KR200451044Y1 - Reusable disposable syringe with anti-rotation structure of plunger - Google Patents

Reusable disposable syringe with anti-rotation structure of plunger Download PDF

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Publication number
KR200451044Y1
KR200451044Y1 KR2020100006874U KR20100006874U KR200451044Y1 KR 200451044 Y1 KR200451044 Y1 KR 200451044Y1 KR 2020100006874 U KR2020100006874 U KR 2020100006874U KR 20100006874 U KR20100006874 U KR 20100006874U KR 200451044 Y1 KR200451044 Y1 KR 200451044Y1
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KR
South Korea
Prior art keywords
plunger
barrel
gasket
tip
syringe
Prior art date
Application number
KR2020100006874U
Other languages
Korean (ko)
Inventor
김기원
Original Assignee
김기원
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Publication date
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Priority to KR2020100006874U priority Critical patent/KR200451044Y1/en
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Publication of KR200451044Y1 publication Critical patent/KR200451044Y1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • 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
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/50—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
    • A61M5/5013—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe
    • A61M5/502—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe for blocking the piston
    • 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
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M2005/31516—Piston or piston-rod constructions, e.g. connection of piston with piston-rod reducing dead-space in the syringe barrel after delivery
    • 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
    • A61M2005/5033—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe for blocking the piston by use of an intermediate blocking member positioned between the syringe barrel and the piston rod to prevent retraction of the latter, e.g. toothed clip placed 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
    • A61M5/50—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

Abstract

The present invention forms a rectangular protrusion on the gasket support and the lower plate and forms a connection portion at the same time the tip of the barrel at the same time so that the gasket portion serving as a piston can be easily cut at the time of rear movement to prevent reuse of the disposable syringe. By forming a locking part inside the part and correspondingly forming a wedge-shaped protrusion at the tip of the plunger, the connection part is simply cut when the plunger is moved backward after the chemical liquid in the syringe is completely discharged to the injection needle, thereby effectively reusing the syringe. It is effective to prevent.

Description

AUTO DISABLE SYRINGE WITH A STRUCTURE PREVENTING FROM TURNING OF PLUNGER}

The present invention relates to an anti-reuse disposable syringe having an anti-rotation structure of a plunger, and particularly, when the injection liquid is injected into the human body, a pull rod (knob) inserted into the barrel in a baggy state of the syringe is reused for reuse purposes. The part and the push rod (the rear part of the plunger) are automatically cut so that the plunger and the push rod (the handle) are separated, so that it is not reusable, the drug can be injected into the human body as much as possible, and the loose rod prevents the inadvertent rotation in the barrel. The lower plate of the plunger connected and the lower portion of the gasket support for supporting the piston relates to a non-reusable disposable syringe having an anti-rotation structure of the plunger.

Disposable syringes are recognized as one-time use, but depending on the environment and region, there are problems that various diseases are transmitted or spread due to continuous use by the same person, divided use by drug addicts, or inevitable reuse in poor medical environment. have.

10 to 11 will be described in detail with respect to the "reusable disposable syringe" of the Republic of Korea (KR) Patent Publication No. 10-2005-0122061 (A) of the prior art.

Conventional anti-reusable syringe is composed of an outer cylinder (11) constituting the syringe barrel, and a plunger (21) connected to a narrow connection portion (41) by a piston (31) to which the gasket is coupled. 21 is inserted into the outer cylinder 11 of the syringe and assembled to complete the disposable syringe.

The push rod 21 connected to the piston by the thin connecting portion 41 has a pair of protrusions 42 inserted into the outer cylinder 11 to push the piston 31 when pushing the push rod to the left and right sides of the connecting portion 41. It is formed (symmetrically), and the protrusion 42 is formed with the piston and the clearance (interval) except when pushing the piston.

However, the piston 31 connected to the pusher 21 by the slender connection part 42 is provided with a gap between the protrusion 42, which causes a disadvantage that the piston is bent around the connection part 41.

In this way, when the piston 31 is bent, the connecting portion 41 is bent at an angle of θ so that an inadvertent force acts on the thin connecting portion 41 before assembly, for example, in the production process of the push rod or before the use of the push rod 41. The disadvantage is that the breaks are increased or folded.

