JP5639769B2 - Plunger rod and syringe - Google Patents

Plunger rod and syringe Download PDF

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Publication number
JP5639769B2
JP5639769B2 JP2010051256A JP2010051256A JP5639769B2 JP 5639769 B2 JP5639769 B2 JP 5639769B2 JP 2010051256 A JP2010051256 A JP 2010051256A JP 2010051256 A JP2010051256 A JP 2010051256A JP 5639769 B2 JP5639769 B2 JP 5639769B2
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screw
thread
plunger rod
gasket
syringe
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JP2011182944A (en
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唐沢　健
健 唐沢
松本　一平
一平 松本
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Taisei Kako Co Ltd
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Taisei Kako Co Ltd
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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
    • A61M5/31515—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
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M2005/3103—Leak prevention means for distal end of syringes, i.e. syringe end for mounting a needle
    • A61M2005/3104—Caps for syringes without needle

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  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (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)

Description

本発明は、弾性を有するガスケットの雌ネジ部と螺合する雄ネジ部を先端部に備えるプランジャーロッドに関し、また、当該プランジャーロッドとを備えるシリンジに関する。   The present invention relates to a plunger rod having a male threaded portion that is screwed with a female threaded portion of an elastic gasket at a distal end portion, and to a syringe having the plunger rod.

従来、プランジャーロッドとして、弾性を有するガスケットの雌ネジ部と螺合する雄ネジ部を先端部に備えるプランジャーロッドが知られている。そして、雄ネジ部と雌ネジ部とが緩むのを防止すべく、雄ネジ部のネジ溝内に突出部が設けられるプランジャーロッドが提案されている（例えば、特許文献１）。   2. Description of the Related Art Conventionally, as a plunger rod, there is known a plunger rod provided with a male screw portion that engages with a female screw portion of an elastic gasket at a tip portion. In order to prevent the male screw portion and the female screw portion from loosening, a plunger rod in which a protruding portion is provided in the thread groove of the male screw portion has been proposed (for example, Patent Document 1).

特開２００７−２６７９０６号公報JP 2007-267906 A

しかしながら、特許文献１に係るプランジャーロッドにおいては、雄ネジ部のネジ溝内に突出部が設けられているため、ガスケットの雌ネジ部が突出部により径方向外方に向けて拡がるように弾性変形する。これにより、例えば、ガスケットの外周部、即ち、シール部までもが変形すると、ガスケットのシール性等に影響を及ぼすことになる。   However, in the plunger rod according to Patent Document 1, since the protruding portion is provided in the thread groove of the male screw portion, it is elastic so that the female screw portion of the gasket expands radially outward by the protruding portion. Deform. Thereby, for example, when the outer peripheral portion of the gasket, that is, even the seal portion is deformed, the sealing performance of the gasket is affected.

よって、本発明は、斯かる事情に鑑み、プランジャーロッドの雄ネジ部とガスケットの雌ネジ部とが緩むのを防止できると共に、ガスケットのシール部が変形するのを抑制できるプランジャーロッド及びシリンジを提供することを課題とする。   Therefore, in view of such circumstances, the present invention is capable of preventing the male thread part of the plunger rod and the female thread part of the gasket from being loosened and also suppressing the deformation of the gasket seal part. It is an issue to provide.

本発明に係るプランジャーロッドは、弾性を有するガスケットの雌ネジ部と螺合する雄ネジ部を先端部に備え、雄ネジ部は、円柱状又は円筒状に形成されるベース体の外周部に、螺旋状に延設されるネジ山を備え、ネジ山は、複数のネジ片が並設されることにより、断続的に配置されるプランジャーロッドであって、ネジ山の延びる方向で、該ネジ山を構成するネジ片と同列となる様にネジ片間に配置された突出部であって、ベース体の外周部から突出する突出部を備え、突出部は、雌ネジ部のネジ山と係合すべく、雄ネジ部のネジ溝内に位置する係合部を備えると共に、係合部と係合することで弾性変形する雌ネジ部のネジ山を、ネジ片との間に逃がすべく、各ネジ片と離間して配置されることを特徴とする。 The plunger rod according to the present invention includes a male threaded portion that engages with a female threaded portion of an elastic gasket at the tip, and the male threaded portion is formed on the outer periphery of a base body that is formed in a columnar or cylindrical shape. A screw thread extending in a spiral shape, and the screw thread is a plunger rod that is intermittently arranged by arranging a plurality of screw pieces in parallel , and in the direction in which the screw thread extends, A protruding portion disposed between the screw pieces so as to be in the same row as the screw pieces constituting the screw thread , the protruding portion protruding from the outer peripheral portion of the base body, the protruding portion and the screw thread of the female screw portion In order to engage, an engagement portion located in the thread groove of the male screw portion is provided, and the thread of the female screw portion that is elastically deformed by engaging with the engagement portion is to be released between the screw pieces. The screw pieces are arranged apart from each screw piece.

