JPH04261666A - Catheter - Google Patents
CatheterInfo
- Publication number
- JPH04261666A JPH04261666A JP3149256A JP14925691A JPH04261666A JP H04261666 A JPH04261666 A JP H04261666A JP 3149256 A JP3149256 A JP 3149256A JP 14925691 A JP14925691 A JP 14925691A JP H04261666 A JPH04261666 A JP H04261666A
- Authority
- JP
- Japan
- Prior art keywords
- main body
- catheter
- flexibility
- tip
- distal end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005452 bending Methods 0.000 claims description 12
- 210000004204 blood vessel Anatomy 0.000 abstract description 18
- 238000003780 insertion Methods 0.000 abstract description 5
- 230000037431 insertion Effects 0.000 abstract description 5
- 239000004952 Polyamide Substances 0.000 description 4
- 208000007536 Thrombosis Diseases 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 239000000806 elastomer Substances 0.000 description 4
- 229920002647 polyamide Polymers 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000560 biocompatible material Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
Landscapes
- Media Introduction/Drainage Providing Device (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明はカテーテルに関し、さら
に詳しくは血管等への挿入を円滑に行うことができるカ
テーテルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catheter, and more particularly to a catheter that can be smoothly inserted into a blood vessel or the like.
【０００２】0002
【従来の技術】図１に示すようなカテーテル１は、例え
ばガイドワイヤ等に導かれて、血管等体腔内に挿入され
、その先端の方向を制御されつつ目的の部位に到達可能
とされ、治療や検査を行うことを可能としている。2. Description of the Related Art A catheter 1 as shown in FIG. 1 is guided by a guide wire or the like and inserted into a body cavity such as a blood vessel, and the direction of its tip is controlled so that it can reach a target site and perform treatment. This makes it possible to carry out inspections.
【０００３】そこで、このカテーテル１にあっては、本
体部２にある程度の硬さすなわち比較的小なる可撓性を
備えることを必要とされるとともに、先端部３にある程
度の柔軟さすなわち比較的大なる可撓性を備えることを
必要とされる。特に血管系のカテーテル１においては、
その本体部２は押込み力を先端部３にまで伝えるために
先端部３の近傍まである程度の硬さすなわち比較的小な
る可撓性が必要である。他方、先端部３にはカテーテル
１の種類によって各種の湾曲した形状が予めつけられて
おり、挿入する際にはその湾曲した形状がガイドワイヤ
に沿うような柔軟さを有し、ガイドワイヤに沿って直線
状になることによって挿入を容易とし、更に心臓や血管
に留置するに際してその内壁に損傷を生じないような柔
軟さすなわち比較的大なる可撓性が必要である。Therefore, in this catheter 1, the main body portion 2 is required to have a certain degree of hardness, that is, relatively small flexibility, and the distal end portion 3 is required to have a certain degree of flexibility, that is, relatively small flexibility. It is required to have great flexibility. Especially in the catheter 1 for the vascular system,
In order to transmit the pushing force to the tip 3, the main body 2 needs to have a certain degree of hardness, that is, relatively small flexibility, up to the vicinity of the tip 3. On the other hand, the distal end portion 3 has various curved shapes in advance depending on the type of catheter 1, and when inserted, the curved shape is flexible enough to follow the guide wire. It is necessary to have a straight shape for easy insertion, and also to have a relatively large flexibility so as not to damage the inner wall of the heart or blood vessel when it is placed in the heart or blood vessel.
【０００４】よって、カテーテル１において、本体部２
と先端部３とは、それぞれ、それらの略全域に略一定の
硬さすなわち比較的小なる可撓性と、柔軟さすなわち比
較的大なる可撓性とを有することが望まれる。[0004] Therefore, in the catheter 1, the main body 2
It is desired that the tip portion 3 and the tip portion 3 have substantially constant hardness, that is, relatively small flexibility, and softness, that is, relatively large flexibility, over substantially the entire area thereof.
【０００５】[0005]
【発明が解決しようとする課題】従来、上記のような可
撓性が比較的小なる本体部２と、可撓性が比較的大なる
先端部３とからなるカテーテル１として、本体部２と先
端部３とを接着剤や融着等によって接続してなるカテー
テル１が提案されている。しかしながら、上記従来提案
されているカテーテル１にあっては、製作工程が煩雑に
なるとともに、本体部２と先端部３との接続部に段差を
生じ、血管等への挿入を円滑に行うことが困難であり、
血栓を生ずるおそれがある。また、本体部２と先端部３
との接続不良により、両者間での離脱にともなう切断等
を生ずるおそれがある。[Problems to be Solved by the Invention] Conventionally, a catheter 1 consisting of a main body portion 2 having relatively low flexibility as described above and a distal end portion 3 having relatively high flexibility has been constructed. A catheter 1 has been proposed in which the distal end portion 3 is connected with an adhesive, fusion, or the like. However, in the conventionally proposed catheter 1, the manufacturing process is complicated, and there is a step at the connection between the main body part 2 and the distal end part 3, making it difficult to smoothly insert the catheter into a blood vessel or the like. difficult,
May cause blood clots. In addition, the main body part 2 and the tip part 3
There is a risk of disconnection due to separation between the two due to a poor connection between the two.
