“直柱”用英语怎么说？

外面的启动按钮位于独立安装的直柱顶端.The outside call buttons are located on top of individually installed poles.以前我们用直柱状活塞型人工镫骨作人工镫骨安装术,发现这种人工镫骨因经不起鼓室压力的较大变化而产生一些并发症,影响远期效果.Abstract Straight columnar piston type stapes prosthesis is comm...