The invention discloses an
insertion part of a transnasal
endoscope and the transnasal
endoscope, and relates to the technical field of
medical instruments.The
insertion part of the transnasal
endoscope comprises a head end part, a bent part and an
insertion tube
assembly, and the end face of the far end of the head end part is provided with a steam
nozzle, an image transmission objective lens window, an illumination window, an auxiliary
water supply outlet and an instrument channel outlet; an image transmission board card is arranged in the head end part, an electronic wire harness, a
water vapor pipeline, a
light guide assembly, an instrument channel pipeline and an auxiliary
water supply pipeline are arranged in the bending part and the insertion
pipe assembly in a penetrating manner, and the diameters of the electronic wire harness and the instrument channel pipeline are larger than those of the
water vapor pipeline, the
light guide assembly and the auxiliary
water supply pipeline; the distance between the connecting line of the center of the instrument channel pipeline and the center of the electronic wire harness and the center of the head end part, the bending part or the insertion
pipe assembly is 0-1 mm, and the steam pipeline and the auxiliary water supply pipeline are located on the two sides of the connecting line of the center of the instrument channel pipeline and the center of the electronic wire harness respectively. The
nasal endoscope has the auxiliary water supply function, and water supply is stable.