Shrestha B L
Department of ENT-HNS, Dhulikhel Hospital, Kathmandu University Hospital, Dhulikhel , Kavre , Nepal.
Kathmandu Univ Med J (KUMJ). 2013 Apr-Jun;11(42):185-7. doi: 10.3126/kumj.v11i2.12500.
Though the microscope has helped a lot in otological surgical procedure but it has same optical properties for the last three decades.1 Thus, it has its own limitation as it provides a magnified image along a straight line (Fig 1).2 Meanwhile, the introduction of endoscope in other area of medical field also finds its role in ear surgery. Since, the endoscopes have better optics and magnification with wide angle of view (Fig 2) due to angled lenses and provide the excellent resolution of image. This advantageous factor increases its role in surgeries having many difficult anatomic nooks and corners.3 The diagnostic and teaching role of endoscope in otological practice has already been proved. Apart from that, there are lots of other advantages of endoscope in otological surgeries like; antero-inferior recess of external auditory canal, middle ear cavity and difficult areas to visualize under microspore like sinus tympani can be well visualized.4,5.
尽管显微镜在耳科手术中帮助很大，但在过去三十年里其光学特性一直相同。因此，它有自身的局限性，因为它沿直线提供放大图像（图1）。同时，内窥镜在医学领域其他方面的引入也在耳科手术中发挥了作用。由于采用了角形透镜，内窥镜具有更好的光学性能和放大倍数，视角宽广（图2），并能提供出色的图像分辨率。这一有利因素增加了它在具有许多解剖学上难以触及的角落的手术中的作用。内窥镜在耳科实践中的诊断和教学作用已经得到证实。除此之外，内窥镜在耳科手术中还有许多其他优点，如外耳道前下隐窝、中耳腔以及在显微镜下难以观察到的区域，如鼓室窦等，都能清晰地观察到。
