#$%^&*AU2012254904B220151029.pdf#####ABSTRACT Devices, systems and methods are disclosed for determining the composition of a plaque at a plaque site, which could be inside a blood vessel. Through a combination of fluid Injectlon with different conductivities and measurement of the resultant conductances, a parallel tissue conductance measure is obtained that assists In determining the composition of the site plaque. Lower parallel conductance levels are determinative of a higher lipid and/or fatty plaque, which Is a type that may break out of its position and cause organ injury or death.6/8 F43 6l 26 42 P:la D E I E90D E Figure 6