During recent years,various navigation systems become available in brain surgery.However,these systems cannot display the information display into operative field.This 02(IX)-49 画
Chemotherapy and radiotherapy are performed for the treatment of cancer in children, especially leukemia. But, the side effects of these tr eatments are a problem of continuing concern, and improving the patient's quality of life (QOL) following successful treatment remains a challenge. Especially with radiation therapy, disorders of reproductive function are considerable, and cases of inferti lity are extremely high. Currently, research on the cryopreservation of ovarian tissue i s being energetically pursued, but because of factors such as reduction in number of egg cells and physical disruption due to tissue fragmentation, the successful fertiliz ation rate of the thawed ovum has been extremely low. Accordingly, cryopreservation of t he ovaries as an entire organ has been attempted, but this has yielded little success. This study focused on a method for cryopreservation through the application of sup ercooling under a variable magnetic field, and the development of a freezing syste m allowing for an arbitrary change in frequency of magnetic field applied to the specimen. To confirm the interrelation between a variable magnetic field and supercooling, physiological saline solution was frozen under a variable magnetic field, and the pro gress and stabilization of supercooling was verified for magnetic field frequencies from 200 to 200 kHz. Additionally, ovaries were frozen under magnetic field, and histological assessment of the tissue was performed.
A new locally operated unilateral master-slave manipulator for endoscopic surgery performed by a surgeon in a sterilized area was developed. The manipulator system consists of a portable master device and a forceps slave manipulator LODEM as the third arm. We propose the 3DOFs portable operating device with gimbals for the pitch and yaw axes, and a linear guide roller for the insertion axis though into the commercial forceps. The dimensions of the mechanical component are 90 mm × 180 mm × 120 mm, and its mass is 470 g. The operating ranges for these axes are ±60 °, ±60 °, and 200 mm, respectively. The mechanical backlash for these axes are 1.7 °, 1.4 °, and 5.2 mm, respectively. The mobile LODEM is unilateral master-slave point to point controlled by the master device. The master-slave manipulator was confirmed for these axes.
MRI image guided intervention is now gradually spreading with the precise/plenty surgical information acquired from intra-operative MR images, however, surgeon encounters difficulties to obtain accurate "registration" between navigation results and operating devices, and it is almost impossible to perform operation inside the MRI scanner because of its narrow gantry space. To solve this problem, the introduction of novel technologies should be required for precise/safe surgical operations under MRI. In this key-note speech, we focus on our recent research works including MR image guided surgical robotics and the augmented reality system. Both are MR safe or MR conditional systems for use under the strong magnetic field.
In a small room such as an operating room where there are multiple staff, some orders should be transmitted to a selected person. For achieving this without any wearable devices, we developed a voice transmission system using a parametric speaker. To use a parametric speaker in a small room, we had some experiments to investigate sound pressure characteristics in a small room and understandability of the transmitted voice with MOS. As a result, it was confirmed that the transmitted voice, which has possibility that reflect on the wall and reach to a not selected person, could be heard clearly.
