A pulse oximeter sensor comprising an emitter and a detector disposed on a substrate layer with a thinned portion between the emitter and the detector. A partially transparent covering layer covers the substrate layer and comprises a corresponding thinned portion. The thinned portions attenuate light...http://www.google.com/patents/US7373191?utm_source=gb-gplus-sharePatent US7373191 - Shunt barrier in pulse oximeter sensor
