Fibrous composite material for textile heart valve design: In vitro assessment

Amna Amri, Gaetan Laroche, Nabil Chakfe, Frederic Heim

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

With over 150,000 implantations performed over the world, transcatheter aortic valve replacement (TAVR) has become a surgical technique, which largely competes with open surgery valve replacement for an increasing number of patients. The success of the procedure favors the research toward synthetic valve leaflet materials as an alternative to biological tissues, whose durability remains unknown. In particular, fibrous constructions have recently proven to be durable in vivo over a 6-month period of time in animal sheep models. Exaggerated fibrotic tissue formation remains, however, a critical issue to be addressed. This work investigates the design of a composite fibrous construction combining a woven polyethylene terephthalate (PET) layer and a non-woven PET mat, which are expected to provide, respectively, strength and appropriate topography toward limited fibrotic tissue ingrowth. For this purpose, a specific equipment has been developed to produce non-woven PET mats made from fibers with small diameter. These mats were assembled with woven PET substrates using various assembling techniques in order to obtain hybrid fibrous constructions. The physical and mechanical properties of the obtained materials were assessed and valve samples were manufactured to be tested in vitro for hydrodynamic performances. The results show that the composite fibrous construction is characterized by properties suitable for the valve leaflet function, but the durability of the assembling is however limited under accelerated cyclic loading.

Original languageEnglish (US)
Pages (from-to)221-230
Number of pages10
JournalBiomedizinische Technik
Volume63
Issue number3
DOIs
StatePublished - Jun 27 2018

Keywords

  • TAVR
  • fibrous composite
  • heart valve
  • textile composite
  • textile valve
  • transcatheter valve
  • valve fibrosis

ASJC Scopus subject areas

  • Biomedical Engineering

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