Dual surface protection coating for drug delivery balloon catheters and stents
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United States of America Patent
Stats
-
Dec 2, 2003
Issued Date -
N/A
app pub date -
May 22, 2002
filing date -
Feb 3, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a medical device, such as a stent or a balloon catheter that includes an expandable body portion which has an exterior surface that contacts a vessel wall during treatment. The medical device includes a first coating disposed over at least a portion of the exterior surface. The first coating includes a therapeutic substance that is intended for controlled release from the exterior surface. The medical device further includes a second coating overlaying at least a substantial portion of the first coating. The second coating includes a material that is generally impervious to elution of the therapeutic substance therethrough when the body portion is inserted into the vessel lumen. The material of the second coating is relatively inelastic so that the second coating fractures during expansion of the body portion to allow elution of the therapeutic substance through fissures formed in the second coating.
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