肋骨骨折固定植入物的增材制造:点阵设计的作用

Lauren Judkins, Richa Gupta, Christine Gabriele, Charles Tomonto, M. Hast, G. Manogharan
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引用次数: 1

摘要

肋骨骨折和胸连枷损伤是危及生命的损伤,通常需要使用金属(例如钛)骨折重建钢板和螺钉进行手术治疗。目前的植入设计没有考虑到人类肋骨的可变刚度,并且比天然骨要硬得多,导致不良的临床结果。在这项初步研究中,设计了具有体心立方(BCC)晶格的网格测试板组,孔隙率为36-86%。通过改变晶格支撑厚度在0.225-0.425 mm之间,改变单元格长度在1、2和3 mm之间,孔隙率发生了变化。测试板是使用已建立的激光粉末床熔融增材制造工艺制造的。在1.3 mm/min的应变速率下进行抗弯强度(4点弯曲)测试,以表征抗弯刚度和强度的变化。将支架厚度从0.425 mm减少到0.225 mm,将单元细胞长度从1 mm增加到3 mm,可使种植体刚度降低15.7% (p = 0.068)。该初步实验结果为设计具有不同力学性能的梯度晶格的全尺寸肋骨骨折重建板提供指导,以更好地匹配完整肋骨的行为。
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On Additive Manufacturing of Rib Fracture Fixation Implants: The Role of Lattice Design
Rib fractures and chest flail injuries are life threatening injuries that often require surgical treatment using metal (e.g. titanium) fracture reconstruction plates and screws. Current implant designs do not account for the variable stiffness present in human ribs and are much stiffer than the native bone, causing undesirable clinical outcomes. In this preliminary study, groups of latticed test plates were designed with a body centered cubic (BCC) lattice and porosities ranging from 36–86%. Porosity was altered by changing lattice strut thickness between 0.225–0.425 mm and unit cell length between 1, 2, and 3 mm. The test plates were fabricated using an established laser powder bed fusion additive manufacturing process. Flexural strength (4-point bending) tests were performed at a strain rate of 1.3 mm/min to characterize changes in bending stiffness and strength. It was found that implant stiffness could be decreased by 15.7% (p = 0.068) by decreasing strut thickness from 0.425 to 0.225 mm and increasing unit cell length from 1 to 3 mm. The results of this preliminary experiment serve as guidelines for the design of full-sized rib fracture reconstruction plates that contain a gradient lattice with varied mechanical properties to better match the behavior of intact ribs.
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