Surgery – Instruments – Internal pressure applicator
Patent
1995-10-30
1998-06-30
Buiz, Michael
Surgery
Instruments
Internal pressure applicator
606194, 606198, A61M 2900
Patent
active
057726817
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a dilation catheter comprising a sealed distal end section, an open proximal end section and an elongated middle section, one part of said section being an elongated flexible balloon section expanding when supplied with pressure fluid through the proximal end section, said balloon section assuming a form of predominantly constant cross-section, said middle section comprising an inner elastic tube, a reinforcement net made of metallic monofilaments surrounding the inner tube and an outer elastic tube surrounding the reinforcement net, the parts of said middle section being situated outside the balloon section being predominantly unexpandable or expandable to a lesser degree than the balloon section, said reinforcement net is made of metallic monofilaments crossing each other and being helically wound around the longitudinal axis of the middle section, the helices being inside each other or braided, and said reinforcement net abuts on the outer surface of the inner tube and the inner surface of the outer tube at least in the area of the balloon section when the balloon section is expanded.
The invention also relates to a dilation catheter comprising a sealed distal end section, an open proximal end section and an elongated middle section, one part of said middle section being an elongated flexible balloon section expanding when supplied with pressure fluid through the proximal end section, said balloon section assuming a form of predominantly constant cross-section, said middle section comprising an inner elastic tube, a reinforcement net made of metallic monofilaments surrounding the inner tube and an outer elastic tube surrounding the reinforcement net, the parts of said middle section situated outside the balloon section being predominantly unexpandable or expandable to a lesser degree than the balloon section, said reinforcement net is a knitted net of metallic monofilaments, the mesh rows of said net extending helically around the longitudinal axis of the middle section, and said reinforcement net abuts on the outer surface of the inner tube and the inner surface of the outer tube at least in the area of the balloon section when the balloon section is expanded.
BACKGROUND ART
Radiologists, cardiologists and urologists have always preferred to perform dilation operations using systems assuming non-linear configurations when inflated. In the mid-sixties two well-known physicians, Judkins and Dottier, were the first to introduce a system for dilation of blood vessels using a coaxial double catheter system. This old technique was later modified by a famous physician who lent his name to the well-known Gruentzig balloon catheter to be used for coronary angioplasty, also known as PTCA (percutaneous transluminal coronary angioplasty). The various embodiments of balloon dilation catheters can be divided into two main classes. Balloons of one main class are normally not reinforced, i.e. not laminated. The balloon is sealed to an outer shaft having two lumens, one of which is used to inflate the balloon, the other as a guide-wire. Balloons of the second main class are coaxial constructions, i.e. they function according to a telescopic principle whereby fluid migrates between to layers directly connected to the balloon at the distal end.
The best known patent specification relating to a balloon dilation catheter of the first main class is U.S. Pat. No. 4,195,637 disclosing a balloon assuming a straight cylindrical configuration when expanded under pressure. This best known and probably most widely used system for dilation of blood vessels is not particularly flexible.
A second, less widely used dilation technique, as mentioned above, makes use of a coaxial system, having the detrimental effect that inflation of the balloon causes displacement of the catheter in the blood vessel. Also in this case a straight, cylindrical, inflexible balloon is formed, cf. U.S. Pat. No. 4,706,607 and DK-B154,870. A variation of a reinforced laminate structure for a balloon is disc
REFERENCES:
patent: 5328469 (1994-07-01), Coletti
patent: 5360443 (1994-11-01), Barone et al.
Buiz Michael
Godlewski Richard J.
Metra ApS
Truong Kevin
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