JP4407270B2 - Living body insertion catheter - Google Patents

Living body insertion catheter Download PDF

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JP4407270B2
JP4407270B2 JP2003421725A JP2003421725A JP4407270B2 JP 4407270 B2 JP4407270 B2 JP 4407270B2 JP 2003421725 A JP2003421725 A JP 2003421725A JP 2003421725 A JP2003421725 A JP 2003421725A JP 4407270 B2 JP4407270 B2 JP 4407270B2
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catheter
tip tube
extension
shaft
shaft portion
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JP2005177097A (en
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英雄 三舩
芳雄 幡野
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Asahi Intecc Co Ltd
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Description

本発明は、診断又は治療のため医療器具又は薬液等を患部又は治療部の目的部位に導入するため、患者の血管、管腔等に挿入される生体挿入用カテーテルの構成、構造に関するものである。  The present invention relates to the configuration and structure of a living body insertion catheter that is inserted into a blood vessel, a lumen, etc. of a patient in order to introduce a medical instrument or a drug solution to a target site of an affected area or a treatment section for diagnosis or treatment. .

〔発明の背景〕
生体挿入用カテーテルは診断又は治療目的のため生体の血管又は管腔に挿入される管状部材よりなる医療器具である(以下生体挿入用カテーテルを単にカテーテルと称する)。カテーテルは生体の血管、管腔等の脈管構造内に挿入され、診断、治療、薬剤投与、排液、潅注等の多岐に目的に利用される。カテーテルがこれ等の目的に利用される場合、カテーテルは患者の皮膚の切開部より血管内に挿入され、或いは消化管、リンパ管、気道、尿道等の管腔に挿入され、診断或いは治療ための目的部位にカテーテルの先端チューブ部を案内到達せしめる。
BACKGROUND OF THE INVENTION
A living body insertion catheter is a medical instrument composed of a tubular member inserted into a blood vessel or lumen of a living body for diagnostic or therapeutic purposes (hereinafter, the living body insertion catheter is simply referred to as a catheter). A catheter is inserted into a vascular structure such as a blood vessel and a lumen of a living body, and is used for various purposes such as diagnosis, treatment, drug administration, drainage, and irrigation. When a catheter is used for these purposes, the catheter is inserted into a blood vessel through an incision in the patient's skin, or inserted into a lumen such as the digestive tract, lymphatic tract, airway, urethra, etc. for diagnosis or treatment. Guide the distal tube portion of the catheter to the target site.

カテーテルのシャフト部には生体内挿入時に手元側となる端部にカテーテルハブが取付けられ、このカテーテルハブはカテーテルの生体内への挿入、生体内目的部位への案内に用いられるガイドワイヤー、その他の治療目的機具、薬剤注入管等のカテーテルへの挿入口となる。
またシャフト部の生体内への挿入先端側には先端チューブ部が、更にその先端にチップ部が接着されている。
A catheter hub is attached to the end of the catheter shaft on the proximal side when inserted into the living body. This catheter hub is a guide wire used for inserting the catheter into the living body and guiding it to the target site in the living body. It serves as an insertion port for catheters such as therapeutic purpose devices and drug injection tubes.
A tip tube portion is bonded to the distal end side of the shaft portion into the living body, and a tip portion is further bonded to the tip end thereof.

カテーテルのシャフト部はその構成の主体部となり、生体内への挿入にあたり、血管又は管腔の複雑な屈曲に対応する追従性(トラッカビリティ)が要求されると共に、カテーテルの体内への挿入時の押し込み易さ(プッシャビリティ)と、更に生体組織を傷つけない柔軟性と滑り性とが要求される。
先端チューブ部と、チップ部はカテーテルの先端部となり、患部、目的部位に的確に到達されるよう、シャフト部に較べ更に柔軟で可撓性が要求される。
The shaft portion of the catheter is the main part of the structure, and for insertion into the living body, followability (trackability) corresponding to complicated bending of blood vessels or lumens is required, and at the time of insertion of the catheter into the body Ease of pushing (pushability) and flexibility and slipperiness that do not damage living tissue are required.
The distal tube portion and the tip portion become the distal end portion of the catheter, and are required to be more flexible and flexible than the shaft portion so as to reach the affected area and the target site accurately.

従来より、これ等カテーテルは目的用途に合わせて、それぞれの要求特性に応じて各種のものが作製され、これに対応する構成、構造、使用される部材の選定、或いは性能向上のための検討が進められており、カテーテルに関しては多数の特許が開示されている(例えば特許文献1〜6参照)。  Conventionally, various types of these catheters have been prepared according to the required characteristics according to the intended use, and the corresponding configuration, structure, selection of members to be used, or studies for improving performance have been studied. A number of patents have been disclosed regarding catheters (see, for example, Patent Documents 1 to 6).

