RF-safe invasive device
US6496714B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2001 |
| Grant date | Dec 17, 2002 |
| Priority date | — |
| Expiry date | Jul 20, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/285
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention sets forth an RF-safe invasive device which is intended to cooperate with a magnetic resonance imaging apparatus and which contains at least one long conductor for a specific purpose, e.g., the localization of the RF-safe device in an object under test. It is known that in such devices with long conductors during RF transmission of the magnetic resonance apparatus a standing RF wave along the conductors may build up which causes dangerous heating of the device and surrounding tissue. It is the object of the invention to provide a construction applicable to such devices such that the heating of the conductor and surrounding tissue is avoided. The RF-safe invasive device is therefore provided with at least one series element of controllable impedance incorporated into the long conductor where the impedance of the series element is controlled by a control unit such that during RF transmission the series elements subdivide the long conductor into sections substantially shorter than half the wavelength in tissue of the RF used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.