In addition, in the process of assembling the push rod 21 in the outer cylinder 11, when the push rod is assembled loosely without contacting the inner wall 11, there is a disadvantage in that the rotation of the push rod is caused, resulting in poor assembly.

Furthermore, when there is only one connection part 41 and the friction force of the piston 31 is large, the strength of the connection part 41 when the pusher 21 is retracted in the outer cylinder 11 to suck the injection liquid into the syringe outer cylinder 11. Since the connection part 41 is broken because it is small, there was a disadvantage that it cannot be used at a desired time.

Therefore, the reuse-prevention disposable syringe of the prior art is a loose push rod 21 because the push rod 21 cannot prevent the push rod 21 from rotating inside the outer cylinder 11 when the push rod 21 is not in contact with the inner wall of the outer cylinder 11. ), A circular plate 24 in contact with the inner wall of the outer cylinder 11 was needed as a separate means to prevent the inner cylinder 11 from being rotated.

Therefore, even when the baggy rod 21 is in contact with the inner wall of the outer cylinder 11 by the circular plate 24, the circular plate 24 is like the piston 31 when the rod 21 is moved forward and backward in the outer cylinder 11. Since the abutment 21 is in contact with the inner wall 11, the pusher 21 is not bent around the connecting portion 41 (the "slack" pusher 21 here has an outer cylinder except for the circular plate 24 portion and the piston 31 portion). (11) means a straw that does not come into contact with the inner wall).

However, since the circular plate 24 and the inner wall of the outer wall 11 is in contact with the friction force is inevitably generated, the push rod 21 must be pushed by a force greater than the force pushing the loose push rod 21 by such friction force. In addition, even if the circular plate 24 has a disadvantage that the circular plate 24 is simply in contact with the inner wall 11 of the outer wall 11 so that rotation occurs in the circumferential direction.

Furthermore, before the push rod 21 is inserted into the outer cylinder 11 and assembled, the protrusion 42 and the connecting portion 41 are exposed to the outside, so that the piston 31 portion or the push rod 21 is θ angled around the interconnect portion. The disadvantages of bending were generated, and when the inadvertent force acting on the piston 31 or the pusher 21, the disadvantage of breaking the connection portion 41 was generated.

Therefore, there is a need for a non-reusable disposable syringe that does not bend the connecting portion between the rod 21 and the piston 31 and prevents the rotation of the rod.

KR, 10-2005-0122061 (A)

The present invention ensures that the handle (stack) inserted into the barrel loosely during use of the syringe is not completely rotated and the plunger is fully coupled to the barrel tip so that the drug is completely discharged into the syringe and the plunger is retracted when it is desired to be reused. When pulled into the protrusion of the plunger tip is fixed to the inside of the barrel tip while the plunger is to be easily separated to provide a reusable disposable syringe that is not reusable.

The present invention also aims to provide a reusable disposable syringe that protects the connection by preventing the connection from bending in the production process before the assembly.

The present invention forms a rectangular protrusion in the center of the lower plate formed at the end of the plunger adjacent to the gasket portion, and forms an insertion groove between the pair of rectangular protrusions on the corresponding gasket body surface, It is achieved by forming a connecting portion connected to the lower plate, while forming a locking portion such that the protrusion of the plunger leading end is locked inside the leading end of the barrel.

The present invention prevents the rotation of the plunger so that the drug injection operation of the syringe can be made accurately, and when the disposable syringe is to be reused, when the plunger is pulled backward, the plunger tip is caught in the lower tip of the barrel. Since it is fixed, the connection portion formed on the projection of the gasket portion is easily cut, so that the plunger is separated from the gasket, thereby preventing reuse of the disposable syringe, and the tip of the plunger is inserted into the tip of the barrel tip so that the drug is injected into the needle. It has the effect of completely discharging.

