Patent ID: 7938772

Claim:
An insertion apparatus, comprising: an introducing duct, including: an insertion portion cover portion for covering in a water-tight manner from an end surface of an insertion portion extending from a distal side portion of a handling portion constituting an endoscope to a crack stop constituting the distal end side of the handling portion, the insertion portion including a closing window portion at an end surface thereof for performing endoscopy of an examinee's body, the insertion portion cover portion being adapted to rotate around an axis of the insertion portion; and a spiral duct integrally fixed on an outer circumferential surface side of the insertion portion cover portion, the spiral duct having, on a circumferential surface of the spiral duct, a propulsion power generating portion which is rotated to cause an outer surface thereof to contact a part to be examined, for applying a propulsion power for introducing the insertion portion covered by the insertion portion cover portion into a deep portion in a body cavity; and a rotating device comprising a rotating portion for rotating the introducing duct, wherein the insertion portion cover portion comprises: a distal portion body, having a cylindrical shape, comprising a closing window portion and an aperture side in which one end of the spiral duct is placed, the distal portion body being disposed to cover a distal portion constituting the insertion portion; a proximal portion body having a cylindrical shape and in which another end of the spiral duct is disposed, the proximal portion body being disposed at the distal side portion of the handling portion; and a flexible tubular cover member made of resin whose ends are disposed in a water-tight manner with respect to the distal portion body and the proximal portion body.