Study on a hydrophobic Ti-doped hydroxyapatite coating for corrosion protection of a titanium based alloy

RSC Advances ◽  
2016 ◽  
Vol 6 (90) ◽  
pp. 87665-87674 ◽  
Author(s):  
M. A. Surmeneva ◽  
A. Vladescu ◽  
R. A. Surmenev ◽  
C. M. Pantilimon ◽  
M. Braic ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Direct Contact ◽  
Biomedical Applications ◽  
Implantable Devices ◽  
Hydroxyapatite Coating ◽  
Hydroxyapatite Coatings

In the paper, hydroxyapatite coatings enriched with Ti were prepared as a possible candidate for biomedical applications, especially for implantable devices that are in direct contact with bone.

Aerogels for Biomedical Applications

2021 ◽  
pp. 23-42
Keyword(s):  
Drug Delivery ◽  
Tissue Engineering ◽  
Regenerative Medicine ◽  
Bone Regeneration ◽  
Biomedical Applications ◽  
Implantable Devices ◽  
Strategic Development ◽  
The World ◽  
Biomedical Field ◽  
Materials Used

The researchers across the world are actively engaged in strategic development of new porous aerogel materials for possible application of these extraordinary materials in the biomedical field. Due to their excellent porosity and established biocompatibility, aerogels are now emerging as viable solutions for drug delivery and other biomedical applications. This chapter aims to cover the diverse aerogel materials used across the globe for different biomedical applications including drug delivery, implantable devices, regenerative medicine encompassing tissue engineering and bone regeneration, and biosensing.

scholarly journals Comparison of Series Compensation Topologies for Inductive Chargers of Biomedical Implantable Devices

Electronics ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 8 ◽  
Author(s):  
Eleni Gati ◽  
Sotirios Kokosis ◽  
Nikolaos Patsourakis ◽  
Stefanos Manias
Keyword(s):  
Experimental Evaluation ◽  
Biomedical Applications ◽  
Implantable Devices ◽  
Extensive Investigation ◽  
Key Factors ◽  
Series Compensation ◽  
Frequency Selection ◽  
Medical Issues ◽  
Custom Made ◽  
Secondary Side

Modern biomedical implantable devices provide an increasingly popular solution for health monitoring and medical issues. Their level of development in the coming years will depend on their reliability and endurance. Their powering and recharging capabilities are key factors for their dominance. In this work, series compensation topologies for use in inductive chargers of biomedical implantable devices are investigated with regard to their performance. The goal is to assess the possibility of reducing the component count of the implantable device and thus, increase its reliability and patient safety. Comparison is performed between the commonly used series-series compensation topology with a topology which incorporates no capacitors in the secondary side but only series compensation in the primary. Extensive investigation of the operation of the two topologies is made through mathematical analysis, simulations, and experimental evaluation, for the most popular schemes of operation, with regard to frequency selection. A prototype inductive charger, including a custom-made inductive link, was designed and built for the experimental evaluation of the system. Insights on the operation of both topologies are provided and the results show that primary-side series compensation can be a strong alternative to series-series compensation, in biomedical applications.

Analysis of corrosion behaviour and surface properties of plasma-sprayed composite coating of hydroxyapatite–tantalum on biodegradable Mg alloy ZK60

2019 ◽  
Vol 53 (19) ◽  
pp. 2661-2673 ◽  
Author(s):  
Balraj Singh ◽  
Gurpreet Singh ◽  
Buta Singh Sidhu
Keyword(s):  
Corrosion Resistance ◽  
Surface Properties ◽  
Corrosion Behaviour ◽  
Surface Hardness ◽  
Mg Alloy ◽  
Hydroxyapatite Coating ◽  
Hydroxyapatite Coatings ◽  
Plasma Sprayed ◽  
Incremental Increase

