OBJECTIVE:To prepare Carbinoxamine maleate sustained-release suspension,and evaluate its quality. METH-ODS:Using carbinoxamine maleate as raw material,drug-loaded resin was prepared by cation exchange resin;surface coating method was used to finally prepare sustained-release suspension,using Eudragit RS100 as sustained-release coating material to pre-pare sustained-release microparticles. HPLC was conducted to determine the content of carbinoxamine maleate,release degree of original preparations and self-made suspensions was compared,drug-loading capacity was calculated. RESULTS:The drug amount in preparing drug-loaded resin was 2%,reaction temperature was 25 ℃,and reaction time was 4 h;the drug-loading capacity in surface coating was 35%,amount of coating material was 10%,and reaction temperature was 40 ℃. The drug-loading capacities of sustained particles before and after coating were 35.23%,32.72%,respectively;the yield was 96.82%. The carbinoxamine ma-leate in prepared sustained-release suspension accounted for 98.76% of the labeled amount;release degree in 10 h reached about 80%,f2 was 65.73. CONCLUSIONS:Carbinoxamine maleate sustained-release suspension is prepared successfully,and its release is similar to the original preparation.

Objective To ensure the medical security of the astronauts,new targeted strategies were adopted after summarizing the experience in Chinese astronauts rescue and medical aid at the main landing site,the specialty and characteristics of landing were analysied.Methods Search the publications about astronaut medical aid domestic and abroad,summarize the rescue and medical aid experiences from Shenzhou 5 to Shenzhou 10.In consideration of prolonged on-orbit time,the cold weather conditions at the landing zone of Shenzhou 11,new targeted strategies were presented.Results On the basis of the original helicopter emergency platform and first aid equipment,the emergency aid procedures were optimized,personal warm clothing,a heat preservation box,insulation blanket,self-heating pads and intraosseous rapid infusion system were used to ensure the medical security of astronauts in cold weather at the main landing site.Conclusions With the procedures optimized and the targeted strategies performed,the astronauts' s rescue and medical aid project was fully meet the cold and complex conditions at main landing site.

Objective To summarize the medical security experience in first-aid and resuscitation for astronauts at the exit of capsule after the spacecraft returns to the main landing site in the process of human spaceflight in China,and thus to provide a powerful security measures for Chinese aerospace medicine.Methods The medical support experiences were summarized in human spaceflight from "Shenzhou V" to "Shenzhou X",relevant reports on emergency rescue and resuscitation were consulted in in-orbit process and after emergency return and landing for domestic and foreign astronauts,astronauts' physiological changes in cardiopulmonary resuscitation were analyzed during emergency return,and then,corresponding strategies were proposed and tested in practice (actual combat) by combining with the flight characteristics of the spacecraft "Shenzhou XI".Results On the basis of the original emergency treatment,the countermeasures for the cardiopulmonary resuscitation were proposed after the spacecraft returned to the main landing site in human spaceflight,the emergency equipment was adjusted,the emergency procedures were optimized,and anti-fog glidescopes were added,laryngeal masks were introduced to perform supraglottic ventilation as the quickest and most effective airway opening measure on site.In addition,ultrasound examination was applied in practice as an important treatment and assessment method for basic life support and advanced life support.All these could ensure the rescuing ability on cardiopulmonary resuscitation during their stay in space for the medium-term and after their return to the main landing site.Conclusions During the return of the astronauts of the spacecraft "Shenzhou XI" to the main landing site,the first aid and support program had been improved specifically and the process had been optimized to ensure the successful completion of medical security mission of China's human spaceflight.

Objective:Summarize the experience of the medical rescue team at the main landing site of China's manned space mission, analyze the new characteristics of the Shenzhou 12 space station mission, and take corresponding countermeasures and measures to ensure the strong medical rescue guarantee for astronauts.Methods:Search the publications about astronaut medical aid domestic and abroad, summarize the rescue and medical aid experiences from Shenzhou 5 to Shenzhou 11. In consideration of prolonged on-orbit time, Location adjustment of the landing site and the new characteristics of the complex terrain, new targeted strategies were presented.Results:The astronauts flew in orbit for 90 days, and the main landing site and launch site are in the same area. The medical security includes three parts: launch section, running section and return section. Desert rescue model were added. Ten injuries were simulated and each injury first-aid procedure was standardized.Conclusion:After targeted improvement and optimization, the Shenzhou 12 astronauts medical rescue support program ensures the safety of the whole process, all-weather and all-terrain emergency and rear delivery of the astronauts in the new mission environment and complex terrain.

Objective:To investigate the disease incidence of medical rescue teammates during medical security missions in the dry and hot areas of the Gobi Desert, and to explore its related influencing factors and solutions, so as to provide references for the establishment of a health maintenance system for medical rescue teammates in the Gobi Desert in summer.Methods:Fourteen medical rescue teammates during the medical support mission of the Shenzhou-12 spacecraft from May 2021 to June 2021 were selected as the research objects. A questionnaire survey was conducted and the data were analyzed.Results:During the mission, each teammate had suffered one or more kinds of diseases, mainly manifested in upper respiratory tract infection, dermatosis, systemic muscle soreness, diseases of ophthalmology and otorhinolaryngology, digestive system diseases and sleep disorders, with incidences of 20.3%, 20.3%, 18.5%, 18.5%, 12.9%, and 9.2%, respectively. Training or accidental injuries were mainly manifested as hand trauma, foot friction blisters, recurrence of joint synovitis, joint soft tissue injury, and accidental head injury, with incidences of 31.2%, 25%, 75%, 18.7%, and 6.2%, respectively. The recurrence rate was high in patients who previously suffered synovitis. There was a high possibility of secondary injury in patients who were suffered joint soft tissue trauma before.Conclusions:The incidence of certain diseases is high during the medical rescue support mission in the Gobi Desert. During the mission, the teammates should pay good attention to self-protection at all times, carry out targeted prevention and scientific training, and avoid non-combat attrition.

