Extremely high density barium suspension as a contrast medium for upper gastrointestinal examination

摘要

To provide a barium powder preparation and application thereof to an extremely high density barium suspension, processes for producing them, and a method of upper gastrointestinal examination, wherein double contrast radiography can be carried out on-the-fly without the use of a gastric tube and the injection of any parasympathicolytic, only by one slow rolling operation with the patient on the table. A barium powder preparation obtained by mixing specified proportions of large, medium and small component particles which are produced from large, medium and small particles of pure barium sulfate having specific particle properties, by adding Gum Tragacanth and Carrageenan in specified amounts and at a specified ratio, kneading their mixture under specified kneading conditions to fragment the molecules of Gum Tragacanth and Carrageenan and coat the particles with them, and drying and sterilizing the particles, and a barium suspension prepared by suspending the above barium powder preparation in water at an extremely high density are used.