【０００６】本発明は、本体部と先端部とが、それぞれ
、それらの略全域に略一定の硬さと柔軟さとを有し、か
つ両者間に段差を形成することなく一体に成形されてな
るカテーテルを提供することを目的とする。[0006] The present invention provides a catheter in which the main body portion and the distal end portion each have substantially constant hardness and flexibility over substantially the entire area thereof, and are integrally molded without forming a step between the two. The purpose is to provide
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、可撓性が比較的小なる管状本体部と、可
撓性が比較的大なる管状先端部とが軸方向に一体に成形
されてなるカテーテルにおいて、該カテーテルは該本体
部と該先端部に連続する少なくとも内管部と外管部とを
有し、該本体部と該先端部とで肉厚の異なる内管部の外
面に、外管部を被覆成形してなり、内管部と外管部の２
つの管部のうち、先端部における肉厚が他方の管部に比
して厚肉でありかつ本体部における肉厚が他方の管部に
比して薄肉である方の管部の可撓性を他方の管部の可撓
性に比してより大とし、該本体部における内管部と外管
部の肉厚をそれぞれ一定とし、かつ該先端部における内
管部と外管部の肉厚もそれぞれ一定とし、該本体部と該
先端部とが両者間に段差を形成することなく一体に成形
されているようにしたものである。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a structure in which a tubular body portion having a relatively low flexibility and a tubular tip portion having a relatively large flexibility are arranged in the axial direction. In a catheter formed integrally, the catheter has at least an inner tube portion and an outer tube portion continuous with the main body portion and the distal end portion, and the inner tube has a wall thickness different between the main body portion and the distal end portion. The outer tube part is coated and molded on the outer surface of the inner tube part and the outer tube part.
Flexibility of one of the two tube sections, which has a thicker wall thickness at the tip than the other tube section and a thinner wall thickness at the main body than the other tube section. is greater than the flexibility of the other tube, the inner and outer tubes of the main body have constant wall thicknesses, and the inner and outer tubes at the tip have a greater flexibility than the other tube. The thickness is also constant, and the main body portion and the tip portion are integrally molded without forming a step between the two.
【０００８】また、本発明は、本体部の曲げ弾性率が２
８００〜３２００ｋｇ／ｃｍ２であり、先端部の曲げ弾
性率が１０００〜１４００ｋｇ／ｃｍ２であるようにし
たものである。[0008] Further, in the present invention, the bending elastic modulus of the main body is 2.
800 to 3200 kg/cm2, and the bending elastic modulus of the tip part is 1000 to 1400 kg/cm2.
【０００９】また、本発明は、カテーテルの外径と内径
とが本体部と先端部にわたり、ともに均一であるように
したものである。Further, according to the present invention, the outer diameter and inner diameter of the catheter are uniform over both the main body portion and the distal end portion.
【００１０】また、本発明は、本体部と先端部とがその
内面及び外面に段差を生じることなく滑らかに連続して
なるようにしたものである。Further, according to the present invention, the main body portion and the distal end portion are smoothly continuous with each other without forming a step on the inner and outer surfaces thereof.
【００１１】また、本発明は、本体部と先端部との境界
部分における肉厚が滑らかに変化するものであるように
したものである。Further, according to the present invention, the wall thickness at the boundary between the main body portion and the tip portion changes smoothly.
【００１２】0012
【実施例】図２は本発明の第１実施例に係るカテーテル
１０を示す断面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is a sectional view showing a catheter 10 according to a first embodiment of the present invention.
