Takeshi Ohdaira

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PURPOSE 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(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)
BACKGROUND/PURPOSE We tried to determine whether the customization of an X-TRACT Tissue Morcellator could avoid the laceration-induced distension of surgical incisions/openings when transintestinally removing resected liver tissue from the body, when the greatest dimension of the tissue exceeded the dimension of the opening. METHODS Pigs were used to(More)
A 42 year old man without familial adenomatous polyposis had recurrent desmoid tumours in the left subclavicular site. Histological examination showed a typical desmoid tumour. Molecular analysis was performed in genomic DNA from this tumour, using polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) and direct sequencing methods. No(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)
BACKGROUND/AIMS This study was performed to investigate the technical aspects and perioperative results of using a subcutaneous abdominal wall lift system for laparoscopy-assisted colectomy. METHODOLOGY We attempted a laparoscopy-assisted colectomy for 19 patients and completed 16 cases using mini-laparotomy and a subcutaneous abdominal wall lift system,(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)
BACKGROUND In natural orifice transluminal endoscopic surgery (NOTES), the endoscope has the disadvantages of an unstable visual field and wide blind space. We developed a compact charge-coupled device (CCD) camera unit that can be transgastrointestinally placed in the abdominal cavity. METHODS The requisites for a wireless CCD camera unit for use in(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 Intraoperative tumor localization often is difficult during laparoscopic surgery for early-stage upper gastrointestinal tumors. METHOD 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(More)