Patent ID: 8052627

Claim:
A spray nozzle for a mouth rinse, the spray nozzle comprising: a nozzle member; a nozzle attachment couple to the nozzle member to define an axially extending chamber; a liquid duct configured to supply pressurized liquid to the chamber; a pressure piece disposed within the chamber; a whirl chamber connected to the chamber, the whirl chamber being configured to create a circulating flow of the liquid; and a nozzle outlet formed in the nozzle attachment and extending centrally from the whirl chamber and configured to discharge a cleaning jet, the nozzle outlet comprising a substantially cylindrical narrow passage; wherein a first end of the pressure piece comprises a cup-shaped portion having grooves extending from the chamber to openings; wherein a second end of the pressure piece, opposite the first end, comprises a second cup-shaped portion including an interior space in fluid communication with the liquid duct as well as with the chamber; wherein the interior space of the second end of the pressure piece communicates with the chamber through at least one opening which is constructed as an axial slit; and wherein a plurality of axial slits along the second end of the pressure piece define a plurality of spring arms to axially and resiliently secure the pressure piece in the chamber.