【００１３】カテーテル１０は、図２に示すように、長
さＬ１ の本体部１１と長さＬ２ の先端部１２とが軸
方向に一体成形されており、本体部１１と先端部１２と
で肉厚の異なる内管部１３の上面に、外管部１４を被覆
成形している。ここで、内管部１３は、略一定内径で、
本体部１１における肉厚を厚く、先端部１２における肉
厚を薄く設定されている。また、外管部１４は、略一定
外径で、本体部１１における肉厚を薄く、先端部１２に
おける肉厚を厚く設定されている。なお、各内管部１３
、外管部１４の、本体部１１と先端部１２との境界部分
における肉厚変化は、図２に示すように階段状でなく、
テーパ状の滑らかな変化とされている。As shown in FIG. 2, the catheter 10 has a main body 11 having a length L1 and a distal end 12 having a length L2 that are integrally molded in the axial direction. An outer tube section 14 is formed to cover the upper surface of an inner tube section 13 having different thicknesses. Here, the inner tube portion 13 has a substantially constant inner diameter,
The wall thickness at the main body portion 11 is set to be thick, and the wall thickness at the distal end portion 12 is set to be thin. Further, the outer tube portion 14 has a substantially constant outer diameter, with a thin wall thickness at the main body portion 11 and a thick wall thickness at the distal end portion 12. In addition, each inner tube part 13
, the thickness change at the boundary between the main body 11 and the tip 12 of the outer tube 14 is not step-like as shown in FIG.
It is said to be a smooth taper-like change.
【００１４】ここで、内管部１３は、その肉厚が本体部
１１においてより厚肉とされていることから、その可撓
性を外管部１４の可撓性に比してより小とされ、例えば
曲げ弾性率２８００〜３２００ｋｇ／ｃｍ２、好ましく
は３０００ｋｇ／ｃｍ２のポリアミドエラストマーから
形成されている。これに対し、外管部１４は、その可撓
性を比較的大とされ、例えば曲げ弾性率１０００〜１４
００ｋｇ／ｃｍ２、好ましくは１２００ｋｇ／ｃｍ２の
ポリアミドエラストマーから形成されている。すなわち
、カテーテル１０の本体部１１は、その厚肉構成部分を
比較的可撓性の小なる内管部１３によって形成され、全
体としてその可撓性を比較的小とされている。またカテ
ーテル１０の先端部１２は、その厚肉構成部分を比較的
可撓性の大なる外管部１４によって形成され、全体とし
てその可撓性を比較的大とされている。Here, since the wall thickness of the inner tube portion 13 is thicker than that of the main body portion 11, its flexibility is smaller than that of the outer tube portion 14. For example, it is made of polyamide elastomer with a bending modulus of 2800 to 3200 kg/cm2, preferably 3000 kg/cm2. On the other hand, the outer tube portion 14 has relatively high flexibility, for example, a bending elastic modulus of 1000 to 14
00 kg/cm2, preferably 1200 kg/cm2 of polyamide elastomer. That is, the main body portion 11 of the catheter 10 has a thick walled component formed by the relatively flexible inner tube portion 13, and has relatively low flexibility as a whole. Further, the distal end portion 12 of the catheter 10 has a thick walled component formed by a relatively flexible outer tube portion 14, and has relatively high flexibility as a whole.
【００１５】そして、本体部１１における内管部１３の
肉厚は上述の如くの厚肉状にて一定とし、かつ本体部１
１における外管部１４の肉厚は上述の如くの薄肉状にて
一定としている。また、先端部１２における内管部１３
の肉厚は上述の如くの薄肉状にて一定とし、かつ先端部
１２における外管部１４の肉厚は上述の如くの厚肉状に
て一定としている。すなわち、カテーテル１０にあって
は、本体部１１における内管部１３と外管部１４の肉厚
をそれぞれ一定とされ、結果として、本体部１１の略全
域に略一定の硬さすなわち比較的小なる可撓性を有する
。また、先端部１２における内管部１３と外管部１４の
肉厚もそれぞれ一定とされ、結果として先端部１２の略
全域に略一定の柔軟さすなわち比較的大なる可撓性を有
する。The wall thickness of the inner tube part 13 in the main body part 11 is kept constant in the thick shape as described above, and the inner tube part 13 in the main body part 11 is
The wall thickness of the outer tube portion 14 in No. 1 is thin and constant as described above. Moreover, the inner tube part 13 in the tip part 12
The wall thickness of the outer tube section 14 at the distal end portion 12 is constant and thin as described above, and the thickness of the outer tube section 14 is constant as described above. That is, in the catheter 10, the inner tube part 13 and the outer tube part 14 in the main body part 11 have a constant wall thickness, and as a result, the main body part 11 has a substantially constant hardness, that is, a relatively small thickness. It has flexibility. Further, the wall thicknesses of the inner tube portion 13 and the outer tube portion 14 in the tip portion 12 are each made constant, and as a result, the tip portion 12 has substantially constant flexibility, that is, relatively large flexibility, over substantially the entire area.