本発明に係るプランジャーロッドによれば、雄ネジ部のネジ山が断続的に配置されるように複数並設されているネジ片間に、ベース体の外周部から突出する突出部が配置されている。そして、突出部に設けられる係合部が雄ネジ部のネジ溝内に位置しているため、雄ネジ部と雌ネジ部とが螺合すると、係合部が雌ネジ部のネジ山と係合する。さらに、突出部が各ネジ片と離間して配置されているため、係合部と係合することで弾性変形する雌ネジ部のネジ山を、突出部とネジ片との間に逃がすことができる。   According to the plunger rod according to the present invention, the protruding portion that protrudes from the outer peripheral portion of the base body is arranged between a plurality of screw pieces arranged in parallel so that the threads of the male screw portion are intermittently arranged. ing. And since the engaging part provided in a protrusion part is located in the thread groove of an external thread part, if an external thread part and an internal thread part screw together, an engaging part will engage with the thread of an internal thread part. Match. Furthermore, since the protruding portion is arranged away from each screw piece, the thread of the female screw portion that is elastically deformed by engaging with the engaging portion can be released between the protruding portion and the screw piece. it can.

また、本発明に係るプランジャーロッドにおいては、突出部は、対峙するように少なくとも一対設けられると共に、雌ネジ部のネジ山を挟持することで変形させるべく、対峙する面が平行となるように延設されてもよい。   Further, in the plunger rod according to the present invention, at least one pair of projecting portions are provided so as to face each other, and the facing surfaces are parallel to be deformed by sandwiching the thread of the female screw portion. It may be extended.

斯かる構成のプランジャーロッドによれば、突出部が対峙するように少なくとも一対設けられる。そして、対峙する面が平行となるように、突出部が延設されているため、一対の突出部が雌ネジ部のネジ山を挟持することで雌ネジ部のネジ山を変形させる。これにより、雌ネジ部のネジ山においては、変形した部位がネジ山を補強するリブとして機能するため、雌ネジ部のネジ山の剛性が向上し、その結果、例えば、ガスケットが雄ネジ部から抜けるのを防止できる。   According to the plunger rod having such a configuration, at least one pair is provided so that the protrusions face each other. And since the protrusion part is extended so that the surface which opposes may become parallel, a pair of protrusion part deform | transforms the thread of a female screw part by pinching the thread of a female screw part. Thereby, in the thread of the female thread part, the deformed portion functions as a rib for reinforcing the thread, so that the rigidity of the thread of the female thread part is improved. As a result, for example, the gasket is separated from the male thread part. It can be prevented from coming off.

また、本発明に係るプランジャーロッドにおいては、突出部は、基端側の面がベース体の軸心方向と直交するように延設されてもよい。   Moreover, in the plunger rod which concerns on this invention, a protrusion part may be extended so that the surface by the side of a base end may be orthogonal to the axial center direction of a base body.

斯かる構成のプランジャーロッドによれば、基端側の面がベース体の軸心方向と直交するように、突出部が延設されている。これにより、ガスケットとプランジャーロッドとが軸心方向で離反するように付勢された場合に、突出部の基端側の面が付勢された方向と直交しているため、突出部の基端側の面が雌ネジ部のネジ山を確実に係止でき、その結果、ガスケットが雄ネジ部から抜けるのを防止できる。   According to the plunger rod having such a configuration, the protruding portion is extended so that the surface on the base end side is orthogonal to the axial direction of the base body. As a result, when the gasket and the plunger rod are urged away from each other in the axial direction, the base end surface of the protrusion is perpendicular to the urged direction. The end-side surface can securely lock the thread of the female screw portion, and as a result, the gasket can be prevented from coming off from the male screw portion.

また、本発明に係るシリンジは、筒状のシリンジ本体と、雌ネジ部を有し、シリンジ本体内に挿入される弾性のガスケットと、前記プランジャーロッドとを備えることを特徴とする。   In addition, a syringe according to the present invention includes a cylindrical syringe body, an internal thread portion, an elastic gasket that is inserted into the syringe body, and the plunger rod.

以上の如く、本発明に係るプランジャーロッド及びシリンジによれば、プランジャーロッドの雄ネジ部とガスケットの雌ネジ部とが緩むのを防止できると共に、ガスケットのシール部が変形するのを抑制できるという優れた効果を奏する。   As described above, according to the plunger rod and the syringe according to the present invention, it is possible to prevent the male thread part of the plunger rod and the female thread part of the gasket from being loosened and to suppress the deformation of the seal part of the gasket. There is an excellent effect.

本発明の一実施形態に係るシリンジの全体図であって、（ａ）は正面図、（ｂ）はＡ−Ａ線における断面図を示す。BRIEF DESCRIPTION OF THE DRAWINGS It is a general view of the syringe which concerns on one Embodiment of this invention, Comprising: (a) is a front view, (b) shows sectional drawing in the AA line. 同実施形態に係るガスケットの全体図であって、（ａ）は正面図、（ｂ）はＢ−Ｂ線における断面図を示す。It is a general view of the gasket which concerns on the embodiment, Comprising: (a) is a front view, (b) shows sectional drawing in the BB line. 同実施形態に係るプランジャーロッドの全体図であって、（ａ）は平面図、（ｂ）は正面図、（ｃ）はＣ−Ｃ線における断面図、（ｄ）はＤ−Ｄ線における断面図を示す。It is a general view of the plunger rod which concerns on the same embodiment, Comprising: (a) is a top view, (b) is a front view, (c) is sectional drawing in CC line, (d) is in DD line A cross-sectional view is shown. 同実施形態に係るプランジャーロッドの要部図であって、（ａ）は図３（ｂ）のＥ領域の拡大図、（ｂ）はＦ−Ｆ線における断面図を示す。It is a principal part figure of the plunger rod which concerns on the same embodiment, Comprising: (a) is an enlarged view of E area | region of FIG.3 (b), (b) shows sectional drawing in the FF line. 同実施形態に係るプランジャーロッドにおける作用を説明する図であって、（ａ）及び（ｂ）はそれぞれ要部正面図を示す。It is a figure explaining the effect | action in the plunger rod which concerns on the same embodiment, Comprising: (a) And (b) shows the principal part front view, respectively. 本発明の他の実施形態に係るプランジャーロッドの要部図であって、（ａ）〜（ｃ）はそれぞれ正面図、（ｄ）はＧ−Ｇ線における断面図を示す。における断面図を示す。It is a principal part figure of the plunger rod which concerns on other embodiment of this invention, Comprising: (a)-(c) is a front view, respectively, (d) shows sectional drawing in GG line. FIG.