Magnesium (Mg) and its alloys are promising candidates for biodegradable bio-implants. However, the excessive corrosion in the physiological environment and subsequent decline in the mechanical integrity of Mg and its alloys have limited their utility as biomaterials. In the present study, an attempt has been made to improve the corrosion resistance of Mg alloy ZK60 plasma sprayed with tantalum (Ta)-reinforced hydroxyapatite coating. The experiment was conducted with three varied levels, i.e. 10, 20 and 30 weight percent (wt%) of Ta-content in hydroxyapatite coating. The coatings were characterized and in vitro corrosion behaviour was investigated by electrochemical measurements in Ringer's solution along with the analysis of surface properties. The corrosion resistance of the Mg alloy increased with the incremental increase in Ta reinforcement in hydroxyapatite coating. An increase in the protection efficiency was analysed for the Ta-reinforced hydroxyapatite coatings (∼10%, 18% and 23% for hydroxyapatite-10Ta, hydroxyapatite-20Ta and hydroxyapatite-30Ta, respectively) as compared to the pure hydroxyapatite coating. The hydroxyapatite coating effectively increased the surface hardness of the Mg alloy and Ta reinforcement further enhanced it. Surface roughness decreased with the incremental increase in Ta-content in hydroxyapatite coating. Wettability analysis revealed the hydrophilic nature of pure hydroxyapatite and Ta-reinforced hydroxyapatite coatings. The results of the study suggest that the proposed Ta reinforcement in hydroxyapatite is potentially important for biodegradable Mg bio-implants.

scholarly journals Effect of A Superstrate on On-Head Matched Antennas for Biomedical Applications

Electronics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 1099
Author(s):  
Md Rokunuzzaman Robel ◽  
Asif Ahmed ◽  
Akram Alomainy ◽  
Wayne S. T. Rowe
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Performance Improvement ◽  
Direct Contact ◽  
Biomedical Applications ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Conducting Layer ◽  
Electric And Magnetic Field ◽  
Biomedical Diagnosis

The effect of using a superstrate dielectric layer on an on-head matched antenna for biomedical diagnosis applications is investigated. Two on-head matched antennas are considered with different length meandered lines ensuring operation around 0.9 GHz frequency. The first antenna’s conductive radiating structure is in direct contact with the head phantom, whereas the second one utilises a 0.5 mm thick superstrate layer on top of the conducting layer as a buffer. The lateral dimensions of both antennas are held constant at 30 × 30 mm2. The electric and magnetic field distribution is analysed and the power penetration, 50 mm inside the head phantom, is derived from the electromagnetic field surrounding the antennas. Both homogeneous and inhomogeneous head phantoms are considered while evaluating the antennas in terms of their reflection coefficient, current distribution, electric field, magnetic field, specific absorption rate (SAR) and power penetration inside the head. The antennas are fabricated and measured utilizing an inhomogeneous phantom to validate the proposed performance improvement using a superstrate. It is shown that the superstrate antenna achieves a ~8 dB increase in power penetration inside the head phantom along with a 0.0731 W/kg decrease in SAR compared to the antenna without a superstrate.

High-Velocity Suspension Flame Sprayed (HVSFS) Hydroxyapatite Coatings for Biomedical Applications

2011 ◽  
Vol 21 (2) ◽  
pp. 275-287 ◽  
Author(s):  
N. Stiegler ◽  
D. Bellucci ◽  
G. Bolelli ◽  
V. Cannillo ◽  
R. Gadow ◽  
...  
Keyword(s):  
High Velocity ◽  
Biomedical Applications ◽  
Hydroxyapatite Coatings

Porous low modulus Ti40Nb compacts with electrodeposited hydroxyapatite coating for biomedical applications

2013 ◽  
Vol 33 (4) ◽  
pp. 2280-2287 ◽  
Author(s):  
K. Zhuravleva ◽  
A. Chivu ◽  
A. Teresiak ◽  
S. Scudino ◽  
M. Calin ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Hydroxyapatite Coating ◽  
Low Modulus

Aerosol deposition of silicon-substituted hydroxyapatite coatings for biomedical applications

2010 ◽  
Vol 518 (8) ◽  
pp. 2194-2199 ◽  
Author(s):  
Byung-Dong Hahn ◽  
Jeong-Min Lee ◽  
Dong-Soo Park ◽  
Jong-Jin Choi ◽  
Jungho Ryu ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Aerosol Deposition ◽  
Hydroxyapatite Coatings
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