • 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
    • A61M5/3129—Syringe barrels
    • A61M5/3135—Syringe barrels characterised by constructional features of the proximal end
    • 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
    • A61M5/50—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

  • 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 "one-off" in the strict sense of use performance, and can be repeatedly used, leaving hidden dangers for cross-infection, easy Cause the spread of disease.
  • the existing syringe is extremely easy to stab or scratch the surrounding person during the treatment after the injection, 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 present invention provides a disposable safety syringe including a syringe; a needle holder is formed at a front end of the syringe;
  • a needle portion is mounted on the needle seat, the needle portion includes a needle tube seat, a needle tube sleeve, and a needle tube, the rear end of the needle tube sleeve has a cylindrical step, and the center thereof is a through hole, and the needle tube is installed at In the through hole of the needle sleeve;
  • a push rod disposed in the syringe; the front end of the push rod has a top ring;
  • Piston set at the front end of the push rod
  • seal lock ring Sealing the lock ring, the seal lock ring is disposed at a distal end portion of the needle tube seat;
  • the utility model is characterized in that at least one protrusion is arranged on the inner wall surface of the top ring, and the protrusion cooperates with the outer end surface of the cylindrical step at the rear end of the needle sleeve, and when the top ring pushes the sealing ring away, The friction between the projection and the cylindrical step allows the needle cannula to enter the syringe with the pullback action of the push rod along with the needle.
  • the present invention further includes a push rod holder disposed at a rear end of the barrel, the push rod holder including a limit thrust groove, a fitting groove and a lock groove, and at least one card disposed on the connecting rod disposed in the middle of the push rod claw.
  • the claw corresponds to the fitting groove of the push rod support, so that the claw passes smoothly through the push rod support, and the push rod support is set outside the push rod, and the push rod cannot exit the push rod support.
  • the piston is arranged at the front end of the push rod to form a push rod assembly, the push rod assembly is set in the syringe body, and the push rod support of the push rod assembly is clamped on the open end of the needle holder body to form
  • the syringe body assembly, the push rod thrust boss corresponds to the limit thrust groove of the push rod support, and prevents the top ring of the push rod from sliding forward by the accidental force to cause the seal lock ring to slide forward, so that the syringe self-destructs.
  • the needle hub of the syringe body assembly is engaged with the needle portion and combined into a safety syringe having a self-destructing function.
  • FIG. 1 is a schematic view showing the appearance of a syringe according to an embodiment of the present invention
  • FIG. 2 is a schematic cross-sectional view 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.
  • FIG. 5A, FIG. 5B, and FIG. 5C are respectively schematic cross-sectional views of a seal ring according to an embodiment of the present invention
  • FIG. 6 is a cross-sectional view of the syringe of the embodiment of the present invention
  • FIG. 7A is a cross-sectional view showing a pusher according to an embodiment of the present invention.
  • Figure 7B is a partial enlarged view of a portion A of Figure 7A;
  • Figure 7C is an enlarged cross-sectional view taken along line C-C of Figure 7A;
  • Figure 7D is a cross-sectional view taken along line D-D of Figure 7B;
  • FIG. 8A is a cross-sectional view showing a push rod holder according to an embodiment of the present invention.
  • Figure 8B is a schematic view of the direction A in Figure 8A;
  • Figure 8C is a cross-sectional view of the BB direction of Figure 8B;
  • Figure 9 is a cross-sectional view showing a piston of an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a breaking operation according to an embodiment of the present invention.
  • Figure 11A is a cross-sectional view showing a syringe according to a second embodiment of the present invention.
  • Fig. 11B is a partial enlarged view of a portion A in Fig. 11A.
  • the list of parts represented by each label is as follows:
  • the present invention provides a disposable self-destructing syringe comprising a syringe 1, a push rod 2, a push rod piston 3, a needle portion 4, and a push rod holder 6.
  • the push rod piston 3 is fitted 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 extends integrally with the needle end seat 41 at an end surface of the rear end portion of the needle hub 41.
  • the cylinder 415 is concentric with the needle hub 41, and has an inner diameter that closely matches the outer diameter of the seal lock ring 44, and the height is greater 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, a stopper 46 that is contracted toward the center is provided at the front end of the cavity of the needle hub 41.
  • the needle sleeve 42 has a hollow shape, and a central portion thereof is formed with a longitudinal through hole 421.
  • a radially projecting cylindrical step 422 is formed at the rear end of the needle hub 42.
  • 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 sleeve 42 for easy injection.
  • the needle tube 43 is fixedly coupled to the needle tube sleeve 42, which is a phase bond.
  • 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, which is conical. The 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. Finally, the cylindrical through hole 429 extends inward to form a cylindrical through hole 428.
