Contaminant inhibition pathway control system
11574222 · 2023-02-07
Assignee
Inventors
Cpc classification
G06N7/01
PHYSICS
A61L2202/14
HUMAN NECESSITIES
H04L9/0872
ELECTRICITY
G06F9/4881
PHYSICS
H04W4/021
ELECTRICITY
International classification
G06N7/00
PHYSICS
H04W4/021
ELECTRICITY
H04L9/06
ELECTRICITY
Abstract
A system and method for contaminant control, often infection control, with multiple time and space domains that integrate active and passive infection control devices and processes that preferably feature infection control active additives with controllable dis-passivation to limit post-consumption environmental impact. Additionally, the system executes the infection control devices and process transactions by controlling the dispatch of infection control tasks centered around a potential infection control incidence and/or cross-contamination locations from assets or personnel having probabilistic infection rates to increase compliance of infection control preventative measures.
Claims
1. A contamination inhibition control and scheduling system comprised of an at least one mobile resource whereby the mobile resource is a multi-functional resource having an onboard computer system and a communication link to determine a travel movement pathway between a first location and a second location whereby the travel movement pathway is comprised of an at least one vector in a multi-dimensional space domain and an embedded gradient on a time domain whereby the time domain ranges from an earliest starting time to a latest ending time determining an at least one convergence point between the mobile resource and a known location between the first location and the second location, or between a first mobile resource of the at least one mobile resource and a second mobile resource of the at least one mobile resource in which a cross-contamination probability for an at least one disease state is established at each at least one convergence point and occurs at a convergence time.
2. The contamination inhibition control and scheduling system according to claim 1 whereby the cross-contamination probability is changed after the convergence time due to a confirmation of anyone of the at least one mobile resource having a known disease state to retroactively increase the cross-contamination probability for the known disease state.
3. The contamination inhibition control and scheduling system according to claim 1 whereby a mobile decontamination resource is dispatched to perform a decontamination task having a decontamination task time at least the convergence point having the increased cross-contamination probability or along the at least one vector in the multi-dimensional space domain having the time domain after the convergence time.
4. The contamination inhibition control and scheduling system according to claim 1 whereby the at least one vector within the travel movement pathway is encrypted and contained within a distributed ledger and whereby the encryption utilizes an encryption key based on an identity of the at least one mobile resource and a location geofence in which the at least one convergence point is within.
5. The contamination inhibition control and scheduling system according to claim 1 whereby the at least one mobile resource moves at a speed during its travel movement pathway from a first location to a second location and whereby the speed is a function of a change in the cross-contamination probability.
6. The contamination inhibition control and scheduling system according to claim 1 whereby each travel movement pathway has a probability function of disease contamination represented by a series of vectors within the travel movement pathway for each of the at least one disease states.
7. The contamination inhibition control and scheduling system according to claim 1 creates a historic record of each incident of the at least one convergence point as a function of the at least one disease state whereby an aggregate of the historic records is used to identify an at least one disease state hotspot wherein the hotspot has a high-frequency of incident occurrences.
8. The contamination inhibition control and scheduling system according to claim 3 whereby the probability of cross contamination is determined as a function of convergence time at the convergence point, a differential in time between the convergence time and the decontamination task time.
9. The contamination inhibition control and scheduling system according to claim 1 creates a series of decontamination tasks as a function of the cross-contamination probability.
10. The contamination inhibition control and scheduling system according to claim 1 maintains for each at least one disease state parameters including a method of contamination, a minimum incubation period, a maximum dormancy period, and a minimum decontamination time for each of an at least one method of decontamination.
11. The contamination inhibition control and scheduling system according to claim 1 creates a historic record of an at least one potential infection disease source specifically linked to the least one convergence point.
12. The contamination inhibition control and scheduling system according to claim 1 further comprised of an at least one persistent infection control device or process or material composition having an active agent, an at least one fast-acting infection control device or process to reduce an incidence or contamination of infection rate by at least 5% greater than the maximum of an individual of the at least one persistent infection control device or process or an individual of the at least one fast-acting infection control device or process.
13. The contamination inhibition control and scheduling system according to claim 12 whereby the system preferentially selects the at least one persistent infection active agent that thermally disassociates to a material composition comprised of greater than 95% water and carbon dioxide.
14. The contamination inhibition control and scheduling system according to claim 12 whereby the system preferentially selects the at least one persistent infection active agent with a material composition void of nanoscale additives and metals, metal oxides, and metal salts.
15. The contamination inhibition control and scheduling system according to claim 12 whereby the system preferentially selects the at least one persistent infection active agent having a persistence time greater than a reapplication maintenance time interval and a killing rate faster than the products average time interval at the at least one convergence point.
16. A contamination inhibition control and scheduling system comprised of an at least one mobile resource whereby the mobile resource is a multi-functional resource having an onboard computer system and a communication link to determine a travel movement pathway between a first location and a second location whereby the travel movement pathway is comprised of an at least one vector in a multi-dimensional space domain and an embedded gradient on a time domain whereby the time domain ranges from an earliest starting time to a latest ending time determining an at least one convergence point between the mobile resource and a known location between the first location and the second location, or between a first mobile resource of the at least one mobile resource and a second mobile resource of the at least one mobile resource in which a decontamination probability for each disease state is established at each at least one convergence point.
