Alloy compositions and devices including the compositions

Abstract

Alloy compositions, including devices and instruments that include the compositions, are disclosed. The compositions have high hardness, strength, corrosion resistance, and biocompatibility. The compositions can be used to manufacture, for example, medical devices and products.

1 . A medical device, comprising:
 an alloy comprising:
 from about 3 to about 22 weight percent of chromium; 
 less than about 4 weight percent of molybdenum; 
 iron; and 
   greater than about 50 weight percent of one or more first elements selected from the group consisting of platinum, palladium, iridium, rhodium, gold, silver, and lead.   
     
     
         2 . The device of  claim 1 , wherein the alloy comprises greater than about 60 weight percent of the first elements. 
     
     
         3 . The device of  claim 1 , wherein the alloy comprises greater than about 70 weight percent of the first elements. 
     
     
         4 . The device of  claim 1 , wherein the alloy further comprises nickel. 
     
     
         5 . The device of  claim 4 , wherein the alloy comprises less than about 6 weight percent of nickel. 
     
     
         6 . The device of  claim 1 , wherein the alloy further comprises copper, manganese, nickel, phosphorus, silicon, nitrogen, sulfur, and carbon. 
     
     
         7 . The device of  claim 1 , wherein the alloy comprises less than about 25 weight percent of iron. 
     
     
         8 . The device of  claim 1 , wherein the alloy comprises between 7.395 and 25 weight percent of iron. 
     
     
         9 . The device of  claim 1 , wherein the alloy is substantially fully martensitic. 
     
     
         10 . The device of  claim 1 , wherein the alloy is at least about 50% martensitic. 
     
     
         11 . The device of  claim 1 , wherein the alloy is at least about 90% martensitic. 
     
     
         12 . device of  claim 1 , wherein the alloy has a pitting resistance equivalent of greater than about 26. 
     
     
         13 . The device of  claim 1 , wherein the alloy has a hardness of greater than about 24 HRC. 
     
     
         14 . The device of  claim 1 , wherein the alloy has a tensile strength of greater than about an ultimate tensile strength of 140 ksi. 
     
     
         15 . The device of  claim 1 , wherein the alloy has a density of greater than about 11 g/cc. 
     
     
         16 . The device of  claim 1 , wherein the device is adapted to be implanted in a body. 
     
     
         17 . The device of  claim 1 , wherein the device is in the form of a balloon catheter comprising a cutting element comprising the alloy. 
     
     
         18 . A medical device comprising:
 an alloy comprising:
 less than about 22 weight percent of chromium; 
 from about 1 to about 4 weight percent of molybdenum; 
 iron; and 
 greater than about 50 weight percent of one or more first elements selected from the group consisting of platinum, palladium, iridium, rhodium, gold, silver, and lead. 
   
     
     
         19 . The device of  claim 18 , wherein the alloy comprises from about 3 to about 22 weight percent of chromium. 
     
     
         20 . A medical device, comprising
 an alloy comprising a stainless steel and greater than about 50% by weight of one or more first elements selected from the group consisting of platinum, palladium, iridium, rhodium, gold, silver, and lead.