Introduction. Support systems currently used in modern cardiac surgery to provide partial or complete, permanent or temporary replacement of cardiac function are frequently characterized by large dimensions, thus requiring major surgical interventions. Low invasiveness can be ensured by reducing the size of the implanted part of such systems, allowing these devices to be inserted through the femoral artery.Aim. Development of a minimally invasive micropump system to support blood circulation.Materials and methods. Based on the analysis of implementation of micropump circulatory support systems (MCSS), the configuration, operational principles and main components of such a system were determined. When designing a micropump, as a unit defining the weight and size parameters of the entire system, numerical and experimental methods were used to optimize its flow path based on the condition of minimizing blood injury and thrombus formation. The lubrication and cooling system was developed by solving the thermodynamic problem of heat removal. The electronic control unit was developed on the basis of accumulated experience in the design and operation of control units for circulatory support systems.Results. A micropump with a diameter of 6.5 mm and a length of 43 mm with the required hydro- and hemodynamic parameters was designed. The device ensures minimal trauma and thrombus formation. The main MCSS parameters, as well as its main components (electric drives, lubrication and cooling systems), were defined. The configuration and operational principles of the electronic control unit (ECU), consisting in a microprocessor-based control system with feedback, were developed. The ECU built-in software manages the rotational speed of the electric drives of the micropump and coolant supply pump in the required range. In addition, the software is used to measure, display and register the MCSS operational parameters, as well as to monitor their operation in the required ranges and to exchange data between the ECU and the PC.Conclusion. All the necessary documentation for the MCSS nodes and components was prepared. These nodes and components ensure the hydro- and hemodynamic parameters required for the use of the developed minimally invasive micropump system. Future work will address the stages of MCSS assembly and debugging.
The priority task of the development of unmanned aviation is to create conditions for flight safety, which is impossible without the use of unmanned aerial vehicle (UAV) flight control system. One of such systems is the Russian unmanned aircraft system traffic management (RUTM), an important part of which is the flight service support system. Based on the analysis of typical actions of users of RUTM system, the article formulates the requirements for their user interfaces and provides a list of necessary services. The issues of organizing the operation of these services based on the database of aeronautical information (AI) intended for storage, processing and provision of up-to-date information to users of the system are also considered. The size of such a base largely depends on the choice of a system of spatial coordinates, with the help of which objects on the map are associated with real objects on the ground. The analysis of existing coordinate systems showed that for the database under consideration, the best option is to store AI in World Geodetic System (WGS) WGS 84 geographic coordinate system. At the same time, the provision to the end user is carried out after recalculating it into the appropriate projection, depending on the requirements for the nature of the distortions. When displaying AI on 3D map, it is proposed to use a cube or an octahedron as a base polyhedron, and a projection of a sphere onto an octahedron as a projection, which makes it possible to halve the redundancy of the initial AI.
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