Stent
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United States of America Patent
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-
Dec 21, 2004
Grant Date -
Feb 13, 2003
app pub date -
Jul 5, 2002
filing date -
Jul 6, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A stent wherein a biologically/physiologically active substance is loaded on the stent main body is provided. The active substance is gradually released for a prolonged period without being rapidly released in a short period. The stent comprises a stent main body, and a sustained release coating formed on the stent main body; wherein the coating comprises a biologically/physiologically active substance layer formed on the stent main body, and a polymer layer formed on the biologically/physiologically active substance layer; and the biologically/physiologically active substance layer comprises at least one biologically/physiologically active substance; the polymer layer comprises a vapor or water-permeable polymer, and a water-swellable substance dispersed in the polymer and swollen by absorption of the vapor or the water; and cracks are formed in the polymer layer when the water-swellable substance is swollen by absorbing the vapor or the water.
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