Method for the manufacture of intraluminal stents of bioresorbable polymeric material
First Claim
1. A method for the manufacture of intravascular stents of bioresorbable polymeric material, comprising the following steps:
- preparing a viscous polymer solution of poly-β
-hydroxybutanoic acid as a bioresorbable polymeric material in a solvent,successively coating a surface of a male mold core (2) with layers of the polymer solution in several steps by precipitation of the polymeric material by the solvent being evaporated and by the layer previously precipitated being dissolved at least partially for a homogeneous stent blank (1) to build up,drawing the stent blank (1) off the male mold core (2), andsubsequently treating the stent blank (1) to finish the shaping of the stent.
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Abstract
A method for the manufacture of intravascular stents of bioresorbable material comprises the following steps:
preparing a viscous solution of poly-β-hydroxybutanoic acid as a bioresorbable polymeric material in a solvent,
successively coating a male mold core with layers of the polymer solution in several steps by precipitation of the polymeric material by the solvent being evaporated and by the layer previously precipitated being dissolved at least partially for a homogeneous stent blank to build up,
drawing the stent blank off the male mold core, and
subsequently treating the stent blank to finish the shaping of the stent.
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Citations
20 Claims
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1. A method for the manufacture of intravascular stents of bioresorbable polymeric material, comprising the following steps:
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preparing a viscous polymer solution of poly-β
-hydroxybutanoic acid as a bioresorbable polymeric material in a solvent,successively coating a surface of a male mold core (2) with layers of the polymer solution in several steps by precipitation of the polymeric material by the solvent being evaporated and by the layer previously precipitated being dissolved at least partially for a homogeneous stent blank (1) to build up, drawing the stent blank (1) off the male mold core (2), and subsequently treating the stent blank (1) to finish the shaping of the stent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10, 14, 15, 16, 19, 20)
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8. A method for the manufacture of intravascular stents of bioresorbable polymeric material, comprising:
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preparing a viscous chloroform solution of poly-β
-hydroxy-butanoic acid as a bioresorbable polymeric material,applying the chloroform solution of poly-β
-hydroxy-butanoic acid directly to a surface of the male mold core (2), and successively coating with additional layers of the solution by precipitation of the polymeric material by evaporation of the chloroform and by the layer previously precipitated being dissolved at least partially for a homogeneous stent blank (1) to build up on said male mold surface,removing the stent blank (1) from the male mold core (2), and subsequently finishing the shaping of the stent; wherein prior to being coated with the solution, the male mold core (2) is coated with a biocompatible release agent (8), which is insoluble in chloroform, but soluble in other solvents. - View Dependent Claims (9, 17, 18)
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11. A method for the manufacture of intravascular stents of bioresorbable polymeric material, comprising:
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preparing a viscous solution of poly-β
-hydroxy-butanoic acid as a bioresorbable polymeric material in a solvent,successively coating a male mold core (2) with layers of the polymeric material in several steps by precipitation of the polymeric material by evaporation of the solvent and by the layer previously precipitated being dissolved at least partially for a homogeneous stent blank (1) to build up, removing the stent blank (1) from the male mold core (2), and subsequently finishing the shaping of the stent; wherein at least one of a pharmaceutical anticoagulant and a cell-proliferation-inhibiting agent (10) is added to the solution, and is incorporated in the volume of the stent homogeneously for continuous release during bioresorption of the stent.
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12. A method for the manufacture of intravascular stents of bioresorbable polymeric material, comprising:
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preparing a viscous solution of poly-β
-hydroxy-butanoic acid as a bioresorbable polymeric material in a solvent,successively coating a male mold core (2) with layers of the polymeric material in several steps by precipitation of the polymeric material by the evaporation of solvent and by the layer previously precipitated being dissolved at least partially for a homogeneous stent blank (1) to build up, removing the stent blank (1) from the male mold core (2), and subsequently finishing the shaping of the stent; wherein at least one of a pharmaceutical anticoagulant and a cell-proliferation-inhibiting agent (10) is added to the solution, and is spread in one or several layers (9) for continuous release during bioresorption of the stent.
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13. A method for the manufacture of intravascular stents of bioresorbable polymeric material, comprising:
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preparing a viscous solution of poly-β
-hydroxy-butanoic acid as a bioresorbable polymeric material in a solvent,successively coating a male mold core (2) with layers of the polymeric material in several steps by precipitation of the polymeric material by the evaporation of solvent and by the layer previously precipitated being dissolved at least partially for a homogeneous stent blank (1) to build up, and wherein particles (14) of at least one of silver and silver alloys are added to the solution for being incorporated as an X-ray contrast medium and inflammation-inhibiting agent into the volume of the stent, removing the stent blank (1) from the male mold core (2), and subsequently finishing the shaping of the stent.
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Specification