Flexible Endoscopy Biopsies for Submucous Tumors With a New Drill Instrument

The purpose of this study is to determine whether the newly constructed CE (Conformité Européenne) marked drill biopsy instrument for flexible endoscopes can make possible representative biopsies of the increasing numbers of submucosal tumours in the gastrointestinal tract. The amount of submucous tissue ( micrograms and in % of all the biopsy) harvested with the new drill biopsy instrument used in flexible endoscopy investigations is measured in the study and compared to the amount of submucous tissue harvested with the existing biopsy forceps.