JP5459204B2 - Syringe - Google Patents

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JP5459204B2
JP5459204B2 JP2010508115A JP2010508115A JP5459204B2 JP 5459204 B2 JP5459204 B2 JP 5459204B2 JP 2010508115 A JP2010508115 A JP 2010508115A JP 2010508115 A JP2010508115 A JP 2010508115A JP 5459204 B2 JP5459204 B2 JP 5459204B2
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gasket
barrel
annular protrusion
peripheral surface
plunger
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JPWO2009128265A1 (en
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康宏 村松
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Ajinomoto Co Inc
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Ajinomoto Co Inc
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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
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M5/31513—Piston constructions to improve sealing or sliding
    • 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
    • A61M2005/3103—Leak prevention means for distal end of syringes, i.e. syringe end for mounting a needle
    • A61M2005/3106—Plugs for syringes without 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
    • A61M5/315—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
    • A61M5/31515—Connection of piston with piston rod

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

Description

本発明は液体を注入するバレルと、バレル内に注入された液体を押し出すプランジャと、プランジャの先端部に取り付けられるガスケットと、を具備したシリンジに関する。   The present invention relates to a syringe provided with a barrel for injecting liquid, a plunger for pushing out the liquid injected into the barrel, and a gasket attached to the tip of the plunger.

体内に薬液等の液体を注入する場合にシリンジが使用されている。シリンジは液体を注入するバレルと、バレル内に注入された液体を押し出すプランジャと、プランジャの先端部に取り付けられるガスケットと、を具備することによって構成されている。また、前記プランジャの先端部には前記ガスケットを取り付けるための雄ネジ部が形成されており、前記ガスケットの内周面には前記雄ネジ部と螺合する雌ネジ部が刻設されている。尚、前記ガスケットは前記バレルの内周面と摺接する部材で、円滑な摺動性と、優れた液密性ないし気密性とが要求される部材になっている。そして、前記ガスケットの摺動性と、液密性ないし気密性にはガスケットの反発力を増減させる要因としてガスケットの天面部寄りの第１環状突部における内方空間の構造が深く関係している。   A syringe is used for injecting a liquid such as a chemical into the body. The syringe includes a barrel that injects liquid, a plunger that pushes out the liquid injected into the barrel, and a gasket that is attached to the tip of the plunger. Further, a male screw part for attaching the gasket is formed at the tip part of the plunger, and a female screw part screwed with the male screw part is engraved on the inner peripheral surface of the gasket. The gasket is a member that is in sliding contact with the inner peripheral surface of the barrel, and is a member that requires smooth slidability and excellent liquid tightness or air tightness. The sliding property of the gasket and the liquid-tightness or airtightness are closely related to the structure of the inner space in the first annular projection near the top surface of the gasket as a factor to increase or decrease the repulsive force of the gasket. .

前記ガスケットの構成に特徴を有するシリンジの従来技術として下記の特許文献１、２に開示されているシリンジが挙げられる。このうち、特許文献１ではガスケットの材質にバレルの材質として使用されている硬質樹脂材料を適用するとともに、ガスケットの外径と鍔部の肉厚とを調整することによってガスケットに所望の摺動性と、液密性ないし気密性とに加えて耐薬品性を付与するようにしている。
一方、特許文献２ではガスケットの外周面に摺動性付与成分と柔軟性付与成分とを含有した被膜を形成し、更に該被膜の表面に微粒子を設けて粗面に形成したガスケットの構成が開示されている。そして、このような構成のガスケットによれば、ガスケットの摺動面に潤滑剤を付与しなくても安定した摺動性を得ることができる旨、記載されている。 Syringes disclosed in the following Patent Documents 1 and 2 can be cited as conventional techniques for syringes characterized by the structure of the gasket. Among these, in Patent Document 1, a hard resin material used as a barrel material is applied to the gasket material, and a desired slidability is applied to the gasket by adjusting the outer diameter of the gasket and the thickness of the collar portion. In addition to liquid tightness or air tightness, chemical resistance is imparted.
On the other hand, Patent Document 2 discloses a configuration of a gasket in which a coating containing a slidability-imparting component and a flexibility-imparting component is formed on the outer peripheral surface of the gasket, and fine particles are provided on the surface of the coating to form a rough surface. Has been. And it is described that according to the gasket of such a structure, stable slidability can be obtained without applying a lubricant to the sliding surface of the gasket.

特開２００３−１８０８３２号公報JP 2003-180832 A 特開２００６−１６７１１０号公報JP 2006-167110 A

前記従来のシリンジによると次のような問題があった。
例えば、ガスケットの天面部寄りの第１環状突部の内方を充実体によって構成すればガスケットのゴム反発力が大きくなり過ぎ、摺動抵抗が大きくなって所望のガスケットの摺動性が得られなくなってしまう。
一方、ガスケットの天面部寄りの第１環状突部の内方を刳り抜いて大きな空間部を形成した場合にはガスケットの第１環状突部での変形量が増大し、所望のガスケットの液密性ないし気密性が得られなくなってしまう。 The conventional syringe has the following problems.
For example, if the inner side of the first annular projection near the top surface of the gasket is formed of a solid body, the rubber repulsive force of the gasket becomes too large, and the sliding resistance increases and the desired slidability of the gasket is obtained. It will disappear.
On the other hand, when a large space is formed by punching the inside of the first annular projection near the top surface of the gasket, the amount of deformation at the first annular projection of the gasket increases, and the desired liquid-tightness of the gasket is increased. Sex or airtightness cannot be obtained.

本発明はこのような点に基づいてなされたものでその目的とするところは、ガスケットの形状とプランジャの先端部の形状を一部改変するだけの極めて簡単な構成によって現行品を上回るガスケットの円滑な摺動性と、優れた液密性ないし気密性を得ることができるシリンジを提供することにある。   The present invention has been made on the basis of these points, and the object of the present invention is to achieve a smoother gasket than the current product by an extremely simple configuration in which the shape of the gasket and the shape of the tip of the plunger are partially modified. An object of the present invention is to provide a syringe capable of obtaining excellent slidability and excellent liquid tightness or air tightness.

