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Optimal structure of particles-based superparamagnetic microrobots: application to MRI guided targeted drug therapy

  • Lyès Mellal
  • Karim Belharet
  • David Folio
  • Antoine Ferreira
Research Paper
Part of the following topical collections:
  1. Nanotechnology in Biorobotic Systems

Abstract

This paper presents an optimal design strategy for therapeutic magnetic micro carriers (TMMC) guided in real time by a magnetic resonance imaging (MRI) system. As aggregates of TMMCs must be formed to carry the most amount of drug and magnetic actuation capability, different clustering agglomerations could be arranged. Nevertheless, its difficult to predict the hydrodynamic behavior of any arbitrary-shaped object due to the nonlinear hydrodynamic effects. Indeed, the drag effect is related not only to the properties of the bolus but also to its interaction with the fluid viscosity, the free-stream velocity and the container geometry. In this work, we propose a mathematical framework to optimize the TMMC aggregates to improve the steering efficiency in experimental endovascular conditions. The proposed analysis is carried out on various sizes and geometries of microcarrier: spherical, ellipsoid-like, and chain-like of microsphere structures. We analyze the magnetophoretic behavior of such designs to exhibit the optimal configuration. Based on the optimal design of the boluses, experimental investigations were carried out in mm-sized fluidic artery phantoms to demonstrate the steerability of the magnetic bolus using a proof-of-concept setup. The experiments demonstrate the steerability of the magnetic bolus under different velocity, shear-stress, and trajectory constraints with a laminar viscous fluidic environment. Preliminary experiments with a MRI system confirm the feasibility of the steering of these TMMCs in hepatic artery microchannel phantom.

Keywords

Targeted drug delivery Magnetic steering Superparamagnetic microrobot Optimal design 

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.INSA Centre Val de Loire, Université d’Orléans, PRISME EA 4229BourgesFrance
  2. 2.Hautes Études d’Ingénieur campus Centre, PRISME EA 4229ChâteaurouxFrance

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