Patent ID: 6203521
Filing Date: 2001-03-20
Classification: A61M

Abstract:
An ejection device (1) for the high-pressure ejection of a liquid or a liquid containing solid particles, comprising a pressure chamber (13) wherein the liquid is received, which opens into an ejection opening (11) and is delimited by a working piston (5) which, upon application of an impact on its end facing away from the pressure chamber, is capable of transmitting a compression wave by which at least the pressure chamber-facing end of the working piston (5) is displaceable by a predetermined displacement stroke into the pressure chamber (13) so that the volume thereof is reduced, with the reduction in volume of the pressure chamber (13) being significantly smaller than the volume of the pressure chamber (13); and a drive member (24) which is capable of generating the impact, characterized in that the working piston (5) is progressively displaced into the pressure chamber (13) by the repeated application of impacts, with the distance of each single displacement being defined by the predetermined displacement stroke.