1 is an exploded perspective view of a syringe of a reusable disposable syringe having an anti-rotation structure of a plunger of the present invention.
Figure 2 is a perspective view showing the overall structure of FIG.
3 is an enlarged exploded perspective view showing the structure of the main part of FIG.
Figure 4 is an enlarged cross-sectional view showing the connection structure of the present invention when the plunger is pushed forward.
Figure 5 is an enlarged cross-sectional view showing that the connection of the present invention is cut when the plunger is pulled back.
Figure 6 is a cross-sectional view showing the overall state before use of the syringe of the present invention.
FIG. 7 is a cross-sectional view showing a state in which the injection needle cover is peeled off in FIG. 6 and the plunger is pushed toward the injection needle side of the front; FIG.
FIG. 8 is a cross-sectional view showing the connection of the plunger is cut off when the plunger is pulled backward in FIG. 7 to prevent reuse of the syringe;
Figure 9 is an illustration showing that the rectangular projection having a curved surface formed in the plunger of the present invention is inserted into the insertion groove (G) to suppress the rotation.
10 is an exemplary view showing that the projection of the prior art is rotated.
11 is a cross-sectional view showing the structure of the connecting portion and the projection of the prior art.
12 is a cross-sectional view showing that the prior art push rod and piston are bent around the connection before being assembled into the outer cylinder.

A tip configured at the barrel tip to engage the barrel, the tip of the plunger, a skirt configured concentrically on the outside of the tip to engage the needle holder, and a gasket at the front to be inserted into the barrel to discharge the drug into the injection needle, In the non-reusable disposable syringe having a anti-rotation structure of the plunger comprising a plunger inserted into the barrel in a loose state not to contact the barrel inner wall and a syringe needle holder coupled to the skirt, the handle being provided at the rear,

The plunger forms a lower plate adjacent to the gasket, and forms a rectangular protrusion in the center of the lower plate,

A pair of support protrusions are formed on the bottom of the gasket supporter facing the lower plate, and an insertion groove is formed between the support protrusions so that the rectangular protrusions of the plunger are inserted by the support protrusions.

Since the rectangular projection of the plunger is inserted between the insertion grooves, the side of the rectangular projection contacts the side of the insertion groove, so that the rotation angle of the plunger is limited in the insertion groove.

It is characterized in that both sides of the rectangular protrusion formed on the lower plate opposite to the pair of support protrusions of the gasket support body are connected by connecting portions, respectively.

The present invention configured as described above has a rectangular protrusion having a curved shape is inserted into the insertion groove to restrict the rotation angle of the plunger to prevent rotation, thereby preventing the rotation of the plunger as in the prior art barrel inner wall adjacent to the gasket. There is no need to add a circular plate to the plunger so that it contacts the.

The present invention is designed so that the gasket covers the rectangular protrusions, the support protrusions and the connecting portion and the bottom of the gasket elastically contacts the lower plate formed with the rectangular protrusions (see Fig. 4) so that the plunger is centered on the connecting portion before and after the barrel is inserted (barrel). It is designed not to be bent or broken before production process or use, and it can be used as a syringe without pressure and smoothly (because the plunger is not in contact with the inner wall of the barrel and is loose, so no friction occurs outside the gasket).

The present invention, unlike the prior art that forms the upper plate and the lower plate in the portion adjacent to the gasket of the plunger acting as a piston to effectively prevent the reuse of the disposable syringe and forming a connection portion in the upper plate and the lower plate, a pair of projections integrally on the gasket side A plunger and a gasket support are connected to both sides of the plunger and the gasket support by a connecting portion formed on the pair of protrusions while forming an insertion groove and forming a rectangular protrusion having a curved surface to protrude into the insertion groove between the pair of protrusions on the lower plate of the other side. It is characterized by.

In addition, a rounded protrusion and a locking jaw are formed at the tip of the plunger, and correspondingly, a locking part for suppressing the rear movement of the plunger is formed at the lower end of the barrel tip.

In addition, two or more threads are formed in the barrel skirt, and the projections of the syringe holder are screwed into the hub by threading, and then the projections of the syringe holder are reentered between the threads by an extension formed horizontally at the end of the threads. It is characterized by being configured to prevent the damage.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The non-reusable disposable syringe having the anti-rotation structure of the plunger of the present invention has a barrel 1 and a tip 2 and a skirt formed at the barrel tip and to which the plunger end and the injection needle 4 are coupled. skirt (3) and a gasket (6) is installed in front of the barrel (1) to discharge the drug to the injection needle, the handle (7) is provided in the back and is not loose in contact with the barrel inner wall It consists of a plunger 5 inserted into the furnace barrel 1 and an injection needle holder 4 coupled to the tip 2 and the skirt 3 portion. Here, the skirt 3 is a cylindrical outer cylinder to which the needle holder 4 is coupled, in which a small diameter cylindrical tip 2 is located concentrically inside.