米国特許第4976690号公報U.S. Pat. No. 4,976,690 米国特許第4775371号公報U.S. Pat. No. 4,775,371 特許第3343266号公報Japanese Patent No. 3343266 特許第3115799号公報Japanese Patent No. 3115799 特開2003−019025号公報JP 2003-019025 A 特開2000−185103号公報JP 2000-185103 A

上記特許はカテーテルの生体内への挿入の際の性能向上を主要目的とした各種の改善に関するものである。
一方、カテーテルを利用しての治療施術において、施術後におけるカテーテルの体内よりの引抜き、抜去の際の操作性に対する配慮も重要事項である。
施術後に確実に生体内よりカテーテルが抜去可能なカテーテルの構成と構造に関する改善が要求されるところである。
The above patent relates to various improvements whose main purpose is to improve the performance of inserting a catheter into a living body.
On the other hand, in the treatment using a catheter, consideration for operability when the catheter is pulled out or removed from the body after the operation is also an important matter.
There is a need for improvements in the structure and structure of a catheter that can be reliably removed from the living body after treatment.

体内治療部位へカテーテルを挿入し施術の際、カテーテル先端の柔軟な先端チューブ部は複雑に屈曲した血管又は管腔等に挿入される。施術後にカテーテルをシャフト部を介して引張り、体外へ引き抜く抜去の際に、シャフト部よりの引張荷重が、先端チューブ部と、シャフト部と先端チューブ部との接着箇所に印加されることになる。  When performing a treatment by inserting a catheter into a treatment site in the body, the flexible distal tube portion at the distal end of the catheter is inserted into a complexly bent blood vessel or lumen. When the catheter is pulled through the shaft portion after the treatment and pulled out of the body, a tensile load from the shaft portion is applied to the tip tube portion and the bonding portion between the shaft portion and the tip tube portion.

シャフト部と先端チューブ部との接着箇所における接着引張強度は一般にシャフト部、先端チューブ部自体の引張強度より弱いため、カテーテル抜去のための引張荷重が直接接着箇所へ集中することのないような構造のカテーテルが望まれる。  The structure where the tensile load for removing the catheter does not concentrate directly on the bonded part because the tensile strength at the bonded part of the shaft part and the distal tube part is generally weaker than the tensile strength of the shaft part and the distal tube part itself. A catheter is desired.

施術者がカテーテルの体外への抜去の際、先端チューブ部が体内へ係留、係止を感知した場合、施術者はカテーテルを手元側へ一方向に無理に引張ることなく、シャフト部をカテーテルの挿入方向に押し戻し、次に手元側に引き戻す。これを繰り返すことにより、先端チューブ部の体内への係留を解除し、カテーテルを体外へ抜去することを実施している。本発明においては、カテーテルの体外への抜去の操作をより良好に実施出来るようにすることを目的とする。  When the practitioner pulls the catheter out of the body, if the tip tube section is anchored or detected in the body, the practitioner inserts the catheter into the shaft without forcibly pulling the catheter in one direction. Push back in the direction, then pull back to the hand side. By repeating this, the anchoring of the distal tube portion into the body is released, and the catheter is removed from the body. An object of the present invention is to make it possible to better perform the operation of removing the catheter from the body.

この目的を達成するために、本発明の請求項1に記載の生体挿入用カテーテルは、合成樹脂の管状部材により構成されたシャフト部及び先端チューブ部を備え、前記シャフト部に先端チューブ部を接着したものを対象として、特に、前記シャフト部と前記先端チューブ部との接着箇所に、前記シャフト部及び前記先端チューブ部よりも低い降伏点荷重値の材料によって形成された伸長部を備えたことを特徴とする。
また、請求項2に記載の生体挿入用カテーテルは、請求項1に記載の生体挿入用カテーテルにおいて、前記シャフト部及び前記先端チューブ部の少なくとも一方はX線視認用造影剤を混入した合成樹脂から構成され、前記伸張部は、前記X線視認用造影剤を混入しない合成樹脂又は前記X線視認用造影剤を混入した前記シャフト部もしくは前記先端チューブよりも前記X線視認用造影剤の混入量が少ない合成樹脂から構成されていることを特徴とする。
In order to achieve this object, a living body insertion catheter according to claim 1 of the present invention includes a shaft portion and a tip tube portion made of a synthetic resin tubular member, and the tip tube portion is bonded to the shaft portion. In particular, the bonded portion between the shaft portion and the tip tube portion is provided with an elongated portion formed of a material having a lower yield point load value than the shaft portion and the tip tube portion. Features.
The biological insertion catheter according to claim 2 is the biological insertion catheter according to claim 1, wherein at least one of the shaft portion and the distal tube portion is made of a synthetic resin mixed with a contrast medium for X-ray viewing. The extension portion is configured so that the X-ray visual contrast medium is mixed in more than the synthetic resin in which the X-ray visual contrast medium is not mixed or the shaft portion or the tip tube mixed with the X-ray visual contrast medium. It is characterized by being comprised from a synthetic resin with few.

