Abstract: Objective In this paper, the causes and corresponding solutions of boot pressure self-checking failure of Baxter Prisma Flex continuous blood purification machine are explored through pressure test, seal test and reset of pressure scabbard film, in order to provide a practical and feasible maintenance method and route for peers treating continuous blood purification machine pressure failure. Methods The causes of the failure are examined and solved through equipment cabin programs for pressure test, seal test and reset of scabbard film to analyze the error code of self-check alarm, fault component prompt and corresponding sensor output value according to the principle of pressure test. Results This method follows the principle of stress test combined with the pressure self-check alarm prompt, which can quickly find out the fault location and the exact solution and is different from the method that needs professional pressure testing instrument and complex test procedures recommended in manufacturer maintenance manual. Conclusion Best knowledge about the Prisma Flex pressure testing principle is fundamental to analyze and solve the problems. The thought that systematically determines and excludes the problems using the pressure self-checking prompt is worthwhile to be recommended, and has a practical significance.

Key words: Prisma Flex maintenance, Pressure test, Sealing test, Reset of pressure sheath membranes, Pressure self-inspection