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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.
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Related Experiment Video

Updated: Jan 23, 2026

Four-Dimensional Computed Tomography-Guided Valve Sizing for Transcatheter Pulmonary Valve Replacement
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Tissue-engineered transcatheter vein valve.

Zeeshan H Syedain1, Anders C Jenson1, Puja S Patel1

  • 1Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN, USA.

Biomaterials
|June 14, 2019
PubMed
Summary
This summary is machine-generated.

A novel tissue-engineered vein valve (TEVV) shows promising function and durability for treating chronic venous insufficiency. This regenerative approach offers a potential solution for patients with chronic leg ulcers and amputation risk.

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Tissue Engineering by Intrinsic Vascularization in an In Vivo Tissue Engineering Chamber
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Tissue Engineering by Intrinsic Vascularization in an In Vivo Tissue Engineering Chamber

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Area of Science:

  • Biomaterials Engineering
  • Regenerative Medicine
  • Vascular Surgery

Background:

  • Chronic venous insufficiency affects millions, with limited treatment options for severe cases like chronic leg ulcers.
  • Current surgical valve repair is effective but challenging; a regenerative, transcatheter approach is needed.

Purpose of the Study:

  • To develop and evaluate a novel tissue-engineered transcatheter vein valve (TEVV) for chronic venous insufficiency.
  • To assess the TEVV's hydrodynamic function, durability, and in vivo performance.

Main Methods:

  • A Nitinol stent was embedded in a tissue-engineered matrix grown from fibroblasts in fibrin gel.
  • The matrix was decellularized to create an 'off-the-shelf' collagenous valve, tested in a pulse duplicator and via catheter-based delivery in ovine iliac veins.

Main Results:

  • In vitro tests showed favorable pressure drops (2-4 mmHg), low closing volume, and no regurgitation.
  • The TEVV demonstrated excellent durability after 1 million cycles and withstood over 600 mmHg backpressure.
  • In vivo, the TEVV closed, endothelialized, and remained free of thrombosis within 8 weeks post-implantation.

Conclusions:

  • The developed TEVV exhibits promising hydrodynamic function, hemocompatibility, and durability.
  • This regenerative, transcatheter valve represents a potential advancement in treating chronic venous insufficiency and related complications.