2.2. Methods of Puncture and Catheterization
STERILE
All patients were punctured under ultrasonic guidance using an Edge™ ultrasound diagnostic system (Sonosite, U.S.A.) with a 5–10 MHz high-frequency ultrasound probe. The probe was coated with a coupling agent (Zihui Technology Group Co., Ltd.) and wrapped with a sterile plastic instrument set (Jiangxi 3L Medical Products Group [Cambodia] Co., Ltd.). The depth of the probe was 3–5 cm.All operations were performed by an attending physician with more than 5 years' experience of working in our department. All patients were placed in the supine position, with both arms on both sides of the chest wall and the face inclined to the left.