In the plunger 5 to which the gasket 6 of the present invention is coupled, the gasket 6 includes a rectangular protrusion 14, a support protrusion 13, and a connecting portion 10 before the gasket 6 is assembled to the barrel 1. The cover plate is assembled so that the bottom surface of the gasket 6 is in elastic contact with the lower plate 12 on which the rectangular projections 14 are formed. Therefore, unlike the conventional plunger (stack) there is an advantage that the plunger 5 is not bent around the connecting portion 10 even before and after insertion of the barrel (1).

The plunger 5 inserted into the barrel 1 in a loose state without being in contact with the barrel inner wall is formed to be spaced apart from the gasket support 11 and the bottom plate 12 adjacent to the gasket 6 serving as a piston. The support 11 has a pair of support protrusions 13 and a lower plate rectangular protrusion 14 is inserted between the support protrusions 13 by the support protrusions 13 so as to push the gasket 6. G) is formed, and correspondingly, the lower plate 12 is formed with a rectangular protrusion 14 having a curved surface to be inserted into the insertion groove G to prevent rotation. Therefore, the plunger 5 does not rotate in the barrel 1 even when the plunger 5 is assembled in a loose state due to the coupling structure of the rectangular protrusion 14 and the insertion groove G. There is an advantage to avoid.

As schematically illustrated in FIG. 9, since such a rectangular protrusion 14 is extremely limited in the rotation angle β in the insertion groove G, the plunger 5 in which the rectangular protrusion 14 is formed is also known in the art. Unlike technology, rotation is very little suppressed.

This rectangular protrusion 14 may be formed into a rectangle having no curved surface. Here, the rectangular protrusion 14 is formed in a straight line on both sides of the side contact with the side of the insertion groove (G) as illustrated in the figure, the end portion connecting the straight portion is composed of a curved surface like a cylindrical gasket.

On the contrary, when the rectangular protrusions 14 inserted between the insertion grooves G are not rectangular but are formed in a circular shape, the plunger 5 inserted in the barrel 1 is prevented from rotating in a loose state so as not to contact the barrel inner wall. Can not.

The bottom surface of the insertion groove G and the upper surface of the rectangular protrusion 14 are adjacent to each other, and the support protrusions 13 on both sides of the insertion groove G are connected by the plunger lower plate 12 on the opposite side by the connection portion 10.

The rectangular protrusion 14 having a curved surface inserted between the pair of support protrusions 13 has a narrow left and right gap with the insertion groove G so that the plunger 5 inserted into the barrel 1 in a loose state is loosened. When rotated, the side of the rectangular protrusion 14 is in contact with the side of the insertion groove (G), the rotation is suppressed, there is an advantage that the plunger 5 is not completely rotated in the insertion groove (G) as in the prior art. (See FIG. 9)

To reuse the disposable syringe of the present invention configured as described above, the rear gasket of the plunger 5 inserted into the barrel 1 is pulled to the rear of the barrel in a state of being loose in contact with the inner wall of the barrel so that the gasket 6 has a barrel. (1) Since the frictional force generated by contacting the inner wall is large, both connection portions 10 of the gasket support 11 are cut, so that the handle 7 side of the plunger 5 and the gasket support 11 are separated, and the gasket 6 It is in the barrel 1 in the advanced state and serves to prevent reuse of the disposable syringe by allowing only the plunger 5 to be separated.

On the other hand, the plunger 5 inserted into the barrel 1 in a loose state without being in contact with the inner wall of the barrel has a round wedge-shaped protrusion 15 extending from the front end of the gasket 6 and correspondingly the tip of the barrel front end. (2) A locking portion 17 is formed inside the lower portion. The locking portion 17 inside the lower end of the tip 2 moves forward of the gasket 6 when the plunger 5 is retracted (when moving backward) after the protrusion 15 formed at the distal end of the plunger 5 is easily moved forward. It is preferable that the locking step 16 is formed of a plurality of elastic pieces 18 spaced apart in the circumferential direction so that the locking step 16 is prevented. Here, the elastic piece 18 is shown as three, but when the rear portion of the plunger 5 is coupled to the engaging jaw 16 of the plunger 5 to serve to accurately suppress the rear of the plunger 5 , Four, and the like. And the elastic piece 18 preferably has a curved shape to surround the circumference of the plunger. In addition, the end portion of the elastic piece 18 is formed in a wedge shape (male wedge shape) while the engaging jaw 16 of the plunger 5 to which the elastic piece 18 is coupled is also formed in a wedge shape (arm wedge shape). It is desirable to be.

