JP4137889B2 - Syringe - Google Patents

Description

  The present invention relates to a syringe that can be separated and discarded after use.

  In a syringe (syringe) provided with an injection needle and a barrel, it may be required to separate and discard the injection needle and the barrel after use. Conventionally, the user attaches an injection needle to the luer taper part provided at the front end of the barrel to perform injection, blood collection, etc., and then the user removes the injection needle from the luer taper part with the needle base of the injection needle. Was separated and discarded.

  On the other hand, in Patent Document 1 below, as a syringe for performing such separation and disposal, a syringe set including a barrel with a built-in plunger and an assembly of injection needles housed in a cylindrical protector separately from the barrel. Is disclosed. The protector has a length that allows the injection needle to be housed therein, and is formed to have a diameter slightly larger than the outer diameter of the barrel so that the outer periphery of the barrel can be covered. The injection needle includes a needle tube and a needle base, and the needle base is formed in a disc shape having an outer diameter substantially the same as the inner diameter of the protector.

  The injection needle is fitted in the protector so as to be slidable in the axial direction, and is positioned at the rear end (the side on which the barrel is mounted) of the protector before use. A detachable cap is mounted in front of the protector. The luer taper portion of the barrel is provided with a male screw portion on the outer peripheral surface. An internal thread portion is also provided on the inner peripheral surface of the needle base of the injection needle so as to be screwed into the external thread portion of the luer taper portion.

  When using the syringe set disclosed in Patent Document 1, hold the barrel and the assembly of the injection needle with both hands, and screw the needle base of the injection needle onto the luer taper portion of the barrel. Next, the cap attached to the protector is removed, and the protector is moved toward the barrel so as to cover the outer periphery of the barrel. Accordingly, the injection needle is relatively moved to the front end portion of the protector, and the injection needle protrudes from the front end portion of the protector. Thereafter, injection, blood collection, etc. are performed in the same manner as a normal syringe.

  However, a normal syringe can be used by simply attaching an injection needle with a cap attached to the barrel before use and then removing the cap. On the other hand, in the syringe set disclosed in Patent Literature 1, it is necessary to hold the protector before using the syringe and attach the injection needle to the barrel, remove the protector cap, or move the protector in the direction of the barrel. It becomes. In this case, the syringe preparation work is too complicated in a medical site that requires quick work, and thus cannot be put into practical use.

  In addition, since the work of moving the protector in the direction of the barrel is a heterogeneous work that has not been performed in the conventional medical field, there is a possibility that a false puncture or the like may occur when the injection needle is exposed due to an unfamiliar work. In addition, it is difficult to work with a small diameter luer taper portion having a larger diameter protector than the barrel. As described above, the syringe set disclosed in Patent Document 1 is complicated in preparation work before use, and is not practical in an actual medical field, and is liable to cause work errors due to complicated work. There is an inconvenience.

The syringe set disclosed in Patent Document 1 has a special shape that must be formed so that the needle base of the injection needle is slidably fitted to the inner periphery of the protector. Therefore, since a general-purpose injection needle that is generally used cannot be used, there is a problem in terms of cost.
JP-T-3-505289 (Specification, page 3, lower right column to page 4, upper left column, FIGS. 1 to 10)

  The present invention aims to improve the syringe, and more specifically, to eliminate the inconvenience, it can be used without requiring a complicated operation, and the barrel and the injection needle are safely separated and discarded. Furthermore, it aims at providing the syringe which can use a general purpose injection needle.

