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Related Experiment Video

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Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging
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Published on: April 4, 2013

Steerable catheter microcoils for interventional MRI reducing resistive heating.

Anthony Bernhardt1, Mark W Wilson, Fabio Settecase

  • 1Lawrence Livermore National Laboratory, Livermore, CA, USA.

Academic Radiology
|November 16, 2010
PubMed
Summary
This summary is machine-generated.

Alumina-tipped catheters effectively dissipate resistive heating from microwires during interventional magnetic resonance imaging. This study demonstrates improved heat transfer, crucial for safe remote catheter steering in medical procedures.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Materials Science

Background:

  • Remote catheter steering is essential for interventional magnetic resonance imaging (iMRI).
  • Microwire resistive heating poses a safety concern during iMRI procedures.
  • Efficient heat dissipation is critical for preventing thermal injury.

Purpose of the Study:

  • To evaluate resistive heating of microwires used in iMRI catheter steering.
  • To investigate alumina's efficacy in enhancing heat transfer to catheter lumen saline.
  • To assess the safety of alumina-tipped catheters in vivo.

Main Methods:

  • Fabrication of microcoils on polyimide- and alumina-tipped catheters.
  • In vitro testing using a 1.5-T MRI system and vessel phantom.
  • Measurement of resistive heating with varying flow rates; preliminary in vivo porcine carotid artery testing.

Main Results:

  • Polyimide-tipped catheters showed significant temperature increases (up to 23°C/W).
  • Alumina-tipped catheters demonstrated substantially lower effluent temperature rise (2.3°C/W at lowest flow).
  • In vivo tests confirmed no thermal injury to vessel walls.

Conclusions:

  • Alumina-tipped catheters effectively dissipate microwire resistive heating via saline coolant.
  • This facilitates safer remote catheter steering in iMRI.
  • Alumina enhances heat transfer, mitigating risks associated with interventional procedures.