Deformation of a polymer tube in the fabrication of a medical article
First Claim
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1. A method for fabricating an implantable medical device comprising:
- treating at least a portion of a tube comprising a polymer with a solvent capable of inducing crystallization in the polymer;
radially and axially deforming the tube including radially deforming the tube between 100% and 400% while the tube has a temperature above the glass transition temperature of the polymer of the tube; and
fabricating the implantable medical device from the deformed and treated tube;
wherein the implantable medical device is a stent and the polymer is PLLA.
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Abstract
Methods of manufacturing a medical article that include radial deformation of a polymer tube are disclosed. A medical article, such as an implantable medical device or an inflatable member, may be fabricated from a deformed tube.
384 Citations
9 Claims
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1. A method for fabricating an implantable medical device comprising:
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treating at least a portion of a tube comprising a polymer with a solvent capable of inducing crystallization in the polymer; radially and axially deforming the tube including radially deforming the tube between 100% and 400% while the tube has a temperature above the glass transition temperature of the polymer of the tube; and fabricating the implantable medical device from the deformed and treated tube; wherein the implantable medical device is a stent and the polymer is PLLA. - View Dependent Claims (2, 3, 4, 5, 6, 9)
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7. A method for fabricating a stent comprising:
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while a polymer tube made from PLLA has a temperature greater than the glass transition temperature of the polymer, biaxially orientating the molecular structure of the polymer including radially deforming the tube between 100% and 400% and axially deforming the tube including applying a tension to produce a controlled rate of axial deformation of the tube; heat setting the deformed tube above the glass transition temperature including maintaining the between 100% and 400% radial deformation of the tube by maintaining an internal pressure within the tube; applying a solvent for the polymer of the tube to induce crystallization in the polymer; and laser cutting the tube to produce a network of interconnected struts, wherein the combination of the biaxially oriented molecular structure and crystallization in the polymer are such as to produce an increase in the radial strength of the stent. - View Dependent Claims (8)
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Specification