本発明では、カテーテルにおいて、ャフト部と先端チューブ部間にシャフト部及び先端チューブ部よりも低い降伏点荷重値の材料によって形成された伸長部を介在、接着したカテーテルを作製した。
カテーテルに上記伸長部を設定することにより、シャフト部と先端チューブ部間に引張加重が印加された場合、この引張加重が伸長部の降伏点加重値以上に印加されると伸長部が伸長し、機械的強度の弱い接着箇所へ引張荷重が集中することなく緩和作用をもたせたものとすることが出来た。
本発明をカテーテルに適用することにより、カテーテルを用いて施術後の体外へのカテーテルの抜去における操作性を向上することが出来た。
In the present invention, the catheter, interposed extension portion formed by the material of the lower yield point load value than the shaft portion and the tip tube portion between sheet Yafuto and distal tube portion, to produce an adhesive catheters.
By setting the extension part on the catheter, when a tensile load is applied between the shaft part and the tip tube part, the extension part is extended when this tensile load is applied above the yield point weight value of the extension part, It was possible to provide a relaxing action without concentrating the tensile load on the bonded portion having weak mechanical strength.
By applying the present invention to a catheter, the operability in removing the catheter to the outside of the body after the treatment using the catheter could be improved.

カテーテルの一事例としての構成を図1に示す。1は手元側となり、ガイドワイヤー等の挿入口となるカテーテルハブ、これに連結されてシャフト部2、先端チューブ部4、最先端のチップ部6で構成される。シャフト部2及び先端チューブ部4はポリエチレン、ポリプロピレン、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリテトラフルオロエチレン、エチレン−テトラフルオロエチレン共重合体、ポリスチレン、ポリアミド、ポリウレタン、ポリイミド等の各種合成樹脂、或いはポリアミドエラストマー、ポリエステルエラストマー、ポリウレタンエラストマー、ポリスチレンエラストマー、弗素系エラストマー等の各種エラストマーを構成材料としている。A configuration as an example of a catheter is shown in FIG. Reference numeral 1 is a proximal side, and includes a catheter hub serving as an insertion port for a guide wire and the like, a shaft portion 2, a distal end tube portion 4, and a state-of-the-art tip portion 6 connected thereto. The shaft portion 2 and the tip tube portion 4 are polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, various synthetic resins such as polystyrene, polyamide, polyurethane, polyimide, or polyamide elastomer. Various elastomers such as polyester elastomers, polyurethane elastomers, polystyrene elastomers, and fluorine elastomers are used as constituent materials.

シャフト部2は上記各種合成樹脂材料を使用して管状に押出成形され、目的用途により屈曲性の他にプッシャビリティが要求されるため、その管壁層中にはステンレス鋼、Ni−Ti合金等の金属細線の編組が挿入されており、合成樹脂層も一般に多層とされている。先端チューブ部4は上記各種合成樹脂材料を使用して同じく管状に押出成形され、生体内の血管又は管腔等の複雑に屈曲部に挿入出来るよう、柔軟なものとされ、各種エラストマー材料も利用される。又カテーテルの挿入位置をX線により視認が必要とされる場合にはこれら管状部材にはBaSO、Bi等の造影剤が混入される。The shaft portion 2 is extruded into a tubular shape using the above-mentioned various synthetic resin materials, and pushability is required in addition to bendability depending on the intended use. Therefore, stainless steel, Ni-Ti alloy, etc. are present in the tube wall layer. A thin metal wire braid is inserted, and the synthetic resin layer is generally multi-layered. The distal end tube portion 4 is also extruded into a tubular shape using the above-mentioned various synthetic resin materials, and is flexible so that it can be inserted into a bent portion such as a blood vessel or a lumen in a living body. Various elastomer materials are also used. Is done. When it is necessary to visually confirm the insertion position of the catheter with X-rays, contrast agents such as BaSO 4 and Bi 2 O 3 are mixed in these tubular members.

カテーテルはシャフト部2、先端チューブ部4共に、それぞれの機能に合わせた管状部材が作製され使用されている。この管状部材の機械的な性質には、寸法、形状、材質と共に、管状部材作製時の延伸配向、及び結晶化による硬化が影響する。このような管状部材に対する伸長部の設定に当たっては、伸長部は設定部位、設定長等についてシャフト部2、先端チューブ部4のカテーテルとして要求される機能を阻害しないよう配慮して設定されなければならない。As for the catheter, a tubular member suitable for each function is prepared and used for both the shaft portion 2 and the distal tube portion 4. The mechanical properties of the tubular member are affected by the stretch orientation during the production of the tubular member and the hardening due to crystallization as well as the size, shape and material. In setting the extension part for such a tubular member, the extension part must be set in consideration of the setting site, the setting length, etc. so as not to impede the functions required of the catheter of the shaft part 2 and the tip tube part 4. .