  In order to achieve the above object, the syringe of the present invention is a syringe to which an injection needle can be attached, and includes a barrel, and the needle base of the injection needle is fitted on the front end of the barrel with the axial direction of the barrel as the front-rear direction. A cylindrical protector having a free luer taper portion, which is externally provided with an interval on the outer periphery of the barrel, and has a locking portion protruding inward toward the outer peripheral surface of the barrel at the rear end portion; A cylindrical body portion interposed between the barrel and the protector and movable in the front-rear direction with respect to the protector, and positioned and held near the front end portion of the barrel, and extends forward from the body portion. A hook having a claw portion projecting inwardly at a front end portion, and a push-out portion projecting inwardly from the trunk portion, and the claw portion and the push-out portion are disposed behind the needle base. The flange formed on the outer periphery of the end is sandwiched from the front and back A needle holder for holding the injection needle, and when the protector is moved forward with respect to the barrel, the locking portion comes into contact with the rear end surface of the body portion of the needle holder, and the needle The protector is configured to be separated from the front of the barrel together with the holder, and the length of the protector is held by the needle holder and the needle holder in a state where the locking portion is in contact with the rear end surface of the body portion of the needle holder. It is set to the length which can accommodate the injection needle to be stored inside.

  In the syringe of the present invention, when the injection needle is mounted, the needle base is externally fitted to the luer taper portion and is sandwiched between the push-out portion and the claw portion of the needle holder. Completed state. As described above, in the syringe of the present invention, the preparation for use is completed only by attaching the injection needle to the luer taper portion of the barrel, so that it is the same as the preparation work for a general syringe, and can be used in the medical field without any sense of incongruity. can do.

  In the syringe of the present invention, when the user attaches the needle base of the injection needle to the luer taper portion of the barrel, the hook portion of the needle base is sandwiched between the pushing portion of the needle holder and the hook claw portion. When the user moves the protector forward with respect to the barrel, the needle holder is movable with respect to the protector and is positioned and held near the front end of the barrel. Only the protector moves forward with respect to the barrel while being held at the front end portion of the. And the latching | locking part provided in the rear-end part of the protector contact | abuts to the rear-end part of the said needle holder.

  When the protector is further moved in front of the barrel from this state, the needle holder is detached forward from the vicinity of the front end portion of the barrel. At this time, the rear end portion of the needle base of the injection needle contacts and pushes out the pushing portion of the needle holder, so that the needle base is detached from the luer taper portion while being held by the needle holder. Thereby, the injection needle is removed from the barrel, and the injection needle is held by the needle holder and accommodated in the protector.

  Thus, in the syringe of the present invention, the barrel and the injection needle can be separated and discarded after use. At this time, since the user only has to move the protector to the front of the barrel, it is not necessary to have the needle base of the injection needle as in the conventional general syringe, so the injection needle from the barrel is easier than the conventional syringe. Can be removed. Further, in the syringe of the present invention, since the injection needle is accommodated in the protector at the time of separation, no puncture or the like occurs when the user discards them.

  Incidentally, the injection needle attached to the syringe of the present invention needs to have a collar at the rear end of the needle base, but a general-purpose injection needle generally used has a normal needle base. A collar portion is provided on the outer peripheral portion. For this reason, a general-purpose injection needle can be used in the syringe of the present invention.

  Further, in the syringe of the present invention, the outer periphery of the barrel is tapered so that the diameter is gradually reduced toward the front, and the locking portion of the protector is the same as or slightly the outer diameter of the rear end portion of the outer periphery of the barrel. It is preferable that it is formed in a small diameter and fitted to the outer periphery of the rear end of the barrel. According to this, when the protector is mounted on the barrel, since the locking portion is fitted to the outer peripheral portion of the barrel, the protector does not accidentally come off from the barrel. Further, when the protector is moved to the front of the barrel, the engagement between the locking portion and the outer periphery of the barrel is released, so that the protector can be easily moved. In addition, the rear end part of the barrel into which the locking part is fitted is a concept including the rear end part and the vicinity thereof.

Moreover, in the syringe of the present invention, the rear end portion of the barrel has a protruding portion that protrudes outward, and the protector has a hooking portion that is releasably hooked on the protruding portion. Is preferred. According to this, when the protector is attached to the barrel, the protector is securely fixed to the barrel by the latching portion, so that the protector is not inadvertently detached from the barrel.

Further, in the syringe of the present invention, the needle holder is provided with irregularities extending in the front-rear direction on the outer periphery of the barrel portion, and the convex portions of the irregularities are in contact with the inner peripheral surface of the protector. Preferably it is. According to this, since the frictional resistance between the protector and the needle holder is reduced when the protector is moved in front of the barrel, the protector can be operated with a light force.

