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Related Concept Videos

Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

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Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
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Eccentric Axial Loading in a Plane of Symmetry01:16

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Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
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Related Experiment Video

Updated: Nov 12, 2025

Modified Octopus Technique for Thoracoabdominal Aortic Aneurysm
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Thoracic aortic parallel stent-graft behaviour when subjected to radial loading.

Jakub Kwiecinski1, Christopher P Cheng2, Raman Uberoi3

  • 1Department of Engineering Science, University of Oxford, Oxford, UK.

Journal of the Mechanical Behavior of Biomedical Materials
|March 19, 2021
PubMed
Summary

Parallel endografting, or chimney thoracic endovascular aortic repair (ch-TEVAR), increases radial loads and causes significant device deformations. Device choice and configuration impact these mechanical interactions, crucial for complex aortic arch disease management.

Keywords:
Chimney graftDissectionEndograftEndoleakEndovascular repairGutterNitinolParallel graftRadial forceStent testingStent-graftTEVARThoracic aortic aneurysm

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Surgery
  • Medical Device Technology

Background:

  • Minimally invasive techniques for complex aortic arch disease often involve parallel stent-graft deployment.
  • The biomechanical interactions during chimney thoracic endovascular aortic repair (ch-TEVAR) are not fully understood.

Purpose of the Study:

  • To characterize the loading and deformation behavior of parallel endografts in representative ch-TEVAR configurations.
  • To evaluate device-device and device-artery interactions in parallel endografting.

Main Methods:

  • Utilized a radial force testing system to quantify loading profiles of four commercial endografts (Bentley BeGraft, Gore TAG, Gore Viabahn, Medtronic Valiant).
  • Tested devices individually and in six parallel combinations.
  • Analyzed image data to assess mechanical deformations including gutters, compression, and infolding.

Main Results:

  • Parallel endografting significantly increased radial loads compared to standard TEVAR.
  • Outward force varied by main endograft manufacturer (TAG combinations > Valiant combinations) but was independent of chimney graft type.
  • Endograft deformations differed by chimney graft type (Viabahn resulted in less gutter area and more lumen compression than BeGraft).
  • Chimney graft deformations were influenced by deployment arrangement in double ch-TEVAR.

Conclusions:

  • Significant variability exists in radial loads and mechanical deformations among clinically relevant ch-TEVAR configurations.
  • Device selection and configuration critically influence biomechanical outcomes in ch-TEVAR.
  • Further understanding of these interactions is essential for optimizing treatment of complex aortic arch disease.