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1,558 results on '"Hashizume, M."'

213. Remote-controlled laparoscope manipulator system, Naviot™, for endoscopic surgery

Author

Yasunaga, T, primary, Hashizume, M, additional, Kobayashi, E, additional, Tanoue, K, additional, Akahoshi, T, additional, Konishi, K, additional, Yamaguchi, S, additional, Kinjo, N, additional, Tomikawa, M, additional, Muragaki, Y, additional, Shimada, M, additional, Maehara, Y, additional, Dohi, Y, additional, Sakuma, I, additional, and Miyamoto, S, additional

Published
2003
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223. Feasibility Analysis of Bipolar Electric Scalpel Forceps Manipulator with 2-DOFs Bending Mechanisms.

Author

Kim, Sun I., Suh, Tae Suk, Magjarevic, R., Nagel, J. H., Yamashita, Hiromasa, Matsumiya, K., Masamune, K., Kobayashi, E., Sakuma, I., Liao, H., Hashizume, M., and Dohi, T.

Abstract

This paper proposes multi-functionalization of the previously reported laparoscopic forceps manipulator with multi-slider linkage mechanism which enables 2-DOFs horizontal and vertical bending of ±90 degrees and 1-DOF grasping manipulation. Specifically we added a bipolar electric scalpel function on the forceps blades for more safe, speedy and efficient surgical operation with coagulation of tissues and occlusion of blood vessels from various directions in abdominal cavity. This functionalization can lead cutting down the number of surgical instruments and insert ports, and saving troubles of changing tools. For the scalpel function, we mounted a pair of electrodes measuring 1.0 × 5.0 × 0.1 mm × 2 lines aligned with a 0.5-mm space, to generate high current density between two forceps blades. In animal experiment using swine (39 kg, male), we evaluated the ability of occluding blood vessels on mesenteric surface tissues through various directional approach paths using 2-DOFs bending manipulation effectively. We coagulated blood vessels 2-3 times with setting of 20 W and 2-3 seconds energization. And in order to confirm whether the blood vessels were completely occluded or not, we attempted a cut of ablated parts with scissors and checked blood leak. In this experiment we tried to occlude 6 vessels. Four vessels were occluded successfully, while other two vessel occlusions were incomplete. A little leak was shown in these vessels, however, some repeated coagulation made complete seals. These incomplete coagulations resulted from ablated tissues on the electrodes surface for something of a shield to interrupt effective energization. For the solution of this trouble, it can be effective to improve the electrode and forceps blade shapes. In conclusion, we are sure of feasibility of the bipolar electrode scalpel function with multi-DOFs bending manipulator to ablate tissues and seal blood vessels for laparoscopic clinical applications. [ABSTRACT FROM AUTHOR]

Published
2007
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224. Integration of MRI and ultrasound in surgical navigation for robotic surgery.

Author

Kim, Sun I., Suh, Tae Suk, Magjarevic, R., Nagel, J. H., Hong, Jaesung, Konishi, K., Nakashima, H., Ieiri, S., Tanoue, K., Nakamuta, M., and Hashizume, M.

Abstract

A surgical navigation system designed for percutaneous abdominal therapies was proposed and evaluated in clinical applications. In addition to segmentation and 3-D display of tumors using MRI, its integration with US can help surgeons deal with instabilities such as respiratory motion and soft tissue shift that are inherent in abdominal surgery. We also included a process to correct the registration error between MRI and US resulting from patient posture change or marker shift. The correction matrix computed by measuring the needle position in the MR and US images is multiplied by the registration matrix. Phantom and animal experiments demonstrated that the proposed method could combine the advantages of both MRI and US. The average insertion accuracy was less than 3 mm, and the time required to determine the optimal insertion path was less than that required under either US or MRI guidance alone. The newly developed system was applied to two patients who underwent PEIT therapy, and its feasibility in clinical applications was verified. [ABSTRACT FROM AUTHOR]

Published
2007
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