  • the through hole 428 has the smallest diameter among the five 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 diameters of the both ends are the same as the diameters 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 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 is an annular body that 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 hub 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 hub 42 and the end portion of the inner wall 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 whose diameter gradually decreases from the end opposite to the top ring 21.
  • the inner wall of the seal lock ring 44 and the cylindrical shape of the rear end portion of the needle sleeve 42 can be reduced.
  • the contact area between the step 422 and the outer wall surface and the rear end portion of the cavity 411 of the needle hub 41, as shown in FIG. 5A, FIG. 5B and FIG. 5C, may be provided with at least one groove 441 on the inner wall and/or the outer wall surface.
  • Slot 441 can be A variety of different geometric shapes, in this embodiment, are circular arcs.
  • the needle hub 41 has a mating connection structure with the needle hub 11 at the front end of the syringe 1.
  • 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 111 at 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 can be a screw connection structure:
  • the needle hub 11 is an inner spiral
  • the needle hub 41 is an outer spiral
  • the needle hub 41 is an inner spiral.
  • the conical surface of the inner wall surface 112 at the rear end of the needle hub 11 is engaged 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 is assembled after the needle portion 4 is assembled, and the needle hub 41 is assembled with the syringe assembly through the needle hub 11 through its fitting structure.
  • a top ring 21 is formed at the front end of the push rod 2.
  • the top ring 21 corresponds to the seal lock ring 44 for advancing the seal lock ring 44 in the needle hub 41.
  • the top ring 21 is a torus in the preferred embodiment, and has at least one projection 212 made of an elastic material (e.g., medical plastic) on its inner wall surface.
  • the protrusion 212 is in contact with the outer end surface of the cylindrical step 422 at the rear end portion of the needle sleeve, so that the needle sleeve 42 (along with the needle tube 43) acts under the friction between the protrusion 212 and the outer end surface of the step 422. With the pullback of the push rod 2, it smoothly enters the inside of the syringe 1.
  • the protrusion 212 can be any number, any shape, any size, and is located at any position on the inner wall surface of the top ring 21, as long as it can contact the outer end surface of the step 422 to generate a friction force, the friction force can be as long as
  • the needle cannula 42 (along with the needle cannula 43) can be moved into the syringe 1 following the pusher 2.
  • the projections 212 are three spaced apart and identical prisms disposed uniformly on the inner wall surface of the top ring 21, the prisms having a triangular cross section.
  • the top ring 21 and the prism 212 can be integrally formed with the push rod 2.
  • the prisms 212 are distributed longitudinally along the top ring 21 and have a length equal to the height of the top ring 21.
  • the diameter of the cylinder surrounded by the three edges of the three prisms 212 is slightly smaller than the inner diameter of the seal lock ring 44 to facilitate pushing the top ring 21 away from the seal lock ring 44.
  • the height of the top ring 21 is equal to or greater than the height of the sealing lock ring 44. In this embodiment, The height of the top ring 21 is equal to the height of the seal lock ring 44.
  • the outer diameter of the top ring 21 is slightly smaller than the outer diameter of the seal lock ring 44, or the outer surface of the top ring 21 may also be a tapered surface whose diameter decreases in the direction of the seal lock ring 44.
  • the three prisms 212 of the top ring 21 are in contact with the outer end surface of the cylindrical step 422 at the rear end of the needle sleeve 42 to generate friction, so that the needle sleeve 42 (along with the needle tube 43) is under the action of friction, with the push rod 2 Pull back and smoothly into the syringe 1.
  • the front end surface 23 of the top ring 21 is provided with at least one notch 211. In the preferred embodiment, the two notches 211 are symmetrically distributed. When the medicine is injected, the liquid medicine flows into the needle tube 43 through the notch 211, thereby preventing the liquid residue from remaining.
  • the top ring 21 may be formed by at least one top post, and the inner surface of the top post may be provided with a protrusion 212, which may be a columnar body or a partial toroidal body. There is a gap between the adjacent two top columns for the passage of the drug solution.
  • the push rod 2 is similar to the push rod of the conventional syringe, the rear end of which is an injection handle 24, the front end is provided with a piston 3, and the intermediate connecting rod 25 is a cross. Reinforcement structure.
  • four thrust bosses 22 are provided at one end of the connecting rod 25 near the handle 24.
  • a top ring 21 is provided at the front end of the push rod 2, and the top ring 21 corresponds to the seal lock ring 44.
  • At least one claw 28 is formed on the cross rib structure of the connecting rod 25 near one end of the top ring 21.
  • claws 28 which are formed integrally with the pusher 2 and which are located on the ribs of the cross structure and are symmetrically distributed.
  • the shape is such that a V-shaped opening 286 is formed on the opposite cross ribs of the connecting rod 25 toward the top ring 21 end and the opening angle is small, and a circular hole 281 is opened at the bottom of the opening 286 to avoid the card.
  • a trapezoidal claw body 284 is formed outwardly from the outer corner 283. In the natural state, the distance from the outermost end 285 of the claw body 284 to the intersection of the cross ribs is greater than the distance from the outermost end of the connecting rod 25 to the intersection of the cross ribs, and when the claw body 284 is subjected to the component force perpendicular to the outer corner 283, the claw 28 outer corner edge 283 moves inwardly.
  • the distance from the outermost end 285 of the claw body 284 to the intersection of the cross rib is equal to the outermost end of the connecting rod 25 to the cross rib.
