This paper presents a novel smart ball sensor for personalized grip strength monitoring, particularly beneficial for diverse populations like babies and rehabilitation patients. The sensor utilizes laser kirigami of graphene to create a spiral-sensing unit on a 3D elastic ball. Electronic components are housed within a central pill shell. Finite-element analysis (FEA) was employed to assess the impact of contact area on grip strength readings, which are wirelessly transmitted to a mobile phone. In vitro testing demonstrated high performance compared to gold-standard methods, suggesting the sensor's potential for personalized long-term grip strength monitoring.

Huiqing Zhang, Xin Ding, Xiongwen Zhang, Feng Xu