前記目的を達成するべく本発明の請求項１によるシリンジは、 液体を注入するバレルと、バレル内に注入された液体を押し出すプランジャと、プランジャの先端部に取り付けられるガスケットと、を具備したシリンジにおいて、
前記プランジャの先端部には前記ガスケットを取り付けるための雄ネジ部と、前記ガスケットの天面部の内壁面に当接してガスケットを支持する前記雄ネジ部の谷径よりも小径の支持凸部とが設けられており、
前記ガスケットの内方空間には内周面に前記雄ネジ部と螺合する雌ネジ部が刻設され、天面部に前記支持凸部を受け入れる前記雌ネジ部の内径よりも小径の受入れ凹部が設けられており、
前記ガスケットの外周面には天面部寄りの位置に前記バレルの内周面と摺接する第１環状突部が設けられており、
前記受入れ凹部は前記第１環状突部が設けられている部位に対応した前記ガスケットの内方空間に設けられており、
前記ガスケットの外周面には開放された裾部側の位置に前記バレルの内周面と摺接する第３環状突部が設けられており、前記第３環状突部と前記第１環状突部の中間空間に前記バレルの内周面と摺接する第２環状突部が設けられていることを特徴とするものである。 To achieve the above object, a syringe according to claim 1 of the present invention is a syringe comprising a barrel for injecting liquid, a plunger for pushing out the liquid injected into the barrel, and a gasket attached to the tip of the plunger. ,
A male screw part for attaching the gasket to the tip of the plunger, and a support convex part having a diameter smaller than the valley diameter of the male screw part that contacts the inner wall surface of the top surface part of the gasket and supports the gasket. Provided,
In the inner space of the gasket, a female screw portion that is screwed with the male screw portion is formed on the inner peripheral surface, and a receiving recess having a smaller diameter than the inner diameter of the female screw portion that receives the support convex portion is provided on the top surface portion. Provided,
A first annular protrusion that is in sliding contact with the inner peripheral surface of the barrel is provided at a position near the top surface portion on the outer peripheral surface of the gasket,
The receiving recess is provided in an inner space of the gasket corresponding to a portion where the first annular protrusion is provided;
The outer peripheral surface of the gasket is provided with a third annular protrusion that is in sliding contact with the inner peripheral surface of the barrel at a position on the open hem side, and the third annular protrusion and the first annular protrusion A second annular protrusion is provided in the intermediate space in sliding contact with the inner peripheral surface of the barrel .

また、請求項２によるシリンジは、請求項１記載のシリンジにおいて、前記バレルの内周面に摺接する前記第１環状突部の摺接面はガスケットの高さ方向に幅を有しない曲面部によって構成されていることを特徴とするものである。   The syringe according to claim 2 is the syringe according to claim 1, wherein the sliding contact surface of the first annular protrusion that is in sliding contact with the inner peripheral surface of the barrel is a curved surface portion having no width in the height direction of the gasket. It is characterized by being comprised.

また、請求項３によるシリンジは、請求項１記載のシリンジにおいて、前記バレルの内周面に摺接する前記第１環状突部の摺接面はガスケットの高さ方向に幅を有する直胴部によって構成されていることを特徴とするものである。   The syringe according to claim 3 is the syringe according to claim 1, wherein the sliding contact surface of the first annular protrusion that is in sliding contact with the inner peripheral surface of the barrel is formed by a straight body portion having a width in the height direction of the gasket. It is characterized by being comprised.

また、請求項４によるシリンジは、請求項１〜３のいずれかに記載のシリンジにおいて、前記プランジャの支持凸部に嵌合部が形成されており、前記嵌合部の内周面に突起部が設けられており、前記ガスケットの受入れ凹部に凸状部が形成されており、前記凸状部に前記突起部と係合する溝部が設けられていることを特徴とするものである。   Moreover, the syringe by Claim 4 is a syringe in any one of Claims 1-3, The fitting part is formed in the support convex part of the said plunger, and a protrusion part is provided in the internal peripheral surface of the said fitting part. And a convex portion is formed in the receiving concave portion of the gasket, and a groove portion that engages with the protruding portion is provided in the convex portion.

そして、前記手段によって以下のような作用が得られる。まず、本発明によるシリンジによれば、ガスケットの天面部に雌ネジ部の内径よりも小径の受入れ凹部が設けられているから、ガスケットのゴム反発力を大きくすることなくガスケットの所望の摺動性を確保することができる。
また、前記受入れ凹部には、プランジャの先端部に設けられている支持凸部が嵌合するからガスケットの第１環状突部での変形量を小さくすることができ、ガスケットの所望の液密性ないし気密性を得ることができる。 The following actions are obtained by the above means. First, according to the syringe according to the present invention, since the receiving recess having a smaller diameter than the inner diameter of the female screw portion is provided in the top surface portion of the gasket, the desired slidability of the gasket can be achieved without increasing the rubber repulsion force of the gasket. Can be secured.
In addition, since the support convex portion provided at the distal end portion of the plunger is fitted in the receiving concave portion, the amount of deformation at the first annular projection of the gasket can be reduced, and the desired liquid tightness of the gasket. Moreover, airtightness can be obtained.

また、前記受入れ凹部を前記第１環状突部が設けられている部位に対応した前記ガスケットの内方空間に設けたから、第１環状突部の縮径方向への変形量を効果的に小さくすることができ、ガスケットの液密性ないし気密性を向上させることができる。
また、前記第１環状突部に加えて、同じくバレルの内周面と摺接する第２環状突部と第３環状突部を設けたから、ガスケットの液密性ないし気密性が一層向上する。 Further, the since the receiving recess is provided inwardly space of the gasket corresponding to the site where the first annular protrusion is provided, the deformation amount of the reduced diameter direction of the first annular protrusion effectively reduced It is possible to improve the liquid tightness or air tightness of the gasket.
Further, in addition to the first annular protrusion, likewise because providing the second annular projection and the third annular projection in sliding contact with the inner peripheral surface of the barrel, liquid-tightness or air-tightness of the gasket can be further improved.

また、前記第１環状突部の摺接面をガスケットの高さ方向に幅を有しない曲面部によって構成した場合には、ガスケットの摺動性が向上する。
また、前記第１環状突部の摺接面をガスケットの高さ方向に幅を有する直胴部によって構成した場合には、ガスケットの液密性ないし気密性が向上する。 Further, when the sliding contact surface of the first annular protrusion is constituted by a curved surface portion having no width in the height direction of the gasket, the slidability of the gasket is improved.
Further, when the sliding contact surface of the first annular protrusion is constituted by a straight body portion having a width in the height direction of the gasket, the liquid tightness or air tightness of the gasket is improved.

