Objective To study the feasibility of Cannulae-needle used in continued brachial plexus block.

目的研究用套管针进行连续臂丛神经阻滞的可行性。

Objective To study the feasibility of Cannulae -needle used in continued brachial plexus block.

目的研究用套管针进行连续臂丛神经阻滞的可行性。