A Low-Cost, Versatile, Open-Source, DIY Partial Body-Weight Support Device.

Partial body weight support during gait training and other tasks is a common practice. Approaches using robotic devices allow for a wide range of functions but at great cost and complexity. Based on constant force springs, we have created a low-cost body weight support system from off-the-shelf parts, with no tools required for assembly or maintenance, and it is easily integrated into any overhead support system. The design is presented as open source for future improvements. We evaluated the hysteresis using two different types of constant force springs, comprising clinically relevant levels of weight support, 61.2 N and 131 N. Force constancy during walking was examined. Hysteresis had noticeable effects on weight support, illustrating a potential challenge for future designs with body weight support through constant force springs. By providing the constant weight support, the most common type of body weight support, this device represents an accessible alternative to robotic dynamic body weight support tools.