また、前記プランジャの支持凸部に嵌合部が形成されており、前記嵌合部の内周面に突起部が設けられており、前記ガスケットの受入れ凹部に凸状部が形成されており、前記凸状部に前記突起部と係合する溝部が設けられている場合には、プランジャにおける雄ネジ部がガスケットにおける雌ネジ部に螺合されてネジ締結されると、支持凸部が受入れ凹部に嵌合して天面部の内壁面に当接した状態になるとともに、嵌合部内周面の突起部が柔軟な凸状部を乗り越えて溝部に係合され、固定された状態になる。したがってガスケットとプランジャとの緩みを効果的に防止することができる。   Further, a fitting portion is formed on the support convex portion of the plunger, a protrusion is provided on the inner peripheral surface of the fitting portion, and a convex portion is formed in the receiving concave portion of the gasket, In the case where the protrusion is provided with a groove that engages with the protrusion, when the male threaded portion of the plunger is screwed into the female threaded portion of the gasket and tightened with the screw, the support convex portion receives the recessed portion. And the protrusion on the inner peripheral surface of the fitting portion gets over the flexible convex portion and is engaged with the groove to be in a fixed state. Therefore, loosening between the gasket and the plunger can be effectively prevented.

本発明のシリンジによると、ガスケットの形状とプランジャの先端部の形状を一部改変するだけの極めて簡単な構成によって現行品を上回るガスケットの円滑な摺動性と優れた液密性ないし気密性を得ることができる。   According to the syringe of the present invention, the smooth sliding property of the gasket and the excellent liquid-tightness or air-tightness exceeding the current products are achieved by an extremely simple configuration that only modifies the shape of the gasket and the tip of the plunger. Can be obtained.

本発明の実施の形態を示す図で、シリンジを示す側面図である。It is a figure which shows embodiment of this invention and is a side view which shows a syringe. 本発明の実施の形態を示す図で、ガスケットを拡大して示す側面図である。It is a figure which shows embodiment of this invention, and is a side view which expands and shows a gasket. 本発明の実施の形態を示す図で、ガスケットを拡大して示す底面図である。It is a figure which shows embodiment of this invention, and is a bottom view which expands and shows a gasket. 本発明の実施の形態を示す図で、ガスケットとプランジャの先端部を拡大して示す側断面図である。It is a figure which shows embodiment of this invention, and is a sectional side view which expands and shows the front-end | tip part of a gasket and a plunger. 本発明の他の実施の形態を示す図で、ガスケットとプランジャの先端部を拡大して示す側断面図である。It is a figure which shows other embodiment of this invention, and is a sectional side view which expands and shows the front-end | tip part of a gasket and a plunger. 現行品の一例を示す図で、ガスケットとプランジャの先端部を拡大して示す側断面図である。It is a figure which shows an example of the present goods, and is a sectional side view which expands and shows the front-end | tip part of a gasket and a plunger. 現行品、発明品、比較品を検体として比較試験１のプランジャの押込み量と摺動抵抗値の解析結果を示すグラフである。It is a graph which shows the analysis result of the pushing amount and sliding resistance value of the plunger of the comparative test 1 by making the present goods, invention goods, and comparative goods into a sample. 現行品、発明品、比較品を検体として比較試験１のピーク別の摺動抵抗値の解析結果を示すグラフである。It is a graph which shows the analysis result of the sliding resistance value according to the peak of comparative test 1 for the current product, the invention product, and the comparative product. 現行品、発明品、比較品を検体として比較試験２のプランジャの押込み量と摺動抵抗値の解析結果を示すグラフである。It is a graph which shows the analysis result of the pushing amount and sliding resistance value of the plunger of the comparative test 2 by making the present goods, invention goods, and comparative goods into a sample. 現行品、発明品、比較品を検体として比較試験２の全体の摺動抵抗値とピーク別の摺動抵抗値を示す比較表である。It is a comparison table | surface which shows the sliding resistance value of the whole and the peak-specific sliding resistance value of the comparative test 2 by making the present product, invention product, and comparative product into a sample. 現行品、発明品を検体として比較試験３のプランジャの変位と摺動抵抗値の解析結果を示すグラフである。It is a graph which shows the analysis result of the displacement and sliding resistance value of the plunger of the comparative test 3 by making the present product and invention into a sample. 本発明の更に他の実施の形態を示す図で、ガスケットとプランジャの先端部を拡大して示す側断面図である。It is a figure which shows other embodiment of this invention, and is a sectional side view which expands and shows the front-end | tip part of a gasket and a plunger. 本発明の更に他の実施の形態を示す図で、ガスケットを拡大して示す底面図である。It is a figure which shows other embodiment of this invention, and is a bottom view which expands and shows a gasket. 本発明の更に他の実施の形態を示す図で、プランジャを拡大して示す平面図である。It is a figure which shows other embodiment of this invention, and is a top view which expands and shows a plunger.

以下、図示の実施の形態を例にとって、本発明を実施するための形態を説明する。図１は本発明のシリンジを示す側面図、図２は同上、ガスケットを拡大して示す側面図、図３は同上、ガスケットを拡大して示す底面図、図４は同上、ガスケットとプランジャの先端部を拡大して示す側断面図である。   Hereinafter, an embodiment for carrying out the present invention will be described by taking the illustrated embodiment as an example. 1 is a side view showing a syringe of the present invention, FIG. 2 is a side view showing an enlarged gasket, FIG. 3 is a bottom view showing the gasket enlarged, and FIG. 4 is the same as above, and FIG. It is a sectional side view which expands and shows a part.

本発明のシリンジ１は図示しない持続注入装置に対して取り付けられることによって一例として使用され、例えば２０ミリリットルの液体Ｌがバレル３内に注入されたシリンジ１であれば約５時間かけて液体Ｌが体内に自動的に持続注入されるようになっている。シリンジ１は液体Ｌを注入するバレル３と、バレル３内に注入された液体Ｌを押し出すプランジャ５と、プランジャ５の先端部７に取り付けられるガスケット９とを備えることによって構成されている。   The syringe 1 of the present invention is used as an example by being attached to a continuous infusion device (not shown). For example, in the case of the syringe 1 in which 20 ml of liquid L is injected into the barrel 3, the liquid L takes about 5 hours. It is designed to be continuously injected into the body automatically. The syringe 1 includes a barrel 3 that injects a liquid L, a plunger 5 that pushes out the liquid L injected into the barrel 3, and a gasket 9 that is attached to the tip 7 of the plunger 5.

