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US 8,057,534 B2Granted
Bioerodible endoprostheses and methods of making the same
AssigneeBoston Scientific Scimed, Inc.
InventorsDennis A. Boismier, Timothy S. Girton, Steven R. Larsen, Matt Shedlov, Ken Merdan, Barry O'Brien
Life of this patent
Estimating the term…
Abstract
A bioerodible endoprosthesis erodes to a desirable geometry that can provide, e.g., improved mechanical properties or degradation characteristics.
Claims23
An endoprosthesis, comprising:
- a plurality of struts, the plurality of struts comprising a plurality of generally circumferential struts being interconnected to one another or connected by one or more connecting struts, wherein at least one strut of the plurality of struts comprises a bioerodible magnesium or a bioerodible magnesium alloy, the at least one strut having a longest dimension extending in a z-axis, the at least one strut having a cross-section in an X-Y plane perpendicular to the z-axis, wherein the at least one strut has an initial geometry in the X-Y plane characterized by initial dimensions, and
- an erosion modifying material provided on the surface of the at least one strut which controls erosion to form a predetermined geometry such that, after erosion of at least about 50 percent of the area of the at least one strut in the X-Y plane, at least one initial dimension of the initial geometry is maintained in the X-Y plane.
An endoprosthesis, comprising:
- a strut comprising a bioerodible magnesium or a bioerodible magnesium alloy, the strut having a longest dimension extending in a z-axis, the strut having a cross-section in an X-Y plane perpendicular to the z-axis, wherein the strut has an initial geometry in the X-Y plane characterized by initial dimensions, and
- an erosion modifying material provided on the surface of the strut which controls erosion to form an I-shape in the X-Y plane after erosion of at least about 50 percent of the area of the strut in the X-Y plane.
An endoprosthesis, comprising:
- a plurality of struts, the plurality of struts comprising a plurality of generally circumferential struts being interconnected to one another or connected by one or more connecting struts, wherein at least one strut of the plurality of struts comprises a bioerodible magnesium or a bioerodible magnesium alloy, at least one strut having an initial geometry in X, Y, and Z directions, the at least one strut having a longest dimension extending in the Z direction, the X, Y, and Z directions each being perpendicular to each other;
- and
- an erosion modifying material provided on the surface of the at least one strut which controls erosion to form a predetermined geometry such that, after erosion of at least about 50 percent of the at least one strut, at least two initial dimensions in the X, Y, and Z directions are maintained.
Dependencies are inferred from the claim text.