A new kind of volume control hydraulic press that combines the advantages of both hydraulic and SRM(switched reluctance motor) driving technology is developed.Considering that the serious dead zone and time-variant no...A new kind of volume control hydraulic press that combines the advantages of both hydraulic and SRM(switched reluctance motor) driving technology is developed.Considering that the serious dead zone and time-variant nonlinearity exist in the volume control electro-hydraulic servo system,the ILC(iterative learning control) method is applied to tracking the displacement curve of the hydraulic press slider.In order to improve the convergence speed and precision of ILC,a fuzzy ILC algorithm that utilizes the fuzzy strategy to adaptively adjust the iterative learning gains is put forward.The simulation and experimental researches are carried out to investigate the convergence speed and precision of the fuzzy ILC for hydraulic press slider position tracking.The results show that the fuzzy ILC can raise the iterative learning speed enormously,and realize the tracking control of slider displacement curve with rapid response speed and high control precision.In experiment,the maximum tracking error 0.02 V is achieved through 12 iterations only.展开更多
Background: Abdominoplasty is a commonly requested procedure for aesthetic improvement of the affected soft tissue layers of skin, fat, and muscle through the slightest incision feasible. The degree of plicature gener...Background: Abdominoplasty is a commonly requested procedure for aesthetic improvement of the affected soft tissue layers of skin, fat, and muscle through the slightest incision feasible. The degree of plicature generates an increase in intraabdominal pressure that causes an increase in intrathoracic pressure. Pressure, volume, flow, and respiratory rate are components of a unique physical variable, the mechanical power (MP), and is an integrated variable linked to most factors related to postoperative pulmonary complications. Purpose: To assess the effect of rectus plication (RP) during abdominoplasty on lung pressures and the contribution to increasing the MP. Method: A open-label study was conducted at TJ Plast Advanced Center for Plastic Surgery in Tijuana, México, from September 2021 to May 2022. The study included forty-six female patients subjected to abdominoplasty or liposuction with abdominoplasty. After the induction of general anesthesia and neuromuscular blockade, they were allocated into two groups: Group 1 pressure control ventilation-volume guaranteed (PCV-VG) and Group 2 volume control ventilation (VCV). Respiratory pressures and MP were assessed before and after RP. Results: During VCV, patients had a greater increase in peak pressure (PIP) (P 0.000). Plateau pressure (P<sub>plat</sub>) increased 1.78 ± 0.35 cmH<sub>2</sub>O in group 2 after RP (P = 0.001). MP had a greater increase in group 2 after RP (P 0.01). Conclusion: This prospective study showed that RP is related to an increase in PIP and P<sub>plat</sub> and an increase in the MP better controlled with PCV-VG ventilation.展开更多
Objective: to observe the clinical effect of pressure-regulated volume-controlled ventilation (PRVC) combined with Saber c1007 (cardiopulmonary resuscitator) on cardiopulmonary resuscitation in patients with respirato...Objective: to observe the clinical effect of pressure-regulated volume-controlled ventilation (PRVC) combined with Saber c1007 (cardiopulmonary resuscitator) on cardiopulmonary resuscitation in patients with respiratory and cardiac arrest. Methods: a total of 90 patients who received cardiopulmonary resuscitation due to cardiac arrest in the emergency department of our hospital from 2016 to 2020 and were eligible for the study were selected. All patients received standard chest compressions using Sabo c1007 , and the mechanical ventilation mode was selected: The experimental group used PRVC (pressure regulation volume control), control group 1 using VSV (volume support ventilation), control group 2 using PSV (pressure support ventilation), observe the basic conditions of the three groups of patients, the success rate of resuscitation (ROSC success rate), after successful cardiopulmonary resuscitation Respiratory mechanics indexes and blood gas analysis results were analyzed and compared using statistical methods. Results: (1) There was no statistical significance in the comparison of the basic conditions of the patients in each group. (2) The number of successful resuscitations in the experimental group was higher than that in the control group 1 and the control group 2, and the difference was statistically significant (P0.05, χ27.569). (3) The PaO2 and OI of the experimental group were higher than those of the control group 1 and the control group 2, and the differences were statistically significant (F19.604, 103.576, P0.001), and the CVP and PIP of the experimental group were lower than those of the control group 1, There were statistically significant differences between the two control groups (F7.82, 10.731, both P0.05). There was no significant difference in PaCO2 and MAP between the groups (all P>0.05). Conclusion: PRVC can improve the resuscitation success rate of patients with respiratory and cardiac arrest, and the PRVC mode has a good ability to maintain the patients tidal volume and blood oxygen saturation during cardiopulmonary resuscitation. After successful resuscitation, the patients human-machine coordination is good. It has a higher improvement on PaO2 and OI.展开更多
基金Project(2007AA04Z144) supported by the National High-Tech Research and Development Program of ChinaProject(2007421119) supported by the China Postdoctoral Science Foundation
文摘A new kind of volume control hydraulic press that combines the advantages of both hydraulic and SRM(switched reluctance motor) driving technology is developed.Considering that the serious dead zone and time-variant nonlinearity exist in the volume control electro-hydraulic servo system,the ILC(iterative learning control) method is applied to tracking the displacement curve of the hydraulic press slider.In order to improve the convergence speed and precision of ILC,a fuzzy ILC algorithm that utilizes the fuzzy strategy to adaptively adjust the iterative learning gains is put forward.The simulation and experimental researches are carried out to investigate the convergence speed and precision of the fuzzy ILC for hydraulic press slider position tracking.The results show that the fuzzy ILC can raise the iterative learning speed enormously,and realize the tracking control of slider displacement curve with rapid response speed and high control precision.In experiment,the maximum tracking error 0.02 V is achieved through 12 iterations only.