【００１６】なお、上記カテーテル１０においては、各
内管部１３、外管部１４の、本体部１１と先端部１２と
の境界領域における肉厚変化が図２に示すように滑らか
に変化せしめられていることから、カテーテル１０の本
体部１１と先端部１２との可撓性の変化も滑らかなもの
となっており、血管内等への挿入を円滑に行うことがで
きる。In the catheter 10, the wall thickness of each of the inner tube section 13 and the outer tube section 14 in the boundary region between the main body section 11 and the distal end section 12 changes smoothly as shown in FIG. Therefore, the flexibility changes smoothly between the main body portion 11 and the distal end portion 12 of the catheter 10, allowing smooth insertion into a blood vessel or the like.
【００１７】しかして、このカテーテル１０にあっては
、本体部１１の端部にカテーテルハブを接続し、先端部
１２に必要な屈曲形状を与えられた後、使用に供される
。The catheter 10 is put into use after the catheter hub is connected to the end of the main body 11 and the distal end 12 is given a necessary bent shape.
【００１８】すなわち、上記第１実施例によれば、本体
部１１と先端部１２とが、それぞれ、それらの略全域に
略一定の硬さと柔軟さとを有して一体に成形されるカテ
ーテル１０を得ることが可能となる。ここで、カテーテ
ル１０の本体部１１および先端部１２の内径は内管部１
３によって形成され、それらの外径は外管部１４によっ
て形成され、したがって、本体部１１と先端部１２との
境界領域の内面および外面に段差を生ずることがなく、
血管等への挿入を円滑に行うことが可能となるとともに
、血栓を生ずることがなく、また本体部１１と先端部１
２との間で離脱を生ずるおそれもない。That is, according to the first embodiment, the catheter 10 is provided in which the main body portion 11 and the distal end portion 12 are integrally molded with substantially constant hardness and flexibility over substantially the entire area thereof. It becomes possible to obtain. Here, the inner diameter of the main body part 11 and the tip part 12 of the catheter 10 is the inner diameter of the inner tube part 1.
3, and their outer diameter is formed by the outer tube part 14, so that there is no step between the inner and outer surfaces of the boundary area between the main body part 11 and the tip part 12,
This allows for smooth insertion into a blood vessel, etc., and prevents the formation of blood clots.
There is no risk of separation between the two parties.
【００１９】次に、上記カテーテル１０の製造方法につ
いて説明する。まず、本体部１１の肉厚が先端部１２の
肉厚より厚く、その可撓性が比較的小なる内管部１３を
押出し成形等により作製する。例えば、曲げ弾性率３０
００ｋｇ／ｃｍ２のポリアミドエラストマーで本体部１
１が内径１．４ｍｍ 、外径２．１ｍｍ であり、先端
部１２が内径１．４ｍｍ 、外径１．６ｍｍ である内
管部１３を形成する。次に、上記内管部１３の上面に、
内管部１３に比してその可撓性が比較的大なる外管部１
４を被覆する。例えば、曲げ弾性率１２００ｋｇ／ｃｍ
２のポリアミドエラストマーで外径２．３ｍｍ の外管
部１４を被覆する。次に、上記のようにして一体成形さ
れた内管部１３および外管部１４を必要な長さに切断し
、カテーテル１０を得る。Next, a method for manufacturing the catheter 10 will be explained. First, the inner tube part 13, in which the main body part 11 is thicker than the tip part 12 and has relatively little flexibility, is manufactured by extrusion molding or the like. For example, the bending modulus is 30
Main body part 1 is made of polyamide elastomer of 00 kg/cm2.
1 has an inner diameter of 1.4 mm and an outer diameter of 2.1 mm, and the tip 12 forms an inner tube portion 13 with an inner diameter of 1.4 mm and an outer diameter of 1.6 mm. Next, on the upper surface of the inner tube part 13,
Outer tube portion 1 having relatively greater flexibility than inner tube portion 13
Cover 4. For example, bending elastic modulus 1200 kg/cm
The outer tube portion 14 having an outer diameter of 2.3 mm is coated with the polyamide elastomer No. 2. Next, the inner tube portion 13 and outer tube portion 14 integrally molded as described above are cut to a required length to obtain the catheter 10.
【００２０】図３は本発明の第２実施例に係るカテーテ
ル２０を示す断面図である。FIG. 3 is a sectional view showing a catheter 20 according to a second embodiment of the present invention.
【００２１】このカテーテル２０が前記カテーテル１０
と異なる点は、内管部１３と外管部１４との間に、例え
ば線径０．０８ｍｍのステンレス鋼線からなるワイヤ層
２１を例えばピッチ１ｍｍ で編んだ点のみにある。さ
らに詳述すると、ワイヤ層２１は本体部１１の一定の肉
厚を有する内管部１３、外管部１４の間に設けている。
本体部１１と先端部１２との境界部分にワイヤ層２１が
存在しないことにより急激な可撓性の変化がなくキンク
しにくい。[0021] This catheter 20 is similar to the catheter 10.
