Abstract: A channel system for use with a conventional endoscope is provided. The system comprises a collapsible access channel that is connected to a first distal end of the endoscope. The collapsible channel includes an access opening communicating between the two ends of the collapsible channel. The endoscope may be provided with a protective sheath and/or an endcap that is integral with the collapsible channel. The collapsible access channel allows a physician to insert functional instruments such as a biopsy device or tubes for supplying air, water, suction and irrigation.

Abstract: A protective covering for a medical instrument, such as an endoscope, is described. The covering includes an elongated hollow sheath having a wall of flexible material. The sheath is substantially gas and water impervious. The sheath further includes auxiliary access tubes associated with the sheath for providing a variety of functions, such as instrument manipulation, and fluid removal. The distal end of the sheath is provided with a cap having an optically clear window to allow the lens portion of the medical instrument to operate.

Abstract: A protective covering for a medical instrument, such as an endoscope, is described. The covering includes an elongated hollow sheath having a wall of flexible material. The sheath is substantially gas and water impervious and includes a channel for the medical instrument. The sheath further includes auxiliary access channels associated with the sheath for providing a variety of functions, such as instrument manipulation, and fluid removal. The distal end of the protective covering is provided with a cap having an optically clear window to the allow the lens portion of the medical instrument to operate.