Electronic autoclave timing circuit for kidney dialysis apparatus

Abstract From the Canadian patent

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° 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 …