Decontamination unit with collapsible decontamination enclosure and decontamination process

• US 8,216,523 B2
• Filed: 02/20/2008
• Issued: 07/10/2012
• Est. Priority Date: 03/06/2007
• Status: Active Grant

• Current Assignee: Steris Corporation
• Original Assignee: Steris Corporation
• Inventors: Meilander, Timothy W., McVey, Jain F., Pasmore, Mark E., Kozak, Janusz K., Centanni, Michael A., Wiget, Paul A
• Primary Examiner(s): Griffin, Walter D
• Assistant Examiner(s): Vandeusen, Christopher
• Application Number:
  US12/033,897
• Publication Number:
  US 20080279720A1
• Time in Patent Office: 1,602 Days
• Field of Search: 422/30, 422/294
• US Class Current: 422/294
• CPC Class Codes: A61L 2/208 Hydrogen peroxide
• CPC Class Codes: A61L 2202/122 Chambers for sterilisation
• CPC Class Codes: A61L 2202/26 Textiles, e.g. towels, beds, cloths

Abstract

The disclosed invention relates to a decontamination unit that employs a collapsible decontamination enclosure and a decontaminant air stream generator that uses catalytic discharge. The invention also relates to a decontamination process using the decontamination unit. The decontamination unit may be carried by an individual person, for example, in the form of a backpack. The decontamination unit may be ruggedized for use in hostile environments such as those that may be anticipated for military applications.

Claims

1. A decontamination unit, comprising:

a collapsible enclosure equipped with a gas inlet and a gas outlet, the collapsible enclosure when erected being suitable for providing a decontamination enclosure for containing articles to be decontaminated, the collapsible enclosure when collapsed being suitable for being transported;

a decontaminant air stream generator which comprises a liquid hydrogen peroxide container, a catalyst section containing a catalyst therein, and a decontaminant air stream mixing section, the liquid hydrogen peroxide container including a liquid hydrogen peroxide separation wall which separates the liquid hydrogen peroxide container from the catalyst section, the liquid hydrogen peroxide separation wall comprising one or more passageways for permitting liquid hydrogen peroxide to flow from the liquid hydrogen peroxide container to the catalyst section where the liquid hydrogen peroxide contacts the catalyst within the catalyst section or being made of a frangible material which when broken permits liquid hydrogen peroxide to flow from the liquid hydrogen peroxide container to the catalyst section where the liquid hydrogen peroxide contacts the catalyst within the catalyst section, the generator being adapted for catalytically converting part of the liquid hydrogen peroxide to water and oxygen in an exothermic reaction and for vaporizing part of the liquid hydrogen peroxide to form vaporous hydrogen peroxide, the generator including an inlet adapted for permitting air to flow into the decontaminant air stream mixing section in contact with the vaporous hydrogen peroxide and an outlet adapted for permitting a decontaminant air stream comprising the air and vaporous hydrogen peroxide to flow out of the decontaminant air stream mixing section;

a blower adapted to be connected to the generator outlet and the collapsible enclosure gas inlet, the blower being suitable for forcing the flow of the decontaminant air stream from the generator into the collapsible enclosure; and

an exhaust hose adapted to be attached to the collapsible enclosure gas outlet, the exhaust hose comprising an interior wall impregnated with a catalyst for converting hydrogen peroxide to water and oxygen, and/or the exhaust hose comprising a biological and/or chemical hazard filter to separate hazardous chemical and/or biological materials from exhaust gas flowing in the exhaust hose.

2. The decontamination unit of claim 1 wherein the collapsible enclosure comprises a floor and side walls made of a fabric or film.

3. The decontamination unit of claim 1 wherein the collapsible enclosure includes an interior support frame.

4. The decontamination unit of claim 1 wherein the collapsible enclosure is erected to form the decontamination enclosure, the decontamination enclosure having an internal volume in the range from about 0.5 to about 30 cubic meters.

5. The decontamination unit of claim 1 wherein the collapsible enclosure is ruggedized.

6. The decontamination unit of claim 1 wherein the catalyst section includes a catalyst separation wall which separates the catalyst section from the decontaminant air stream mixing section, the catalyst separation wall including one or more openings adapted to permit the flow of reaction products from the catalyst section into the decontaminant air stream mixing section and a pressure release valve or a pressure release membrane positioned in the one or more openings.

7. The decontamination unit of claim 1 wherein the blower is adapted to be connected to the generator outlet by a first conduit and to the collapsible enclosure gas inlet by a second conduit.

8. The decontamination unit of claim 1 wherein the blower is powered by a solar cell or a battery.

9. The decontamination unit of claim 7 wherein the decontamination unit further comprises a gaseous ammonia container, the gaseous ammonia container being adapted to be connected to the first conduit or the second conduit to permit the gaseous ammonia to flow into the first or second conduit in contact with the decontaminant air stream.

10. The decontamination unit of claim 1 wherein the generator is ruggedized.

11. The decontamination unit of claim 9 wherein the collapsible enclosure, generator, blower, exhaust hose and/or gaseous ammonia container are ruggedized.

12. A process for operating the decontamination unit of claim 1, comprising;

erecting the collapsible enclosure to form a decontamination enclosure suitable for receiving articles to be decontaminated;

connecting the blower to the gas inlet of the enclosure;

connecting the blower to the generator;

connecting the exhaust hose to the gas outlet of the enclosure;

placing one or more contaminated articles in the enclosure;

generating a decontaminant air stream comprising air and vaporous hydrogen peroxide in the generator;

flowing the decontaminant air stream into the enclosure;

contacting the contaminated articles in the enclosure with the decontaminant air stream to decontaminate the contaminated articles;

flowing gas from the enclosure through the exhaust hose;

opening the enclosure; and

removing decontaminated articles from the enclosure.

13. The process of claim 12 wherein the decontaminant air stream further comprises ammonia.

14. The process of claim 12 wherein the contaminated articles comprise one or more of military weapons, clothing, body armor, radio headsets, night vision goggles, computers, test equipment, optical devices, electronic devices and/or communications equipment.

15. The process of claim 12 wherein the contaminated articles are contaminated with one or more chemical, biological, radiological and/or nuclear warfare agents.

16. The process of claim 12 wherein the contaminated articles are contaminated with one or more bacterial spores, vegetative bacteria, viruses, molds and/or fungi.

17. The process of claim 12 wherein the contaminated articles are contaminated with one or more pathogenic chemical agents.

18. The process of claim 12 wherein the step of contacting the contaminated articles with the decontaminant air stream comprises a dry process characterized by the absence of condensate formation on the surface of the contaminated articles being decontaminated.

19. The process of claim 12 wherein the step of contacting the contaminated articles with the decontaminant air stream comprises a wet process characterized by the formation of condensate on the surface of the contaminated articles being decontaminated.

20. The process of claim 19 wherein the condensate comprises hydrogen peroxide.

21. The decontamination unit of claim 1 wherein the catalyst section comprises a catalyst insert.