JP2018102631A - Injection tool for endoscope - Google Patents
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本発明は、体腔内に挿入され、体腔内の粘膜下層などに液体を注入するための内視鏡用注射具に関する。 The present invention relates to an endoscope injection tool that is inserted into a body cavity and injects a liquid into a submucosal layer or the like in the body cavity.
一般に食道、胃、大腸等の粘膜を切除する内視鏡的粘膜切除術（ＥＭＲ）及び内視鏡的粘膜下層剥離術（ＥＳＤ）を行う際には、粘膜下層に内視鏡用注射具を用いて生理食塩水や薬液等（以下、単に液体とも言う）を注入して粘膜下層を浮かせた状態とし、高周波メスや高周波スネアなどにより切除する。
上記内視鏡用注射具は、内視鏡のチャネルに挿通されて、内視鏡のチャネルの先端から突出した状態で、患部に対して先端の針を穿刺して液体を注入するものであり、先端に針体が設けられた内チューブとその内チューブを挿通自在にする外チューブとを有し、操作部により内チューブを外チューブに対し進退操作して、針体を外チューブから突没させるとともに、操作部に装着する注射筒から内チューブ及び針体を介して液体を患部に注入する。
In general, when performing endoscopic mucosal resection (EMR) and endoscopic submucosal dissection (ESD) to remove mucous membranes such as the esophagus, stomach, large intestine, etc. Inject physiological saline or chemicals (hereinafter also simply referred to as “liquid”) to float the submucosa, and excise it with a high-frequency knife or high-frequency snare.
The endoscope injection tool is inserted into a channel of an endoscope and injects a liquid by puncturing an affected part with a needle at the tip while protruding from the tip of the channel of the endoscope. An inner tube with a needle body at the tip and an outer tube that allows the inner tube to be inserted, and the inner tube is moved forward and backward with the operation unit, and the needle body protrudes and retracts from the outer tube. At the same time, liquid is injected into the affected area through the inner tube and the needle body from the syringe barrel attached to the operation section.
このような内視鏡用注射具に用いられる針体は、穿刺による傷を小さくするために、例えば外径０．６５ｍｍ以下のものが好ましいのに対し、内チューブの内径は、注入時の抵抗を少なくするために例えば０．８ｍｍ以上とすることが好ましいが、針体の外径に内チューブの内径を合わせると内チューブが細くなり、内管チューブの内径に針体を合わせると針体が太くなってしまう。このような課題を解決するものとして、例えば下記特許文献１に記載のような、針体の外周と内チューブ内周とのクリアランス（隙間）を接着剤などの部材で埋めることにより、細い針体を用いつつ内チューブの内径を大きくとることのできる内視鏡用注射具が提案されている。 The needle used for such an endoscope injection tool preferably has, for example, an outer diameter of 0.65 mm or less in order to reduce damage caused by puncture, whereas the inner diameter of the inner tube is a resistance at the time of injection. For example, when the inner diameter of the inner tube is adjusted to the outer diameter of the needle body, the inner tube becomes thinner, and when the needle body is adjusted to the inner diameter of the inner tube tube, the needle body becomes smaller. It gets thick. As a solution to such a problem, for example, as described in Patent Document 1 below, a thin needle body is formed by filling a clearance (gap) between the outer periphery of the needle body and the inner periphery of the inner tube with a member such as an adhesive. An endoscope injection tool that can increase the inner diameter of the inner tube while using the above has been proposed.
しかしながら、特許文献１に記載された内視鏡用注射具は、上述のように内チューブの内径を大きくとることができるが、内管チューブの径が大きくなると、内チューブの外径と外チューブの内径とのクリアランス（間隙）が狭くなる。
通常、患者の体内に挿入される内視鏡は、体腔内の形状に合わせて湾曲するため、内視鏡用注射具も湾曲し、このように内視鏡用注射具が湾曲した状態では、内チューブおよび外チューブ同士が接触する。内チューブと外チューブとの接触は、内チューブの外径と外チューブの内径とのクリアランスが狭いほど強くなるため、針体の突没の際に、摩擦抵抗が大きくなり、針体を操作しづらいと共に突没操作に時間がかかるという課題がある。
However, although the endoscope injection tool described in Patent Document 1 can increase the inner diameter of the inner tube as described above, the outer diameter of the inner tube and the outer tube increase as the diameter of the inner tube increases. Clearance (gap) with the inner diameter of the tube becomes narrow.
