Control means including a diagnostic operating mode for a sterilizer

• US 5,270,948 A
• Filed: 02/01/1991
• Issued: 12/14/1993
• Est. Priority Date: 02/01/1991
• Status: Expired due to Fees

• Current Assignee: Barnstead Thermolyne Corporation (Perspecta, Inc.)
• Original Assignee: MDT Incorporated
• Inventors: O'Brien, Michael J., Johnson, Kenneth A., Ellis, Charles E. Jr.
• Primary Examiner(s): Cosimano, Edward R.
• Application Number:
  US07/649,445
• Time in Patent Office: 1,047 Days
• Field of Search: 364/184, 364/186, 364/550, 364/551.01, 422/119
• US Class Current: 702/82
• CPC Class Codes: G05B 19/0428 Safety, monitoring G05B19/0423 takes precedence
• CPC Class Codes: G05B 2219/23454 Execute program in fast mode, real system has no time to respond
• CPC Class Codes: G05B 2219/24057 Set jumper on board to change user mode to diagnostic mode
• CPC Class Codes: G05B 2219/2644 Sterilizer

Abstract

The electronic microprocessor controller of a sterilizer includes a circuit board functionally controlled by software. The software includes a fist user operation mode for normal operation of the sterilizer. A diagnostic operation mode is initiated by insertion of a jumper in the circuit board, and provides for repetitive cycle operation without opening the door, quickly advancing to a cycle phase, without completion of intervening phases, printing of variables not available in the user operation mode, and calibration of the circuitry.

Claims

1. An electronic microprocessor control means for a sterilizer which has a chamber with a closable door, timing means, heating means, evacuation means, sterilant introduction means, temperature control means, vent means, purge means and valved conduit means structured and arranged for evacuating the chamber, introducing the sterilant to said chamber, and processing a load of articles in the chamber by contact with said sterilant for a specified time period at predetermined temperature and pressure conditions, said electronic microprocessor control means having monitoring means for measuring and controlling operating variables and comprising:

circuit board means configured for communicative control of said timing means, heating means, evacuation means, sterilant introduction means, temperature control means, vent means and purge means;

PROM memory storage means for storage and recall of binary signals controlling said circuit board means to operate said sterilizer;

first software means programmed in said PROM memory storage means, said first software means comprising a program for controlling said circuit board means in a user operation mode comprising complete cycles of ordered sequences of phases including a power-on phase, an evacuation phase, a processing/sterilizing phase, a purge phase and a cycle completion phase;

second software means programmed in said PROM memory storage means, said second software means comprising a program for controlling said circuit board means to controllably operate said sterilizer in said user operation mode or in a diagnostic operation mode for initial calibration, determining freedom from defects, and diagnostic analysis of said sterilizer;

first conduit means communicates said first software means with said circuit board means to carry out said user operation mode;

second electric conduit means for selectable communication of said second software means with said circuit board means to carry out either said user operation mode or said diagnostic operation mode; and

removable means to selectively connect said second electric conduit means between said first software means and/or said second software means and said circuit board means, whereby the circuit board means may be operated in either the user operation mode or the diagnostic operation mode.

2. The control means of claim 1, wherein said removable means to selectively connect said second electric conduit means and said circuit board means comprises a manually removable insertable conductive jumper insertable into and removable from a receptacle in said circuit board means for initiating said communication between said second software means and said circuit board means.

3. The control means of claim 1, wherein said diagnostic operation mode includes a selectable submode of:

controllably advancing through said phases to a desired phase without completing intervening phases.

4. The control means of claim 1, wherein said diagnostic operation mode includes a selectable submode of:

performing repetitive sterilization cycles without opening said sterilizer chamber door between cycles.

5. The control means of claim 1, further comprising indicator means for displaying said mode of operation.

6. The control means of claim 1, wherein said second software means includes means for diagnosing said circuit board means, memory storage means, temperature control means, timing means, heating means, evacuation means, sterilant introduction means, vent means and purge means.

7. The control means of claim 6, wherein said diagnostic operation mode includes temperature sensing means and pressure sensing means in said chamber and electrically connected to said circuit board;

and a printing-type recorder electrically connected to said circuit board to print out temperatures and pressures detected by said temperature sensing means and said pressure sensing means.