This paper proposed a mobile vital-signs monitoring system based on ZigBee localization and wireless transmission technology for the elderly in nursing home. The system can monitor the vital-signs (pulse, ECG and blood oxygen), localize human body and warn in emergency. The validity and accuracy of this system were testified by the experiments of mobile acquisition and storage of pulse. In these experiments, the measurement of pulse ranged from 50 to 170 time a minute, the mean error of which was less than 3%. The mean error of localizing was less than 4 m. And the data transmission rate was 250 kbps. The system, which effectively conducts the real-time monitoring of the health and safety situation for the elderly, has a great significance for protecting the elderly's life safety.
Aged ; Equipment Design ; Homes for the Aged ; Humans ; Monitoring, Physiologic ; instrumentation ; Nursing Homes

Objective To study the material attribute of articular cartilage.Methods An improved 4 parameters inhomogeneous triphasic model based on 3 parameters model was developed to estimate the uniaxial modulus Ha of cartilage and to predict the swelling pattern of cartilage.Results The results showed that more accurate uniaxial modulus can be extracted using 4 parameters inhomogeneous triphasic model,and the predicted results appeared to match the experimental strain data better than other models.Conclusion Inhomogeneous 4 parameters triphasic model can describe the depth-dependent material attribute of articular cartilage more exactly.

This paper proposed a rehabilitation training system with electromyography (sEMG) feedback for stroke patients based on ARM embedded system and LabVIEW. The system can achieve real-time acquisition, processing and dualview of multi-channel sEMGs and compute related sEMG parameters including iEMG, RMS, MPF and co-contraction ratio. The system was detected by clinical experiments and related inspection department. The result showed that the system is functional, interactive and in accordance with the relevant standards for medical devices so that it can fully satisfy the clinical demands. In addition, the system can help doctors to master the training state of the patient more effectively in a real-time and quantitative way that is direct to improve the training programs of stroke patients.
Electromyography ; Humans ; Neurofeedback ; Stroke Rehabilitation

Spinal cord injury is very high morbidity trauma, seriously affecting the survival and health of patients. To establish a standard animal model has a great significance for studying SCI pathogenesis and pathological changes. A spinal cord injury device for experimental animal was presented in this paper. It can implement fixed-point and fixed-quantity impact by new design. It also can create many animal models of different levels injury. More importantly, it has many advantages such as simple to operate, free from human disturbance, high accuracy and reproducibility. Finally, some existing constraints and challenges about the animal spinal cord injury models made by the device were discussed.

Subtle changes in structure or composition can lead to degeneration of articular cartilage such as in osteoarthritis, so it is significant to study the materials attribute of the degenerating articular cartilage. A new transient ultrasonic technique was introduced into this study for measuring the swelling effects of the degenerated cartilage. The swelling-induced strain was calculated based on the measurement result, and then the uniaxial module of the articular cartilag was extracted using Narmoneva's triphasic model. The ultrasonic observation showed that the strains induced by the nonuniform swelling are depth-dependent, and the strains are small in the deep zone and big in the middle and surface zones. The uniaxial modulus also revealed that the cartilage in the deep zone (E1 = 12.20) is harder than that in surface zone (E2 = 0.15). These results suggest that the transient ultrasound technique accompanied by triphasic model provides a quantitative means to study the degeneration of articular cartilage.
Cartilage Diseases ; diagnostic imaging ; Cartilage, Articular ; diagnostic imaging ; physiopathology ; Computer Simulation ; Edema ; diagnostic imaging ; physiopathology ; Humans ; Models, Biological ; Osmotic Pressure ; Ultrasonography

