scholarly journals An Approach to Improve the Misalignment and Wireless Power Transfer into Biomedical Implants Using Meandered Wearable Loop Antenna

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Muayad Kod ◽  
Jiafeng Zhou ◽  
Yi Huang ◽  
Muaad Hussein ◽  
Abed P. Sohrab ◽  
...  
Keyword(s):  
Medical Devices ◽  
Flux Line ◽  
Wireless Power Transfer ◽  
Loop Antenna ◽  
Glucose Measurement ◽  
Power Transfer ◽  
Wireless Power ◽  
Implantable Medical Devices ◽  
Dc Power ◽  
Loop Antennas

An approach to improve wireless power transfer (WPT) to implantable medical devices using loop antennas is presented. The antenna exhibits strong magnetic field and dense flux line distribution along two orthogonal axes by insetting the port inside the antenna area. This design shows excellent performance against misalignment in the y-direction and higher WPT as compared with a traditional square loop antenna. Two antennas were optimized based on this approach, one wearable and the other implantable. Both antennas work at both the ISM (Industrial, Scientific, and Medical) band of 433 MHz for WPT and the MedRadio (Medical Device Radiocommunications Service) band of 401–406 MHz for communications. To test the WPT for implantable medical devices, a miniaturized rectifier with a size of 10 mm × 5 mm was designed to integrate with the antenna to form an implantable rectenna. The power delivered to a load of 4.7 kΩ can be up to 1150 μW when 230 mW power is transmitted which is still under the safety limit. This design can be used to directly power a pacemaker, a nerve stimulation device, or a glucose measurement system which requires 70 μW, 100 μW, and 48 μW DC power, respectively.

Wireless Power Transfer to Implantable Medical Devices With Multi-Layer Planar Spiral Coils

2021 ◽  
pp. 457-481
Author(s):  
N. Sertac Artan ◽  
Reza K. Amineh
Keyword(s):  
Medical Devices ◽  
Wireless Power Transfer ◽  
Health Condition ◽  
Implantable Cardioverter Defibrillators ◽  
Power Transfer ◽  
Wireless Power ◽  
Implantable Medical Devices ◽  
Implanted Medical Devices ◽  
Spiral Coils ◽  
Cardioverter Defibrillators

Implantable medical devices such as pacemakers, implantable cardioverter defibrillators, deep brain stimulators, retinal and cochlear implants are gaining significant attraction and growth due to their capability to monitor the health condition in real time, diagnose a particular disease, or provide treatment for a particular disease. In order to charge these devices, wireless power transfer technology is considered as a powerful means. This eliminates the need for extra surgery to replace the battery. In this chapter, some of the major implanted medical devices are reviewed. Then, various wireless power transfer configurations are reviewed briefly for charging such devices. The chapter continues with reviewing wireless power transfer configurations based on the multi-layer printed or non-printed planar spiral coils. At the end, some of the recent works related to using multi-layer planar spiral coils for safe and efficient powering of IMDs will be discussed.

scholarly journals Wireless Power Transfer Techniques for Implantable Medical Devices: A Review

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3487 ◽  
Author(s):  
Sadeque Reza Khan ◽  
Sumanth Kumar Pavuluri ◽  
Gerard Cummins ◽  
Marc P. Y. Desmulliez
Keyword(s):  
Medical Devices ◽  
Wireless Power Transfer ◽  
The Body ◽  
Transfer Efficiency ◽  
Power Transfer ◽  
Wireless Power ◽  
Implantable Medical Devices ◽  
Wide Range ◽  
Power Transfer Efficiency ◽  
Tissue Safety

Wireless power transfer (WPT) systems have become increasingly suitable solutions for the electrical powering of advanced multifunctional micro-electronic devices such as those found in current biomedical implants. The design and implementation of high power transfer efficiency WPT systems are, however, challenging. The size of the WPT system, the separation distance between the outside environment and location of the implanted medical device inside the body, the operating frequency and tissue safety due to power dissipation are key parameters to consider in the design of WPT systems. This article provides a systematic review of the wide range of WPT systems that have been investigated over the last two decades to improve overall system performance. The various strategies implemented to transfer wireless power in implantable medical devices (IMDs) were reviewed, which includes capacitive coupling, inductive coupling, magnetic resonance coupling and, more recently, acoustic and optical powering methods. The strengths and limitations of all these techniques are benchmarked against each other and particular emphasis is placed on comparing the implanted receiver size, the WPT distance, power transfer efficiency and tissue safety presented by the resulting systems. Necessary improvements and trends of each WPT techniques are also indicated per specific IMD.

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