シャフト部2、先端チューブ部4に対する伸長部の設定は、管状部材への設定位置、設定長さに見合うよう必要部以外を遮熱管等を用いて遮蔽して、伸長部設定部分のみを局所的に加熱することにより実施する。
上記伸長部設定のために行なう管状部材の局所的に加熱においては非加熱部の遮蔽に熱絶縁性のセラミック、ガラス、耐熱合成樹脂管を挿入し、伸長部設定部位には隙間を設けて、上記遮蔽から露出させ、該露出部を加熱することにより伸長部を設定する。
The extension part for the shaft part 2 and the distal end tube part 4 is set by locally shielding only the extension part setting part by using a heat shield tube etc. other than the necessary part to meet the setting position and the setting length for the tubular member. It is carried out by heating.
In the local heating of the tubular member to be performed for the extension part setting, a thermally insulating ceramic, glass, heat-resistant synthetic resin tube is inserted to shield the non-heating part, and a gap is provided in the extension part setting part. An extended portion is set by exposing the exposed portion and heating the exposed portion.

シャフト部2と先端チューブ部4の接着は温風、ヒーター、輻射熱照射、芯金材の高周波誘導等の各種方法で接着箇所を加熱、圧着して実施される。このシャフト部2、先端チューブ部4のいずれか一方或いは両者に伸長部を設定するに当たって、これ等の接着加熱時に伸長部部分を同時に加熱して伸長部とすことも可能である。また接着後に再度伸長部設定部位を加熱して伸長部としてもよい。Bonding of the shaft portion 2 and the tip tube portion 4 is performed by heating and pressure-bonding the bonding portion by various methods such as hot air, heater, radiant heat irradiation, high-frequency induction of the core metal material, and the like. The shaft portion 2, when setting an extension to either or both of the distal tube portion 4, it is also possible shall be the same time heated to extended portion an extension portion at the time of bonding the heating such as this. Alternatively, the elongated portion setting portion may be heated again after bonding to form an elongated portion.

延伸配向硬化部分は構成合成樹脂材料をその融点温度付近に加熱することにより、配向を緩和し、配向硬化を除去又は低減することが可能である。
また、結晶化樹脂の場合はその構成合成樹脂材料を結晶化温度以上に加熱し、急冷することにより結晶化度を低減することが出来る。
The stretched and cured portion can be relaxed by heating the constituent synthetic resin material near its melting point temperature, and the orientation and hardening can be removed or reduced.
In the case of a crystallized resin, the degree of crystallinity can be reduced by heating the constituent synthetic resin material to a temperature higher than the crystallization temperature and quenching.

カテーテルのシャフト部2と先端チューブ部4の間に伸長部として別部材よりなる管状部材を接着挿入する場合には、この伸長部の管状部材は作製時に延伸硬化しているものについては加熱処理により配向硬化を低減又は除去し、結晶化については非晶質材質によるもの、或いは前記方法で結晶化度を低減したものを使用する。また材質の異なるものとして前記各種合成樹脂材料に同種材のエラストマーを混合して使用することも出来る。When a tubular member made of another member is attached and inserted between the shaft portion 2 and the distal tube portion 4 of the catheter as an extended portion, the tubular member of the extended portion is stretched and cured at the time of production by heat treatment. The orientation hardening is reduced or removed, and the crystallization is performed using an amorphous material or the crystallinity reduced by the above method. Moreover, the same kind of elastomer can be mixed and used in the various synthetic resin materials as different materials.

次に伸長部の長さ決定として、カテーテルの接着部を想定した引張試験を実施した。試験片としては外径φ1.43mm、内径φ1.05mmのポリアミド−ポリアミドエラストマーで、一方はBaSO40wt%混入、ステンレス鋼編組入り3層管を、他方は同材でBi40wt%混入の単層管とし、両者の端部を0.5mm重ね合わせて溶融溶着した。試験片は片側25mm、全長50mmとし、先端チューブ部相当の単層管の溶着箇所隣接部分に伸長部を0mm〜20mmにわたり、長さを変えてそれぞれ設定した。引張試験機のチャック間距離30mmに固定し、速度200mm/min.で引張試験を実施した。Next, the tensile test which assumed the adhesion part of a catheter was implemented as length determination of an expansion | extension part. The test piece is a polyamide-polyamide elastomer having an outer diameter of φ1.43 mm and an inner diameter of φ1.05 mm. One is mixed with 40 wt% BaSO 4 and a stainless steel braided three-layer tube, and the other is mixed with Bi 2 O 3 40 wt%. The end portions of both were overlapped by 0.5 mm and melt welded. The test piece had a length of 25 mm on one side and a total length of 50 mm, and an extension portion was set to a portion adjacent to the welded portion of the single-layer tube corresponding to the tip tube portion over a length of 0 mm to 20 mm. The distance between chucks of the tensile tester is fixed to 30 mm, and the speed is 200 mm / min. A tensile test was performed.

