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Related Concept Videos

Heart Valves01:16

Heart Valves

15.6K
The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
15.6K

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Transplantation of Pulmonary Valve Using a Mouse Model of Heterotopic Heart Transplantation
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A Hybrid Tissue-Engineered Heart Valve.

S Hamed Alavi1, Arash Kheradvar1

  • 1Department of Biomedical Engineering, University of California, Irvine, Irvine, California.

The Annals of Thoracic Surgery
|June 6, 2015
PubMed
Summary
This summary is machine-generated.

This study developed a hybrid tissue-engineered heart valve using a Nitinol mesh scaffold. The novel approach shows promise for creating functional heart valves, potentially overcoming limitations of current degradable scaffolds.

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Area of Science:

  • Biomaterials Engineering
  • Tissue Engineering
  • Cardiovascular Research

Background:

  • Current tissue-engineered heart valves often face challenges with scaffold degradation.
  • Developing robust and functional artificial heart valves remains a critical unmet need in cardiovascular medicine.

Purpose of the Study:

  • To develop and test the first hybrid tissue-engineered heart valve.
  • To create a valve with leaflets composed of a superelastic Nitinol mesh encased in multiple cell types.

Main Methods:

  • Utilized a trileaflet Nitinol mesh scaffold for three-dimensional cell culture.
  • Enclosed the mesh with smooth muscle, fibroblast/myofibroblast cells, and an endothelial cell layer.
  • Performed quantitative and qualitative assays to analyze tissue microstructure.

Main Results:

  • Achieved a tissue composition similar to natural heart valve leaflets.
  • Demonstrated robust opening and closing in a heart flow simulator under physiologic conditions (75% effective orifice area).
  • Confirmed successful tissue-metal attachment under simulated physiologic flow rates.

Conclusions:

  • The hybrid tissue-engineered heart valve approach using a nondegradable scaffold is viable.
  • This method may offer a solution to the limitations of degradable scaffolds in current tissue-engineered valves.