  Next, an example of an embodiment of the syringe of the present invention will be described with reference to FIGS. 1 to 5. The syringe 1 of this embodiment is provided with the barrel 2, the protector 3 which covers the outer side of the barrel 2, and the needle holder 4 attached to the front-end part of the barrel 2, as shown in FIG. 1, 3, 4, and 5, the protector 3, the needle holder 4, and the cap 20 of the injection needle 16, which will be described later, are broken in half vertically.

  As the barrel 2 in this embodiment, a general-purpose product that is generally widely used as shown in FIG. 1 is used. As shown in FIG. 1, the configuration includes a barrel body 5, a luer taper portion 6 provided at the front end portion of the barrel body 5, and a finger hook portion 7 provided at the rear end portion of the barrel body 5. These are integrally formed of a transparent synthetic resin. As shown in FIG. 1, the barrel body 5 has a cylindrical shape, and the inner periphery thereof has the same diameter in the front-rear direction, but the outer periphery has a tapered shape that gradually decreases in diameter toward the front. As shown in FIG. 1, the luer taper portion 6 has a cylindrical shape and is gradually reduced in diameter toward the front. In addition, as shown in FIG. 1, a plunger 8 slidable in the barrel body 5 in the front-rear direction is mounted inside the barrel 2.

  The protector 3 is formed of a transparent synthetic resin, is substantially cylindrical as shown in FIG. 2 a, has a length that is substantially the same as the barrel body 5, and has an inner diameter that is slightly larger than the outer diameter of the barrel body 5. Large diameter. In addition, the rear end portion of the protector 3 is a locking portion 9 that has a diameter that is slightly smaller than the outer diameter of the rear end portion of the barrel body 5.

As shown in FIG. 2 b, the needle holder 4 has a cylindrical body portion 10, a plate-like push-out portion 11 provided at the front end portion of the body portion 10, and four front positions on the outer periphery of the front end portion of the body portion 10. And a hook 12 protruding from the top. Further, a claw portion 13 protruding inward is provided at the front end portion of the hook 12. Further, a protrusion (convex portion) 14 is provided in the axial direction around the trunk portion 10 where the hook 12 is provided. The body portion 10 has an inner diameter that is substantially the same as the outer diameter in the vicinity of the front end of the barrel body 5, and the outer diameter is slightly smaller than the inner diameter of the protector 3. Further, the length in the radial direction of the portion of the trunk 10 where the protrusions 14 are provided is formed to be substantially the same as the inner diameter of the protector 3. Further, a through hole 15 penetrating in the front-rear direction is provided in the central portion of the extruded portion 11. The inner diameter of the through hole 15 is slightly larger than the maximum diameter of the luer taper portion 6 of the barrel 2 and is smaller than the outer diameter of the rear end portion of the needle base 17 of the injection needle 16 described later.

  As shown in FIG. 1, the injection needle 16 is generally widely used and includes a needle base 17 made of synthetic resin and a needle tube 18 made of stainless steel extending in front of the needle base 17. Yes. The needle base 17 is a substantially cylindrical member having a reduced diameter toward the front, and an inner peripheral surface thereof is fitted to the luer taper portion 6 of the barrel 2. Further, a collar portion 19 protruding in the outer peripheral direction is provided at the rear end portion of the needle base 17. Further, the injection needle 16 is provided with a cap 20 for protecting the needle tube 18 and preventing erroneous piercing.

  In the syringe 1 of the present embodiment, the protector 3 is mounted so as to cover the entire barrel main body 5, and the needle holder 4 is inserted in the interval generated between the protector 3 and the barrel main body 5. Prior to use, the needle holder 4 is positioned and held near the front end of the barrel body 5 as shown in FIG. Since the pushing portion 11 of the needle holder 4 is in contact with the front end portion of the barrel body 5, it does not enter the barrel body 5 and the protector 3 even when a force is applied to the hook 12 from the outside. In the protector 3, the engaging portion 9 is fitted to the outer peripheral portion of the barrel body 5 at the rear end portion, and is in contact with the protrusion 14 of the needle holder 4 on the inner peripheral surface in the vicinity of the front end portion. Thus, the gap is provided by the protrusion 14 of the needle holder 4 between the inner peripheral surface of the protector 3 and the outer peripheral surface of the needle holder 4, and is formed between the protector 3 and the barrel body 5. The space communicates with the outside through the space.

