Device for modification/selective destruction of organic tissues, and use thereof for biomedical uses comprising a magnetic field generator (1) incorporated in a faraday box (6), with coils/conductors and device for controlling the electrical parameters of intensity and terminal voltage (7). This generator consisting of a device generating chaotic magnetic fields (1) with coils/conductors whose geometric configuration (figure 1) generates lines of chaotic magnetic fields, topologically characterized in space by chaotic field lines, which surround the field lines magnetic cells confined to a toroid or magnetic kam island (2), topologically controlled structure in space, being confined to the faraday cage (6). In addition, it also comprises one or more devices generating polarized electromagnetic frequencies (infrared, microwave or x-rays) (3, 3.1, 3.2) with focusing capacity (4), coherence with the resonant frequency and polarization in the direction of maximum absorbance of the nanoparticles/oriented biomolecules on the kam island (2) that will submerge the target tissue for selective modification or destruction. That can operate at the frequency of x-rays with/without the use of nanoparticles/biomolecules, in this case the destruction of the target tissue (4), will be produced by the control in the direction of the trajectories of secondary electrons and other particles charged, produced by the x-ray beam, in the target tissue (4), by modulating the magnetic field strength of the magnetic kam island (2) in the target tissue (4), and the direction of incidence of the magnetic kam island with respect to the x-ray beam, in the target tissue (4). (Machine-translation by Google Translate, not legally binding)Dispositivo de modificación/destrucción selectiva de tejidos orgánicos, y utilización del mismo para usos biomédicos que comprende un generador de campos magnéticos (1) incorporado en una caja de Faraday (6), con bobinas/conductores y dispositivo de control de los p