Method and system for simultaneous microwave sterilization of multiple medical instruments

• US 5,858,303 A
• Filed: 07/07/1997
• Issued: 01/12/1999
• Est. Priority Date: 06/07/1995
• Status: Expired due to Fees

• Current Assignee: Quiclave LLC
• Original Assignee: Quiclave LLC
• Inventors: Schiffmann, Robert Frank, Held, Jeffery Scott
• Primary Examiner(s): Thornton, Krisanne
• Assistant Examiner(s): Moazzam, Fariborz
• Application Number:
  US08/888,656
• Time in Patent Office: 554 Days
• Field of Search: 422/21, 422/105, 422/109, 422/119, 219/710, 219/759
• US Class Current: 422/21
• CPC Class Codes: A61L 2/12 Microwaves
• CPC Class Codes: A61L 2/26 Accessories or devices or components used for biocidal treatment
• CPC Class Codes: H05B 6/6408 Supports or covers specially adapted for use in microwave heating apparatus
• CPC Class Codes: H05B 6/6494 for cooking
• CPC Class Codes: H05B 6/806 for laboratory use

Abstract

A method of simultaneously sterilizing a first object and a second object that includes providing a first container with a first exterior surface, the first exterior surface comprises a first microwave interactive layer and defines a first interior space having a first initial temperature. The first object is placed within the first interior space of the first container. The method includes the step of providing a second container with a second exterior surface, the second exterior surface comprises a second microwave interactive layer and defines a second interior space having a second initial temperature. A second object is placed within the second interior space of the second container. The first and second microwave interactive layers are exposed to a first amount of microwaves so that the first microwave layer produces heat which raises the temperature within the first interior space to a predetermined sterilization temperature. The temperature is maintained within the first interior space at the predetermined temperature for an amount of time sufficient to sterilize the first and second objects.

Claims

1. A method of simultaneously sterilizing a first object and a second object, said method comprising the steps of:

providing a first container with a first exterior surface, said first exterior surface comprises a first microwave interactive layer and defines a first interior space having a first initial temperature;

placing said first object within said first interior space of said first container;

providing a second container with a second exterior surface, said second exterior surface comprises a second microwave interactive layer and defines a second interior space having a second initial temperature;

placing said second object within said second interior space of said second container;

exposing said first and second microwave interactive layers to a first amount of microwaves so that the first microwave layer produces heat which raises the temperature within said first interior space to a predetermined sterilization temperature; and

maintaining the temperature within said first interior space at said predetermined temperature for an amount of time sufficient to sterilize said first and second objects.

2. The method of claim 1, wherein said first object is metallic.

3. The method of claim 2, wherein said microwave interactive layer allows microwaves to be transmitted therethrough and interact with said metal object.

4. The method of claim 3, wherein said metal object does not arc, spark or otherwise exhibit corona discharge during said exposing step.

5. The method of claim 4, wherein said metal object does not arc, spark or otherwise exhibit corona discharge during said maintaining step.

6. The method of claim 3, wherein said metal object does not arc, spark or otherwise exhibit corona discharge during said maintaining step.

7. The method of claim 2, wherein said first object is a dental instrument.

8. The method of claim 3, wherein said first object is a medical instrument.

9. The method of claim 1, wherein said predetermined sterilization temperature ranges from about 175°

C. to about 200°

C.

10. The method of claim 1, wherein said exposing step is performed during a period of time ranging from about 30 seconds to about 60 seconds.

11. The method of claim 1, wherein said amount of time sufficient to sterilize said first and second objects ranges from about 5 to 7 minutes.

12. The method of claim 1, said exposing step is performed by emitting said first amount of microwaves from a microwave source.

13. The method of claim 12, said maintaining step comprises reducing the power of said microwave source so as to maintain said predetermined temperature.

14. The method of claim 13, comprising the step of sensing the temperature of the surface of said first container during said exposing step;

and

wherein said power is reduced in response to the temperature sensed at the surface of said first container.

15. The method of claim 13, said maintaining step comprises pulsing the power of said microwave source so as to maintain said predetermined temperature.

16. The method of claim 15, wherein parameters of said pulsed power are controlled in response to the temperature sensed at the surface of said container.

17. The method of claim 1, comprising the step of sensing the temperature of the surface of said first container during said exposing step;

and

wherein said maintaining step is performed in response to the temperature sensed at the surface of said first container.

18. The method of claim 1, wherein the temperature within said first interior space reaches the predetermined temperature before the temperature within the second interior space does.

19. The method of claim 1, comprising the step of sensing the temperature of said second interior during said exposing step;

and

wherein said maintaining step is performed in response to the temperature sensed within said second interior.

20. The method of claim 19, comprising the step of indicating when the predetermined temperature is reached by having a temperature sensitive material changes color once the predetermined temperature is reached.

21. The method of claim 19, wherein said second container has a window;

and

said sensing step comprises sensing said color change through said window.

22. The method of claim 1, wherein said dummy load has heat conductive and microwave properties similar to those of said object.

23. The method of claim 22, comprising the step of reflecting microwaves away from said dummy load.

24. The method of claim 23, wherein said second container has a window;

and

said sensing step comprises sensing infrared radiation emitted through said window.

25. The method of claim 22, comprising the step of indicating when the predetermined temperature is reached by having a temperature sensitive material changes color once the predetermined temperature is reached.

26. A method of sterilizing an object, said method comprising the steps of:

providing a first container with a first exterior surface, said first exterior surface comprises a first microwave interactive layer and defines a first interior space having a first initial temperature;

placing said object within said first interior space of said first container;

providing a second container with a second exterior surface, said second exterior surface comprises a second microwave interactive layer and defines a second interior space having a second initial temperature;

placing a dummy load within said second interior space of said second container;

exposing said first and second microwave interactive layers to a first amount of microwaves so that the second microwave layer produces heat which raises the temperature within said second interior space to a predetermined sterilization temperature; and

maintaining the temperature within said second interior space at said predetermined temperature for an amount of time sufficient to sterilize said object.

27. The method of claim 26, wherein said object is metallic.

28. The method of claim 27, wherein said object is a dental instrument.

29. The method of claim 28, wherein said object is a medical instrument.

30. The method of claim 26, wherein said predetermined sterilization temperature ranges from about 175°

C. to about 200°

C.

31. The method of claim 26, wherein said exposing step is performed during a period of time ranging from about 30 seconds to about 60 seconds.

32. The method of claim 26, wherein said amount of time sufficient to sterilize said object ranges from about 5 to 7 minutes.