Method of fabricating an implantable medical device with biaxially oriented polymers

Inactive Publication Date: 2006-01-26
ABBOTT CARDIOVASCULAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0010] The present invention is directed to methods for fabricating an implantable medical device, such as a stent, from a tube, with desirable mechanical properties, such as improved circumferential strength and rigidity. Improved circumferential strength and rigi

Problems solved by technology

However, the characteristics of the material of which a stent is composed also affects the mechanical properties of the stent.
Other potential shortcomings of metal stents include adverse reactions

Method used

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  • Method of fabricating an implantable medical device with biaxially oriented polymers
  • Method of fabricating an implantable medical device with biaxially oriented polymers
  • Method of fabricating an implantable medical device with biaxially oriented polymers

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Embodiment Construction

[0025] For the purposes of the present invention, the following terms and definitions apply:

[0026]“Stress” refers to force per unit area, as in the force acting through a small area within a plane. Stress can be divided into components, normal and parallel to the plane, called normal stress and shear stress, respectively. True stress denotes the stress where force and area are measured at the same time. Conventional stress, as applied to tension and compression tests, is force divided by the original gauge length.

[0027] The term “elastic deformation” refers to deformation of an object in which the applied stress is small enough so that the object retains its original dimensions or essentially its original dimensions once the stress is released.

[0028]“Elastic limit” refers to the maximum stress that a material will withstand without permanent deformation.

[0029] The term “plastic deformation” refers to permanent deformation that occurs in a material under stress after elastic limi...

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Abstract

Methods and systems for manufacturing an implantable medical device, such as a stent, from a tube with desirable mechanical properties, such as improved circumferential strength and rigidity, are described herein. Improved circumferential strength and rigidity may be obtained by inducing molecular orientation in materials for use in manufacturing an implantable medical device. Some embodiments may include inducing molecular orientation by expansion of a molten annular polymer film. Other embodiments may include inducing circumferential molecular orientation by inducing circumferential flow in a molten polymer. In certain embodiments, circumferential orientation may be induced by expansion of a polymer tube. Further embodiments may include manufacturing an implantable medical device from a biaxially oriented planar polymer film.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to methods of fabricating implantable medical devices such as stents. [0003] 2. Description of the State of the Art [0004] This invention relates to radially expandable endoprostheses which are adapted to be implanted in a bodily lumen. An “endoprosthesis” corresponds to an artificial implantable medical device that is placed inside the body. A “lumen” refers to a cavity of a tubular organ such as a blood vessel. A stent is an example of these endoprostheses. Stents are generally cylindrically shaped devices which function to hold open and sometimes expand a segment of a blood vessel or other anatomical lumen such as urinary tracts and bile ducts. Stents are often used in the treatment of atherosclerotic stenosis in blood vessels. “Stenosis” refers to a narrowing or constriction of the diameter of a bodily passage or orifice. In such treatments, stents reinforce body vessels and prevent resten...

Claims

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Application Information

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IPC IPC(8): A61F2/06B29C48/09B29C48/32B29C48/33
CPCA61F2/91B23K26/4065B29C47/0023B29C47/0057A61L31/148B29L2031/7534B29C49/786A61F2/82A61F2002/825B29C47/24B23K2103/42B23K2103/50B29C48/09B29C48/0018B29C48/33
Inventor HUANG, BINSCHAIBLE, STEPHENKAUFMAN, RICHARDKENNEDY, JIMGALE, DAVID C.AMIN, SURESHGUARDIANO, JOHN
Owner ABBOTT CARDIOVASCULAR
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