JPH0230265B2 - - Google Patents
Info
- Publication number
- JPH0230265B2 JPH0230265B2 JP58140608A JP14060883A JPH0230265B2 JP H0230265 B2 JPH0230265 B2 JP H0230265B2 JP 58140608 A JP58140608 A JP 58140608A JP 14060883 A JP14060883 A JP 14060883A JP H0230265 B2 JPH0230265 B2 JP H0230265B2
- Authority
- JP
- Japan
- Prior art keywords
- main body
- catheter
- tip
- section
- flexibility
- 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.)
- Expired - Lifetime
Links
- 238000005452 bending Methods 0.000 claims description 10
- 210000004204 blood vessel Anatomy 0.000 description 16
- 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 4
- 230000000694 effects Effects 0.000 description 3
- 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 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
- Materials For Medical Uses (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Description
【発明の詳細な説明】
発明の背景
技術分野
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.
従来技術
第１図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。Prior 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 for treatment or examination. It is possible to do this.
そこで、このカテーテル１にあつては、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、血管内に挿入され押し進め
られるものであることから、その先端部３は血管
壁を傷つけることのないように比較的大なる可撓
性を備えなければならず、その本体部２は押し進
める力を先端部３に適確に伝えるべく比較的小な
る可撓性を備えなければならない。 Therefore, in this catheter 1, the main body 2 is required to have a certain degree of hardness, that is, relatively small flexibility, and the distal end 3
It is necessary to have a certain degree of flexibility, that is, a relatively large amount of flexibility. In particular, in the case of a catheter 1 for a vascular system, since it is inserted into a blood vessel and pushed forward, its tip 3 must have relatively high flexibility so as not to damage the blood vessel wall. The body portion 2 must have relatively little flexibility in order to properly transmit the pushing force to the tip portion 3.
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つ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にあつては、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。 Conventionally, as a catheter 1 consisting of a main body part 2 having relatively low flexibility and a distal end part 3 having relatively high flexibility, the main body part 2 and the distal end part 3 have been bonded together using an adhesive or a melting agent. A catheter 1 has been proposed which is connected by a cap 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. It is difficult and may cause blood clots. In addition, due to a poor connection between the main body portion 2 and the tip portion 3, there is a risk of disconnection or the like due to separation between the two.
発明の目的
本発明は、可撓性が比較的小なる本体部と、可
撓性が比較的大なる先端部とが、確実に両者間に
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。 Purpose of the Invention The present invention provides a catheter in which a main body portion having relatively low flexibility and a distal end portion having relatively high flexibility are integrally molded without forming a step between the two. The purpose is to provide
発明の構成
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。 Structure of the Invention In order to achieve the above object, the present invention has a tubular main body portion with relatively low flexibility and a tubular tip portion with relatively high flexibility that are integrally molded in the axial direction. The catheter has at least an inner tube section and an outer tube section continuous with the main body section and the distal end section, and the outer surface of the inner tube section has different wall thicknesses between the main body section and the distal end section. The tube portion is covered and molded, and of the two tube portions, the inner tube portion and the outer tube portion, the wall thickness at the tip portion is thicker than the other tube portion, and the wall thickness at the main body portion is thicker than the other tube portion. 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 main body section and the tip section form a step between them. It is designed so that it is molded in one piece without any additional parts.
また、本発明は、本体部の曲げ弾性率が2800〜
3200Kg／cm2であり、先端部曲げ弾性率が1000〜
1400Kg／cm2であるようにしたものである。 In addition, the present invention has a bending elastic modulus of the main body of 2800 to 2800.
3200Kg/ cm2 , and the bending modulus of the tip is 1000~
The weight was set at 1400Kg/cm 2 .
また、本発明は、カテーテルの外径と内径が本
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.
また、本発明は、本体部と先端部とがその内面
およ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 without forming a step on the inner and outer surfaces thereof.
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ようにしたもの
である。 Further, in the present invention, the wall thickness at the boundary between the main body and the tip changes smoothly.
発明の具体的説明
第２図は本発明の第１実施例に係るカテーテル
１０を示す断面図である。 DETAILED DESCRIPTION OF THE INVENTION FIG. 2 is a sectional view showing a catheter 10 according to a first embodiment of the present invention.
