Patent ID: 8558563
Filing Date: 2013-10-15
Classification: A61B

Abstract:
1. An apparatus comprising: a first electrode coupled to a surface of a material having a depth, the first electrode coupled to the surface of the material at a first location; a second electrode coupled to the surface of the material at a second location; a third electrode coupled to the surface of the material at a third location; the first location being further away from the third location than from the second location; the apparatus further comprising sensing electronics connected with the first electrode, the second electrode, and the third electrode; the sensing electronics disposed to measure, between the first and the second electrodes, a ratio of conductivity of a first region of the material at two differing frequencies; the sensing electronics disposed to measure, between the first and the third electrodes, a ratio of conductivity of a second region of the material at two differing frequencies; wherein the material is tissue perfused with blood, and wherein the second region is further in depth from the surface than the first region, and wherein the ratios of conductivity are indicative of blood/tissue ratios.