自然骨曲面对激光诱导空泡演化行为规律的影响  

Influence of Natural Curved Bone Surface on Evolution Behavior of Laser⁃Induced Cavitation Bubble

作　　者：李学坤 季凌飞[1,2] 张犁天 张洪龙 Li Xuekun;Ji Lingfei;Zhang Litian;Zhang Honglong(Institute of Laser Engineering,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;Key Laboratory of Trans-Scale Laser Manufacturing Technology,Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料与制造学部激光工程研究院,北京100124 [2]北京工业大学跨尺度激光成型制造技术教育部重点实验室,北京100124

出　　处：《中国激光》2023年第9期110-117,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(51975017,52205437)、北京市教委重点科研项目(KZ202110005012)、北京市自然科学基金(3214041)。

摘　　要：液体辅助红外激光消融硬生物组织的准确性和兼容性均优于机械工具,而在骨科手术中往往会遇到骨组织自然曲面位置的钻切需求。系统研究了波长约为2μm的中红外激光诱导空泡在自然骨曲面边界附近的演化行为规律,总结了不同无量纲距离(γ)空泡的非球形演变规律和空泡脉动周期的时间长度的变化趋势,并对空泡收缩过程进行了数值模拟分析。发现了空泡演化行为受骨曲面边界影响的机制,自然骨曲面边界的不对称性使空泡收缩时两侧泡壁处的压力梯度和移动速度不同,导致空泡在收缩时质心与两侧泡壁向自然骨曲面边界较高的一侧发生偏移,并引起空泡微射流向相同方向偏移。给出了用于补偿微射流作用点定位误差的光纤预置偏移量,得到了自然骨曲面附近0.2≤γ≤0.6的空泡产生的微射流速度。Objective The liquid-assisted infrared laser ablation of hard biological tissue in clinical surgery is superior to the use of mechanical tools in terms of accuracy and compatibility.Owing to the pressure gradient inside and outside the bubble,the laser-induced bubbles expand,contract,and eventually collapse in the liquid environment.As the bubble collapses,the released energy causes the surface of the biological hard tissue to ablate.Moreover,the dynamic behavior of laser-induced bubbles is affected by boundary constraints.During pulsation,the nearby boundary can significantly affect the shape of the bubble and make it deviate from the original spherical shape,which results in the generation of a high-speed microjet when the bubble collapses.Therefore,the existence and shape of the boundary directly affect the ablation of the bubble microjet on the material.Bone tissue has a natural curvature and often imposes requirements associated with the drilling and cutting of curved surfaces during orthopedic surgery.Moreover,studying effects of curved surfaces of natural bones on the evolution behavior of nearby bubbles and generated microjets can improve the accuracy and rate of bone ablation and contributes to the practical application of laser ablation in orthopedic surgery.Therefore,this paper presents research on the effect of the curved boundary of natural bones on the bubble evolution behavior and generation of microjets and relative mechanisms,which is significant for guiding the improvement of laser water-assisted bone ablation.Methods The experimental system used in this study is shown in Fig.1.Laser pulses with a wavelength of approximately 2μm are transmitted from a fiber to a bone target immersed in distilled water to induce a bubble,and a high-speed camera is used to capture the transient features of the bubble.Fresh pork bones are used as the target material;the curved boundary of the joint(curvature radius r≈10 mm)is used as the target position,and distilled water is used as the liquid environment.Moreo

关 键 词：激光技术 空泡演化 微射流 骨组织消融 

分 类 号：TN249[电子电信—物理电子学]