there are increasing studies that proposed Auxetic structures as novel stents? what the contributions of materials and structures with negative Poisson's ratio? does it it due to matching between the auxetic behaviour and the tissue behaviour of blood vessels ?
Dear Amer,
Auxetic stents are flexible tubes which have a self-expandible structure. They are gadgets that get wider when pulled apart and form a hollow tube to open up narrowed arteries.
Auxetic stents have many medical applications. Vascular stents can be inserted into narrowed blood vessels for restoring the blood flow and maintaining the functions of blood circulation system.
Esophageal stents keep open a blocked area in esophagus (throat) which might be caused by cancer. The tube helps the patient swallow solids and liquids without pain.
Coronary stents are used to open clogged heart arteries. This can improve symptoms of blocked arteries, such as chest pain and shortness of breath.
To better understand how the auxeticity (property of having a negative Poisson ratio) helps the mechanism of these stents, you can refer to links below:
https://www.youtube.com/watch?v=t-zCBKRg7Cs
https://www.youtube.com/watch?v=h3UFsHZD0Ho
Hi,
Due to the negative Poisson's ratio, a stent with this structure has the capability to adapt itself to severe conditions.
From the mechanical point of view, harmonic loading which is happened during the blood pumping could be one of these conditions and studies show that these structures have more durability rather than regular stents.
Another condition has happened during the setup of these stents. As you know vessel makes pressure on the stent, so a stent with a negative Poisson's ratio especially in the radial direction could release this pressure which produces from the vessel and the auxetic stent has better performance in this situation.
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