上海交通大学 电子信息与电气工程学院， 上海 200240
出版日期:2019-10-28发布日期:2019-11-01通讯作者:王志武，男, 副研究员，电话（Tel.）：021-34204434；E-mail: zwwang@sjtu.edu.cn.作者简介:鲁姗(1993-)，女，山东省泰安市人，硕士生，主要研究方向为微机电设计和柔性压力传感器设计.基金资助:国家自然科学基金资助项目（61673271，81601631）Design and Experimental Verification of a Novel Puborectalis-Like Artificial Anal Sphincter
LU Shan,WANG Zhiwu,YAN Guozheng,ZHOU ZerunSchool of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Online:2019-10-28Published:2019-11-01摘要/Abstract
摘要： 为模仿耻骨直肠肌牵引直肠形成肛肠角以实现控便，设计了一款基于三环式结构的仿生人工肛门括约肌假体.采用高度集成的减速器将电动机驱动由内向外输出，使用O型圈实现旋转部件的动密封；自制密封性良好的传感器来测量肠壁受力；进行力学性能测试、防水实验和动物实验以验证假体功能.结果表明：假体的总传动效率为49%～59%，输出转矩为 2.04～2.51N·m，单个行程响应时间为10s；柔性压力传感器的输出和其所受压力之间具有良好的线性度；当假体对肠道径向的闭合压力为 6.6kPa时，可在直肠腔内维持98cm高度的水柱不渗漏；假体在经历 4050 次开关运动后仍不发生渗漏；植入假体可有效避免肠吻合术，并可在动物体内进行有效控便、排便.实验结果验证了所设计的仿生人工肛门括约肌假体是一种能有效控便且整体防水性能良好的机电一体化机构.
关键词: 人工肛门括约肌假体； 三环执行器； 柔性肠道压力传感器； 防水； 动物实验
Abstract: In order to treat severe fecal incontinence, a novel puborectalis-like artificial anal sphincter (PAAS) based on three rings is designed to pull and angulate the rectum. The gear box can be fully encapsulated inside the PAAS, and the motor power is transmitted from inside to outside. In addition, a flexible pressure sensor is designed and customized to detect the force exerted on the intestinal wall when the pulling arm pulls the rectum with the O-rings to achieve good waterproof effect. Finally, the mechanical and waterproof properties are assessed, and the animal implantation is conducted. The results indicate that: the final transmission efficiency of PAAS is 49%～59%, the output torque is 2.04～2.51N·m; there is good linearity between the output of flexible pressure sensor and the force exerted on the intestinal wall; PAAS can maintain the intraluminal pressure up to 98cm water column with clamping pressure of 6.6kPa; no leakage occurrs after 4050 movements; the anastomosis can be effectively avoided in implantation and PAAS works effectively in a Sipsongpanna miniature pig model. PAAS proposed in this paper has a good all-round performance of waterproof as well as maintaining continence.
Key words: puborectalis-like artificial anal sphincter; three-ring actuator; flexible pressure sensor; waterproof; animal experiment
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