JP3623942B2 - Piston head and syringe - Google Patents

Piston head and syringe Download PDF

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Publication number
JP3623942B2
JP3623942B2 JP2002040066A JP2002040066A JP3623942B2 JP 3623942 B2 JP3623942 B2 JP 3623942B2 JP 2002040066 A JP2002040066 A JP 2002040066A JP 2002040066 A JP2002040066 A JP 2002040066A JP 3623942 B2 JP3623942 B2 JP 3623942B2
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Prior art keywords
diaphragm
piston head
piston
seal
cylinder
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JP2003235974A (en
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和正 増田
正博 榊原
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Nemoto Kyorindo Co Ltd
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Nemoto Kyorindo 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
    • A61M5/31513—Piston constructions to improve sealing or sliding

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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

【０００１】
【発明の属する技術分野】
本発明は、シリンダ部材に挿入されるピストン部材の先端に装着されるピストンヘッドに関し、特に、シリンジに利用されるピストンヘッドに関する。
【０００２】
【従来の技術】
現在、医療現場でＣＴ（Ｃｏｍｐｕｔｅｄ Ｔｏｍｏｇｒａｐｈｙ）スキャナやＭＲＩ（Ｍａｇｎｅｔｉｃ Ｒｅｓｏｎａｎｃｅ Ｉｍａｇｉｎｇ）装置により被験者の断層画像を撮像するとき、その被験者にシリンジから造影剤や生理食塩水などの薬液を注入することがある。一般的なシリンジ１０は、図１２に示すように、ピストン部材１１の先端にピストンヘッド１２が装着されており、これがシリンダ部材１３の円筒形の孔部１４にスライド自在に挿入されている。
【０００３】
ピストン部材１１とシリンダ部材１３とは、機械強度を確保できる硬質な樹脂などで形成されており、ピストンヘッド１２は、シリンダ部材１３の孔部１４をスライド自在な状態で密閉するために柔軟なシリコンゴムなどで形成されている。そこで、薬液が充填されたシリンダ部材１３の孔部１４をピストンヘッド１２で密閉した状態からピストン部材１１を押圧すると、ピストンヘッド１２の移動により加圧される薬液がシリンダ部材１３の先端の小孔１５から吐出される。
【０００４】
【発明が解決しようとする課題】
上述のようなシリンジ１０では、ピストンヘッド１２はシリンダ部材１３の孔部１４をピストンヘッド１２で密閉しながらスライドする必要があるので、その密閉性が不足しがちで薬液が漏出することがある。特に、前述のようにＣＴスキャナなどを使用する医療現場では、シリンジ１０から被験者に薬液として造影剤を注入するが、その造影剤は一般的な薬液より高粘度である。
【０００５】
このため、手動でピストン部材１１を押圧することが困難であり、シリンジ１０のピストン部材１１を機械的に押圧する薬液注入装置も利用されている。しかし、この薬液注入装置はピストン部材１１を手動の場合より強力に押圧するため、さらに薬液が漏出しやすい。
【０００６】
本発明は上述のような課題に鑑みてなされたものであり、シリンジの薬液の漏出を良好に防止することができるピストンヘッドを提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明のピストンヘッドは、従来のようなムク材で形成されておらず、少なくともベース部材とダイヤフラム部材とシール部材からなる。硬質なベース部材がピストン部材の先端に位置し、柔軟なシール部材がダイヤフラム部材の外周面上でシリンダ部材に密着する。ダイヤフラム部材はベース部材より柔軟でシール部材より硬質であり、ベース部材とシール部材との間に位置する。ダイヤフラム部材は後方に押圧されると外周方向に拡開するので、シリンダ部材の内圧が上昇するとシール部材がシリンダ部材に密着する圧力も向上する。
