Al-Sukhun Jehad, Lindqvist Christian, Ashammakhi Nureddin, Penttilä Heikki
Department of Oral and Maxillofacial Surgery, Helsinki University Hospital, Kasarmikatu 11-13, PO Box 263, 00029 HUS, Helsinki, Finland.
Br J Oral Maxillofac Surg. 2007 Mar;45(2):130-7. doi: 10.1016/j.bjoms.2005.11.022. Epub 2006 Feb 3.
To develop a finite element model (FEM) to study the effect of the stress and strain, in microvascular anastomoses that result from the geometrical mismatch of anastomosed vessels.
FEMs of end-to-end and end-to-side anastomoses were constructed. Simulations were made using finite element software (NISA). We investigated the angle of inset in the end-to-side anastomosis and the discrepancy in the size of the opening in the vessel between the host and recipient vessels. The FEMs were used to predict principal and shear stress and strain at the position of each node.
Two types of vascular deformation were predicted during different simulations: longitudinal distortion, and rotational distortion. Stress values ranged from 151.1 to 282.4MPa for the maximum principal stress, from -122.9 to -432.2MPa for the minimum principal stress, and from 122.1 to 333.1MPa for the maximum shear stress. The highest values were recorded when there was a 50% mismatch in the diameter of the vessels at the site of the end-to-end anastomosis.
The effect of the vessel's size discrepancy on the blood flow and deformation was remarkable in the end-to-end anastomosis. End-to-side anastomosis was superior to end-to-end anastomosis. FEM is a powerful tool to study vascular deformation, as it predicts deformation and biomechanical processes at sites where physical measurements are likely to remain impossible in living humans.
建立有限元模型（FEM）以研究吻合血管几何不匹配导致的微血管吻合术中应力和应变的影响。
构建端端吻合和端侧吻合的有限元模型。使用有限元软件（NISA）进行模拟。我们研究了端侧吻合中的插入角度以及宿主血管和受体血管之间血管开口大小的差异。有限元模型用于预测每个节点位置的主应力、剪应力和应变。
在不同模拟过程中预测出两种类型的血管变形：纵向变形和旋转变形。最大主应力的应力值范围为151.1至282.4MPa，最小主应力的应力值范围为 -122.9至 -432.2MPa，最大剪应力的应力值范围为122.1至333.1MPa。当端端吻合部位血管直径存在50%的不匹配时，记录到最高值。
在端端吻合中，血管大小差异对血流和变形的影响显著。端侧吻合优于端端吻合。有限元模型是研究血管变形的有力工具，因为它能预测在活体人类中可能无法进行物理测量的部位的变形和生物力学过程。
