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Objective To study the effect of interlocking intramedullary nail on fixing transverse olecranon fracture. Methods Nine pairs of fresh ulna specimens were collected and the transverse fracture model of olecranon was established. Kirschner wire tension band and interlocking intramedullary nail were used to repair the fracture. Cyclic dynamic tension loads with amplitude of 25 N, mean value of 45 N and frequency of 05 Hz were applied to the triceps tendon under simulated elbow flexion conditions of 30°, 45° and 60°, respectively. The fracture displacements of specimens within 300 cycles were recorded in three groups. ResultsAt 30° flexion angle, the fracture displacement of interlocking intramedullary nail group and Kirschner wire tension band group was (1.831±0.333) mm and (3.723±2.390) mm, respectively. At 45° flexion angle, the fracture displacement of interlocking intramedullary nail group and Kirschner wire tension band group was (1.167±0.374) mm and (2.455±0.609) mm, respectively. At 60° flexion angle, the fracture displacement of interlocking intramedullary nail group and Kirschner wire tension band group was (1.407±0.342) mm and (3.112±1.025) mm, respectively. The fracture displacement of interlocking intramedullary nail was smaller. Conclusions The mechanical properties of interlocking intramedullary nail are better than those of Kirschner wire tension band, and the interlocking intramedullary nail is more stable and firmer for fixing transverse olecranon fracture. Moreover, the interlocking intramedullary nail is installed with the operating tool, thus the operation is more accurate and faster, and the operation efficiency is greatly improved.
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BACKGROUND: Studies have shown that there are differences in the biomechanics of different internal fixation methods to fix the acetabular posterior column fracture. OBJECTIVE: To simulate the acetabular posterior column fracture and evaluate the stability of the acetabular posterior column with three fixation methods. METHODS: Thirty-six cadaveric hemipelvic specimens were collected to establish models of acetabular posterior column fracture. The models were randomly divided into three groups, and were fixed by three different fixation methods: (short iliosciatic plate in group A, traditional posterior plate in group B, and long iliosciatic plate in group C; n=12 per group). Mechanical loads were applied vertically in standing and sitting positions. The fracture ends displacement and biomechanical stability were evaluated by using image displacement method. RESULTS AND CONCLUSION: (1) In the standing position, the relative displacement of the fracture ends of the three groups was positively correlated with the load; there was no statistically significant difference in the displacement of the fracture ends under the same load in the three groups (P > 0.05). When loaded with a load of 1 800 N, the relative displacement of each group of models did not exceed 3 mm. (2) In the sitting position, the relative displacement of the fracture end was positively correlated with the size of the load; the relative displacement of the three groups under the same load was significantly different (P < 0.05). Under the same load, the relative displacement of group B was greater than that of groups A and C; the relative displacement of group A under 100-500 N load was greater than that of group C, and the relative displacement under 600 N load was smaller than that of group C. (3) The results suggested that the iliosciatic plate fixation of the acetabular posterior column fracture can provide the same biomechanical stability as the traditional posterior column steel plate, and the rigidity of the fixed structure is high, which can meet the postoperative rehabilitation needs.
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Objective:To explore the influence of family caregiver empowerment intervention model on discharge preparation and quality of life of patients with lung cancer undergoing chemotherapy.Methods:From January 2019 to January 2020, 84 lung cancer patients who received chemotherapy in the Department of Respiratory Medicine in the First Affiliated Hospital of Zhengzhou University were selected, each patient chose one family primary caregiver. It was divided into the control group and the intervention group by the draw method with 42 cases in each group. The control group received routine nursing intervention of internal medicine chemotherapy, and the intervention group received empowerment intervention of main family caregivers on the basis of the control group. The effect of family caregiver empowerment intervention mode were investigated by observing the discharge readiness and quality of life of lung cancer patients.Results:There was no significant difference in the preparation for discharge and quality of life between the two groups before intervention ( P>0.05); after three cycles intervention, the total scores of discharge readiness and quality of life in the intervention group were (76.30±2.80), (94.05±3.70), which were significantly better than those in the control group(73.02±3.73), (87.44±4.18), and the differences were statistically significant ( t values were -4.464, -7.527, P<0.01). Conclusions:Empowerment intervention model of family caregivers can improve the discharge readiness and quality of life of lung cancer patients undergoing chemotherapy.
