制作及使用方法:用一类似血压计式的33×10×6厘米去掉底盖的木合,在上盖距前端10.5厘米处加一个6.5×6×4厘米的半元形木槽,直径3.5厘米,深3厘米,固定大注射器。木合内腔加一较细弹簧连8号铁丝一根从合尾端穿出,另一端固定,木合上盖内面加一个17.5×2×1.5厘米两层铁板的小槽。在弹簧和8号铁丝连接处固定一高出顶盖平面4～5厘 Production and use: Use a similar sphygmomanometer type 33 × 10 × 6 cm to remove the bottom cover of the wood, in the top cover 10.5 cm from the front plus a 6.5 × 6 × 4 cm semi-shaped wooden groove diameter of 3.5 Cm, 3 cm deep, fixed large syringe. A small spring lumber with a small spring with a wire from the end of a piercing out the other end of the fixed, wood cover the inside plus a 17.5 × 2 × 1.5 cm two layers of iron small slot. In the spring and 8 wire connection at a fixed roof above the plane 4 to 5%