バレル３は一端が閉塞された透明な円筒容器状の部材で一例としてポリプロピレンや環状ポリオレフィン等の硬質プラスチック材料によって形成されている。
バレル３の開放された他端側にはフランジ状に外方に張り出した指掛け部１１が形成されている。尚、指掛け部１１は一例として上下方向に多く張り出すように形成されており、当該多く張り出した部分に指を掛けるように構成されている。 The barrel 3 is a transparent cylindrical container member whose one end is closed, and is formed of a hard plastic material such as polypropylene or cyclic polyolefin as an example.
On the other end of the barrel 3 that is opened, a finger hook 11 that protrudes outward in a flange shape is formed. In addition, as an example, the finger-hanging part 11 is formed so as to protrude a lot in the vertical direction, and is configured so that a finger is hung on the protruding part.

一方、バレル３の閉塞された一端面にはバレル３の周胴部１３よりも縮径されたノズル部１５が形成されている。また、該ノズル部１５には図１に示す未使用状態ではプラグ１７が取り付けられ、ノズル部１５の開口１９が封止されている。
プランジャ５は前記バレル３と同様の硬質プラスチック材料等の剛体によって形成されている。そして、該プランジャ５は前記バレル３の周胴部１３内に挿嵌されるロッド２１と、該ロッド２１における基端部２３に形成されている一例として円板状の押圧板２５とを備えている。また、プランジャ５の先端部７には前記ガスケット９を取り付けるための雄ネジ部２７と、前記ガスケット９の天面部２９における内壁面３１に当接してガスケット９を支持する支持凸部３３とが設けられている。
そして、前記支持凸部３３の外径Ｄ１は前記雄ネジ部２７の谷径Ｄ２よりも小径に形成されている。 On the other hand, a nozzle portion 15 having a diameter smaller than that of the peripheral body portion 13 of the barrel 3 is formed on one end face of the barrel 3 that is closed. Further, a plug 17 is attached to the nozzle portion 15 when not in use as shown in FIG. 1, and the opening 19 of the nozzle portion 15 is sealed.
The plunger 5 is formed of a rigid body such as a hard plastic material similar to the barrel 3. The plunger 5 includes a rod 21 to be inserted into the peripheral body portion 13 of the barrel 3 and a disc-shaped pressing plate 25 as an example formed at the base end portion 23 of the rod 21. Further, the distal end portion 7 of the plunger 5 is provided with a male screw portion 27 for attaching the gasket 9 and a support convex portion 33 that contacts the inner wall surface 31 of the top surface portion 29 of the gasket 9 and supports the gasket 9. It has been.
The outer diameter D1 of the support protrusion 33 is smaller than the root diameter D2 of the male screw portion 27.

ガスケット９は合成ゴム等の柔軟性を有する弾性材料によって形成されている。そして、該ガスケット９は天面部２９が閉塞されたキャップ状の部材で、天面部２９は中心が高くなった傘状の形状を有している。前記天面部２９の周縁には前記プランジャ５側に延びる胴部３５が一体に形成されている。
また、前記胴部３５の外周面３７には前記天面部２９寄りの位置に前記バレル３の周胴部１３における内周面１４と摺接する第１環状突部３９が設けられている。
尚、第１環状突部３９の摺接面はガスケット９の高さ方向Ｈに幅Ｂを有しない曲面部によって構成されている。 The gasket 9 is made of a flexible elastic material such as synthetic rubber. The gasket 9 is a cap-shaped member with the top surface portion 29 closed, and the top surface portion 29 has an umbrella shape with a raised center. A body 35 extending toward the plunger 5 is integrally formed on the periphery of the top surface 29.
In addition, a first annular protrusion 39 that is in sliding contact with the inner peripheral surface 14 of the peripheral barrel portion 13 of the barrel 3 is provided on the outer peripheral surface 37 of the barrel portion 35 at a position near the top surface portion 29.
The sliding contact surface of the first annular protrusion 39 is formed by a curved surface portion having no width B in the height direction H of the gasket 9.

また、前記胴部３５の外周面３７には開放された裾部４１側の位置に同じく前記バレル３の周胴部１３における内周面１４と摺接する第３環状突部４３が設けられており、前記第３環状突部４３と前記第１環状突部３９の中間位置に同じく前記バレル３の周胴部１３における内周面１４と摺接する第２環状突部４５が設けられている。
尚、第２環状突部４５の摺接面は前記第１環状突部３９の摺接面と同様、ガスケット９の高さ方向Ｈに幅Ｂを有しない曲面部によって構成されており、第３環状突部４３の摺接面はガスケット９の高さ方向Ｈに幅Ｂを有する直胴部によって構成されている。 Further, the outer peripheral surface 37 of the barrel portion 35 is provided with a third annular protrusion 43 that is slidably in contact with the inner peripheral surface 14 of the peripheral barrel portion 13 of the barrel 3 at a position on the opened skirt portion 41 side. Similarly, a second annular protrusion 45 is provided at an intermediate position between the third annular protrusion 43 and the first annular protrusion 39 so as to be in sliding contact with the inner peripheral surface 14 of the peripheral body 13 of the barrel 3.
The sliding contact surface of the second annular protrusion 45 is formed by a curved surface portion having no width B in the height direction H of the gasket 9, similar to the sliding contact surface of the first annular protrusion 39. The slidable contact surface of the annular protrusion 43 is constituted by a straight body portion having a width B in the height direction H of the gasket 9.

因みに本実施の形態では、第１環状突部３９、第２環状突部４５、第３環状突部４３のそれぞれの頂部（ピーク）を第１ピークＰ１、第２ピークＰ２、第３ピークＰ３とし、それぞれのピークの直径を共に一例として２０．６ｍｍに設定している。
また、胴部３５の外周面３７の直径Ｄ３を一例として１９．８ｍｍに設定しており、従来のガスケットよりも胴部３５の厚みを厚くしている。 Incidentally, in the present embodiment, the top portions (peaks) of the first annular protrusion 39, the second annular protrusion 45, and the third annular protrusion 43 are defined as a first peak P1, a second peak P2, and a third peak P3. As an example, the diameter of each peak is set to 20.6 mm.
Moreover, the diameter D3 of the outer peripheral surface 37 of the trunk | drum 35 is set to 19.8 mm as an example, and the thickness of the trunk | drum 35 is made thicker than the conventional gasket.

