The Man-machine Interface Function Development Of Plasma Separating Blood Dialysis Machine

Blood purification is a major means of kidney disease treatment and sustain life,With the increasing of nephrosis patient numbers all over the world, as the major treatment, demanding of blood purification equipment is booming. And the application of blood purification technology is also expanded to areas like liver diseases, drug poisoning, rheumatism, pesticide intoxication and septicaemia.In our country’s victims of advanced kidney disease, healing rate is less than one tenth of those in developed countries, and 80% patients couldn’t get dialytic treatments. Monopoly of european and american countries in our country’s blood purification market has been a problem as well, our market share is no more than 10%. Nowadays, our country has been focused on construction of village medical treatment and improvement of medical care assurance, hence market need in blood purification is becoming more urgent. Therefore, it is a pressing matter of the moment to develop our own blood purification equipment which must be safe and reliable.At present, human-computer interaction systems of many dialysis machines are complicated, unsensitive electric resistive panels are still used in some machines. Nurses are often mislead by the buttons in operating panel which are too many. Complex and frequently switching interfaces seriously impact users’ reaction ability and accuracy. There are also too many setup options in machines’ self-inspection, pre-filling and treatment progress, especially some unnecessary setups and in some one-time operation. If optimized, user experience will be improved greatly. Research indicates, separated blood plasma works better that whole blood in clearance and therapeutic efficacy of blood purification. Accordingly, a separated plasma hemodialysis machine was designed in my study, which has realised human-computer interaction, database design and serial communication.Firstly, our sytem’s development platform and software structure were determined. Linux operating system was chosen and QT was the developmental instrument.Software structure was then designed for human-computer interaction and its function.In this paper, human-computer interaction project was introduced, including starting up welcoming, self-inspection, mode selection, treatment, real-time information, setup interfaces’ design, operation method, and pre-filling and blood recycle’s design and realisation.Secondly, combination of inserting database and patient information interface described the progress of database establishment,including user login, password changing, patient information and patient treatment information interfaces.Users can login, change passwords, check, inquest, add, delete and modify patient information, and check and review patient treatment information.SQLite database was elected as the inserting database, and three sheets were designed, namely user information, patient information and patient treatment information sheets. Contents of these three sheets and the connections among them were shown by E-R diagrammatic figures.The method of database realisation was also presented.Eventually, communication of host computer and slave computer came true, using serial communication, data can be sent out and received. Protocol MODBUS was made for host computer and slave computer communication and CRC verification was achieved.In this paper, method for developing serial communication in QT environment was described in detail along with CRC verification’s calculation and implement method.