Sanitizing mat

Abstract

The present invention relates to sanitization devices and methods. More particularly, the invention relates to devices and methods that significantly reduce or eliminate germs, bacteria and/or other microorganisms from objects such as bags, purses, footwear or other objects, as well as bare feet, hands, paws, hooves or other anatomical surfaces, which come into contact with them. The device and method uses germicidal radiation which exposes only the areas of the object that come into applied contact with the device. The device contains an array of individual cells which are configured to turn on and off sanitizing radiation. The devices may be interconnected to fill a large area such as a lobby, the floor of a hospital and the like.

Claims

1. A sanitizing apparatus comprising: a housing comprising a top, a bottom and sides, wherein the volume of the housing is segmented into an array of individual, interconnected, cells, each cell having sides that define the cell, wherein the sides of the cells comprise structural material and are positioned orthogonal to the bottom of the housing and extend from the bottom of the housing fully or partially to the top of the housing, each cell comprising, at least one of a sanitizing radiation emitter, an infrared radiation sensor, and a visible radiation sensor, positioned in the bottom of the cell.

2. The apparatus of claim 1, wherein the housing top comprises a structural layer positioned covering the tops of the cells, wherein the layer allows at least a portion of the sanitizing radiation to pass through.

3. The apparatus of claim 1, wherein the infrared radiation sensor is electronically coupled to the sanitizing radiation emitter, and wherein the sanitizing radiation emitter is capable of being activated when the infrared sensor senses no infrared radiation.

4. The apparatus of claim 1, further comprising electrical connectors wherein the electrical connectors are configured to allow at least two apparatuses to be electronically connected.

5. The apparatus of claim 1, further comprising a low frequency transducer, wherein the low frequency transducer is capable of vibrating debris to allow sanitizing radiation to impinge under at least a portion of the debris.

6. The apparatus of claim 1, wherein the sidewalls of the individual cells comprise a recess into which individual plugs may be positioned into the top of each cell, wherein the plug comprises a thickness that allows the top surface of the plug to be essentially level with the top to the unrecessed portion of the cell sidewall, and wherein the plug is comprised of material which allows at least a portion of the sanitizing radiation to pass through.

7. The apparatus of claim 6, wherein the infrared radiation sensor is electronically coupled to the sanitizing radiation emitter, and wherein the sanitizing radiation emitter is capable of being activated when the infrared sensor senses no infrared radiation.

8. The apparatus of claim 6, further comprising electrical connectors wherein the electrical connectors are configured to allow at least two apparatuses to be electronically connected.

9. The apparatus of claim 6, further comprising a low frequency transducer, wherein the low frequency transducer is capable of vibrating debris to allow sanitizing radiation to impinge under at least a portion of the debris.

10. The apparatus of claim 6, wherein each cell further comprises a shutter mechanism.

11. The apparatus of claim 10 further comprising a sensor switch coupled to the shutter mechanism whereby the shutter mechanism is capable of opening and closing when a sensor switch is activated and deactivated.

12. The apparatus of claim 11, wherein the sensor switch is chosen from a pressure switch, a light switch, a contact switch, a toggle switch, an electrical switch, and a mercury tilt switch.

13. The apparatus of claim 10, wherein the infrared radiation sensor is electronically coupled to the sanitizing radiation emitted, and wherein the radiation emitter is capable of being activated when the infrared sensor senses no infrared radiation.

14. The apparatus of claim 10, further comprising electronic connectors wherein the electronic connectors are configured to allow at least two apparatuses to be electronically connected.

15. The apparatus of claim 10, further comprising a low frequency transducer, wherein the low frequency transducer is capable of vibrating debris to allow sanitizing radiation to impinge under at least a portion of the debris.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) FIG. 1 shows a graphic representation of a side view of an exemplary embodiment of the sanitizing apparatus of current disclosure designed to eliminate or significant reduce undesirable or pathogenic microorganisms from objects with sides removed so that the inner structures can be seen and explained.

(2) FIG. 2 shows a graphic representation of a top view of an exemplary embodiment of the sanitizing apparatus of current disclosure showing a honeycomb configuration of the array of cells.

(3) FIG. 3 shows a graphic representation a single cell 14 positioned within the housing of the current disclosure.

(4) FIG. 4 shows the Germicidal Effectiveness Curve as well as the peak outputs of UVC and UVB LED radiation emitters compared to relative intensity

(5) FIG. 5 shows an embodiment of the current disclosure wherein the top of each individual cell is covered with a plug made of structural material.

(6) FIG. 6A shows a further embodiment of the current disclosure in which shutters are in a closed position.

(7) FIG. 6B shows a further embodiment of the current disclosure in which shutters are in an open position.

DETAILED DESCRIPTION OF THE DISCLOSURE

(8) As used herein the term UVC refers to electromagnetic radiation with wavelengths ranging between 100-280 nanometers, inclusively.

(9) As used herein the term UVC refers to electromagnetic radiation with wavelengths ranging between 280-315 nanometers, inclusively.