  Next, the usage method of the syringe 1 of this embodiment is demonstrated with reference to FIG.1 and FIG.3. When using the syringe 1 of the present embodiment, the user attaches the syringe needle 16 with the cap 20 attached thereto as shown in FIG. Specifically, the needle base 17 of the injection needle 16 is attached to the luer taper portion 6 of the barrel 2. At this time, the collar portion 19 of the needle base 17 pushes and spreads the four hooks 12 of the needle holder 4 to move further backward, and as shown in FIG. 3, the push-out portion 11 of the needle holder 4 and the claw of the hook 12 It is held at a position between the unit 13. When the user removes the cap 20 from the injection needle 16 from this state, it can be used as a normal syringe 1. At this time, the protector 3 is not inadvertently detached from the barrel 2 because the inner peripheral surface of the locking portion 9 is fitted to the outer periphery of the rear end portion of the barrel body 5.

  Next, a method for discarding the syringe 1 of this embodiment after use will be described with reference to FIGS. After use of the syringe 1, it is in the state shown in FIG. From this state, the user holds the finger-holding portion 7 of the barrel 2 with one hand and the protector 3 with the other hand, and moves them in directions away from each other. In the protector 3, the inner peripheral surface of the locking portion 9 is fitted to the outer periphery of the rear end portion of the barrel body 5, but the outer periphery of the barrel body 5 is gradually reduced in diameter toward the front. For this reason, when the protector 3 is moved forward, a little force is required to release the fitting. After that, the locking portion 9 is loosely fitted with the barrel body 5, so that the protector 3 can be easily moved. Can be moved.

  At this time, the needle holder 4 remains held in the vicinity of the front end portion of the barrel 2, and only the protector 3 is pushed forward with respect to the barrel 2. Then, as shown in FIG. 4, when the protector 3 is moved until the locking portion 9 of the protector 3 comes into contact with the rear end portion of the needle holder 4, the injection needle 16 and the needle holder 4 are accommodated in the protector 3. Then, the periphery of the needle tube 18 of the injection needle 16 is covered by the protector 3.

  When the protector 3 is further moved forward from this state, the needle holder 4 is pushed forward by the locking portion 9 of the protector 3 as shown in FIG. When the needle holder 4 is pushed forward in this way, the pushing portion 11 of the needle holder 4 comes into contact with the rear end portion of the needle base 17 of the injection needle 16 and pushes out the injection needle 16, so that the injection needle 16 has a luer taper portion 6. Leave. When the injection needle 16 is detached from the luer taper portion 6, the collar portion 19 of the needle base 17 is held between the pushing portion 11 of the needle holder 4 and the claw portion 13 of the hook 12. Absent. For this reason, the injection needle 16 is held in the protector 3 together with the needle holder 4.

  Thus, according to the syringe 1 of this embodiment, it is only necessary to attach the injection needle 16 to the syringe 1 at the time of use like the conventional syringe and injection needle. Further, after use, the barrel 2 and the injection needle 16 can be separated and discarded simply by pushing the protector 3 out of the barrel 2. Moreover, since the injection needle 16 is accommodated in the protector 3 and the front end portion of the needle tube 18 is covered with the protector 3 at the time of disposal, there is no possibility that the needle tube 18 may be erroneously punctured after the injection needle 16 is separated from the barrel 2. .