The only difference is that a wire layer 21 made of, for example, stainless steel wire with a wire diameter of 0.08 mm is woven at a pitch of, for example, 1 mm between the inner tube portion 13 and the outer tube portion 14. More specifically, the wire layer 21 is provided between the inner tube section 13 and the outer tube section 14 having a constant wall thickness of the main body section 11 . Since the wire layer 21 is not present at the boundary between the main body portion 11 and the tip portion 12, there is no sudden change in flexibility and kinks are less likely to occur.
【００２２】したがって、この第２実施例によれば、上
記カテーテル１０と同様な本体部１１と先端部１２とを
確実にかつ両者間に段差を形成することなく一体成形可
能とするとともに、本体部１１のねじり剛性を大とし、
本体部１１に加えるねじり操作によって先端部１２をよ
り適確に方向づけることが可能なカテーテル２０を得る
ことが可能となる。Therefore, according to the second embodiment, the main body part 11 and the distal end part 12, which are similar to those of the catheter 10, can be integrally molded reliably and without forming a step between the two, and the main body part The torsional rigidity of 11 is increased,
It becomes possible to obtain a catheter 20 in which the distal end portion 12 can be directed more accurately by a twisting operation applied to the main body portion 11.
【００２３】なお、上記各実施例は、内管部１３の肉厚
が本体部１１においてより厚肉とされ、内管部１３の可
撓性を外管部１４の可撓性に比してより小とする場合に
ついて説明した。しかしながら、本発明に係るカテーテ
ルにあっては、図４に示すカテーテル３０におけるよう
に、内管部１３Ａの肉厚が本体部１１Ａにおいてより薄
肉とされ、先端部１２Ａにおいてより厚肉とされ、内管
部１３Ａの可撓性を外管部１４Ａの可撓性に比してより
大とするものであってもよい。これにより、手元のトル
クが先端まで伝わりやすい。Note that in each of the above embodiments, the wall thickness of the inner tube portion 13 is made thicker than that of the main body portion 11, and the flexibility of the inner tube portion 13 is made smaller than that of the outer tube portion 14. The case where it is made smaller has been explained. However, in the catheter according to the present invention, as in the catheter 30 shown in FIG. The flexibility of the tube portion 13A may be greater than the flexibility of the outer tube portion 14A. This makes it easier for the torque at hand to be transmitted to the tip.
【００２４】なお、このカテーテル３０にあっては、本
体部１１Ａにおける内管部１３Ａの肉厚を上述の如くの
薄肉状にて一定とし、かつ本体部１１Ａにおける外管部
１４Ａの肉厚を上述の如くの厚肉状にて一定とすること
により、結果として本体部１１Ａの略全域に略一定の硬
さすなわち比較的小なる可撓性を具備する。また、先端
部１２Ａにおける内管部１３Ａの肉厚を上述の如くの厚
肉状にて一定とし、かつ先端部１２Ａにおける外管部１
４Ａの肉厚を上述の如くの薄肉状にて一定とすることに
より、結果として先端部１２Ａの略全域に略一定の柔軟
さすなわち比較的大なる可撓性を具備する。In addition, in this catheter 30, the wall thickness of the inner tube portion 13A in the main body portion 11A is kept thin and constant as described above, and the wall thickness of the outer tube portion 14A in the main body portion 11A is kept constant as described above. As a result, the main body portion 11A has a substantially constant hardness, that is, relatively small flexibility, over substantially the entire area of the main body portion 11A. Further, the wall thickness of the inner tube portion 13A at the tip portion 12A is made constant in the thick shape as described above, and the outer tube portion 13A at the tip portion 12A is made constant.
By making the thickness of the tip portion 4A constant and thin as described above, as a result, the tip portion 12A has a substantially constant flexibility, that is, a relatively large flexibility over the substantially entire area.
【００２５】次に、本発明の作用について説明する。上
記各実施例に係るカテーテル１０、２０、３０は、例え
ばガイドワイヤ等に導かれて、血管等体腔内に挿入され
、その先端の方向を制御されつつ目的の部位に到達可能
とされ、治療や検査を行うことを可能とする。Next, the operation of the present invention will be explained. The catheters 10, 20, and 30 according to each of the above embodiments are guided by, for example, a guide wire, and inserted into a body cavity such as a blood vessel, and are able to reach a target site while controlling the direction of the distal end, so that they can be used for treatment or treatment. Enables inspection.