Threads S1 and S2 are formed in the skirt 3 formed outside the tip 2 on which the front end of the plunger is engaged so that a conventional injection needle holder 4 is engaged. For example, a thread is formed from one point of the inner periphery of the skirt inlet, and another thread is formed in the same direction from a 180 degree point which is symmetrical to the point where the thread starts. Thus, when two threads S1 and S2 are formed in the same direction on the inner circumference of the skirt 3, a gap is formed between the threads, and as soon as the end of the thread passes under the opposite thread, the bottom surface of the thread ends horizontally. Extended extensions S1-1 are formed, respectively. In the figure the extension of the S2 thread is not shown. This extension part S1-1 narrows the space | interval between screw threads S1 and S2, On the contrary, when the injection needle holder 4 rotates, the projection 4-1 of the lower end of the injection needle holder 4 becomes a thread S1. , S2) to prevent reentry. Accordingly, when the needle holder 4 is inserted into the skirt 3 and rotated clockwise, for example, the projection 4-1 protruding from the lower end of the needle holder 4 has a thread S1 of the inner circumference of the skirt 3. S2 is entered into the skirt 3 to pass through the extension S1-1, and then the projection 4-1 of the injection needle holder 4 is idle in the skirt 3. However, since the interval between the threads is narrowed by the extension S1-1 of the threaded end of the skirt 3 and other extensions not shown, the projection 4-1 of the injection needle holder 4 is the skirt 3. It cannot be separated from.

The operating state of the present invention configured as described above will be described below.

The present invention aligns the needle holder (4) covered with the cap (C) to the skirt (3) to couple the injection needle (N) to the tip (2) and skirt (3) of the tip of the barrel (1) When the screw is rotated while being inserted, the projection 4-1 of the needle holder 4 is threadedly coupled with the threads S1 and S2 formed in the skirt 3 to be advanced into the skirt 3 and the thread S1. , S2) When the end of the extension (S1-1) passes the idling is made. At this time, even if the needle holder 4 is rotated in the opposite direction, the protrusions of the needle holder 4 are partially sealed because the gap between the thread extensions S1-1 and the not shown extensions partially seals the threads S1 and S2. The needle holder 4 cannot be separated from the skirt 3 because (4-1) cannot reenter the threads. Therefore, the needle N cannot be reused.

In this way, the needle holder 4 is assembled to the skirt 3 of the barrel 1, and the barrel plunger 5 is assembled to the barrel 1 in a loose state so as not to contact the barrel inner wall. When the plunger inserted into the barrel 1 is moved backwards in a loose state, the desired amount of the drug is sucked into the barrel 1, and then the outer handle 7 of the plunger 5 is pushed forward (in the barrel direction). It is injected into the patient's body through a syringe needle 4 coupled to the tip 2 and the skirt 3.

 At this time, the rectangular projection 14 of the lower plate 12 of the plunger 5 located adjacent to the tip 2 and the skirt 3 portion of the barrel 1 is in a state of pushing the gasket support 11. Further, when the handle 7 of the plunger 5 is further pushed by the barrel 1, the rounded wedge-shaped protrusion 15 pushes forward the locking portion 17 formed inside the tip 2 portion and is advanced. The locking portion 17 is formed of a plurality of elastic pieces 18 so that the protrusions 15 are elastically opened radially outward when the protrusions 15 pass and then return to the radially inner side when the protrusions 15 completely pass. At this time, the end portion of the elastic piece 18 is in a state of elastic contact with the lower portion of the plunger engaging jaw (16).

When the protrusion 15 at the tip of the plunger 5 is fully inserted into the locking portion 17 of the tip 2, the drug in the barrel 1 is completely discharged through the injection needle 4.

Then, when the handle 7 is pulled to the rear of the barrel to use the syringe again, the elastic piece 18 of the engaging portion 17 formed on the inside of the tip 2 of the barrel 1 is formed with the protrusion 15 of the plunger 5. ), The locking jaw 16 is caught and the movement to the rear of the barrel 1 is suppressed, and at the same time, the connection portion 10 connecting the gasket support 11 and the lower plate 12 is cut. Therefore, the plunger 5 inserted into the barrel 1 in a loose state without being in contact with the inner wall of the barrel is separated from the gasket 6 part to prevent reuse of the syringe.