Normally, an endoscope inserted into a patient's body bends according to the shape in the body cavity, so the endoscope injection tool also bends, and in such a state where the endoscope injection tool is curved, The inner tube and the outer tube contact each other. The smaller the clearance between the inner tube outer diameter and the outer tube inner diameter, the stronger the contact between the inner tube and outer tube. There is a problem that it takes time for the sunk operation along with being difficult.
このような課題に鑑みて、本発明は、内視鏡が湾曲した状態でもスムーズに針体の突没操作が可能な内視鏡用注射具を提供することを目的とする。 In view of such a problem, an object of the present invention is to provide an endoscope injection tool capable of smoothly projecting and retracting a needle body even when the endoscope is curved.
前記目的を達成するために本発明は、液体を流入させるための中空長尺状の内チューブと、内チューブの先端に設けられた中空の針体と、前記内チューブが長手方向に進退自在に挿通可能な中空長尺状の外チューブと、前記内チューブと前記外チューブの基端側に取り付けられ、前記外チューブに対して前記内チューブを進退操作するための操作部を備える内視鏡用注射具において、前記内チューブの外周または前記外チューブの内周に、対向面と接触したときの接触面積を減らすための接触面積低減手段を備えることを特徴とする。 In order to achieve the above object, the present invention provides a hollow long inner tube for allowing a liquid to flow in, a hollow needle body provided at the tip of the inner tube, and the inner tube can be moved forward and backward in the longitudinal direction. A hollow long outer tube that can be inserted, and an endoscope that is attached to a proximal end side of the inner tube and the outer tube, and includes an operation unit for moving the inner tube forward and backward with respect to the outer tube. In the injection device, a contact area reducing means for reducing a contact area when contacting the opposing surface is provided on the outer periphery of the inner tube or the inner periphery of the outer tube.
また、前記接触面積低減手段は、長手方向の略全長に亘って断面半円状となる凸部であってもよく、前記内チューブと前記針体とを接続する中空の接続部材を設け、該接続部材の外周に前記外チューブと接触したときの接触面積を減らすための第二の接触面積低減手段を備えてもよい。 Further, the contact area reducing means may be a convex part having a semicircular cross section over substantially the entire length in the longitudinal direction, provided with a hollow connecting member for connecting the inner tube and the needle body, You may provide the 2nd contact area reduction means for reducing the contact area when contacting the said outer tube on the outer periphery of a connection member.
さらに、前記内チューブの内周に、内チューブを補強するための補強手段を設けてもよく、前記補強手段は、長手方向略全長に亘って断面半円状となる凸部であってもよい。 Furthermore, a reinforcing means for reinforcing the inner tube may be provided on the inner periphery of the inner tube, and the reinforcing means may be a convex part having a semicircular cross section over the substantially entire length in the longitudinal direction. .
また、前記内チューブ及び外チューブは、透過性を有するポリエーテルエーテルケトンにより構成されていてもよい。 The inner tube and the outer tube may be made of a permeable polyether ether ketone.
