Epidermal secretion-purified biosensing patch with hydrogel sebum filtering membrane and unidirectional flow...

Area of Science:

• Biomedical Engineering
• Materials Science
• Wearable Technology

Background:

• Real-time sweat analysis via biosensing electronics is crucial for non-invasive health monitoring.
• Sebum interference significantly limits the reliability of current wearable biosensors.
• Existing methods struggle to maintain sensor accuracy in practical, real-world conditions.

Purpose of the Study:

• To develop a flexible biosensing patch capable of filtering epidermal secretions, specifically sebum.
• To enhance the accuracy and reliability of continuous sweat analysis for health monitoring.
• To create a self-cleaning, sebum-resistant biosensing system.

Main Methods:

• Fabrication of a dual-layer hydrogel filtering membrane using poly(hydroxyethyl methacrylate) and nano-brush structured poly(sulfobetaine).
• Integration of unidirectional flow microfluidic channels with Tesla valves to prevent contamination and ensure sweat refreshing.
• Incorporation of the filtering membrane and microfluidics into a flexible epidermal biosensing patch.

Main Results:

• The biosensing patch effectively eliminated sebum and sebum-soluble substance interference.
• The dual-layer membrane provided sebum resistance and self-cleaning capabilities.
• Continuous monitoring of uric acid, pH, and sodium ions in sweat achieved improved accuracy up to 12%.

Conclusions:

• The epidermal secretion-purified biosensing patch significantly enhances sweat sensing reliability by mitigating sebum interference.
• The developed technology is compatible with various biosensors, paving the way for advanced wearable healthcare devices.
• This strategy offers a promising solution for robust, non-invasive health monitoring.