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Figure 1: A 20 mm YL-1 hematoma aspiration needle. Photograph of inner needle type drilling, outer three way pipe and no hole caps. The outer tube is 2 mm in diameter and 20 mm in length. An oval window opens on the ventral side wall at the tip of the outer tube

Figure 1: A 20 mm YL-1 hematoma aspiration needle. Photograph of inner needle type drilling, outer three way pipe and no hole caps. The outer tube is 2 mm in diameter and 20 mm in length. An oval window opens on the ventral side wall at the tip of the outer tube