Design and Implementation of Multisite Stimulation System Using a Double-Tuned Transmitter Coil and Miniaturized...

Area of Science:

• Biomedical Engineering
• Radio Frequency Engineering

Background:

• Multisite biomedical applications require efficient wireless power and data transfer.
• Existing systems often use separate coils for different frequencies, increasing complexity and size.
• Minimizing coil size and unwanted electromagnetic coupling is crucial for implantable devices.

Purpose of the Study:

• To present a double-tuned, dual-input transmitter coil operating at 13.56 MHz and 40.68 MHz.
• To reduce system size and electromagnetic interference by eliminating the need for separate coils.
• To demonstrate synchronized multisite stimulation of implantable receivers.

Main Methods:

• Design and analysis of a double-tuned transmitter coil utilizing a lumped element frequency trap.
• Measurement of coil performance, including impedance matching and isolation at both operating frequencies.
• Testing of synchronized stimulation using flexible implantable receiver coils through biological tissue (chicken breast).

Main Results:

• The transmitter coil achieved excellent impedance matching (-26.2 dB at 13.56 MHz, -21.5 dB at 40.68 MHz).
• High isolation was measured between the two operating frequencies (-17.7 dB at 13.56 MHz, -11.7 dB at 40.68 MHz).
• Synchronized multisite stimulation of two flexible implants was successfully demonstrated at a 2 cm distance, even when covered by 1 cm of chicken breast.

Conclusions:

• The developed double-tuned transmitter coil is effective for multisite biomedical applications.
• This technology simplifies system design and enhances performance for wireless implantable devices.
• The coil shows promise for future advancements in medical technology requiring dual-frequency operation.