【０００８】
なお、本発明ではシリンダ部材にピストン部材が挿入される方向を前方と想定し、前後方向を言及しているが、これは方向の相対関係を簡単に説明するために便宜的に規定したものであり、本発明を実施する場合の製造時および使用時の方向を限定するものではない。
【０００９】
また、本発明を製品として実施する場合、本発明で云う各種の構成要素は、必ずしも個々に独立した部品である必要はない。例えば、複数の構成要素が１個の部品として形成されていること、ある構成要素が他の構成要素の一部であること、ある構成要素の一部と他の構成要素の一部とが重複していること、等も可能である。
【００１０】
【発明の実施の形態】
［第１の形態の構成］
本発明の実施の第１の形態を図１ないし図４を参照して以下に説明する。ただし、本形態に関して前述した一従来例と同一の部分は、同一の名称および符号を使用して詳細な説明は省略する。
【００１１】
本形態のピストンヘッド２０も従来のピストンヘッド１２と同様に、図３に示すように、シリンジ４０の一部からなり、ピストン部材１１の先端に位置してシリンダ部材１３の孔部１４を密閉する。しかし、本形態のピストンヘッド２０は従来のピストンヘッド１２とは異なり、図１および図２に示すように、ベース部材２１、ダイヤフラム部材２２、シール部材２３、からなる。
【００１２】
ベース部材２１は、硬質な樹脂で形成されており、ピストン部材１１の先端に固定されている。ダイヤフラム部材２２は、ベース部材２１より柔軟な樹脂で形成されており、ベース部材２１の前面に固定されることなく配置されている。シール部材２３は、ダイヤフラム部材２２より柔軟なシリコンゴムで形成されており、ダイヤフラム部材２２の前面上から外周面上まで位置してベース部材２１の外周面上に装着されている。
【００１３】
より詳細には、ベース部材２１の前面の外側には、前方に集束する円錐面２５が形成されており、この円錐面２５に当接する円錐面２６が、ダイヤフラム部材２２の後面の外側に形成されている。ダイヤフラム部材２２の前面には前方に集束する円錐面２７が形成されており、この円錐面２７に密着する円錐面２８が、シール部材２３の後面に形成されている。
【００１４】
このシール部材２３は、後縁部２９が内側に曲折された形状に形成されており、この後縁部２９が係合する凹部３０がベース部材２１の外周面に形成されている。このため、シール部材２３は、その後面に密着するダイヤフラム部材２２をベース部材２１の前面に密着させる状態で、このベース部材２１に装着されている。このように装着されたシール部材２３の外周部分は、ダイヤフラム部材２２およびベース部材２１の外周面上に位置するので、図３に示すように、シリンダ部材１３の孔部１４の内周面に密着する。
【００１５】
［第１の形態の動作］
上述のような構成において、本形態のシリンジ４０でも、ピストン部材１１の先端に位置するピストンヘッド２０がシリンダ部材１３の孔部１４に密着しているので、ピストン部材１１を押圧することでシリンダ部材１３に充填されている薬液を吐出させることができる。
【００１６】
このとき、本形態のピストンヘッド２０は、図４に示すように、シリンダ部材１３の内圧が上昇してシール部材２３とともにダイヤフラム部材２２の前面が後方に押圧されると、このダイヤフラム部材２２がベース部材２１の円錐面２５上を後方にスライドする。
【００１７】
すると、ダイヤフラム部材２２がシール部材２３とともに外周方向に拡開するので、シール部材２３がシリンダ部材１３の孔部１４に密着する圧力が上昇する。つまり、本形態のシリンジ４０では、シリンダ部材１３の内圧が上昇するとピストンヘッド２０が外周方向に拡開するので、ピストン部材１１を高圧に押圧しても薬液が漏出しにくい。
【００１８】
［第２の形態の構成］
つぎに、本発明の実施の第２の形態を図５および図６を参照して以下に説明する。なお、この実施の第２の形態に関して上述した第１の形態と同一の部分は、同一の名称および符号を使用して詳細な説明は省略する。本形態のピストンヘッド５０は、同図に示すように、ベース部材５１、ダイヤフラム部材５２、プッシャ部材５３、シール部材５４、からなる。
【００１９】
本形態のピストンヘッド５０では、プッシャ部材５３は、ダイヤフラム部材５２より硬質な樹脂で形成されており、ダイヤフラム部材５２の前面に固定されることなく配置されている。シール部材５４は、ダイヤフラム部材５２より柔軟なシリコンゴムで形成されており、プッシャ部材５３の前面上からダイヤフラム部材５２の外周面上を介してベース部材５１の外周面上まで装着されている。
【００２０】
より詳細には、ベース部材５１の前面は平面５６に形成されており、この平面５６に当接する平面５７がダイヤフラム部材５２の後面に形成されている。このダイヤフラム部材５２の前面の外側には後方に集束する円錐面５８が形成されており、この円錐面５８に当接する円錐面５９が、プッシャ部材５３の後面の外側に形成されている。