【００２６】ここで、上記各カテーテル１０、２０、３
０にあっては、前述のように、本体部１１、１１Ａの略
全域に略一定のある程度の硬さすなわち比較的小なる可
撓性を備え、先端部１２、１２Ａの略全域に略一定のあ
る程度の柔軟さすなわち比較的大なる可撓性を備えてい
る。したがって、上記各カテーテル１０、２０、３０が
例えば血管内に挿入され、押し進められる時、その先端
部１２、１２Ａはその略全域がガイドワイヤに容易に沿
って挿入容易となり、かつ血管壁を傷つけることがなく
、その本体部１１、１１Ａは押し進める力を先端部１２
、１２Ａにまで適確に伝えることを確実にする。[0026] Here, each of the above catheters 10, 20, 3
0, as described above, the main body parts 11, 11A have a certain degree of hardness that is substantially constant, that is, the flexibility is relatively small, and the tip parts 12, 12A have a substantially constant hardness, that is, relatively small flexibility, in the substantially entire area of the main body parts 11, 11A. It has a certain degree of flexibility or relatively large flexibility. Therefore, when each of the catheters 10, 20, 30 is inserted into a blood vessel and pushed forward, substantially the entire area of the distal end portions 12, 12A can easily be inserted along the guide wire, and the blood vessel wall will not be damaged. The body parts 11 and 11A transfer the pushing force to the tip part 12.
, 12A.
【００２７】さらに、上記各カテーテル１０、２０、３
０にあっては、前述のように、本体部１１、１１Ａと先
端部１２、１２Ａとの境界領域の内面および外面に段差
を生ずることがない。したがって、血管等への挿入を円
滑に行うことが可能となるとともに、血栓を生ずること
がない。また、本体部１１、１１Ａと先端部１２、１２
Ａとの間で離脱を生ずることもない。Furthermore, each of the above catheters 10, 20, 3
0, as described above, there is no difference in level between the inner and outer surfaces of the boundary area between the main body portions 11, 11A and the tip portions 12, 12A. Therefore, it is possible to smoothly insert the tube into a blood vessel, etc., and no thrombus is generated. In addition, the main body parts 11, 11A and the tip parts 12, 12
There will be no separation from A.
【００２８】[0028]
【発明の効果】以上のように、本発明は、可撓性が比較
的小なる管状本体部と、可撓性が比較的大なる管状先端
部とが軸方向に一体に成形されてなるカテーテルにおい
て、該カテーテルは該本体部と該先端部に連続する少な
くとも内管部と外管部とを有し、該本体部と該先端部と
で肉厚の異なる内管部の外面に、外管部を被覆成形して
なり、内管部と外管部の２つの管部のうち、先端部にお
ける肉厚が他方の管部に比して厚肉でありかつ本体部に
おける肉厚が他方の管部に比して薄肉である方の管部の
可撓性を他方の管部の可撓性に比してより大とし、該本
体部における内管部と外管部の肉厚をそれぞれ一定とし
、かつ該先端部における内管部と外管部の肉厚もそれぞ
れ一定とし、該本体部と該先端部とが両者間に段差を形
成することなく一体に成形されているようにしたもので
ある。As described above, the present invention provides a catheter in which a tubular body portion with relatively low flexibility and a tubular tip portion with relatively high flexibility are integrally molded in the axial direction. The catheter has at least an inner tube section and an outer tube section that are continuous with the main body section and the distal end section, and the outer tube is attached to the outer surface of the inner tube section with different wall thicknesses between the main body section and the distal end section. Of the two tube parts, the inner tube part and the outer tube part, the wall thickness at the tip part is thicker than the other tube part, and the wall thickness at the main body part is thicker than the other tube part. The flexibility of one tube section, which is thinner than the other tube section, is made greater than the flexibility of the other tube section, and the wall thicknesses of the inner tube section and the outer tube section of the main body section are set respectively. and the wall thickness of the inner tube part and the outer tube part at the tip part are also constant, so that the main body part and the tip part are integrally molded without forming a step between them. It is something.
【００２９】また、本発明は、本体部の曲げ弾性率が２
８００〜３２００ｋｇ／ｃｍ２であり、先端部の曲げ弾
性率が１０００〜１４００ｋｇ／ｃｍ２であるようにし
たものである。Further, in the present invention, the bending elastic modulus of the main body is 2.
800 to 3200 kg/cm2, and the bending elastic modulus of the tip part is 1000 to 1400 kg/cm2.
【００３０】また、本発明は、カテーテルの外径と内径
とが本体部と先端部にわたり、ともに均一であるように
したものである。Further, according to the present invention, the outer diameter and inner diameter of the catheter are uniform over both the main body portion and the distal end portion.
