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@#The lifespan of medical equipment depends on preventative maintenance. Properly functioning oxygen concentrators are the only practical sources of oxygen in many Low & Middle Income Countries and their use reduces mortality in hospitalised children. We provided 82 concentrators with pulse oximeters, split flow meters, oxygen tubing, and an oxygen analyser to 38 health facilities. Training and instructions on how to perform preventative maintenance were provided. The concentrators were monitored for three years after they were installed, by assessing the proportion of concentrators still producing optimal oxygen at greater than 85% purity, the proportion that underwent weekly maintenance checks, and the proportion that were faulty and repaired. A logbook for weekly documentation of performance, maintenance, faults and repairs, was employed. Faults were additionally identified by a biomedical engineer during the visits. Twenty nine oxygen concentrators underwent regular maintenance checks, 25 (86.2%) of which had a median of 30 (IQR: 9 - 65) checks. Twenty-four were functioning well throughout the three years. One concentrator was used for 23,807 hours before requiring repair. Fourteen (24%) of the 58 concentrators used at the start of the programme had problems, two were repaired, and 12 were replaced. Concentrator failure was mostly caused by excessive movement, dust, and leaking in the internal tubing. Routine preventative maintenance, thorough documentation of performance and reporting of problems, and having access to clinicians and a knowledgeable biomedical engineer are essential for oxygen concentrator longevity in health care facilities in low-resource settings.
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Objective To improve the oxygen concentrator in the medical gas pipeline system according to standard YY 1468-2016 Oxygen concentrator air supply system for medical gas pipeline system.Methods Standard YY 1468-2016 about to be implemented was analyzed based on standard YY/T 0298-1998 Medical molecular sieve oxygen generator general technical specification.Management measures were proposed for the oxygen concentrator according to standard YY 1468-2016.Results The oxygen concentrator in the medical gas pipeline system was optimized so that the requirements of compulsory standards were met.Conclusion The oxygen concentrator in the medical gas pipeline system has to be enhanced in running,supervision and management to meet the requirements of the new standard.
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This paper is to explore the feasibility of molecular sieve oxygen generator in the supply of oxygen in hospital. By introducing the different principles of oxygenation technology of pressure swing adsorption and oxygenation technology of heavy cooling, this article compared the merits of two ways in national regulations, safety, convenience, and economical efficiency. Oxygenation technology of pressure swing adsorption was more advanced, more automated and life-longer compared with cylinder oxygen supply and central oxygen supply. Molecular sieve oxygen generator is a new generation of oxygen generating equipment with a good application prospect, and can provide a better choice for hospital oxygen supply.
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BACKGROUND: Oxygen concentrators are convenient to operate and economical for patients with chronic obstructive pulmonary disease (COPD). However, oxygen concentrators are not manufactured domestically and the COPD patients are currently treated with imported oxygen concentrators. To evaluate the efficacy and safety of domestically developed prototype oxygen concentrator before clinical application, the efficacy and safety of the domestic oxygen concentrator were evaluate by comparing with the imported one. Meterial and METHODS: The clinical tests were performed on 36 hyperhydrosis patients from April 1999 to August 1999. Domestic and imported oxygen concentrators were in turn applied to the same patient, who inspired oxygen for 60 minutes at a rate of 3 liters per minute through nasal prong. The oxygen concentrator, which was applied first, was randomly allocated. The arterial partial oxygen pressure (PaO2) was estimated to compare the efficacy; and the carboxy hemoglobin(COHb), pH, arterial CO2 partial pressure, pulse rate, blood pressure, and respiration rate to compare the safety before and after applying each oxygen concentrator. A student t-test was used to analyze the results. RESULTS: In respect to efficacy, the difference in the change of PaO2 before and after the application between two concentrators was not statistically significant. In respect to safety, the differences in the changes of COHb, pH, partial pressure of arterial CO2, pulse rate, blood pressure, respiration rate between two concentrators were also not statistically significant. CONCLUSION: The domestically developed oxygen concentrator, showed satisfactory efficacy and safety when compared with the imported one.
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Humans , Blood Pressure , Heart Rate , Hydrogen-Ion Concentration , Oxygen , Partial Pressure , Pulmonary Disease, Chronic Obstructive , Respiratory RateABSTRACT
Objective To assess the performance of onboard oxygen generating and supplying system. Methods A model of a person and 8 volunteers in hypobaric chamber and rapid decompression chamber underwent the tests of producing oxygen ability of the oxygen concentrator of board oxygen generating system normal performance tests on oxygen supply at 0～8 000m, performance tests at cruising altitude for longrange, warning performance tests, secondary oxygen switch tests, positive pressure oxygen performance tests and rapid decompression performance tests. Results All the ability of producing and supply of oxygen, and the normal and the emergency performance of onboard oxygen generating system could fulfill the system physiological requirements. Conclusion On board oxygen generating and supplying system could meet pilots normal and emergeney needs when pilots aviate for long range in high altitude.
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BACKGROUND: For the patient with chronic obstructive pulmonary disease requiring long-term oxygen therapy, oxygen concentrator machines are already widely available for use in home. In this study, we used mongrel dogs as test subjects to compare the functional efficiency and safety of the oxygen concentrator developed by our own research team with those of the imported FORLIFE (TM) machine made by AIRSEP Corp. Method and method: To test mechanical reliability, the concentrations of oxygen delivered were measured after 4 hours of continuous operation. Sixteen mongrel dogs were divided into two equal groups. Mongrel dogs in group A were given oxygen using the imported oxygen concentrator, and those in group B using the machine developed. 5 l/min of oxygen were given, after which vital signs were analyzed, arterial blood gases measured, and blood chemistry tests carried out. RESULTS: After 4 hours of continuous operation, the imported model performed better, giving 98+/-3% oxygen, compared to our model, which gave 91+/-1%. In the animal experiments, oxygen concentrations were measured at the inlet of face mask 1, 2, 3, and 4 hours after continuous administration, and there was no statistically significant difference (repeated measures of analysis of variance p=0.70) between the values of 70.6+/-2.5%, 67.1+/-2.9%, 68.2+/-2.6%, and 64.9+/-3.9% that were measured from group A, and the values of 65.1+/-4.8%, 65.2+/-3.6%, 68.7+/-4.3%, and 66.0+/-5.0% measured from group B. Before oxygen administration, and at 1, 2, 3, and 4 hours after oxygen administration, arterial blood partial pressure of oxygen 87.2+/-2.5 mmHg, 347.4+/-29.3 mmHg, 353.4+/-21.2 mmHg, 343.0+/-28.8 mmHg, and 321.6+/-24.4 mmHg, respectively, were read from group A, which were not statistically different (p=0.24) to the values of 102.5+/-9.6 mmHg, 300.3+/-17.1 mmHg, 321.6+/-23.7 mmHg, 303.4+/-27.4 mmHg, and 273.5+/-25.9 mmHg read from group B. Nonetheless, the arterial blood partial pressure of oxygen values appear to be somewhat higher in dogs that were given oxygen using the imported oxygen concentrator. CONCLUSIONS: From these results the prototype oxygen concentrator developed appears to function relatively satisfactorily compared to the imported, established model, but may be criticized for the excessive noise generated and poor long-term endurance or consistency, which need improvement.