Objective:To discuss the medical support strategy by summarizing the experience of medical support in Dongfeng landing site.Methods:According to the current situation of medical support at Dongfeng landing site and the practice and experience of previous medical support, a retrospective summary study was conducted.Results:The main methods were summarized: (1) formulate a feasible plan; (2) strictly screen skilled personnel; (3) provide reasonable medicinal materials and equipments; (4) complete the modification of the rescue carrier; (5) attach importance to the training of first aid techniques; (6) strengthen political and ideological education; (7) carry out physical fitness training; (8) seriously participate in actual combat training. Three points of experience were put forward: (1) the importance of thinking and action is the premise of completing the task; (2) the cooperation between training and actual combat is the basis for completing the task; (3) equal emphasis on education and management is the bottom line for completing the task.Conclusions:The medical support experience of the Dongfeng landing site is summarized to provide support and experience for the long-term in-orbit operation of China's space station and on-site medical rescue after the landing of the manned spacecraft.

To analyze how the handover were effected by the conditions of manned spaceflight medical support mission through the practice of medical equipment and drugs in Shenzhou-12 and Shenzhou-13 manned spaceflight medical rescue support missions, this article discussed the preparation, organization and implementation in the handover of medical equipment and drugs in the changing of medical rescue teams, summarized the notices in the work of handover, and provided experience for the smooth handover of different manned spaceflight medical rescue teams in the future.

Objective:To review and summarize the main problems that have occurred in the history of manned spaceflight worldwide and the experience of the medical rescue support for astronauts at the main landing site since the first manned spaceflight mission of the Shenzhou-5 in China in 2003, focus on the technical status and return characteristics during the construction of the space station since the Shenzhou-12, and formulate a targeted injury treatment plan to ensure the safety of astronauts.Methods:This article summarized the lessons of accidental injuries of astronauts in foreign aerospace history, especially in the space station stage, combined with the experience of medical support of astronauts in manned spaceflight in China, and put forward a series of organizations, plans and treatments according to the mission characteristics of long-term orbits and adjustments of the main landing sites of space station mission spacecraft.Results:On the basis of the original pre-cabin emergency and helicopter ICU comprehensive rescue platform, the emergency procedures were further optimized, and the treatment plans under different complex terrains and the principles of rapid treatment and evacuation of astronauts were formulated.Conclusions:The effective treatment of astronauts returning from the space station in various situations could be ensured by the comprehensive rescue plan for the medical rescue of the space station mission and the construction and organization of the helicopter rescue platform.

Objective:This study aims to analyze the characteristics and basic principles of emergency surgery risks and anesthesia care of medical support at the landing site for China’s taikonauts of the Shenzhou-12, and to summarize China’s experience in medical support at the landing site for manned spaceflight, and ensure supports in special environments such as an emergency return of manned spaceflight.Methods:This study was carried out through literature research on relevant reports on the emergency surgery risks and aids of domestic and foreign astronauts at the landing sites, and summaries of the experience in medical support for taikonauts of spacecrafts from Shenzhou-5 to Shenzhou-11 at the landing sites. At the same time, according to the characteristics of Shenzhou-12 such as the long on-orbit time, the adjustment in the landing area, the optimization of the mission mode, and new search and rescue power, a series of organization, pre-arranged planning, equipment allocation, and effective anesthesia treatment plan were proposed and inspected in practice.Results:Based on the original anesthesia care plan of medical support, the first-aid carrier was adjusted and modified, the first-aid procedure was optimized, a new generation of supraglottic airway opening tool, video laryngoscope, portable ultrasound, and other devices were added, and the anesthesia care plan at the landing site for manned spaceflight was formulated to provide strong support for the medical care of taikonauts that had stayed in the outer space for a long time.Conclusions:Upon the targeted improvement and process optimization, the anesthesia care plan of medical support for taikonauts of Shenzhen-12 in the landing area fully meets the anesthesia requirement of medical support in special environments such as the emergency return of the taikonauts that have stayed in the outer space for a long time under the new orbital altitude.

Energy metabolism is fundamental for life.It encompasses the utilization of carbohydrates,lipids,and proteins for internal processes,while aberrant energy metabolism is implicated in many diseases.In the present study,using three-dimensional(3D)printing from polycarbonate via fused deposition modeling,we propose a multi-nuclear radiofrequency(RF)coil design with integrated 1H birdcage and interchangeable X-nuclei(2H,13C,23Na,and 31P)single-loop coils for magnetic resonance imaging(MRI)/magnetic resonance spectroscopy(MRS).The single-loop coil for each nucleus attaches to an arc bracket that slides unrestrictedly along the birdcage coil inner surface,enabling convenient switching among various nuclei and animal handling.Compared to a commercial 1H birdcage coil,the proposed 1H birdcage coil exhibited superior signal-excitation homogeneity and imaging signal-to-noise ratio(SNR).For X-nuclei study,prominent peaks in spectroscopy for phantom solutions showed excellent SNR,and the static and dynamic peaks of in vivo spectroscopy validated the efficacy of the coil design in structural imaging and energy metabolism detection simultaneously.