US Patent 8156900 Animal claw live tissue sensing method and apparatus

An electronic method and apparatus to externally sense and identify the position of live tissue within an animal claw, including opaque claws. The live tissue (quick) position is determined by electrical conductivity measurements along the claw, so that the claw can be cut or marked. A receptor electrode positioned on the claw measures conductivity resulting from either a source electrode placed on the animal, or from the electro-magnet field created by the ambient presence of radiated line voltage. A multi point contact electrode which does not require calibration, comprises alternating hydrophilic and hydrophobic sections. A claw receptacle conforms the electrode to the claw.