Crush recoverable polymer scaffolds
First Claim
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1. A balloon-expandable medical device for being implanted in a peripheral vessel of the body, comprising:
- a scaffold formed from a polymer tubeconfigured for being crimped to a balloon,the scaffold having a pattern of interconnected elements andthe scaffold having an expanded diameter when plastically deformed from a crimped state by the balloon,wherein the scaffold attains greater than 90% of the expanded diameter after being crushed by an amount equal to at least 33% of the expanded diameter; and
wherein the scaffold has a radial stiffness greater than 0.3 N/mm.
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Abstract
A medical device includes a polymer scaffold crimped to a catheter having an expansion balloon. The scaffold, after being deployed by the balloon, provides a crush recovery of about 90% after the diameter of the scaffold has been pinched or crushed by 50%. The scaffold has a pattern including an asymmetric closed cell connecting links connecting the closed cells.
37 Citations
24 Claims
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1. A balloon-expandable medical device for being implanted in a peripheral vessel of the body, comprising:
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a scaffold formed from a polymer tube configured for being crimped to a balloon, the scaffold having a pattern of interconnected elements and the scaffold having an expanded diameter when plastically deformed from a crimped state by the balloon, wherein the scaffold attains greater than 90% of the expanded diameter after being crushed by an amount equal to at least 33% of the expanded diameter; and wherein the scaffold has a radial stiffness greater than 0.3 N/mm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A balloon-expandable medical device, comprising:
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a scaffold crimped to a balloon, the crimped scaffold adapted for being plastically deformed by the balloon such that the plastically deformed scaffold has a diameter 300-400% greater than a diameter of the crimped scaffold; and wherein the plastically deformed scaffold is capable of regaining more than 90% of the plastically deformed scaffold diameter after being crushed to at least 75% of the plastically deformed scaffold diameter. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A peripherally implantable medical device, comprising:
a crimped scaffold that when plastically deformed by a balloon forms a scaffold having an expanded diameter, wherein, the scaffold regains more than 90% of the expanded diameter after being crushed to at least 67% of the expanded diameter, the scaffold is formed from PLLA, the scaffold has a pre-crimp diameter of 7 to 10 mm, the scaffold has struts and links, wherein a strut and/or link has a width to thickness ratio of between about 0.8 and 1.4, and the scaffold has a radial stiffness greater than or equal to 0.3 N/mm. - View Dependent Claims (23, 24)
Specification