不同散焦条件下脉冲CO2激光消融牛小腿骨的弹坑形态及热损伤

Xian-zeng Zhang, Z. Zhan, S. Xie, Qing Ye
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摘要

目的评价离焦辐照条件对脉冲CO2激光消融牛小腿骨影响的旁侧热损伤区和弹坑形态。将牛胫骨分为两组,每组分别置于位于焦前和焦后平面、光斑尺寸约为510 μm的pc控制电动直线驱动台上,并在聚焦光束中反复移动。脉冲CO2激光器波长为10.64 μm,脉冲重复频率为60 Hz。工作台移动速度为20 mm/s,扫描次数为6次。在标准组织学处理后,用光镜检查脉冲CO2激光烧蚀产生的热损伤区和火山口形态。结果表明,离焦辐照条件对烧蚀坑廓形、坑形态和附带热损伤区有重要影响。通过选择适当的辐射照射,将光束点聚焦在骨表面略下而非上方,可以获得更窄更深的切口,同时最小的附带热损伤。Keywords-laser消融;骨;CO2激光;散焦照射
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Crater Morphology and Thermal Injury of Bovine Shank Bone Ablated by Pulse CO2 Laser with Different Defocusing Conditions
To evaluate the zone of collateral thermal damage and crater morphology for evidence of defocus irradiation condition’s effect on the ablation of bovine shank bone with pulse CO2 laser. Bovine shank bone was divided into two groups, each group was put on a PC-controlled motorized linear drive stage which was located on the preand post-focus plane with a beam spot size of about 510 μm respectively and moved repeatedly through the focused beam. The wavelength of pulse CO2 laser was 10.64 μm, pulse repetition rate was 60 Hz. The moving speed of the stage was 20 mm/s, scan times was 6. the zone of thermal damage and crater morphology produced by pulse CO2 laser ablation were examined by light microscopy following standard histological processing. The results demonstrate that defocus irradiation condition has an important effect on ablation crater profile, crater morphology and the zone of collateral thermal damage. By selecting proper radiant exposure and focusing the beam spot not above but slightly beneath the bone surface, narrower but deeper cut with minimum collateral thermal injury can be obtained. Keywords-laser ablation; bone; CO2 laser; defocus irradiation
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