以下、本発明に係るシリンジ及びプランジャーロッドにおける一実施形態について、図１〜図５を参酌して説明する。   Hereinafter, an embodiment of a syringe and a plunger rod according to the present invention will be described with reference to FIGS.

シリンジは、図１〜図４に示すように、筒状のシリンジ本体１と、シリンジ本体１内の液体Ｘを封止すべく、シリンジ本体１内に挿入される弾性のガスケット２と、ガスケット２の雌ネジ部２１と螺合する雄ネジ部３１を有するプランジャーロッド３と、シリンジ本体１のノズル部１１を密閉するキャップ４とを備える。なお、プランジャーロッド３にガスケット２を結合したものをプランジャーという。   As shown in FIGS. 1 to 4, the syringe includes a cylindrical syringe body 1, an elastic gasket 2 inserted into the syringe body 1 to seal the liquid X in the syringe body 1, and a gasket 2. A plunger rod 3 having a male screw part 31 screwed with the female screw part 21 and a cap 4 for sealing the nozzle part 11 of the syringe body 1. In addition, what connected the gasket 2 to the plunger rod 3 is called plunger.

ここで、シリンジの各構成を説明するのに先立って、シリンジの製造方法について、概略を説明する。薬液充填済みシリンジ、所謂、プレフィルドシリンジは、キャップ４でノズル部１１が密閉されたシリンジ本体１内に、液体（薬液等）Ｘを充填し、さらに、ガスケット２を基端側からシリンジ本体１に挿入した後に、プランジャーロッド３をガスケット２に結合することで製造される。   Here, before explaining each structure of a syringe, an outline is demonstrated about the manufacturing method of a syringe. A so-called prefilled syringe filled with a chemical solution is filled with a liquid (chemical solution or the like) X in a syringe body 1 in which a nozzle portion 11 is sealed with a cap 4, and a gasket 2 is inserted into the syringe body 1 from the proximal end side. After the insertion, the plunger rod 3 is manufactured by joining to the gasket 2.

シリンジ本体１は、先端部がノズル部１１に連結される円筒状の胴部１２と、胴部１２の基端部に配置される板状のフランジ１３とを備える。そして、ノズル部１１は、胴部１２からテーパ状に突出し、例えば、針管のハブやコネクタ類等が嵌合（装着）される。また、フランジ１３は、プランジャーロッド３をシリンジ本体１に対して相対的に移動させる際に、指を掛けるのに用いられる。なお、シリンジ本体１は、剛性を有し、例えば、内視可能な透明なガラスや透明な硬質樹脂（プラスチック等）で形成されている。   The syringe body 1 includes a cylindrical body portion 12 having a distal end portion connected to the nozzle portion 11, and a plate-like flange 13 disposed at the proximal end portion of the body portion 12. And the nozzle part 11 protrudes from the trunk | drum 12 in a taper shape, for example, the hub, connector, etc. of a needle tube are fitted (attached). The flange 13 is used to hang a finger when the plunger rod 3 is moved relative to the syringe body 1. The syringe body 1 has rigidity, and is formed of, for example, transparent glass that can be viewed internally or a transparent hard resin (such as plastic).

ガスケット２は、先端側が閉塞される円筒状に形成され、雌ネジ部２１が内周部に形成されるガスケット本体２２と、シリンジ本体１の内周をシールすべく、ガスケット本体２２の外周部に周方向に沿って突出するシール部２３，２３，２３とを備える。そして、ガスケット２は、外径がシリンジ本体１（胴部１２）の内径に対応して設定されており、各シール部２３（或いはガスケット本体２２の外周部及び各シール部２３）が弾性変形（圧縮）されてシリンジ本体１（胴部１２）の内部と密着するように構成されている。   The gasket 2 is formed in a cylindrical shape whose front end is closed, and a gasket main body 22 in which an internal thread portion 21 is formed on the inner peripheral portion, and an outer peripheral portion of the gasket main body 22 to seal the inner periphery of the syringe main body 1. Seal portions 23, 23, 23 projecting along the circumferential direction are provided. The gasket 2 is set to have an outer diameter corresponding to the inner diameter of the syringe body 1 (body 12), and each seal portion 23 (or the outer peripheral portion of the gasket body 22 and each seal portion 23) is elastically deformed ( It is configured so as to be in close contact with the inside of the syringe body 1 (body portion 12).