(10) A sanitizing apparatus is provided for the elimination or significant reduction of undesirable or pathogenic microorganisms from objects, containing a housing having a top, a bottom and sides, wherein the volume of the housing is segmented into an array of individual, interconnected, geometrically shaped cells, each cell having sides that define the cell. The sides of the cells are made of structural material and are positioned orthogonal to the bottom of the housing and extend from the bottom of the housing fully or partially to the top of the housing, each cell having at least one of a sanitizing radiation emitter, an infrared radiation sensor, and a visible radiation sensor, positioned in the area of the bottom of the cell.

(11) FIG. 1 shows a graphic representation of a side view of an exemplary embodiment of the sanitizing apparatus of current disclosure designed to eliminate or significant reduce undesirable or pathogenic microorganisms from objects containing a housing 10, with sides removed so that the inner structures can be seen and explained, a bottom 18 and a top 20. A grid of geometrically shaped cells 14 is positioned within the volume of the housing 10, and running from the bottom to fully or partially to the top. Positioned at the bottom of each cell 14 are at least one component chosen from a sanitizing radiation emitter, an infrared radiation sensor, and a visible radiation sensor 16.

(12) The housing 10, including the bottom, the sidewalls and the geometrically shaped cells 14 may be made from any of a number of structural materials well known in the art including, for example, plastic, metal, wood and other structural material. The walls of the cells 14 may be made from material which is reflective to UV sanitization radiation, for example UVB and/or UVC radiation, such as, for example, aluminum. Alternatively, the walls of the cells may have a coating or other surface treatment that allows reflection of UV sanitization radiation, for example UVB and/or UVC radiation, such as, for example, aluminum. The reflective surfaces may help to direct stray sanitizing radiation to the top of the housing and onto surfaces to be sanitized thus providing increased radiation intensity. The cell walls could be vertical or could be slanted in or out depending on the desired design of the device and the design for collecting stray light and reflecting it upward toward the object to be sanitized.

(13) The top of the device 20 comprises a structural layer covering the tops of all the individual cells contained in the housing and may be made from any structural material which can hold weight up to about 400 pounds and also allow at least a portion of the sanitizing UVC and/or UVB radiation, to pass through to the object being sanitized, such as, for example, plexiglass, quartz glass, polythene and the like. Although not shown, the devices may be fitted with shock absorbing materials positioned between the top and areas where the top comes into contact with the housing and/or the cell walls. Usefully materials for shock absorbing are well known in the art and include, for example, silicone pads, rubber inserts and the like.

(14) FIG. 2 shows a graphic representation of a top view of an exemplary embodiment of the sanitizing apparatus of current disclosure 10 designed to eliminate or significant reduce undesirable or pathogenic microorganisms from objects showing a honeycomb configuration of the array of cells 14 that fill the volume of the housing 12. Also shown, positioned at the bottom of each cell 14 are at least one of a sanitizing radiation emitter, an infrared radiation sensor, and a visible radiation sensor 16.

(15) FIG. 3 shows a graphic representation a single cell 14 positioned within the housing of the current disclosure. The cell contains a UV LED radiation emitter 22, a visible/IR light sensor 20, and a blue LED emitter 24. Also graphically represented is a circuit board 26 which electronically interconnects the components, and microprocessor/logic 30 which controls the actions of the device.

(16) The one or more UV LED radiation emitters 22 can predominantly emit a wavelength of 254-265 nm.

(17) The most effective wavelength for killing or inactivating microorganisms is the 100-290-nm range, which is the UVC wavelength band. It is composed of short wavelengths from 200 to 280 nm. Currently commercially available LED lamps that give off wavelengths in the UVC spectrum, which is near the optimum for killing or inactivating microorganisms are useful for the present disclosure. Low-pressure mercury-vapor lamps can also be used in the present disclosure but are less desirable because they are larger than LED devices. UVC and UVB LED emitters contain silicon lenses which offers protection, long life and structural stability.

(18) Not to be held to theory, a wavelength of UVC and or UVB radiation will break down the molecular bonds within the DNA of micro-organisms producing thymine dimers in their DNA thereby destroying them, rendering them harmless or prohibiting growth and reproduction. It is a process similar to the UV effect of longer wavelengths UVB on humans.

(19) FIG. 4 show the Germicidal Effectiveness Curve as well as the peak outputs of UVC and UVB LED radiation emitters compared to relative intensity. As can be seen the LEDs emit quite readily in the germicidal areas. As can also be surmised, the device of the current disclosure can contain more than one LED which can emit in other specific areas of the UV spectrum to cover more wavelengths. The choice of LED emitters may be driven by what pathogen is desired to receive maximum exposure to sterilizing radiation.

(20) As an example, commercially available UVC LED germicidal lamps range in input power from about 220 to 500 μW/cm.sup.2 at a distance of 1 meter from the tube. Power intensity of approximately 1400 to 2800 μW/cm.sup.2 measured at a distance of 1 inch from the LED surface is achievable.

