Method, device and composition for the sustained release of an antimicrobial gas

• US 6,620,380 B2
• Filed: 09/14/2001
• Issued: 09/16/2003
• Est. Priority Date: 09/14/2001
• Status: Expired due to Fees

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab, Inc.
• Inventors: Kilawee, Patrick H., Thomas, John E.
• Primary Examiner(s): JASTRZAB, KRISANNE MARIE
• Application Number:
  US09/952,396
• Publication Number:
  US 20030133833A1
• Time in Patent Office: 732 Days
• Field of Search: 422/3, 422/28, 422/29, 422/37, 422/105, 422/108, 422/116, 422/305, 206/213.1, 423/477, 252/187.21, 252/187.23
• US Class Current: 422/29
• CPC Class Codes: A61L 2/20 Gaseous substances, e.g. vapours
• CPC Class Codes: A61L 2/202 Ozone
• CPC Class Codes: A61L 2/206 Ethylene oxide
• CPC Class Codes: A61L 2/26 Accessories or devices or components used for biocidal treatment
• CPC Class Codes: A61L 9/015 using gaseous or vaporous substances, e.g. ozone A61L9/20 takes precedence ; evaporation in general B01B1/005
• CPC Class Codes: C01B 11/022 Chlorine dioxide (ClO2)

Abstract

A unitary container housing having a plurality of sealed compartments each containing a dry composition which will gradually release an antimicrobially active gas upon exposure to moist air, and each compartment being separately openable to expose its contents to the environment, and a method of using the same.

Claims

1. A method of generating chlorine dioxide gas comprising:

providing a dry solid composition which reacts in the presence of water or water vapor to produce an antimicrobially active gas, but does not react in the absence of water or water vapor, and

exposing the composition to a moist environment, wherein

the composition is divided into a plurality of separate portions, each contained in a separate sealed compartment of a container housing, and

the sealed compartments are sequentially unsealed to expose the contents thereof to the environment around said container housing in response to a predetermined stimulus event.

2. The method of claim 1 wherein said gas is chlorine dioxide, a halogen, ozone or ethylene oxide.

3. The method of claim 1 wherein said stimulus event is a time increment.

4. The method of claim 1 wherein said stimulus event is a monitor signal indicative of a depleted concentration of gas.

5. The method of claim 1 wherein said sealed compartments are unsealed by an electrical current.

6. A device for delivering an antimicrobially active gas comprising

a unitary container housing having a plurality of sealed compartments each containing a dry composition which will gradually release chlorine dioxide upon exposure to moist air,

a compartment opener operable on said unitary container housing to open a said compartment in sequence in response to an opening signal and

a controller operable to periodically issue a opening signal to the opener.

7.The device of claim 6 wherein said controller issues an opening signal in response to a timing program.

7. The device of claim 6 further comprising a monitor of gas concentration and said controller is configured to issue a said opening signal in response to a depleted concentration of gas indication received from said monitor.

8. The device of claim 6 wherein each of the compartments is sealed by a thermoplastic film cover, and said compartment opener comprises a heating unit adapted to melt said film cover in response to an opening signal.

9. A unitary container housing having a plurality of sealed compartments each containing a dry composition which will gradually release chlorine dioxide upon exposure to moist air, and each compartment being separately openable to expose its contents to the environment.

10. A container housing as in claim 10 wherein each of the compartments is sealed by a thermoplastic film cover.

11. A device for the sustained release of an antimicrobially active gas comprising:

a) a power supply;

b) an electrical switch;

c) a plurality of conductors connected to said electrical switch each of which terminates in an electrode;

d) a controller operatively connected to said power supply and said electrical switch; and

e) a container having a top and a bottom housing a plurality of sealed pockets, each pocket containing a composition which generates an antimicrobially active gas upon exposure to water or water vapor and

wherein each electrode is attached to a pocket;

wherein the controller directs the switch to apply power sequentially to each conductor for a first predetermined time interval with a second predetermined time interval between each application of power for opening said sealed pockets.

12. The device of claim 12 wherein said top is film or a film laminate having at least a first layer and a second layer.

13. The device of claim 12 wherein said electrode increases in temperature upon application of power to said conductor to a temperature sufficient to melt said film or laminate.

14. The device of claim 13 wherein said electrode is attached to said sealed pocket between said first and said second layer of said film laminate.

15. The device of claim 12 wherein said gas is chlorine dioxide, a halogen, ozone or ethylene oxide.

16. The device of claim 12 wherein said composition in said each pocket comprises a metal chlorite and an acidic component.

17. The device of claim 12 wherein said power supply is a 9-volt battery or a 24VAC power source.

18. The device of claim 12 wherein said conductor is a wire of between about 12-gauge and about 30-gauge.

19. A method for the sustained release of an antimicrobially active gas comprising the steps of:

a) providing a container having a plurality of sealed pockets each of which contains a composition which generates an antimicrobially active gas upon exposure to water or water vapor, a plurality of conductors terminated in an electrode and each electrode attached to at least one of said plurality of said sealed pockets, an electrical switch connected to said conductors which is in turn connected to a power source; and

b) sequentially supplying power to each of said conductors for a first predetermined time interval with a second predetermined time interval between each application of power for opening said sealed pockets.