Patent ID: 6440105
Filing Date: 2002-08-27
Classification: A61B,A61M

Abstract:
An ejection device for high-pressure ejection of a liquid or a liquid containing solid particles, comprising:a head unit; a pressure chamber which opens into a distal ejection opening and is delimited by a working piston which, upon application of an elastic impact on an end of the working piston facing away from the pressure chamber, is capable of transmitting a compression wave by which a pressure chamber-facing end of the working piston is displaceable into the pressure chamber so that the volume thereof is reduced, with the reduction in volume of the pressure chamber being significantly smaller than the volume of the pressure chamber; and a drive unit having a drive member, the drive member which is accelerated along an acceleration portion within the drive unit to generate an elastic impact to be transmitted to the working piston, characterized in that the pressure chamber is at least partially formed by a pressure cavity provided in the head unit, that the head unit and the drive unit are formed as separate, independent units which are mounted to each other by a separable mounting coupling, that an intermediary member is provided between the working piston and the acceleration portion as a separate component to transmit the elastic impact from the drive member to the working piston, the intermediary member being arranged in the drive unit of the device, and that the acceleration portion of the drive unit is tightly sealed towards the working piston by the intermediary member.