【００２１】
［第２の形態の動作］
上述のような構成において、本形態のピストンヘッド５０は、シール部材５４とともにプッシャ部材５３の前面が後方に押圧されると、このプッシャ部材５３の円錐面５９でダイヤフラム部材５２の円錐面５８が後方に押圧される。すると、このダイヤフラム部材５２がシール部材５４とともに外周方向に拡開するので、シール部材５４がシリンダ部材１３の孔部１４に密着する圧力が上昇する。つまり、本形態のシリンジ４０も、シリンダ部材１３の内圧が上昇するとピストンヘッド５０が外周方向に拡開するので、ピストン部材１１を高圧に押圧しても薬液が漏出しにくい。
【００２２】
［実施の形態の変形例］
本発明は上記形態に限定されるものではなく、その要旨を逸脱しない範囲で各種の変形を許容する。例えば、実施の第２の形態のピストンヘッド５０では、ベース部材５１の前面とダイヤフラム部材５２の後面とが平面５６，５７に形成されており、後方に集束する円錐面５８，５９がダイヤフラム部材５２の前面とプッシャ部材５３の後面とに形成されていることを例示した。
【００２３】
しかし、図７に例示するピストンヘッド６０のように、前方に集束する円錐面６１，６２がベース部材６３の前面とダイヤフラム部材６４の後面とに形成されており、ダイヤフラム部材６４の前面とプッシャ部材６５の後面とが平面６６，６７に形成されていることも可能である。
【００２４】
さらに、図８に例示するピストンヘッド７０のように、前方に集束する円錐面６１，６２がベース部材６３の前面とダイヤフラム部材７１の後面とに形成されており、後方に集束する円錐面５８，５９がダイヤフラム部材７１の前面とプッシャ部材５３の後面とに形成されていることも可能である。
【００２５】
また、前述のピストンヘッド２０，５０等では、各種の部品が別個に形成されていることを例示したが、本発明のピストンヘッドは、前面が後方に押圧されることで外周方向に拡開する構造であれば、複数の部品の一部が一体化されていることも可能である。
【００２６】
例えば、図９に例示するピストンヘッド８０のように、上述したピストンヘッド６０のプッシャ部材６５とシール部材５４とを一体に形成してシール部材８１とすることも可能である。また、全部のピストンヘッド２０，５０，６０，７０，８０において、そのベース部材２１等はシリンジ４０のピストン部材１１と一体に形成することが可能である。
【００２７】
さらに、前述のピストンヘッド２０，５０等では、薬液の漏出を確実に防止するためにシール部材２３等が前面の全域に位置する構造を例示したが、例えば、図１０に例示するピストンヘッド９０のように、シール部材９１がダイヤフラム部材２２の外周面上にのみ位置することも可能である。
【００２８】
また、前述のピストンヘッド２０では、ダイヤフラム部材２２が略円錐形に形成されていることを例示したが、例えば、図１１に示すように、ダイヤフラム部材１００に複数の切り欠き１０１を放射方向に形成することで、その外周方向への拡開を容易とすることも可能である。
【００２９】
【発明の効果】
本発明のピストンヘッドは、前面が後方に押圧されると外周方向に拡開することにより、シリンジのピストン部材の先端に位置する状態で、シリンダ部材の内圧が上昇するとシール部材がシリンダ部材に密着する圧力も向上するので、薬液の漏出を良好に防止することができる。
【図面の簡単な説明】
【図１】本発明の実施の第１の形態のピストンヘッドの組立構造を示す半断面図である。
【図２】ピストンヘッドの組立構造を示す分解斜視図である。
【図３】シリンジを示す半断面図である。
【図４】ダイヤフラム部材の作用を示す模式図である。
【図５】本発明の実施の第２の形態のピストンヘッドの組立構造を示す半断面図である。
【図６】ピストンヘッドの組立構造を示す分解斜視図である。
【図７】第１の変形例のピストンヘッドの組立構造を示す断面図である。
【図８】第２の変形例のピストンヘッドの組立構造を示す断面図である。
【図９】第３の変形例のピストンヘッドの組立構造を示す断面図である。
【図１０】第４の変形例のピストンヘッドの組立構造を示す断面図である。
【図１１】第５の変形例のダイヤフラム部材の外観を示す正面図である。
【図１２】一従来例のシリンジを示す半断面図である。
【符号の説明】
１１ ピストン部材
１３ シリンダ部材
１４ 孔部
２０，５０，６０，７０，８０，９０ ピストンヘッド
２１，５１，６３ ベース部材
２２，５２，６４，７１，１００ ダイヤフラム部材
２３，５４，８１，９１ シール部材
２５，２６，５８，５９，６１，６２ 円錐面
１０１ 切り欠き[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a piston head attached to the tip of a piston member inserted into a cylinder member, and more particularly to a piston head used for a syringe.
