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System and Method for Monitoring and Controlling Radio Frequency Signals in Interventional Devices

Posted Mar 03 2011 7:00pm

Description of Invention:
The invention offered for licensing and commercial development is in the field of Interventional Magnetic Resonance Imaging (“iMRI”). More specifically the invention discloses interventional devices in which the heat generated at the device during the imaging process can be controlled to not exceed acceptable levels.

Interventional devices may heat up significantly during an interventional MRI procedure as a result of an RF induced current on the device. The RF induced current is caused by the coupling between the interventional device and RF electrical fields generated by the MRI. As the magnitude of the induced RF signal increases, the amount of heat that is generated also increases. The system of the present invention measures the induced RF signal and changes a decoupling capacitor value by using a varactor and a control circuit to adjust the impedance of the device and thus controls the magnitude of the RF signal. This unique design renders the device and the procedures done with it safe.

  • Interventional cardiology
  • MRI guided surgery

The device may fundamentally enable any "active" MRI catheter device to be safe during real-time MRI guided interventional procedures. Automated feedback loops between RF power applied by the MRI scanner and measured power detected inside the MRI catheter coil can be used to assure safety of "active" MRI catheter devices.

Development Status:
In development. Prototype is being built.

Ozgur Kocaturk (NHLBI)
Merdim Sonmez (NHLBI)

Patent Status:
HHS, Reference No. E-034-2011/0
US, Application No. 61/430,311 filed 06 Jan 2011

Relevant Publication:
  1. Overall WR, Pauly JM, Stang PP, Scott GC. Ensuring safety of implanted devices under MRI using reversed RF polarization. Magn Reson Med. 2010 Sep;64(3):823-833. [ PubMed: 20593374 ]

Licensing Status:
Available for licensing.

Collaborative Research Opportunity:
The National Heart, Lung, and Blood Institute is seeking statements of capability or interest from parties interested in collaborative research to further develop, evaluate, or commercialize safety interventional devices during iMRI procedures. Please contact Peg Koelble at for more information.

Devices/Instrumentation - Diagnostics

For Licensing Information Please Contact:
Michael Shmilovich Esq.
NIH Office of Technology Transfer
6011 Executive Blvd. Suite 325,
Rockville, MD 20852
United States
Phone: 301-435-5019
Fax: 301-402-0220

Ref No: 2232

Updated: 03/2011

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