An endoscopic method utilizes a substantially thin-walled elongate tubular sheath including an annular inflatable balloon, the sheath having a use configuration with an inner diameter larger than an outer diameter of an insertion member of an endoscope, whereby the sheath may be removably disposed about...http://www.google.es/patents/US5353783?utm_source=gb-gplus-sharePatente US5353783 - Endoscopic method using sheath
