In a thoracentesis, a hollow needle to drain the fluid is carefully inserted over the top of a rib, to avoid injuring the neurovascular bundle running along the underside of each rib.

胸穿就是将一个空心针小心地沿肋骨上缘插入，这样是为了避免损伤沿每个肋骨下缘走行的神经血管丛。