An electrostatic actuator array including a plurality of recesses within an actuator membrane and a method for forming same. Said cartridge is provided with a partition wall which separates a blood bag section positioned radially inside from a product section positioned radially outside, wherein a fixture for a filter is provided in the product section, a product transport path which leads from the blood bag section via the fixture for the filter to the product section. A connecting element or jumper includes a generally flat, elongated, resilient strip configured for developing an axial pushing force from end to end when flexed between the first attachment appliance and the second attachment appliance for moving the first teeth relative to the second teeth. The wheel assembly includes a plurality of wheels. The detectors further comprise at least one bank of filters, such as notch filters, corresponding to the number of possible relevant frequencies within the respective subbands. Active cooling of the heat sinks with water or air can further draw heat from the piezoelectric element.