Techniques to resolve the difficult cannulation cases include tapered tip catheter, guide wire, papillotome, and precut endoscopic papillotomy (EPT).

对于较困难之病例，尖细型管子，导引线法，电刀及内视镜乳突先前切开术法。

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.

利用套管针在静脉充盈不佳血管穿刺时，行分次扎止血带和送管后松止血带可以提高穿刺成功率。