図2(a)は、伸長部の設定のない先端チューブ部4を試験片として引張試験結果を示した。引張荷重を縦軸に、引張りによる破断に至るまでの変位を横軸にとってある。この場合3.4mm伸長変位した後、溶着箇所において引張荷重14.3Nで破断した。FIG. 2A shows the tensile test results using the tip tube portion 4 without the extension portion as a test piece. The vertical axis represents the tensile load, and the horizontal axis represents the displacement up to breakage due to tension. In this case, after displacement by 3.4 mm, the welded portion was broken at a tensile load of 14.3 N.

図2(b)は、5mmの長さの伸長部を設けた先端チューブ部4を試験片として引張試験における破断に至るまでの引張荷重と変位をとった結果を示した。印加する引張荷重が伸長部の降伏点荷重の14N程度に達すると伸長部の伸長が始まり、この伸長部における伸長が33.4mmに達し、引張荷重15.4Nで溶着箇所で破断した。引張荷重と引張伸長変位の関係は、この図に示されるように伸長開始点の14Nまでは伸長部における伸長は殆どなく、この点に達すると伸長部の伸長が開始され、引張荷重の漸増と共に伸長変位は大きくなり、引張荷重が溶着強度に達すると溶着箇所で破断した。FIG. 2B shows the result of taking the tensile load and displacement until the fracture in the tensile test using the tip tube portion 4 provided with the extension portion having a length of 5 mm as a test piece. When the applied tensile load reached about 14N of the yield point load of the extended portion, the extended portion started to expand, the extension in this extended portion reached 33.4 mm, and fractured at the weld location with a tensile load of 15.4N. As shown in this figure, there is almost no elongation at the extension part until the extension start point 14N, as shown in this figure. When this point is reached, extension of the extension part starts, and along with the gradual increase of the tensile load, The elongation displacement increased, and when the tensile load reached the welding strength, it broke at the welding location.

伸長部の機械的強度は先端チューブ部本体と較べ延伸配向硬化除去相当分だけ低い。この試験片に引張荷重が印加されると、伸長部はこの機械的強度の降伏点までは他部と同様に耐える。引張荷重がこの降伏点荷重に達すると伸長部は伸長を開始する。伸長部には合成樹脂材料の伸長に伴って合成樹脂材料中の高分子の配向が起り、引張荷重印加と上記配向硬化が平衡しながら伸長が継続される。その後、引張荷重が溶着箇所の溶着強度に至るとこの溶着箇所で破断する。The mechanical strength of the elongated portion is lower by an amount corresponding to the removal of stretched orientation and hardening than the tip tube portion main body. When a tensile load is applied to the specimen, the stretched part will withstand the yield point of this mechanical strength in the same way as the other parts. When the tensile load reaches this yield point load, the extension starts to expand. As the synthetic resin material elongates, the polymer in the synthetic resin material is oriented in the elongated portion, and the elongation is continued while the application of the tensile load and the orientation hardening are balanced. Thereafter, when the tensile load reaches the welding strength at the welding location, the welding location breaks.

図3(a)は、上記試験片の先端チューブ部4に0mm〜20mmにわたって伸長部の長さを変えて設定したものについて、伸長部の長さと引張りによる破断荷重との関係の測定結果を示した。破断はいずれも溶着箇所で起り、破断荷重は伸長部の長さにかゝわらず15N前後の値となっいる。
図3(b)にはこの実験における引張荷重印加による破断に至るまでの伸長部の伸長変位と、伸長部の設定長さとの関係を示した。
伸長部の設定のないものでは引張試験における伸長変位は3.4mmと殆ど伸長がないが、伸長部が5mm以上になると伸長変位は33mmに達し、後は伸長部の長さと関係なく、35mm前後の伸長変位となっている。
FIG. 3 (a) shows the measurement results of the relationship between the length of the extended portion and the breaking load due to tension, with respect to the tip tube portion 4 of the test piece set by changing the length of the extended portion from 0 mm to 20 mm. It was. Fracture occurs at any bonded portion, the breaking load is a length corresponding to orゝWarazu 15N around values of extension portion.
FIG. 3B shows the relationship between the extension displacement of the extension part up to the breakage due to the application of a tensile load in this experiment and the set length of the extension part.
In the case where there is no setting of the extension part, the extension displacement in the tensile test is almost 3.4 mm, but there is almost no extension, but when the extension part becomes 5 mm or more, the extension displacement reaches 33 mm, and after that, regardless of the length of the extension part, about 35 mm This is the extension displacement.

