【摘要】 目的研究国人脊柱椎体的解剖特点和记忆合金特性,利用几何数学原理分析探讨记忆合金可扩张椎体支架(EVS)的设计参数与曲变差,探讨EVS椎体内扩张的安全性。方法 10具完整干燥脊柱标本,测量椎体前(A)、中(H)、后(B)的高度和椎体终板截面内倾距离长L与R及中心线长M,以M为EVS长度设计参数;Excel软件统计分析;运用几何原理分析EVS的曲变关系。结果 T4~L5椎体终板水平截面L/R长度为22~31mm(测量范围为18~35mm),中心线M为20~29mm,(测量范围为17~32mm),M略小于L/R;椎体中高为15~23mm(测量范围为12~26mm);椎体中高与椎体上终板矢状轴前后缘的比值H/M为0.70~0.80;弧长f取23mm可以满足临床国人胸腰段椎体压缩骨折EVS的设计要求。EVS的曲变差在1.0~6.0mm之间:临床常见的胸腰段椎体EVS曲变差为2.0mm~3.0mm之间;特殊设计球形EVS曲变差为4.0mm~6.0mm。结论椎体侧位前后缘距离M可作为EVS的设计参数和应用规格的选择依据;EVS在椎体内可以安全的扩张。更多还原

【Abstract】 Objective To study the characteristics of Chinese vertebral bodies and nickel-titanium shape memory alloy(SMA), it is to analyze EVS flex variation and to explore the EVS expandable characteristics in vertebra. Methods Ten complete sets of Chinese dry spinal specimens, they are to measure the antero-hight and midst-hight and meta-hight of vertebral bodies and survey introversion length "L" and "R" and sagittal longitude "M" in cross-section of terminal plate of vertebral body. The longitude "M" is as design parameter of the stent length. These data are statistical analysis by Microsoft Excel. The EVS flex variation is analyzed in geometry principle. Result From T4 to L5, the length "L" or "R" is from 22 to 31 mm on terminal plate section of vertebral body(the measuring ranges are from 18 to 35mm); siggital longitude "M" is from 20 to 29mm(the measuring ranges are from 17 to 32mm). The "M" longitude is less than "L or R" length. The midst high of vertebral body is from 15 to 23mm(the measuring ranges are from 12 to 26mm). The ratios of middle height "H" and siggital longitude "M" is from 0.70 to 0.80. The 23 mm length of arc "f" is contented EVS design for most Chinese thoraciclumbar compressed fractures. The EVS flex variation range is about from 1.0mm to 4.0mm.The EVS flex variation in thoraciclumbar segments is about from 2.0 to 3.0mm. The special globular design of repositor stent flex variation is about from 4.0mm to 6.0mm. Conclusion The length from anterior edge to posterior edge in vertebral body in siggital views could be as stent length design parameter and as application standard selection reference. The stent flex variation of geometry analysis could provide scientific evidence for EVS design and safety in vertebral body.更多还原