Implantable sensors can be used to monitor biomechanical strain continuously. However, three key challenges need to be addressed before they can be of use in clinical practice: the structural mismatch between the sensors and tissue or organs should be eliminated; a practical suturing attachment process should be developed; and the sensors should be equipped with wireless readout. Here, we report a wireless and suturable fibre strain-sensing system created by combining a capacitive fibre strain sensor with an inductive coil for wireless readout. The sensor is composed of two stretchable conductive fibres organized in a double helical structure with an empty core, and has a sensitivity of around 12. Mathematical analysis and simulation of the sensor can effectively predict its capacitive response and can be used to modulate performance according to the intended application. To illustrate the capabilities of the system, we use it to perform strain measurements on the Achilles tendon and knee ligament in an ex vivo and in vivo porcine leg.

植入式传感器可用于连续监测生物力学应变。然而，在将它们用于临床实践之前，需要解决三个关键挑战：应消除传感器与组织或器官之间的结构不匹配；应开发实用的缝合连接工艺；传感器应配备无线读数。在这里，我们报告了一种无线和可缝合的光纤应变传感系统，该系统通过将电容式光纤应变传感器与用于无线读出的感应线圈相结合而创建。该传感器由两根可拉伸的导电纤维组成，具有空芯的双螺旋结构，灵敏度约为 12。传感器的数学分析和仿真可以有效地预测其电容响应，并可用于根据预期应用调节性能。为了说明该系统的功能，我们使用它对离体和体内猪腿的跟腱和膝关节韧带进行应变测量。