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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer analysis in an uncoiled model of the cochlea during magnetic cochlear implant surgery
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Heat transfer analysis in an uncoiled model of the cochlea during magnetic cochlear implant surgery

机译：磁力耳蜗植入手术中耳蜗未加油模型的传热分析

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摘要

Magnetic cochlear implant surgery requires removal of a magnet via a heating process after implant insertion, which may cause thermal trauma within the ear. Intra-cochlear heat transfer analysis is required to ensure that the magnet removal phase is thermally safe. The objective of this work is to determine the safe range of input power density to detach the magnet without causing thermal trauma in the ear, and to analyze the effectiveness of natural convection with respect to conduction for removing the excess heat. A finite element model of an uncoiled cochlea, which is verified and validated, is applied to determine the range of maximum safe input power density to detach a 1-mm-long, 0.5-mm-diameter cylindrical magnet from the cochlear implant electrode array tip. It is shown that heat dissipation in the cochlea is primarily mediated by conduction through the electrode array. The electrode array simultaneously reduces natural convection due to the no-slip boundary condition on its surface and increases axial conduction in the cochlea. It is concluded that natural convection heat transfer in a cochlea during robotic cochlear implant surgery can be neglected. It is found that thermal trauma is avoided by applying a power density from 2.265 × 10~7 W/m~3 for 114 s to 6.6 × 10~7 W/m~3 for 9 s resulting in a maximum temperature increase of 6°C on the magnet boundary.
机译：磁力耳蜗植入手术需要通过植入物插入后通过加热过程去除磁体，这可能导致耳内的热创伤。触控式传热分析是必需的，以确保磁体去除阶段是热安全的。这项工作的目的是确定输入功率密度的安全范围，以拆下耳朵，而不会在耳中引起热创伤，并分析自然对流相对于除去过热的传导的有效性。被验证和验证的未加油耳蜗的有限元模型应用于确定从耳蜗植入电极阵列尖端拆下1mm长的0.5毫米圆柱形磁体的最大安全输入功率密度范围。结果表明，耳蜗中的散热主要通过通过电极阵列传导来介导。电极阵列由于其表面上的无滑动边界条件而同时降低自然对流，并增加了耳蜗中的轴向传导。结论是，可以忽略机器人耳蜗植入手术中的耳蜗中的自然对流热传递。结果发现，通过将电力密度从2.265×10〜7 w / m〜3施加114s至6.6×10〜7 w / m〜3，避免了热创伤，得到9 s的最高温度升高为6° C在磁铁边界上。

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