A mechanical component with two rings pivoted on axes at right angles to each other allowing movement in two directions used in the flap extension and retraction system.
襟翼的伸出和收上系统内的具有两个圆环的机械部件。两个圆环的旋转轴相互垂直，以使部件在两个方向都能转动。
Objective: to develop a method for extension of the Posterior interosseous reverse flow flap and to im - prove its reliability.
目的：提出一种延长骨间背侧逆行皮瓣和增加其可靠性的方法。
The choice of pedicled or free flap depended on the size and the extension of defect, history of surgery in neck or preoperative radiotherapy, and general status of the patient.
结论对口腔口咽部肿瘤切除后的较大缺损，应视缺损的范围、大小及患者的一般情况、术前放疗、颈部手术史等综合考虑，选择最合适的组织瓣进行修复。
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