雌ネジ部２１は、ガスケット本体２２の内周部から突出し、ガスケット本体２２の内周部に沿って螺旋状に配置されるネジ山（以下「雌ネジ山」ともいう）２１１と、雌ネジ山２１１間の軸心方向における空間であるネジ溝（以下「雌ネジ溝」ともいう）２１２とを備える。   The female screw portion 21 protrudes from the inner peripheral portion of the gasket body 22 and is spirally disposed along the inner peripheral portion of the gasket main body 22 (hereinafter also referred to as “female screw thread”) 211, and the female screw thread. 2, a screw groove (hereinafter also referred to as “female screw groove”) 212 which is a space in the axial direction between 211.

本実施形態においては、雌ネジ山２１１は、山頂（ネジ山の両側のフランク（面）を連絡する面）及び谷底（ネジ溝の両側のフランク（面）を連絡する面）に丸みの付いた丸ねじ形状としている。なお、ガスケット２は、弾性を有し、例えば、弾性樹脂（ゴム等）で形成されている。   In the present embodiment, the female thread 211 is rounded at the summit (surface connecting the flank (surface) on both sides of the screw thread) and the valley bottom (surface connecting the flank (surface) on both sides of the screw groove). Round screw shape. The gasket 2 has elasticity, and is made of, for example, an elastic resin (rubber or the like).

プランジャーロッド３は、長尺に形成されると共に長手方向に沿う凹部３２１を有するロッド本体３２と、ロッド本体３２の先端部に連結され、雄ネジ部３１が外周部に設けられる円柱状のベース体３３とを備える。また、プランジャーロッド３は、ベース体３３の外周部から突出する複数の突出部３４，…と、ロッド本体３２の基端部に配置される板状のフランジ３５とを備える。なお、プランジャーロッド３は、剛性を有し、例えば、硬質樹脂（プラスチック等）で形成されている。   The plunger rod 3 is formed in an elongated shape and has a rod body 32 having a recess 321 along the longitudinal direction, and a columnar base that is connected to the distal end portion of the rod body 32 and has a male screw portion 31 provided on the outer peripheral portion. And a body 33. The plunger rod 3 includes a plurality of projecting portions 34,... Projecting from the outer peripheral portion of the base body 33, and a plate-like flange 35 disposed at the proximal end portion of the rod main body 32. The plunger rod 3 has rigidity, and is formed of, for example, a hard resin (plastic or the like).

雄ネジ部３１は、ベース体３３の外周部から突出し、ベース体３３の外周部に沿って螺旋状に配置されるネジ山（以下「雄ネジ山」ともいう）３１１と、雄ネジ山３１１間の軸心方向における空間であるネジ溝（以下「雄ネジ溝」ともいう）３１２とを備える。本実施形態においては、雄ネジ山３１１は、山頂及び谷底に丸みの付いた丸ねじ形状としている。そして、雄ネジ山３１１は、複数のネジ片３１１ａ，…が並設されることにより、断続的に配置されている。   The male screw portion 31 protrudes from the outer peripheral portion of the base body 33 and is arranged between a screw thread 311 (hereinafter also referred to as “male screw thread”) spirally arranged along the outer peripheral portion of the base body 33 and the male screw thread 311. Screw grooves (hereinafter also referred to as “male screw grooves”) 312 which are spaces in the axial direction of In the present embodiment, the male thread 311 has a round thread shape with rounded peaks and valleys. The male thread 311 is intermittently arranged by arranging a plurality of screw pieces 311a,.

各突出部３４は、雌ネジ部２１の雌ネジ山２１１と係合すべく、雄ネジ部３１の雄ネジ溝３１２内に位置する係合部３４１を備える。そして、各突出部３４は、雄ネジ山３１１におけるネジ片３１１ａ，３１１ａ間に配置される。さらに、各突出部３４は、係合部３４１と係合することで弾性変形する雌ネジ部２１の雌ネジ山２１１を、ネジ片３１１ａとの間に逃がすべく、各ネジ片３１１ａと離間して配置される。   Each protrusion 34 includes an engaging portion 341 located in the male screw groove 312 of the male screw portion 31 so as to engage with the female screw thread 211 of the female screw portion 21. And each protrusion part 34 is arrange | positioned between the screw pieces 311a and 311a in the external thread 311. FIG. Furthermore, each protrusion 34 is separated from each screw piece 311a so that the female thread 211 of the female screw part 21 that is elastically deformed by engaging with the engaging part 341 is allowed to escape from the screw piece 311a. Be placed.

また、突出部３４，…は、ベース体３３の所定位置（正面側）で、軸心方向にて対峙するように一対並設されていると共に、その反対側の位置（背面側）でも、軸心方向にて対峙するように一対並設されている。そして、各一対の突出部３４，３４は、雌ネジ部２１の雌ネジ山２１１を挟持することで弾性変形させるべく、対峙する面が平行となるように延設されている。   Further, a pair of protrusions 34,... Are arranged in parallel so as to face each other in the axial direction at a predetermined position (front side) of the base body 33, and at the opposite side (back side), A pair is arranged side by side so as to confront each other in the center direction. And each pair of protrusion parts 34 and 34 are extended so that the surface which opposes may become parallel so that it may be elastically deformed by pinching the internal thread 211 of the internal thread part 21. FIG.