  • Four symmetrically distributed V-shaped slits 29 are formed in the four ribs of the connecting rod 25 near the end 28 of the claw, and the size and position of the opening are as long as the strength of the pusher 2 for the proper working of the injector is ensured.
  • the distance from the slit 29 to the piston 3 is slightly larger than the height of the pusher holder 6, so that the pusher 2 is broken outside the syringe 1 after the injection is completed.
  • the rear end of the syringe 1 is disposed.
  • the push rod holder 6 is a cylinder 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 push rod holder 6 is disposed inside the barrel 1, the outer wall surface 63 of the hollow cylinder is a conical surface, and the inner wall surface 12 of the barrel 1 in contact with the conical surface 63 of the push rod holder 6 is also the outer wall surface 63.
  • the mating conical surface, and the small end diameter of the inner wall surface 12 is smaller than the large end diameter of the outer wall surface 63.
  • the outer wall surface 63 of the push rod holder 6 extends outward to form an annular protrusion 67, and the annular protrusion 67 cooperates with the inner wall surface 13 of the barrel 1, so that the push rod holder cannot move to the outside of the barrel after assembly, and the push rod is assembled.
  • the holder 6 is fixed to the open end of the barrel 1 and cannot be moved.
  • At least one thrust groove 62, at least one fitting groove 65 and at least one locking groove 66 are formed in the inner wall surface of the hollow cylindrical portion of the push rod holder 6 disposed outside the barrel 1.
  • two 180-degree symmetric thrust grooves 6 are provided with two 180-degree symmetrical mounting grooves 65 and four spaced apart between the thrust groove 62 and the fitting groove 65 to allow for injection.
  • the above eight grooves are evenly distributed on the inner wall surface of the hollow cylindrical portion of the push rod holder 6.
  • the thrust boss 22 will be blocked by the thrust groove 62 and will not continue to advance, thereby ensuring that the seal lock ring 44 will not be accidentally opened by the top ring 21.
  • the length of the thrust groove 62 is only required to ensure that the top ring 21 has no contact with the sealing lock ring 44 when the thrust boss 22 is completely inserted therein; the length of the fitting groove 65 is larger than the thrust groove 62, and the rear end thereof is formed.
  • the inclined surface has a direction opposite to the opening direction of the claw 28, and the end thereof is flush with the inner wall surface of the hollow cylindrical body of the push rod holder 6; and the length of the locking groove 66 is only required to ensure that when the thrust boss 22 completely enters the same In the meantime, the top ring 21 can completely push the seal lock ring 44 away from the cylindrical step 422 at the rear end portion of the needle sleeve 42.
  • at least one radially through slot 69 is provided in the axial direction of the pusher mount 6, in this embodiment two slots 69 which are 180 degrees apart.
  • the push rod holder 6 when the push rod holder 6 is inserted into the rear end of the barrel 1, the push rod holder can be elastically deformed to be fixed to the rear end portion of the barrel 1 in a tight fit manner.
  • the two jaws 28 correspond to the fitting groove 65, and the pusher top ring 21 is pushed forward from the rear end 68 of the pusher holder 6, and when the claw 28 comes into contact with the fitting groove 65, the claw 28 is subjected to a radial force.
  • the outer corner 283 of the claw 28 moves inwardly.
  • the claw 28 passes through the push rod smoothly.
  • the support 6 is in a natural state, and the pusher support 6 is placed outside the pusher 2 and cannot be withdrawn from the pusher support 6.
  • the thrust & table 22 cooperates with the thrust groove 62 to prevent the top ring 21 of the push rod 2 from being accidentally forced to push the seal lock ring 44 forward.
  • Lock slot 66 pushes Move, you can do the injection.
  • the needle cannula 42 (along with the needle cannula 43) is pulled back into the syringe 1, and the pusher 2 continues to move rearwardly, the inner surface 64 of the jaw 28 and the pusher holder 6 Upon contact, being squeezed, the outer corner 283 of the jaw 28 moves inwardly.
  • 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 top ring A notch 211 is formed in the opening 21, so that the liquid medicine outside the top ring 21 can enter the inside of the top ring 21 from the notch 211 and be injected into the needle tube 43, thereby avoiding the residue of the chemical liquid.
  • the top ring 21 may have a shape in which a cylindrical body 23a is formed at the front end of the push rod 2, and is disposed on the outer circumferential surface of the cylindrical body 23a.
  • a top ring or top post 21 is disposed at the periphery of the cylindrical body 23a.
  • a groove 429a corresponding to the cylindrical body 23a is formed in the cylindrical step 422 at the rear end portion of the needle sleeve 42, and the depth of the groove 429a is the same as the height of the cylindrical body 23a.
  • the groove 429a and the protrusion 212 are tightly fitted.
  • the height of the top ring 21 is small.
  • the height of the cylinder 23a is as long as it can ensure that when the cylinder 23a is completely inserted into the groove 429a, the top ring
  • the seal ring 44 provided on the cylindrical step 422 at the rear end portion of the needle hub 42 can be pushed away from the step 422.
  • the cylinder 23a is completely inserted into the groove 429a.
  • the protrusion 212 on the cylinder 23a is in contact with the inner wall surface of the groove 429a, and the capillary sleeve 42 can be obtained by the friction between the two.
  • the needle tube 43 enters the barrel 1 as the push rod 2 is pulled back, and the effect described in the first embodiment of the present invention can also be achieved.
  • 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 overcomes the need for the syringe to rebound. Give patients a painful residual problem. , , ⁇ , , ⁇

