Pulsating vacuum steam sterilization cabinet daily sterilization before or after maintenance should be carried out B-D test to detect the sterilization cabinet air exclusion effect, such as failure, indicating that the cold air exclusion is not complete or cabinet leakage phenomenon, can not be corrected with the extension of the start time.
B-D test failure reasons:
1) sterilization cabinet itself, the factors of the vacuum pump kinetic energy decline, the use of sterilizers for a long time, sterilization cabinet aging, resulting in the cabinet room does not reach the degree of vacuum should be. Self-control system failure, pumping negative pressure to shorten the time, is not conducive to the release of cold air and exclusion. Cabinet sealing performance decline, can not maintain the required negative pressure, resulting in the exclusion of cold air at the same time there is still cold air infiltration, such as the door seal aging, self-locking leather bowl with cracks.
②Technical operational factors, the test package specification size is not appropriate, the cloth does not meet the requirements, wrapped too tightly, affecting the steam penetration. Temperature rise too fast, & lt; 5min that is up to 134 ℃; steam source total pressure is low & lt; 0.3MPa/cm2, into the slow, affecting the steam penetration, the pattern is not the same depth, the cabinet indoor air starting temperature is low gravity effect is obvious, the cold air is not easy to exhaust.
Countermeasures: for the sterilization cabinet itself factors, should be immediately repaired to ensure that the equipment work efficiency is intact, the instrumentation parameters are running normally, improve the maintenance of equipment and maintenance system, and regular maintenance and monitoring, and to strengthen the staff's technical specifications for the operation of the management. B-D test kit according to the size of the specifications to produce packaging, cloth selection of cotton cloth, should be first de-pulpified and washed, air drying and then use, but do not hot ironing. Because of excessive drying will affect the test results, repeated use of the test kit cloth must be washed before use, the cloth package is too wet can also affect the results of the cloth towel folded loosely, such as too tight or the cloth package is too small in size is not easy to capture the residual cold air.B-D test paper should be patterned upward and flat into the geometric center of the test package, because the geometric center of the location of the sterilization cabinet after the start of the slowest warming, the cold air is most likely to stay in the place. Control the appropriate heating rate, so that the sterilization temperature gradually increased. 5min-8min to 134 ℃, for 3.5min-4min, before starting the test package in the sterilizer preheating, can reduce the emergence of cold air mass in the test package.