カテーテル１０は、第２図に示すように、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１
２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、第２図に示すように階
段状でなく、テーパ状の滑らかな変化とされてい
る。 The catheter 10 has a length as shown in FIG.
The main body part 11 with length L 1 and the tip part 12 with length L 2 are integrally molded in the axial direction.
An outer tube section 14 is molded to cover the upper surface of an inner tube section 13 having different wall thicknesses. Here, the inner tube part 13
has a substantially constant inner diameter, with a thick wall at the main body portion 11 and a thin wall thickness at the distal end portion 12. 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 wall thickness change of the outer tube part 14 at the boundary between the main body part 11 and the tip part 12 is not a step-like change as shown in FIG. 2, but a smooth taper-like change.
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
〜1400Kg／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によつて形
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１
４によつて形成され、全体としてその可撓性を比
較的大とされている。 Here, the wall thickness of the inner tube portion 13 is equal to that of the main body portion 11.
Since the outer tube part 14 has a thicker wall, its flexibility is smaller than that of the outer tube part 14, for example, a flexural modulus of elasticity of 2800 to 3200 Kg/cm 2 , preferably 3000 Kg/cm 2 It is made of polyamide elastomer. On the other hand, the outer tube portion 14 has relatively high flexibility, for example, a bending elastic modulus of 1000.
-1400 Kg/cm 2 , preferably 1200 Kg/cm 2 of polyamide elastomer. That is,
The main body portion 11 of the catheter 10 has a thick walled component formed by a 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 portion formed into a relatively flexible outer tube portion 1.
4, and has relatively high flexibility as a whole.
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第２図に示すよ
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つており、血管内等
への挿入を円滑に行うことができる。 In addition, in the catheter 10, the main body part 11 and the distal end part 12 of each inner tube part 13 and outer tube part 14 are
Since the wall thickness changes smoothly in the boundary region between the catheter 10 and the catheter 10 as shown in FIG. Therefore, it can be smoothly inserted into a blood vessel or the like.
しかして、このカテーテル１０にあつては、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。 Thus, this catheter 10 is used after a catheter hub is connected to the end of the main body 11 and the distal end 12 is given a necessary bent shape.
すなわち、上記第１実施例によれば、可撓性が
比較的小なる本体部１１と可撓性が比較的大なる
先端部１２とが一体成形されてなるカテーテル１
０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１３によつて形成され、それらの外径は外管部
１４によつて形成され、したがつて、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１２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 1 is formed by integrally molding the main body portion 11 with relatively low flexibility and the distal end portion 12 with relatively high flexibility.
It becomes possible to obtain 0. Here, the inner diameters of the main body part 11 and the distal end part 12 of the catheter 10 are formed by the inner tube part 13, and the outer diameters thereof are formed by the outer tube part 14, so that the main body part 11
There is no difference in level between the inner and outer surfaces of the boundary area between the main body 11 and the distal end 12, allowing smooth insertion into a blood vessel, etc., and no thrombus formation. There is no risk of a separation between the two countries.
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3000Kg／cm2のポリアミドエラストマー
で本体部１１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１
３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１４を被覆する。例えば、曲げ弾性率1200
Kg／cm2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 described. First, the thickness of the main body part 11 is the same as that of the tip part 12.
The inner tube portion 13 is made by extrusion molding or the like, and has a relatively small flexibility. for example,
An inner tube part 1 made of polyamide elastomer with a bending modulus of elasticity of 3000 Kg/ cm2 , with a main body part 11 having an inner diameter of 1.4 mm and an outer diameter of 2.1 mm, and a tip part 12 having an inner diameter of 1.4 mm and an outer diameter of 1.6 mm.
form 3. Next, on the upper surface of the inner tube part 13,
The outer tube part 14, which has relatively greater flexibility than the inner tube part 13, is covered. For example, flexural modulus 1200
The outer tube portion 14 with an outer diameter of 2.3 mm is coated with a polyamide elastomer of Kg/cm 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.
第３図は本発明の第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.
このカテーテル２０が前記カテーテル２０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を例えばピツチ１mmで編んだ点のみにあ
る。 This catheter 20 differs from the catheter 20 described above only in that a wire layer 21 made of stainless steel wire with a wire diameter of 0.08 mm is woven at a pitch of 1 mm, for example, between the inner tube portion 13 and the outer tube portion 14. be.
