Influence of Fixation on Magnetic Properties of Glass-Coated Magnetic Microwires for Biomedical Applications

Abstract

The control of biomechanical processes in the tissue-implant interface and thermal changes created by friction or inflammatory processes in the implant and its environment represent the key validating processes of the postimplanting process. It is crucial for a patient and their health to minimize the invasiveness of the temperature measuring processes and the inner mechanical stress in the implant-tissue interface. For the purpose of these measurements, amorphous magnetic glass-coated microwires are the most suitable. Compared with other sensors, such as radio frequency identification sensors, the microwires have a significant advantage due to their dimensions (∼2 cm × 50 µm) (because of which the sensor almost does not interfere with the inner implant structures), their production is relatively cheap, and only ∼20 mm microwire is needed for the functional sensor. This paper is concerned with the testing of more types of microwire fixation in an implant and the impact of the fixation; it deals with necessary magnetic properties of a microwire and their dependence on the temperature. Microwire made of master alloy Fe 78 W 5 B 17 was created and fixed in four ways: 1) on one end; 2) on two ends; 3) in the middle; and 4) along its full length. The results show that the optimal way of fixation is the one along the full length of a microwire; however, the final signal is influenced by both, the type and volume of the applied fixation material. The highest sensitivity of the designed microwire was in the range of 120-140°C with no fixation and only with the full length fixation, this sensitivity decreased to 40-50°C, which is a level close to the level required for biomedical applications (35-42°C).Index Terms-Amorphous magnetic glass-coated microwires, magnetoelasticity, smart implants, switching field.

Modelling of the Structure and the Required Level of Performance Properties of a Polytetrafluoroethylenecomposites for Sealing

“…The results of research in the field of PCM based on PTFE convincingly proved the effectiveness of the use of carbon fiber ( Figure 2). Established its optimal content of PTFE composites varies over a wide range (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) wt. % depending on the grade of the filler [3,6,10,11].…”

“…To take into account the stress relaxation of the sealing element made of elastomer in the model (1), the Mooney -Rivlin constants were recalculated based on the value of the relative residual strain of 0.6; the following values were obtained [11,[15][16][17][18][19][20][21]: C10 = 781178.6 Pa; C01 = 154173.9 Pa.…”

Angular Dependence of the Ferromagnetic Resonance Parameters of [Ti/FeNi]6/Ti/Cu/Ti/[FeNi/Ti]6 Nanostructured Multilayered Elements in the Wide Frequency Range

“…They are applicable to very different kind of nanostructures, including magnetic composites with nanocomponents [4]. Among other microwave materials, high permeability soft magnetic wires, ribbons, films and multilayered nanostructures with ferromagnetic layers are highly requested in numberless technological [5][6][7][8][9] and biomedical applications [10][11][12][13][14].…”

“…There are two microwave phenomenon most studied for soft ferromagnetic nanostructures in a view of their possible sensor and actuator applications: Ferromagnetic resonance [19,20] and giant magnetoimpedance effect [12,13,[21][22][23][24]. Ferromagnetic resonance (FMR) can be defined as resonant absorption of microwave radiation by magnetic material with strongly coupled electrons under application of a DC magnetic field [20,24].…”

Microwire-Based Sensor Array for Measuring Wheel Loads of Vehicles

“…Recent attention has turned to the development of innovative material and composites derived from these microwires based on magnetic bistability [24,25,26,27], such as carbon or glass fiber [14], polymer composites [28] and titanium implants [29].…”