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116 results on '"Nakadate, Ryu"'

5. Augmented Reality Guidance with Electromagnetic Tracking for Transpyloric Tube Insertion

Author

Bano, Jordan, Akahoshi, Tomohiko, Nakadate, Ryu, Cho, Byunghyun, Hashizume, Makoto, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Zheng, Guoyan, editor, Liao, Hongen, editor, Jannin, Pierre, editor, Cattin, Philippe, editor, and Lee, Su-Lin, editor

Published
2016
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14. 3.5 mm compliant robotic surgical forceps with 4 DOF : design and performance evaluation.

Author

Bandara, D. S. V., Nakadate, Ryu, Marinho, Murilo M., Harada, Kanako, Mitsuishi, Mamoru, and Arata, Jumpei

Subjects
*SURGICAL robots, *FORCEPS, *MULTI-degree of freedom, *FINITE element method, *MINIMALLY invasive procedures, *COMPLIANT mechanisms, *ROBOTICS
Abstract

Minimally invasive surgery (MIS) is a viable alternative to general surgery with distinct advantages. Robotically assisted MIS, has been demonstrated to achieve higher accuracy and repeatability in comparison with those of manual procedures. Despite these advantages, owing to the nature of some surgical procedures in which dexterous tissue manipulations in deep narrow areas of the human body are necessary, there is a need for further miniaturized tools with smaller bending radii. To cater to this requirement, this study proposes a new compliant mechanism based surgical robotic forceps. It can generate four degrees of freedom at the tip of the forceps including two bending motions in two perpendicular axes, grasping and rotation. A better combination of the stress distribution through the elastic material, grasping force, and range of motion was determined based on a series of finite element analyses. In addition, the manufactured prototype underwent a series of laboratory experiments to evaluate its effectiveness. Details of the mechanism, finite element analysis, prototype implementation, and evaluations are presented in this paper. [ABSTRACT FROM AUTHOR]

Published
2023
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33. Colorectal endoscopic submucosal dissection using novel articulating devices: a comparative study in a live porcine model

Author

Okamoto, Yasuharu, primary, Nakadate, Ryu, additional, Nakamura, Shotaro, additional, Arata, Jumpei, additional, Oguri, Susumu, additional, Moriyama, Tomohiko, additional, Esaki, Motohiro, additional, Iwasa, Tsutomu, additional, Ohuchida, Kenoki, additional, Akahoshi, Tomohiko, additional, Ikeda, Tetsuo, additional, Kitazono, Takanari, additional, and Hashizume, Makoto, additional

Published
2018
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38. Objective assessment of robotic suturing skills with a new computerized system: A step forward in the training of robotic surgeons.

Author

Busch, Caleb, Nakadate, Ryu, Uemura, Munenori, Obata, Satoshi, Jimbo, Takahiro, and Hashizume, Makoto

Subjects
*SUTURING, *MINIMALLY invasive procedures, *TRAINING of surgeons, *AIR pressure, *SURGICAL robots, *SUTURES
Abstract

Introduction: The purpose of this study was to assess robot‐assisted suturing skills on a laparoscopic intestinal anastomosis model by using a novel computerized objective assessment system. Methods: This study compared the suturing skills of 13 surgically naïve participants on an artificial intestinal anastomosis model that mimics real tissue. Each examinee sutured using da Vinci robot assistance under 2‐D and 3‐D visualization and with conventional laparoscopy (CL). Pressure‐measuring and image‐processing devices were employed to quantitatively evaluate suturing skills. Five unique criteria were used to evaluate the skills of participants. Results: Suturing under 3‐D visualization (P < 0.01) and with CL (P < 0.05) were significantly faster than under 2‐D visualization. Sutures placed under 3‐D (P < 0.05) and 2‐D (P < 0.01) visualization had significantly better suture tension than those placed with CL, which did not meet acceptable values for suture tension. Sutures placed with CL had significantly better air pressure leakage than those placed under 2‐D visualization (P < 0.05), which did not meet acceptable values for air pressure leakage and wound opening area. One participants failed to achieve full‐thickness sutures with 2‐D, two participants with CL, and one participant with 3‐D. Conclusion: Using 3‐D vision is necessary for complex maneuvering during robot‐assisted minimally invasive surgery. Our quantitative assessment system is useful for evaluating the skill acquisition of surgeon‐trainees undergoing robotic surgery training. [ABSTRACT FROM AUTHOR]

