目前在国内外,硬管乙状结肠镜仍是诊断和治疗直肠,乙状结肠疾病的常用器械。这种诊断方法,也是最重要,最简单的,它可以在直视下观察大肠病变的位置、大小、形态,且能尽快地为诊断提供依据。而且,全部结肠癌的75％是在乙状结肠镜所能到达的范围内。又由于其方便实用,技术难度不大,造价低廉,便于推广。对于城乡,尤其 At home and abroad, hard tube sigmoidoscopy is still a common device for diagnosing and treating rectal and sigmoid colon diseases. This diagnostic method is also the most important and the simplest. It can observe the location, size and shape of the large intestine lesions under direct vision and can provide a basis for diagnosis as soon as possible. Moreover, 75% of all colon cancers are within reach of sigmoidoscopy. Because of its convenience and practicality, the technology is not difficult, the construction cost is low, and it is easy to promote. For urban and rural areas, especially