Construction of high reliability and ultra-thin medical laser endoscope

介质涂层金属中空光纤是目前医学领域常用的红外光纤之一。研制了一种用于内窥镜多波长医用激光治疗的柔性中空光纤.一种用于多波长激光传输的中空光纤的研制在环烯烃聚合物（COP）涂覆银（COP/Ag）中空玻璃光纤的制备中，通常采用液相涂覆法涂覆COP层。COP层的均匀性是获得高性能中空纤维的重要因素之一。在可见光或红外区的几个关键波段，医用激光传输已达到低损耗特性。我们提出了一种闭环流动的方法，以涂覆一个均匀的COP层。该方法已成功应用于中空纤维的制备.开发具有生物相容性和高可靠性的超柔性中空纤维我们开发了具有聚碳酸酯（PC）毛细管的中空纤维，用作支撑管。通过调整毛细管制备过程中的拉伸温度，得到了内表面光滑、均匀的毛细管。获得了Er：YAG激光器的低损耗传输特性.高性能微型输出器件的开发为了在较小的操作空间内改变激光的输出方向和焦距，我们开发了玻璃密封空心光纤。我们发现当密封端面的形状被适当地制造时，远端尖端起着聚焦光学的作用.激光导管的构建和评价Er：YAG激光和绿色引导光束通过内窥镜同时传输，即使在弯曲半径小至1 cm的情况下，损失也很小。通过使用中空光纤将Er：YAG激光传递到模型结石，并评价破碎效率。

A dielectric-coated metallic hollow fiber is one of the commonly used infrared fibers in medical field nowadays. We developed a flexible hollow fiber for multi-wavelength medical laser treatment in endoscope.1. Development of a hollow fiber for multi-wavelength laser light transmissionIn the fabrication of the cyclic olefin polymer (COP) coated silver (COP/Ag) hollow glass optical fiber, a liquid-phase coating method is normally used for the COP layer. The uniformity of the COP layer is one of the most important factors to obtain hollow fibers with high-performance. Low-loss properties have been attained in several key wavelength bands in the visible or infrared region for medical laser transmission. We proposed a closed loop-flowing method in order to coat a uniform COP layer. The method was successfully applied to the fabrication of hollow fiber.2. Development of a ultra-flexible hollow fiber with biocompatibility and high reliabilityWe developed hollow fibers with polycarbonate (PC) capillaries for use as a supporting tube. By adjusting the drawing temperature in the fabrication of the PC capillaries, we obtained uniform PC capillaries with a smooth inner surface. We attained low loss properties for Er: YAG laser light transmission.3. Development of micro output devices with a high performanceIn order to change the output direction and focal distance of laser light in a small operation space, we developed glass sealing hollow fibers. We showed that the distal tips functioning as focusing optics when the shapes of sealed end surfaces are properly fabricated.4. Construction and evaluation of a laser catheterEr : YAG laser light and green pilot beam were simultaneously delivered through the endoscope with small losses even when it was sharply bent with a bending radius as small as 1 centimeter. Er : YAG laser light was delivered to reach a model calculus by using a hollow fiber and fragmentation efficiency were evaluated.