また、前記ガスケット９の内方空間には胴部３５の内周面にプランジャ５の先端部７に設けられている前記雄ネジ部２７と螺合する雌ネジ部４７が刻設され、天面部２９に前記支持凸部３３を受け入れる前記雌ネジ部４７の内径Ｄ４よりも小径の内径Ｄ５を有する受入れ凹部４９が設けられている。
因みに本実施の形態では、雌ネジ部４７の内径Ｄ４を１１．６ｍｍ、受入れ凹部４９の内径Ｄ５を９．６ｍｍに設定している。 Further, in the inner space of the gasket 9, a female screw portion 47 that is screwed with the male screw portion 27 provided at the distal end portion 7 of the plunger 5 is engraved on the inner peripheral surface of the trunk portion 35, and the top surface portion. 29 is provided with a receiving recess 49 having an inner diameter D5 that is smaller than the inner diameter D4 of the female thread portion 47 that receives the support convex portion 33.
Incidentally, in the present embodiment, the inner diameter D4 of the female screw portion 47 is set to 11.6 mm, and the inner diameter D5 of the receiving recess 49 is set to 9.6 mm.

この他、胴部３５の裾部４１側の端面には底面視長円形状の突起５１が一例として９０°間隔で４つ設けられている。
そして、このようなガスケット９が前記プランジャ５の先端部７に取り付けられた状態では、雄ネジ部２７が雌ネジ部４７に螺合されてネジ締結され、支持凸部３３が受入れ凹部４９に嵌合して天面部２９の内壁面３１に当接した状態になっている。 In addition, four projections 51 having an oval shape in a bottom view are provided on the end surface of the body portion 35 on the skirt portion 41 side as an example at intervals of 90 °.
When such a gasket 9 is attached to the distal end portion 7 of the plunger 5, the male screw portion 27 is screwed into the female screw portion 47 and screwed, and the support convex portion 33 is fitted into the receiving concave portion 49. Together, they are in contact with the inner wall surface 31 of the top surface portion 29.

以上の構成を基に前記実施の形態に係るシリンジ１の作用、効果を図７〜１０に比較試験の結果と併せて説明する。
図６は現行のガスケットとプランジャの先端部を拡大して示す側断面図、図７は内圧をかけない状態で行った現行品と発明品と比較品のプランジャの押込み量と摺動抵抗値との関係を示すグラフ、図８は同上、ピーク別の摺動抵抗値を示すグラフ、図９は内圧をかけた状態で行った現行品と発明品と比較品のプランジャの押込み量と摺動抵抗値との関係を示すグラフ、図１０は同上、全体の摺動抵抗値とピーク別の摺動抵抗値を示す比較表である。 Based on the above structure, the effect | action and effect of the syringe 1 which concern on the said embodiment are demonstrated with the result of a comparative test to FIGS.
FIG. 6 is an enlarged side sectional view showing the current gasket and the tip of the plunger, and FIG. 7 shows the pushing amount and sliding resistance value of the plungers of the current product, the invention product, and the comparative product in a state where no internal pressure is applied. FIG. 8 is a graph showing the sliding resistance value for each peak, and FIG. 9 is the plunger push-in amount and sliding resistance of the current product, the invention product, and the comparative product, with the internal pressure applied. FIG. 10 is a comparison table showing the overall sliding resistance value and the sliding resistance value by peak.

（１）比較試験１（図７、８参照）
比較試験１では現行品と発明品と比較品の３つの検体についてプランジャの押込み量と摺動抵抗値との関係と、ピーク別の摺動抵抗値を解析し、その解析結果を比較した。また、現行品と比較品に係るシリンジ１００は共に図６に示す形状で、第１ピークＰ１の直径が２０．５５ｍｍ、第２ピークＰ２の直径が２０．３５ｍｍ、第３ピークＰ３の直径が２０．６ｍｍ、胴部３５の外周面３７の直径Ｄ３が１９．４ｍｍのものを使用し、比較品では材質ａのバレル３を使用し、現行品では材質ｂのバレル３を使用した。
尚、材質ａのバレル３はポリプロピレン製で弾性率が１３５０ＭＰａ、肉厚が０．９５ｍｍ、周胴部１３の内径が２０．１ｍｍ、材質ｂのバレル３は環状ポリオレフィン製で弾性率が３２００ＭＰａ、肉厚が１．１ｍｍ、周胴部１３の内径が２０．１ｍｍである。 (1) Comparative test 1 (see FIGS. 7 and 8)
In Comparative Test 1, the relationship between the plunger push-in amount and the sliding resistance value and the sliding resistance value for each peak were analyzed for three samples of the current product, the invention product, and the comparative product, and the analysis results were compared. Further, the syringe 100 according to the current product and the comparative product are both in the shape shown in FIG. 6, the diameter of the first peak P1 is 20.55 mm, the diameter of the second peak P2 is 20.35 mm, and the diameter of the third peak P3 is 20. 6 mm and the diameter D3 of the outer peripheral surface 37 of the body portion 35 is 19.4 mm. The comparative product uses the barrel 3 made of the material a, and the current product uses the barrel 3 made of the material b.
The barrel 3 made of material a is made of polypropylene and has an elastic modulus of 1350 MPa, a wall thickness of 0.95 mm, the inner diameter of the peripheral barrel 13 is 20.1 mm, and the barrel 3 of material b is made of cyclic polyolefin and has an elastic modulus of 3200 MPa and a wall thickness. 1.1 mm and the inner diameter of the circumferential barrel 13 is 20.1 mm.

また、前記材質ｂのバレル３を使用した現行品に係るシリンジ１００を使用した場合に摺動抵抗値が２５Ｎになる摩擦係数μを算出した摩擦係数μ＝０．５を基準にして前記材質ｂのバレル３を使用した現行品と、材質ｂのバレル３を適用した図１〜４に示す本実施の形態に係る発明品と、前記材質ａのバレル３を使用した比較品とについて比較試験を実施した。   Further, when the syringe 100 according to the current product using the barrel 3 of the material b is used, the material b is calculated based on the friction coefficient μ = 0.5, which is obtained by calculating the friction coefficient μ at which the sliding resistance value becomes 25N. 1 to 4 using the barrel 3 made of the material b, and the comparative product using the barrel 3 made of the material a. Carried out.

プランジャ５の押込み量と摺動抵抗値との関係は図７に示すようになっており、材質ｂのバレル３を使用した現行品と、材質ａのバレル３を使用した比較品では大きな差異が見られなかったが、材質ｂのバレル３を使用した発明品では摺動抵抗値の大幅な改善（減少）が確認された。
尚、材質ｂのバレル３を使用した現行品の摺動抵抗値が２５．１Ｎ、材質ａのバレル３を使用した比較品の摺動抵抗値が２４．４Ｎ、材質ｂのバレル３を使用した発明品の摺動抵抗値が１７．４Ｎであった。 The relationship between the pushing amount of the plunger 5 and the sliding resistance value is as shown in FIG. 7, and there is a large difference between the current product using the barrel 3 made of the material b and the comparative product using the barrel 3 made of the material a. Although not seen, a significant improvement (decrease) in the sliding resistance value was confirmed in the invention using the barrel 3 of the material b.
In addition, the sliding resistance value of the current product using the barrel 3 of the material b is 25.1N, the sliding resistance value of the comparative product using the barrel 3 of the material a is 24.4N, and the barrel 3 of the material b is used. The sliding resistance value of the product of the invention was 17.4N.

