Microfluidic device and method with trapping of sample in cavities having lids that can be opened or closed

摘要

Method and arrangement ( 10, 20 ) for preparing samples ( 15, 27 ) submergible in a liquid medium. The arrangement includes a carrier structure ( 11 ). The carrier includes a device ( 13, 23 ) for controllable generation of a magnetic field through influence of a control signal to attract at least part of the at least first and second type of samples ( 15, 27 ) towards specific locations on the carrier when connected to a first control signal and to repel at least one of the first or second type of samples when connected to a second control signal.