具体的には、各突出部３４は、一定の厚みを有する平板状に形成されると共に、外縁が軸心方向で雄ネジ山３１１の外縁（山頂）と一致するように円弧状に形成される。そして、各突出部３４は、先端側及び基端側の面がそれぞれベース体３３の軸心方向と直交するように配置されている。したがって、各突出部３４は、先端側及び基端側の面がそれぞれ雄ネジ山３１１の稜線と傾斜して交差するように配置されている。   Specifically, each protrusion 34 is formed in a flat plate shape having a constant thickness, and is formed in an arc shape so that the outer edge coincides with the outer edge (crest) of the male screw thread 311 in the axial direction. . The protrusions 34 are arranged such that the front end side and the base end side surfaces are orthogonal to the axial direction of the base body 33. Accordingly, the protrusions 34 are arranged such that the front end side and the base end side surfaces are inclined and intersect with the ridgeline of the male screw thread 311.

各係合部３４１は、ガスケット２がプランジャーロッド３から緩む方向（外れる方向）で回動する際に、雌ネジ山２１１を掛止する角部３４１ａを備える。なお、本実施形態においては、雌ネジ山２１１が雄ネジ山３１１の基端側のフランク（面）に密着するように設定されているため、係合部３４１は、雄ネジ溝３１２の先端側のみに配置されている。   Each engaging portion 341 includes a corner portion 341a that latches the female thread 211 when the gasket 2 rotates in a direction loosening (disengaging) from the plunger rod 3. In this embodiment, since the female thread 211 is set so as to be in close contact with the flank (surface) on the proximal end side of the male thread 311, the engaging portion 341 is provided on the distal end side of the male thread groove 312. Is only arranged.

以上より、本実施形態に係るシリンジ及びシリンダーロッド３によれば、雄ネジ山３１１において複数並設されているネジ片３１１ａ，３１１ａ間に、ベース体３３の外周部から突出する突出部３４が配置されている。そして、突出部３４に設けられる係合部３４１が雄ネジ溝３１２内に位置しているため、雄ネジ部３１と雌ネジ部２１とが螺合すると、図５に示すように、係合部３４１が雌ネジ山２１１と係合する。   As described above, according to the syringe and cylinder rod 3 according to the present embodiment, the protruding portion 34 protruding from the outer peripheral portion of the base body 33 is disposed between the screw pieces 311a and 311a arranged in parallel in the male screw thread 311. Has been. And since the engaging part 341 provided in the protrusion part 34 is located in the external thread groove 312, if the external thread part 31 and the internal thread part 21 are screwed together, as shown in FIG. 341 engages the female thread 211.

これにより、雌ネジ山２１１が径方向外方に向けて拡がる（潰れる）ように変形する一方で、係合部３４１には、雌ネジ山２１１の弾性力（復元力）が働く。したがって、雌ネジ山２１１が係合部３４１に食い込むため、プランジャーロッド３の雄ネジ部３１とガスケット２の雌ネジ部２１とが緩むのを防止できる。   As a result, the female thread 211 is deformed so as to expand (collapse) outward in the radial direction, while an elastic force (restoring force) of the female thread 211 acts on the engaging portion 341. Therefore, since the female thread 211 bites into the engaging part 341, it is possible to prevent the male thread part 31 of the plunger rod 3 and the female thread part 21 of the gasket 2 from being loosened.

なお、図５（ａ）においては、雄ネジ部３１と雌ネジ部２１とが螺合した際に、仮に、雌ネジ山２１１が弾性変形していない場合の位置を示すべく、円周方向に沿った断面形状の外縁を二点鎖線で示している。また、図５（ｂ）においては、雄ネジ部３１と雌ネジ部２１とが螺合した際に、雌ネジ山２１１が弾性変形している状態を示すべく、円周方向に沿った断面形状を実線及び斜線部で示している。   In FIG. 5A, when the male screw portion 31 and the female screw portion 21 are screwed together, in order to show the position when the female screw thread 211 is not elastically deformed, The outer edge of the cross-sectional shape along is shown with the dashed-two dotted line. 5B, the cross-sectional shape along the circumferential direction shows the state in which the female thread 211 is elastically deformed when the male thread 31 and the female thread 21 are screwed together. Is indicated by a solid line and a hatched part.

さらに、本実施形態に係るシリンジ及びシリンダーロッド３によれば、突出部３４が各ネジ片３１１ａと離間して配置されているため、係合部３４１と係合することで弾性変形した雌ネジ山２１１を、突出部３４１とネジ片３１１ａとの間に逃がすことができる。これにより、ガスケット２の各シール部２３が変形するのを抑制できる。しかも、雌ネジ山２１１が突出部３４１及びネジ片３１１ａ間に食い込むため、プランジャーロッド３の雄ネジ部３１とガスケット２の雌ネジ部２１とが緩むのを効果的に防止できる。   Furthermore, according to the syringe and cylinder rod 3 according to the present embodiment, since the projecting portion 34 is spaced apart from each screw piece 311a, the female screw thread elastically deformed by engaging with the engaging portion 341. 211 can escape between the protrusion 341 and the screw piece 311a. Thereby, it can suppress that each seal part 23 of gasket 2 changes. Moreover, since the female screw thread 211 bites between the protruding portion 341 and the screw piece 311a, it is possible to effectively prevent the male screw portion 31 of the plunger rod 3 and the female screw portion 21 of the gasket 2 from being loosened.

