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设计并研制了一套可在视频监控和红光指示下实施半导体激光鼓膜造孔术的光学系统。首先,利用光束整形和波长合束技术将半导体激光单管出射的650nm激光和半导体激光列阵出射的810nm激光耦合到芯径为200μm,数值孔径为0.22的光纤中;然后,利用消色差透镜准直光纤出射的双波长激光,再利用另一个消色差透镜将光束聚焦到耳鼓膜上,该聚焦镜可通过机械部件沿光轴方向移动,从而调节鼓膜上光斑的大小;成像部分则直接使用商用视频耳镜;热反射镜用于使激光和成像光同轴。手术时,根据显示器上的红色指示光斑确定造孔位置。测量结果显示:该系统出光孔处的激光功率在0～13.3W间连续可调,造孔直径在1～3mm内连续可调。使用本系统可缩短手术时间,减少并发症;儿童患者手术时无需全身麻醉。另外,该系统还具有整机体积小、重量轻、电光转换效率高等优点。
Design and development of a set of optical systems for semiconductor laser tympanostomy under video surveillance and red light guidance. First, a 650nm laser beam emitted from a semiconductor laser tube and an 810nm laser beam emitted from a semiconductor laser array are coupled into an optical fiber with a core diameter of 200μm and a numerical aperture of 0.22 by using a beam shaping and a wavelength combining technique. Then, an achromatic The straight fiber emits a two-wavelength laser, and then uses another achromatic lens to focus the beam onto the eardrum. The focusing lens can be moved in the optical axis direction by a mechanical component to adjust the size of the spot on the eardrum. The imaging part is directly used in commercial Video otoscope; thermal mirror is used to make the laser and imaging light coaxial. During surgery, the location of the hole is determined by the red indicator spot on the display. The measurement results show that the laser power at the exit hole of the system can be adjusted continuously between 0 ~ 13.3W and the pore diameter can be continuously adjusted within 1 ~ 3mm. Use of the system can shorten the operation time and reduce complications; child patients without surgery under general anesthesia. In addition, the system also has the advantages of small size, light weight, high electrical conversion efficiency.