Investigation of transcutaneous electrical nerve stimulation improvements with microneedle array electrodes based on...

Area of Science:

• Biomedical Engineering
• Medical Devices
• Electrophysiology

Background:

• Transcutaneous electrical nerve stimulation (TENS) is widely used for pain management and rehabilitation.
• Conventional surface electrodes have limitations in targeting specific nerves and achieving precise current delivery.
• Advancements in electrode technology are crucial for improving TENS efficacy.

Purpose of the Study:

• To compare the performance of microneedle array electrodes with conventional surface electrodes for TENS.
• To evaluate key stimulation parameters, including current density, selectivity, and tissue response.
• To assess the potential of microneedle electrodes for enhanced, targeted nerve stimulation.

Main Methods:

• Development of a three-dimensional finite element multiphysics model of human tissue.
• Simulation of electrical current flow and its effects under both microneedle and surface electrodes.
• Analysis of parameters such as current density distribution, space constant, specific absorption ratio, stimulation selectivity, temperature rise, and blood flow.

Main Results:

• Microneedle electrodes demonstrated up to 10% higher stimulation selectivity compared to surface electrodes.
• Stimulation with microneedle electrodes resulted in more robust current density across varying tissue depths.
• Microneedle electrodes exhibited enhanced stimulation parameters, particularly for precise nerve targeting at specific depths.

Conclusions:

• Microneedle array electrodes represent a significant advancement over conventional surface electrodes for TENS.
• The enhanced selectivity and current distribution of microneedle electrodes improve the precision of nerve targeting.
• This technology holds promise for more effective and localized therapeutic electrical stimulation applications.