Patent ID: 7756564
Filing Date: 2010-07-13
Classification: A61B,G01R

Abstract:
1. A magnetoencephalography apparatus comprising: a hollow, vacuum structure for thermal insulation which has two cylinders—the first cylinder of high critical temperature superconductor material and the second cylinder of high permeability magnetic material both contained therein; a closed-cycle coolant refrigerator to circulate a given coolant in a pipe welded to the outside wall of the first cylinder in the vacuum structure for thermal insulation; a coolant dewar fixedly arranged in the vacuum structure for thermal insulation; a plurality of SQUID magnetic sensors fixedly arranged in the coolant dewar; a top cover of a magnetic material to cover the top of the vacuum structure for thermal insulation, said SQUID magnetic sensors being arranged in the coolant dewar around a head-accommodating area, which is defined at the lower part of the coolant dewar; and a superconducting canopy arranged above the magnetic sensors in the coolant dewar, characterized in that the apparatus further comprises fastening means for preventing any relative displacement between the magnetic sensors and the first cylinder of high critical temperature superconductor material, the fastening means to assure that the magnetic sensors be prevented from traversing across stationary magnetic fluxes trapped in the inner space of the vacuum structure for thermal insulation, the fastening means comprising a first pillow structure to fill a gap between the inner wall of the vacuum structure for thermal insulation and the outer wall of the coolant dewar, the fastening means further comprising a second pillow structure to fill a gap between the superconducting canopy and the inner wall of the coolant dewar, the second pillow structure being placed next to the lowest end of the coolant dewar.