[0002]
[Prior art]
Currently, when a tomographic image of a subject is captured by a CT (Computed Tomography) scanner or an MRI (Magnetic Resonance Imaging) device at a medical site, a medical solution such as a contrast medium or saline may be injected into the subject from a syringe. As shown in FIG. 12, the general syringe 10 has a piston head 12 attached to the tip of a piston member 11, which is slidably inserted into a cylindrical hole portion 14 of the cylinder member 13.
[0003]
The piston member 11 and the cylinder member 13 are made of a hard resin or the like that can ensure mechanical strength. The piston head 12 is made of flexible silicon to seal the hole 14 of the cylinder member 13 in a slidable state. It is made of rubber. Therefore, when the piston member 11 is pressed from the state in which the hole 14 of the cylinder member 13 filled with the chemical liquid is sealed with the piston head 12, the chemical liquid pressurized by the movement of the piston head 12 is a small hole at the tip of the cylinder member 13. 15 is discharged.
[0004]
[Problems to be solved by the invention]
In the syringe 10 as described above, the piston head 12 needs to slide while the hole 14 of the cylinder member 13 is sealed with the piston head 12, so that the sealing performance tends to be insufficient and the chemical solution may leak. In particular, in the medical field where a CT scanner or the like is used as described above, a contrast agent is injected as a chemical solution from the syringe 10 to the subject, and the contrast agent has a higher viscosity than a general chemical solution.
[0005]
For this reason, it is difficult to manually press the piston member 11, and a chemical liquid injector that mechanically presses the piston member 11 of the syringe 10 is also used. However, since this chemical injection device presses the piston member 11 more strongly than in the case of manual operation, the chemical is more likely to leak.
[0006]
This invention is made | formed in view of the above subjects, and it aims at providing the piston head which can prevent the leakage of the chemical | medical solution of a syringe favorably.
[0007]
[Means for Solving the Problems]
The piston head of the present invention is not formed of a conventional bulk material, and includes at least a base member, a diaphragm member, and a seal member. A rigid base member is positioned at the tip of the piston member, and a flexible seal member is in close contact with the cylinder member on the outer peripheral surface of the diaphragm member. The diaphragm member is rigid than flexible sealing member from the base member, located between the base member and the seal member. When the diaphragm member is pressed rearward, the diaphragm member expands in the outer circumferential direction. Therefore, when the internal pressure of the cylinder member increases, the pressure at which the seal member comes into close contact with the cylinder member is also improved.
[0008]
In the present invention, the direction in which the piston member is inserted into the cylinder member is assumed to be the front, and the front-rear direction is referred to. However, this is defined for convenience in order to briefly explain the relative relationship between the directions. There is no limitation on the direction of manufacture and use when the present invention is carried out.
[0009]
When the present invention is implemented as a product, the various components referred to in the present invention do not necessarily have to be independent parts. For example, a plurality of components are formed as one part, a certain component is a part of another component, a part of a certain component overlaps a part of another component And so on.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
[Configuration of the first embodiment]
A first embodiment of the present invention will be described below with reference to FIGS. However, the same parts as those of the conventional example described above with respect to the present embodiment are denoted by the same names and symbols, and detailed description thereof is omitted.
