静脉穿刺

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佳血管穿刺时，行分次扎止血带和送管后松止血带可以提穿刺成功率。