Abstract: A spray device used for an endoscope, the spray device having a liquid transfer tube and a spray nozzle connected to a distal end of the liquid transfer tube, includes at least one spiral guide channel; a liquid whirling chamber positioned in front of at least one spiral guide channel to be connected to an outlet thereof; and an orifice formed at a center of a front inner surface of the liquid whirling chamber. The front inner surface includes a concave surface, and the concave surface is formed so that the orientation of a tangential plane at a point on the front inner surface becomes closer to the orientation of a plane normal to the axis of the spray nozzle as the point on the front inner surface approaches the axis of the spray nozzle.

Abstract: In an endoscopic spraying instrument, liquid passed through a liquid supplying tube and a rotatingly guiding groove disposed at a leading end side of the supplying tube is rotated about an central axis within a liquid rotating chamber disposed at a leading end side of the rotatingly guiding groove and discharged forwardly from an ejection hole formed in a leading end wall of the liquid rotating chamber. An annular, protruded wall, is provided, which is spaced outwardly from an outer periphery of the ejection hole, which is protruded forwardly, and which surrounds an exit of the ejection hole.