title: The toposcopic catheter and the fiberoptic pH probe--two medical instruments of potential use to gastroenterologists.
mesh_terms: D000818:Animals; D002404:Catheterization / Q000295:instrumentation*; D004285:Dogs; D005336:Fiber Optic Technology / Q000295:instrumentation*; D005767:Gastrointestinal Diseases; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008904:Miniaturization