Objective:To investigate the clinical application value of peripheral blood methylation Septin9 gene in peripheral blood combined with SDC2 gene methylation and TFPI2 gene methylation and fecal occult blood test in colorectal lesion screening.Methods:Through random-selection method. Seventy-five patients with colorectal cancer and 50 patients with advanced adenoma who were treated in our hospital from January 2017 to June 2019 were enrolled as the colorectal cancer group and the advanced adenocarcinoma group, respectively, and the results of the negative test were used as controls Methylation-specific PCR (MSP) was used to detect the methylation status of the Septin9, SDC2 and TFPI2 genes in all patients and the fecal occult blood test for colorectal cancer and advanced adenocarcinoma. In addition, the receiver operating characteristic curve (ROC curve) was drawn to compare the diagnostic value of combined detection and individual detection.Results:The positive rate of Septin9, SDC2, TFPI2 methylation and FOBT in colorectal cancer group was 53.04% (61/115 cases), 55.65% (64/115 cases), 59.13% (68/115 cases) and 26.09% (30/115 cases), respectively. The positive detection rates of Septin9, SDC2, TFPI2 methylation and FOBT in the advanced adenoma group were 33.33% (30/90 cases), 50% (45/90 cases), 40.00% (36/90 cases) and 17.78% (16/90 cases), respectively. The detection sensitivity (82.7%) was higher than the sensitivity of each single test and combined detection of SDC2 and TFPI2 gene methylation: Septin9 methylation (66.7%), SDC2 methylation (69.3%), TFPI2 methylation (73.3%), FOBT (26.7%), SDC2 and TFPI2 methylation combined detection (77.3%), while maintaining a high specificity (80.0%). Septin9, SDC2, TFPI2 gene methylation joint inspection screening advanced adenomas detection sensitivity (70.0%) was higher than the sensitivity of each single test and combined detection of SDC2 and TFPI2 gene methylation: (40.0%), SDC2 Septin9 gene methylation gene methylation (64.0%), TFPI2 methylation (50.0%), FOBT (18.0%), SDC2 and TFPI2 gene methylation detection (64.0%), and also maintained a high specificity (82.5%). ROC curve analysis showed that the area under the ROC curve of the three gene methylation combined screening for colorectal cancer was significantly higher than that of Septin9, SDC2, TFPI2 gene methylation, FOBT alone, and SDC2 combined with TFPI2 gene methylation detection (0.684, 0.765, 0.623, 0.796 and 0.566), and the difference was statistically significant ( P<0.05); and the area under the ROC curve of three gene methylation combined screening screening for advanced adenomas was significantly higher than the area under the ROC curve of Septin9, SDC2, TFPI2 gene methylation, FOBT alone, and SDC2 combined with TFPI2 gene methylation (0.568, 0.685, 0.535, 0.723 and 0.489), and the difference was statistically significant ( P<0.05). Conclusions:Combined detection of Septin9, SDC2 and TFPI2 gene methylation can improve the sensitivity of colorectal lesion diagnosis and maintain high specificity. It has the clinical application value for early screening and diagnosis and treatment of colorectal cancer.

Objective To analyze and compare the incidence of postoperative complications of acute gangrene appendicitis after laparotomy and laparoscopic surgery.Methods This study retrospectively analyzed of 162 cases of acute gangrenous appendicitis treated in Xilin Guole Meng Hospital from January 2015 to January 2018.There were 96 male patients and 66 female patients;age (43.40 ± 16.21) years.According to different surgical methods,162 patients were divided into two groups:laparoscopic group (n =80) and open group (n =82).Laparoscopic appendectomy was performed in the laparoscopic group,and open appendectomy was performed in the open group.To compare the postoperative complications intraoperative and postoperative data between the two groups.It consists of tump fistula or bead inflammation,postoperative pneumonia,abdominal hemorrhage,deep venous thrombosis,incisional hernia,subcutaneous emphysema,incision infection,intestinal obstruction,celiac sepsis,complained of pain intensity classification method for pain score and antibiotic use time,postoperative extubation time,postoperative exhaust time,postoperative bed for the first time for the first time time,length of hospital stay.The measurement data were expressed by (Mean ± SD) and the t test was used with the groups.The counting data were expressed by the percentage or rate and the x2 test was used among the groups.When the number of single group cases was less than 10 cases,the Fisher exact probability method was used for the calibration test.Results The top three complications were incision infection,intestinal obstruction and empyema.The incidence of postoperative complications in open group and laparoscopy group was 65.9％ (54/82) and 8.8％ (7/80) respectively,and there was significant difference between the two groups (F =56.247,P=0.000).The VRS of the lapamscopic group and the open group were 53 points and 12 points for grade Ⅰ,18 points and 36 points for grade Ⅱ,and 9 points and 34 points for grade Ⅲ,The results showed that the difference between the two groups was statistically significant (x2 =2.45,P =0.01).The time of antibiotic use,postoperative tube extraction,postoperative first exhaust,postoperative first time out of bed and hospitalization in the laparoscopic group were respectively (61.2 ±24.2) d,(4.2 ± 1.2) h,(24.6 ±6.9) h,(4.6 ±2.2) h,(5.5 ±3.6) d and the open group were (72±72.6) d,(7.4 ±2.7) h,(52.2 ±4.8) h,(8.4 ±2.6) h,(13.5 ±8.2) d respectively,the differences were statistically significant (P ＜ 0.05).Conclusion The postoperative complications in laparoscopic group were lower than those in open group,so the laparoscopic group was the first choice for the treatment of acute appendicitis,while the open group was another choice for some patients.

