Patent ID: 9103824
Filing Date: 2015-08-11
Classification: G01N

Abstract:
1. A biosensor system, comprising: a biosensor cartridge; a first biosensor magnet assembly for generating a first magnetic field in the biosensor cartridge comprising two magnetic subunits each having a core with a top surface separated by a gap, the core tapering in the direction of the biosensor cartridge and having an incline section inclined by 120° to 150° with reference to the perpendicular of the sensor surface of the biosensor cartridge; and wherein a sensor surface comprised by the biosensor cartridge is arranged above the top surfaces of the cores, wherein the two subunits are adapted to generate the first magnetic field between the first subunit and the second subunit with first magnetic field lines essentially in parallel to the sensor surface to exert forces at magnetic particles in the cartridge; wherein a second biosensor magnet assembly is arranged above the sensor surface for generating a second magnetic field and exerting a force on magnetic particles in the cartridge; control means for separately controlling the second magnetic field by electrically driving at least one of the second biosensor magnet assembly and the two magnetic subunits; wherein the control means causes the second magnetic field to include second magnetic field lines directed nearly perpendicular to the sensor surface, the second magnetic field lines acting as magnetic walls which block the magnetic particles from translating in a direction nearly in parallel to the sensor surface.