A pulse oximeter sensor having an emitter(s) and a detector, with a layer having a first portion of the emitter and a second portion of layer over the detector is provided. A barrier is included between the first and second portions of the overlying layer to substantially block radiation of the wavelengths...http://www.google.com.au/patents/US6430423?utm_source=gb-gplus-sharePatent US6430423 - Shunt barrier in pulse oximeter sensor
