BIOSENSOR SYSTEM FOR EXTERNAL ACTUATION OF MAGNETIC PARTICLES IN A BIOSENSOR CARTRIDGE

摘要

The invention provides for a biosensor system (1), wherein the system comprises a biosensor magnet assembly (10) with at least three electromagnetic subunits (20a, 20b, 20c). The magnetic field strength of each electromagnetic subunit is separately changeable by electrical control. Further, the system comprises a detachable biosensor cartridge (30) having a sensor surface and adapted to be arranged with the sensor surface adjacent to the biosensor magnet assembly (10). The invention further provides a method for steering the movement of magnetic particles in a biosensor cartridge (30). The method comprises the steps (a) and (b): in step (a), a sensor surface of a detachable biosensor cartridge (30) is arranged adjacent to a biosensor magnet assembly (10). The biosensor magnet assembly comprises three electromagnetic subunits (20a, 20b, 20c), wherein the magnetic field strength of each subunit is separately changeable by electrical control. In step (b), the magnetic field strength of each subunit is separately changed by electrical control to obtain a magnetic field gradient in the biosensor cartridge (30).