(21) Again not to be held to theory, it has been reported that to reach a 99% kill rate of bacillus anthracis a dosage of 8,700 μW second/cm.sup.2 is required. Thus, in the current example and using the equation: Intensity×Exposure Time=μW second/cm.sup.2, a lamp with a minimum power intensity of 1400 μ/cm.sup.2 at 1 inch from the bulb surface, an exposure time of less than 7 seconds is required. Of course a longer time will improve the kill rate for bacillus anthracis. Other notable 99% kill rate exposure requirements for UVC (measured in μW/cm.sup.2) are: E. coli=6500, Salmonella typhosa=6000, Dysentery=4200 and Cholera=6500. It should be noted that in the example a 7 second exposure would be sufficient to provide a 99% kill rate of all the aforementioned bacteria. Viruses are also killed by UVC, some of the toughest being poliovirus and rotavirus, which require 21,000 μW/cm.sup.2 for a 99% kill rate. Thus using the lamps of the above example, a 15 second exposure would provide a 99% kill rate. Also molds and yeasts can be killed by UVC exposure.

(22) In one embodiment of the current disclosure the apparatus contains a visible and/or infrared radiation sensor which is electronically coupled to the UVC/UVB sanitizing radiation emitter. In operation, the visible/IR sensor registers ambient light such as visible and/or infrared light, and sends a signal to the microprocessor which sends a signal to the LED to remain off. When an object, such as, for example, a person's shoe covers the cell, the vis/IR sensor receives no vis/IR light and signals the microprocessor that no vis/IR is being sensed and the microprocessor will send a signal to the UVC/UVB LED to start emitting sanitizing radiation which then starts the sanitization process for the bottom of, in this example, the shoe. Thus, only when the cell is covered will UVC/UVB radiation be emitted from the LED emitter. When the object, such as a shoe, uncovers the individual cell, the vis/IR sensor will sense vis/IR radiation and send a signal to the microprocessor to shut off the UVC/UVB LED. This device and method prevents stray UVC/UVB radiation from escaping into the environment where it is undesirable.

(23) The apparatuses are configured to run on readily available electric power from a wall socket or they may be hard-wired into an electric system either 110 or 220 volt or the like. In some embodiments the apparatuses are configured to be interconnected such that an array of apparatuses can fill a large space, such as, for example, the floor of a lobby, an airport terminal, the floor of a hospital, bathroom floors, hallways, or any large area where sanitization of the bottom of objects such as shoes, boots, etc. is desired. While interconnected each apparatus and cell works independently to activate and deactivate the sanitizing radiation. In practice some or all of the apparatuses may be interconnected. In the array embodiment, for example, a person can walk across the array as the soles of the shoes get sanitized. During a step, the sole dynamically covers and uncovers the individual cells. Thus portions or all of the sole are being sanitized at any one particular time while a person is walking across the array of sanitizing apparatuses.

(24) In another embodiment of the current disclosure the apparatus further contains a low frequency transducer. The low frequency transducer is designed to send ultrasonic waves through the cell walls as well as through the air contained in each cell to vibrate particles and other debris so that the UVC/UVB radiation may expose areas under the debris in order to obtain a more complete sanitization. Since sanitizing radiation is a line of capable of vibrating debris to allow sanitizing radiation to impinge under at least a portion of the debris.

(25) As mentioned the cells many be covered with a structural layer that cover the tops of all the cells contained in the housing. In another embodiment, and shown in FIG. 5 the top of each individual cell is covered with a plug made of structural material. As used here in the term plug means a piece of material which fits into the top of one cell. In FIG. 5 the plug 36 fits into the cell 30 and is supported by a recess 34 in the cell sidewall 32. Also shown are the microprocessor 38, the Vis/IR sensor 40, the UVC/UVB LED emitter 42 and a blue LED 44. The plug is made from the structure materials mentioned supra that allow at least a portion of the Vis/IR/UVC/UVB radiation to pass through. The thickness of the plug may be chosen to allow the top of the plug to be essentially level with the top of the cell sidewall. Of course other configurations may be used such as, for example, the plug may act as a lens having a convex surface for focusing the radiations, the plug may fit slightly higher or lower than the top of the cell walls for purposes, such as, for example, ease of cleaning.

(26) A further embodiment of the current disclosure includes a shutter mechanism which opens and closes to allow sanitizing radiation to pass through to the object being sanitized. As shown in FIG. 6A the cell contains sensors 50, in this case, pressure sensors beneath the plug which send a signal to the microprocessor 38 which then signals the shutters 52 to open and signals the UVC/UVB LED 42 to emit sanitizing radiation. FIG. 6B shows the shutter in an open position. The sensors may be, for example, pressure sensors, optical sensors, contact switches, toggle switches, electric switches, or tilt switches, which signal that something is positioned on the cell for sanitization. The shutter may be any of a number of materials well known in the art with mechanisms that will open the shutters and in some cases pivot around an axel, not shown. In other embodiments the shutters may include mechanisms such as, for example, “muscle wires” or piezoelectric mechanisms to open and close the shutters. A muscle wire is an extremely thin wire made of nickel-titanium alloy that contracts when an electric current is applied and releases back to its original position when the electric current is removed. In the current disclosure the muscle wire would receive an electric signal from the microprocessor to contract and release, opening and closing the shutters when the sensor under the plug is activated.