An improvement is that the anesthesia needle guiding passage (3) is arranged in a guiding groove (4) on the outer wall of the tube wall.

一种改进是所述麻醉针引导通道(3)是设置于管壁的外壁上的引导槽(4)。

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A needle valve with a threaded spindle is unscrewed to open a passage for the liquid to escape to the reservoir from the cylinder when the jack is required to be lowered.

当千斤顶需要下降时，一个带锭子的针型阀门被放松来使液体通过圆筒流回储备液箱。

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