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Load shift keying communication techniques in implantable devices.

Francisco Pastene¹, Martin Westermeyer¹, Maxime Verstraeten²

¹Department of Electrical Engineering, Universidad de Concepción, Concepción, Chile.

Physical and Engineering Sciences in Medicine

|August 19, 2024

Summary

This summary is machine-generated.

A novel Dual Technique (DLT) for inductive links significantly extends medical implant communication range and data rates. This load-independent method outperforms existing Short-Circuit Technique (SCT) and Open-Circuit Technique (OCT) for reliable wireless power and data transfer.

Keywords:

Implantable medical devices load-shift keying (LSK)Inductive power transfer (IPT)Power and data telemetry Simultaneous power and data telemetry Wireless power transfer (WPT)

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Area of Science:

Biomedical Engineering
Electrical Engineering
Implantable Devices

Background:

Inductive links are crucial for powering and communicating with medical implants.
Existing methods face limitations in communication distance and data rate.
Load Shift Keying (LSK) techniques modulate secondary impedance to transmit data.

Purpose of the Study:

To introduce and evaluate a novel Dual Technique (DLT) for Load Shift Keying (LSK).
To compare DLT against Short-Circuit Technique (SCT) and Open-Circuit Technique (OCT).
To assess performance under varying coil distances and load conditions for implantable devices.

Main Methods:

Implementation and comparison of SCT, OCT, and the novel DLT.
Experimental measurements and LTSpice simulations.
Evaluation focused on modulation index, bit error rate, coil distance, and load variations.

Main Results:

DLT demonstrated superior performance, extending operational communication range.
Achieved a maximum modulation index of 0.797 and a bit error rate below 10^-7 at 95 mm.
DLT proved load-independent, outperforming SCT (high load) and OCT (low load).

Conclusions:

The proposed DLT represents a significant advancement in medical implant communication.
Enhanced coil-to-coil operational distance and reliability are achieved.
DLT offers a robust solution for wireless power and data transfer in implants.