また、本実施形態に係るシリンジ及びプランジャーロッド３によれば、対峙する一対の突出部３４，３４の対峙する面が平行となるよう配置されているため、一対の突出部３４，３４の対峙する面が雌ネジ山２１１を挟持することにより、一対の突出部３４，３４が雌ネジ山２１１を弾性変形させる。   In addition, according to the syringe and plunger rod 3 according to the present embodiment, since the opposing surfaces of the pair of protruding portions 34, 34 facing each other are arranged in parallel, the opposing surfaces of the pair of protruding portions 34, 34 are opposed to each other. The holding surface sandwiches the female thread 211, so that the pair of protrusions 34 and 34 elastically deform the female thread 211.

これにより、雌ネジ山２１１においては、変形した部位がリブ（補強部）として機能するため、雌ネジ山２１１の剛性が向上する。したがって、プランジャーロッド３の雄ネジ部３１とガスケット２の雌ネジ部２１とが緩むのをさらに効果的に防止できたり、ガスケット２がプランジャーロッド３の雄ネジ部３１から抜けるのを防止できたりする。   Thereby, in the internal thread 211, since the deform | transformed site | part functions as a rib (reinforcement part), the rigidity of the internal thread 211 improves. Accordingly, it is possible to more effectively prevent the male threaded portion 31 of the plunger rod 3 and the female threaded portion 21 of the gasket 2 from being loosened, and to prevent the gasket 2 from coming off from the male threaded portion 31 of the plunger rod 3. Or

また、例えば、シリンジ本体１内にガスケット２が挿入された状態から、プランジャーロッド３を基端側に向けて引くと、シリンジ本体１及びガスケット２間に発生する摩擦力により、ガスケット２とプランジャーロッド３とが軸心方向で離反するように付勢される。   Further, for example, when the plunger rod 3 is pulled toward the proximal end side from the state in which the gasket 2 is inserted into the syringe body 1, the gasket 2 and the plan are caused by the frictional force generated between the syringe body 1 and the gasket 2. The jar rod 3 is biased so as to be separated in the axial direction.

しかしながら、本実施形態に係るシリンジ及びプランジャーロッド３によれば、突出部３４の基端側の面がベース体３３の軸心方向と直交して配置されているため、突出部３４の基端側の面が付勢される方向と直交している。したがって、突出部３４の基端側の面が雌ネジ山２１１を確実に係止できるため、ガスケット２が軸心方向でプランジャーロッド３の雄ネジ部３１から抜けるのを防止できる。   However, according to the syringe and the plunger rod 3 according to the present embodiment, the base end surface of the projecting portion 34 is disposed perpendicular to the axial direction of the base body 33, so The side surface is orthogonal to the direction in which the surface is biased. Therefore, the surface on the proximal end side of the projecting portion 34 can reliably lock the female thread 211, so that the gasket 2 can be prevented from coming off from the male thread portion 31 of the plunger rod 3 in the axial direction.

なお、本発明に係るシリンジ及びプランジャーロッドは、上記した実施の形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。また、下記する各種の変更例に係る構成や方法等を任意に選択して、上記した実施形態に係る構成や方法等に採用してもよいことは勿論である。   In addition, the syringe and plunger rod which concern on this invention are not limited to above-described embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention. Moreover, it is needless to say that configurations, methods, and the like according to various modifications described below may be arbitrarily selected and employed in the configurations, methods, and the like according to the above-described embodiments.

例えば、本発明に係るシリンジ及びプランジャーロッドは、ベース体３３から外方に向けて突出し、突出部３４とネジ片３１１ａとを連結する小突起片を備える場合でもよい。要するに、突出部３４とネジ片３１１ａとを連結する小突起片が設けられる場合でも、離間して配置される突出部３４とネジ片３１１ａとの間に、係合部３４１と係合することで弾性変形する雌ネジ山２１１が逃げることができるように構成されていればよい。   For example, the syringe and the plunger rod according to the present invention may be provided with a small protruding piece that protrudes outward from the base body 33 and connects the protruding portion 34 and the screw piece 311a. In short, even when a small protrusion piece that connects the protruding portion 34 and the screw piece 311a is provided, the engaging portion 341 is engaged between the protruding portion 34 and the screw piece 311a that are spaced apart from each other. What is necessary is just to be comprised so that the internal thread 211 which elastically deforms can escape.

また、上記実施形態に係るシリンジ及びプランジャーロッド３においては、突出部３４，３４が軸心方向にて対峙するように一対並設されている場合を説明したが、斯かる場合に限られない。具体的には、突出部は、対峙することなく複数設けられる場合でもよく、また、図６（ａ）に示すように、突出部３４ｂは、一つ設けられる場合でもよい。   Moreover, in the syringe and plunger rod 3 which concern on the said embodiment, although the case where the protrusion parts 34 and 34 were arranged in parallel so that it might oppose in an axial center direction was demonstrated, it is not restricted to such a case. . Specifically, a plurality of protrusions may be provided without facing each other, and as shown in FIG. 6A, one protrusion 34b may be provided.

また、上記実施形態に係るシリンジ及びプランジャーロッド３は、各突出部３４が板状に形成される場合を説明したが、斯かる場合に限られず、例えば、図６（ａ）に示すように、突出部３４ｂは、角柱状に形成される場合でもよい。   Moreover, although the syringe and plunger rod 3 which concern on the said embodiment demonstrated the case where each protrusion part 34 was formed in plate shape, it is not restricted to such a case, For example, as shown to Fig.6 (a) The protrusion 34b may be formed in a prismatic shape.