本発明による内視鏡用注射具は、液体を流入させるための中空長尺状の内チューブと、内チューブの先端に設けられた中空の針体と、前記内チューブが長手方向に進退自在に挿通可能な中空長尺状の外チューブと、前記内チューブと前記外チューブの基端側に取り付けられ、前記外チューブに対して前記内チューブを進退操作するための操作部を備える内視鏡用注射具において、前記内チューブの外周または前記外チューブの内周に、対向面と接触したときの接触面積を減らすための接触面積低減手段を備えることにより、外チューブと接するため内チューブとの間の摩擦が低減されて摺動がなめらかになり、内視鏡が湾曲した状態でもスムーズな針体の突没操作が可能となる。 An endoscope injection tool according to the present invention includes a hollow long inner tube for allowing a liquid to flow in, a hollow needle body provided at the tip of the inner tube, and the inner tube being movable in the longitudinal direction. A hollow long outer tube that can be inserted, and an endoscope that is attached to a proximal end side of the inner tube and the outer tube, and includes an operation unit for moving the inner tube forward and backward with respect to the outer tube. In the injection tool, by providing a contact area reducing means for reducing a contact area when contacting the opposite surface on the outer periphery of the inner tube or the outer periphery of the outer tube, the inner tube is in contact with the outer tube. Thus, the sliding of the needle body is smoothed and the needle body can be smoothly pushed and retracted even when the endoscope is curved.
以下、本発明による内視鏡用処置具の実施形態を図面を参照して詳細に説明する。
［第１実施例］
本発明の第１実施形態による内視鏡用注射具１００は、図示しない内視鏡のチャネル内に挿入され、体腔内の粘膜下層などに薬液を注入するためのものであって、図１に示すように、中空長尺状の外チューブ１と、外チューブ１の内部に配置される中空長尺状の内チューブ２と、内チューブ２の先端に取り付けられた中空の針体３と、外チューブ１および内チューブ２の基端側に取り付けられる操作部４とを備える。
Hereinafter, embodiments of an endoscope treatment tool according to the present invention will be described in detail with reference to the drawings.
[First embodiment]
An endoscope injection tool 100 according to a first embodiment of the present invention is inserted into a channel of an endoscope (not shown), and injects a drug solution into a submucosal layer or the like in a body cavity. As shown, a hollow elongate outer tube 1, a hollow elongate inner tube 2 disposed inside the outer tube 1, a hollow needle body 3 attached to the tip of the inner tube 2, an outer And an operating portion 4 attached to the proximal end side of the tube 1 and the inner tube 2.
外チューブ１は、例えばＰＥＥＫ（ポリエーテルエーテルケトン）樹脂やＰＴＦＥ（ポリテトラフルオロエチレン）等からなり、内部に内チューブ２を挿通するために可撓性のある中空の長尺状に形成され、基端には後述する操作部本体４ａが連結される。また、外チューブ１の先端は内側に折り曲げ形成されており、後述する内チューブ２が先端から突出しないようになっている。 The outer tube 1 is made of, for example, PEEK (polyetheretherketone) resin, PTFE (polytetrafluoroethylene), etc., and is formed into a flexible hollow long shape for inserting the inner tube 2 into the inside. An operation unit body 4a, which will be described later, is connected to the base end. Moreover, the front-end | tip of the outer tube 1 is bend | folded and formed inside, and the inner tube 2 mentioned later does not protrude from a front-end | tip.
内チューブ２は、例えばＰＥＥＫ（ポリエーテルエーテルケトン）樹脂やＰＴＦＥ（ポリテトラフルオロエチレン）等からなり、薬液等を送液するために可撓性のある中空の長尺状に形成され、先端には後述する針体３が連結され、基端には後述するスライダ４ｂが連結される。
内チューブ２の外周には、図２（ａ）のＡ−Ａ断面を示す図２（ｂ）に示すように、対向面である外チューブ１の内周面との接触時の接触面積を減らして摩擦を低減するための接触面積低減手段である断面略半円の複数の凸部２ａが長手方向の全長に亘り形成されている。
The inner tube 2 is made of, for example, PEEK (polyetheretherketone) resin, PTFE (polytetrafluoroethylene), etc., and is formed into a flexible hollow long shape for feeding a chemical solution or the like. Is connected to a needle body 3 described later, and a slider 4b described later is connected to the base end.
On the outer periphery of the inner tube 2, as shown in FIG. 2 (b) showing the AA cross section of FIG. 2 (a), the contact area at the time of contact with the inner peripheral surface of the outer tube 1 which is the opposite surface is reduced. A plurality of convex portions 2a having a substantially semicircular cross section, which is a contact area reducing means for reducing friction, are formed over the entire length in the longitudinal direction.
