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US 8,052,743 B2Granted
Endoprosthesis with three-dimensional disintegration control
AssigneeBoston Scientific Scimed, Inc.
InventorsJan Weber, Liliana Atanasoska
Life of this patent
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Abstract
The present invention comprises a medical device having a support structure made from alternating layers. One or more layers may be made by direct metal laser sintering. One or more layers may be made by introducing nitrogen into a previously formed layer via excimer laser nitriding.
Claims18
A method of making a biodisintegrable endoprosthesis, the method comprising:
- forming a first layer of biodisintegrable metal on a support structure by direct metal laser sintering a metal powder, wherein the first layer is biodisintegrable;
- and
- introducing a first nitrogen content into a first part of the first layer by excimer laser nitriding.
A method of making a support structure for a medical device, the method comprising:
- constructing, on the support structure, a first layer of iron by direct metal laser sintering;
- introducing a first nitrogen content into a first part of the first layer by excimer laser nitriding;
- constructing a second layer of magnesium, upon the first layer, by direct metal laser sintering, wherein, after excimer nitriding, the second layer has a ratio of nitrogen to magnesium of less than 0.45.
A method of making a support structure for a medical device, the method comprising:
- constructing, on the support structure, a first layer of iron by direct metal laser sintering;
- introducing a first nitrogen content into a first part of the first layer by excimer laser nitriding;
- constructing a second layer of magnesium, upon the first layer, by direct metal laser sintering, wherein, after excimer nitriding, the second layer has a ratio of nitrogen to magnesium of greater than 0.45.
Dependencies are inferred from the claim text.