Finite Element Modeling of Ankle Joint Replacement Incorporating Subject-Specific Soft Tissue Constraints for Prediction of Intercomponent Motion and Loading

2004 ◽  
Author(s):  
Terence E. McIff ◽  
Greg A. Horton
Keyword(s):  
Finite Element ◽  
Soft Tissue ◽  
Finite Element Modeling ◽  
Joint Replacement ◽  
Gait Cycle ◽  
Element Modeling ◽  
Modeling Methods ◽  
Ankle Replacement ◽  
Subject Specific ◽  
Replacement Device

This paper describes the use of finite element modeling methods to predict intercomponent sliding, rotation, constraint, and contact mechanics in a total ankle replacement device. Ligaments are modeled to constrain motion occurring during physiologic loading and articulation over a full gait cycle.

scholarly journals Modeling and Characteristic Analysis of Wireless Ultrasonic Vibration Energy Transmission Channels through Planar and Curved Metal Barriers

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
DingXin Yang ◽  
BaoJian Hou ◽  
Dong Tian ◽  
Siyuan Wang
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Modeling Method ◽  
Circuit Modeling ◽  
Energy Transmission ◽  
Element Modeling ◽  
Modeling Methods ◽  
Equivalent Circuit Modeling ◽  
Dimensional Finite Element ◽  
Metal Barrier

Wireless ultrasonic vibration energy transmission systems through metal barriers based on piezoelectric transducers have drawn a lot of focus due to the advantage of nonpenetration of the barriers, thus maintaining the integrity of sealed structures. It is meaningful to investigate appropriate modeling methods and to characterize such wireless ultrasonic energy transmission channels with different geometric shapes. In this paper, equivalent circuit modeling and finite element modeling methods are applied to the planar metal barrier channel, and a 3-dimensional finite element modeling method is applied to the cylindrical metallic barrier channel. Meanwhile, the experimental setup is established and measurements are carried out to validate the effectiveness of the corresponding modeling methods. The results show that Leach’s equivalent circuit modeling method and finite element modeling method are nearly similarly effective in characterizing the planar metal barrier channel. But for a cylindrical metal barrier, only the three-dimensional finite element modeling method is effective. Furthermore, we found that, for the planar barrier, the effect of standing waves on the efficiency of wireless energy transmission is dominated. But for the curved barrier, only the resonant phenomenon of the piezoelectric transducer exists.

Finite element modeling of a disc nucleus replacement device

2015 ◽  
Vol 26 (2) ◽  
pp. S41
Author(s):  
J. Coogan ◽  
T. Eliason ◽  
D. Nicolella ◽  
N. Hibri ◽  
J. Lutz
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Element Modeling ◽  
Replacement Device

Subject-specific finite-element modeling of normal aortic valve biomechanics from 3D+t TEE images

2015 ◽  
Vol 20 (1) ◽  
pp. 162-172 ◽  
Author(s):  
Michel R. Labrosse ◽  
Carsten J. Beller ◽  
Munir Boodhwani ◽  
Christopher Hudson ◽  
Benjamin Sohmer
Keyword(s):  
Finite Element ◽  
Aortic Valve ◽  
Finite Element Modeling ◽  
Element Modeling ◽  
Subject Specific

scholarly journals Three-dimensional finite element modeling for evaluation of laryngomalacia severity in infants and children

2020 ◽  
Vol 48 (6) ◽  
pp. 030006052092640
Author(s):  
Hongming Xu ◽  
Jiali Chen ◽  
Shilei Pu ◽  
Xiaoyan Li
Keyword(s):  
Finite Element ◽  
Soft Tissue ◽  
Finite Element Model ◽  
Finite Element Modeling ◽  
Three Dimensional ◽  
Element Model ◽  
3D Finite Element ◽  
Element Modeling ◽  
Laryngeal Cartilage ◽  
Computed Tomography Images

This study was performed to investigate the feasibility of using a three-dimensional (3D) finite element model for laryngomalacia severity assessment. We analyzed laryngeal computed tomography images of seven children with laryngomalacia using Mimics software. The gray threshold of different tissues was distinguishable, and a 3D visualization model and finite element model were constructed. The laryngeal structure parameters were defined. The peak von Mises stress (PVMS) value was obtained through laryngeal mechanical analysis. The PVMS values of the laryngeal soft tissue and cartilage scaffolds were independently correlated with disease severity. After stress loading the model, the relationship between laryngomalacia severity and the PVMS value was apparent. However, the PVMS value of laryngeal soft tissue was not correlated with laryngomalacia severity. This study established the efficacy of a finite element model to illustrate the morphological features of the laryngeal cavity in infants with laryngomalacia. However, further study is required before widespread application of 3D finite element modeling of laryngomalacia. PVMS values of the laryngeal cartilage scaffold might be useful for assessment of laryngomalacia severity. These findings support the notion that structural abnormalities of the laryngeal cartilage may manifest as quantifiable changes in stress variants of the supraglottic larynx.

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