Based on the linked source; automatically prepared and checked against the original report.
Design approach
The proposed wheelchair addresses difficulties that people with lower-limb disabilities may face during sit-to-stand transitions, which can limit independence and increase reliance on caregivers. Its design combines ergonomic and anthropometric principles with a three-bar linkage, ball screw drive, scissor-lift structure, force-balancing mechanism and optimised gear ratio. The source presents this as a proposed manual design operating without electrical actuators.
Engineering assessment
Finite element analysis estimated maximum frame deformation of 2.2 millimetres and a factor of safety of 2.5 under a static 120-kilogram load. The researchers describe these results as validating the design’s structural performance, although the supplied record is a study summary rather than a full-paper review. Human testing involved 25 participants: 15 wheelchair users and 10 healthy volunteers.
Reported performance
During testing, the average sit-to-stand transition took 9.5 ± 1.8 seconds, and 90% of participants achieved independent standing. Force analysis estimated operating force at approximately 10 newtons, representing a reported 45.6% reduction in user effort. The wheelchair received a mean System Usability Scale score of 86.3 out of 100. Clinical evaluation occurred under physiotherapist supervision using standardised functional assessment protocols.
