Composite material endoprosthesis
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United States of America Patent
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Feb 22, 2000
Issued Date -
N/A
app pub date -
Mar 30, 1998
filing date -
May 28, 1996
priority date (Note) -
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Abstract
An endoprosthesis includes a body structure formed of a biocompatible material, the body structure including a first material having an average atomic number greater than 24 and a second material that is different than the first material. The body structure has a mass absorption coefficient effective to provide a ratio of an intensity of an incident X-ray to an intensity of a transmitted X-ray in a range of 1e.sup.-2 to 1e.sup.-4. The endoprosthesis may have a yield strength not greater than 100,000 psi. The endoprosthesis may be in the form of a wire or a tube. In one embodiment the first material is present in an amount not greater than 9% by volume based on the combined volume of the first and second materials. In another embodiment, about 30 to about 40% by volume of the first material is present based on a combined volume of the first and second materials in an endoprosthesis of tubular form.
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