PURPOSE: To evaluate deflection capability of a prototype endovascular catheter, which is remotely magnetically steerable, for use in the interventional magnetic resonance (MR) imaging environment. MATERIALS AND METHODS: Copper coils were mounted on the tips of commercially available 2.3-3.0-F microcatheters. The coils were fabricated in a novel manner by plasma vapor deposition of a copper layer followed by laser lithography of the layer into coils. Orthogonal helical (ie, solenoid) and saddle-shaped (ie, Helmholtz) coils were mounted on a single catheter tip. Microcatheters were tested in water bath phantoms in a 1.5-T clinical MR scanner, with variable simultaneous currents applied to the coils. Catheter tip deflection was imaged in the axial plane by using a "real-time" steady-state free precession MR imaging sequence. Degree of deflection and catheter tip orientation were measured for each current application. RESULTS: The catheter tip was clearly visible in the longitudinal and axial planes. Magnetic field artifacts were visible when the orthogonal coils at the catheter tip were energized. Variable amounts of current applied to a single coil demonstrated consistent catheter deflection in all water bath experiments. Changing current polarity reversed the observed direction of deflection, whereas current applied to two different coils resulted in deflection represented by the composite vector of individual coil activations. Microcatheter navigation through the vascular phantom was successful through control of applied current to one or more coils. CONCLUSIONS: Controlled catheter deflection is possible with laser lithographed multiaxis coil-tipped catheters in the MR imaging environment.
PURPOSE: To evaluate deflection capability of a prototype endovascular catheter, which is remotely magnetically steerable, for use in the interventional magnetic resonance (MR) imaging environment. MATERIALS AND METHODS:Copper coils were mounted on the tips of commercially available 2.3-3.0-F microcatheters. The coils were fabricated in a novel manner by plasma vapor deposition of a copper layer followed by laser lithography of the layer into coils. Orthogonal helical (ie, solenoid) and saddle-shaped (ie, Helmholtz) coils were mounted on a single catheter tip. Microcatheters were tested in water bath phantoms in a 1.5-T clinical MR scanner, with variable simultaneous currents applied to the coils. Catheter tip deflection was imaged in the axial plane by using a "real-time" steady-state free precession MR imaging sequence. Degree of deflection and catheter tip orientation were measured for each current application. RESULTS: The catheter tip was clearly visible in the longitudinal and axial planes. Magnetic field artifacts were visible when the orthogonal coils at the catheter tip were energized. Variable amounts of current applied to a single coil demonstrated consistent catheter deflection in all water bath experiments. Changing current polarity reversed the observed direction of deflection, whereas current applied to two different coils resulted in deflection represented by the composite vector of individual coil activations. Microcatheter navigation through the vascular phantom was successful through control of applied current to one or more coils. CONCLUSIONS: Controlled catheter deflection is possible with laser lithographed multiaxis coil-tipped catheters in the MR imaging environment.
Authors: Fabio Settecase; Steven W Hetts; Alastair J Martin; Timothy P L Roberts; Anthony F Bernhardt; Lee Evans; Vincent Malba; Maythem Saeed; Ronald L Arenson; Walter Kucharzyk; Mark W Wilson Journal: Acad Radiol Date: 2010-11-13 Impact factor: 3.173
Authors: Anthony Bernhardt; Mark W Wilson; Fabio Settecase; Leland Evans; Vincent Malba; Alastair J Martin; Maythem Saeed; Timothy P L Roberts; Ronald L Arenson; Steven W Hetts Journal: Acad Radiol Date: 2010-11-13 Impact factor: 3.173
Authors: T Krings; J Finney; P Niggemann; P Reinacher; N Lück; A Drexler; J Lovell; A Meyer; R Sehra; P Schauerte; M Reinges; F J Hans; A Thron Journal: Neuroradiology Date: 2006-04-19 Impact factor: 2.804
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Authors: Parham Moftakhar; Prasheel Lillaney; Aaron D Losey; Daniel L Cooke; Alastair J Martin; Bradford R H Thorne; Ronald L Arenson; Maythem Saeed; Mark W Wilson; Steven W Hetts Journal: Radiology Date: 2015-06-01 Impact factor: 11.105
Authors: Steven W Hetts; Maythem Saeed; Alastair Martin; Prasheel Lillaney; Aaron Losey; Erin Jeannie Yee; Ryan Sincic; Loi Do; Lee Evans; Vincent Malba; Anthony F Bernhardt; Mark W Wilson; Anand Patel; Ronald L Arenson; Curtis Caton; Daniel L Cooke Journal: J Vis Exp Date: 2013-04-04 Impact factor: 1.355
Authors: Alastair J Martin; Prasheel Lillaney; Maythem Saeed; Aaron D Losey; Fabio Settecase; Lee Evans; Ronald L Arenson; Mark W Wilson; Steven W Hetts Journal: J Magn Reson Imaging Date: 2014-05-06 Impact factor: 4.813
Authors: Aaron D Losey; Prasheel Lillaney; Alastair J Martin; Daniel L Cooke; Mark W Wilson; Bradford R H Thorne; Ryan S Sincic; Ronald L Arenson; Maythem Saeed; Steven W Hetts Journal: Radiology Date: 2014-02-12 Impact factor: 11.105
Authors: S W Hetts; M Saeed; A J Martin; L Evans; A F Bernhardt; V Malba; F Settecase; L Do; E J Yee; A Losey; R Sincic; P Lillaney; S Roy; R L Arenson; M W Wilson Journal: AJNR Am J Neuroradiol Date: 2013-07-11 Impact factor: 3.825