Medical information including medical images are used for surgical navigation system, however, surgeon often encounter the difficulties to obtain a precise registration between pre-operative information and the patient. In this paper, we propose to apply “augmented reality system” with a simple display device. It's comprised of a 5.6inch LCD, a half mirror, and a frameless positioning maker system. Through the half mirror, surgeon can observe the real patient and reflected image of the LCD, on which the navigation image are shown simultaneously at the right position floating inside the patient body to perform minimally invasive surgery. System precision including human perception error are evaluated using phantom experiments and the total result are 1.96±1.28mm and the pilot trial in the operating room are performed toward clinical use.
Hip joint surgeries are commonplace in our aging society. In this paper a prototype of a muscle retracting manipulator for minimally invasive RAO (Rotational Acetabular Osteotomy and one of the hip joint su rgeries) is described. The muscle retracting manipulator's role is to make a surgical space between muscles and the surface of bone around hip joint for the other manipulator whose role is to cut bone. The mechanical structure is very thin to follow narrow path and tough enough to peel muscles around hip joint. Pealing force of periostea by using a raspatory (a conventional peeling tool of periostea) were measured as a preliminary experiment. The prototype of the manipulator was composed from the result. Evaluation of the prototype was done on a porcine iliac bone.
Computer graphics and rapid prototyping have been combined to convert computer tomography into three-dimensional data. This method has been turned to practical use in preoperative planning, inter operative support, and informed consent. Over 17 different types of medical procedures have been developed through this rapid- prototyping method, including procedures related to fracture deformation healing, osteoarthritis, and scaphoid nonunion. From an integrated design engineering perspective, we consider how surgical support through rapid modeling relates to the verification of sequences in medical behavior (information). Finally, we consider future developments.
During a surgical procedure, blood covering the surgical field hinders the surgeon's visual inspection. We propose a novel application of hyperspectral imagery in the biomedical field. We conceived a method to exploit the capabilities of hyperspectral imaging systems in order to provide clearer images of areas covered by blood to the surgeon. We developed a neural network approach to generate a nonlinear combination of spectral reflectance bands in the near infrared region revealing images that could not be seeing in unprocessed images. The experimental results are compared with conventional image processing techniques. We present in vitro experimentsusing human blood and in situ experiments using guinea pigs to attest the validity of the proposed method.