Research Papers

Developing a Magnetic Resonance-Compatible Catheter for Cardiac Catheterization

[+] Author and Article Information
Wei Yao

Research Associate
Division of Engineering,
King's College London,
Strand, London WC2R 2LS, UK
e-mail: yao.wei@kcl.ac.uk

Tobias Schaeffter

Division of Imaging Sciences
and Biomedical Engineering,
King's College London,
St. Thomas's Hospital,
London SE1 7EH, UK
e-mail: tobias.schaeffter@kcl.ac.uk

Lakmal Seneviratne

Division of Engineering,
King's College London,
Strand, London WC2R 2LS, UK;
Khalifa University of Science,
Technology and Research,
P.O. Box 127788,
Abu Dhabi, United Arab Emirates
e-mail: lakmal.seneviratne@kcl.ac.uk;

Kaspar Althoefer

Department of Informatics,
King's College London,
Strand, London WC2R 2LS, UK
e-mail: k.althoefer@kcl.ac.uk

Manuscript received July 11, 2011; final manuscript received May 22, 2012; published online October 11, 2012. Assoc. Editor: James Moore.

J. Med. Devices 6(4), 041002 (Oct 11, 2012) (7 pages) doi:10.1115/1.4007281 History: Received July 11, 2011; Revised May 22, 2012

Magnetic Resonance Imaging (MRI) is a means to guide cardiac interventions and provide excellent soft tissue contrast while avoiding radiation hazards. This paper investigates and evaluates a new Magnetic Resonance (MR)-compatible catheter for cardiac catheterization. Important mechanical properties of the catheter are measured and investigated; these include flexibility, pushability, and torquability. The mechanical performance of the MR-compatible and steerable catheter is benchmarked against three commercially-available clinical ablation catheters that are not MR-compatible. The MR-compatibility of the proposed catheter is also evaluated through an experimental study inside a 1.5 T MRI scanner. The new catheter is shown to have a mechanical performance comparable to that of existing catheters while being MR compatible.

© 2012 by ASME
Topics: Catheters
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Fig. 1

Design of an MR-compatible catheter

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Fig. 2

The deflectable tip of the MR-compatible catheter

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Fig. 3

Prototype of the MR-compatible catheter

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Fig. 4

Catheters used for benchmarking

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Fig. 5

Test rig for flexibility measurement of catheter shafts

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Fig. 6

Force versus displacement of catheter shafts

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Fig. 7

The test rig for pushability measurement of the catheter shafts

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Fig. 8

Force versus displacement of the catheter shafts

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Fig. 9

The test rig for the torsional rigidity measurement of the catheter shafts

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Fig. 10

Torque versus angle of twist of the catheter shafts

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Fig. 11

The catheter inside the 1.5 T Philips MRI scanner

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Fig. 12

Real time scan of the catheter prototype in a 1.5 T MRI scanner

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Fig. 13

Phase mapping of the catheter prototype




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