System and method for recycling sterilant gas

• US 8,268,238 B2
• Filed: 08/23/2010
• Issued: 09/18/2012
• Est. Priority Date: 09/29/2006
• Status: Active Grant

• Current Assignee: Kpr U.S., LLC (Cardinal Health, Inc.)
• Original Assignee: Tyco Healthcare Group LP (Medtronic Plc)
• Inventors: Bondar, Douglas E., Bongiovi, Michael L.
• Primary Examiner(s): Alexander, Lyle
• Application Number:
  US12/861,040
• Publication Number:
  US 20100313962A1
• Time in Patent Office: 757 Days
• Field of Search: 422/3, 422/28, 422/31, 422/105, 422/110, 422/292, 422/295, 436/1, 436/55
• US Class Current: 422/3
• CPC Class Codes: A61L 2/206 Ethylene oxide
• CPC Class Codes: Y10T 137/0324 With control of flow by a condition or characteristic of a fluid
• CPC Class Codes: Y10T 436/12 Condition responsive control

Abstract

A system for recovery of a sterilant gas mixture from a sterilizer chamber is disclosed. The system includes a gas recovery tank, a sterilizer chamber in gaseous communication with the gas recovery tank and a gas recovery assembly coupled to the gas recovery tank and the sterilizer chamber. The gas recovery assembly is configured to transfer a sterilant gas mixture including at least one sterilant gas between the sterilizer chamber and the gas recovery tank. The system further includes an analyzer assembly coupled to the sterilizer chamber, the analyzer assembly including at least one sterilant gas sensor configured to detect density of the sterilant gas and a control module coupled to the analyzer assembly and to the gas recovery assembly. The control module includes at least one control module configured to determine at least one of a transfer pressure and flammability of the sterilant gas mixture as a function of the density of the sterilant gas.

Claims

1. A system for recovery of a sterilant gas mixture from a sterilizer chamber, the system comprising:

a gas recovery tank;

a sterilizer chamber in gaseous communication with the gas recovery tank;

a gas recovery assembly coupled to the gas recovery tank and the sterilizer chamber, wherein the gas recovery assembly is configured to transfer a sterilant gas mixture including at least one sterilant gas between the sterilizer chamber and the gas recovery tank;

an analyzer assembly coupled to the sterilizer chamber, the analyzer assembly including at least one sterilant gas sensor configured to detect density of the sterilant gas; and

a control module coupled to the analyzer assembly and to the gas recovery assembly, the control module configured to determine a transfer pressure for achieving a desired concentration of the sterilant gas and flammability of the sterilant gas mixture as a function of the density of the sterilant gas.

2. A system according to claim 1, wherein the analyzer assembly further includes:

a pressure sensor;

a temperature sensor; and

at least one relative humidity sensor.

3. A system according to claim 1, wherein the at least one control module configured to determine concentration of the at least one sterilant gas.

4. A system according to claim 3, wherein the at least one control module is configured to determine at least one of the transfer pressure and flammability of the sterilant gas mixture as a function of the concentration of the at least one sterilant gas.

5. A system according to claim 1, further comprising a gas circulation assembly in gaseous communication with the sterilizer chamber, the gas circulation assembly comprising at least one circulation fan configured to circulate the sterilant gas mixture through the sterilizer chamber.

6. A system according to claim 1, wherein the gas recovery assembly further comprises first and second vacuum pumps coupled in series.

7. A method for recovery of a sterilant gas mixture from a sterilizer chamber, the method comprising:

detecting a density of at least one sterilant gas present in a sterilant gas mixture;

detecting concentration of the at least one sterilant gas present in the sterilant gas mixture as a function of the density thereof;

calculating a transfer pressure for achieving a desired concentration of the sterilant gas and flammability of the sterilant gas mixture as a function of the concentration of the at least one sterilant gas; and

transferring the sterilant gas mixture from a gas recovery tank to a sterilizer chamber via a gas recovery assembly.

8. A method according to claim 7, further comprising detecting temperature and pressure within the sterilizer chamber.

9. A method according to claim 7, further comprising:

calculating flammability of the sterilant gas mixture as a function of the concentration of the at least one sterilant gas.

10. A method according to claim 7, further comprising:

circulating the sterilant gas mixture through the sterilizer chamber.

11. A method according to claim 7, further comprising:

calculating the transfer pressure of the sterilant gas mixture as a function of a target sterilant gas concentration.

12. A method for recovery of a sterilant gas mixture from a sterilizer chamber, the method comprising:

detecting adensity of at least one sterilant gas present in a sterilant gas mixture;

detecting concentration of the at least one sterilant gas present in the sterilant gas mixture as a function of the density thereof;

calculating a transfer pressure for achieving a desired concentration of the sterilant gas and flammability of the sterilant gas mixture as a function of the concentration of the at least one sterilant gas and a target sterilant gas concentration; and

transferring the sterilant gas mixture from a gas recovery tank to a sterilizer chamber via a gas recovery assembly.

13. A method according to claim 12, further comprising:

detecting atmospheric conditions within the sterilizer chamber.

14. A method according to claim 12, further comprising:

circulating the sterilant gas mixture through the sterilizer chamber.