Necking stents
First Claim
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1. A stent comprising:
- a. a tube formed of unexpanded polymer sheetb. a plurality of holes through the sheet,c. said polymer sheet being a thermoplastic havingi. a glass transition temperature between 5 degrees and 39 degrees Celsius,ii. a minimum tensile strength after necking of 15 MPa,iii. a minimum yield strength after necking of 10 MPa,iv. a maximum fractional cross-sectional area after necking of 0.5, andv. a compatibility with human body fluids.
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Abstract
A stent is made from a thermoplastic material having a glass transition temperature below the normal temperature of the human body. Therefore the thermoplastic polymer may be necked in situ. The stent is made with a series of circumferential strips.
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Citations
20 Claims
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1. A stent comprising:
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a. a tube formed of unexpanded polymer sheet b. a plurality of holes through the sheet, c. said polymer sheet being a thermoplastic having i. a glass transition temperature between 5 degrees and 39 degrees Celsius, ii. a minimum tensile strength after necking of 15 MPa, iii. a minimum yield strength after necking of 10 MPa, iv. a maximum fractional cross-sectional area after necking of 0.5, and v. a compatibility with human body fluids. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A stent for blood vessels comprising:
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a. a tube formed of an unexpanded polymer sheet having a wall thickness of about 0.5 mm, b. a plurality of circumferential bands having strips of uniform width, and said bands having tabs of greater width evenly spaced between the strips, c. said polymer sheet being a thermoplastic having i. a glass transition temperature between 20 degrees and 35 degrees Celsius, ii. a minimum tensile strength after necking of 25 MPa, iii. a minimum yield strength after necking of 15 MPa, iv. a maximum fractional cross-sectional area after necking of 0.33, and v. a compatibility with human blood and being condusive to endothelialization, and d. said thermoplastic selected from the group of polymers consisting of polyethylene, polypropylene, polyacrylonitrile, polyehylene terephthalate, and polybutylene terephthalate.
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20. The process of inserting a stent into a vessel comprising:
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A. inserting said stent into the vessel, said stent before insertion being i. a tube formed of an unexpanded polymer sheet, ii. a plurality of holes through the sheet, iii. said polymer sheet being a thermoplastic having; a. a glass transition temperature between 5 degrees and 39 degrees Celsius, b. a minimum tensile strength after necking of 15MPa, c. a minimum yield strength after necking of 10MPa, d. a maximum fractional cross-sectional area after necking of 0.5, and e. a compatibility with human body fluids, B. expanding the stent until portions of the sheet forming stent are necked.
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Specification