The present invention teaches a method and a system for ambulatory recording of the pH and the presence of various materials in compartments of the gastro-intestinal tract. The invention also reports the pH pattern in relation to the prevalence of the materials, and analyses to which degree such materials...http://www.google.com.tw/patents/US5438985?utm_source=gb-gplus-share專利 US5438985 - Ambulatory recording of the presence and activity of substances in gastro-intestinal compartments
