Abstract
Trunk compensations are commonly observed when stroke patients perform reaching tasks, that negatively affect their long-term motor recovery. To restrain the compensatory patterns, this study proposes a learning-based compensation-corrective (LBCC) control strategy for upper limb rehabilitation robots. The proposed LBCC strategy comprises a learning and a reproduction phase. Specifically, a learning from demonstration framework is employed to generalize the referenced task in the learning phase. The compensatory patterns are corrected by shoulder restraint, hand assistive, and coupling force feedback, which are generated by the LBCC control strategy, in the reproduction phase. Experiments were carried out on ten healthy subjects as a feasibility study. The trunk compensations were significantly reduced in three types of reaching tasks with the force feedback. In addition, the proposed LBCC control strategy significantly enhances the upper limb motor performance, therefore, providing a user experience similar to human-assisted rehabilitation for stroke patients.
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Data Availability
The datasets analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors would like to thank Weifeng Wu, Gengliang Lin and Yonghao Song for functional assessments and useful discussions. The authors also would like to thank Professor Haizhou Li for his insightful comments.
Funding
This work was supported in part by the National Natural Science Foundation of China (Grant No. 52075177), the National Key Research and Development Program of China (Grant No. 2021YFB3301400), Research Foundation of Guangdong Province (Grant Nos. 2019A050505001 and 2018KZDXM002), Guangzhou Research Foundation (Grant Nos. 202002030324 and 201903010028), Zhongshan Research Foundation (Grant Nos. 2020B2020 and 2021B2022).
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Informed consent was obtained from all the subjects to complete the protocol approved by the Guangzhou First People’s Hospital Department of Ethics Committee. All the procedures were performed in accordance with the Declaration of Helsinki.
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Xie, P., Lin, C., Cai, S. et al. Learning-Based Compensation-Corrective Control Strategy for Upper Limb Rehabilitation Robots. Int J of Soc Robotics (2022). https://doi.org/10.1007/s12369-022-00943-5
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DOI: https://doi.org/10.1007/s12369-022-00943-5