Medical device balloons containing thermoplastic elastomers
View Patent ↗A dilatation balloon and catheter for insertion into a bodily conduit. The catheter ( 10 ) includes shaft ( 12 ) and a dilatation balloon ( 24 ) at the distal end of the shaft. The balloon is inflated via a central lumen ( 14 ) in the shaft for delivery of a fluid inflation media. The balloon is fabricated from a combination of a thermoplastic elastomer (TPE), preferably an engineering thermoplastic elastomer (ETE), with a non-compliant structural polymeric material. The combination may be a blend of the non-compliant structural polymer and the TPE. Alternatively, the combination may be a layered balloon having, for example, a non-compliant structural polymer inner layer and a soft, abrasion resistant, elastomeric outer layer. Methods for fabricating the balloon from the combination of a TPE and a non-compliant structural polymer are also disclosed.
1. A method for fabricating a dilatation balloon for use in a medical catheter device, said method comprising the steps of:
producing a generally cylindrical balloon blank from a combination of a thermoplastic elastomer and a non-compliant structural material; and
shaping said balloon blank to produce said dilatation balloon.
2. A method in accordance with claim 1 wherein said balloon blank producing step comprises disposing an elastomeric layer comprising said thermoplastic elastomer upon a structural layer comprising said non-compliant structural polymeric material to produce a layered, generally cylindrical balloon blank.
3. A method in accordance with claim 2 wherein said disposing step comprises coextruding said thermoplastic elastomer and said non-compliant structural polymeric material.
4. A method in accordance with claim 2 wherein said disposing step comprises disposing said structural layer as an inner layer and disposing said thermoplastic elastomer as an outer elastomeric layer on said inner structural layer.
5. A method in accordance with claim 2 wherein said disposing step comprises disposing said structural layer as an intermediate layer and disposing said thermoplastic elastomer as both an outer and an inner elastomeric layer on said intermediate structural layer.
6. A method in accordance with claim 1 wherein said disposing step producing step comprises: preparing a blend of a thermoplastic elastomer and a non-compliant structural polymeric material; and forming a generally cylindrical balloon blank from said blend.
7. A method in accordance with claim 1 wherein said shaping step comprises shaping said balloon blank such that said dilatation balloon has a generally cylindrical central portion and generally conical end portions.
8. The method of claim 1 , wherein the thermoplastic elastomer is selected from the group consisting of styrenic block copolymers, polyolefin blends, elastomeric alloys, thermoplastic polyurethanes, thermoplastic copolyesters, and thermoplastic polyamides.
9. The method of claim 1 , wherein the thermoplastic elastomer is an engineering thermoplastic elastomer.
10. The method of claim 1 , wherein the thermoplastic elastomer is a polyether glycol/polybutylene terephthalate block copolymer.
11. The method of claim 1 , wherein the non-compliant structural material is selected from the group consisting of modified polyesters, polyethylene terephthalate, modified polybutylenes, polyvinyl chlorides, polyamides, and combinations thereof.
12. The method of claim 1 , wherein the non-compliant structural material is biaxially oriented.
13. The method of claim 1 , wherein the non-compliant structural material is biaxially oriented polyethylene terephthalate.