Patent ID: 8626259

Claim:
A biomedical sensor providing at least first, second and third electrical nodes for connection to medical equipment, said biomedical sensor comprising a plurality of protruding electrodes that extend from a common base, at least one of said protruding electrodes being coupled to the first electrical node, and at least two of said protruding electrodes being coupled to the second electrical node, at least one of said plurality of protruding electrodes being adjustable in length such that each of said plurality of protruding electrodes is adapted to contact a non-planar surface of a subject, said second and third electrical nodes being arranged in a functionally polar configuration to facilitate the determination of Laplacian voltage potentials Δν 0 at the first electrical node, wherein said third electrical node is provided by an outermost ring of conductors having a radius r that is employed to sense an outer region so as to provide a shielding function that prioritizes only signals below the biomedical sensor, wherein the shielding function is provided by using the approximation Δ ⁢ ⁢ v 0 ≅ 1 3 ⁢ r 2 ⁢ { 16 ⁢ ( v Second ⁢ ⁢ node - v First ⁢ ⁢ node ) - ( v Third ⁢ ⁢ node - v First ⁢ ⁢ node ) } where ν First node represents the voltage potential at the first electrical node, ν Second node represents the voltage potential at the second electrical node, and ν Third node represents the voltage potential at the third electrical node.