Pipetting needle inner/outer wall cleaning mechanism and pipetting needle assembly

An inner/outer wall cleaning mechanism for a pipetting needle, the inner/outer wall cleaning mechanism for cleaning a pipetting needle, comprising:

• an inner wall cleaning pipe;
• wherein the inner wall cleaning pipe is connected at one end to an upper part of the pipetting needle and at the other end to an injection device;
• an outer wall cleaning pipe;
• wherein the outer wall cleaning pipe is connected at one end to a liquid guide and at the other end to the injection device;
• and
• the liquid guide;
• wherein liquid inlets are arranged on both sides of the liquid guide, a liquid outlet and an outer wall cleaning passageway hole are arranged in the liquid guide, one end of the liquid inlet is connected to the outer wall cleaning pipe at one end, the other end of the liquid inlet is connected to the end of the liquid outlet, and the other end of the liquid outlet is connected to the outer wall cleaning passageway hole.