なお、本実施例においては、凸部２ａを４箇所としたが、これに限られず、少なくとも２箇所以上あればよい。
また、凸部２ａの形状は、外チューブ１との接触面積を減少させる形状であればよいため、上記のよう断面略半円の凸部を長手方向全長に亘り形成するものに限られず、例えば断面略半円の凸部を断続的に設けるようにしてもよく、半球状の凸部を複数設けるようにしてもよく、凸部の断面は三角形や台形などにしてもよい。
さらに、凸部等の接触面積低減手段の形成方法は、押し出し成型などにより内チューブに凸部を一体的に形成してもよく、また内チューブの外周に凸部を後から取り付けるようにしてもよく、内チューブの外周に長手方向の溝を複数形成することにより結果的に凸部となるようにしてもよい。
In the present embodiment, the number of the convex portions 2a is four. However, the present invention is not limited to this, and there may be at least two or more.
Moreover, since the shape of the convex part 2a should just be a shape which reduces the contact area with the outer tube 1, it is not restricted to what forms the convex part of a cross-sectional substantially semicircle over the full length direction as mentioned above, for example, A convex portion having a substantially semicircular cross section may be provided intermittently, or a plurality of hemispherical convex portions may be provided. The cross section of the convex portion may be a triangle or a trapezoid.
Further, the method for forming the contact area reducing means such as the convex portion may be formed by integrally forming the convex portion on the inner tube by extrusion molding or by attaching the convex portion to the outer periphery of the inner tube later. Alternatively, a plurality of longitudinal grooves may be formed on the outer periphery of the inner tube, resulting in a convex portion.
なお、外チューブ１及び内チューブ２は、非結晶化により透過性を有するように製造されたＰＥＥＫ（ベンゼン環がエーテル結合とケトン結合によってつながるポリマーであるポリエーテルエーテルケトン）により構成すると好ましく、この場合には、透過性を有するため、内チューブ２の内部の液体が見やすく、また例えばＰＴＦＥ（ポリテトラフルオロエチレン）に比べて強度があるため薄く形成でき、内径を広くとることができる。 The outer tube 1 and the inner tube 2 are preferably composed of PEEK (polyether ether ketone, which is a polymer in which a benzene ring is connected by an ether bond and a ketone bond) manufactured so as to have permeability by non-crystallization. In some cases, since it has permeability, it is easy to see the liquid inside the inner tube 2, and it can be formed thinner because it is stronger than, for example, PTFE (polytetrafluoroethylene), and the inner diameter can be increased.
針体３は、ステンレス等のような硬質の金属材または硬質のプラスチック材等により形成されており、図２に示すように、先端部分が斜めにカットされた針状に形成されている。
針体３の外周は、円筒状の接続部材５を介して内チューブ２の先端側内周に取り付けられており、針体３の外径よりも内チューブ２の内径を大きくとれるようにしている。なお、接続部材５は接着剤その他で取り付けられている。
The needle body 3 is formed of a hard metal material such as stainless steel or a hard plastic material, and as shown in FIG. 2, the needle body 3 is formed in a needle shape with its tip portion cut obliquely.
The outer circumference of the needle body 3 is attached to the inner circumference on the distal end side of the inner tube 2 via a cylindrical connecting member 5 so that the inner diameter of the inner tube 2 can be made larger than the outer diameter of the needle body 3. . The connecting member 5 is attached with an adhesive or the like.
操作部４は、図１に示すように、外チューブ１の基端に連通して接続される中空の操作部本体４ａと、外チューブ１および操作部本体４ａの内部に挿通される内チューブ２の基端側に接続され、内チューブ２と連通して接続される筒状のスライダ４ｂを備え、操作部本体４ａに対してスライダ４ｂを進退操作することにより、内チューブ２の先端に取り付けられた針体３を外チューブ１の先端から突没させることができる。
また、スライダ４ｂの基端側にはコネクターが配置されており、コネクター４ｃに注射筒（図示せず）を接続して、生理食塩水や薬液等の液体を注入することができる。
As shown in FIG. 1, the operation unit 4 includes a hollow operation unit main body 4a that is connected to and connected to the proximal end of the outer tube 1, and an inner tube 2 that is inserted into the outer tube 1 and the operation unit main body 4a. A cylindrical slider 4b connected to the inner tube 2 and connected to the inner tube 2, and is attached to the distal end of the inner tube 2 by moving the slider 4b forward and backward with respect to the operation portion main body 4a. The needle body 3 can be protruded from the tip of the outer tube 1.
