Takeshi Ohdaira

Learn More
In endoscopic surgery, limited views and lack of tactile sensation restrict the surgeon’s abilities and cause stress to the surgeon. Therefore, an intra-operative navigation system is strongly recommended. We developed an augmented reality (AR) navigation system based on preoperative CT imaging. The purpose of this study is to evaluate the usefulness,(More)
Intraoperative tumor localization often is difficult during laparoscopic surgery for early-stage upper gastrointestinal tumors. This study enrolled 15 patients undergoing laparoscopic gastrectomy. A magnetic marking clip–detecting system was used to apply a marking clip to the tumor site during preoperative gastroscopy, and to detect a marking magnetic(More)
Recently, robotics systems are focused to assist in Single Port Endoscopic Surgery (SPS). However, the existing system required a manual operation of vision and viewpoint, hindering the surgical task. We proposed a surgical endoscopic robot for SPS with dynamic vision control, the endoscopic view being manipulated by a master controller. The prototype robot(More)
Background: In the laparoscopic surgical treatment of early stage colorectal carcinomas, intraoperative tumor site identification is often difficult. We developed a novel marking method using a magnetic marking clip and a modified magnetometer system. Methods: We applied magnetic marking clips at the tumor site during preoperative colonoscopy and identified(More)
In laparoscopic colectomy the identification of the site of a tumor is often difficult. The topical injection of india ink or blue dye by preoperative colonoscopy is the most prevalent method to mark the tumor site; however, such a procedure also includes the intrinsic danger of possibly injecting dye into the peritoneal cavity. In addition, the injected(More)
OBJECTIVES Previous reports have indicated that small breast cancers without lymph node metastasis present a favorable prognosis. However, 10-20% of patients with T1 N0 invasive ductal carcinoma experience recurrence and have a poor prognosis. The objective of this study was to examine whether certain metastasis-related factors are prognostic of cancer(More)
Intraoperative Tumor site recognition is extremely difficult during laparoscopic surgical treatment of early-stage gastrointestinal carcinoma. A novel marking method that uses both metallic clips and a marking clip detector system (MCDS, Olympus Optical Co., Tokyo, Japan) modified from a metal detector system, was designed by the authors. Metallic clips(More)
Lens fogging during laparoscopic surgery extensively deteriorates operative field visibility and may provoke serious complications. A simulation model study was conducted using a conventional laparoscope, a conventional laparoscope plus heating (100°C, 10 s), a conventional laparoscope plus surfactant, and a conventional laparoscope plus both a titanium(More)
BACKGROUND Metacognition is the knowledge about one's own methods of perceiving, remembering, thinking, and acting. This study determined the significance of metacognitive skills in laparoscopic surgery with the aim of applying the findings in a laparoscopic surgery training program. MATERIAL AND METHODS Eighteen medical students with no experience in(More)
BACKGROUND/PURPOSE We have invented multi-piercing surgery (MPS) which could potentially solve the triangular formation loss and device clashing which occur in single-port surgery (SPS), as well as restricted visual field, organ damage by needle-type instruments, and impaired removal of a resected organ from the body which occur in needlescopic surgery(More)