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Biophysics of Cochlear Implant/MRI Interactions Emphasizing Bone Biomechanical Properties.

机译:强调骨骼生物力学特性的人工耳蜗/ MRI相互作用的生物物理学。

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OBJECTIVE/HYPOTHESIS The forces exerted during a 1.5-Tesla MRI evaluation on the internal magnet of a cochlear implant (CI) raise concern about the safety for CI recipients. This study determines the magnitude of force required to fracture the floor of a CI receiver bed.METHOD Recessed CI beds were drilled to maximum uniform thinness into formalin-fixed and fresh-frozen human calvaria specimens. A Med-El stainless steel CI template mounted to the piston of an electrohydraulic testing device was used to fracture the floor of the implant beds. Force and displacement were measured as a function of time using a digital data acquisition system.RESULTS Mean force to first failure, displacement to first failure, and minimum thickness, respectively, were: group 1 (formalin-fixed, 0.3-0.4-mm thick [n = 22]), 34.08 N (8.21-59.64 N, standard deviation [SD] 15.41 N), 1.09 mm (0.40-2.16 mm, SD 0.51 mm), 0.36 mm (0.3-0.4 mm, SD 0.05 mm); group 2 (formalin-fixed, 0.5-0.9 mm thick [n = 21]), 52.82 N (20.28-135.53 N, SD 25.29 N), 1.08 mm (0.50-2.28 mm, SD 0.47 mm), 0.58 mm (0.5-0.9 mm, SD 0.12 mm); group 3 (fresh-frozen [n = 9]), 134.13 N (86.44-190.70 N, SD 34.92 N), 1.96 mm (1.47-2.46 mm, SD 0.35 mm), 0.42 mm (0.3-0.6 mm, SD 0.11 mm).CONCLUSIONS The mean magnitude of force required to fracture the floor of a CI bed is significantly greater than those that are generated when a Med-El Combi 40+, CII Bionic Ear CI, or Nucleus Contour CI is placed into a 1.5-Tesla MRI unit.
机译:目的/假设在1.5 Tesla MRI评估过程中,对人工耳蜗(CI)的内部磁体施加的力引起了对CI接受者安全性的担忧。这项研究确定了破坏CI接受器床的地板所需的力的大小。将MEHOD凹陷的CI床钻到福尔马林固定和新鲜冷冻的人类颅盖标本中,以最大程度地减小厚度。使用安装在电动液压测试设备活塞上的Med-El不锈钢CI模板破坏植入床的地板。结果使用数字数据采集系统测量了力和位移随时间的变化。结果第一次破坏的平均力,第一次破坏的位移和最小厚度分别为:第1组(福尔马林固定,厚度0.3-0.4-mm) [n = 22]),34.08 N(8.21-59.64 N,标准偏差[SD] 15.41 N),1.09 mm(0.40-2.16 mm,SD 0.51 mm),0.36 mm(0.3-0.4 mm,SD 0.05 mm);第2组(福尔马林固定,厚度0.5-0.9 mm [n = 21]),52.82 N(20.28-135.53 N,SD 25.29 N),1.08 mm(0.50-2.28 mm,SD 0.47 mm),0.58 mm(0.5- 0.9毫米,SD 0.12毫米);第3组(新鲜冷冻[n = 9]),134.13 N(86.44-190.70 N,SD 34.92 N),1.96毫米(1.47-2.46毫米,SD 0.35毫米),0.42毫米(0.3-0.6毫米,SD 0.11毫米) )结论破坏CI床底板所需的平均力明显大于将Med-El Combi 40 +,CII仿生耳CI或Nucleus Contour CI放入1.5特斯拉时产生的力MRI单元。

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