Further, a connector is disposed on the base end side of the slider 4b, and a syringe or the like (not shown) can be connected to the connector 4c to inject a liquid such as physiological saline or a chemical solution.
上記構成の内視鏡用注射具１００を使用するときには、予め患者の体腔内に挿入された内視鏡（図示せず）のチャネル内に、外チューブ１の内部に針体３を収納した状態で挿通され、患部付近において、先端側を内視鏡の先端から突出させる。そして、操作部本体４ａに対してスライダ４ｂを進退操作することにより、内チューブ２の先端に取り付けられた針体３を外チューブ１の先端から突出させて、患部に針体３を穿刺する。この状態で、コネクター４ｃに接続された注射筒等から送られた生理食塩水や薬液等の液体を内チューブ２及び針体３を介して患部の粘膜下層に注入して、粘膜下層を浮かせた状態とし、高周波メスや高周波スネアなどにより切除する。 When using the endoscope injection tool 100 having the above-described configuration, the needle body 3 is housed inside the outer tube 1 in the channel of an endoscope (not shown) previously inserted into the body cavity of the patient. In the vicinity of the affected area, the distal end is projected from the distal end of the endoscope. Then, by moving the slider 4b forward and backward with respect to the operation portion main body 4a, the needle body 3 attached to the distal end of the inner tube 2 is projected from the distal end of the outer tube 1, and the needle body 3 is punctured into the affected area. In this state, a liquid such as a physiological saline solution or a chemical solution sent from an injection cylinder connected to the connector 4c was injected into the submucosal layer of the affected area through the inner tube 2 and the needle body 3 to float the submucosal layer. The condition is removed and resected with a high-frequency knife or high-frequency snare.
本実施例の内視鏡用注射具１００は、内チューブ２の外周に、外チューブ１の内周面との接触時の接触面積を減らして摩擦抵抗を低減するための接触面積低減手段である断面略半円の複数の凸部２ａが長手方向の全長に亘り形成されていることにより、凸部２ａの頂点のみが外チューブ１の内壁と接するため内チューブ２と外チューブ１との間の摩擦が低減されて摺動がなめらかになり、内視鏡が湾曲した状態でもスムーズな針体の突没操作が可能となる。 The endoscope injection tool 100 of this embodiment is a contact area reducing means for reducing the frictional resistance by reducing the contact area at the time of contact with the inner peripheral surface of the outer tube 1 on the outer periphery of the inner tube 2. Since the plurality of convex portions 2 a having a substantially semicircular cross section are formed over the entire length in the longitudinal direction, only the apex of the convex portion 2 a is in contact with the inner wall of the outer tube 1, so that there is a gap between the inner tube 2 and the outer tube 1. The friction is reduced and the sliding is smooth, and the needle can be smoothly projected and retracted even when the endoscope is curved.
［第２実施例］
前述の第１実施例においては、内チューブの外周に、外チューブの内周面との接触時の接触面積を減らして摩擦を低減するための接触面積低減手段である断面略半円の複数の凸部を長手方向全長に亘り形成する例を説明したが、これに限られず、例えば図３（ａ）のＢ−Ｂ断面を示す図３（ｂ）に示すように、外チューブ６の内周に、内チューブ７の外周面との摩擦を低減するための接触面積低減手段である断面略半円の複数の凸部６ａを長手方向全長に亘り形成してもよい。
なお、上記の構成以外の構成については、第１実施例と同様であるため省略する。
[Second Embodiment]
In the first embodiment described above, a plurality of substantially semicircular cross-sections that are contact area reducing means for reducing friction by reducing the contact area at the time of contact with the inner peripheral surface of the outer tube on the outer periphery of the inner tube. Although the example which forms a convex part over a longitudinal direction full length was demonstrated, it is not restricted to this, For example, as shown in FIG.3 (b) which shows the BB cross section of Fig.3 (a), the inner periphery of the outer tube 6 is shown. Moreover, you may form several convex part 6a of a cross-sectional substantially semicircle which is a contact area reduction means for reducing the friction with the outer peripheral surface of the inner tube 7 over a longitudinal direction full length.
