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Ultrasonography

Ultrasonography

Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...

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A Study on Ultrasonic Wireless Power Transfer With Phased Array for Biomedical Implants.

Zeinab Kashani, Mehdi Kiani

IEEE Transactions on Biomedical Circuits and Systems

|June 2, 2023

Summary

This summary is machine-generated.

This study demonstrates a wireless power transfer system using ultrasound for small biomedical implants. The system safely delivers power to millimeter-sized receivers, showing sensitivity to errors but enabling implant localization.

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Area of Science:

Biomedical Engineering
Acoustic Engineering
Wireless Power Transfer

Background:

Efficient wireless power transfer (WPT) is crucial for miniaturized biomedical implants.
Ultrasound (US) offers a promising modality for WPT due to its safety and penetration capabilities.
Precise beam focusing and steering are essential for reliable US WPT to millimeter-sized devices.

Purpose of the Study:

To design, fabricate, and analyze an ultrasound wireless power transfer link.
To investigate the performance of US WPT with various millimeter-sized receivers.
To evaluate the impact of beamforming errors and assess implant localization capabilities.

Main Methods:

Fabrication of a 32-element, 0.94 MHz phased array transducer.
Testing power delivery to different millimeter-sized US receivers at various depths and angles.
Analysis of power reduction due to random errors in phased array delays.
Evaluation of implant localization using a subset of array elements and interpolation methods.

Main Results:

The system delivered power within FDA safety limits (720 mW/cm²) to millimeter-sized receivers.
Received power varied based on receiver size and shape (e.g., 0.095 mW to 0.53 mW).
Sphere-shaped transducers showed higher tolerance to misalignment.
Random errors in beamforming significantly reduced delivered power.
Implant localization was feasible using only 5 elements and various interpolation techniques.

Conclusions:

The developed ultrasound WPT system is viable for powering small biomedical implants.
System performance is sensitive to beamforming errors, necessitating robust control.
The technology shows potential for accurate implant localization.
Further research can optimize transducer design and error mitigation strategies for enhanced efficiency and reliability.