Magnetic core flux canceling of ferrites in MRI
US8311637B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 6, 2009 |
| Grant date | Nov 13, 2012 |
| Priority date | — |
| Expiry date | Feb 24, 2031 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N2/002
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A magnetic core flux canceling device according to embodiments of the present invention includes a magnetic field sensor adapted for placement at a ferrite material core in an implantable medical device, the magnetic field sensor adapted to transmit a signal corresponding to a magnitude of a first magnetic field. Such a device may also include a coil disposed around the ferrite material core and a driver circuit configured to receive the signal and to vary a voltage applied across the coil based on the signal, the voltage applied across the coil creating a second magnetic field at least partially in a direction opposite the first magnetic field. According to some embodiments of the present invention, multiple coils may be used to cancel magnetic fields in multiple directions. A voltage applied across the coil varies in magnitude and/or direction to cancel or weaken an MRI-related magnetic field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.