Composite material endoprosthesis
First Claim
1. An endoprosthesis including a body-structure formed of a biocompatible material, said body structure including a first material having an average atomic number greater than 24 and a second material that is different than said first material, said first material being present in an amount not greater than 9% by volume based on a combined volume of said first material and said second material, wherein said 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-2 to 1e-4 and wherein the endoprosthesis has a yield strength not greater than 100,000 pounds per square inch.
3 Assignments
0 Petitions
Accused Products
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-2 to 1e-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.
124 Citations
53 Claims
- 1. An endoprosthesis including a body-structure formed of a biocompatible material, said body structure including a first material having an average atomic number greater than 24 and a second material that is different than said first material, said first material being present in an amount not greater than 9% by volume based on a combined volume of said first material and said second material, wherein said 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-2 to 1e-4 and wherein the endoprosthesis has a yield strength not greater than 100,000 pounds per square inch.
- 16. An endoprosthesis including a body structure formed of a biocompatible material, said body structure being in the form of a wire comprising a first material having an average atomic number greater than 24 and a second material that is different than said first material, said first material being present in an amount not greater than 7% by volume based on a combined volume of said first material and said second material, and wherein said 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-2 to 1e-4.
- 22. An endoprosthesis including a body structure formed of a biocompatible material, said body structure being in the form of a wire comprising a first material having an average atomic number greater than 24 and a second material that is different than said first material and nonmagnetic, said first material being present in an amount not greater than 9% by volume based on a combined volume of said first material and said second material, and wherein said 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-2 to 1e-4.
- 28. An endoprosthesis including a tubular body structure formed of a biocompatible material, an annular layer of said body structure forming an opening for receiving a member for expanding the endoprosthesis, wherein said body structure comprises a first material having an average atomic number greater than 24 and a second material that is different than said first material, said first material being present in an amount in a range of from about 30 to about 40% by volume based on a combined volume of said first material and said second material, wherein said 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-2 to 1e-4.
-
42. An endoprosthesis including a body structure formed of a biocompatible material, said body structure including a first material having an average atomic number greater than 24 and a second material that is different than said first material, said first material being present in an amount not greater than 9% by volume based on a combined volume of said first material and said second material, wherein said body structure has a controlled mass absorption coefficient effective to provide radiographic contrast corresponding to a ratio of an intensity of an incident X-ray to an intensity of a transmitted X-ray in a range of 1e-2 to 1e-4, wherein said mass absorption coefficient is controlled by selecting the volume of said first material and said second material and a size of said endoprosthesis, effective to provide the endoprosthesis with said radiographic contrast range of 1e-2 to 1e-4, wherein the endoprosthesis has a yield strength not greater than 100,000 pounds per square inch.
- 43. An endoprosthesis including a tubular body structure formed of a biocompatible material, an annular layer of said body structure forming an opening for receiving a member for expanding the endoprosthesis, wherein said body structure comprises a first material having an average atomic number greater than 24 and a second material that is different than said first material, said first material being present In an amount in a range of from about 30 to about 40% by volume based on a combined volume of said first material and said second material, wherein said body structure has a controlled mass absorption coefficient effective to provide a radiographic contrast corresponding to a ratio of an intensity of an incident X-ray to an intensity of a transmitted X-ray in a range of 1e-2 to 1e-4, wherein said mass absorption coefficient is controlled by selecting the volume of said first material and said second material and a size of said endoprosthesis, effective to provide the endoprosthesis with said radiographic contrast range of 1e-2 to 1e-4.
- 49. An endoprosthesis including a tubular body structure formed of a biocompatible material, an annular layer of said body structure forming an opening for receiving a member for expanding the endoprosthesis, wherein said body structure comprises a first material having an average atomic number greater than 24 and a second material that is different than said first material, said first material being present in an amount of not greater than 9% by volume based on a combined volume of said first material and said second material, wherein said body structure has a controlled mass absorption coefficient effective to provide a radiographic contrast corresponding to a ratio of an intensity of an incident X-ray to an intensity of a transmitted X-ray in a range of 1e-2 to 1e-4, wherein said mass absorption coefficient is controlled by selecting the volume of said first material and said second material and a size of said endoprosthesis, effective to provide the endoprosthesis with said radiographic contrast range of 1e-2 to 1e-4.
Specification