Generating Pressure Fluctuations In A Line

A pressure modulator (24) having an outlet opening (26), which can be connected to a line (2) through which fluid (8) is flowing such that the outlet opening forms its exit end for the fluid (8), wherein the outlet opening (26) empties into a clearance (28), so that the fluid (8) during operation forms a fluid jet (30) emerging from the outlet opening (26) into the clearance (28) along a fluid path (32), and having an impact body (34) which can be introduced into the fluid path (32) in different ways, dynamically over time, forming at least some of the time an impact surface (36,36a-d), on which at least a portion of the fluid jet (30) impinges during operation.

A pipeline arrangement (12) comprising:

• a line (2) having an inlet (4) and an outlet (6) for the flow of a fluid (8) through the line (2) from the inlet (4) to the outlet (6), the pipeline arrangement (12) being part of a test layout (17) for a medical stent (18) with a test section (20) of the line (2) in which the stent (18) is placed, the line (2) able to be expanded by a pressure fluctuation (Δp) in the form of an increase in the pressure (p) of the fluid (8),
• a delivery mechanism (14) for the fluid (8), in order to deliver the fluid (8) at the inlet (4) at a constant rate to the inlet (4) of the line (2),
• a throttle element (16) for the fluid (8), in order to throttle the volume flow of the fluid (8) emerging from the outlet (6) to different degrees dynamically over time, especially periodically, in order to create dynamic pressure fluctuations (Δp) of the fluid (8) upstream in the line (2) by the change in the throttling.