Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1997-06-10
1998-11-10
McDermott, Corrine M.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 96, A61M 2500
Patent
active
058336729
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
The present invention relates to a double tube, an apparatus for producing the double tube, a balloon catheter produced by using the double tube, and a process for producing the balloon catheter, and in more detail relates to a suitable double tube to easily produce a balloon catheter having a high rigidity, a suitable apparatus for producing the double tube, a balloon catheter produced by using the double tube, and a process for producing the balloon catheter.
BACKGROUND OF ART
An intra-aortic balloon pumping (what is called IABP) balloon catheter or a percutaneous transluminal coronary angioplasty (what is called PTCA) balloon catheter are comprised of a medical double tube having an outer tube and an inner tube which is provided within the outer tube. Also, in order to make it easy to insert the catheter into a body by saving the space to fold and accommodate a balloon film, the outer tube is comprised shorter than the inner tube at the distal end of the double tube. Further, the balloon film, which is fixed with the distal end of the outer tube and the distal end of the inner tube, is comprised to enable to be folded by wrapping around the inner tube.
In these medical double tubes for using the balloon catheter, the inner tube moves freely within a lumen of the outer tube, so is easily twisted, thereby making a high resistance of a fluid which flows in the lumen of the outer tube. Therefore, the response property of expanding and contracting movement of the balloon becomes lower. Also, in order to spread the area of cross section of the lumen, it is necessary to reduce the wall thickness of the tube, but in this case, the rigidity of the tube as a whole is reduced or easily kinked, thereby making such a problem as it becomes hard to insert into a vascular.
The inner tube of the balloon catheter is made to enable a guidewire to pass. The guidewire is passed through the narrow vascular cavity, the inner tube of a prior balloon catheter is passed through this guidewire, and thereby the balloon catheter is inserted into the vascular cavity. At that time, since the inner tube moves freely in the lumen of the outer tube, the guidewire becomes easily buckling or meandering, thereby making another problem that the resistance becomes higher when the guidewire is pushed into.
Further, the outer tube and the inner tube of the medical double tube used for the balloon catheter, being formed with a homogeneous material from the distal end to the proximal end, bends easily almost the same way in the range from the distal end to the proximal end. The inner tube of the balloon catheter is smaller than the outer tube in the outer diameter, so bends more easily than the outer tube. The distal end portion of the balloon catheter, which is held by only the inner tube extended from the distal end of the outer tube to the distal direction, is comprised more easier to bend in comparison with the proximal end held by the inner tube and the outer tube.
In this way, the inner tube extended from the distal end of the outer tube to the distal direction causes a kink easily around the distal end of the outer tube. Further, the distal end of the outer tube sometimes makes a trouble in respect of the insertion of the balloon catheter by colliding with the vascular cavity.
As a medical double tube, there are suggested such a balloon catheter that the outer diameter is smaller in the distal end portion than in the proximal end portion of the outer tube. There are also suggested such a balloon catheter obtained by forming the distal end portion by a soft material and the proximal end portion by a stiff material and tying both the ends up. In these balloon catheters, the insertion into the vascular cavity has been improved, the reinforcement, however, is not sufficient in the portion where the outer diameter is altered (the step portion) or the portion where the ends are tied up, so a kink is easily caused.
As a medical double tube, there are suggested such a medical double tube that a part of an outer surface of the inn
REFERENCES:
patent: 3430631 (1969-03-01), Abramsom
patent: 4909787 (1990-03-01), Danforth
patent: 5085649 (1992-02-01), Flynn
patent: 5100379 (1992-03-01), Wendell
patent: 5195962 (1993-03-01), Martin et al.
patent: 5222949 (1993-06-01), Kaldany
patent: 5456674 (1995-10-01), Bos et al.
patent: 5593394 (1997-01-01), Kanesaka et al.
Kawata Keiichi
Sakai Kouichi
Toyokawa Tetsuo
Uchiyama Masaru
Urata Hidenobu
McDermott Corrine M.
Nippon Zeon Co. Ltd.
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