目的 基于现有的气腹装置,在低气压的前提下,设计一款用于微创手术的新型悬吊系统,以暴露更多手术视野,便于手术顺利进行。方法 利用Solidworks软件完成悬吊系统的结构设计,并基于有限元仿真分析技术,研究医用不锈钢、钛合金Ti6Al4V、钛合金Ti6Al7Nb和纯钛4种不同夹子制作材料以及尼龙(Polyamide-6,PA6)、涤纶、聚丙烯(polypropylene,PP)3种不同中间平面结构制作材料对悬吊系统使用性能的影响。结果 4种不同材料的夹子在夹持组织过程中,组织的形变量均较低,不会出现所夹持组织从夹子中滑脱的现象。就应力值而言,选用医用不锈钢材料时,夹子及其夹持组织的应力值均最低；对于中间平面结构的制作材料而言,当选取涤纶材料时,在悬吊系统工作过程中,中间平面结构会在外载荷作用下发生破坏；当选用PP材料时,中间平面结构会发生永久变形,且形变量最高,不利于临床手术的进行。结论 选择医用不锈钢作为夹子的制作材料为最佳。不宜选择涤纶作为中间平面结构的制作材料,选择PA6作为中间平面结构的制作材料为最优。
Objective: Based on the existing pneumoperitoneum device, a new suspension system for minimally invasive surgery was designed under the condition of low pressure to expose more surgical vision and facilitate the smooth operation. Methods The structure design of suspension system was completed with Solidworks software. Based on the finite element simulation analysis technology, the effects of four different clamp materials, i.e. medical stainless steel, Ti6Al4V, Ti6Al7Nb and pure titanium, and three different mid-plane structure materials, i.e. nylon (PA6), polyester and polypropylene (PP), on the performance of suspension system were studied. Results In the process of clamping tissue by clamps with four different materials, the tissue deformation is lower. The gripped tissue do not slip out of the clamp. The stress value of the clamp and its holding tissue are the lowest when the medical stainless steel material is selected. For the material of the mid-plane structure, when polyester is selected, the mid-plane structure will be destroyed under the external loading in the working process of the suspension system. When PP material is selected, the mid-plane structure will have the highest deformation, which is not conducive to the clinical operation. Conclusion The best material for clamp is medical stainless steel. It is not suitable to choose polyester as the material of the mid-plane structure, and PA6 as the material of the mid-plane structure is the best.