Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1990-02-26
1994-04-19
Weiss, John G.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604164, 604280, 128772, A61M 2500, A61M 5178
Patent
active
053041402
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a catheter for introduction into a blood vessel for the treatment or inspection of a diseased portion within the blood vessel.
BACKGROUND ART
A catheter for introduction into a blood vessel is used mainly for injection of a medical solution, a contrast media, etc. into the blood vessel for the treatment or inspection of a diseased portion within the blood vessel. The conventional catheter of this type is constructed such that a hub is simply mounted to the proximal end of a flexible tubular body. For introducing the conventional catheter into a blood vessel, a guide wire is inserted in advance into the blood vessel, followed by introducing the catheter into a desired position within the blood vessel along the guide wire.
The requirement of guiding by a guide wire necessitates a troublesome operation for a long time for enabling the distal end of the conventional catheter to reach a desired position. Also, a blood vessel after branching is bent and diminished in inner diameter, leading to an increased resistance to the catheter insertion. Naturally, it is difficult to insert a guide wire into the branched blood vessel, making it more difficult to introduce the catheter to reach the desired position. Further, a series of operations for insertion and withdrawal of the catheter give serious pains to the patient.
An object of the present invention is to provide a catheter for introduction into a blood vessel, which can be easily introduced even into a branched blood vessel such as a celiac artery without using a guide wire. The catheter of the present invention permits markedly alleviating the pain given to the patient. Also, it is possible to simplify the operation for introducing the catheter into a blood vessel.
DISCLOSURE OF THE INVENTION
In the present invention, the above-noted problems inherent in the prior art are solved by disposing a super-elastic wire within a tube or a tubular material forming a catheter body such that the wire extends in the longitudinal direction of the tube.
According to the present invention, there is provided a catheter for introduction into a blood vessel, comprising a catheter body and a super-elastic wire housed in the catheter body in a manner to extend along the catheter body.
Where the super-elastic wire is disposed within a lumen of the catheter body, the wire may be coated with a synthetic resin and, further, with a water-soluble high molecular weight material. The outer surface of the catheter body may also be coated with a water-soluble high molecular weight material so as to reduce the resistance by friction with the inner wall of the blood vessel. It is also possible to mix an X-ray intransmissible material with the resin used for coating the catheter body or super-elastic wire. In this case, the catheter introducing operation can be performed while observing the image of the catheter formed by the X-ray. Further, the super-elastic wire may be detachably mounted to the catheter body.
Further, the super-elastic wire may be embedded in a part of the catheter body, or may be detachably mounted within a lumen of the catheter body. Still further, it is desirable to bend in advance the distal end portion of the super-elastic wire to conform with the shape of that portion of the blood vessel at which said distal end portion is to be positioned.
The super-elastic wire used in the present invention is formed of an alloy which exhibits an apparent plastic deformation of several % to about 10%, if load is applied to the alloy under temperatures higher than the temperature at which the reverse transformation of the alloy is completed, and which is completely brought back to the original state upon removal of the load. It is most desirable to use a Ti-Ni alloy consisting essentially of 50.5 to 51.0 atomic % of Ni and the balance substantially Ti for forming the super-elastic wire. It is also possible to use a Ti-Ni alloy consisting essentially of 50.3 to 51.0 atomic % of Ni and the balance substantially Ti. Further, it is p
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Ishihara Kazuhito
Kugo Takahiro
Terumo Kabushiki Kaisha
Weiss John G.
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