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目的观察不同直径和不同打击力度的圆柱形木棒对垂直方向打击皮肤所形成的中空性皮下出血形态的相关性。方法采用生物力学击打装置,使用5种不同直径(2.0~4.0cm)木棒,从零递增击打力度(0~2300N),对活体乳猪背部皮肤进行打击,观察乳猪背部皮肤中空性皮下出血分布范围、色泽及形态特征,并采用SPSS 13.0统计软件对所得数据进行分析。结果中空性皮下出血出现的最小打击力度阈值(230N),随打击工具直径的增大而阈值增大(230~810N);同一直径的木棒在不同击打力度下所形成的中空性皮下出血总宽度及中空宽度均没有统计学差异(P>0.05)。中空性皮下出血的范围随木棒直径的增大而增大(R2=0.953,P<0.01);皮下出血总宽度及中空宽度与打击物直径,存在较好的正相关性(R2=0.797,P<0.01),符合一元线性回归方程模型。结论本研究可望用于推断垂直打击造成中空性皮下出血的木棒直径的大小,为钝器致伤工具的判断提供初步的理论依据。
Objective To observe the correlation of cylindrical sticks with different diameters and different striking forces on the hollow subcutaneous hemorrhages formed by the vertical impact on the skin. Methods Biomechanical impacting device was used to beat the back skin of live suckling pig from five to five different diameters (2.0 ~ 4.0cm) with increasing impact force from zero (0 ~ 2300N) Subcutaneous bleeding distribution, color and morphological characteristics, and the use of SPSS 13.0 statistical software to analyze the data. Results The threshold value of the minimum attack strength (230N) of hollow subcutaneous hemorrhage appeared with the increase of the diameter of the striking tool (230 ~ 810N). The hollow subcutaneous hemorrhage of the same diameter wooden stick under different striking force There was no statistical difference in total width and hollow width (P> 0.05). (R2 = 0.953, P <0.01). There was a positive correlation between the total width of subcutaneous hemorrhage, the width of hollow and the diameter of hit object (R2 = 0.797, P <0.01), in line with a linear regression equation model. Conclusion This study is expected to be used to infer the diameter of mandibular haemorrhage caused by vertical stroke and provide a preliminary theoretical basis for judging blunt instrument.