Grip strength is an important indicator of health conditions and needs to be monitored for health management. However, different populations (e.g., babies and rehabilitation patients) have different hand sizes and different levels of grip strengths, requiring a personalized sensor to monitor grip strength. In this paper, we developed a smart ball sensor by laser kirigami of graphene for personalized grip strength monitoring. To realize the rational utilization of space, a transparent pill shell embedding all electronic accessories is installed in the center of the ball sensor with a spiral-sensing unit fabricated by laser kirigami of graphene on the surface. Furthermore, we assessed the influence of contact area between hand and ball on grip strength using finite-element analysis (FEA), which was then considered in our results readout. The grip strength can be continuously read by a mobile phone in a wireless manner. The smart ball sensor demonstrated a high performance in vitro against gold-standard method in diseased and healthy subjects. It would be a powerful tool for personalized long-term monitoring of grip strength, especially suitable for specific populations such as babies and sensitive enough for samll grip strength.

握力是健康状况的重要指标，需要进行健康管理监测。然而，不同的人群（例如婴儿和康复患者）有不同的手大小和不同水平的握力，需要个性化的传感器来监测握力。在本文中，我们通过石墨烯的激光剪纸开发了一种智能球传感器，用于个性化握力监测。为了实现空间的合理利用，在球体传感器的中心安装了一个嵌入所有电子配件的透明药丸外壳，表面有一个由石墨烯激光剪纸制成的螺旋感应单元。此外，我们使用有限元分析 (FEA) 评估了手和球之间的接触面积对握力的影响，然后在我们的结果读数中加以考虑。握力可以通过手机以无线方式连续读取。智能球传感器在体外针对患病和健康受试者的金标准方法展示了高性能。这将是个性化长期监测握力的强大工具，特别适用于婴儿等特定人群，并且对小握力足够敏感。