Design and Experimental Verification of
 a Novel Puborectalis-Like Artificial Anal Sphincter

doi:10.16183/j.cnki.jsjtu.2019.10.002

Abstract

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

CLC Number:

LU Shan,WANG Zhiwu,YAN Guozheng,ZHOU Zerun. Design and Experimental Verification of a Novel Puborectalis-Like Artificial Anal Sphincter[J]. Journal of Shanghai Jiaotong University, 2019, 53(10): 1151-1158.

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Design and Experimental Verification of a Novel Puborectalis-Like Artificial Anal Sphincter

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