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Noncontact laser fiber delivery system for endoscopic medical a

机译：用于内窥镜医疗设备的非接触式激光光纤传输系统

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Abstract: The objective of the study was to design and to investigate laser fiber delivery system for treatment of obstructed human internal tubular organs using endoscopic techniques. This system eliminates the main disadvantages of both applied contact and non-contact probes, namely surface contamination with concomitant hydrothermal probe deterioration and large beam divergence with poor energy density, respectively. Proposed silica or sapphire probes produce quasi-collimated beam with specific outside diameter and power distribution. To provide comparative analysis of laser delivery systems' optical properties with non-contact endoscopic probes 'steady beam distance' (SBD) and 'steady beam ratio' (SBR) coefficients are proposed. The calculation results are presented in the form of the plots of the SBR - coefficients and SBDs for a 2.0 mm specific outside beam diameter versus laser wavelength, delivery fiber core diameter and its numerical aperture for both probe material. Additionally, the cross power distributions along the SBD were studied. Results obtained could provide a useful tool to designers of non-contact fiber delivery systems intended for a variety of medical applications, including endoscopic surgery with cw or pulse laser tissue irradiation, skin de- epithelialization, laser-induced fluorescence and photodynamic therapy.!10
机译：摘要：该研究的目的是设计和研究使用内窥镜技术治疗阻塞性人体内部管状器官的激光光纤传输系统。该系统消除了所应用的接触式和非接触式探头的主要缺点，即分别伴随着水热探头劣化的表面污染和具有较差能量密度的大束发散。建议的二氧化硅或蓝宝石探针可产生准准直光束，并具有特定的外径和功率分布。为了提供与非接触式内窥镜探头对激光传输系统的光学性能的比较分析，提出了“稳定光束距离”（SBD）和“稳定光束比率”（SBR）系数。计算结果以SBR-2.0 mm特定外光束直径与激光波长，传输光纤纤芯直径及其两种探针材料的数值孔径的系数和SBD的关系图的形式给出。此外，还研究了沿SBD的交叉功率分布。获得的结果可以为旨在用于各种医疗应用的非接触式光纤传输系统的设计者提供有用的工具，包括采用连续波或脉冲激光组织照射的内窥镜手术，皮肤上皮上皮化，激光诱导的荧光和光动力疗法。10

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