面向肠道平滑肌的微弱肌张力测试系统设计  

Design of Micro Muscle Tension Testing System Based on Intestinal Smooth Muscle

作　　者：倪伟杰 郭旭东[1] 陈杰[2] NI Weijie;GUO Xudong;CHEN Jie(School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Department of Pediatric Surgery,Xinhua Hospital Affiliated To Shanghai Jiao Tong University School of Medicine Shanghai 200092,China)

机构地区：[1]上海理工大学健康科学与工程学院,上海200093 [2]上海交通大学医学院附属新华医院小儿外科,上海200092

出　　处：《传感技术学报》2023年第12期1988-1992,共5页Chinese Journal of Sensors and Actuators

基　　金：上海市自然科学基金面上项目(20ZR1437700);上海介入医疗器械工程技术研究中心项目(18DZ2250900);上海市市级科技重大专项项目(2021SHZDZX);上海市产业协同创新项目(2021-cyxt1-kj07)。

摘　　要：为了研究胃肠道动力异常造成功能性胃肠病的发病机制。面向肠道器官平滑肌设计了一种高精度、高可靠性、重复性好的肌张力测试系统。测试系统主要包括:肌条夹持装置、肌张力放大装置、霍尔式力传感器、信号处理模块、数据处理与显示模块、微处理器、电源模块。为避免肌条夹持过程中预紧力过大导致断裂,而预紧力过小导致测试失效,采用了基于微处理器的自适应肌条夹持方法;肌张力放大装置采用多级杠杆结构,利用柔性铰链作为杠杆支点实现肌张力的放大,对杠杆结构进行有限元分析和优化,杠杆的放大倍数为145;采用霍尔式差分力传感器与信号处理模块对放大后的力进行测量。基于以上原理,开发了测试系统的样机,并完成了性能验证实验。实验可知:测试系统的灵敏度为34.419 V/g,线性度误差为1.627%,重复性误差为0.633%,迟滞性为3.323%。实验结果表明:测试系统能实现0.15 gn量程以内的肌张力测试,且具有较高的测量精度。In order to further research the pathogenesis of functional gastrointestinal diseases caused by abnormal gastrointestinal motility.A smooth muscle tension detection system with high accuracy,high reliability and good repeatability is designed.The detection system mainly includes muscle strip clamping device,muscle tension amplification device,Hall force sensor,signal processing module,data processing and display module,microprocessor,and power module.In order to avoid fracture caused by too large pre-tightening force and measurement failure caused by too small pre-tightening force in the process of muscle strip clamping,an adaptive adjustment method based on microprocessor is adopted to fix the muscle strip.The amplification device of muscle tension adopts multistage lever structure,and the flexible hinge is used as the lever fulcrum to achieve the amplification of muscle tension.The finite element analysis of the designed lever structure shows that the amplification factor of the lever is 145.Then Hall force sensor is used to accurately measure the force after amplification.The multistage circuit is used to complete signal processing.the sensitivity is 34.419 V/g,the linearity is 1.627%,the repeatability error is 0.633%,and the hysteresis is 3.323%.The detection system can accurately measure within 0.15 gn of muscle tension.

关 键 词：生物力学传感器 肠道平滑肌 微弱肌张力测试 多级杠杆放大 差分式霍尔传感器 

分 类 号：TP212.3[自动化与计算机技术—检测技术与自动化装置]