Abstract

La présente invention concerne une seringue de sécurité jetable comprenant un tube (1), un piston (2), un support d'aiguille (42) et une aiguille (43). Un pas cylindrique (422) est prévu sur l'extrémité arrière du support d'aiguille (42). Un anneau supérieur (21) est prévu sur l'extrémité avant du piston (2). Un anneau d'étanchéité (44) est prévu sur l'extrémité distale du pavillon de l'aiguille (41). Au moins une protubérance (212) qui s'engage sur la face de l'extrémité extérieure du pas cylindrique (422) est prévue sur la face intérieure de l'anneau supérieur (21). Après que l'anneau d'étanchéité (44) ait été repoussé par l'anneau supérieur (21), le support d'aiguille (42) et l'aiguille (43) sont rétractés, de même que le piston (2), dans le tube (1), en utilisant la friction entre la protubérance (212) et le pas cylindrique (422). Entre temps, le cliquet (28) est rétracté pour revenir brusquement dans la fente de verrouillage du support du piston, de façon à ce que le piston (2) puisse être rompu dans l'interstice en forme de V afin d'éviter la réutilisation de la seringue.
PCT/CN2005/000647 2005-05-10 2005-05-10 Seringue de securite jetable WO2006119667A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2005/000647 WO2006119667A1 (fr) 2005-05-10 2005-05-10 Seringue de securite jetable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2005/000647 WO2006119667A1 (fr) 2005-05-10 2005-05-10 Seringue de securite jetable

Publications (1)

Publication Number Publication Date
WO2006119667A1 true WO2006119667A1 (fr) 2006-11-16

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ID=37396173

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2005/000647 WO2006119667A1 (fr) 2005-05-10 2005-05-10 Seringue de securite jetable

Country Status (1)

