A method for preparing a foamed sclerosant composition. One method includes introducing a liquid sclerosant composition into a foaming space of an interior of a container, the foaming space containing a mixing component having a magnetic part. Rotation of the mixing component is achieved by generating for a first holding time a rotating magnetic field at a first speed and after the first holding time generating for a second holding time the rotating magnetic field at a second speed greater than the first speed.

An aerator mixing rod includes a body having a first end, a second end opposite the first end, an outer surface, and a plurality of teeth extending radially outward from the outer surface. The teeth include a first row of teeth and a second row of teeth spaced from the first row of teeth along a longitudinal axis of the body. A first passageway is formed between adjacent teeth of the first row of teeth, and a second passageway is formed between adjacent teeth of the second row of teeth. The first passageway is at least partially misaligned with the second passageway in a direction parallel to the longitudinal axis to at least partially form a tortuous path for fluid flowing along the outer surface of the body. The aerator mixing rod is formed from an injection-moldable material by an injection molding process.

The present disclosure relates to an extrusion apparatus comprising: a) a planetary roller extruder; b) a melt pump arranged downstream of the extruder; c) optionally, a fluid feeding equipment; d) a static cooling mixer equipment arranged downstream of the melt pump; e) a foaming equipment arranged downstream of the static cooling mixer equipment. The present disclosure also relates to a process of manufacturing a foamed polymeric composition and uses thereof.