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Smart Structures and Systems
  Volume 8, Number 1, July 2011 , pages 1-15

Bio-inspired leaf stent for direct treatment of cerebral aneurysms: design and finite element analysis
Xiang Zhou, Zhong You and James Byrne, M.D.

    Cerebral aneurysm is common lesion among adult population. Current methods for treating the disease have several limitations. Inspired by fern leaves, we have developed a new stent, called leaf stent,which can provide a tailored coverage at the neck of an aneurysm and thus prevent the blood from entering the aneurysm. It alone can be used to treat the cerebral aneurysm and therefore overcomes problems existing in current treating methods. The paper focuses on the numerical simulation of the leaf stents. The mechanical behaviour of the stent in various designs has been investigated using the finite element method. It has been found that certain designs provide adequate radial force and have excellent longitudinal flexibility. The performance of certain leaf stents is comparable and even superior to those of the commercially available cerebral stents such as the Neuroform stent and the Enterprise stent, commonly used for stent assisted coiling, while at the same time, providing sufficient coverage to isolate the aneurysm without using coils.
Key Words
    cerebral aneurysm; leaf stent; nitinol; FEA (or finite element analysis); radial force; longitudinal flexibility; stent-artery interaction.
Xiang Zhou and Zhong You: 1Department of Engineering Science, University of Oxford, UK, OX3 7DQ
James Byrne, M.D.: Department of Neuroradiology, Nuffield Department of Surgery, University of Oxford, UK, OX3 9DU

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