摘要
目的:在耳郭重建手术中,目前国内外整形外科医生主要采用切取患者自体肋软骨,将其雕刻成为耳郭支架。或者采用进口的高密度多孔聚乙烯材料按健耳的大小和形状切削修整组装形成外耳支架。自体软骨支架的构建的外耳形状完全取决于整形外科医生的技术,而进口的高密度聚乙烯材料外耳的形状固定,无个性化。针对耳郭重建手术中外耳支架的构建难于与患者健侧耳郭较好匹配的问题,且基于医学CT影像技术和快速成形技术的迅速发展的基础上,探索一种新型构建外耳支架的设计与制造方法。方法:对患者健侧外耳的CT图像进行反求,通过图像分割、区域生长、图像开操作等方法,将耳郭组织与周围组织分开,利用三维重构设计出个性化的外耳支架的三维模型。然后采用熔融挤压快速成形技术制造出外耳支架。结果:①通过对患者健侧外耳的CT图像进行反求获得了耳郭的三维数据模型。②利用熔融挤压快速成形技术可制造出外形逼真且与健侧耳郭相对称的外耳支架。结论:由CT片层数据进行三维重构得到外耳的数据模型,用快速成形技术可得外耳实体模型,为耳郭重建手术提供一种新的方法。
AIM： In auricular reconstruction surgeries, autogenous costal cartilage is the most reliable material used for the sculpture of an auricle framework by orthopaedists. Recently the imported porous polyethylene framework of high density has been used for external ear reconstruction by cutting and assembling in accordance with the shape of the normal ear. The shape of the autogenous costal cartilage requires sufficient training to sculpt the plastic surgeons. And the fixed framework is not individual. It is difficult to be symmetrical to the normal auricle in ear reconstruction. Based on the development of CT images technology and rapid prototyping technology, a new method of designing and fabricating auricle scaffold is presented. METHODS ： The corresponding threshold value and region growing for segmentation were selected to classify the tissues of the external ear from the surrounding tissues based on the CT images of the normal side by reverse technology. The 3D model of individualized auricle scaffold was designed. Then the rapid prototyping system produced an auricle scaffold of fused deposition modeling （FDM）. RESULTS ：①A 3D reconstruction model of the auricle is obtained from the CT scan data of the patient contralateral good ear by reverse technology. ②FDM technology produced a real ear framework to match the size of the opposite good ear. CONCLUSION： The rapid prototyping technique combined with CT image reconstruction can obtain the reality form of ear and provide an efficient way to produce an auricle scaffold in microtia reconstruction.
出处
《中国组织工程研究与临床康复》
CAS
CSCD
北大核心
2007年第1期124-126,I0002,共4页
Journal of Clinical Rehabilitative Tissue Engineering Research
