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Design of Columns under a Centric Load01:17

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The design of columns under centric load is a fundamental aspect of structural engineering and is critical for ensuring the stability and integrity of structures. Euler's and Secant's formulas are central to understanding and calculating the critical load and deformation behaviors of columns, providing a basis for safe and effective structural design.
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Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
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Optimized mitral annuloplasty ring design reduces loading in the posterior annulus.

Beatrice E Ncho1, Eric L Pierce1, Charles H Bloodworth1

  • 1The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Ga.

The Journal of Thoracic and Cardiovascular Surgery
|July 6, 2019
PubMed
Summary

A novel annuloplasty ring with regional flexibility significantly reduced suture forces in ovine models. This design shows promise for reducing suture loading while maintaining annular remodeling capabilities.

Keywords:
mitral annuloplastymitral regurgitationmitral repairring dehiscencesuture forces

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Surgery
  • Medical Device Development

Background:

  • Annuloplasty rings are crucial in treating mitral valve regurgitation.
  • Current annuloplasty rings are either fully rigid or fully flexible, each with limitations.
  • Reducing suture force is essential to minimize tissue damage and improve repair durability.

Purpose of the Study:

  • To develop and evaluate a novel annuloplasty ring with regional flexibility.
  • To compare the suture force dynamics of this new ring against fully rigid and flexible rings.
  • To assess the potential of this design in reducing suture loading during annuloplasty.

Main Methods:

  • Materially heterogeneous annuloplasty rings were designed with rigid anterior/posterior and flexible commissural segments.
  • Cyclic suture forces (Fc) were measured using instrumented rings in 6 healthy ovine subjects.
  • Suture forces were analyzed at varying left ventricular pressures and compared to fully rigid and flexible rings.

Main Results:

  • The heterogeneous ring demonstrated a 48% reduction in suture force at the commissural region compared to the rigid ring.
  • A 32% reduction in posterior suture force was observed with the heterogeneous ring versus the rigid ring.
  • No significant difference in suture force was found in the anterior region or compared to the flexible ring.

Conclusions:

  • The novel heterogeneous annuloplasty ring effectively reduces suture forces in specific regions compared to rigid rings.
  • This design offers a potential method to decrease suture loading while preserving annular remodeling.
  • Further investigation in diseased subjects is warranted to determine repair effectiveness.