  In this embodiment, since the latching | locking part 9 of the protector 3 is formed over the perimeter of the protector 3, the protector 3 contact | abuts to the outer periphery of the barrel main body 5, and is hold | maintained stably. On the other hand, in the case of such a configuration, if the airtightness among the protector 3, the needle holder 4 and the barrel body 5 is high, when the protector 3 is moved forward of the barrel 2, the protector 3 and the barrel body 5 The air in the gap is compressed. Therefore, when the protector 3 is moved quickly, there is a possibility that the protector 3 becomes resistant to the compression of the air.

  However, in this embodiment, a protrusion 14 extending in the front-rear direction is provided on the outer peripheral portion of the needle holder 4, and a space between the protector 3 and the barrel body 5 communicates with the outside by a gap generated by the protrusion 14. Yes. For this reason, even if the protector 3 is moved quickly, the air between the protector 3 and the barrel main body 5 is pushed out from the gap formed by the ridges 14, so that the resistance of the protector 3 does not move.

  In addition, the syringe set described in the background art includes not only a barrel and a plunger, but also an injection needle assembly that is approximately the same size as the barrel, so that it is bulkier than a syringe set including a general-purpose barrel and injection needle. There is an inconvenience of stretching. However, in the case of the syringe 1 according to the present embodiment, the protector 3 is attached to the outside of the barrel body 5 before use, and is approximately the same size as a general-purpose syringe. Absent.

  In the above embodiment, the locking portion 9 is provided on the entire circumference along the inner circumference of the protector 3. However, the present invention is not limited to this, and a part may protrude from the inner circumference of the protector 3. Moreover, in the said embodiment, although the collar part 19 of the injection needle 16 is hold | maintained with a certain amount of play between the extrusion part 11 of the needle holder 4, and the hook 12, it does not restrict to this but the extrusion part 11 and a hook 12 may be held without having any play.

Moreover, although the protector 3 is formed with the synthetic resin, you may form not only this but with glass. Further, the barrel 2 may be a glass barrel. Moreover, in the said embodiment, although the protrusion 14 is provided in the outer periphery of the needle holder 4 and the frictional resistance between the protector 3 and the needle holder 4 is reduced, the space in the protector 3 and the exterior are connected, Not only this but the groove | channel (recessed part) extended in the front-back direction may be provided in the outer periphery of the needle holder 4. FIG. The effect similar to the protrusion 14 can be obtained also by such a groove | channel.

  Next, a second embodiment of the syringe of the present invention will be described with reference to FIG. In the syringe 1 ′ of the second embodiment, as shown in FIG. 6A, a latching portion 21 that protrudes rearward is provided at the rear end portion of the protector 3 ′. A claw portion 22 that protrudes inward is provided at the rear end portion of the latch portion 21. Moreover, the barrel 2 has the same configuration as that of the above embodiment, and as shown in FIG. 1, the finger-hanging portion (projecting portion) 7 has an elliptical shape with a large diameter in the vertical direction and a small diameter in the left-right direction. Yes. Moreover, in 2nd Embodiment, the internal diameter of the latching | locking part 9 of the protector 3 'is formed in the same diameter as the outer diameter of the rear-end part outer periphery of the barrel main body 5. FIG. In addition, about the structure similar to the said embodiment, the code | symbol similar to the said embodiment is attached | subjected in FIG. 6, and detailed description is abbreviate | omitted.

  Since the protector 3 ′ of the second embodiment has the above-described configuration, when the protector 3 ′ is attached to the barrel 2, the claw portions 22 are formed from both sides of the small diameter portion of the finger hook portion 7 of the barrel 2 as shown in FIG. Put it in. Accordingly, the protector 3 ′ is hooked on the finger hooking portion 7 of the barrel 2 by the claw portion 22 of the hooking portion 21.

