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Design and Development of a Mobile Sit-to-Stand Assistive Device

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Abstract

This work presents the design and development of an assistive device to enable natural sit-to-stand motion for individuals with lower extremity weakness. The device is conceptualized based on the synthesis of a four-bar linkage using the Burmester curve theory, the coupler of which follows the elbow trajectory of the user during sit-to-stand motion. The four-bar mechanism is incorporated in a frame that ensures stability during STS and has multiple support locations for easy and comfortable STS transfer of the user. The STS device is portable and actuated by a pair of battery-operated linear actuators enabled with a switch operated by the user. The STS device is fabricated using extruded aluminium profiles which makes it lightweight, modular for easy assembly, and adjustable to different users. The device is tested on a number of healthy subjects for whom the ground reaction forces (GRF) during STS are compared with and without using the device. Approximately 45% reduction of GRF was noted while using the STS device. Further a dynamics based optimization model was created to calculate the forces at the various support points where the user comes in contact with the STS device. The results of optimization model were compared with an experiment and found to be within 10% of experimental data. The designed and developed STS device has potential of becoming a commercial product.

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Acknowledgements

The STS experiments with healthy volunteers were permitted under IIT Madras institute ethical committee (IEC) protocol number IEC/2021-01/SR/02. The authors would like to acknowledge PORTESCAP India Pvt Ltd. for funding fabrication of the STS device.

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The authors have not disclosed any funding.

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  1. Mechanical Engineering Indian Institute of Technology, Chennai, 600036, Tamilnadu, India

    Satyajit Halder & Sourav Rakshit

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  1. Satyajit Halder
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  2. Sourav Rakshit
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Correspondence to Sourav Rakshit.

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The STS device has been filed for Indian patent with provisional application number 202441012717.

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Halder, S., Rakshit, S. Design and Development of a Mobile Sit-to-Stand Assistive Device. J. Inst. Eng. India Ser. C 105, 299–312 (2024). https://doi.org/10.1007/s40032-024-01030-6

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  • DOI: https://doi.org/10.1007/s40032-024-01030-6

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