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首页> 外文会议>Conference on optical interactions with tissue and cells >Performance of Er:YAG laser ablation of hard bone under different irrigation water cooling conditions
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Performance of Er:YAG laser ablation of hard bone under different irrigation water cooling conditions

机译：不同灌溉水冷却条件下Er：YAG激光烧蚀硬骨的性能

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The biological applicability of the Erbium-doped Yttrium Aluminum Garnet (Er: YAG) laser in surgical processes is so far limited to hard dental tissues. Using the Er:YAG laser for bone ablation is being studied since it has shown good performance for ablating dental hard tissues at the wavelength 2.94 μm, which coincides with the absorption peak of water, one of the main components of hard tissue, like teeth and bone. To obtain a decent performance of the laser in the cutting process, we aim at examining the influence of sequenced water jet irrigation on both, the ablation rate and the prevention of carbonization while performing laser ablation of bone with fixed laser parameters. An Er:YAG laser at 2.94μm wavelength, 940 mJ energy per pulse, 400 μs pulse width, and 10 Hz repetition rate is used for the ablation of a porcine femur bone under different pulsed water jet irrigation conditions. We used micro-computed tomography (micro-CT) scans to determine the geometry of the ablated areas. In addition, scanning electron microscopy (SEM) is used for qualitative observations for the presence of carbonization and micro-fractures on the ablated surfaces. We evaluate the performance of the laser ablation process for the different water jet conditions in terms of the ablation rate, quantified by the ablated volume per second and the ablation efficiency, calculated as the ablated volume per pulse energy. We provide an optimized system for laser ablation which delivers the appropriate amount of water to the bone and consequently, the bone is ablated in the most efficient way possible without carbonization.
机译：迄今为止，掺surgical钇铝石榴石（Er：YAG）激光在外科手术过程中的生物适用性仅限于坚硬的牙齿组织。正在研究使用Er：YAG激光进行骨消融，因为它显示出在2.94μm波长处消融牙齿硬组织的良好性能，该波长与水的吸收峰重合，水是硬组织的主要成分之一，例如牙齿和骨。为了在切割过程中获得良好的激光性能，我们旨在检查顺序喷水灌溉对固定参数的骨进行激光烧蚀时对烧蚀率和防止碳化的影响。使用Er：YAG激光，波长为2.94μm，每脉冲能量940mJ，脉冲宽度为400μs，重复频率为10Hz，在不同的脉冲水喷射灌溉条件下消融猪股骨。我们使用微计算机断层扫描（micro-CT）扫描来确定烧蚀区域的几何形状。此外，使用扫描电子显微镜（SEM）对烧蚀表面上碳化和微裂纹的存在进行定性观察。我们根据烧蚀率（通过每秒烧蚀量和烧蚀效率（以每脉冲能量的烧蚀量计算）进行量化）评估不同喷水条件下激光烧蚀工艺的性能。我们提供了一种用于激光消融的优化系统，该系统可以向骨骼输送适量的水，因此，可以在不发生碳化的情况下以最有效的方式消融骨骼。

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