In the early report of Swedish scholars, this ventilation method was named as high-frequency low-tidal volume positive pressure ventilation (HFPPV). Scholars noticed that the central venous pressure was low and changed little when using HFPPV ventilation, with an average of 1mmHg, and the peak airway pressure was only 8 ~ 12 cmH2O. During ventilation, the intrathoracic pressure remained negative, the arterial pressure, central venous pressure and pulmonary artery pressure did not fluctuate obviously, and the pulmonary artery wedge pressure changed.
Sanders, another Swedish scholar, first invented high-frequency jet ventilation. This technology is that hyperbaric oxygen flows through a tiny needle and is injected into the airway, and the air at the needle mouth is sucked together and injected into the airway by the principle of Venturi effect.
Klia and Smith in the United States closely combined jet ventilation and high-frequency ventilation technology and designed a new type of breathing machine to perform high-frequency intermittent jet ventilation (HFJV). The high-frequency jet breathing machine they used was jet technology, with a frequency of .5 ~ 5 Hz or even higher per minute, and a large number of animal experiments were carried out on its ventilation methods. The research on high-frequency ventilation attracted many scholars' interest and greatly promoted it.
In p>1978, the high-frequency jet ventilation was tested in Cao Yong with the method of welding spray gun, and good results were obtained. Since 198, Cao Yong and Li Zongyi have developed the first generation of high-frequency jet ventilator, which has created favorable conditions for the wide application of high-frequency ventilation technology in China.
in addition to the above work, Ji Woong Choung imported Bird ventilator into a device for high-frequency jet ventilation, and Liu Huaiqiong and others also changed Shanghai-made SC-2 domestic ventilator into a high-frequency jet ventilator with 6 beats/min, which also achieved good results in clinical use. Cao Yong introduced this at the first national anesthesia academic conference, exchanged clinical experience and reported it one after another, which contributed to the nationwide research of high-frequency ventilation technology.
with the development of high-frequency jet ventilator, the research on high-frequency ventilation and the discussion on its technical principle are carried out in a large scale throughout the country. First, high-frequency jet ventilation technology is widely used in respiratory management and respiratory support during anesthesia, and it has been successfully used in some special operations, and successful experience has been obtained. At the same time, academic research on high-frequency ventilation has been widely carried out. Since 1983, Jiangxi Anesthesiology Society, Respiratory Society and Pediatric Society have successively held three academic seminars on high-frequency ventilation, and collected a large number of research papers, which comprehensively exchanged the methods, mechanisms, clinical applications and instrument design of high-frequency ventilation, laying a good foundation for widely popularizing high-frequency ventilation technology.
In p>1985, high-frequency ventilation technology won the third prize of national scientific and technological invention, and then Cao Yong and Li Zongyi won the national promotion award of this technology. The application of high-frequency ventilation technology and high-frequency breathing equipment have spread all over the country in more than 3 provinces, municipalities and autonomous regions, most of which are first-class hospitals in provinces, cities and counties, and some are basically popularized in commune hospitals, factories, mines and military hospitals.