Objective:To investigate the prevalence of cataracts, the surgical coverage, and postoperative visual acuity of adults in Ningxia.Methods:A cross-sectional study using multistage cluster random sampling was conducted.Ten survey sites in Ningxia were selected and the population aged 18 years and over was surveyed with questionnaire, height and weight measurements, visual acuity, intraocular pressure, fundus photography and slit-lamp examinations.Cataract prevalence and its influencing factors were analyzed.Cataract prevalence, surgical coverage and presenting visual acuity (PVA) and best corrected visual acuity (BCVA) after surgery were investigated in different age groups of the examined population.The study adhered to the Declaration of Helsinki and was approved by the Ethics Committee of the People's Hospital of Ningxia Hui Autonomous Region (No.[2023]-LL-010).Participants signed informed consent prior to the examination.Results:A total of 6 145 people should be examined, and 5 721 people were actually examined, with an examination rate of 93.10%.The study population consisted of 2 558 males, accounting for 44.71%, and 3 163 females, accounting for 55.28%, with ages ranging from 18 to 93 years old and an average age of (64.27±13.48) years.Among them, 1 180 patients diagnosed with cataract, with a cataract prevalence of 20.62%.The prevalence of cataract increased with age and decreased with education level, showing statistically significant differences ( χ2=1 091.32, 581.92; both at P<0.01).The prevalence of cataract was significantly higher among people with hypertension, diabetes mellitus, hyperlipidemia, and coronary heart disease than those without these diseases ( χ2=274.65, 118.15, 78.05, 182.71; all at P<0.01).Cataract surgery was performed in 245 cases in the cataract patient population, with a surgical coverage rate of 20.76%.Of the 245 cases, 229 cases were implanted with IOLs, with an implantation rate of 93.40%.The social burden rate of cataract blindness was 2.29%, and increased with age.Of the 339 eyes that underwent cataract surgery, 241 had a PVA≥0.3, accounting for 71.09%, and 272 had a BCVA≥0.3, accounting for 80.24%. Conclusions:In Ningxia, cataracts are still the main cause of vision impairment and blindness in the elderly, and the social burden rate of cataract blindness is high.Moreover, the coverage rate of cataract surgery is low, so both the coverage and quality of surgery need improvement.

OBJECTIVE: Exploring the effectiveness of using EEG linear and nonlinear features for accessing mental workload in different tasks. METHODS: Working memory tasks with different information types and various mental loads were designed based on N-Back paradigm. EEG signals from 18 normal adults were acquired when tasks were being performed. Linear and nonlinear features of EEGs were then extracted. Indices that can effectively reflect mental workload levels were selected by using multivariate analysis of variance statistical approach. RESULTS: With the increment of task load, power of frontal Theta, Theta/Alpha ratio, and sample entropies (scales>10) in parietal regions increased significantly first and decreased slightly then, while the power of central-parietal Alpha decreased significantly first and increased slightly then. No difference in power of frontal Theta, central-parietal Alpha, and sample entropies (scales>10) of parietal regions were found between verbal and object tasks, as well as between two spatial tasks. No difference of frontal Theta/Alpha ratio was found in all the four tasks. CONCLUSIONS The results can provide evidence for the mental workload evaluation in tasks with different information types.
Electroencephalography ; Memory, Short-Term ; Workload

OBJECTIVETo propose a square's ring motion stimulation based on steady-state motion visual evoked potential, and compare it with the commonly used visual stimulation modes (Newton's ring motion, square flicker and circular flicker).

METHODSEEG signals were collected while 9 experimental subjects gazing at four stimulation and pattern analyzed by Canonical Correlation Analysis (CCA). Stimulation were evaluated by recognition accuracy and subjective scores.

RESULTSThe classification accuracies of SSVEP elicited by the square's ring motion(82.8%±14.1%) and Newton's ring(83.3%±11.5%) have no significant difference between them, which are lower than that of the square flicker(98.3%±4.1%) and the circular flicker(99.2%±1.8%). The shape of the figure has no significant influence on the classification accuracy either in motion mode or flicker mode. The comfort of the square's ring motion is higher than the other three stimulation according to subjective scores.

CONCLUSIONSThe square's ring motion can elicit EEG and reduce the discomfort caused by flicker modes. The square's ring motion can be used as a visual stimulation in SSMVEP-based BCI system.