また第１ピークＰ１と、第２ピークＰ２、第３ピークＰ３とのピーク別の摺動抵抗値は図８に示すようになっており、ピーク別の摺動抵抗値についても前記と同様の結果が得られた。
従って、ガスケット９の摺動抵抗については、バレル３の材質の違いによる影響は少なく、ガスケット９及びプランジャ５の先端部７における形状の違いによって大きく変化し、これらの形状を工夫することによってガスケット９における摺動抵抗の減少が図られることが分かった。
尚、本実施の形態に係る発明品の摺動抵抗値は上述したように１７．４Ｎであり、目標値である２０Ｎをクリアし、ガスケット９の一層の摺動性の向上に寄与し得ることが確認された。 Further, the sliding resistance value for each peak of the first peak P1, the second peak P2, and the third peak P3 is as shown in FIG. 8, and the sliding resistance value for each peak is the same result as described above. was gotten.
Accordingly, the sliding resistance of the gasket 9 is less influenced by the difference in the material of the barrel 3 and greatly changes depending on the difference in the shape of the gasket 9 and the tip 7 of the plunger 5, and the gasket 9 is devised by devising these shapes. It was found that the sliding resistance was reduced.
In addition, the sliding resistance value of the product according to the present embodiment is 17.4N as described above, clears the target value of 20N, and can contribute to further improvement of the slidability of the gasket 9. Was confirmed.

（２）比較試験２（図９、１０参照）
比較試験２では前記比較試験１と同一の３種類の検体に対して０．０４５ＭＰａの内圧をそれぞれかけ、摩擦係数μ＝０．３の条件下で、プランジャ５の押込み量と摺動抵抗値との関係とピーク別の摺動抵抗値を解析し、その解析結果を比較した。 (2) Comparative test 2 (see FIGS. 9 and 10)
In comparative test 2, an internal pressure of 0.045 MPa was applied to the same three types of specimens as in comparative test 1, and the pushing amount of the plunger 5 and the sliding resistance value under the condition of the friction coefficient μ = 0.3 And the sliding resistance value by peak were analyzed, and the analysis results were compared.

プランジャ５の押込み量と摺動抵抗値との関係は図９に示すようになっており、前記比較試験１と同様、材質ｂのバレル３を使用した現行品と、材質ａのバレル３を使用した比較品では大きな差異が見られなかったが、材質ｂのバレル３を使用した発明品では摺動抵抗値の大幅な改善（減少）が確認された。
尚、材質ｂのバレル３を使用した現行品の摺動抵抗値が２９．８Ｎ、材質ａのバレル３を使用した比較品の摺動抵抗値が２９．５Ｎ、材質ｂのバレル３を使用した発明品の摺動抵抗値が２５．３Ｎであった。 The relationship between the pushing amount of the plunger 5 and the sliding resistance value is as shown in FIG. 9, and the current product using the barrel 3 made of the material b and the barrel 3 made of the material a are used as in the comparative test 1. Although no significant difference was observed in the comparative product, significant improvement (decrease) in the sliding resistance value was confirmed in the invention using the barrel 3 made of the material b.
The sliding resistance value of the current product using the barrel 3 of the material b is 29.8N, the sliding resistance value of the comparative product using the barrel 3 of the material a is 29.5N, and the barrel 3 of the material b is used. The sliding resistance value of the product of the invention was 25.3N.

また、第１ピークＰ１と、第２ピークＰ２と、第３ピークＰ３とのピーク別の摺動抵抗値は図１０に示すようになっており、ピーク別の摺動抵抗値についても前記と同様の結果が得られ、特に第１ピークＰ１と第２ピークＰ２とで摺動抵抗値の顕著な減少が確認された。
従って、前記比較試験１と同様、ガスケット９の摺動抵抗については、バレル３の材質の違いによる影響は少なく、ガスケット９及びプランジャ５の先端部７における形状の違いによって大きく変化し、本実施の形態に係る発明品によればガスケット９の一層の摺動性の向上に寄与し得ることが確認された。 The peak-specific sliding resistance values of the first peak P1, the second peak P2, and the third peak P3 are as shown in FIG. 10, and the peak-specific sliding resistance values are the same as described above. As a result, a significant decrease in the sliding resistance value was confirmed particularly at the first peak P1 and the second peak P2.
Therefore, as in the comparative test 1, the sliding resistance of the gasket 9 is less affected by the difference in the material of the barrel 3 and greatly changes depending on the difference in the shapes of the gasket 9 and the tip portion 7 of the plunger 5. It was confirmed that the invention according to the embodiment can contribute to further improvement of the slidability of the gasket 9.

（３）比較試験３（図１１参照）
比較試験３では前記現行品と発明品の２つの検体についてポンプにて持続注入に用いた場合のプランジャ５の変位と摺動抵抗値との関係を解析し、その解析結果を比較した。 (3) Comparative test 3 (see FIG. 11)
In the comparative test 3, the relationship between the displacement of the plunger 5 and the sliding resistance value when the two samples of the current product and the invention product were used for continuous injection by a pump was analyzed, and the analysis results were compared.

プランジャ５の変位と摺動抵抗値との関係は図１１に示すようになっており、現行品では大きい振幅のぎざぎざ（鋸歯状変化）であるため摺動抵抗値のピークの変形は大きいのに対し、発明品では小さい振幅のぎざぎざ（鋸歯状変化）であるため摺動抵抗値のピークの変形は小さいことが確認された。   The relationship between the displacement of the plunger 5 and the sliding resistance value is as shown in FIG. 11, and since the current product is jagged (sawtooth change) with a large amplitude, the deformation of the peak of the sliding resistance value is large. On the other hand, it was confirmed that the deformation of the peak of the sliding resistance value was small because the invention product was jagged (sawtooth change) with a small amplitude.

