Electrical impedance tomography (EIT) is a technique that uses an array of electrodes to deliver safe stimulating currents and measures the boundary voltages between adjacent electrode pairs in the array in sequence. Subsequently, it reconstructs the impedance distribution in all or part of the tissue using reconstruction algorithms to achieve structural and functional imaging. Lung EIT technology features continuity, being radiation-free and non-invasive, and it can be used for real-time dynamic monitoring of the lungs in critically ill patients. This paper introduces the basic principles of lung EIT, analyzes the research progress and existing problems of the technology from the perspectives of hardware systems, imaging algorithms, and clinical applications (such as lung ventilation, lung perfusion, and lung function assessment), and discusses the development direction to provide ideas for expanding the clinical application of lung EIT.
Electric Impedance ; Humans ; Tomography/methods* ; Lung Diseases/therapy* ; Algorithms

First of all,the overall framework of 3D printing is briefly introduced,including the basic principles of the additive manufacturing process,the classification and summary of the seven processes.Secondly,the common negative Poisson's ratio structure is introduced.Compared with the conventional structure,the negative Poisson's ratio structure has stronger energy absorption capacity,better fracture resistance and better indentation resistance,which are its advantages in printing manufacturing.Finally,3D printing,the application of negative Poisson's ratio structure and the combination of the two are introduced from the different perspective of medical field,for example,the application of cardiovascular stent,biomedical material structure preparation,and lumbar disc implants.This paper suggests that the structural design of negative Poisson's ratio in 3D printing guides the development of new application directions in the medical field.Negative Poisson's ratio materials have a wide range of applications,not only in the medical field but also in mechanical equipment,automotive manufacturing,aerospace,and other high-tech industries.

Rehabilitation assessment is the basis and important part of rehabilitation diagnosis and treatment. At present, clinical evaluation is usually carried out by observation method and scale method. At the same time, researchers monitor patients' physical condition data through sensor system and other equipment as a supplement. The purpose of this study is to review the application and development of objective rehabilitation assessment technology in clinical practice, and to discuss its limitations and strategies to provide reference for related research.
Humans ; Technology ; Rehabilitation

Objective:To explore the feasibility and safety of long-distance urological nephrotomy with the support of 5G communication technology by using the domestic robot.Methods:Clinical data of the patients with remote robot-assisted laparoscopic nephrectomy, which were completed from March to April 2021 by the Affiliated Hospital of Qingdao University (as the host hospital where the main operating system located) were retrospectively analyzed. There were 3 patients, including 2 males and 1 female.The average age was 61 (49-73) years, and the average body mass index was 23.73 (20.00-27.76) kg/m 2. One patient had a ASA classification of grade 2, and the other 2 patients had grade 3. All patients met the surgical criteria for non-functional nephrectomy. The chief surgeon who performing the telesurgery was located at the Affiliated Hospital of Qingdao University. The surgeon remotely controlled the bedside operating system (slave system) in 3 local hospitals located in other cities in Shandong Province (network communication distances of 82.5, 141 and 229 km, respectively) by manipulating the master system located in Qingdao. Images and operating instructions during surgery were transmitted using 5G wireless communication technology. Intraoperative network conditions, robot operation, and patient perioperative data were summarized. Results:All 3 tele-nephrectomies were successfully completed. The average network signal latency time was 27.3 (23-30) ms, with no packet loss, and the average total latency time was 177.3(173-180) ms. The mean resection time was 79.3 (52-111) min, and the average intraoperative blood loss was 31.1 (15.6-41.9) ml. There were no network related adverse events occurred during the operation, and the robot-related adverse events occured 3 times, all three of which were characterized by inconsistent master and slave movements of the manipulator arm and the bedside robotic arm. None of these adverse events affected the successful performance of the telesurgery. The mean postoperative exhaust time was 60.5 (38.5-78.0) h. The mean postoperative VAS score at 24 hours was 3.7 (3-4). The Clavien-Dindo classification were all grade I. No significant abnormality was found on the 30th day after surgery, and the patients recovered well at the follow-up until 6 months postoperatively.Conclusions:It is safe and feasible to perform remote robot-assisted laparoscopic nephrectomy based on 5G communication technology with no serious adverse events or surgical complications.However, the conclusion needs to be further verified by large sample and multi-center prospective study.

Objective:To investigate the prevalence of depressive disorders among school students aged 6-16 years in Beijing, the effect of age and gender on the prevalence, and the behavioral and emotional profiles of identified students with depressive disorders.Methods:The prevalence of depressive disorders in primary and secondary school students aged 6-16 years in Beijing from January 2012 to December 2014 was examined by a multistage stratified random sampling method.In the first stage, the Achenbach′s Child Behavior Checklist (CBCL) was used to identify high-risk children and adolescents.In the second stage, the high-risk group was further screened by Mini International Neuropsychiatric Interview for Children and Adolescents (MINI-KID), and then two psychiatrists made the final diagnosis according to the diagnostic criteria of the fourth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-Ⅳ). This study was a prospective epidemiological investigation.The effect of age and gender on the disease prevalence was analyzed by Chi- square test. Results:About 2.29% (234/10 215 cases) of the school students aged 6-16 years in Beijing had depressive disorders.The incidence of depressive disorders was 1.80% (106/5 866 cases) in boys and 2.94% (128/4 349 cases) in girls.There is an age effect on the prevalence of depression.As the age increases, the morbidity of depressive disorders increases.The age of 12 years was a critical turning point, and the peak incidence was reached at around the age of 15 years.The emotional and behavioral problems of patients with depressive disorders mainly include social problems, withdrawal depressed, anxiety and depressed, somatic complaints, and aggressive behavior.Conclusions:The prevalence of depressive disorders among school students aged 6-16 years in Beijing is 2.29%.Depressive disorders occur in primary and middle school students of all ages.More attention should be paid to the mood of students before and after the entrance exams for junior high school and senior middle school, especially the girls′ mood.In the process of screening, diagnosis and treatment of depressive disorders, the atypical symptoms of depression need to be paid more attention.

Objective:To explore the new generation of intelligent ICU Unit based on 5G and artificial intelligence technology.Methods:This study was conducted at the Second Affiliated Hospital, Zhejiang University School of Medicine from May 2019 to August 2020. Based on a multidisciplinary team including medical, nursing, hospital management, clinical medical engineering, 5G technology, information technology, artificial intelligence technology, logistics service, etc, was assembled to intelligently design and reconstruct an intelligent ICU Unit of Emergency ICU.Results:Based on 5G technology, a new intelligent ICU unit environment was constructed to realize remote and high-speed interaction of multi-dimensional information in ICU, including intelligent assistance of remote monitoring, remote ward rounds, remote consultation and family visits. An intelligent hospital infection prevention and control system was established including automatic identification and alarm of hand hygiene and personal protection.Conclusions:The new generation of intelligent ICU unit combined with 5G and artificial intelligence technology has changed the mode of medical service for critically ill patients and improved the service level, which is worthy of further exploration and application.

In order to solve the problem of continuous monitoring and automatic regulation of patient airbag pressure in intensive care unit, the study designed an intelligent management system of artificial airway airbag pressure. It can realize real-time monitoring and automatic control of airbag pressure. Its pressure data was sent to the PC in real time by the serial port. It can realize the display, store, review and analysis of pressure data. Its clinical application effect was discussed. Experiments showed that the system can monitor airbag pressure in real time and control the pressure to stabilize at 25~30 cmH
Air Bags ; Critical Care ; Humans ; Intensive Care Units ; Monitoring, Physiologic

Ramping-up is the magnet current injection procedure which is under the control of resistance, voltage, current lead temperature, magnet pressure, temperature and so on. In this procedure, the factors related to the stability of the magnet such as, magnet temperature, pressure and currents are constantly changing. This procedure is the main step which the magnet-quench occurs in. This study uses the data collected during 7 years and SIMENS MRI ramping-up theory, in order to help engineers understand the key factors to reduce the magnet quench during the ramping up procedure.
Magnets ; Temperature

Since the outbreak of COVID-19, the hospital is faced with such challenges as sustained input in patient screening, referral and rescue, supportive medical supplies including the management of personal protective supplies and the maintenance of medical equipment. In the face of increasing workload, the medical materials support team of the hospital took the following measures in the principles of " discovering new sources of supplies and minimizing consumption" . These measures taken include proactive supply procurement strategy, prioritizing allocations based on risk exposure, uniform distribution of supplies based on inventory and usage, and traceable management for donated supplies; optimal and central deployment of equipments, emergency installation, pre-maintenance and emergency repairs for equipments; efficient and safe sterilization of reusable materials and equipments using sterilizers; enhanced personnel training and management to keep updating the medical supplies capacity of the team. All these efforts have contributed significantly to the orderly work of epidemic control.

Objective: To evaluate the indication, safety and effectiveness of transoral robotic surgery (TORS) for oropharyngeal cancer based on our preliminary experience. Methods: Twelve patients, including six with tonsil cancer, five with tongue base cancer and one with posterior pharyngeal wall cancer, who underwent TORS with Da Vinci Si surgical system from March 2017 to October 2018 at Tongji Hospital of Huazhong University of Science Technology were respectively analyzed. And the surgical time, intraoperative blood loss, postoperative local bleeding, dyspnea, nerve function injury, oral intake time, whether or not to receive chemoradiotherapy were analyzed. Results: All tumors in the 12 patients were en bloc removed by TORS. Surgical time ranged from 25 to 80 min with an average of 34.2 min. The blood loss ranged from 10 ml to 50 ml with an average of 20.8 ml. The recovery time for oral intake ranged from 1 day to 30 days with an average of 8.4 days. No patient underwent tracheostomy after TORS. Also, no patient manifested with airway obstruction, bleeding or nerve injury symptoms after operation. All 12 patients reached pathologically negative surgical margins. The patients were followed up for 4 to 22 months, with a median of 12 months. All patients who combined with more advanced than T3 stage, or more advanced than N2 stage were recommended to oncologist, then, followed with radiotherapy or chemoradiotherapy if no relevant contradictions occurred. No local recurrence or distant metastasis case was found. Conclusion With proper indications, the application of TORS in oropharyngeal cancer is a relatively safe, effective and minimal invasive therapy, which merits more clinical applications.