EP0457456A1
Expired / Lapsed
EP
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Multiple layer high strength balloon for dilatation catheter
Assignee: Medtronic Vascular Inc
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Filing: 1991-04-30
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Granted: —
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Expires: 2011-04-30
Abstract
Abstract A balloon for a dilatation catheter is formed to define relatively thin cone (C) and neck (N) segments at the opposite ends of the balloon (16) by forming the balloon in a plurality of separate very thin layers (18,20,22). The balloon is built up from a plurality of layers including an inner layer (22) which defines a complete balloon having a cylindrical midportion (22M), cones (22C) at its ends and necks (22N) at the ends of the cones. Each successive outer layer is trimmed to be shorter than the next adjacent innermost layer, the trimming being effected in the region of the cones. The composite balloon thus formed has a staggered wall thickness in the region of the cones as to define a cone that is approximately uniform in wall thickness in a direction extending toward the neck region. The resulting balloon will be better adapted to collapse to a low profile about the catheter shaft on which it is mounted.
Inventors
- 👤 Mark A. Saab
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 03:48
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/10; A61M25/1027; A61M25/1029; A61L; A61L29/00; A61L29/04; A61L29/06; A61M2025/1043; A61M2025/1075; A61M2025/1084
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
76 words
In a balloon for a dilatation catheter, the balloon being formed from polymeric material and having a cylindrical midportion, an outwardly tapering conical portion at each end of the midportion and a cylindrical neck portion at the ends of the conical portions, the improvement comprising the balloon being formed in at least two layers including an inner and outer layer, one of which is shortened and terminates in the region of the cones of the other.
Claim 2
Dependent Claim
44 words
A balloon as defined in claim 1 wherein there are at least three layers with at least one layer being disposed between the inside layer and the outside layer, the intermediate layer being of a length between that of the inside and outside layers.
Claim 3
Dependent Claim
20 words
A balloon as defined in claims 1 or 2 wherein the layers are in intimate adhesive-free contact with each other.
Claim 4
Dependent Claim
25 words
A balloon as defined in claims 1 or 2 wherein the more inwardly disposed layers are of greater length than the more outwardly disposed layers.
Claim 5
Dependent Claim
95 words
A balloon dilatation catheter comprising an elongate flexible shaft having a dilatation balloon mounted at the distal end, the balloon being formed from polymeric material and having a cylindrical midportion, an outwardly tapering conical portion at each end of the midportion and a cylindrical neck portion at the ends of the conical portions, the balloon being formed in at least two layers including an inner and outer layer, one of which is shortened and terminates in the region of the cones of the other, the necks of the balloon being adhesively attached to the shaft.
Claim 6
Dependent Claim
46 words
A balloon dilatation catheter as defined in claim 5 wherein there are at least three layers with at least one layer being disposed between the inside layer and the outside layer, the intermediate layer being of a length between that of the inside and outside layers.
Claim 7
Dependent Claim
22 words
A balloon dilatation catheter as defined in claims 5 or 6 wherein the layers are in intimate adhesive-free contact with each other.
Claim 8
Dependent Claim
68 words
A multi-layered balloon for a dilatation catheter, the balloon being formed from a plurality of layers of polymeric material and having a cylindrical midportion, cones extending from the ends of the midportion and necks extending from the ends of the cones, the cylindrical midportion having a predetermined thickness, the layers thickness of the cones and the neck portions being not substantially greater than the thickness of the midportion.
Claim 9
Dependent Claim
81 words
A balloon dilatation catheter having an elongate flexible shaft and a multi-layered balloon formed from a plurality of layers of polymeric material, the balloon being mounted to the distal end of the shaft, the balloon having a cylindrical midportion, cones extending from the ends of the midportion and necks extending from the ends of the cones, the cylindrical midportion having a predetermined thickness, the thickness of the cones and neck portions being not substantially greater than the thickness of the midportion.
Claim 10
Independent Claim
111 words
A method for making a dilatation balloon having a cylindrical midportion, cones extending from the ends of the midportions and necks extending from the ends of the cones, the balloon being formed from a polymeric material and comprising: blow molding a first balloon in a mold; removing the first balloon from the mold and trimming its ends in the region of the cones; placing the trimmed first balloon in the mold and then blow molding a subsequent balloon into intimate contact with the next previously placed balloon segment; removing the assembly of balloon layers from the mold and trimming the last formed layer to define the neck portion of the balloon.
Claim 11
Dependent Claim
28 words
A method for making a dilatation balloon as defined in claim 10 wherein the balloons are stretched axially during their formation whereby the balloon layers are biaxially oriented.
Claim 12
Independent Claim
39 words
A method for making a dilatation balloon as defined in claims 10 or 11 further comprising heat setting each balloon layer after its formation at a temperature elevated above the temperature at which the balloon layers are blow molded.
References Cited (Backward Citations)
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