Since the configuration other than the above configuration is the same as that of the first embodiment, a description thereof will be omitted.
なお、第１実施例と同様に、凸部６ａは少なくとも２箇所以上あればよい。凸部６ａの形状は、内チューブ７との接触時の接触面積を減少させる形状であればよいため、断面略半円の凸部を全長ではなく断続的に設けることや、半球状の凸部を複数設けるようにしてもよい。また、凸部の断面は頂点部分のみが内チューブ外周面と接する三角形や台形などの形状でもよい。
また、第１実施例と同様に接触面積低減手段の形成方法は、押し出し成型などにより外チューブに凸部を一体的に形成してもよく、また外チューブの内周に凸部を後から取り付けるようにしてもよく、外チューブの内周に長手方向の溝を複数形成することにより結果的に凸部となるようにしてもよい。
Note that, as in the first embodiment, there may be at least two convex portions 6a. The shape of the convex portion 6a may be any shape that reduces the contact area at the time of contact with the inner tube 7, so that the convex portion having a substantially semicircular cross section may be provided intermittently instead of the full length, A plurality of may be provided. Further, the cross section of the convex portion may have a shape such as a triangle or a trapezoid in which only the apex portion contacts the outer peripheral surface of the inner tube.
Further, as in the first embodiment, the method for forming the contact area reducing means may form the protrusions integrally on the outer tube by extrusion molding or the like, and attach the protrusions to the inner periphery of the outer tube later. Alternatively, a plurality of longitudinal grooves may be formed on the inner periphery of the outer tube, resulting in a convex portion.
本実施例によると、外チューブ６の内周に、内チューブ７の外周面との摩擦抵抗を低減するための接触面積低減手段である断面略半円の複数の凸部６ａが長手方向全長に亘り形成されていることにより、凸部６ａの頂点のみが内チューブ７の外周面と接するため、内チューブ７と外チューブ６との間の摩擦が低減されて摺動がなめらかになり、内視鏡が湾曲した状態でもスムーズに針体の突没操作が可能となる。 According to the present embodiment, a plurality of convex portions 6 a having a substantially semicircular cross section, which is a contact area reducing means for reducing frictional resistance with the outer peripheral surface of the inner tube 7, are formed in the entire length in the longitudinal direction. By being formed over, only the apex of the convex portion 6a is in contact with the outer peripheral surface of the inner tube 7, so that the friction between the inner tube 7 and the outer tube 6 is reduced, and the sliding becomes smoother. Even when the mirror is curved, the needle body can be smoothly projected and retracted.
［第３実施例］
前述の実施例においては、内チューブの外周または外チューブの内周に凸部を設ける例を説明したが、これに限られず、例えば図４（ａ）に示すような、接続部材１０が、外径が内チューブ９と略同径の太径部と内チューブ９の内径と略同径の細径部とを有して、内チューブ９により細径部を覆うように取り付けるものである場合など、湾曲時に接続部材１０が外チューブ８に接触するような形状の場合は、図４（ｂ）に示すように、接続部材１０の外周にも凸部１０ａを形成してもよい。
なお、上記の構成以外の構成については、上述の実施例と同様であるため省略する。
[Third embodiment]
In the above-described embodiment, the example in which the convex portion is provided on the outer periphery of the inner tube or the inner periphery of the outer tube has been described. However, the present invention is not limited to this. For example, the connecting member 10 as illustrated in FIG. In the case where the inner tube 9 has a large diameter portion that is substantially the same diameter as the inner tube 9 and a small diameter portion that is substantially the same diameter as the inner tube 9, and the inner tube 9 is attached so as to cover the small diameter portion. In the case where the connecting member 10 is in contact with the outer tube 8 at the time of bending, a convex portion 10a may be formed on the outer periphery of the connecting member 10 as shown in FIG.
