Decontamination device and method using ultrasonic cavitation

• US 10,398,795 B2
• Filed: 12/29/2017
• Issued: 09/03/2019
• Est. Priority Date: 12/29/2017
• Status: Active Grant

• Current Assignee: TOMI Environmental Solutions, Inc.
• Original Assignee: TOMI Environmental Solutions, Inc.
• Inventors: Shane, Halden Stuart, Cato, Johnny Sullivan, Liu, Charles
• Primary Examiner(s): Spamer, Donald R
• Application Number:
  US15/858,446
• Publication Number:
  US 20190201564A1
• Time in Patent Office: 613 Days
• CPC Class Codes: A61L 2/0011 using physical methods
• CPC Class Codes: A61L 2/10 Ultraviolet radiation
• CPC Class Codes: A61L 2/14 Plasma, i.e. ionised gases
• CPC Class Codes: A61L 2/186 Peroxide solutions
• CPC Class Codes: A61L 2/202 Ozone
• CPC Class Codes: A61L 2/204 Formaldehyde
• CPC Class Codes: A61L 2/206 Ethylene oxide
• CPC Class Codes: A61L 2/22 Phase substances, e.g. smokes, aerosols or sprayed or atomised substances
• CPC Class Codes: A61L 2/24 Apparatus using programmed or automatic operation
• CPC Class Codes: A61L 2101/34 Hydroxy compounds
• CPC Class Codes: A61L 2202/11 Apparatus for generating biocidal substances, e.g. vaporisers, UV lamps
• CPC Class Codes: A61L 2202/122 Chambers for sterilisation
• CPC Class Codes: A61L 2202/14 Means for controlling sterilisation processes, data processing, presentation and storage means, e.g. sensors, controllers, programs
• CPC Class Codes: A61L 2202/15 Biocide distribution means, e.g. nozzles, pumps, manifolds, fans, baffles, sprayers
• CPC Class Codes: A61L 2202/16 Mobile applications, e.g. portable devices, trailers, devices mounted on vehicles
• CPC Class Codes: A61L 2202/24 Medical instruments, e.g. endoscopes, catheters, sharps
• CPC Class Codes: A61L 2202/25 Rooms in buildings, passenger compartments
• CPC Class Codes: A61L 2209/132 Piezo or ultrasonic elements for dispensing
• CPC Class Codes: A61L 2209/211 Use of hydrogen peroxide, liquid and vaporous
• CPC Class Codes: A61L 9/14 using sprayed or atomised substances including air-liquid contact processes
• CPC Class Codes: H05H 2245/36 : Sterilisation of objects, liquids, volumes or surfaces

Abstract

A method and apparatus for decontaminating substantially enclosed environments by using ultrasonic cavitation of a cleaning fluid to produce a low pressure, low air flow mist that can be activated by a nonthermal plasma actuator to create a cloud of activated hydroxyl species with the capacity to decontaminate articles, open surfaces or substantially enclosed spaces of pathogens, including bacteria, and other pathogenic microorganisms. An automated system and related non-transitory computer medium are also disclosed.

Claims

1. A system for decontaminating a substantially enclosed space, comprising:

a sensor for airborne pathogens, wherein the sensor is in networked communication with a computer processor;

wherein the computer processor is in networked communication with the sensor and a decontamination apparatus;

wherein the decontamination apparatus is in networked communication with the computer processor, and further wherein the decontamination apparatus comprises;

a side chamber;

a reservoir of cleaning fluid, wherein the cleaning fluid comprises a source of an active species for decontamination of a substantially enclosed space, wherein the active species is hydroxyl ions and wherein the source is hydrogen peroxide and the cleaning fluid is silver-free, chlorine-free and peracetic-acid free;

an ultrasonic cavitator comprising a proximal end and a distal end, wherein the ultrasonic cavitator is submerged in the reservoir;

a nonthermal plasma actuator, wherein the actuator activates a mist comprising aerosol droplets generated from the reservoir at substantially one atmosphere ambient pressure;

a funnel, wherein the funnel connects the nonthermal plasma actuator to the reservoir;

an outer tube, wherein the outer tube connects the nonthermal actuator to the external atmosphere; and

wherein a mist generated from the reservoir can pass through the funnel to the actuator, and further wherein after the mist is activated by the actuator to form plasma activated ionic particles carried by the aerosol droplets of the mist, wherein the plasma activated ionic particles are hydroxyl ions, the mist is dispersed through the outer tube to the external atmosphere.

2. The system of claim 1, wherein the nonthermal plasma actuator comprises a dielectric barrier discharge (DBD), cascaded dielectric barrier discharge, capacitative discharge, gliding arc discharge, resistive barrier discharge, plasma jet, pulsed spark discharge, glow discharge or a combination thereof.

3. The system of claim 1, wherein the non-thermal plasma generator is a volumetric DBD (VDBD) or a surface DBD (SDBD).

4. The system of claim 1, wherein the ultrasonic cavitator is connectively linked to a ultrasonic signal generator.

5. The system of claim 1, wherein ultrasonic cavitator is configured to generate aerosol droplets between 1 to 5 μ

m in diameter.

6. The system of claim 1, wherein the distal end of the ultrasonic cavitator comprises a piezoelectric disk, and wherein a piezoelectric transducer is configured to vibrate a surface of the piezoelectric disk as a surface of shearing cleaning fluid.

7. The system of claim 1, wherein the outer tube is connected to a housing comprising the reservoir.

8. The system of claim 7, wherein the housing further comprises a movable cart.

9. The system of claim 8, wherein the movable cart further comprises means for producing a sterilant gas selected from the group consisting of chlorine dioxide, ethylene oxide, ozone, propylene oxide, nitrogen dioxide, formaldehyde or a combination thereof.

10. The system of claim 8, wherein the movable cart further comprises a metal scrubber box, a blower and a carbon activated filter, wherein the metal scrubber box is structurally configured so that the blower pulls air though the carbon activated filter, and wherein a scrubber is formed by housing, blower and filter working in unison.

11. The system of claim 10, wherein the movable cart further comprises means for contacting the carbon activated filter with ultraviolet light in order to break down plasma activated ionic particles building upon on the filter.