Objective:To design idea and principle of pressure monitoring functions with a dynamic pressure monitoring function of enteral nutrition pump and method of realizing. Methods:On the base of the existing infusion pump liquid principle, summarize the clinical practical experience, put forward to avoid mechanical complications of enteral nutrition support in May by dynamic pressure monitoring transfusion process. Results:The design idea of exposition, analysis and summary of the design process, raise the reasonable design scheme. Conclusion:The current development of China's enteral nutrition pump in the weak stage, Hope the study design can provide help for the domestic independent R&D enteral nutrition pump.

Objective To analyze the power interference during ECG machine testing and to propose countermeasures.Methods Some measures in power supply stability, shielding, grounding and wire winding were carried out to reduce the influences of 50 Hz interference on ECG machine testing.Results The influences of the power interference were reduced greatly on ECG machine.Concluslon The performances of ECG machine can be ensured by restraining the power interference.

Objective: To supply the quality of hospital centers, conduct research and analysis, develop appropriate purification scheme. Methods: According to the specific hospital ward equipment used and production center with the use of state gas sampling filter device;through the device each ward of the hospital wards with a central gas sampling equipment, comparison and analysis. Results:through the filter sampling, analysis of equipment with a gas composition of trace impurities, impurities resulting inferred parts, the first time to get in touch with the manufacturers to jointly negotiate improvement programs. Conclusion:Hospital Center survey analysis is a gas quality monitoring and promotion of the development, the need to promote open each hospital to develop a central supply more complete safety indicators. Such a center gas quality testing program can be more effective in protecting the quality of gas supply, more conducive to clinical treatment and use.

Objective To evaluate conventional ultrasound combined with real-time elastography in differential diagnosis of metastatic axillary lymph nodes of breast cancer with a logistic regression model.Methods Conventional ultrasound and real-time elastography were performed in 112 breast cancer patients with 113 axillary lymph nodes.All the cases were confirmed with pathological examinations after surgery. A binary logistic regression model based on ultrasonographic features was developed.A receiver operator characteristic ( ROC) curve was constructed to assess the performance of the model.Results There were 28 nodes with no metastasis and 85 with metastasis in a total of 113 axillary lymph nodes.Three ultrasonographic features including the elastic strain ratio(SR), elastic score and shape were finally selected into the logistic regression model .The correct rate of the logistic regression model for predicting axillary lymph node metastasis was 93.8%, and the area under ROC curve was 0.962.Conclusion The binary classification logistic regression model has a good diagnostic efficacy in the diagnosis of benign and malignant axillary lymph nodes,while real-time elastography can improve the accuracy of conventional ultrasound in the diagnosis of axillary lymph nodes.

Objective: To compare the measurement accuracy of two⁃dimensional (2D) photography and three⁃di⁃mensional (3D) photography in the analysis of the asymmetric appearance of children with cleft lip and palate and the influence of the severity of asymmetric deformity on the accuracy of facial measurement to guide clinical measurement work Methods: Children with unilateral cleft lip were enrolled in this prospective study. Seven parameters⁃⁃the devia⁃tion of the pronasale, subnasale, and labrale superius, as well as the cleft/noncleft ratio of the width of nostrils, length and height of lateral lips and height of columella⁃were measured with Vernier calipers as the gold standard. Traditional 2D photography and 3D stereophotogrammetry photos were taken and measured. The extent of cleft malformation is indi⁃cated by the ratio of the cleft side to the noncleft side. The error size is represented by the ratio difference between two⁃dimensional photography or stereophotogrammetry with the ratio of the gold standard Results: Thirteen patients were eventually recruited. The measurement results of the ratio of lateral lip height by 2D photography tended to be larger (P＝0.019), and the measurement results of the ratio of columella height tended to be smaller (P＝0.008). The measure⁃ment results of the deviation of the subnasale by stereophotogrammetry tended to be smaller (P＝0.003). The pronasale deviation (P＝0.022) with two⁃dimensional photography, the deviation of the labrale superius (P＝0.025) and the ratio of lateral lip length (P＝0.036) with stereophotogrammetry had a significant negative correlation with the extent of cleft malformation Conclusion Both two⁃dimensional photography and stereophotogrammetry have errors and biases that underexaggerate or overexaggerate the extent of cleft malformation, and some errors may increase with the decrease in the extent of cleft malformation. When applying two⁃dimensional and three⁃dimensional photography to analyze cleft lip and palate deformities, these biases should be considered to evaluate the face more objectively