したがつて、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
よつて先端部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 this second embodiment, the main body part 11 and the distal end part 12 similar to the catheter 10 can be integrally molded reliably and without forming a step between them, and the main body part 11 It becomes possible to obtain a catheter 20 that has a large torsional rigidity and can more accurately orient the distal end portion 12 by twisting the main body portion 11.
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つては、第４図に示すカテ
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
するものであつてもよい。 In each of the above embodiments, the wall thickness of the inner tube section 13 is made thicker than that of the main body section 11, and the flexibility of the inner tube section 13 is made smaller than the flexibility of the outer tube section 14. We have explained the case where However, in the catheter according to the present invention, as in the catheter 30 shown in FIG. 4, the wall thickness of the inner tube portion 13A is made thinner at the main body portion 11A and thicker at the distal end portion 12A, The flexibility of the inner tube portion 13A may be greater than the flexibility of the outer tube portion 14A.
発明の具体的作用
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
えばガイデ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、治療や検査を行なうこと
を可能とする。 Specific Effects of the Invention Next, the effects of the present invention will be explained. The catheters 10, 20, and 30 according to each of the above embodiments are guided, for example, by a guide wire, and inserted into a body cavity such as a blood vessel, and the direction of the tip thereof is controlled so that it can reach a target site for treatment or examination. It is possible to do this.
ここで、上記各カテーテル１０，２０，３０に
あつては、前述のように、本体部１１，１１Ａに
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ている。したがつ
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に適確に伝えることを可能とする。 Here, in the case of each of the catheters 10, 20, 30, as described above, the main body portions 11, 11A have a certain degree of hardness, that is, relatively small flexibility, and the tip portions 12, 12A have a certain degree of flexibility. It has softness or relatively great flexibility. Therefore, when each of the catheters 10, 20, 30 is inserted into a blood vessel and pushed forward, the tip portions 12, 12A do not damage the blood vessel wall.
The main body portions 11, 11A make it possible to accurately transmit the pushing force to the tip portions 12, 12A.
さらに、上記各カテーテル１０，２０，３０に
あつては、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。したがつて、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１
１，１１Ａと先端部１２，１２Ａとの間で離脱を
生ずることもない。 Furthermore, in each of the catheters 10, 20, 30, 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 distal end portions 12, 12A. Therefore, it is possible to smoothly insert it into a blood vessel, etc., and no thrombus is generated. In addition, the main body 1
Separation does not occur between the tip portions 1, 11A and the tip portions 12, 12A.
発明の具体的効果
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、外管部に被覆成形してなり、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。 Specific Effects of the Invention As described above, the present invention provides a catheter in which a tubular main body portion having relatively low flexibility and a tubular tip portion having 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 of the tube sections, which is thinner than the other tube section, is made greater than the flexibility of the other tube section,
The main body portion and the tip portion are integrally molded without forming a step between them.
また、本発明は、本体部の曲げ弾性率が2800〜
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。 In addition, the present invention has a bending elastic modulus of the main body of 2800 to 2800.
3200Kg/ cm2 , and the bending modulus of the tip is 1000~
The weight was set at 1400Kg/cm 2 .
また、本発明は、カテーテルの外径と内径が本
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.
また、本発明は、本体部と先端部とがその内面
およ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 without forming a step on the inner and outer surfaces thereof.
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ようにしたもの
である。 Further, in the present invention, the wall thickness at the boundary between the main body and the tip changes smoothly.
したがつて、本発明によれば、本体部と先端部
とが確実にかつ両者間に段差を形成することなく
一体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1000〜1400Kg／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。尚、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, it is possible to obtain a catheter in which the main body portion and the distal end portion are reliably integrally molded without forming a step between the two, and the catheter can be smoothly inserted into a blood vessel, etc. In addition, there is no risk of blood clots being formed and separation occurring between the main body and the distal end. Furthermore, the bending elastic modulus of the main body was increased to 2800 to 3200 kg/
cm 2 , preferably 3000 Kg/cm 2 , it is possible to accurately transmit the pushing force to the tip when inserting the catheter into the blood vessel. In addition, by setting the bending elastic modulus of the tip to 1000 to 1400 Kg/cm 2 , preferably 1200 Kg/cm 2 , the catheter has the flexibility to be inserted into the blood vessel without damaging the blood vessel wall. be able to. 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.
