Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1989-10-26
1990-10-23
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604102, A61M 2500
Patent
active
049648535
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a catheter equipped with an expansible member for use in curing a stricture portion inside a blood vessel. Specifically, this invention relates to a catheter equipped with an expansible member for expanding a stricture portion inside a blood vessel to improve the blood flow on the peripheral side of the stricture portion.
2. Background Art
Heretofore, as a catheter equipped with an expansible member for expanding a stricture portion of a blood vessel, there has been so-called Gruentich type disclosed, for example, in U.S. Pat. No. 4,195,637. Further, there has been used so-called Simpson-Robert type disclosed, for example, in U.S. Pat. No. 4,323,071.
Previously, adaptible cases of vasodilatation were limited to cases of locallized stricture near coronary artery from an anatomical viewpoint, which were lesions of about 15 to 20 mm length, monobranched lesions, non-calcified lesions, etc. In order to extend more the range of adaptible cases, as the above type catheter, a catheter equipped with an expansible member of low-profile shape having the same structure but narrowed only at the tip has been considered in addition to those of standard structure to be adaptible to strictures in more peripheral blood vessel or severer strictures (sub-complete clogging).
A catheter called Gruentich type as described above comprises a catheter tube having two lumens and an expansible member attached near the tip of the catheter tube. One of the lumens is open at the tip of the catheter to form a channel for a guide wire and for tip pressure measurement. The other of the lumens is in communication with the inside of the expansible member at the base end of the expansible member to form a flow channel for injecting fluid for expansion such as vasographic contrast liquid under pressure to expand the expansible member. In this catheter, it is difficult to remove bubbles remaining within the expansible member when expanded by injecting vasographic contrast liquid or the like into the expansible member. If bubbles remain, X-ray image may become unclear and the remaining bubbles may enter the human body in the case that the expansible member is damaged from some cause.
A catheter called Simpson-Robert type has a coaxial double-wall structure comprising an inner tube forming a first lumen whose tip is open, and an outer tube into which the inner tube is inserted and to the tip of which an expansible member is attached. A second lumen is formed between the inner surface of the outer tube and the outer surface of the inner tube. An ultrafine metal pipe is disposed in the second lumen for removing bubbles. Although bubbles do not remain in the catheter of this type unlike those called Gruentich type as described above, because the metal pipe is used, the catheter of this type has little followabilty to the shape and movement of a blood vessel which is intensely curved. Further, the metal pipe inserted may injure or damage the inner wall of the catheter or expansible member.
Accordingly, an object of the present invention is to provide a catheter equipped with an expansible member in which it is easy to remove bubbles from the inside of the expansible member and there is no worry of damaging the catheter or expansible member.
DISCLOSURE OF THE INVENTION
A catheter equipped with an expansible member according to the present invention comprises an inner tube having a first lumen whose tip is open and a second lumen extending to the tip direction of the first lumen; an outer tube disposed coaxially with the inner tube and having a tip at a position recessed by a predetermined distance from the tip of the inner tube and forming a third lumen between it and the outer surface of the inner tube; a contractible or foldable expansible member having a tip end portion and a base end portion, the base end portion being fitted to the outer tube and the tip end portion being fitted to the inner tube, the expansible member communicating with the second lumen near the tip end portion and wi
REFERENCES:
patent: 4195637 (1980-04-01), Gruntzig et al.
patent: 4323071 (1982-04-01), Simpson et al.
patent: 4411055 (1983-10-01), Simpson et al.
patent: 4597755 (1986-07-01), Samson et al.
patent: 4752286 (1988-06-01), Okada
patent: 4762129 (1988-08-01), Bonzel
patent: 4892099 (1990-01-01), Ohkawa et al.
Sagae Kyuta
Sugiyama Yoshiaki
Terumo Kabushiki Kaisha
Yasko John D.
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