| 摘要 |
Disclosed herein is an improved electronic control system for the autoclaving sequence of a kidney dialysis machine, during which water is circulated at high temperature and pressure to clean and sterilize the machine. The circuit ensures that the machine will be autoclaved for a minimum period of time, such as 20 minutes, measured only while the temperature is above a minimum, such as 120 DEG centigrade. The circuit will remember the time of autoclaving previous to a power interruption, and will continue to time the autoclaving function only when the temperature has again exceeded the set minimum. Once an autoclaving sequence is initiated, the circuit prevents normal use of the machine until the sequence is completed. During the autoclave timing sequence, the kidney by-pass solenoid is energized and de-energized on a 50% duty cycle to make sure all flow paths in the machine are cleaned and sterilized. |
