On the validation of patient-specific numerical simulations of the TEVAR procedure
Procedia Structural Integrity(2023)
Abstract
The Thoracic Endovascular Aortic Repair (TEVAR) is becoming the first choice to treat thoracic aortic pathologies (e.g., aneurysms, ulcerations, and dissections) in a minimally invasive way. It consists of placing a self-expandable stent-graft into the pathological region to recreate a more physiological condition. When computational models are used in this clinical context to predict procedural results, their credibility should be validated and verified. This works applies a validated finite element methodology to four patient-specific anatomies. Different sizes of a commercial stent-graft model are recreated, and the TEVAR simulation results are validated by comparing them to post-operative Computed Tomography images. Errors between simulation and segmentation are lower than 10% for the stent struts opening area. This study also evaluates and discusses numerical quantities (contact pressures, device-to-vessel distances, and stress distributions) associated with potential TEVAR complications such as device migration and bird beak phenomenon. This work aims at demonstrating how a fully validated methodology is useful for clinicians to identify the best treatment for the patient before the intervention to avoid device-related complications.
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Key words
tevar procedure,numerical simulations,patient-specific
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