The aim of this clinical trial is to investigate the advantages of single-operator laser-assisted ultrasound-guidance comparing with traditional ultrasound guidance in peripheral venous catheterization.The primary question addressed is whether single-operator laser-assisted ultrasound-guidance could improve the first-attempt success rate of peripheral venous catheterization compared with traditional ultrasound guidance.
aged 18-80 years
BMI 18-30 kg/m²
ASA classification 1-4
infection or hematoma at the puncture site
patients mentally unstable or unable to cooperate
patient refused to participate