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플레이트의 소성변형 과정이 재건술에서 플레이트 안정성에 미치는 영향
박시명(Si Myung Park),이득희(Deukhee Lee),노건우(Gunwoo Noh) (사)한국CDE학회 2016 한국CDE학회 논문집 Vol.21 No.3
Conventional bent plate used in mandibular reconstruction surgery needs safety verification since its mechanical properties are changed due to the plastic deformation during the bending process. In this study we investigate stability of the plastically deformed plate and the plate with the same shape without plastic deformation through the finite element analysis(FEA). First we simulate the process of plate bending to fit the defect in patient. Then, the other plate is modelled to represent a customized plate with the same shape of the plastically deformed one, but without any residual stresses from plastic deformation. After binding these plates to the mandible, we conduct the masticatory simulation. Finally, we compare the resulting Von Mises stress of the customized plate and of the bent plate. The bent plate shows much higher stress than the customized one due to the residual stresses form the bending process. The study shows that plastic deformation in the plate may decrease the safety of the reconstruction surgery.
뇌 내출혈종 수술을 위한 가중 ICP 알고리즘 기반 마커리스 환자-영상 정합 방법
서준호(Joonho Seo),이득희(Deukhee Lee),김영준(Youngjun Kim),박세형(Sehyung Park) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
In the conventional Intracerebral Hematoma (ICH) removal surgery, it has been required to install the stereotactic frame on the patient’s cranial surface to access to the intracerebral hematoma. Since it is invasive and also takes long time, we attempt to develop a robotic ICH removal procedure with a markerless registration applying optical 3-D scanner. Preoperative patient’s data should be investigated from the CT images; it includes patient’s 3-D facial surface, hematoma, and surgical plans. Intraoperatively scanned facial surface will be registered to navigate the hematoma in the current pose of patient. Here, the conventional ICP (Iterative Closest Point) algorithm can be used for the registration. However, we need to assume that the patient’s face should not be changed from the preoperative model since the ICP considers only rigid-body transformation. In this paper, therefore, we investigated some facial features, which can be used as anatomical landmarks to identify the position of hematoma in the cranial structure. Moreover, the facial features in the preoperative 3-D model are weighted for more accurate registration with intraoperatively scanned points, ignoring locally deformed facial shapes. Accordingly, more accurate and robust target identification can be achieved even with patient’s local facial shape changes from the preoperative data.
김영준(Youngjun Kim),Frederik Roy,이승빈(Seungbin Lee),서준호(Joonho Seo),이득희(Deukhee Lee),박세형(Sehyung Park) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
Laparoscopic surgery is a surgical procedure which uses long laparoscopic instruments through tiny holes in abdomen while watching images from a laparoscopic camera through umbilicus. Laparoscopic surgeries have many advantages rather than open surgeries, however it is hard to learn the surgical skills for laparoscopic surgery. Recently, some virtual simulation systems for laparoscopic surgery are developed to train novice surgeons or resident surgeons. In this study, we introduce the techniques that we developed for laparoscopic surgical training simulator for cholecystectomy (gallbladder removal), which is one of the most frequently performed by laparoscopic surgery. The techniques for cholecystectomy simulation include modeling of human organs (liver, gallbladder, bile ducts, etc.), real-time deformable body calculation, realistic 3D visualization of surgical scene, high-fidelity haptic rendering and haptic device technology, and so on. We propose each simulation technique for the laparoscopic cholecystectomy procedures such as indentifying cystic duct and cystic artery to clamp and cut, dissecting connective tissues between the gallbladder and liver. In this paper, we describe the techniques and discuss about the results of the proposed cholecystectomy simulation for laparoscopic surgical training.
김영준(Youngjun Kim),Frederick Roy,이승빈(Seungbin Lee),서준호(Joonho Seo),이득희(Deukhee Lee),박세형(Sehyung Park) (사)한국CDE학회 2012 한국CDE학회 논문집 Vol.17 No.5
Laparoscopic surgery is a surgical procedure which uses long laparoscopic instruments through tiny holes in abdomen while watching images from a laparoscopic camera through umbilicus. Laparoscopic surgeries have many advantages rather than open surgeries, however it is hard to learn the surgical skills for laparoscopic surgery. Recently, some virtual simulation systems for laparoscopic surgery are developed to train novice surgeons or resident surgeons. In this study, we introduce the techniques that we developed for laparoscopic surgical training simulator for cholecystectomy (gallbladder removal), which is one of the most frequently performed by laparoscopic surgery. The techniques for cholecystectomy simulation include modeling of human organs (liver, gallbladder, bile ducts, etc.), real-time deformable body calculation, realistic 3D visualization of surgical scene, high-fidelity haptic rendering and haptic device technology, and so on. We propose each simulation technique for the laparoscopic cholecystectomy procedures such as indentifying cystic duct and cystic artery to clamp and cut, dissecting connective tissues between the gallbladder and liver. In this paper, we describe the techniques and discuss about the results of the proposed cholecystectomy simulation for laparoscopic surgical training.