Design Of Intelligent Portable Ventilator

Chronic obstructive pulmonary disease,obstructive sleep apnea syndrome,asthma,and other respiratory diseases are common diseases of the respiratory system,and their incidence rates have been increasing year by year,resulting in a progressively higher mortality rate.These diseases significantly affect the health level of the population,and thus the prevention and treatment of respiratory system diseases should not be ignored.For patients with the above diseases,assisted ventilation and forced oxygen supply need to be achieved through a respirator to improve respiratory function,conserve cardiac reserve capacity,maintain vital signs,and provide support for rescue treatment,thus buying time.Based on this,this study proposes the development of an intelligent and portable non-invasive positive pressure ventilator system with small size and portability,human-machine interaction,real-time monitoring of multiple respiratory and physiological parameters,diverse ventilation modes,respiratory abnormality alarms,data storage,and other functions.This system can provide timely feedback through physiological monitoring and can be used in multiple scenarios,such as home,hospital,and emergency situations.This paper focuses on the research background,significance,development history,and current research status of portable ventilator systems,references relevant standards and specifications,clarifies the technical indicators and functional requirements of the system,and proposes the overall design and detailed implementation plan for an intelligent portable ventilator system.At the hardware design level,key components such as sensors and fans are selected,and hardware circuit design and system airway design are completed,including the main control module,fan drive module,data acquisition module,multiple physiological parameter monitoring module,and data communication module.Data acquisition is divided into pressure,flow,and temperature/humidity acquisition,and multiple physiological parameter monitoring includes monitoring of carbon dioxide concentration,oxygen concentration,and pulse blood oxygen saturation.At the key algorithm design level,the breathing trigger algorithm is based on the flow change rate threshold,which triggers respiratory pressure switching and respiratory parameter calculation,analyzes system leakage to complete leakage compensation,and the fan control is based on the fuzzy PID control algorithm.The monitoring of respiratory pause events is based on the judgment of the flow value’s degree of discretization,and the monitoring of hypopnea events is based on the magnitude of the inspiratory tidal volume.At the software design level,the lower-level software design is completed to realize system initialization,signal acquisition and monitoring,data transmission and reception,and fan output control.Meanwhile,the upper-level software design is completed,which includes serial communication,real-time waveform drawing,key respiratory parameter calculation,multiple physiological parameter monitoring,ventilation mode setting,abnormal respiratory state monitoring,and data storage functions.The communication between the upper and lower levels is achieved using wireless Bluetooth technology.In order to verify the performance of the designed intelligent portable non-invasive positive pressure respiratory machine system,tests were conducted on various key indicators after the system was fully integrated.According to the system test results,the detection accuracy of pressure and flow rate data met the relevant standards,the precision and response time of the fan control met the expected targets,and the calculation of key respiratory and physiological parameters complied with the relevant standards.The system accurately identified the respiratory status and operated stably under four ventilation modes,while promptly alarming when abnormal respiratory states occurred.In summary,the key technical indicators and functional requirements of the intelligent portable non-invasive positive pressure respiratory machine designed in this project meet the expected standards,laying a foundation for clinical applications.