Multilayered biodegradable stent and method of manufacture
First Claim
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1. A method of fabricating a biodegradable, drug releasing stent for implantation within a lumen, comprising the steps of:
- forming a first layer of biodegradable material having physical properties necessary to enable a stent to maintain patency of said lumen;
forming a second layer of biodegradable material which releases a selected drug upon exposure to an environment such as is encountered within said lumen; and
superposing said second layer on said first layer to provide a laminated structure that is biodegradable, drug releasing and has the physical properties necessary for said stent to perform its structural function within said lumen.
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Abstract
A stent of multilayered laminated construction wherein one layer addresses the structural requirements of the stent and additional layers release drugs at predictable rates. Both the structural layer as well as the drug releasing layers are eventually completely resorbed by the body.
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Citations
25 Claims
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1. A method of fabricating a biodegradable, drug releasing stent for implantation within a lumen, comprising the steps of:
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forming a first layer of biodegradable material having physical properties necessary to enable a stent to maintain patency of said lumen; forming a second layer of biodegradable material which releases a selected drug upon exposure to an environment such as is encountered within said lumen; and superposing said second layer on said first layer to provide a laminated structure that is biodegradable, drug releasing and has the physical properties necessary for said stent to perform its structural function within said lumen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An expandable stent for implantation in a vessel, comprising:
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a first layer formed of a first resorbable material selected to impart structural rigidity to said stent for maintaining patency of the vessel; and second layer formed of a second resorbable material, superposed on and laminated to said first layer and selected to release a therapeutic drug at a predictable rate upon implantation;
said first layer and said second layer rolled up to form a cylinder for delivery to the site at which the stent is to be implanted; andsaid stent providing a desired degree of structural support to said vessel, and releasing said drug at said predictable rate. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification