Because of no local anesthesia, tissue edema is lightened, operation field is clear.
由于未加用局部麻醉，局部组织水肿减轻，手术解剖关系更清晰。
Conclusion Endoscope is easy to manipulate with a clear operation field, and can, therefore, be used in myringoplasty for all kinds of tympanic membrane perforations using sandwich technique.
结论耳内镜使用方便、术野清晰，夹层法适合于各种类型的鼓膜穿孔。
The utility model has the advantages of simple structure, clear image, easy operation, complete function, low cost, and wide applications in the technical field of teaching, scientific research, etc.
该机结构简单，成象清晰，易于操作、功能齐全，造价低廉，可广泛用于教学、科研等领域。
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