一、锌铜弓将任何来源的细锌条和铜丝焊接整形便成简易锌铜弓。二、胸腔插管用14号注射针,将尖端剪去锉钝,在钝端后3毫米处垂直于针管锉一小口与内经相通,转120°退一毫米再锉第二个小口,同法再锉第三个小口便告作成。用此插管很客易测出胸内负压,吸气呼气均为负压,且随呼吸而波动。 First, the zinc-copper bow Any source of fine zinc and copper wire welding will be simple and easy zinc-copper bow. Second, the thoracic intubation needle No. 14, the tip cut the file blunt, 3 mm at the blunt end perpendicular to the needle file a small mouth and internal medicine through the same, turn 120 ° retreat a millimeter and then file a second small mouth, the same method File again the third small mouth made. With this intubation is very easy to measure intrathoracic negative pressure, inspiratory breath are negative pressure, and fluctuations with the breathing.