Biodegradable microneedle-based electrodes for electrophysiological measurements.

Area of Science:

• Biomedical Engineering
• Materials Science
• Neuroscience

Background:

• Traditional wet gel electrodes for biopotential recordings (EEG, ECG) require tedious setup and can yield unreliable signals due to gel leakage or drying.
• Existing methods necessitate skin preparation, adding complexity and discomfort for patients.

Purpose of the Study:

• To develop and evaluate novel, initially dry hydrogel microneedle (MN)-based electrodes as a replacement for conventional wet gel electrodes.
• To assess the safety, comfort, and signal quality of these biodegradable MN electrodes for biopotential measurements.

Main Methods:

• Fabrication of biocompatible and biodegradable hydrogel MN patches using cross-linked carboxymethylcellulose (CMC).
• Integration of a metal transduction layer for wearable electrode functionality.
• Evaluation of MN patch swelling, ion-conducting capacity, and electrical measurement capabilities using a skin phantom.

Main Results:

• Demonstrated swelling and ion-conducting capacity of the CMC-based MN patches.
• MN-based electrodes showed superior measurement quality compared to standard wet gel electrodes.
• Successful biopotential recording capability was confirmed in a proof-of-concept study.

Conclusions:

• Biodegradable hydrogel MN electrodes offer a user-friendly, comfortable, and safe alternative for long-term biopotential monitoring.
• These electrodes eliminate the need for skin preparation and overcome limitations associated with wet gel electrodes.
• The technology shows promise for improved patient experience and robust signal acquisition in wearable biosensing applications.