上記実験結果に基づき、カテーテルへ伸長部を設定するにあたり、その設定部位、設定長さ等カテーテルを構成するシャフト部、先端チューブ部の形状、寸法、材質等に応じて、それぞれの性能を阻害しないように配慮して伸長部は設定される。
伸長部の設定にあたり、この実験範囲での伸長部の長さに対し、伸長変位はほぼ同じ値を示すことにより、伸長部の設定自由度は大きく、伸長部の設定は容易と考えられる。
Based on the above experimental results, in setting the extension part to the catheter, its performance is not hindered according to the shape, dimensions, material, etc. of the shaft part and tip tube part constituting the catheter, such as the setting part, setting length, etc. Thus, the extension part is set.
In setting the extension part, the extension displacement shows almost the same value as the extension part in the experimental range, so that the degree of freedom in setting the extension part is large, and the setting of the extension part is considered easy.

上記は一事例による伸長部の設定に関する結果であり、記載の通りカテーテルは種類により、寸法、形状、構成材料が各種あるため、それぞれに応じた適切な伸長部設定が好ましく、上記事例にこだわることなく任意に選択されるものとする。The above is the result regarding the setting of the extension part according to one example, and as described, there are various types of dimensions, shapes, and constituent materials for the catheter, so appropriate extension part setting according to each is preferable, and stick to the above example It is assumed that it is arbitrarily selected.

以下、本発明を実施例によって説明する。但し本発明は以下に示される実施例のみに限定されるものではない。Hereinafter, the present invention will be described by way of examples. However, the present invention is not limited to only the examples shown below.

カテーテルとして図1の構成のものへの本発明の実施例である。図1におけるシャフト部2は長さ950mmの管状部材であり、ポリアミドとポリアミドエラストマーの混合材にBaSOを40wt%混入したものを素材とした。即ち前記合成樹脂素材の下層を管状に押出成形し、この上にステンレス鋼細線を編組し、この編組3上に上層として前記合成樹脂素材を2層に押出成形してコーティングした。その肉厚は上記編組材入り3層成形で0.2mm、外径はφ1.4mm、内径はφ1.0mmとした。It is an Example of this invention to the thing of the structure of FIG. 1 as a catheter. The shaft portion 2 in FIG. 1 is a tubular member having a length of 950 mm, and a material obtained by mixing 40 wt% of BaSO 4 into a mixed material of polyamide and polyamide elastomer. That is, the lower layer of the synthetic resin material was extruded into a tubular shape, a stainless steel fine wire was braided thereon, and the synthetic resin material was extruded into two layers as an upper layer on the braid 3 and coated. The thickness was 0.2 mm, the outer diameter was φ1.4 mm, and the inner diameter was φ1.0 mm in the three-layer molding with the braided material.

先端チューブ部4は全長30mmの同じく管状部材で、ポリアミドとポリアミドエラストマーの混合材にBiを40wt%混入したものを素材とし、単層に押出成形した。カテーテルの最先端側にはチップ部6を溶着した。このチップ部6の長さは1.0mmで材質は先端チューブ部4と同質であるが、更に柔軟なものとしている。The distal end tube portion 4 is a tubular member having a total length of 30 mm, and a mixture of polyamide and polyamide elastomer mixed with 40 wt% Bi 2 O 3 is used as a raw material, and is extruded into a single layer. A tip portion 6 was welded to the most distal side of the catheter. The tip portion 6 has a length of 1.0 mm and is made of the same material as the tip tube portion 4, but is made more flexible.

シャフト部2の先端側には先端チューブ部4を溶着し、溶着箇所5とした。該溶着箇所5において、シャフト部2と先端チューブ部4の溶着端は0.5mm相互に重ね合わせて溶着した。この溶着においてはそれぞれの合成樹脂を融点以上に加熱溶融させ、同時に重ね合わせ部に外周より他部と同径になるよう外圧を印加して溶着した。
本実施例では、溶着箇所5に隣接して、先端チューブ部4に5mmの長さの伸長部を溶着と同時に加熱することにより設定した。この加熱処理は加熱範囲を限定して実施するため、熱絶縁性セラミック管を外挿し、加熱範囲外の部分を遮蔽し、溶着箇所5と伸長部を露出し、輻射熱照射により局所加熱して実施した。
A distal end tube portion 4 is welded to the distal end side of the shaft portion 2 to obtain a welded portion 5. At the welding location 5, the welding ends of the shaft portion 2 and the tip tube portion 4 were overlapped with each other by 0.5 mm and welded. In this welding, each synthetic resin was heated and melted to the melting point or more, and at the same time, an external pressure was applied to the overlapped portion from the outer periphery so as to have the same diameter as the other portions.
In the present example, an extension portion having a length of 5 mm was adjacent to the welding location 5 and heated at the same time as the welding. Since this heat treatment is performed by limiting the heating range, the heat insulating ceramic tube is extrapolated, the portion outside the heating range is shielded, the welded portion 5 and the elongated portion are exposed, and the heating is performed locally by radiant heat irradiation. did.

