Pounder Derrick J, Bhatt Shivani, Cormack Lesley, Hunt Bill A C
Centre for Forensic and Legal Medicine, University of Dundee, Dundee, Scotland, United Kingdom.
Am J Forensic Med Pathol. 2011 Mar;32(1):93-5. doi: 10.1097/paf.0b013e3181edf2fe.
Stab wounds produced by serrated blades are generally indistinguishable from stab wounds produced by non-serrated blades, except when visible tool mark striations are left on severed cartilage. Using a pig-skin experimental model, we explored the possibility that similar striations may be left in skin. Stabs into pig skin were made using a straight spine coarsely serrated blade (121), a drop point finely serrated blade (20), a clip point irregular coarsely serrated blade (20), a drop point coarsely serrated blade (15), and as controls 2 non-serrated blades (40). Tool mark striations could be seen on the skin wall of the stab canal in all stabs made using serrated blades but in none with non-serrated blades.The striation pattern, reflecting the class characteristics of the serrated blade, was the same as that described in cartilage but less well defined. Fixation of the specimen with Carnoy's solution best preserved visible striations, and fixation with formaldehyde after staining with 5% Neutral Red was also satisfactory. Casting with vinyl polysiloxane dental impression material greatly facilitated photo-documentation. Applying the technique to homicidal stabbings may help identify stab wounds produced with serrated blades.
锯齿状刀片造成的刺伤通常与非锯齿状刀片造成的刺伤无法区分，除非在切断的软骨上留下明显的工具痕迹条纹。我们使用猪皮实验模型，探究了皮肤中可能留下类似条纹的可能性。使用直刃粗锯齿刀片（121型）、水滴头细锯齿刀片（20型）、夹点不规则粗锯齿刀片（20型）、水滴头粗锯齿刀片（15型）对猪皮进行刺伤，并以2把非锯齿状刀片（40型）作为对照。在所有使用锯齿状刀片造成的刺伤创口皮肤壁上都能看到工具痕迹条纹，但使用非锯齿状刀片造成的刺伤则没有。反映锯齿状刀片类别特征的条纹图案与在软骨中描述的相同，但清晰度较低。用卡诺氏液固定标本能最好地保存可见条纹，用5%中性红染色后再用甲醛固定也令人满意。用乙烯基聚硅氧烷牙科印模材料进行铸型极大地便于了拍照记录。将该技术应用于杀人刺伤案件中可能有助于识别由锯齿状刀片造成的刺伤创口。
