A device is provided for assessing impairment of blood circulation in a patient, such as that in perfusion failure, by measurement of blood flow adjacent a mucosal surface accessible by a mouth or nose and connecting with the gastrointestinal tract or upper respiratory/digestive tract of a patient. The...http://www.google.de/patents/US7618376?utm_source=gb-gplus-sharePatent US7618376 - Device for assessing perfusion failure in a patient by measurement of blood flow
