Optics and Precision Engineering, Volume. 29, Issue 11, 2640(2021)

Design and optimization of an artificial anal sphincter clamping mechanism

Chuan-ye CHAI1...2, Guo-zheng YAN1,2,*, Ding HAN1,2, Kai ZHAO1,2, and Fang-fang HUA12 |Show fewer author(s)
Author Affiliations
  • 1School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai200240, China
  • 2Institute of Medical Robotics, Shanghai Jiao Tong University, Shanghai0040, China
  • show less

    The existing artificial anal sphincter clamping mechanism has the disadvantages of low biocompatibility and long response time. Based on the defecation mechanism and physiological structure, this paper discusses the design of a Novel Closed-link Artificial Anal Sphincter (NCAAS) clamping mechanism. The NCAAS clamping mechanism consists of three sets of interlaced clamping arms and a transmission mechanism based on groove cam swing rods. To study its biocompatibility and response time, the clamping force equation of the clamping arm was derived from the principle of virtual work, and the processing of the finite element in instantaneous dynamic simulation. During simulated stool control, the maximum clamping force of the NCAAS is 1.6 N, and the anorectal angle is in the range of 62.2°~95.2°, which meets the demands of human daily stool control mass. The weight of the NCAAS prototype is 55.19 g, with a height of 42.7 mm and length of 68.2 mm. The response time of the improved system is 7.25 s. An in vitro experiment with a pig colon verified the biocompatibility of the NCAAS, which draws the result of a 700 g controlled stool mass at an anorectal angle of less than 90°. The NCAAS is small and light, with better biocompatibility and a response time that is significantly shorter than that of traditional artificial anal sphincters.

    Tools

    Get Citation

    Copy Citation Text

    Chuan-ye CHAI, Guo-zheng YAN, Ding HAN, Kai ZHAO, Fang-fang HUA. Design and optimization of an artificial anal sphincter clamping mechanism[J]. Optics and Precision Engineering, 2021, 29(11): 2640

    Download Citation

    EndNote(RIS)BibTexPlain Text
    Save article for my favorites
    Paper Information

    Category: Micro/Nano Technology and Fine Mechanics

    Received: Mar. 5, 2021

    Accepted: --

    Published Online: Dec. 10, 2021

    The Author Email: YAN Guo-zheng (gzhyan@sjtu.edu.cn)

    DOI:10.37188/OPE.20212911.2640

    Topics