Comparison of Classical Ultrasound Screen and Combined Wearable Display in Interscalene Nerve Blocks

This study hypothesizes that the use of smart glasses (Head-mounted display Vufine, model VUF-110, Vufine Inc., China)) improves the hand-eye coordination and the first-attempt success rate of ultrasound guided interscalene nerve block. This is a single-center, randomized, controlled study comparing the real-time ultrasound image through smart glasses (intervention group) or the ultrasound machine's monitor (control group) during the interscalene block.