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Risk management of medical devices covers the whole life cycle of medical devices, which is of great significance to the life safety and health condition of patients. The existing risk management of medical devices, especially the risk analysis in the research and development stage, often becomes a mere formality. The special risks faced by the research and development products in the clinical application scenarios are not well addressed. This study proves the necessity and importance of the combination of risk analysis and clinical application in the research and development stage of medical devices by the analysis of several special hazard sources in the process of clinical application of portable emergency ventilator.
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Humans , Home Care Services , Risk Management , Ventilators, MechanicalABSTRACT
Objective To investigate the clinical effect of coracoclavicular ligament reconstruction by getting tendon palmaris longus for treating acromioclavicular joint dislocation under arthroscopically assisted Endobutton steel plate fixation.Methods Eighteen patients with acute closed acromioclavicular joint dislocation treated in this hospital from January 2013 to March 2015 were selected and treated by coracoclavicular ligament reconstruction by getting tendon palmaris longus and double Endobutton steel plate fixation under arthroscopy.The visual analogue scale(VAS) was adopted before and after operation.The Karlsson treatment effect score was adopted at the end of follow up period.The patients satisfaction was investigated.Results The wounds in 18 cases were stage Ⅰ first grade healing and the reduction of acromioclavicular joint dislocation was good.The postoperative VAS score was(0.56±0.62) points,which was significantly decreased compared with(2.44± 1.20) points before operation(t=5.945,P＜0.01).During the follow-up visit,1 case appeared dislocation recurrence and treated by adopting clavicle hook plate fixation;average follow up time was 17.72 months,the Karlsson score at the end stage was excellent in 12 cases,good in 5 cases and poor in 1 case,the excellent and good rate was 94.44 ％,the patient satisfaction degree was 88.89 ％.Conclusion Arthroscopically assisted Endobutton steel plate fixation combined with ligament reconstruction by tendon palmaris longus for treating acromioclavicular joint dislocation has small trauma and reliable fixation,and promotes the joint function recovery.
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<p><b>BACKGROUND</b>Large animal cardiopulmonary bypass (CPB) models are expensive, and prevent assessment of neurocognitive function, and difficulties with long-term recovery. The purpose of this study was to establish a novel rat model of cardiopulmonary bypass for deep hypothermic circulatory arrest without blood priming.</p><p><b>METHODS</b>Twenty adult male Sprague-Dawley rats weighing 450-560 g were randomized to CPB with deep hypothermic circulatory arrest (DHCA) and control groups, with 10 rats each. The experimental protocols, including blood and crystalloid fluid administration, anesthesia, orotracheal intubation, ventilation, cannulation, and heparinization were identical in both groups. After inducing cardiac arrest, the circuit was turned off and rats were left in a DHCA state for 15 minutes. Rats were rewarmed to 34°C to 35°C over a period of 36 to 42 minutes using CPB-assisted rewarming, a heating blanket, and a heating lamp along with administration of 0.1 mEq of sodium bicarbonate and 0.14 mEq of calcium chloride. The remaining priming volume was reinfused and animals were weaned from CPB.</p><p><b>RESULTS</b>All CPB with DHCA processes were successfully achieved. Blood gas analysis and hemodynamic parameters were in the normal range. The vital signs of all rats were stable.</p><p><b>CONCLUSIONS</b>Our CPB circuit has several novel features, including a small priming volume, active cooling/rewarming processes, vacuum-assisted venous drainage, peripheral cannulation without thoracotomy or sternotomy, and an accurate means of monitoring peripheral tissue oxygenation.</p>
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Animals , Male , Rats , Cardiopulmonary Bypass , Methods , Circulatory Arrest, Deep Hypothermia Induced , Methods , Models, Animal , Rats, Sprague-Dawley , Rats, WistarABSTRACT
Fitting formulas of typical parameters were obtained through analysis of anthropometric parameters of armored car driver and operators. These formulas could be a basis for design of product and equipment of cars, cumulating and updating of basic data of similar sample and edition of relative standards. 76 anthropometric static parameters and 11 functional parameters were chosen, and 1 243 soldiers with armored forces were chosen to be tested. The correlation and fitting formulas of body height, sitting height and other parameters were measured and obtained. We also contrasted measured data with data from GJB1835-1993. The present analysis showed that the correlation between sizes of body length and body height and sitting height was significant. Sizes of body length and enclose size and width direction were all increased compared to those in the 1980s. The present results were consistent with other researchers' current research results. The measured data could be an important basis for the data of young male anthropometric parameters and edition of relative standards and design of specific equipment.