The purpose of this symposium is to discuss the significance and the strategy to found the department of bio-medical engineering in Japan. The symposium is the 2nd one after the last 55th conference of JSMBE which was held at Toyama. The department of bio-medical engineering has been already established in most of the leading universities in Europe and the United States of America since 1950, while there are a few institutes of the bio-medical engineering in Japan. Until now, There is an agreement at the last meeting toward a positive direction on the foundation of the department of bio-medical engineering by discussing the current problems and learning the history and the strategy from the founders. It is the mandatory issue to be solved in order to grow the young generation up to the international level in the field of biomedical engineering and to strengthen the international competition in medical industry.
Intravascular surgery, such as coil embolization and stent placement, has been widely performed for treatment of cerebral aneurysms. Doctors must be skillful and sufficiently experienced to successfully manipulate and insert a guidewire and a catheter into the aneurysm via carotid and cerebral artery. Though blood vessel model is useful for training of the doctors in the field of the intravascular surgery, evaluation of doctor's skill and efficacy of training is insufficient. In this study, an ultrasound sensor was fabricated and equipped in the cerebral blood vessel model to measure the displacement of the vessel wall that is contacted and pushed by a guidewire or a catheter. It is confirmed that the fabricated ultrasound sensor could measure the displacement of blood vessel wall by the inserted catheter.
Recently, with the increased popularity of endovascular therapy, blood vessel model become more important owing to its practicality in skill training and new device evaluation. To develop the appropriate model, it's necessary to understand how doctors evaluate the model. In this research, a doctor in NeuroEndovascular therapy was interviewed to analyze his evaluation structure of blood vessel. During the test, the doctor was asked to evaluate three different blood vessel models made based on a same realistic geometry of cerebral artery by using catheter. A sensory test methodology called evaluation grid method was used to analyze the evaluation structure of the doctor. Our results suggest that, the evaluation of a blood vessel model by a doctor is made based on the sensation given by the model through the catheter, including the friction of the inner wall, the similarity of the shape, and the confidence obtained by using the model.
Intravascular treatment is recognized as one of the most difficult skills to acquire for medical doctors and realistic in vitro training systems for endovascular treatment are increasingly demanded these days. Vessel model is a major part to construct the system with strong requirements of the reproducibility of both mechanical properties and haptic sense during catheter operation. In this study, the condition to fabricate realistic models and the training system imitating the environment of intravascular treatment were established and 4-coil occlusion in the aneurysmal model was performed by a skilled medical doctor. The coils are successfully inserted into the aneurysm and the doctor evaluates haptic sense during the operation is similar to realistic situations. The experimental result and the doctor's evaluation indicate the new developed system is beneficial to the training of intravascular treatment.
Sleep quality is important for maintaining good health. However, many people are not satisfied with their quality of sleep. As a decline in sleep quality leads to a deterioration in attention and concentration during the day, the evaluation of sleep quality in daily life is necessary to improve sleep quality. In our previous works, smart-wear that could measure the electrocardiogram (ECG) in daily life was developed. The purpose of the present study is to measure the ECG during overnight sleep by using the smart-wear in order to evaluate sleep quality. The ECG of 15 healthy males was measured for 8 h during overnight sleep and stored on their smartphone. After the experiment, the measured ECG was evaluated by visual confirmation of R peaks at intervals of 60 s. The results show that the R peaks can be observed at 79.9 ± 10.5 % during overnight sleep.