Characteristics of Magnetorheological Fluids Applied to Prosthesis for Lower Limbs

Arteaga, Oscar; Erazo, Maria I.; Terán, Héctor C.; Camacho, Diego; Velasco, Alvaro; Mera, Erick; Bou-Ali, M. M.; Berasategi, Joanes

doi:10.1166/asl.2018.12338

Cited by 2 publications

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“…Upon increasing the external magnetic field intensity from 20 to 100 mT, a lot of chains or bands of starch granules distributed along the magnetic field direction were clearly observed. These uniformly dispersed Fe particles were first magnetized, then attracted to each other, and finally formed the clusters and chains along the magnetic field direction to minimize the magnetic potential energy, , leading to the squeezing of the starch granules and the formation of the bands (Figure l1,2). According to the equivalent magnetic charge theory, the fluctuated boundary is usually distributed with positive and negative equivalent magnetic charges, and the equivalent magnetic charges tend to attract each other (Figure l3).…”

Section: Resultsmentioning

confidence: 99%

Solid–Liquid State Transformable Magnetorheological Millirobot

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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Magnetically actuated soft millirobots (magneto-robot) capable of accomplishing on-demand tasks in a remote-control manner using noninvasive magnetic fields are of great interest in biomedical settings. However, the solid magneto-robots are usually restricted by the limited deformability due to the predesigned shape, while the liquid magneto-robots are capable of in situ shape reconfiguration but limited by the low stiffness and geometric instability due to the fluidity. Herein, we propose a magneto-active solid–liquid state transformable millirobot (named MRF-Robot) made from a magnetorheological fluid (MRF). The MRF-Robot can transform freely and rapidly between the Newtonian fluid in the liquid state upon a weak magnetic field (∼0 mT) and the Bingham plasticity in the solid state upon a strong magnetic field (∼100 mT). The MRF-Robot in the liquid state can realize diverse behaviors of large deformation, smooth navigation, in situ splitting, merging, and gradient pulling actuated by a weak magnetic field with a high gradient. The MRF-Robot in the solid state is distinguished for the controllable locomotion with reconfigured shapes and versatile object manipulations (including pull, push, and rotate the objects) driven by a strong magnetic field with a high gradient. Moreover, the MRF-Robot could continuously maneuver to accomplish diverse tasks in the comprehensive scenes and achieve liquid-drug delivery, thrombus clearance, and fluid-flow blockage in the phantom vascular model under magnetic actuation.

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Section: Resultsmentioning

confidence: 99%

Solid–Liquid State Transformable Magnetorheological Millirobot

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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Dynamic Model and Parameterized Design of Prosthetic Knee

Liu

Fang

et al. 2023

Journal of Testing and Evaluation

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In this paper, an intelligent prosthetic knee joint was designed, and the dynamic model was established by using Lagrange theory to carry out the parametric design of the intelligent prosthetic knee joint. The parametric prosthetic leg was simulated by ADAMS simulation software, the performance of the prosthetic leg was tested, and the driving torque and damping force of the prosthetic leg were analyzed under different road conditions. The results showed that the drive torque of the prosthesis varied widely, requiring a larger drive torque during swinging. During the swing period, the damping force was larger. Compared with going up stairs and going up slopes, the damping force was the largest when going down stairs and going down slopes. Therefore, the intelligent prosthetic knee joint can lay a solid foundation for good gait, and at same time, the structure and good parametric design can make the intelligent prosthetic knee joint achieve good performance.

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Characteristics of Magnetorheological Fluids Applied to Prosthesis for Lower Limbs

Cited by 2 publications

References 0 publications

Solid–Liquid State Transformable Magnetorheological Millirobot

Solid–Liquid State Transformable Magnetorheological Millirobot

Dynamic Model and Parameterized Design of Prosthetic Knee

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