Bioinspired heliconical auxetic biofibers for intelligent biomechanical surveillance

Clinical Snapshot

Key Findings

• P Value: Not reported

• Effect Size: Gauge factor: 11.75; Negative Poisson's ratio: ν = −0.47; Electrical output: 8.1 V; Power density: 8.48 mW/m²

• Primary Outcome: Strain sensitivity of the auxetic biofiber, quantified as a gauge factor (strain factor) of 11.75 under mechanical deformation

• Nnt Or Sensitivity: Diagnostic sensitivity and specificity for clinical biomechanical outcomes not reported; no NNT calculable. Device sensitivity expressed as engineering gauge factor only.

• Confidence Interval: Not reported

Clinical Application

Currently limited to laboratory prototype stage. Significant engineering, regulatory, and clinical validation work is required before clinical deployment. Manufacturing reproducibility, long-term wearability, washability, and integration with clinical data systems remain unaddressed. In Australia, any wearable device intended for physiological monitoring would require TGA registration as a medical device (likely Class IIa or higher under the Therapeutic Goods (Medical Devices) Regulations 2002). No PBS reimbursement pathway exists for novel wearable biomechanical sensors at this stage. RACGP and relevant specialist colleges (AFRM, ASMF) have not issued guidance on auxetic fiber-based wearables. The collagen-based component may raise TGA scrutiny regarding biological material sourcing and sterility. Australian researchers interested in this technology should note the absence of any clinical trial registration or ethics approval documentation in the available publication data. Theoretically applicable to patients requiring continuous biomechanical monitoring of lower-limb function — including post-stroke rehabilitation, orthopaedic post-operative monitoring, sports medicine, and neuromuscular disease surveillance — but no clinical validation exists to support deployment in any of these groups

Abstract

Wearable bio-based fibers are emerging as platforms for biomechanical sensing and physiological interaction. However, achieving high sensitivity to subtle mechanical cues while maintaining flexibility, self-powered output, and distributed perception remains challenging. Inspired by the helical twining mechanics of climbing plant stems, we design a mechano-adaptive auxetic electronic bio-based fiber as an embodied intelligence sensing unit. The dual-modulus helical confinement, achieved by wrapping rigid aramid fiber/polydimethylsiloxane helices around a flexible collagen aggregate/waterborne polyurethane core, enables programmable deformation and a stable negative Poisson's ratio (ν = -0.47). Nonlinear intercomponent coupling facilitates synergistic axial-radial dynamics, amplifying interfacial contact variation under strain. The optimized fiber exhibits ultrahigh sensitivity (strain factor: 11.75), strong electrical output (8.1 volts), and remarkable power density (8.48 milliwatts per square meter) with excellent cyclic stability. Integrated into fiber-sensing arrays, it decodes microstrain patterns linked to lower-limb function, offering a scalable strategy for self-powered, adaptive, and durable biomechanical monitoring.

References

1. 1.Zhou, Y., Wang, X., Wang, Y., Xie, L., Qiang, Y., Wang, W., Li, L., Yue, O., & Liu, X. (2026). Bioinspired heliconical auxetic biofibers for intelligent biomechanical surveillance. Science Advances. https://doi.org/10.1126/sciadv.aed6233