Hyperelastic material models for simulating deformation of silicone ring pessaries.

Autor: Wanuch KM; Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Ave W, Waterloo, ON, N2L 3G1, Canada., Blokker A; Cosm Medical Corp., 101 College St, Toronto, ON, M5G 1L7, Canada., Kalami H; Cosm Medical Corp., 101 College St, Toronto, ON, M5G 1L7, Canada., Hong CX; Department of Obstetrics & Gynecology, University of Michigan, L4001 Women's Hospital, 1500 East Medical Center Drive, Ann Arbor, MI, 48109-0276, USA., McLachlin SD; Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Ave W, Waterloo, ON, N2L 3G1, Canada. Electronic address: stewart.mclachlin@uwaterloo.ca.
Jazyk: angličtina
Zdroj: Journal of the mechanical behavior of biomedical materials [J Mech Behav Biomed Mater] 2024 Nov; Vol. 159, pp. 106686. Date of Electronic Publication: 2024 Aug 09.
DOI: 10.1016/j.jmbbm.2024.106686
Abstrakt: Pessaries are removable gynecological prosthetic devices that provide mechanical support for temporary or long-term symptom relief of pelvic floor disorders, such as pelvic organ prolapse and stress urinary incontinence. To date, limited mechanical tests have been performed on physical pessary designs to characterize their behaviour under load; however, custom pessary manufacturing is expensive and time consuming. As an alternative, finite element (FE) modeling can provide detailed numerical insight into the response of a pessary design under load but to date has seen limited application, with little data available for pessary silicone materials. This study aimed to identify hyperelastic material models for two silicone materials used in custom pessary cocoon moulded manufacturing towards FE analysis of ring with support (RWS) pessaries. It was hypothesized that hyperelastic material models could be identified to capture the force and deformation response of multiple RWS sizes under different boundary conditions and silicone materials (Shore 60A and 40A). To understand the material characteristics of pessary silicone, uniaxial tension and compression tests were performed then the experimental data was fit with Mooney-Rivlin (MR) material models. To ensure the material models characterize the pessary behaviour, data from mechanical tests representing the RWS pessary folding and modified 3-point bending were compared to FE recreations (FEBio) of the same tests with the MR materials applied to the pessaries. The FE model results demonstrated good agreement in the force-displacement response for the fold and 3-point bending models for different pessary sizes and silicone stiffnesses. This work demonstrates the hyperelastic material models' efficacy and will enable future studies to improve biomechanical analysis of silicone pessary designs.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests:Kyra Wanuch reports financial support, equipment, drugs, or supplies, and writing assistance were provided by Cosm Medical Corp. Alexandra Blokker reports a relationship with Cosm Medical Corp. That includes: employment. Hamed Kalami reports a relationship with Cosm Medical Corp. That includes: employment. Christopher X. Hong reports a relationship with Cosm Medical Corp. That includes: consulting or advisory. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024. Published by Elsevier Ltd.)
Databáze: MEDLINE
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