【００３１】また、本発明は、本体部と先端部とがその
内面及び外面に段差を生じることなく滑らかに連続して
なるようにしたものである。Further, according to the present invention, the main body portion and the distal end portion are smoothly continuous with each other without creating a step on the inner and outer surfaces thereof.
【００３２】また、本発明は、本体部と先端部との境界
部分における肉厚が滑らかに変化するものであるように
したものである。Further, according to the present invention, the wall thickness at the boundary between the main body portion and the tip portion changes smoothly.
【００３３】したがって、本発明によれば、本体部と先
端部とが、それぞれ、それらの略全域に略一定の硬さと
柔軟さとを有し、かつ両者間に段差を形成することなく
一体に成形されてなるカテーテルを得ることが可能とな
り、血管等への挿入を円滑に行うことが可能となるとと
もに、血栓を生ずることがなく、また本体部と先端部と
の間で離脱を生ずるおそれもない。さらに本体部の曲げ
弾性率を２８００〜３２００ｋｇ／ｃｍ２、好ましくは
３０００ｋｇ／ｃｍ２とすることにより、カテーテルを
血管内に挿入するときに押し進める力を先端部に適確に
伝えることができる。また、先端部の曲げ弾性率を１０
００〜１４００ｋｇ／ｃｍ２、好ましくは１２００ｋｇ
／ｃｍ２とすることにより、カテーテルを血管内に挿入
するときに血管壁を傷つけることなく挿入可能な可撓性
を与えることができる。なお、所望によりカテーテルの
外表面に生体適合性のある材料、例えばシリコーン樹脂
、シリコーン−ウレタン共重合体、セグメントポリウレ
タン等の層を設けることによりさらに生体適合性に優れ
たカテーテルを得ることができる。また、本体部と先端
部とがその境界部分における肉厚変化を滑らかな変化と
することにより可撓性の変化も滑らかとなり、血管内等
へのカテーテルの挿入が容易となる。Therefore, according to the present invention, the main body portion and the tip portion each have substantially constant hardness and flexibility over substantially the entire area thereof, and are integrally molded without forming a step between them. It is now possible to obtain a catheter that is made of a mixture of carbon dioxide, which can be smoothly inserted into a blood vessel, etc., and which does not cause thrombus formation, and there is no risk of dislodgement between the main body and the distal end. . Furthermore, by setting the bending elastic modulus of the main body to 2,800 to 3,200 kg/cm 2 , preferably 3,000 kg/cm 2 , the pushing force when inserting the catheter into a blood vessel can be accurately transmitted to the distal end. In addition, the bending elastic modulus of the tip was set to 10
00-1400kg/cm2, preferably 1200kg
/cm2, it is possible to provide flexibility that allows the catheter to be inserted into a blood vessel without damaging the blood vessel wall. If desired, a catheter with even better biocompatibility can be obtained by providing a layer of a biocompatible material such as silicone resin, silicone-urethane copolymer, segmented polyurethane, etc. on the outer surface of the catheter. Furthermore, since the wall thickness changes smoothly at the boundary between the main body and the distal end, the flexibility changes smoothly, making it easier to insert the catheter into a blood vessel or the like.
【図１】図１は一般のカテーテルを示す平面図である。FIG. 1 is a plan view showing a general catheter.
【図２】図２は本発明の第１実施例に係るカテーテルを
示す断面図である。FIG. 2 is a sectional view showing a catheter according to a first embodiment of the present invention.
【図３】図３は本発明の第２実施例に係るカテーテルを
示す断面図である。FIG. 3 is a sectional view showing a catheter according to a second embodiment of the present invention.
【図４】図４は本発明のさらに他の実施例に係るカテー
テルを示す断面図である。FIG. 4 is a sectional view showing a catheter according to still another embodiment of the present invention.
