Patent ID: 8052703

Claim:
A medical device, comprising: an elongated catheter configured to be inserted into a body; an inflatable balloon attached to the catheter; and a cutting element carried by the balloon, the cutting element comprising an alloy having a nickel equivalent and a chromium equivalent within a first area of a Schaeffler diagram, the first area being defined by 12 equivalent chromium-zero equivalent nickel, 12 equivalent chromium-15.5 equivalent nickel, and 26 equivalent chromium-4.5 equivalent nickel, wherein a chromium equivalent is equal to % Cr+% Mo+1.5×% Si+0.5×% Nb, a nickel equivalent is equal to % Ni+30×% C+0.5×% Mn, and the alloy comprising at least two phases, one of the phases being a martensitic phase; wherein the alloy comprises from about 0.35% to about 0.65% by weight of carbon; wherein the alloy comprises from about 12% to about 16% by weight of chromium, from about 0.5% to about 5% by weight of molybdenum, and iron.