[0011]
As in the conventional piston head 12, the piston head 20 of this embodiment also comprises a part of the syringe 40 as shown in FIG. 3, and is positioned at the tip of the piston member 11 to seal the hole 14 of the cylinder member 13. . However, unlike the conventional piston head 12, the piston head 20 of this embodiment includes a base member 21, a diaphragm member 22, and a seal member 23 as shown in FIGS. 1 and 2.
[0012]
The base member 21 is made of a hard resin and is fixed to the tip of the piston member 11. The diaphragm member 22 is formed of a softer resin than the base member 21 and is disposed without being fixed to the front surface of the base member 21. The seal member 23 is formed of a silicone rubber that is more flexible than the diaphragm member 22, and is mounted on the outer peripheral surface of the base member 21 so as to be positioned from the front surface to the outer peripheral surface of the diaphragm member 22.
[0013]
More specifically, a conical surface 25 that converges forward is formed outside the front surface of the base member 21, and a conical surface 26 that contacts the conical surface 25 is formed outside the rear surface of the diaphragm member 22. ing. A conical surface 27 that converges forward is formed on the front surface of the diaphragm member 22, and a conical surface 28 that is in close contact with the conical surface 27 is formed on the rear surface of the seal member 23.
[0014]
The seal member 23 is formed in a shape in which a rear edge portion 29 is bent inward, and a concave portion 30 with which the rear edge portion 29 is engaged is formed on the outer peripheral surface of the base member 21. For this reason, the seal member 23 is attached to the base member 21 in a state in which the diaphragm member 22 that is in close contact with the rear surface thereof is in close contact with the front surface of the base member 21. Since the outer peripheral portion of the seal member 23 thus mounted is located on the outer peripheral surfaces of the diaphragm member 22 and the base member 21, as shown in FIG. 3, the outer peripheral portion is in close contact with the inner peripheral surface of the hole 14 of the cylinder member 13. To do.
[0015]
[Operation of the first form]
In the configuration as described above, even in the syringe 40 of the present embodiment, the piston head 20 located at the tip of the piston member 11 is in close contact with the hole 14 of the cylinder member 13. 13 can be discharged.
[0016]
At this time, as shown in FIG. 4, when the internal pressure of the cylinder member 13 rises and the front surface of the diaphragm member 22 is pressed rearward together with the seal member 23, the piston member 20 of this embodiment forms the base of the diaphragm member 22. Slide backward on the conical surface 25 of the member 21.
[0017]
As a result, the diaphragm member 22 expands in the outer circumferential direction together with the seal member 23, so that the pressure at which the seal member 23 comes into close contact with the hole 14 of the cylinder member 13 increases. That is, in the syringe 40 of this embodiment, when the internal pressure of the cylinder member 13 rises, the piston head 20 expands in the outer peripheral direction, so that even if the piston member 11 is pressed to a high pressure, the chemical liquid is difficult to leak.
[0018]
[Configuration of Second Embodiment]
Next, a second embodiment of the present invention will be described below with reference to FIGS. The same parts as those in the first embodiment described above with respect to the second embodiment are denoted by the same names and reference numerals, and detailed description thereof is omitted. As shown in the figure, the piston head 50 of this embodiment includes a base member 51, a diaphragm member 52, a pusher member 53, and a seal member 54.
[0019]
In the piston head 50 of this embodiment, the pusher member 53 is made of a resin harder than the diaphragm member 52 and is disposed without being fixed to the front surface of the diaphragm member 52. The seal member 54 is formed of silicon rubber that is more flexible than the diaphragm member 52, and is mounted from the front surface of the pusher member 53 to the outer peripheral surface of the base member 51 via the outer peripheral surface of the diaphragm member 52.
[0020]
More specifically, the front surface of the base member 51 is formed on a flat surface 56, and a flat surface 57 that contacts the flat surface 56 is formed on the rear surface of the diaphragm member 52. A conical surface 58 that converges rearward is formed outside the front surface of the diaphragm member 52, and a conical surface 59 that contacts the conical surface 58 is formed outside the rear surface of the pusher member 53.
