Patent ID: 7741129

Claim:
A method for treating magnetic particles present in solution in a vessel, wherein the magnetic particles are capable of being associated with biological entities, the method comprising: a) subjecting the magnetic particles to a constant magnetic field in the form of magnetisation that is a function of T and D, wherein: the magnetisation is generated by a magnetisation source; T is a magnetic induction of the magnetisation source, expressed in milliTesla (mT), D is the distance separating the magnetisation source from the bottom of the vessel, expressed in millimeters (mm), wherein T is between 5 and 400mT and D is less than or equal to 50mm, and wherein the magnetisation disposes the magnetic particles in filaments that are oriented along the north-south axis of the magnetisation source, b) moving the magnetisation source or the vessel or both, while maintaining magnetisation on the magnetic particles, and c) suppressing magnetisation on the magnetic particles by moving the magnetisation source or the vessel or both, or by stopping the magnetisation source.