第１図は一般のカテーテルを示す平面図、第２
図は本発明の第１実施例に係るカテーテルを示す
断面図、第３図は本発明の第２実施例に係るカテ
ーテルを示す断面図、第４図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。
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。
Figure 1 is a plan view showing a general catheter, Figure 2 is a plan view showing a general catheter;
The figure is a sectional view showing a catheter according to a first embodiment of the present invention, FIG. 3 is a sectional view showing a catheter according to a second embodiment of the present invention, and FIG. 4 is a sectional view showing a catheter according to a second embodiment of the present invention. FIG. 3 is a cross-sectional view of the catheter. 10, 20, 30...catheter, 11, 11A
...Body part, 12, 12A...Tip part, 13, 13A
...Inner pipe part, 14,14A...Outer pipe part.
Claims (1)
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。 ２ 本体部の曲げ弾性率が2800〜3200Kg／cm2であ
り、先端部の曲げ弾性率が1000〜1400Kg／cm2であ
る特許請求の範囲第１項記載のカテーテル。 ３ カテーテルの外径と内径とが本体部と先端部
にわたり、ともに均一である特許請求の範囲第１
項又は第２項記載のカテーテル。 ４ 本体部と先端部とがその内面および外面に段
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項ないし第３項のいずれかに記載の
カテーテル。 ５ 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特許請求の範囲第１
項ないし第４項のいずれかに記載のカテーテル。[Scope of Claims] 1. 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. It has at least an inner tube section and an outer tube section that are continuous with the main body section and the tip section, and the outer tube section is molded to cover the outer surface of the inner tube section, the wall thickness of which differs between the main body section and the tip 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 thinner than the other tube part. The flexibility of one tube portion is greater than the flexibility of the other tube portion, and the main body portion and the tip portion are integrally molded without forming a step between them. A catheter characterized by: 2. The catheter according to claim 1, wherein the main body portion has a bending elastic modulus of 2800 to 3200 Kg/cm 2 and the tip portion has a bending elastic modulus of 1000 to 1400 Kg/cm 2 . 3. Claim 1, wherein the outer diameter and inner diameter of the catheter are both uniform over the main body and the distal end.
The catheter according to item 1 or 2. 4. The catheter according to any one of claims 1 to 3, wherein the main body portion and the distal end portion are smoothly continuous without forming a step on the inner and outer surfaces thereof. 5. Claim 1, in which the wall thickness at the boundary between the main body and the tip changes smoothly.
The catheter according to any one of Items 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58140608A JPS6031765A (en) | 1983-08-02 | 1983-08-02 | Catheter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58140608A JPS6031765A (en) | 1983-08-02 | 1983-08-02 | Catheter |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3149256A Division JPH04261666A (en) | 1991-05-27 | 1991-05-27 | Catheter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6031765A JPS6031765A (en) | 1985-02-18 |
| JPH0230265B2 true JPH0230265B2 (en) | 1990-07-05 |
Family
ID=15272660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58140608A Granted JPS6031765A (en) | 1983-08-02 | 1983-08-02 | Catheter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6031765A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4739768B2 (en) * | 1986-06-02 | 1995-10-24 | Target Therapeutics Inc | Catheter for guide-wire tracking |
| JPH0352530Y2 (en) * | 1986-11-29 | 1991-11-14 | ||
| JPH03286328A (en) * | 1990-04-03 | 1991-12-17 | Canon Inc | Information processor |
| JP3691236B2 (en) | 1998-01-23 | 2005-09-07 | 朝日インテック株式会社 | catheter |
| KR20110139698A (en) * | 2009-03-09 | 2011-12-29 | 스미토모 베이클리트 컴퍼니 리미티드 | Catheter and Method of Making Catheter |
| JP2013192858A (en) * | 2012-03-22 | 2013-09-30 | Sumitomo Bakelite Co Ltd | Method of manufacturing catheter |
-
1983
- 1983-08-02 JP JP58140608A patent/JPS6031765A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6031765A (en) | 1985-02-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |