Composition and method for making a biodegradable drug delivery stent
First Claim
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1. A stent for supporting a blood vessel, comprising:
- (a) a stent body;
(b) a biodegradable, porous stent substrate swelled in 40% trifluoacetic acid with polyethylene oxide applied on said stent body, wherein the pores of said stent substrate are opened upon swelling said stent substrate; and
(c) a polymer mixture coating said stent substrate, said polymer mixture including biologically active microspheres, and wherein said polymer mixture fills and collapes the pores of said stent substrate.
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Abstract
A stent or vascular graft for supporting a blood vessel or organ lumen is coated with a biodegradable, resorbable and hemocompatible surface substrate. Biologically active microspheres which controllably release the biologically active agent into the vessel wall or organ to inhibit restenosis of the stent is embedded in the stent substrate. The biologically active microspheres include encapsulated PGE1 in a water soluble polyethylene glycol mix, which over a period of time dissolves and releases the PGE1 into the vessel wall or organ.
357 Citations
10 Claims
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1. A stent for supporting a blood vessel, comprising:
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(a) a stent body; (b) a biodegradable, porous stent substrate swelled in 40% trifluoacetic acid with polyethylene oxide applied on said stent body, wherein the pores of said stent substrate are opened upon swelling said stent substrate; and (c) a polymer mixture coating said stent substrate, said polymer mixture including biologically active microspheres, and wherein said polymer mixture fills and collapes the pores of said stent substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of modifying cellular response in a blood vessel or organ to a disease, injury or foreign body, comprising the steps of:
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a) forming a water soluble and resorbable hemocompatible stent coating; b) swelling said stent coating in 40% trifluoacetic acid with polyethylene oxide to open the pores of said stent coating; c) embedding microspheres having a biologically active agent encapsuled in said microspheres in said stent coating; d) applying said stent coating on a stent body; e) positioning said stent body in the blood vessel or organ; and f) controllably releasing said biologically active agent into the blood vessel wall or target organ.
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Specification