The capsule endoscope swallowed from the mouth into the digestive system can capture the images of important gastrointestinal tract regions. It can compensate for the blind spot of traditional endoscopic techniques. It enables inspection of the digestive system without discomfort or need for sedation. However, currently available clinical capsule endoscope has some limitations such as the diagnostic information being not able to correspond to the orientation in the body, since the doctor is unable to control the capsule motion and orientation. To solve the problem, it is significant to track the position and orientation of the capsule in the human body. This study presents an AC excitation wireless tracking method in the capsule endoscope, and the sensor embedded in the capsule can measure the magnetic field generated by excitation coil. And then the position and orientation of the capsule can be obtained by solving a magnetic field inverse problem. Since the magnetic field decays with distance dramatically, the dynamic range of the received signal spans three orders of magnitude, we designed an adjustable alternating magnetic field generating device. The device can adjust the strength of the alternating magnetic field automatically through the feedback signal from the sensor. The prototype experiment showed that the adjustable magnetic field generating device was feasible. It could realize the automatic adjustment of the magnetic field strength successfully, and improve the tracking accuracy.
ObjectiveTo explore the feasibility and effectiveness of community-based rehabilitation for patients with cerebral infarction. MethodThe cerebral infarction patients (n=285) registered before March 2011 and newly involved in the research between March 2011 and September 2012 were randomly divided into rehabilitation group (n=142) and control group (n=143). The doctors in community hospitals were trained by specialist physicians in Neurology Department and Rehabilitation Department from second-grade hospitals. Community physicians were responsible for the patients' rehabilitation for one year. ResultsNo differences between the rehabilitation group and the control group in the time of enrollment situation (P>0.05). After six months of intervention, there were significant differences between the two groups of patients in neurological function, daily activity ability, anxiety and depression scale scores (P<0.05), and the difference was more significant after 12 months (P<0.01). The results of Kubota drinking experiment were significantly different between the two groups after six months of intervention (P<0.05). ConclusionsCommunity-based rehabilitation treatment can significantly reduce the degree of physical and mental disability. The cooperation between second-grade hospitals and community hospitals is an effective way to realize three-stage neurological rehabilitation, which can better improve patients' quality of life and is helpful for them return to the society.