The present invention is applicable to a disposable syringe which is connected to the piston part and the connection part to prevent reuse of the syringe so that the connection part is broken when the piston is retracted.

1: barrel 2: tip 3: skirt
4: injection needle holder 5: plunger 6: gasket
7: handle 10: connection portion 11: gasket support
12: lower plate 13: support protrusion 14: lower plate protrusion
15: projection 16: locking jaw 17: locking
18: Elastic pieces S1, S2: Thread S1-1: Extension part
C: (Injection Needle Holder) Cap G: Insertion Groove

Claims (2)

A tip (2) configured at the barrel tip to engage the barrel (1), a tip of the plunger (5), a skirt (3) configured concentrically on the outside of the tip (2) to engage the needle holder (4), and The plunger inserted into the barrel 1 is inserted into the barrel 1 so that the gasket 6 is installed in front of the barrel 1 and the handle 7 is provided in the rear to release the drug into the needle. (5) and an anti-reuse disposable syringe having an anti-rotation structure of a plunger composed of an injection needle holder (4) coupled to a skirt (3),
The plunger 5 forms a lower plate 12 adjacent to the gasket 6, and forms a rectangular protrusion 14 in the center of the lower plate,
A pair of support protrusions 13 are formed on the bottom face of the gasket support 11 facing the lower plate 12, and the support protrusions 13 allow the rectangular protrusions 14 of the plunger 5 to be inserted by the support protrusions 13. 13) an insertion groove (G) is formed between,
A rectangular protrusion 14 of the plunger 5 is inserted between the insertion grooves G so that the side surface of the rectangular protrusion contacts the side of the insertion groove G so that the plunger 5 rotates in the insertion groove G. β) is limited,
Both sides of the rectangular protrusions 14 formed on the lower plate 12 on the opposite side of the pair of support protrusions 13 of the gasket support 11 are connected to the connecting portions 10, respectively. Resistant disposable syringe. delete
KR2020100006874U 2010-06-29 2010-06-29 Reusable disposable syringe with anti-rotation structure of plunger KR200451044Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2020100006874U KR200451044Y1 (en) 2010-06-29 2010-06-29 Reusable disposable syringe with anti-rotation structure of plunger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2020100006874U KR200451044Y1 (en) 2010-06-29 2010-06-29 Reusable disposable syringe with anti-rotation structure of plunger

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4023273A1 (en) 2020-12-29 2022-07-06 PoongLim Pharmatech Inc Syringe with plunger reaction pressure reduction structure
US11433185B2 (en) 2018-09-24 2022-09-06 Norton Healthcare Limited Injection device
US11529472B2 (en) 2018-09-24 2022-12-20 Norton Healthcare Limited Injection device
KR102608679B1 (en) 2023-04-14 2023-12-01 (주)풍림파마텍 Syringe having pressure reduction structure plunger

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JP2006272009A (en) 2006-07-13 2006-10-12 Nihon Medi Physics Co Ltd Injector and method for attaching and detaching gasket to and from plunger in injector
US20100057014A1 (en) 2006-11-16 2010-03-04 CANE' S.P.A. -Socio Unico Syringe plunger and syringe incorporating the plunger

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JP2006272009A (en) 2006-07-13 2006-10-12 Nihon Medi Physics Co Ltd Injector and method for attaching and detaching gasket to and from plunger in injector
US20100057014A1 (en) 2006-11-16 2010-03-04 CANE' S.P.A. -Socio Unico Syringe plunger and syringe incorporating the plunger

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11433185B2 (en) 2018-09-24 2022-09-06 Norton Healthcare Limited Injection device
US11529472B2 (en) 2018-09-24 2022-12-20 Norton Healthcare Limited Injection device
EP4023273A1 (en) 2020-12-29 2022-07-06 PoongLim Pharmatech Inc Syringe with plunger reaction pressure reduction structure
US11752270B2 (en) 2020-12-29 2023-09-12 Poonglim Pharmatech Inc. Syringe with plunger reaction pressure reduction structure
KR102608679B1 (en) 2023-04-14 2023-12-01 (주)풍림파마텍 Syringe having pressure reduction structure plunger

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