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US 9,517,149 B2Granted
Biodegradable stent with enhanced fracture toughness
AssigneeAbbott Cardiovascular Systems Inc.
InventorsDavid C. Gale, Bin Huang, Stephen Schaible
Life of this patent
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Abstract
Stents and methods of manufacturing a stents with enhanced fracture toughness are disclosed.
Claims4
A biodegradable stent comprising:
- a scaffold including struts comprising a poly(L-lactide)-based biodegradable polymer, wherein the struts have a luminal surface and an abluminal surface, wherein the polymer has induced polymer orientation in a circumferential direction, and wherein the induced polymer orientation decreases from the luminal surface to the abluminal surface of the struts, wherein the polymer has the induced polymer orientation in a radial section between the luminal surface and a transition radial distance and no induced polymer orientation between the transition radial distance and the abluminal surface, and wherein the transition radial distance is ⅓ to ½ of a radial thickness of the struts.
A biodegradable stent comprising:
- a scaffold including struts comprising a poly(L-lactide)-based biodegradable polymer, wherein the struts have a luminal surface and an abluminal surface, and wherein a luminal radial section of the struts exhibits birefringence and an abluminal radial section is optically isotropic when viewed with polarized light, wherein the luminal radial section has a thickness that is ⅓ to ½ of a radial thickness of the struts from the luminal surface to the abluminal surface.
Dependencies are inferred from the claim text.