[0021]
[Operation of the second form]
In the configuration as described above, when the front surface of the pusher member 53 is pressed rearward together with the seal member 54, the piston head 50 according to the present embodiment causes the conical surface 59 of the diaphragm member 52 to move backward with the conical surface 59 of the pusher member 53. Pressed. As a result, the diaphragm member 52 expands in the outer circumferential direction together with the seal member 54, so that the pressure at which the seal member 54 comes into close contact with the hole 14 of the cylinder member 13 increases. That is, also in the syringe 40 of this embodiment, the piston head 50 expands in the outer peripheral direction when the internal pressure of the cylinder member 13 rises, so that even if the piston member 11 is pressed to a high pressure, the chemical liquid is difficult to leak.
[0022]
[Modification of Embodiment]
The present invention is not limited to the above embodiment, and various modifications are allowed without departing from the scope of the present invention. For example, in the piston head 50 of the second embodiment, the front surface of the base member 51 and the rear surface of the diaphragm member 52 are formed on the flat surfaces 56 and 57, and the conical surfaces 58 and 59 converging rearward are formed on the diaphragm member 52. It is illustrated that it is formed on the front surface and the rear surface of the pusher member 53.
[0023]
However, like the piston head 60 illustrated in FIG. 7, conical surfaces 61 and 62 converging forward are formed on the front surface of the base member 63 and the rear surface of the diaphragm member 64, and the front surface of the diaphragm member 64 and the pusher member are formed. It is also possible that the rear surface of 65 is formed on the flat surfaces 66 and 67.
[0024]
Further, like the piston head 70 illustrated in FIG. 8, conical surfaces 61 and 62 converging forward are formed on the front surface of the base member 63 and the rear surface of the diaphragm member 71. 59 may be formed on the front surface of the diaphragm member 71 and the rear surface of the pusher member 53.
[0025]
Moreover, in the above-described piston heads 20, 50, etc., it is exemplified that various components are separately formed. However, the piston head of the present invention expands in the outer circumferential direction when the front surface is pressed backward. If it is a structure, it is also possible that some of several components are integrated.
[0026]
For example, like the piston head 80 illustrated in FIG. 9, the pusher member 65 and the seal member 54 of the piston head 60 described above can be integrally formed to be the seal member 81. Further, in all the piston heads 20, 50, 60, 70 and 80, the base member 21 and the like can be formed integrally with the piston member 11 of the syringe 40.
[0027]
Further, in the above-described piston heads 20, 50, etc., the structure in which the seal member 23, etc. is located in the entire front surface in order to reliably prevent the leakage of the chemical solution is exemplified. Thus, the seal member 91 can be located only on the outer peripheral surface of the diaphragm member 22.
[0028]
In the piston head 20 described above, the diaphragm member 22 is illustrated as having a substantially conical shape. For example, as shown in FIG. 11, a plurality of notches 101 are formed in the diaphragm member 100 in the radial direction. By doing so, it is also possible to facilitate the expansion in the outer circumferential direction.
[0029]
【The invention's effect】
The piston head of the present invention expands in the outer circumferential direction when the front surface is pressed rearward, so that when the internal pressure of the cylinder member rises in a state where it is positioned at the tip of the piston member of the syringe, the seal member comes into close contact with the cylinder member Therefore, the leakage of the chemical solution can be prevented well.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing an assembly structure of a piston head according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view showing an assembly structure of a piston head.
FIG. 3 is a half sectional view showing a syringe.
FIG. 4 is a schematic diagram showing the action of a diaphragm member.
FIG. 5 is a half sectional view showing an assembly structure of a piston head according to a second embodiment of the present invention.
FIG. 6 is an exploded perspective view showing an assembly structure of a piston head.
FIG. 7 is a sectional view showing an assembly structure of a piston head according to a first modification.
FIG. 8 is a cross-sectional view showing an assembly structure of a piston head according to a second modification.
FIG. 9 is a sectional view showing an assembly structure of a piston head according to a third modification.
FIG. 10 is a sectional view showing an assembly structure of a piston head according to a fourth modification.
FIG. 11 is a front view showing an appearance of a diaphragm member according to a fifth modified example.
FIG. 12 is a half cross-sectional view showing a conventional syringe.
[Explanation of symbols]
11 Piston member 13 Cylinder member 14 Hole 20, 50, 60, 70, 80, 90 Piston head 21, 51, 63 Base member 22, 52, 64, 71, 100 Diaphragm member 23, 54, 81, 91 Seal member 25 , 26, 58, 59, 61, 62 Conical surface 101 Notch

Claims (7)

シリンジのシリンダ部材にスライド自在に挿入されるピストン部材の先端に位置するピストンヘッドにおいて、
硬質なベース部材と、柔軟なシール部材と、前記ベース部材より柔軟で前記シール部材より硬質なダイヤフラム部材と、を有しており、
前記シール部材が前記ダイヤフラム部材の外周面上でシリンダ部材に密着し、
前記ベース部材と前記シール部材との間に位置している前記ダイヤフラム部材が後方に押圧されると外周方向に拡開するピストンヘッドであって、
前記ピストン部材の先端に位置して前面の少なくとも外側に前方に集束する円錐面が形成されているベース部材と、
このベース部材より柔軟で前記円錐面に当接する円錐面が後面の少なくとも外側に形成されている前記ダイヤフラム部材と、
このダイヤフラム部材より柔軟で少なくとも前記ダイヤフラム部材の外周面上に位置して前記シリンダ部材に密着する前記シール部材と、
を有しているピストンヘッド。 In the piston head located at the tip of the piston member slidably inserted into the cylinder member of the syringe,
A hard base member, a flexible seal member, and a diaphragm member that is more flexible than the base member and harder than the seal member;
The seal member is in close contact with the cylinder member on the outer peripheral surface of the diaphragm member;
A piston head that expands in an outer circumferential direction when the diaphragm member positioned between the base member and the seal member is pressed backward;
A base member formed at a tip of the piston member and formed with a conical surface that converges forward at least outside the front surface;
The diaphragm member having a conical surface which is softer than the base member and abutted against the conical surface is formed at least outside the rear surface;
The seal member which is more flexible than the diaphragm member and is located on the outer peripheral surface of the diaphragm member and is in close contact with the cylinder member;
Have Rupee piston head has a. シリンジのシリンダ部材にスライド自在に挿入されるピストン部材の先端に位置するピストンヘッドにおいて、
硬質なベース部材と、柔軟なシール部材と、前記ベース部材より柔軟で前記シール部材より硬質なダイヤフラム部材と、を有しており、
前記シール部材が前記ダイヤフラム部材の外周面上でシリンダ部材に密着し、
前記ベース部材と前記シール部材との間に位置している前記ダイヤフラム部材が後方に押圧されると外周方向に拡開するピストンヘッドであって、
前記ピストン部材の先端に位置するベース部材と、
このベース部材より柔軟で前面の少なくとも外側に後方に集束する円錐面が形成されている前記ダイヤフラム部材と、
このダイヤフラム部材より硬質で前記円錐面に当接する円錐面が後面の少なくとも外側に形成されているプッシャ部材と、
前記ダイヤフラム部材より柔軟で少なくとも前記ダイヤフラム部材の外周面上に位置して前記シリンダ部材に密着する前記シール部材と、
を有しているピストンヘッド。 In the piston head located at the tip of the piston member slidably inserted into the cylinder member of the syringe,
A hard base member, a flexible seal member, and a diaphragm member that is more flexible than the base member and harder than the seal member;
The seal member is in close contact with the cylinder member on the outer peripheral surface of the diaphragm member;
A piston head that expands in an outer circumferential direction when the diaphragm member positioned between the base member and the seal member is pressed backward;
A base member located at the tip of the piston member;
The diaphragm member formed with a conical surface that is more flexible than the base member and converges rearward at least outside the front surface;
A pusher member which is harder than the diaphragm member and has a conical surface which is in contact with the conical surface formed on at least the outer side of the rear surface;
The seal member that is more flexible than the diaphragm member and is located on the outer peripheral surface of the diaphragm member and is in close contact with the cylinder member;
Have Rupee piston head has a. シリンジのシリンダ部材にスライド自在に挿入されるピストン部材の先端に位置するピストンヘッドにおいて、
硬質なベース部材と、柔軟なシール部材と、前記ベース部材より柔軟で前記シール部材より硬質なダイヤフラム部材と、を有しており、
前記シール部材が前記ダイヤフラム部材の外周面上でシリンダ部材に密着し、
前記ベース部材と前記シール部材との間に位置している前記ダイヤフラム部材が後方に押圧されると外周方向に拡開するピストンヘッドであって、
前記ピストン部材の先端に位置して前面の少なくとも外側に前方に集束する円錐面が形成されているベース部材と、