In addition, since it is the same as that of the above-mentioned Example about the structure other than said structure, it abbreviate | omits.
本実施例によると、前述の実施例の効果に加え、接続部材の凸部１０ａのみが外チューブ８の内壁と接するため、接続部材と外チューブとの摩擦抵抗も低減することができ、針体の突没操作がスムーズになる効果も奏する。 According to the present embodiment, in addition to the effects of the above-described embodiments, only the convex portion 10a of the connecting member is in contact with the inner wall of the outer tube 8, so that the frictional resistance between the connecting member and the outer tube can be reduced. There is also an effect of smoothing the sunk operation.
［第４実施例］
前述の実施例においては、針体と内チューブとの間に接続部材を設ける例を説明したが、これに限られず、図５に示すように、接続部材を設けずに、内チューブ１２に針体３を直接取り付け、内チューブ１２の収縮力により針体３を締め付けて固定するようにしてもよい。
内チューブ１２の外周には、図５（ｂ）及び（ｃ）に示すように、外チューブ１１の内周面との接触時の接触面積を減らして摩擦を低減するための接触面積低減手段である断面略半円の複数の凸部１２ａが長手方向全長に亘り形成されている。
また、図５（ｃ）に示すように、内チューブ１２の内周は、内部に注入される液体がスムーズに流動するよう内径を広く形成してあり、内チューブ１２の強度を保つための補強手段である凸部１２ｂが、針体３の後端近傍から長手方向全長に亘り形成されている。
なお、上記の構成以外の構成については、上述の実施例と同様であるため省略する。
[Fourth embodiment]
In the above-described embodiment, the example in which the connecting member is provided between the needle body and the inner tube has been described. However, the present invention is not limited to this, and as shown in FIG. The body 3 may be directly attached, and the needle body 3 may be fastened and fixed by the contraction force of the inner tube 12.
As shown in FIGS. 5B and 5C, the outer periphery of the inner tube 12 is contact area reducing means for reducing friction by reducing the contact area when contacting the inner peripheral surface of the outer tube 11. A plurality of convex portions 12a having a substantially semicircular cross section are formed over the entire length in the longitudinal direction.
Further, as shown in FIG. 5C, the inner circumference of the inner tube 12 is formed with a wide inner diameter so that the liquid injected into it flows smoothly, and the reinforcement for maintaining the strength of the inner tube 12 The convex part 12b which is a means is formed from the vicinity of the rear end of the needle body 3 over the entire length in the longitudinal direction.
In addition, since it is the same as that of the above-mentioned Example about the structure other than said structure, it abbreviate | omits.
本実施例によると、内チューブ１２の外周に、外チューブ１１の内周面との接触時の接触面積を減らして摩擦抵抗を低減するため接触面積低減手段である断面略半円の複数の凸部１２ａが長手方向の全長に亘り形成されていることにより、凸部１２ａの頂点のみが外チューブ１１の内壁と接するため内チューブ１２と外チューブ１１との間の摩擦が低減されて摺動がなめらかになり、内視鏡が湾曲した状態でも針体の突没操作がスムーズになる効果を奏する。
また、接続部材を設けずに直接針体に内チューブ１２を取り付けたことにより、少ない部品で内視鏡注射具を製造することができる。
内チューブ１２の内周を薄く形成するとともに凸部１２ｂを長手方向に設けたことにより、液体が流動し易く、また強度を保ちつつ内径を広くとることができるため液体の流動がスムーズになる。
According to this embodiment, a plurality of protrusions having a substantially semicircular cross section as a contact area reducing means on the outer periphery of the inner tube 12 to reduce the frictional resistance by reducing the contact area when contacting the inner peripheral surface of the outer tube 11. Since the portion 12a is formed over the entire length in the longitudinal direction, only the apex of the convex portion 12a is in contact with the inner wall of the outer tube 11, so that the friction between the inner tube 12 and the outer tube 11 is reduced and sliding is possible. It is smooth and produces an effect of smoothing the protrusion / retraction operation of the needle even when the endoscope is curved.
