MEMS-Based Flexible Force Sensor for Tri-Axial Catheter Contact Force Measurement.
MEMS-Based Flexible Force Sensor for Tri-Axial Catheter Contact Force Measurement.
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DOI：
10.1109/jmems.2016.2636018
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发表时间：
2017-02
期刊：
影响因子：
--
通讯作者：
Desai JP
中科院分区：
文献类型：
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作者：
Pandya HJ;Sheng J;Desai JP
心房颤动（AFib）是由肺静脉（pv）电信号不均匀和快速放电引起的重要的医疗问题。射频消融技术可以通过消融pv内的心肌套管来阻断这些异常电信号。射频消融期间的导管接触力测量可以降低心房纤颤的复发率，因为它有助于确定导管与组织的有效接触，从而产生有效的消融功率输送。本文介绍了一种三维力传感器的研制，用于实时测量三轴导管接触力。三维力传感器由一个塑料立方头和五个柔性力传感器组成。每个柔性力传感器由PEDOT:PSS应变片和柔性PDMS基板上的PDMS凸起组成。校准结果表明，所制备的传感器在射频烧蚀所需的力范围内具有线性响应。为了评估其工作性能，制造的传感器被微操作器压在明胶组织上，并集成在导管尖端上，在去离子水流动中进行测试。两个实验均模拟了心室环境，验证了三维力传感器在射频消融中的有效性。
Atrial fibrillation (AFib) is a significant healthcare problem caused by the uneven and rapid discharge of electrical signals from pulmonary veins (PVs). The technique of radiofrequency (RF) ablation can block these abnormal electrical signals by ablating myocardial sleeves inside PVs. Catheter contact force measurement during RF ablation can reduce the rate of AFib recurrence, since it helps to determine effective contact of the catheter with the tissue, thereby resulting in effective power delivery for ablation. This paper presents the development of a three-dimensional (3D) force sensor to provide the real-time measurement of tri-axial catheter contact force. The 3D force sensor consists of a plastic cubic bead and five flexible force sensors. Each flexible force sensor was made of a PEDOT:PSS strain gauge and a PDMS bump on a flexible PDMS substrate. Calibration results show that the fabricated sensor has a linear response in the force range required for RF ablation. To evaluate its working performance, the fabricated sensor was pressed against gelatin tissue by a micromanipulator and also integrated on a catheter tip to test it within deionized water flow. Both experiments simulated the ventricular environment and proved the validity of applying the 3D force sensor in RF ablation.