EP0274411A2
Expired / Lapsed
EP
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Thin wall high strength balloon and method of manufacture
Assignee: CR Bard Inc
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Filing: 1988-01-05
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Granted: —
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Expires: 2008-01-05
Abstract
Abstract A balloon for use in medical procedures such as in dilatation catheter in which the balloon is formed from a tubular thin wall parison of orientable semicrystalline polymer (polyethylene terephthalate being preferred) which is stretched very close to the elastic limit of the material and is then heat set. The balloon thus produced is extremely strong and has a very thin and higly flexible wall and is dimensionally stable both in storage and when inflated. The preferred balloon has a wall thickness to diameter ratio of less than 5.0 x 10-3 and a radial tensile strength (hoop strength) greater than 35,000 psi.
Inventors
- 👤 Mark Anthony Saab
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-22 22:53
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/10; A61M25/1027; A61M25/1029; A61L; A61L29/00; A61L29/04; A61L29/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
29 words
A biaxially oriented, flexible, polymeric balloon having a wall thickness to diameter ratio of less than 5.0 x 10⁻³ and a radial tensile strength greater than about 35,000 psi.
Claim 2
Dependent Claim
29 words
A biaxially oriented, flexible, polymeric balloon having a wall thickness to diameter ratio of less than 5.0 x 10⁻³ and a radial tensile strength greater than about 35,000 psi.
Claim 3
Dependent Claim
18 words
A balloon as defined in claim 1 wherein the radial tensile strength is between 35,000 and 90,000 psi.
Claim 4
Dependent Claim
20 words
A balloon as defined in claim 1 wherein said balloon has a burst strength of up to about 25 bars.
Claim 5
Dependent Claim
17 words
A biaxially oriented, semicrystalline, flexible polymeric balloon having a radial tensile strength greater than about 35,000 psi.
Claim 6
Dependent Claim
17 words
A biaxially oriented, semicrystalline, flexible polymeric balloon having a radial tensile strength greater than about 35,000 psi.
Claim 7
Dependent Claim
17 words
A balloon as defined in claim 4 having a burst strength of up to about 25 bars.
Claim 8
Dependent Claim
13 words
A balloon as defined in any claims 1-5, said balloon being heat set.
Claim 9
Dependent Claim
15 words
A balloon as defined in any of claims 1-6 wherein the polymer comprises polyethylene terephthalate.
Claim 10
Dependent Claim
21 words
A dilatation catheter having a shaft portion and a balloon portion, the balloon comprising the balloon of any of claims 1-7.
Claim 11
Dependent Claim
17 words
Biaxially oriented, flexible, polymeric balloon heat set having an F5 radial tensile strength greater than 30,000 psi.
Claim 12
Dependent Claim
17 words
Biaxially oriented, flexible, polymeric balloon heat set having an F5 radial tensile strength greater than 30,000 psi.
Claim 13
Independent Claim
160 words
A method for forming a biaxially oriented flexible polymeric balloon comprising providing a thin walled tubular parison of orientable semicrystalline polymer having a wall to inner diameter ratio of less than 0.45; at a temperature within the range extending from the second order transition temperature to the first order transition temperature, drawing said parison axially to a length which is 2.5 to 6 times the starting length thereof and thereafter expanding the drawn tubing radially to an internal diameter which is six to eight times the initial internal diameter of the parison into an outer diameter which is equal to or greater than about four times the starting outer diameter of the parison, and while maintaining the balloon in said expanded state, raising the temperature of the balloon above the stretching temperature to raise the crystalline content of the balloon material, followed by cooling the drawn, expanded and heat set tubing to temperature less than its second order transition temperature.
Claim 14
Independent Claim
160 words
A method for forming a biaxially oriented flexible polymeric balloon comprising providing a thin walled tubular parison of orientable semicrystalline polymer having a wall to inner diameter ratio of less than 0.45; at a temperature within the range extending from the second order transition temperature to the first order transition temperature, drawing said parison axially to a length which is 2.5 to 6 times the starting length thereof and thereafter expanding the drawn tubing radially to an internal diameter which is six to eight times the initial internal diameter of the parison into an outer diameter which is equal to or greater than about four times the starting outer diameter of the parison, and while maintaining the balloon in said expanded state, raising the temperature of the balloon above the stretching temperature to raise the crystalline content of the balloon material, followed by cooling the drawn, expanded and heat set tubing to temperature less than its second order transition temperature.
Claim 15
Dependent Claim
21 words
A method as defined in claim 10 wherein the expanding means is pressurized fluid applied to the inside of the tubing.
Claim 16
Dependent Claim
11 words
A method of claim 10 wherein the polymer comprises polyethylene terephthalate.
References Cited (Backward Citations)
No citation records indexed.
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