Three-dimensional biomechanical modeling and simulation of trephine cutting cornea for keratoplasty

• Autorzy: Su P. , Lu D. , Deng S. , Zhang L. , Hao Y. , Yang Y.

Identyfikatory

DOI

10.5277/ABB-01080-2018-02

• Języki publikacji: EN

Abstrakty

EN

Trephination is one of the basic operations of keratoplasty, and the biomechanical mechanism of the operation can be revealed based on three-dimensional modeling and simulation of trephine cutting cornea. Methods: Based on the analysis of the physical and biomechanical characteristics of corneal trephination, a three-dimensional numerical model of corneal trephination is built, where the cornea can be simplified to two layers structure including stroma and epithelium, and the trephine cuts the cornea under the vertical motion load and the rotational motion load. A three-dimensional failure criterion of corneal material is proposed based on the yield strength theory. On this basis, trephination simulation is carried out, and the units of corneal material are removed from the model when they meet the defined failure criterion. Results: Under the given parameters including the velocity, the angle and the angular velocity, the trephine force curves, include the linear cutting force and the rotary cutting force are obtained, and show the change of the forces with displacement during the process of trephination simulation. The maps of the equivalent stress show the destruction and deformation of the cornea. Then, the experiment of robotic trephination is carried out under the same parameters and the effectiveness of the simulation is evaluated. Conclusions: Based on mechanics theory and finite element method, the process of trephine cutting cornea has been reproduced, and the interaction mechanism is revealed, which lays the foundation for the development of real-time simulation and virtual system of the corneal surgery.

Słowa kluczowe

EN

cornea; biomechanics; failure criterion; finite element simulation

PL

rogówka; biomechanika; kryterium wytężeniowe; FEM

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Acta of Bioengineering and Biomechanics
• Rocznik: 2018
• Tom: Vol. 20, no. 2
• Strony: 23--33
• Opis fizyczny: Bibliogr. 30 poz., rys., tab., wykr.

Twórcy

autor

Su P.

• School of Electromechanical Engineering, Beijing Information Science and Technology University, Beijing, China
• Key Laboratory of Rehabilitation Aids Technology and System of the Ministry of Civil Affairs, National Research Center for Rehabilitation Technical Aids, Beijing, China

autor

Lu D.

• School of Electromechanical Engineering, Beijing Information Science and Technology University, Beijing, China

autor

Deng S.

• Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Capital Medical University, Beijing, China

autor

Zhang L.

• College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, China

autor

Hao Y.

• School of Electromechanical Engineering, Beijing Information Science and Technology University, Beijing, China

autor

Yang Y.

• School of Mechanical Engineering and Automation, Beihang University, Beijing, China

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).