Traditional scoliosis orthoses are limited by imperceptible corrective forces and force degradation during prolonged wear, which compromise treatment efficacy. To address these challenges, this paper presents a novel modular orthosis design integrating a bidirectional ratchet mechanism with thin-film force sensing technology. The core ratchet knob enables the precise application and mechanical locking of corrective force, ensuring long-term stability, while the integrated sensor system provides real-time monitoring. The proposed design was systematically validated through finite element analysis, bench testing, and human trials. Results demonstrate that the ratchet mechanism reliably withstands a 100 N corrective load without failure. The complete system weighs only 1.595 kg with a theoretical continuous operating time of 22.4 hours. The sensing module exhibits high linearity (R 2 = 0.994) and a rapid response time of less than 100 ms. In human trials, the orthosis maintained an effective three-point pressure balance (with a pressure distribution ratio of 2.4:1) and demonstrated robust force retention, with pressure readings returning to baseline within 2 s after dynamic movements. By resolving the limitations of uncontrollable and unstable forces in traditional devices, this intelligent orthosis offers a promising technical solution for personalized and precise scoliosis treatment. • Traditional scoliosis orthoses lack the ability to adjust and monitor corrective forces, making them inadequate for addressing the variable conditions of scoliosis correction. • The application of modular design and bidirectional ratchet mechanism can effectively achieve the maintainable of corrective force. • The monitoring system based on thin film force sensors can timely reflect the changes in corrective force of scoliosis orthosis. • The wearing experiment confirms the corrective force adjustment and monitoring capability of the developed orthosis.
Yang et al. (Fri,) studied this question.