Simulation of artificial anal sphincter motion and interaction with intestinal environment using SOFA.

Publisher: Wiley-Blackwell Country of Publication: United States NLM ID: 7802778 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1525-1594 (Electronic) Linking ISSN: 0160564X NLM ISO Abbreviation: Artif Organs Subsets: MEDLINE

Publication: Cambridge, MA : Wiley-Blackwell
Original Publication: Cleveland, International Society for Artificial Organs.

Urinary Sphincter, Artificial* ; Fecal Incontinence*/surgery ; Artificial Organs*; Humans ; Anal Canal/surgery ; Prostheses and Implants

Background: Artificial anal sphincter is an implantable medical device for treating fecal incontinence. Reasonable simulation facilitates the advancement of research and reduces experiments on biological tissue. However, the device's clamping motion and sensor interaction with the intestine in the simulation still require further exploration. This article presents a simulation of the artificial anal sphincter's clamping and sensing and its interaction with the intestinal environment using the Simulation Open Framework Architecture (SOFA).
Methods: Firstly, the proposed simulation algorithm and its principles in SOFA are analyzed. Secondly, the clamping motion and sensor system of the artificial anal sphincter are simulated. Thirdly, a finite element model of intestine is established based on the properties of intestinal soft tissue. Finally, the in vitro experiments are performed.
Results: The simulation results indicate that the sensor system of the artificial anal sphincter has good sensing performance during the clamping motion and fecal accumulation process. Experiments have shown that optimal sensory capabilities can be achieved as the posture of the artificial anal sphincter with a roll angle between 20° and 40°. The comparison demonstrates a mean absolute error of 10%-20% between simulation and in vitro experimental results for sensor forces, which verifies the effectiveness of the simulation.
Conclusion: The proposed novel simulation achieves a more comprehensive interaction between the artificial anal sphincter motion and intestinal environment. This study may provide more effective simulation data for guidance in improving the performance of sensor perception of artificial anal sphincter for further research.
(© 2023 International Center for Artificial Organ and Transplantation (ICAOT) and Wiley Periodicals LLC.)

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National Natural Science Foundation of China; Science and Technology Commission of Shanghai Municipality

Keywords: artificial anal sphincter; interaction phenomenon; sensor perception; simulation open framework architecture; soft tissue modeling

Date Created: 20230908 Date Completed: 20231115 Latest Revision: 20231122

20250114

10.1111/aor.14632

37680050