Medical devices having MRI compatible metal alloys
First Claim
1. An MRI compatible implantable medical device, comprising:
- at least one non-magnetic metal alloy portion, wherein said non-magnetic metal alloy portion comprises;
a bulk portion including a first and at least a second metal different from said first metal;
wherein a surface of said non-magnetic metal alloy portion includes an integral MRI heating resistant surface structure having a thickness >
3 nanometers, andwherein said surface is structurally different from said bulk portion and comprises a lamellar nanostructure or microstructure.
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Accused Products
Abstract
An MRI compatible medical device includes a non-magnetic metal alloy portion having a bulk portion including a first and a second metal. A surface of the metal alloy portion includes an integral MRI heating resistant surface structure having a thickness ≧3 nanometers. The non-magnetic metal alloy portion is structurally different from the bulk portion and includes a lamellar nanostructure or microstructure. The MRI heating resistant surface structure can include (i) a matrix phase including the first and second metal having nanometer or micron scale particles, precipitates and/or inclusions that differ in chemical composition and physical characteristics of the matrix phase and are discontinuously distributed therein; (ii) a level of crystallinity at least 5% less than the bulk portion; and/or (iii) metal atoms different from the first and second metal having a concentration profile evidencing diffusion into the metal alloy portion.
24 Citations
13 Claims
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1. An MRI compatible implantable medical device, comprising:
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at least one non-magnetic metal alloy portion, wherein said non-magnetic metal alloy portion comprises; a bulk portion including a first and at least a second metal different from said first metal; wherein a surface of said non-magnetic metal alloy portion includes an integral MRI heating resistant surface structure having a thickness >
3 nanometers, andwherein said surface is structurally different from said bulk portion and comprises a lamellar nanostructure or microstructure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification