Using a smart insole to mitigate workplace slips and falls

Researchers have developed a shoe insole that is embedded with pressure and motion sensors, helping to identify high-risk areas and mitigate workplace incidents in real time.

Slips, trips and falls (STFs) are one of the top causes of major injuries in the workplace. According to the International Labour Organization, more than one million workers globally are injured at work on a daily basis, with slips and trips being the primary causes.

Timely detection of STF risks is crucial in helping to enhance workplace safety and health, particularly in industries such as construction, maritime, manufacturing, and transportation and storage.

Professor Lim Chwee Teck from the National University of Singapore’s (NUS) Department of Biomedical Engineering, as well as Institute for Health Innovation & Technology (iHealthtech), collaborated with NUS startup FlexoSense to develop the smart insole, which can detect a person’s balance. The insole will allow companies to identify the location of an incident and highlight STF risk areas in order to implement suitable mitigation measures.

The smart insole comprises pressure sensors to track foot pressure and an inertial measurement unit sensor to measure changes in motion. When an STF occurs, the body will initially try to maintain balance by exerting pressure on the feet to break the STF. The smart insole can pick up these changes in pressure exerted by the feet, and a person’s orientation, to determine if an STF has occurred. Such changes in foot pressure and motion due to an STF are then recorded and measured in real time to generate balance profiles of different users, which could help in assessing the deployment of workers for various tasks. Additionally, falls from height can be detected by the smart insole as they have distinct velocity profiles compared to falls on level ground.

A side view of the insole, which has a charging port.

Information gathered from the smart insole can be easily accessed by workers through a mobile application and by company management via a dashboard. The digitalisation of STF occurrences facilitates timely reporting and greater transparency on these incidents, instead of relying on workers or safety officers to file manual reports. The insole can also be custom-fitted where necessary via foot scanning and subsequent 3D printing production.

“Usually, slips, trips and falls are unreported. By deploying this smart insole solution in the workplace, companies can be proactive in mitigating these incidents. When a person encounters a slip, trip or fall, there will be unique changes in motion as well as pressure distribution exerted by the feet. Our smart insole captures the information automatically, and by tracking these changes, companies can identify high-risk areas in the workplace and implement preventive measures in a timely manner,” Lim said.

“STFs are significant cost drivers for most companies due to a loss of productivity, medical expenses and administrative costs. We believe our smart insole can help to reduce the human and financial costs before serious accidents happen,” said Chia Lye Peng, Chief Executive Officer of FlexoSense.

Beyond monitoring and reporting STFs, the smart insole recognises daily activities including walking, standing and sitting, allowing managers to identify potential risky actions such as when a worker should be walking instead of running, and to measure centre of pressure to assess each worker’s sense of balance.

Over time, the data collected from the smart insoles worn by workers, along with other worker-related metrics, can be used to implement best workplace practices on safety and health. The team is also looking into future applications and commercialisation of the smart insole to mitigate STFs in construction, aviation, manufacturing and other industries.

Top image credit: iStock.com/Fertnig