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Alternative blood conduits: assessment of whether the porosity of synthetic prostheses is the key to long-term biofunctionality

  • Cellular Engineering: Tissue Engineering and Biomaterials
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Abstract

The paper examines the effects of water permeability on solid particle (platelet) adhesion and lipid transport through the wall of a blood conduit. Also tested is the capacity of external supports to reduce lipid infiltration into venous grafts. The results indicate that water permeability not only facilitates particle adhesion, but also affects the spatial distribution of the adhesion. The presence of filtration flow leads to a concentration polarisation of atherogenic lipids at the blood/wall interface, with increased lipid concentration from the bulk value towards the interface, thus enhancing the drive potential for lipid infiltration into the vessel wall. An external support to a venous graft guards against excessive distention and significantly reduces lipid infiltration into the venous wall. These results strongly suggest that too high a water permeability or porosity can lead to the late failure of arterial grafting by affecting blood cell interaction with the graft and lipid infiltration into the wall. Therefore the pore structure of an arterial prosthesis is crucial to its long-term biofunctionality. Ideally, a synthetic prosthesis should display pores of adequate size and a structural network that promotes tissue ingrowth, while maintaining water porosity at a physiological level.

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Correspondence to R. Guidoin.

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Deng, X., Guidoin, R. Alternative blood conduits: assessment of whether the porosity of synthetic prostheses is the key to long-term biofunctionality. Med. Biol. Eng. Comput. 38, 219–225 (2000). https://doi.org/10.1007/BF02344780

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