Coil bioabsorbable bifurcation stent
A bioabsorbable, expandable coil bifurcation stent having a first, second, and third segment, in which the second and third segments are extensions of a coiled fiber in the first segment. Also disclosed is a three-segment expandable coil bifurcation stent in which the second and third segments extend from supporting fibers in the first segment. Further disclosed is an expandable bifurcation stent in which supporting fibers in the first segment also support the second and third segments. The three segments are independently adjustable to fit varied geometries.
1. A bioabsorbable stent convertible between a furled state and an expanded state, comprising;
a first segment having a longitudinal axis and a circumference, the first segment containing a helically coiled fiber extending along the entire longitudinal axis of the first segment and extending around the circumference of the first segment and defining a first coil structure, and a first longitudinally disposed supporting fiber and a second longitudinally disposed supporting fiber each spaced around the first coil structure and attached at selected points along the length of the first coil structure;
a second segment having a longitudinal axis and a circumference, the second segment containing a second helically coiled fiber extending along the entire longitudinal axis of the second segment and extending around the circumference of the second segment and defining a second coil structure, and a portion of the first longitudinally disposed supporting fiber attached at selected points along the length of the second coil structure; and
a third segment having a longitudinal axis and a circumference, the third segment containing a third helically coiled fiber extending along the entire longitudinal axis of the third segment and extending around the circumference of the third segment and defining a third coil structure, and a portion of the second longitudinally disposed supporting fiber attached at selected points along the length of the third coil structure, wherein all of the helically coiled fibers and supporting fibers contain bioabsorbable polymeric material.
2. The bioabsorbable stent of claim 1 , wherein each of the helically coiled fibers or each of the supporting fibers includes a drug.
3. The bioabsorbable stent of claim 1 , wherein the bioabsorbable stent has a predetermined rate of degradation.
4. The bioabsorbable stent of claim 1 , wherein the bioabsorbable polymeric material is selected from the group consisting of polydioxanone, polyglycolide, polycaprolactone, polylactides, poly-L-lactide, poly-D,L-lactide, poly (L-lactide-co-glycolide), poly (D,L-lactide-co-glycolide), poly (L-lactide-co-D,L-lactide), poly (L-lactide-co-trimethylene carbonate), polyhydroxyvalerate, and ethylvinylacetate.