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The use of global magnetic fields—typically produced by pairs of Maxwell and Helmholtz coils—offers the advantage of generating uniform magnetic fields and magnitude uniform gradient distributions over extensive volumes, while ensuring easy control. However, achieving selective control of multiple magnetic microrobots under such global fields remains problematic. In this study, we utilize a magnet...Show More
Feedbackless Automatic Control of Magnetic Milli/Microrobots: Generation and Control of a Trapping Point Using a Single Coil Electromagnetic System
This article presents a novel strategy for two-dimensional (2-D) feedbackless automatic locomotion on a liquid surface by magnetic milli/microrobots, using only one coil. By exploiting the tendency of a magnet to move toward and remain at the point of maximum magnetic field, we created a “trapping point” (TP) located at the axis of the coil to confine a magnetic millirobot within it. The TP is cre...Show More
Magnetic microrobots are propelled by magnetic fields or magnetic field gradients generated by electromagnetic systems. Generally, 3D Helmholtz coils systems are used for microrobot propulsion, because of their low power consumption, ease of manufacture, and ease of control, for which, only three power supplies are required. Systems of this kind can only generate uniform magnetic fields, which lim...Show More
Nanofibers are being widely applied in biomedicine, especially in tissue engineering given their porosity. We developed magnetic nanofibrous membranes aiming to devise new applications that use their thermal properties and mobility for actively targeted hyperthermia and microrobots. We fabricated Fe3O4 (iron oxide)/PAN (polyacrylonitrile) nanofibrous membranes and verified the properties of corres...Show More
In this study, the authors developed a novel active guidewire including a spiral-type magnetic microrobot and ball joint to realize active locomotion and improve the steering capability within external magnetic fields. Most active guidewires provide only steering ability without active locomotion, and their steering angles depend on the physical properties of the wire. The developed mechanism prov...Show More
A micro-fluid manipulation technique is introduced using spiral-type magnetic micromachines as pumps, channel selector, and active valves. Magnetic micromachines, also known as microrobots, have been widely studied for biomedical applications because they offer wireless control and microscopic size. Spiral-type magnetic micromachines, which contain a screw mechanism, are synchronized by an externa...Show More
Design and Control of Field-Free Region Using Two Permanent Magnets for Selective Magnetic Hyperthermia
Armando Ramos Sebastian;Se Hwan Ryu;Haye Min Ko;Sung Hoon Kim
Magnetic hyperthermia using magnetic nano particles (MNPs) is a very innovative method for application in cancer therapy. However, the heat generated by MNPs can destroy normal cells, which necessitates localized heat treatment methods to minimize the damage inflicted by magnetic hyperthermia. One such method involves the use of a field-free region (FFR). In this paper, the conditions for controll...Show More
Hybrid control of magnetic micro-robot using three-axis Helm-holtz coil
2018 IEEE International Magnetics Conference (INTERMAG)
Year: 2018 | Conference Paper |
Cited by: Papers (1)
Magnetic robots and their magnetic manipulation systems are innovative approaches for the diagnosis and therapy of minimally invasive medicine. Medical magnetic robots have been applied to targeted drug delivery, drilling in blood vessels, and a robotic capsule-endoscope for diagnosis and therapy [1–3]. Typically, the magnetic robots are controlled by various types of magnetic field: gradient, alt...Show More
Magnetically axial-coupled propeller-based portable electromangetic energy-harvesting device using air and water stream
2018 IEEE International Magnetics Conference (INTERMAG)
Year: 2018 | Conference Paper |
Cited by: Papers (2)
Energy-harvesting devices have been widely developed and reported [1–3]. In general, energy-harvesting devices utilize piezoelectric, electrostatic, and electromagnetic methods. Piezoelectric generators convert vibration into a voltage output but generate relatively high voltage (to a maximum of hundreds of V) and low electrical current. Electrostatic generators provide a relatively high output vo...Show More
A novel finger rehabilitation method using an electromag-netic system
2017 IEEE International Magnetics Conference (INTERMAG)
Year: 2017 | Conference Paper |
Hand rehabilitation and training systems generally utilize either robot hands or robotic gloves [1–3]. These devices generate the repetitive gripping motion of fingers. The configuration of robot hands, which consist of electrical motors, wires, gears, etc., is complex, making them difficult to wear. To avoid these problems, many researchers have been developing soft robotic gloves that utilize fl...Show More
Wireless Active Finger Rehabilitation Method Using Three-Axis Electromagnetic Manipulation
IEEE Transactions on Magnetics
Cited by: Papers (3)
This paper presents a wireless active finger rehabilitation method controlled magnetic forces within a three-axis coil system. The three-axis coils enhanced degree of freedom in hand positioning. The developed system includes three magnets for controlling one finger within the coil, thus, providing external force to the finger without the use of a complex mechanical structure. The proposed method ...Show More
Rotary-Type Electromagnetic Power Generator Using a Cardiovascular System As a Power Source for Medical Implants
Power-harvesting devices have received attention as power supplies for implantable medical devices. Power-harvesting technologies can overcome the limitation of a battery, such as limited battery lifetime and repeated surgical interventions. However, micropower generators do not meet the energy requirements of medical implants such as neural recording, implantable hearing aids, and implantable wir...Show More
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