このベース部材より柔軟で前記円錐面に当接する円錐面が後面の少なくとも外側に形成されているとともに前面の少なくとも外側に後方に集束する円錐面が形成されている前記ダイヤフラム部材と、
このダイヤフラム部材より硬質で前記ダイヤフラム部材の前面の前記円錐面に当接する円錐面が後面の少なくとも外側に形成されているプッシャ部材と、
前記ダイヤフラム部材より柔軟で少なくとも前記ダイヤフラム部材の外周面上に位置して前記シリンダ部材に密着する前記シール部材と、
を有しているピストンヘッド。 In the piston head located at the tip of the piston member slidably inserted into the cylinder member of the syringe,
A hard base member, a flexible seal member, and a diaphragm member that is more flexible than the base member and harder than the seal member;
The seal member is in close contact with the cylinder member on the outer peripheral surface of the diaphragm member;
A piston head that expands in an outer circumferential direction when the diaphragm member positioned between the base member and the seal member is pressed backward;
A base member formed at a tip of the piston member and formed with a conical surface that converges forward at least outside the front surface;
The diaphragm member is formed with a conical surface that is softer than the base member and abuts against the conical surface at least outside the rear surface, and a conical surface that converges rearward at least outside the front surface; and
A pusher member which is harder than the diaphragm member and has a conical surface which is in contact with the conical surface of the front surface of the diaphragm member formed at least outside the rear surface;
The seal member that is more flexible than the diaphragm member and is located on the outer peripheral surface of the diaphragm member and is in close contact with the cylinder member;
Have Rupee piston head has a. 前記プッシャ部材と前記シール部材とが一体に形成されている請求項２または３に記載のピストンヘッド。The piston head according to claim 2 or 3, wherein the pusher member and the seal member are integrally formed. 前記ダイヤフラム部材に、複数の切り欠きが放射方向に形成されている請求項１ないし４の何れか一項に記載のピストンヘッド。The piston head according to any one of claims 1 to 4, wherein a plurality of notches are formed in the diaphragm member in a radial direction. 薬液が充填されるシリンダ部材と、このシリンダ部材にスライド自在に挿入されるピストン部材と、このピストン部材の先端に位置して前記シリンダ部材に密着するピストンヘッドと、を有しているシリンジであって、
請求項１ないし５の何れか一項に記載のピストンヘッドを有しているシリンジ。A syringe having a cylinder member filled with a chemical solution, a piston member slidably inserted into the cylinder member, and a piston head positioned at the tip of the piston member and in close contact with the cylinder member. And
A syringe having the piston head according to any one of claims 1 to 5 . 前記ベース部材と前記ピストン部材とが一体に形成されている請求項６に記載のシリンジ。The syringe according to claim 6, wherein the base member and the piston member are integrally formed.
JP2002040066A 2002-02-18 2002-02-18 Piston head and syringe Expired - Fee Related JP3623942B2 (en)

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JP2009534072A (en) * 2006-04-19 2009-09-24 ノボ・ノルデイスク・エー／エス Fluid injection system, method for assembling the system, and drug container used in the system

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JP2010246842A (en) * 2009-04-20 2010-11-04 Usui Seisakusho:Kk Syringe
DK2962770T3 (en) 2009-07-24 2017-07-03 Bayer Healthcare Llc MEDICAL MULTI-FLUID INJECTION SYSTEM
US9593370B2 (en) 2010-10-01 2017-03-14 Oxford Nanopore Technologies Ltd. Biochemical analysis apparatus and rotary valve
GB2492955A (en) 2011-07-13 2013-01-23 Oxford Nanopore Tech Ltd One way valve
CN103946544B (en) 2011-09-15 2017-06-06 牛津纳米孔技术有限公司 Pump
GB2494683A (en) * 2011-09-15 2013-03-20 Oxford Nanopore Tech Ltd A piston seal for a syringe or syringe pump
US9827377B2 (en) 2013-03-08 2017-11-28 Nipro Corporation Syringe and syringe gasket

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