止血带

Twist the tourniquet tighter.

把血带。

It shows that successfulness in puncturing can be more easily achived by applying tourniquets in several times and releasing the tourniquets after each cannulation when a less venosity appears.

说明利用套管针在静脉充盈不佳血管穿刺时，行次血带和送管后松血带可以提高穿刺功率。