また、上記実施形態に係るシリンジ及びプランジャーロッド３においては、各突出部３４が雄ネジ溝３１２の先端側のみに係合部３４１を配置する場合を説明したが、斯かる場合に限られない。例えば、突出部は、雄ネジ溝３１２の基端側のみに、係合部を配置する場合でもよい。   Further, in the syringe and plunger rod 3 according to the above-described embodiment, the case has been described in which each protrusion 34 arranges the engaging portion 341 only at the distal end side of the male screw groove 312, but this is not the only case. . For example, the protruding portion may be a case where the engaging portion is disposed only on the proximal end side of the male screw groove 312.

さらに、図６（ｂ）に示すように、突出部３４ｃは、軸心方向の一方側に突出することで、雄ネジ溝３１２の先端側及び基端側の双方に、係合部３４１ｃを配置する場合でもよい。加えて、また、図６（ｃ）に示すように、突出部３４ｄは、軸心方向の両方側にそれぞれ突出することで、雄ネジ溝３１２の先端側及び基端側の双方に、係合部３４１ｄ，３４１ｄを配置する場合でもよい。   Further, as shown in FIG. 6B, the protruding portion 34c protrudes to one side in the axial direction, thereby disposing the engaging portions 341c on both the distal end side and the proximal end side of the male screw groove 312. You may do it. In addition, as shown in FIG. 6 (c), the protruding portion 34 d is engaged with both the distal end side and the proximal end side of the male screw groove 312 by projecting to both sides in the axial direction. The parts 341d and 341d may be arranged.

また、上記実施形態に係るシリンジ及びプランジャーロッド３は、各突出部３４が周方向（螺旋方向）において一定の厚みで形成される場合を説明したが、斯かる場合に限られず、突出部は、雄ネジ山３１１の先端側から基端側に沿って、テーパ状に形成される場合でもよい。例えば、突出部は、三角形状に形成される場合でもよく、また、図６（ｃ）に示すように、突出部３４ｄは、台形状に形成される場合でもよい。   Moreover, although the syringe and plunger rod 3 which concern on the said embodiment demonstrated the case where each protrusion part 34 was formed with fixed thickness in the circumferential direction (spiral direction), it is not restricted to such a case, A protrusion part is Further, it may be formed in a tapered shape from the distal end side to the proximal end side of the male screw thread 311. For example, the protruding portion may be formed in a triangular shape, and as shown in FIG. 6C, the protruding portion 34d may be formed in a trapezoidal shape.

斯かる構成によれば、ガスケットをプランジャーロッドに取り付ける際に、ガスケットを締める方向に回転させても、テーパ状である突出部３４ｄがそれほど抵抗とはならない。その上、ガスケットがプランジャーロッドに取り付けられた後、ガスケットが緩む方向に回転しようとしても、突出部３４ｄの係合部３４１ｄが雌ネジ山２１１と係合するため、プランジャーロッドの雄ネジ部３１とガスケットの雌ネジ部２１とが緩むのを防止できる。   According to such a configuration, even when the gasket is attached to the plunger rod, even if the gasket 34 is rotated in the tightening direction, the tapered projecting portion 34d is not so resistant. Furthermore, after the gasket is attached to the plunger rod, the engaging portion 341d of the projecting portion 34d is engaged with the female thread 211 even if the gasket is rotated in the loosening direction. 31 and the female threaded portion 21 of the gasket can be prevented from loosening.

また、上記実施形態に係るシリンジ及びプランジャーロッド３においては、突出部３４の外縁が軸心方向で雄ネジ山３１１の外縁と一致するように円弧状に形成される場合を説明したが、斯かる場合に限られない。例えば、図６（ｄ）に示すように、突出部３４ｅは、雄ネジ山３１１よりも大径に形成され、径方向において雄ネジ山３１１の山頂よりも外方に位置する係止部３４２ｅを備える場合でもよい。   In the syringe and plunger rod 3 according to the above embodiment, the case where the outer edge of the protrusion 34 is formed in an arc shape so as to coincide with the outer edge of the male thread 311 in the axial direction has been described. It is not limited to the case. For example, as shown in FIG. 6D, the protrusion 34e is formed to have a larger diameter than the male thread 311 and a locking part 342e positioned outward from the top of the male thread 311 in the radial direction. It may be provided.

斯かる構成によれば、ガスケットがプランジャーロッドに取り付けられると、係止部３４２ｅが雌ネジ溝２１２を径方向外方に拡げるように弾性変形させるため、雌ネジ溝２１２が弾性力（復元力）により係止部３４２ｅに食い込み、その結果、プランジャーロッドの雄ネジ部３１とガスケットの雌ネジ部２１とが緩むのを防止できる。   According to such a configuration, when the gasket is attached to the plunger rod, the engaging portion 342e elastically deforms the female screw groove 212 so as to expand radially outward, so that the female screw groove 212 has an elastic force (restoring force). ) Bite into the locking portion 342e, and as a result, the male screw portion 31 of the plunger rod and the female screw portion 21 of the gasket can be prevented from loosening.

