Kabiri Ali, Talaee Mohammad Reza
School of Railway Engineering, Iran University of Science and Technology, Tehran, Iran.
Proc Inst Mech Eng H. 2022 Jan;236(1):84-93. doi: 10.1177/09544119211041417. Epub 2021 Aug 21.
Bone grinding is used to remove the skull bone and access tumors through the nasal passage during cranial base neurosurgery. The generated heat of the spherical diamond tool propagates and could damage the nerves or coagulate the arteries blood. Little is known about the non-Fourier behavior of heat propagation during bone grinding. Therefore, this study develops an analytical model of the hyperbolic Pennes bioheat transfer equation (HPBTE) to calculate the three-dimensional temperature and necrosis in the grinding region. In vitro experimental investigations were carried out, and the contact zone temperature was measured using an infrared thermography system to validate the proposed thermal model. The results demonstrate that the HPBTE provides more reliable temperature evaluation and thermal damage than Fourier or parabolic heat transfer equation (PHTE). Due to the low thermal diffusivity of the bone, the lower grinding feed rate leads to higher temperature amplitude and a smaller radius of the affected zone in the surface and depth of the bone. Also, the intensity of bone necrosis decreases with the increase of the feed rate, and the shape of the damage zone becomes stretched. This analytical model can assess the potential risk of the surgery before clinical trials. Also, it could be used for comparing the different operating conditions to minimize bone necrosis and improve the control process in neurosurgeries.
在颅底神经外科手术中，磨骨用于去除颅骨并通过鼻腔通道进入肿瘤。球形金刚石工具产生的热量会传播，可能会损伤神经或使动脉血液凝固。关于磨骨过程中热传播的非傅里叶行为知之甚少。因此，本研究建立了一个双曲型彭尼斯生物热传递方程（HPBTE）的分析模型，以计算磨削区域的三维温度和坏死情况。进行了体外实验研究，并使用红外热成像系统测量接触区温度，以验证所提出的热模型。结果表明，与傅里叶或抛物型热传递方程（PHTE）相比，HPBTE能提供更可靠的温度评估和热损伤评估。由于骨的热扩散率较低，较低的磨削进给速度会导致骨表面和深度处的温度振幅更高，受影响区域的半径更小。此外，骨坏死的强度随着进给速度的增加而降低，损伤区域的形状变得拉长。这个分析模型可以在临床试验前评估手术的潜在风险。此外，它还可用于比较不同的手术条件，以尽量减少骨坏死并改善神经外科手术中的控制过程。
