Sit to Stand Gait Trainer: Modulation of Lift Force via Elastic Network

Abstract

Falls in nursing homes and hospitals are common occurrences and a significant problem in the healthcare industry. A large number of accidents occur during sit to stand transitions. Not only patients with lower limb weakness are prone to injury after falls, but the healthcare workers are prone to musculoskeletal injuries when helping individuals transitioning from sitting to a standing position. Sit to stand devices are currently being used in hospitals, but the current models are expensive and do not allow patients to use any of their lower body strength in the process. We proposed the design of a device adjustable to each user in order to maximize the use of their own strength and allow them to stand up comfortably and safely. The design is innovative, customizable, and enables the device to be used as a walker as well. We propose an actuation system that combines a set of elastic bands to modulate the force used for lifting and gravity compensation. The system comprises of two sets of rubber bands that can modulate the force profile as a function of the height of the seat. Furthermore, this device offers a potential solution to the disproportionate number of workers injured in the healthcare field during lifting and assisting patients during the sit to stand transition.