Country Link
WO (1) WO2006119667A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009097742A1 (fr) * 2008-02-04 2009-08-13 Dongsen Fang Injecteur sûr
WO2009100644A1 (fr) * 2008-02-04 2009-08-20 Dongsen Fang Injecteur sûr à rétraction automatique
US8079980B2 (en) 2007-04-24 2011-12-20 Morgan Meditech Inc. Single use syringe
US8287491B2 (en) 2008-11-26 2012-10-16 Becton, Dickinson And Company Single-use auto-disable syringe
WO2013070663A1 (fr) * 2011-11-11 2013-05-16 Becton, Dickinson And Company Piston plongeur retenant des ancres
CN103272308A (zh) * 2013-05-15 2013-09-04 浙江康泰医疗器械有限公司 新型钢针自缩打针筒
CN105148355A (zh) * 2015-09-14 2015-12-16 浙江华福医用器材有限公司 注射器
CN107617143A (zh) * 2017-09-19 2018-01-23 李奇元 一种注射器用拉杆装置
CN109646297A (zh) * 2019-01-21 2019-04-19 杭州堃博生物科技有限公司 注射器及其锁止件
CN112932549A (zh) * 2021-01-28 2021-06-11 中国人民解放军陆军军医大学 一种基于双注射器的实验鼠脑脊液抽取装置

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US5578015A (en) * 1989-09-18 1996-11-26 Robb Pascal Patent Limited Safety syringe incorporating automatic needle holder release
US5993418A (en) * 1998-02-24 1999-11-30 Medisys Technologies, Inc. Safety syringe
CN2395732Y (zh) * 1999-11-29 2000-09-13 黄吴顺 改进结构的安全注射器
CN2407769Y (zh) * 2000-03-14 2000-11-29 罗正己 安全注射器
CN2461574Y (zh) * 2001-01-05 2001-11-28 王琳 扭转回缩式安全注射针筒
CN2678666Y (zh) * 2003-11-26 2005-02-16 吕海洋 一次性自毁安全注射器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5578015A (en) * 1989-09-18 1996-11-26 Robb Pascal Patent Limited Safety syringe incorporating automatic needle holder release
US5993418A (en) * 1998-02-24 1999-11-30 Medisys Technologies, Inc. Safety syringe
CN2395732Y (zh) * 1999-11-29 2000-09-13 黄吴顺 改进结构的安全注射器
CN2407769Y (zh) * 2000-03-14 2000-11-29 罗正己 安全注射器
CN2461574Y (zh) * 2001-01-05 2001-11-28 王琳 扭转回缩式安全注射针筒
CN2678666Y (zh) * 2003-11-26 2005-02-16 吕海洋 一次性自毁安全注射器

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8079980B2 (en) 2007-04-24 2011-12-20 Morgan Meditech Inc. Single use syringe
WO2009097742A1 (fr) * 2008-02-04 2009-08-13 Dongsen Fang Injecteur sûr
WO2009100644A1 (fr) * 2008-02-04 2009-08-20 Dongsen Fang Injecteur sûr à rétraction automatique
US9205205B2 (en) 2008-11-26 2015-12-08 Becton, Dickinson And Company Single-use auto-disable syringe
US8287491B2 (en) 2008-11-26 2012-10-16 Becton, Dickinson And Company Single-use auto-disable syringe
WO2013070663A1 (fr) * 2011-11-11 2013-05-16 Becton, Dickinson And Company Piston plongeur retenant des ancres
CN103272308A (zh) * 2013-05-15 2013-09-04 浙江康泰医疗器械有限公司 新型钢针自缩打针筒
CN105148355A (zh) * 2015-09-14 2015-12-16 浙江华福医用器材有限公司 注射器
CN107617143A (zh) * 2017-09-19 2018-01-23 李奇元 一种注射器用拉杆装置
CN107617143B (zh) * 2017-09-19 2020-11-20 洪模型 一种注射器用拉杆装置
CN109646297A (zh) * 2019-01-21 2019-04-19 杭州堃博生物科技有限公司 注射器及其锁止件
CN112932549A (zh) * 2021-01-28 2021-06-11 中国人民解放军陆军军医大学 一种基于双注射器的实验鼠脑脊液抽取装置
CN112932549B (zh) * 2021-01-28 2022-07-05 中国人民解放军陆军军医大学 一种基于双注射器的实验鼠脑脊液抽取装置

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