従って、持続注入されるシリンジにおいて、本実施の形態に係る発明品では、現行品のぎこちない動きに対して、摺動性の違いによってより滑らかな摺動特性が得られ、ガスケット９の一層の円滑な摺動性の向上に寄与し得ることが確認された。   Therefore, in the continuously injecting syringe, the invention according to the present embodiment can obtain a smoother sliding characteristic due to the difference in slidability with respect to the awkward movement of the current product, and the gasket 9 can be made smoother. It has been confirmed that it can contribute to the improvement of slidability.

以上、本実施の形態によると、次のような効果を奏することができる。
即ち、本実施の形態に係るシリンジ１によると、ガスケット９の形状とプランジャ５の先端部７の形状を一部改変するだけの極めて簡単な構成によって現行品や比較品を上回るガスケット９の円滑な摺動性と、優れた液密性ないし気密性を得ることができるようになる。 As described above, according to the present embodiment, the following effects can be obtained.
That is, according to the syringe 1 according to the present embodiment, the gasket 9 is smoother than the current product and the comparative product with a very simple configuration that only partially changes the shape of the gasket 9 and the shape of the tip portion 7 of the plunger 5. Slidability and excellent liquid tightness or air tightness can be obtained.

尚、本発明のシリンジ１は前記の実施の形態のものに限定されず、その発明の要旨内での設計変更が可能である。例えば、ガスケット９は第１環状突部３９と第２環状突部４５と第３環状突部４３の３つを備えていればよい。従って、４つ以上の環状突部が設けられているガスケット９でも構わない。
また、前記第１環状突部３９、第２環状突部４５及び第３環状突部４３の形状や直径、胴部３５の外周面３７の直径Ｄ３、支持凸部３３の外径Ｄ１や高さ、あるいは受入れ凹部４９の内径Ｄ５も前記実施の形態のものに限定されることなく、種々の変更が可能である。その一例を図５に示す。 In addition, the syringe 1 of this invention is not limited to the thing of the said embodiment, The design change within the summary of the invention is possible. For example, the gasket 9 only needs to include the first annular protrusion 39, the second annular protrusion 45, and the third annular protrusion 43. Therefore, the gasket 9 provided with four or more annular protrusions may be used.
Further, the shape and diameter of the first annular protrusion 39, the second annular protrusion 45, and the third annular protrusion 43, the diameter D3 of the outer peripheral surface 37 of the body 35, the outer diameter D1 and the height of the support protrusion 33 Alternatively, the inner diameter D5 of the receiving recess 49 is not limited to that of the above embodiment, and various changes can be made. An example is shown in FIG.

図５はガスケットの第１環状突部の形状と、第２環状突部の直径を異らせた他の実施の形態を示す側断面図である。即ち、図５に示す実施の形態ではガスケット９の第１環状突部３９が前記図１〜４に示す実施の形態と異っており、第１環状突部３９の摺接面がガスケット９の高さ方向Ｈに幅Ｂを有する直胴部によって構成されている。
また、図５に示す実施の形態ではガスケット９の第２環状突部４５の直径が前記第１環状突部３９の直径２０．６ｍｍよりも小径の２０．３ｍｍに設定されている。そして、このような構成のガスケット９を使用したシリンジ１Ａも、前記図１〜４に示すシリンジ１と同様、所望のガスケット９の摺動性と、液密性ないし気密性を有しており、第１環状突部３９に設けた直胴部の存在によって図１〜４に示すシリンジ１よりも液密性ないし気密性に優れた構造になっている。 FIG. 5 is a side sectional view showing another embodiment in which the shape of the first annular protrusion of the gasket is different from the diameter of the second annular protrusion. That is, in the embodiment shown in FIG. 5, the first annular protrusion 39 of the gasket 9 is different from the embodiment shown in FIGS. 1 to 4, and the sliding contact surface of the first annular protrusion 39 is the same as that of the gasket 9. It is constituted by a straight body portion having a width B in the height direction H.
In the embodiment shown in FIG. 5, the diameter of the second annular protrusion 45 of the gasket 9 is set to 20.3 mm, which is smaller than the diameter 20.6 mm of the first annular protrusion 39. And the syringe 1A using the gasket 9 of such a structure also has the slidability of the desired gasket 9, and liquid-tightness thru | or airtightness similarly to the syringe 1 shown in the said FIGS. Due to the presence of the straight body portion provided in the first annular protrusion 39, the structure is more excellent in liquid tightness or air tightness than the syringe 1 shown in FIGS.

また、図１２〜図１４に示すように更に他の実施の形態とすることも可能である。この実施の形態では、前記プランジャ５の支持凸部３３に嵌合部５３が形成されており、前記嵌合部５３の内周面に突起部５５が設けられており、前記ガスケット９の受入れ凹部４９に凸状部５７が形成されており、前記凸状部５７に前記突起部５５と係合する溝部５９が設けられているものである。その他の構成は前記実施の形態の場合と同じであり、その説明は省略する。
前記構成によると、プランジャ５における雄ネジ部２７がガスケット９における雌ネジ部４７に螺合されてネジ締結されると、プランジャ５の支持凸部３３が受入れ凹部４９に嵌合して天面部２９の内壁面に当接した状態になるとともに、嵌合部５３内周面の突起部５５が柔軟な凸状部５７を乗り越えて溝部５９に係合され、固定された状態になる。 Moreover, as shown in FIGS. 12-14, it is possible to set it as another embodiment. In this embodiment, a fitting portion 53 is formed on the support convex portion 33 of the plunger 5, a projection 55 is provided on the inner peripheral surface of the fitting portion 53, and a receiving concave portion of the gasket 9. A convex portion 57 is formed at 49, and a groove portion 59 that engages with the protruding portion 55 is provided at the convex portion 57. Other configurations are the same as those in the above embodiment, and the description thereof is omitted.
According to the above configuration, when the male screw portion 27 of the plunger 5 is screwed into the female screw portion 47 of the gasket 9 and screwed, the support convex portion 33 of the plunger 5 is fitted into the receiving concave portion 49 and the top surface portion 29. The protrusion 55 on the inner peripheral surface of the fitting portion 53 gets over the flexible convex portion 57 and is engaged with the groove 59 to be fixed.

したがってこのような構成のガスケット９を使用したシリンジ１Ｂも、前記図１〜４に示すシリンジ１と同様、所望のガスケット９の摺動性と、液密性ないし気密性を有しており、しかも製造中や輸送中の振動等によるガスケット９とプランジャ５との緩み防止機能を発揮することができる。   Therefore, the syringe 1B using the gasket 9 having such a configuration also has the desired slidability and liquid-tightness or air-tightness of the gasket 9 as in the syringe 1 shown in FIGS. The function of preventing loosening between the gasket 9 and the plunger 5 due to vibration during production or transportation can be exhibited.