Published
2019
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40. A new robotic-assisted flexible endoscope with single-hand control: endoscopic submucosal dissection in the ex vivo porcine stomach.

Author

Onogi, Shinya, Iwasa, Tsutomu, Hashizume, Makoto, Ogino, Haruei, Ihara, Eikichi, Ogawa, Yoshihiro, Oguri, Susumu, Akahoshi, Tomohiko, Ikeda, Tetsuo, Nakadate, Ryu, Okamoto, Yasuharu, Arata, Jumpei, and Ohuchida, Kenoki

Subjects
ENDOSCOPES, SURGICAL robots, LAPAROSCOPIC surgery, SURGICAL equipment, SURGICAL excision
Abstract

Background: Difficulties in endoscopic operations and therapeutic procedures seem to occur due to the complexity of operating the endoscope dial as well as difficulty in performing synchronized movements with both hands. We developed a prototype robotic-assisted flexible endoscope that can be controlled with a single hand in order to simplify the operation of the endoscope. The aim of this study was to confirm the operability of the robotic-assisted flexible endoscope (RAFE) by performing endoscopic submucosal dissection (ESD).Methods: Study 1: ESD was performed manually or with RAFE by an expert endoscopist in ex vivo porcine stomachs; six operations manually and six were performed with RAFE. The procedure time per unit circumferential length/area was calculated, and the results were statistically analyzed. Study 2: We evaluated how smoothly a non-endoscopist can move a RAFE compared to a manual endoscope by assessing the designated movement of the endoscope.Results: Study 1: En bloc resection was achieved by ESD using the RAFE. The procedure time was gradually shortened with increasing experience, and the procedure time of ESD performed with the RAFE was not significantly different from that of ESD performed with a manual endoscope. Study 2: The time for the designated movement of the endoscope was significantly shorter with a RAFE than that with a manual endoscope as for a non-endoscopist.Conclusions: The RAFE that we developed enabled an expert endoscopist to perform the ESD procedure without any problems and allowed a non-endoscopist to control the endoscope more easily and quickly than a manual endoscope. The RAFE is expected to undergo further development. [ABSTRACT FROM AUTHOR]

Published
2018
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43. Gastric endoscopic submucosal dissection using novel 2.6-mm articulating devices: an ex vivo comparative and in vivo feasibility study

Author

Nakadate, Ryu, additional, Nakamura, Shotaro, additional, Moriyama, Tomohiko, additional, Kenmotsu, Hajime, additional, Oguri, Susumu, additional, Arata, Jumpei, additional, Uemura, Munenori, additional, Ohuchida, Kenoki, additional, Akahoshi, Tomohiko, additional, Ikeda, Tetsuo, additional, and Hashizume, Makoto, additional

Published
2015
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46. Multi-Degrees of Freedom Robotic tool with Remote Center of Motion for Laparoscopic Ultrasound Scan : Mechanical Structure and its Evaluation

Author

Arata, Jumpei, primary, Fukami, Kazunari, additional, Oguri, Susumu, additional, Ikeda, Tetsuo, additional, Nakadate, Ryu, additional, Onogi, Shinya, additional, Akahoshi, Tomohiko, additional, Harada, Kanako, additional, Mitsuishi, Mamoru, additional, Sakaguchi, Masamichi, additional, and Hashizume, Makoto, additional

Published
2015
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