Cultivating Fully Biomass Pressure Sensors for Gait Analysis

Area of Science:

• Biomaterials Engineering
• Wearable Technology
• Biomedical Sensors

Background:

• Traditional 2D bacterial cellulose (BC) pressure sensors face limitations in continuous sensing under large pressures due to their structure.
• Plantar monitoring technologies require robust and accurate pressure-sensing capabilities for effective user defense against insecure wear and detection inaccuracies.

Purpose of the Study:

• To develop hierarchical fully biomass pressure sensors (HFBPSs) with enhanced sensing capabilities and structural stability for plantar pressure detection.
• To overcome the low operating range limitations of conventional 2D BC pressure sensors.

Main Methods:

• A microbial engineering strategy was employed to fabricate HFBPSs.
• Incorporation of the biobased material loofah created micro- and nanostructured sensing networks within a hierarchical structure.
• The sensor's dynamic series-parallel circuit configuration allows adaptation to large pressures.

Main Results:

• The developed HFBPSs exhibit ultrahigh sensitivity (2.82 kPa⁻¹) and a wide detection range (0-600 kPa).
• The sensors demonstrated stable monitoring of gait motions.
• Integration into smart insoles enabled recognition of nonstandard Tai Chi movements.

Conclusions:

• The innovative hierarchical structure design overcomes the limitations of traditional 2D BC sensors.
• HFBPSs offer exceptional pressure-sensing performance for plantar monitoring applications.
• This technology has significant implications for the future development of advanced smart insoles.