Patent ID: 6595915
Filing Date: 2003-07-22
Classification: A61B

Abstract:
A jet nozzle connected to a distal end of an axial wash fluid passage in an endoscopic insertion instrument for spurting a wash fluid toward and on an observation window of an optical image pickup system fitted in a tip end section of said endoscopic insertion instrument, said jet nozzle comprising:a wash fluid inlet passage provided in an axial bore formed axially through said tip end section in a direction of an optical axis of said optical image pickup system and opened in a circular end face of said tip end section; and a nozzle tip portion having a jet spout passage portion and a curved turn passage portion, wherein: said jet spout passage portion is extending along a distal end face of said tip end section and provided with a flat flow rectifying passage; and said curved turn passage portion is connecting said wash fluid inlet passage and said jet spout passage portion to turn a flow passage of said wash fluid from said axial wash fluid passage to said jet spout passage portion and bent such that a center line of said flow rectifying passage is brought into alignment with a center of said observation window.