また、上記実施形態に係るシリンジは、雄ネジ部３１のベース体３３が円柱状に形成される場合を説明したが、斯かる場合に限られず、例えば、ベース体は、円筒状に形成され、ガスケット本体から軸心方向の内方に突出する突起部を外嵌合する場合でもよい。   Moreover, although the syringe which concerns on the said embodiment demonstrated the case where the base body 33 of the external thread part 31 was formed in a column shape, it is not restricted to such a case, For example, a base body is formed in a cylindrical shape, A protrusion that protrudes inward in the axial direction from the gasket body may be externally fitted.

また、上記実施形態に係るシリンジは、液体Ｘが充填されている場合を説明したが、斯かる場合に限られず、液体Ｘが充填されていない場合でもよい。   Moreover, although the case where the syringe which concerns on the said embodiment was filled with the liquid X was demonstrated, it is not restricted to such a case, The case where the liquid X is not filled may be sufficient.

１…シリンジ本体、２…ガスケット、３…プランジャーロッド、２１…雌ネジ部、３１…雄ネジ部、３３…ベース体、３４、３４ｂ、３４ｃ、３４ｄ、３４ｅ…突出部、２１１…（雌）ネジ山、２１２…（雌）ネジ溝、３１１（雄）ネジ山、３１１ａ…ネジ片、３１２…（雄）ネジ溝、３４１、３４１ｂ、３４１ｃ、３４１ｄ…係合部   DESCRIPTION OF SYMBOLS 1 ... Syringe main body, 2 ... Gasket, 3 ... Plunger rod, 21 ... Female screw part, 31 ... Male screw part, 33 ... Base body, 34, 34b, 34c, 34d, 34e ... Projection part, 211 ... (female) Screw thread, 212 ... (female) screw groove, 311 (male) screw thread, 311a ... screw piece, 312 ... (male) screw groove, 341, 341b, 341c, 341d ... engagement portion

Claims (4)

弾性を有するガスケットの雌ネジ部と螺合する雄ネジ部を先端部に備え、
雄ネジ部は、円柱状又は円筒状に形成されるベース体の外周部に、螺旋状に延設されるネジ山を備え、
ネジ山は、複数のネジ片が並設されることにより、断続的に配置されるプランジャーロッドであって、
ネジ山の延びる方向で、該ネジ山を構成するネジ片と同列となる様にネジ片間に配置された突出部であって、ベース体の外周部から突出する突出部を備え、
突出部は、雌ネジ部のネジ山と係合すべく、雄ネジ部のネジ溝内に位置する係合部を備えると共に、係合部と係合することで弾性変形する雌ネジ部のネジ山を、ネジ片との間に逃がすべく、各ネジ片と離間して配置されることを特徴とするプランジャーロッド。 Provided with a male screw part screwed into the female screw part of the gasket having elasticity at the tip,
The male screw portion includes a screw thread extending in a spiral shape on the outer peripheral portion of the base body formed in a columnar shape or a cylindrical shape,
The screw thread is a plunger rod that is intermittently arranged by arranging a plurality of screw pieces in parallel,
A protrusion disposed between the screw pieces so as to be in the same row as the screw pieces constituting the screw thread in a direction in which the screw threads extend, and includes a protrusion protruding from the outer peripheral portion of the base body;
The protruding portion includes an engaging portion positioned in the thread groove of the male screw portion to be engaged with the thread of the female screw portion, and the screw of the female screw portion that is elastically deformed by being engaged with the engaging portion. A plunger rod, wherein the plunger rod is spaced apart from each screw piece so as to allow the mountain to escape between the screw pieces. 突出部は、対峙するように少なくとも一対設けられると共に、雌ネジ部のネジ山を挟持することで変形させるべく、対峙する面が平行となるように延設される請求項１に記載のプランジャーロッド。   2. The plunger according to claim 1, wherein at least one pair of the projecting portions are provided so as to face each other, and the facing surfaces are extended in parallel so as to be deformed by sandwiching the thread of the female screw portion. rod. 突出部は、基端側の面がベース体の径方向と平行になるように延設される請求項１又は２に記載のプランジャーロッド。   3. The plunger rod according to claim 1, wherein the projecting portion extends so that a surface on the base end side is parallel to a radial direction of the base body. 筒状のシリンジ本体と、雌ネジ部を有し、シリンジ本体内に挿入される弾性のガスケットと、請求項１〜３の何れか１項に記載のプランジャーロッドとを備えることを特徴とするシリンジ。   It has a cylindrical syringe main body, an internal thread part, the elastic gasket inserted in a syringe main body, and the plunger rod of any one of Claims 1-3, It is characterized by the above-mentioned. Syringe.
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JPWO2015012206A1 (en) * 2013-07-22 2017-03-02 ニプロ株式会社 Gasket and plunger, syringe and prefilled syringe using the same
GB201616398D0 (en) * 2016-09-27 2016-11-09 Owen Mumford Ltd Syringe plunger rod
JP7051594B2 (en) * 2018-06-05 2022-04-11 株式会社ジェイ・エム・エス Plunger for prefilled syringe and prefilled syringe
JP7424999B2 (en) * 2018-06-21 2024-01-30 ウエスト ファーマスーティカル サービシーズ インコーポレイテッド Plunger with improved thread shape and its rod

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JP4253763B2 (en) * 2003-06-13 2009-04-15 日本シャーウッド株式会社 Lock ring loosening prevention mechanism and medical device using the same
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