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Modelling chorded prosthetic mitral valves using the immersed boundary method.

P N Watton1, X Y Luo, R Singleton

  • 1Department of Cardiac Surgery, University of Glasgow, Glasgow, UK.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|February 3, 2007
PubMed
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The Immersed Boundary (IB) method was enhanced for easier modeling of complex leaflet structures and static loading. This improved fluid-structure interaction analysis, particularly for prosthetic heart valves.

Area of Science:

  • Computational fluid dynamics
  • Biomedical engineering
  • Fluid-structure interaction

Background:

  • The Immersed Boundary (IB) method is effective for fluid-structure interactions but has limitations in usability and static load modeling.
  • Accurate modeling of heart valve dynamics is crucial for developing advanced prosthetic devices.

Purpose of the Study:

  • To enhance the Immersed Boundary (IB) method for efficient and user-friendly modeling of multileaflet elastic structures, including chordae and external surface pressure.
  • To enable the simulation of static deformations under steady loads.
  • To validate the improved method for native and prosthetic heart valve models.

Main Methods:

  • Development of an enhanced Immersed Boundary (IB) method capable of modeling complex leaflet structures with chordae and external pressures.

Related Experiment Videos

  • Validation of the method using native mitral valve systolic loading and prosthetic aortic valve static loading.
  • Application to a novel chorded prosthetic mitral valve under physiological flow conditions.

    • Main Results:

    • The enhanced IB method successfully modeled multileaflet structures and static loading, showing qualitative agreement with ANSYS and experimental data.
    • Discrepancies were observed, attributed to the IB method's current inability to model bending and shear effects.
    • The study identified potential crimping issues in the fiber structures of the new prosthetic valve model.

    Conclusions:

    • The enhanced Immersed Boundary (IB) method offers improved capabilities for modeling complex leaflet structures and static loading in fluid-structure interaction.
    • Further development is needed to incorporate bending and shear effects for enhanced accuracy in dynamic and static analyses.
    • The findings provide a foundation for more precise computational modeling of prosthetic heart valves.