Bioabsorbable stent
AssigneesJapan Medical Device Technology Co., Ltd., National University Corporation Kumamoto University
InventorsMakoto Sasaki, Takuro Niidome, Zhen Yu Jin, Shuzo Yamashita
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Abstract
Provided is a biodegradable polymer coating stent effective in delaying the damage of physical properties (particularly radial force) of a core structure. The stent includes a core structure of a bioabsorbable material (e.g., Mg), a first coating layer of a first polymer with biodegradability, and a second coating layer of a second polymer with biodegradability, wherein the first coating layer covers the whole surface of the core structure; the second coating layer covers a part or the whole surface of the first coating layer; the first polymer has a glass transition point of lower than 37° C.; and the second polymer has a glass transition point of 47° C. or higher.
Claims10
A stent, comprising:
- a core structure of a bioabsorbable magnesium alloy;
- a first coating layer of a first polymer with biodegradability, the first coating layer covering the whole surface of the core structure and the first polymer having a glass transition point of lower than 37° C.;
- and
- a second coating layer of a second polymer with biodegradability, the second coating layer covering a part or the whole surface of the first coating layer, and the second polymer having a glass transition point of 47° C. or higher,
- wherein
- a combination of the first polymer and the second polymer is, as combinations of first polymer/second polymer, PCL/PDLLA or PLCL/PDLLA,
- a composite is formed between the first coating layer and the second coating layer,
- the bioabsorbable magnesium alloy includes a plurality of cell units, each of the cell units among the plurality of cell units including a first group of first cells and a second group of second cells,
- adjacent cell units among the plurality of cell units are connected with each other by a first connecting member, the first connecting member extending in a circumferential direction of the stent and having a portion with a curvature radius of 40 μm to 100 μm which is open in an axis direction of the stent,
- a plurality of tubular units are arranged in the axis direction of the stent, the plurality of tubular units including a first tubular unit and a second tubular unit, and
- a portion of cells of the first tubular unit oppose and are connected with a corresponding portion of cells of the second tubular unit, by a second connecting member, the second connecting member extending in the axis direction of the stent and having a portion with a curvature radius of 40 μm to 100 μm which is open in a circumferential direction of the stent.
Dependencies are inferred from the claim text.