  Therefore, when the syringe 1 ′ is used, the protector 3 ′ is hooked on the barrel 2 by the hooking portion 21, so that it does not accidentally come off the barrel 2. Also, when disposing of the syringe 1 ′ after use, as in the above embodiment, the user holds the finger-holding portion 7 of the barrel 2 with one hand and the protector 3 ′ with the other hand. Move them away from each other. The protector 3 ′ is hooked on the barrel 2 by the hooking portion 21, but if the protector 3 ′ is moved to the front of the barrel 2 with a certain amount of force, the claw portion 22 is detached from the finger hooking portion 7 and hooked. The latching of the part 21 is released. Thereafter, the protector 3 ′ is removed from the barrel 2 in the same manner as in the above embodiment, whereby the injection needle 16 and the needle holder 4 are accommodated in the protector 3, and the periphery of the needle tube 18 of the injection needle 16 is covered by the protector 3. It is possible to dispose of it in the state where

  In addition, in 2nd Embodiment, although the internal diameter of the latching | locking part 9 of protector 3 'is made substantially the same as the outer diameter of the barrel main body 5, not only this but the internal diameter of the latching | locking part 9 is made into the barrel main body 5. The diameter may be slightly smaller than the outer diameter. Moreover, although the latching | locking part 21 is comprised so that it may be latched by a part of finger hook part 7, it is not restricted to this, The groove | channel etc. which cover the whole finger hook part 7 and are latched by the outer periphery It is good also as a structure which has. Moreover, although the latching | locking part 21 is comprised integrally with the protector 3 ', it is not restricted to this, You may latch the finger-hanging part 7 on the protector 3' with another member.

The partial cross section figure which shows the state before an injection needle is mounted | worn about the syringe which is an example of embodiment of this invention. Explanatory drawing which shows the structure of the main components of the syringe of this embodiment. Explanatory drawing which shows the state which mounted | wore the syringe needle of this embodiment with the injection needle. Explanatory drawing which shows the state in the middle of discarding an injection needle after use of the syringe of this embodiment. Explanatory drawing which shows the state which isolate | separated the barrel and the injection needle at the time of disposal in the syringe of this embodiment. Explanatory drawing which shows the structure of the syringe of 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1 '... Syringe, 2 ... Barrel, 3,3' ... Protector, 4 ... Needle holder, 6 ... Luer taper part, 9 ... Locking part, 10 ... Trunk part, 11 ... Extrusion part, 12 ... Hook, 13 ... Nail | claw part, 16 ... injection needle, 17 ... needle base, 18 ... needle tube, 19 ... buttocks.

Claims (4)

A syringe to which an injection needle can be attached, comprising a barrel, having an axial direction of the barrel in the front-rear direction, and having a luer taper part that allows the needle base of the injection needle to be fitted on the front end of the barrel,
A cylindrical protector having a latching portion which is externally provided with an interval on the outer periphery of the barrel and protrudes inward toward the outer peripheral surface of the barrel at the rear end portion
A cylindrical body portion interposed between the barrel and the protector and movable in the front-rear direction with respect to the protector, and positioned and held near the front end portion of the barrel, and extends forward from the body portion. A hook having a claw portion projecting inwardly at a front end portion, and a push-out portion projecting inwardly from the trunk portion, and the claw portion and the push-out portion are disposed behind the needle base. A needle holder for holding the injection needle so as to sandwich the collar formed on the outer periphery of the end from the front and back,
When the protector is moved forward with respect to the barrel, the locking portion is configured to come into contact with the rear end surface of the body portion of the needle holder and to be detached together with the needle holder to the front of the barrel; The length of the protector is set to a length capable of accommodating the needle holder and the injection needle held by the needle holder in a state where the locking portion is in contact with the back end surface of the body portion of the needle holder. A syringe characterized by being. The outer periphery of the barrel has a tapered shape that is gradually reduced in diameter toward the front,
The syringe according to claim 1, wherein the locking portion of the protector is formed to have the same or slightly smaller outer diameter of the rear end portion of the outer periphery of the barrel and is fitted to the outer periphery of the rear end portion of the barrel. Having a protruding portion protruding outward at the rear end of the barrel;
The syringe according to claim 1 or 2, wherein the protector has a latching portion that is releasably latched on the projecting portion. It said needle holder, according to claim 1, characterized in that the body portion outer peripheral uneven which extends toward the front-rear direction is provided on the convex portion of the unevenness is in contact with the inner peripheral surface of the protector , 2 or 3.

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