この溶着箇所5へ隣接して先端チューブ部4の局所加熱により、先端チューブ部4に延伸配向硬化は除去され伸長部を設定することが出来た。この先端チューブ部4は次工程において、先端形状成形用の芯金を挿入し加熱することにより、カテーテルの仕様に合わせた形状付与を行なった。次にシャフト部2の手元側端にカテーテルハブ1を接着してカテーテルの組立てを完了した。
本実施例における伸長部の設定部位を図4に示した。図4に示す7が伸長部となる。
By the local heating of the tip tube portion 4 adjacent to the welded portion 5, the stretch orientation hardening was removed from the tip tube portion 4 and an extension portion could be set. In the next step, the distal tube portion 4 was provided with a shape in accordance with the specification of the catheter by inserting and heating a core metal for shaping the distal end shape. Next, the catheter hub 1 was adhered to the proximal end of the shaft portion 2 to complete the assembly of the catheter.
The setting part of the extending part in the present embodiment is shown in FIG. Reference numeral 7 shown in FIG.

本実施例で作製したカテーテルのシャフト部2と先端チューブ部4との溶着箇所5と伸長部7を介して引張試験を実施した。引張試験の結果は前記実験結果の図2(b)の結果とほぼ一致した。溶着箇所5への引張荷重の印加は先端チューブ部4に設定した伸長部7が約35mm伸長した後となり、引張荷重の直接印加は緩和されたものとなった。A tensile test was performed through the welded portion 5 and the elongated portion 7 of the shaft portion 2 and the distal tube portion 4 of the catheter produced in this example. The result of the tensile test almost coincided with the result of FIG. The tensile load was applied to the welded portion 5 after the elongated portion 7 set in the distal tube portion 4 was elongated by about 35 mm, and the direct application of the tensile load was relaxed.

本実施例では、シャフト部2と先端チューブ部4との両者端を直接溶着することなく、この間に両者又はそのいずれか一方により伸び特性の良好な管状部材を伸長部として介在させた構造のものとした。
カテーテルとしては実施例1と同じカテーテルへの適用を行なった。シャフト部2と先端チューブ部4との間に、両者と同種の合成樹脂よりなり先端チューブ部4に混合したBiの混入量を40wt%より20wt%に低減した材料を伸長部の材料に使用した。
In this embodiment, both ends of the shaft portion 2 and the tip tube portion 4 are not directly welded, and a tubular member having a good elongation characteristic is interposed between them or one of them as an extension portion. It was.
The catheter was applied to the same catheter as in Example 1. The material of the extension portion is made of the same kind of synthetic resin as that of the shaft portion 2 and the tip tube portion 4 and the mixed amount of Bi 2 O 3 mixed in the tip tube portion 4 is reduced from 40 wt% to 20 wt%. Used for.

伸長部へのBiの混入量を40wt%より20wt%に低減することにより、伸び特性は良好なものとなり、且つ合成樹脂素材をシャフト部2、先端チューブ部4と同一なものとすることにより、この伸長部とシャフト部2、先端チューブ部4のそれぞれとの溶着も容易に行なわれた。伸長部となる管状部材はシャフト部2と先端チューブ部4と同径、同肉厚とし、その長さはこの場合も5mmとして両者間に挿入した。
この場合のそれぞれへの溶着条件は若干異なるが、同一温度で加熱と加圧により溶着が可能となり、この際の溶着加熱により上記伸長部の管状部材は延伸配向硬化も低減除去された。
By reducing the amount of Bi 2 O 3 mixed into the elongated portion from 40 wt% to 20 wt%, the elongation characteristics are improved, and the synthetic resin material is the same as the shaft portion 2 and the tip tube portion 4. As a result, welding between the elongated portion and each of the shaft portion 2 and the tip tube portion 4 was also easily performed. The tubular member serving as the elongated portion had the same diameter and the same thickness as the shaft portion 2 and the tip tube portion 4, and the length thereof was 5 mm in this case as well, and was inserted between them.
In this case, although the welding conditions for each were slightly different, welding was possible by heating and pressurization at the same temperature, and the tubular member of the elongated portion was also reduced and removed by stretching heating at this time.

