An esophageal overtube for use with an endoscope in which the overtube has a conduit for evacuation of laser smoke and burnt tissue which is created during esophageal tumor ablation with laser therapy. A vacuum port on the esophageal overtube facilitates connection to a vacuum source which evacuates...http://www.google.fr/patents/US5846182?utm_source=gb-gplus-shareBrevet US5846182 - Esophageal overtube for smoke evacuation