文摘Background: Abdominoplasty is a commonly requested procedure for aesthetic improvement of the affected soft tissue layers of skin, fat, and muscle through the slightest incision feasible. The degree of plicature generates an increase in intraabdominal pressure that causes an increase in intrathoracic pressure. Pressure, volume, flow, and respiratory rate are components of a unique physical variable, the mechanical power (MP), and is an integrated variable linked to most factors related to postoperative pulmonary complications. Purpose: To assess the effect of rectus plication (RP) during abdominoplasty on lung pressures and the contribution to increasing the MP. Method: A open-label study was conducted at TJ Plast Advanced Center for Plastic Surgery in Tijuana, México, from September 2021 to May 2022. The study included forty-six female patients subjected to abdominoplasty or liposuction with abdominoplasty. After the induction of general anesthesia and neuromuscular blockade, they were allocated into two groups: Group 1 pressure control ventilation-volume guaranteed (PCV-VG) and Group 2 volume control ventilation (VCV). Respiratory pressures and MP were assessed before and after RP. Results: During VCV, patients had a greater increase in peak pressure (PIP) (P 0.000). Plateau pressure (P<sub>plat</sub>) increased 1.78 ± 0.35 cmH<sub>2</sub>O in group 2 after RP (P = 0.001). MP had a greater increase in group 2 after RP (P 0.01). Conclusion: This prospective study showed that RP is related to an increase in PIP and P<sub>plat</sub> and an increase in the MP better controlled with PCV-VG ventilation.
文摘Objective: to observe the clinical effect of pressure-regulated volume-controlled ventilation (PRVC) combined with Saber c1007 (cardiopulmonary resuscitator) on cardiopulmonary resuscitation in patients with respiratory and cardiac arrest. Methods: a total of 90 patients who received cardiopulmonary resuscitation due to cardiac arrest in the emergency department of our hospital from 2016 to 2020 and were eligible for the study were selected. All patients received standard chest compressions using Sabo c1007 , and the mechanical ventilation mode was selected: The experimental group used PRVC (pressure regulation volume control), control group 1 using VSV (volume support ventilation), control group 2 using PSV (pressure support ventilation), observe the basic conditions of the three groups of patients, the success rate of resuscitation (ROSC success rate), after successful cardiopulmonary resuscitation Respiratory mechanics indexes and blood gas analysis results were analyzed and compared using statistical methods. Results: (1) There was no statistical significance in the comparison of the basic conditions of the patients in each group. (2) The number of successful resuscitations in the experimental group was higher than that in the control group 1 and the control group 2, and the difference was statistically significant (P0.05, χ27.569). (3) The PaO2 and OI of the experimental group were higher than those of the control group 1 and the control group 2, and the differences were statistically significant (F19.604, 103.576, P0.001), and the CVP and PIP of the experimental group were lower than those of the control group 1, There were statistically significant differences between the two control groups (F7.82, 10.731, both P0.05). There was no significant difference in PaCO2 and MAP between the groups (all P>0.05). Conclusion: PRVC can improve the resuscitation success rate of patients with respiratory and cardiac arrest, and the PRVC mode has a good ability to maintain the patients tidal volume and blood oxygen saturation during cardiopulmonary resuscitation. After successful resuscitation, the patients human-machine coordination is good. It has a higher improvement on PaO2 and OI.