本発明は、液体を注入するバレルと、バレル内に注入された液体を押し出すプランジャと、プランジャの先端部に取り付けられるガスケットとを具備したシリンジの製造、使用分野等で利用でき、特にガスケットの摺動性の向上と、液密性ないし気密性の向上とを図りたい場合に利用可能性を有する。   INDUSTRIAL APPLICABILITY The present invention can be used in the manufacture and field of use of a syringe including a barrel for injecting liquid, a plunger for pushing out the liquid injected into the barrel, and a gasket attached to the tip of the plunger. It has applicability when it is desired to improve the mobility and improve the liquid tightness or air tightness.

１ シリンジ（発明品）
１Ａ シリンジ
１Ｂ シリンジ
３ バレル
５ プランジャ
７ 先端部
９ ガスケット
１１ 指掛け部
１３ 周胴部
１４ 内周面
１５ ノズル部
１７ プラグ
１９ 開口
２１ ロッド
２３ 基端部
２５ 押圧板
２７ 雄ネジ部
２９ 天面部
３１ 内壁面
３３ 支持凸部
３５ 胴部
３７ 外周面
３９ 第１環状突部
４１ 裾部
４３ 第３環状突部
４５ 第２環状突部
４７ 雌ネジ部
４９ 受入れ凹部
５１ 突起
５３ 嵌合部
５５ 突起部
５７ 凸状部
５９ 溝部
１００ シリンジ（現行品）
Ｌ 液体
Ｄ１ 外径
Ｄ２ 谷径
Ｐ１ 第１ピーク
Ｐ２ 第２ピーク
Ｐ３ 第３ピーク
Ｄ３ 直径
Ｄ４ 内径
Ｄ５ 内径
Ｈ 高さ方向
Ｂ 幅 1 Syringe (Invention)
DESCRIPTION OF SYMBOLS 1A Syringe 1B Syringe 3 Barrel 5 Plunger 7 Tip part 9 Gasket 11 Finger hook part 13 Circumferential body part 14 Inner peripheral surface 15 Nozzle part 17 Plug 19 Opening 21 Rod 23 Base end part 25 Pressing plate 27 Male thread part 29 Top surface part 31 Inner wall surface 33 Support Convex part 35 Body part 37 Outer peripheral surface 39 First annular protrusion 41 Bottom part 43 Third annular protrusion 45 Second annular protrusion 47 Female thread part 49 Receiving recessed part 51 Protrusion 53 Fitting part 55 Protruding part 57 Convex part 59 Groove 100 Syringe (current product)
L liquid D1 outer diameter D2 valley diameter P1 first peak P2 second peak P3 third peak D3 diameter D4 inner diameter D5 inner diameter H height direction B width

Claims (4)

液体を注入するバレルと、バレル内に注入された液体を押し出すプランジャと、プランジャの先端部に取り付けられるガスケットと、を具備したシリンジにおいて、
前記プランジャの先端部には前記ガスケットを取り付けるための雄ネジ部と、前記ガスケットの天面部の内壁面に当接してガスケットを支持する前記雄ネジ部の谷径よりも小径の支持凸部とが設けられており、
前記ガスケットの内方空間には内周面に前記雄ネジ部と螺合する雌ネジ部が刻設され、天面部に前記支持凸部を受け入れる前記雌ネジ部の内径よりも小径の受入れ凹部が設けられており、
前記ガスケットの外周面には天面部寄りの位置に前記バレルの内周面と摺接する第１環状突部が設けられており、
前記受入れ凹部は前記第１環状突部が設けられている部位に対応した前記ガスケットの内方空間に設けられており、
前記ガスケットの外周面には開放された裾部側の位置に前記バレルの内周面と摺接する第３環状突部が設けられており、前記第３環状突部と前記第１環状突部の中間空間に前記バレルの内周面と摺接する第２環状突部が設けられていることを特徴とするシリンジ。 In a syringe comprising a barrel for injecting liquid, a plunger for pushing out the liquid injected into the barrel, and a gasket attached to the tip of the plunger,
A male screw part for attaching the gasket to the tip of the plunger, and a support convex part having a diameter smaller than the valley diameter of the male screw part that contacts the inner wall surface of the top surface part of the gasket and supports the gasket. Provided,
In the inner space of the gasket, a female screw portion that is screwed with the male screw portion is formed on the inner peripheral surface, and a receiving recess having a smaller diameter than the inner diameter of the female screw portion that receives the support convex portion is provided on the top surface portion. Provided,
A first annular protrusion that is in sliding contact with the inner peripheral surface of the barrel is provided at a position near the top surface portion on the outer peripheral surface of the gasket,
The receiving recess is provided in an inner space of the gasket corresponding to a portion where the first annular protrusion is provided;
The outer peripheral surface of the gasket is provided with a third annular protrusion that is in sliding contact with the inner peripheral surface of the barrel at a position on the open hem side, and the third annular protrusion and the first annular protrusion The syringe characterized by the 2nd cyclic | annular protrusion part slidably contacting with the internal peripheral surface of the said barrel in the intermediate space . 前記バレルの内周面に摺接する前記第１環状突部の摺接面はガスケットの高さ方向に幅を有しない曲面部によって構成されていることを特徴とする請求項１記載のシリンジ。   The syringe according to claim 1, wherein the sliding contact surface of the first annular protrusion that is in sliding contact with the inner peripheral surface of the barrel is constituted by a curved surface portion having no width in the height direction of the gasket. 前記バレルの内周面に摺接する前記第１環状突部の摺接面はガスケットの高さ方向に幅を有する直胴部によって構成されていることを特徴とする請求項１記載のシリンジ。   The syringe according to claim 1, wherein the sliding contact surface of the first annular protrusion that is in sliding contact with the inner peripheral surface of the barrel is configured by a straight body portion having a width in the height direction of the gasket. 前記プランジャの支持凸部に嵌合部が形成されており、前記嵌合部の内周面に突起部が設けられており、前記ガスケットの受入れ凹部に凸状部が形成されており、前記凸状部に前記突起部と係合する溝部が設けられていることを特徴とする請求項１〜３のいずれかに記載のシリンジ。
A fitting portion is formed on the support convex portion of the plunger, a protrusion is provided on the inner peripheral surface of the fitting portion, a convex portion is formed in the receiving recess of the gasket, and the convex The syringe according to any one of claims 1 to 3, wherein a groove portion that engages with the protruding portion is provided in the shape portion.
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