This blog post explores the principles and types of upper limb strength assistive devices, examining how these devices improve daily life for people with disabilities and the elderly who have weak arm strength.
A special device was created overseas for a young girl. Due to a rare disease, this girl suffered from significantly weakened arm strength, leaving her unable to move her arms freely. To address this issue, a university overseas used a 3D printer to create a customized upper limb strength assistive device for her. Thanks to this device, the girl can now perform everyday activities previously unimaginable and is actively participating in kindergarten alongside her peers.
So, what exactly is this upper limb strength assistive device? First, upper limb strength refers to the strength in the area between the shoulder and wrist, essentially the strength of the arm. Upper limb strength is essential for lifting arms, grasping objects, and performing various movements in daily life. However, individuals with disabilities or the elderly who have weakened upper limb strength due to illness often face significant difficulties performing these basic actions. Upper limb strength assistive devices were developed to address this problem.
An upper limb strength assistive device is a device that assists upper limb strength, helping the user move their arms as intended. For example, it compensates for weakened arm strength to support daily activities, thereby enabling users to enjoy a better quality of life. These upper limb strength assistive devices can be used in various ways: attached to a wheelchair, fixed to a desk, or worn on the body. This allows users to move their arms in the optimal way depending on the situation.
Upper limb strength assistive devices are broadly categorized into passive and active types. Passive devices primarily use springs or rubber bands to move the arm in the direction the user intends. These devices do not require external power and operate naturally in response to the user’s movements. In contrast, active upper limb strength assist devices use motors instead of springs or rubber bands to move the arm. Active devices enable more precise manipulation using motor force and allow adjustment of the arm’s position via separate switches.
Upper limb power assist devices were initially developed for people with disabilities or the elderly, but they can also be useful in various other fields. For example, in logistics warehouses, they help workers who frequently lift heavy objects by reducing the weight burden, enabling more efficient and safer work. Additionally, dentists can use passive upper limb power assist devices to provide treatment comfortably for extended periods without straining their arms.
Overseas, research on these upper limb strength assistive devices is already actively underway, and they have reached a level of commercialization where they can be easily purchased online. Particularly in the US and Europe, various companies have commercialized these devices and supply them to numerous consumers. In contrast, in Korea, while research on upper limb strength assistive devices continues at institutions like Seoul National University, Hanyang University, and Sogang University, significant time is still required for commercialization. This also reflects the current lack of sufficient social attention and support for people with disabilities or the elderly in Korea. In light of this, we must now dedicate more attention and support to the elderly and disabled individuals within our society. Technologies like upper limb assistive devices should be more widely disseminated so that more people can benefit.
Finally, the development and dissemination of upper limb strength assistive devices represent more than mere technological progress; they are an expression of care and concern for the socially vulnerable. They perform a vital social role, not just by providing technical solutions, but by improving the quality of life for these individuals and enabling independent living. We hope this technology continues to advance and help more people in the future.
