Patent ID: 7794493
Filing Date: 2010-09-14
Classification: A61L

Abstract:
1. An implantable medical device being formed from an improved, magnetic resonance compatible low iron, cobalt chromium, solid-solution alloy comprising chromium in the range from about 19 weight percent to about 21 weight percent, tungsten in the range from about 14 weight percent to about 16 weight percent, nickel in the range from about 9 weight percent to about 11 weight percent, manganese in the range from about 1 weight percent to about 2 weight percent, carbon in the range from about 0.05 weight percent to about 0.15 weight percent, iron in an amount not to exceed 0.3 weight percent, silicon in an amount not to exceed 0.4 weight percent, phosphorus in an amount not to exceed 0.04 weight percent, sulfur in an amount not to exceed 0.03 weight percent and the remainder cobalt, the solid solution alloy being formed into a small diameter, thin-walled tube and machined into a lattice of interconnected elements each having a length, a width and a thickness defined as the distance between the inner and outer surfaces of the thin-walled tube, and wherein at least one of the elements at the end of the device having a width greater than the width of the elements at the center of the device.