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US 9,517,150 B2Granted
Time-dependent polymer scaffolds
AssigneeAbbott Cardiovascular Systems Inc.
InventorsSyed Hossainy, Mikael Trollsas, Michael Huy Ngo, Erik David Eli
Life of this patent
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Abstract
A medical device includes a polymer scaffold crimped to a catheter having an expansion balloon. The scaffold has a structure that produces a low late lumen loss when implanted within a peripheral vessel and also exhibits a high axial fatigue life. In a preferred embodiment the scaffold forms ring structures interconnected by links, where a ring has 12 crowns and at most two links connecting adjacent rings.
Claims9
A medical device, comprising:
- a balloon;
- a scaffold that was cut from a tube comprising PLLA, wherein the tube has a ratio of diameter to wall thickness of between 20-40;
- wherein the scaffold forms a network of rings interconnected by links, including
- at least 8 crests and 8 troughs per ring,
- a first ring,
- a second ring adjacent the first ring, and
- at most 2 links connecting the first ring to the second ring;
- wherein the scaffold is crimped to the balloon by plastic deformation of the scaffold such that the scaffold has a crimped state;
- wherein the scaffold has a post-dilation diameter when plastically deformed from the crimped state by inflation of the balloon and the scaffold attains over 80% of the post-dilation diameter after being crushed by an amount equal to over 50% of the post-dilation diameter;
- and
- wherein the scaffold rings comprise struts and at least 90% of the struts are intact after a six-month simulated walking test.
8 more elements
A medical device, comprising:
- a scaffold formed from a radially expanded polymer tube and configured for being crimped to a balloon by plastic deformation of the scaffold wherein the plastically deformed scaffold has a crimped state;
- the scaffold having a pre-crimp diameter and a wall thickness, wherein a ratio of the pre-crimp diameter to the wall thickness is between 20-40, and wherein the scaffold forms a network of rings interconnected by links, including
- at least 8 crests and 8 troughs per ring,
- a first ring,
- a second ring adjacent the first ring, and
- at most 2 links connecting the first ring to the second ring;
- wherein the scaffold has a post-dilation diameter when plastically deformed from the crimped state by inflation of the balloon and the scaffold attains over 80% of the post-dilation diameter after being crushed by an amount equal to over 50% of the post-dilation diameter.
4 more elements
Dependencies are inferred from the claim text.