Shape memory bioresorbable polymer peripheral scaffolds
First Claim
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1. A stent, comprising:
- a scaffold formed from a polymer tube and configured for being crimped to a balloon,the scaffold having a pattern of interconnected struts andthe scaffold having an expanded diameter when expanded from a crimped state by the balloon,wherein the scaffold comprises a random copolymer of poly(L-lactide) (PLLA) and polycaprolactone (PCL) and the PCL is 3 to 10 wt % or mol % of the copolymer,wherein the glass transition temperature of the random copolymer is between 30°
C. and 50°
C.,wherein the scaffold pattern includes a plurality of undulating rings having crowns and longitudinally extending links connecting one ring to another adjacent ring, wherein the crowns include W-crowns, Y-crowns, and free crowns,wherein a first link connects a first ring to an adjacent ring, the first link forms with the first ring a W-crown, and the first link forms with the adjacent ring a Y-crown;
wherein the first ring, the adjacent ring, and the first link forms repeating W-V closed cells, andwherein the W-V cells have three free crowns between the W-crown and a Y-crown.
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Abstract
Bioabsorbable scaffolds having high crush recoverability, high fracture resistance, and reduced or no recoil due to self expanding properties at physiological conditions are disclosed. The scaffolds are made from a random copolymer of PLLA and a rubbery polymer such as polycaprolactone.
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Citations
18 Claims
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1. A stent, comprising:
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a scaffold formed from a polymer tube and configured for being crimped to a balloon, the scaffold having a pattern of interconnected struts and the scaffold having an expanded diameter when expanded from a crimped state by the balloon, wherein the scaffold comprises a random copolymer of poly(L-lactide) (PLLA) and polycaprolactone (PCL) and the PCL is 3 to 10 wt % or mol % of the copolymer, wherein the glass transition temperature of the random copolymer is between 30°
C. and 50°
C.,wherein the scaffold pattern includes a plurality of undulating rings having crowns and longitudinally extending links connecting one ring to another adjacent ring, wherein the crowns include W-crowns, Y-crowns, and free crowns, wherein a first link connects a first ring to an adjacent ring, the first link forms with the first ring a W-crown, and the first link forms with the adjacent ring a Y-crown; wherein the first ring, the adjacent ring, and the first link forms repeating W-V closed cells, and wherein the W-V cells have three free crowns between the W-crown and a Y-crown. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A stent, comprising:
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a scaffold formed from a polymer tube and configured for being crimped to a balloon, the scaffold having a pattern of interconnected struts and the scaffold having an expanded diameter when expanded from a crimped state by the balloon, wherein the scaffold comprises a random copolymer of poly(L-lactide) (PLLA) and polycaprolactone (PCL) and the PCL is 1 to 75 wt % or mol % of the copolymer, wherein the crystallinity of the scaffold is 20% to 30%, wherein the scaffold pattern includes a plurality of undulating rings having crowns and longitudinally extending links connecting one ring to another adjacent ring, wherein the crowns include W-crowns, Y-crowns, and free crowns not connected to a link, wherein the scaffold pattern forms closed cells, wherein a first link connects a first ring to an adjacent ring, the first link forms with the first ring a W-crown, and the first link forms with the adjacent ring a Y-crown; wherein the first ring, the adjacent ring, and the first link form repeating W-V closed cells, wherein the W-V cells have three free crowns between a W-crown and a Y-crown. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification