To validate the efficacy of miniaturized ultrasound needle transducer as the primary guide for thoracic regional anesthesia.
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Needling time
Timeframe: Needle insertion to needle withdrawal, up to 20 minutes
Nerve block procedure time
Timeframe: Time from ultrasound contact with skin to needle withdrawal, up to 20 minutes
Success rate of blockade
Timeframe: 20 minutes post administration of local anesthetics (by ultrasound or cold sensation) or intraoperative (at the time of video-thoracoscope exploration)
Visibility of needle tip and anatomic structure
Timeframe: During block procedure, up to 60 minutes.