An oximeter probe to be wound on a fingertip of an object and used to measure the oxygen saturation of blood is completely shielded from electrical noises. The front face of an a flexible printed circuit board on which an a light-emitting device and a photodetective are mounted is covered by a conductive...http://www.google.com.au/patents/US5520177?utm_source=gb-gplus-sharePatent US5520177 - Oximeter probe