Further, by attaching the inner tube 12 directly to the needle body without providing a connecting member, it is possible to manufacture an endoscope injection tool with a small number of parts.
By forming the inner circumference of the inner tube 12 thin and providing the convex portions 12b in the longitudinal direction, the liquid easily flows, and the inner diameter can be widened while maintaining the strength, so that the liquid flows smoothly.
１ 外チューブ
２ 内チューブ
２ａ 凸部
３ 針体
４ 操作部
１００ 内視鏡用注射具
DESCRIPTION OF SYMBOLS 1 Outer tube 2 Inner tube 2a Convex part 3 Needle body 4 Operation part 100 Injection tool for endoscopes
Claims (6)
該内チューブの先端に設けられた中空の針体と、
前記内チューブが長手方向に進退自在に挿通可能な中空長尺状の外チューブと、
前記内チューブと前記外チューブの基端側に取り付けられ、前記外チューブに対して前記内チューブを進退操作するための操作部を備える内視鏡用注射具において、
前記内チューブの外周または前記外チューブの内周に、対向面と接触したときの接触面積を減らすための接触面積低減手段を備えることを特徴とする内視鏡用注射具。 A hollow long inner tube for flowing liquid;
A hollow needle provided at the tip of the inner tube;
A hollow long outer tube through which the inner tube can be inserted and retracted in the longitudinal direction; and
In the endoscope injection tool, which is attached to the proximal end side of the inner tube and the outer tube and includes an operation unit for moving the inner tube forward and backward with respect to the outer tube.
An endoscope injection tool comprising a contact area reducing means for reducing a contact area when contacting an opposing surface on an outer circumference of the inner tube or an inner circumference of the outer tube.
前記接触面積低減手段は、長手方向の略全長に亘って断面半円状となる凸部であることを特徴とする内視鏡用注射具。 The endoscope injection tool according to claim 1,
The injection tool for an endoscope, wherein the contact area reducing means is a convex portion having a semicircular cross section over substantially the entire length in the longitudinal direction.
前記内チューブと前記針体とを接続する中空の接続部材を設け、
該接続部材の外周に前記外チューブと接触したときの接触面積を減らすための第二の接触面積低減手段を備えることを特徴とする内視鏡用注射具。 The endoscope injection tool according to claim 1 or 2,
A hollow connection member for connecting the inner tube and the needle body is provided,
An endoscope injection tool comprising second contact area reducing means for reducing a contact area when contacting the outer tube on an outer periphery of the connection member.
前記内チューブの内周に、内チューブを補強するための補強手段を設けることを特徴とする内視鏡用注射具。 The endoscope injection tool according to any one of claims 1 to 3,
An endoscope injection tool, wherein reinforcing means for reinforcing the inner tube is provided on the inner periphery of the inner tube.
前記補強手段は、長手方向略全長に亘って断面半円状となる凸部であることを特徴とする内視鏡用注射具。 The endoscope injection tool according to claim 4,
The endoscope injection tool according to claim 1, wherein the reinforcing means is a convex portion having a semicircular cross section over substantially the entire length in the longitudinal direction.
前記内チューブ及び外チューブは、透過性を有するポリエーテルエーテルケトンにより構成されることを特徴とする内視鏡用注射具。
The endoscope injection tool according to any one of claims 1 to 5,
An endoscope injection tool, wherein the inner tube and the outer tube are made of permeable polyether ether ketone.
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| JP2016252524A JP2018102631A (en) | 2016-12-27 | 2016-12-27 | Injection tool for endoscope |
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| JP2016252524A JP2018102631A (en) | 2016-12-27 | 2016-12-27 | Injection tool for endoscope |
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| CN113811340A (en) * | 2019-05-10 | 2021-12-17 | 株式会社Lake·E2 | Injection instrument for endoscope |
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