Patent ID: 8235579

Claim:
Device for introducing ultrasound into a flowable medium via a sonotrode, comprising a sonotrode, a flow cell for containing a flowable medium, a foil arranged between the sonotrode and the flow cell in such a way that, in a non-operating state, the foil is located spaced apart from the sonotrode with a gap of up to 100 μm, the foil being arranged so as to prevent contact between the sonotrode and a flowable medium in the flow cell, a seal located between a second side of the foil facing away from the sonotrode and the flow cell, which seals the flow cell within the device, a tensile means for exerting a pressing force against the sonotrode by way of the foil, such that during operation of the device, the pressing force is maintained sufficiently large so that the foil contacts the sonotrode and follows the stroke motion thereof to thereby transfer ultrasound to the flowable medium during operation of the device, a means for reducing pressure with respect to a space formed on a first side of the foil facing the sonotrode, a liquid residing within the gap, said liquid contacting the first side of the foil, said liquid being chosen from the group consisting of an oil, an artificial resin and a silicone compound, and a transport means for continuously or discontinuously advancing the foil with respect to the sonotrode during operation of the device.