図5に本実施例における伸長部の構造を示した。図5の8が伸長部となる管状部材であり、シャフト部2、先端チューブ部4間の引張試験において溶着箇所での破断に至るまでの伸長部8の伸長に関しては前記例と同様の挙動を示した。FIG. 5 shows the structure of the elongated portion in this example. In FIG. 5, reference numeral 8 denotes a tubular member serving as an elongated portion. In the tensile test between the shaft portion 2 and the tip tube portion 4, the elongation portion 8 extends to the fracture at the welded portion, and the same behavior as in the above example is observed. Indicated.

本発明のカテーテルは生体内から抜去する際の引張荷重がシャフト部と先端チューブ部との接着箇所に集中することを防止され、抜去操作が良好に実施出来る。In the catheter of the present invention, it is possible to prevent the tensile load when being extracted from the living body from being concentrated on the adhesion portion between the shaft portion and the tip tube portion, and to perform the extraction operation satisfactorily.

生体挿入用カテーテルの構成図Configuration diagram of catheter for living body insertion シャフト部材と先端チューブ部材を溶着し、先端チューブ部に伸長部を設定しないもの(a)と5mmの長さの伸長部を設定したもの(b)の引張試験結果を示したグラフThe graph which showed the tensile test result of (a) which set the extension part of length (a) which does not set an extension part in a tip tube part, and (b) which welded a shaft member and a tip tube part シャフト部材と先端チューブ部材を溶着し、先端チューブ部に伸長部を0mm〜20mmにわたって長さを変えて設定した試験片の引張試験結果を示したグラフ(a)伸長部の設定長さと引張破断荷重(b)伸長部の設定長さと引張破断に至るまでの伸長変位A graph showing the tensile test results of a test piece in which a shaft member and a tip tube member are welded and an extension portion is set to the tip tube portion by changing the length from 0 mm to 20 mm. (A) Set length of extension portion and tensile breaking load (B) Elongation displacement until the set length of the extension and the tensile break シャフト部材と先端チューブ部材を溶着し、その溶着箇所に隣接して先端チューブ部に配向硬化を除去して設定した伸長部の部分拡大図Partial enlarged view of the elongated portion set by welding the shaft member and the tip tube member and removing the orientation hardening in the tip tube portion adjacent to the welding location. シャフト部と先端チューブ部間に別部材で設けた伸長部の部分拡大図Partial enlarged view of the extension provided as a separate member between the shaft and the tip tube

1 カテーテルハブ
2 シャフト部
3 シャフト部管壁層中のステンレス鋼細線編組
4 先端チューブ部
5 接着箇所
6 チップ部
7 配向硬化除去した伸長部
8 X線造影剤混入量を低減した伸長部
DESCRIPTION OF SYMBOLS 1 Catheter hub 2 Shaft part 3 Stainless steel thin wire braid in shaft part tube wall layer 4 End tube part 5 Adhesion location 6 Tip part 7 Extension part which removed orientation hardening 8 Extension part which reduced X-ray contrast agent mixing amount

Claims (2)

合成樹脂の管状部材により構成されたシャフト部及び先端チューブ部を備え、前記シャフト部に先端チューブ部を接着した生体挿入用カテーテルにおいて、
前記シャフト部と前記先端チューブ部の接着箇所に、前記シャフト部及び前記先端チューブ部よりも低い降伏点荷重値材料によって形成された伸長部を備えたことを特徴とする生体挿入用カテーテル。
A living body insertion catheter comprising a shaft portion and a tip tube portion made of a synthetic resin tubular member, wherein the tip tube portion is bonded to the shaft portion,
A living body insertion catheter comprising an elongated portion formed of a material having a lower yield point load value than that of the shaft portion and the tip tube portion at a bonding portion between the shaft portion and the tip tube portion .
前記シャフト部及び前記先端チューブ部の少なくとも一方X線視認用造影剤を混入した合成樹脂から構成され、
前記伸張部は、前記X線視認用造影剤を混入しない合成樹脂又は前記X線視認用造影剤を混入した前記シャフト部もしくは前記先端チューブよりも前記X線視認用造影剤の混入量が少ない合成樹脂から構成されていることを特徴とする請求項1に記載の生体挿入用カテーテル。
At least one of the shaft portion and the tip tube portion is composed of a synthetic resin mixed with an X-ray visual contrast agent ,
The extension portion is a synthetic resin in which the contrast agent for X-ray viewing is not mixed, or the amount of the contrast agent for X-ray viewing is less than that of the shaft portion or the tip tube mixed with the contrast agent for X-ray viewing. The living body insertion catheter according to claim 1 , which is made of resin .
JP2003421725A 2003-12-19 2003-12-19 Living body insertion catheter Expired - Lifetime JP4407270B2 (en)

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