Journal of Computer Aided Surgery Vol.6No.1

Open MRI 下脳外科手術におけるナビゲーションシステムの精度および操作性向上に関する研究
Accuracy Evaluation of Navigation System During Neurosurgery at Open MRI Theater and Improvement of its Maneuverability

長嶋義昭a*, 廣瀬佐智雄a, 鈴川浩一b, 苗村潔c, 高信英明d, 村垣善浩e, 伊関洋e, 梅津光生a, 高倉公朋e

a 早稲田大学大学院理工学研究科・生命理工学専攻
b インフォコム株式会社
c 東京工科大学バイオニクス部
d　工学院大学工学部機械システム工学科
e　東京女子医科大学大学院先端生命医科学研究所・先端工学外科学分野

Yoshiaki Nagashima a, Satio Hirose a, Kouichi Suzukawa b, Kiyoshi Naemura c, Hideaki Takanobu d, Yoshihiro Muragaki e, Hiroshi Iseki e, Mituo Umezu a, Kintomo Takakura e
a Department Integrative Bioscience and Biomedical Engineering , Waseda University
b Infocom Co.Ltd
c School of Bionics, Tokyo University of Technology
d Department of echanical Systems Engineering , Kogakuin University
e Faculty of Advanced Techno-Surgery, Institute of Advanced Biomedical Engineering & Science, Tokyo Women's Medical University

Abstract: The reflective ball marker has the combined function of conventional operation marker with function of reflective ball can be recognized by optical position measuring equipment. Then, automatic registration became possible to eliminate artificial operation. Consequently, preparation time was decreases, and accuracy became much improved.
Keywords: Reflective ball marker, Automatic registration, Preparation time , accuracy.

四次元骨格・骨格筋モデルを用いた人工股関節設置後患者の術後動作解析システム
Motion Analysis System after Total Hip Arthroplasty by using the Patient - Specific 4-dimensional Musculoskeletal Model

大竹義人（正会員）a*, 鈴木直樹a, 服部麻木a, 三木秀宣b, 山村在慶c, 中村宣雄c, 菅野伸彦b, 米延策雄d, 越智隆弘e
a 東京慈恵会医科大学高次元医用画像工学研究所
b 大阪大学大学院医学系研究科器官制御外科学
c 協和会病院
d 国立大阪南病院整形外科
e 大阪大学大学院医学系研究科医工学治療学
Yoshito Otake a*, Naoki Suzuki a, Asaki Hattori a, Hidenobu Miki b, Mitsuyoshi Yamamura c, Nobuo Nakamura c, Nobuhiko Sugano b, Kazuo Yonenobu d, Takahiro Ochi e

a Institute for High Dimensional Medical Imaging , Jikei University School of Medicine
b Department of Orthopaedics, Osaka University Graduate School of Medicine
c Kyowa-kai Hospital
d Department of Orthopaedic Surgery, Osaka Minami National Hospital
e Department of Computer Integrated Orthopaedics, Osaka University Graduate School of Medicine

Abstract: We constructed a 4-dimensional musculoskeletal model for patients having had total hip arthroplasty (THA), which aims to simulate the movement of the patient's inner body structure and estimates the complications after THA. This model reflects the patient-specific characteristics of the bone geometry, implant alignment and the characteristics of the movement. In order to estimeate the direction of the muscle force and the length of the muscles, we have developed a string-typed muscle model representing the route of the muscles. The strings expand and contract according to the movement of the origin and insertion location of the muscle. We developed models of the seven muscles related to the movement of the hip joint. By using this model, clinicians can predict the potential for dislocation or recognize the causes of dislocation , including the influence of the muscles.
Keywords: 4D muscle model , Total hip arthorplasty (THA), Dislocation.

形状記憶合金を用いた腸閉塞治療用能動カテーテル
Active Catheter Usiing Shape Memory Allpy for Treatment of Intestinal Obstruction

水島昌徳（正会員）a*, 芳賀洋一（正会員）b, 戸津健太郎b, 江刺正喜（正会員）c
a 独立行政法人科学技術振興機構
b 東北大学大学院工学研究科
c 東北大学未来科学技術共同研究センター
Masanori Mizushima a, Yoichi Haga b, Kentaro Totsu b, masayoshi Esashi c
a Japan Science and Technology Agency
b Graduate School of Engineering, Tohoku University
c New industry Creation Hatchery Center, Tohoku University

Abstract: Soft and long silicone rubber tubes (catheters) are commonly used for conservaive treatment in intestinal obstruction (ileus). It is difficult to pass the passage at the lower end of the stomach (pylorus). Doctors must be skillful and experienced enough to insert the tube into the intestine. Although there are some instruments which make the procedure easier, for example an endoscope , a guide wire, a long over tube and attaching weight at the tip of the tube, easier and more certain method has been required to pass the pylorus. Active bending tube using shape memory alloy coil micro actuator has been developed . Doctors can control bending motion of the tip of the ileus tube easily by applying electrical current to the SMA actuator from outside the body.
Keywords: SMA, ileus tube, active catheter, actuator, guide wire

術中臓器形状に基づく腹腔鏡下Data-Fusion システムの開発
Development of Laparoscopic Data-Fusion System Based on an Intraoperative Organ Shape

林部充弘（正会員）a*, 鈴木直樹a, 服部麻木a,小林進b, 中村仁彦c
a 東京慈恵会医科大学　高次元医用画像工学研究所
b 東京慈恵会医科大学　外科学講座
c 東京大学大学院　知能機械情報学専攻

Mitsuhiro Hayashibe a*, Naoki Suzuki a, Asaki Hattori a, Susumu Kobayashi b, Yoshihiko Nakamura c
a Institute for High Dimensional Medical Imaging , Jikei Univ. of School of Medicine
b Department of Surgery, Jikei Univ. of School of Medicine
c Department of Mechano-Informatics, University of Tokyo

Abstract: Laparoscopic surgery forces surgeons to operatie with mechanical and visual constraints. Surgeons are required to intuit a sense of orientation in the abdominal cavity solely from the memorized anatomical structure. Laparoscopic surgery would be technologically improved if surgeons were provided with the 3D shape of the internal geometry including with texture information in an intuitive manner. In this paper, intraoperative real-time 3D visualization and Data-Fusion using this organ geometry verifies the functionality in an in-vivo experiment.
Keywords: Data-fusion, Laparoscopic Shape Measurement , Intraoperative Registration, Video-based Rendering.