１０、２０、３０ カテーテル １１、１１Ａ 本体部 １２、１２Ａ 先端部 １３、１３Ａ 内管部 １４、１４Ａ 外管部 10, 20, 30 catheter 11, 11A Main body 12, 12A Tip 13, 13A Inner pipe part 14, 14A Outer tube part
Claims (5)
可撓性が比較的大なる管状先端部とが軸方向に一体に成
形されてなるカテーテルにおいて、該カテーテルは該本
体部と該先端部に連続する少なくとも内管部と外管部と
を有し、該本体部と該先端部とで肉厚の異なる内管部の
外面に、外管部を被覆成形してなり、内管部と外管部の
２つの管部のうち、先端部における肉厚が他方の管部に
比して厚肉でありかつ本体部における肉厚が他方の管部
に比して薄肉である方の管部の可撓性を他方の管部の可
撓性に比してより大とし、該本体部における内管部と外
管部の肉厚をそれぞれ一定とし、かつ該先端部における
内管部と外管部の肉厚もそれぞれ一定とし、該本体部と
該先端部とが両者間に段差を形成することなく一体に成
形されていることを特徴とするカテーテル。[Claim 1] A tubular main body portion having relatively low flexibility;
A catheter having a relatively flexible tubular distal end portion integrally molded in the axial direction, the catheter having at least an inner tube portion and an outer tube portion continuous with the main body portion and the distal end portion. , an outer tube part is coated and molded on the outer surface of an inner tube part whose wall thickness is different between the main body part and the tip part, and the wall thickness at the tip part of the two tube parts, the inner tube part and the outer tube part, is The flexibility of one tube section that is thicker than the other tube section and thinner than the other tube section in the main body section is equal to the flexibility of the other tube section. The thickness of the inner tube portion and the outer tube portion of the main body portion are constant, and the thickness of the inner tube portion and the outer tube portion of the tip portion are also constant, and the thickness of the inner tube portion and the outer tube portion of the main body portion are constant. A catheter characterized in that the distal end portion and the distal end portion are integrally molded without forming a step between the two.
００ｋｇ／ｃｍ２であり、先端部の曲げ弾性率が１００
０〜１４００ｋｇ／ｃｍ２である特許請求の範囲第１項
記載のカテーテル。[Claim 2] The bending elastic modulus of the main body is 2800 to 32.
00 kg/cm2, and the bending elastic modulus of the tip is 100
The catheter according to claim 1, which has a weight of 0 to 1400 kg/cm2.
先端部にわたり、ともに均一である特許請求の範囲第１
項又は第２項記載のカテーテル。Claim 3: The outer diameter and inner diameter of the catheter are both uniform over the main body portion and the distal end portion.
The catheter according to item 1 or 2.
に段差を生じることなく滑らかに連続してなる特許請求
の範囲第１項〜第３項のいずれかに記載のカテーテル。4. The catheter according to claim 1, wherein the main body portion and the distal end portion are smoothly continuous with each other without forming a step on the inner and outer surfaces thereof.
肉厚が滑らかに変化するものである特許請求の範囲第１
項〜第４項のいずれかに記載のカテーテル。[Claim 5] Claim 1, wherein the wall thickness at the boundary portion between the main body portion and the tip portion changes smoothly.
The catheter according to any one of Items 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3149256A JPH04261666A (en) | 1991-05-27 | 1991-05-27 | Catheter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3149256A JPH04261666A (en) | 1991-05-27 | 1991-05-27 | Catheter |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58140608A Division JPS6031765A (en) | 1983-08-02 | 1983-08-02 | Catheter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04261666A true JPH04261666A (en) | 1992-09-17 |
| JPH0530469B2 JPH0530469B2 (en) | 1993-05-10 |
Family
ID=15471286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3149256A Granted JPH04261666A (en) | 1991-05-27 | 1991-05-27 | Catheter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04261666A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0928808A (en) * | 1995-07-18 | 1997-02-04 | Nippon Zeon Co Ltd | Double tube and balloon catheter using same |
| JPH09505924A (en) * | 1993-12-04 | 1997-06-10 | ヒューレット・パッカード・カンパニー | Playback of data recorded at different bit densities |
| JP2004154195A (en) * | 2002-11-01 | 2004-06-03 | Kanegafuchi Chem Ind Co Ltd | Catheter |
| US20100198007A1 (en) * | 2003-09-15 | 2010-08-05 | Benny Greenburg | System Of Accessories For Use With Bronchoscopes |
| US10952593B2 (en) | 2014-06-10 | 2021-03-23 | Covidien Lp | Bronchoscope adapter |
-
1991
- 1991-05-27 JP JP3149256A patent/JPH04261666A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09505924A (en) * | 1993-12-04 | 1997-06-10 | ヒューレット・パッカード・カンパニー | Playback of data recorded at different bit densities |
| JPH0928808A (en) * | 1995-07-18 | 1997-02-04 | Nippon Zeon Co Ltd | Double tube and balloon catheter using same |
| JP2004154195A (en) * | 2002-11-01 | 2004-06-03 | Kanegafuchi Chem Ind Co Ltd | Catheter |
| JP4501337B2 (en) * | 2002-11-01 | 2010-07-14 | 株式会社カネカ | catheter |
| US20100198007A1 (en) * | 2003-09-15 | 2010-08-05 | Benny Greenburg | System Of Accessories For Use With Bronchoscopes |
| US10952593B2 (en) | 2014-06-10 | 2021-03-23 | Covidien Lp | Bronchoscope adapter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0530469B2 (en) | 1993-05-10 |
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|---|---|---|---|
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