17. A contamination inhibition control and scheduling system comprised of an at least one mobile resource whereby system has means to determine a travel movement pathway between a first location and a second location whereby the travel movement pathway is comprised of an at least one vector in a multi-dimensional space domain and an embedded gradient on a time domain whereby the time domain ranges from an earliest starting time to a latest ending, whereby the at least one mobile resource contaminates a contamination point at a contamination time within the multi-dimensional space, whereby the system aggregates a historic record of contamination points, whereby the system calculates time intervals between each of the historic records of contamination points at the contamination time, and whereby the system assigns an at least one infection control means from an at least one persistent infection control device or process or material composition having an active agent, an at least one fast-acting infection control device or process to reduce an incidence or contamination of infection rate by at least 5% greater than the maximum of an individual of the at least one persistent infection control device or process or an individual of the at least one fast-acting infection control device or process, or an immediate disinfection method, wherein the at least one infection control means reduces a probability of cross-contamination by at least 50% for each contamination point based on an at least statistical median greater than the calculated time interval at the respective contamination point.
Description
BRIEF DESCRIPTION OF DRAWINGS
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DEFINITIONS
(13) The term “mode” is a characterization of a mobile resource into segmented context by at least two locations, one of the current location and the other of a dynamically altering location as a function of time, co-located mobile resources, or adjoining geofences. The preferred embodiment determines mode through the utilization of at least three locations comprised of current location, past location(s), future location(s) centered around a specific user. The particular preferred embodiment determines mode by at least three locations for multiple interacting users.
DETAILED DESCRIPTION OF INVENTION
(14) Here, as well as elsewhere in the specification and claims, individual numerical values and/or individual range limits can be combined to form non-disclosed ranges.
(15) Exemplary embodiments of the present invention are provided, which reference the contained figures. Such embodiments are merely exemplary in nature. Regarding the figures, like reference numerals refer to like parts.
(16) The invention significantly reduces the incidence and contamination of contagious disease states across the combination of multiple time and space domains.
(17) Pathways of Cross-Contamination
(18) The location(s) of potential true-cross points is vital to determining the cause and effect of a cross-contamination incident. The determination of location, as established by concurrently filed patent on location determination is noted below for reference.
(19) In addition, the establishment of pathways is important in contamination determination notably as specific pathways have specific disease states in which transference of contaminants can take place. For example, E. coli is a disease state largely associated with contaminated food. The incidence of Legionnaires is associated with contaminated water.
(20) The system features multiple pathways, each pathway having a probability function for each disease state of importance within the overall ecosystem. The pathways include individual pathways that are preferably represented by a vector having both a time and space domain, which is further represented by a probability mapping to fill in location gaps understanding that the most important location mapping being for potential contamination hotspots. The preferred embodiment of the system has pathways, such as in a hospital, for each employee, each patient, each piece of equipment notably mobile resources, and for each delivered utility such as air (purified and conditioned air from an HVAC system), water, food, pharmaceuticals/nutraceuticals, etc. Each pathway is further comprised of potential contamination hotspots, with hotspots ranging from common area items (e.g., elevator buttons, door handles, etc.) to patient room items (e.g., bed trays, bed rails, patient monitoring and/or dispensing equipment). Mobile resources include shuttles for the delivery of food, movement of patient biological samples (e.g., blood, urine, etc.), delivery of pharmaceuticals from the pharmacy, patient wheelchairs or pre-surgical or diagnostic testing gurneys, cleaning devices such as floor cleaning, vacuum cleaners, wall cleaners or even roaming decontamination equipment whether dedicated mobile resources or multi-functional mobile resources such that a cleaning piece of equipment has onboard means to further decontaminate hotspots (i.e., an ion generator focused onto a hotspot as the mobile resource moves between a departure point and an arrival point to perform a specific primary or secondary task).
(21) As noted earlier, a critical feature of the system is to determine the location of a mobile resource accurately, at least relative to a location in which a task must be performed. An even more critical feature of the system is to determine converging intersection points on a time and space domain (i.e., overlapping vectors predominantly matter when they occur in approximately the same time). It is an object of the system to represent location, as represented by a vector when it is precisely and accurately known in a gradient (preferably a color, or as known in the art any numerical representation of a color or pattern that varies as a function of time (such that like colors represent like time) and from the start of the vector to the end of the vector based on time. When location is not precisely known, it is represented by a geofence. The geofence is optimally represented by a varying probability gradient, in which the probability gradient provides a relatively higher projection of actual location likelihood. The probability gradient is established by the combination of historic records establishing a pattern of travel times between known precise locations (e.g., points in which known tasks are performed at known locations, or GPS determined locations in which it is known that location error is less than a specific error threshold limit in percentage or absolute length) such that future times in which travel between the same known locations enables an increased accuracy of precise locations in between those same known locations (that otherwise have location errors that are beyond the specific error threshold limit. The location vector has an integral color (or pattern) that varies along the time domain, such that the key differentiation is a visually recognizable similarity function (i.e., the human eye or graphical processing unit recognizes the color or pattern at a point of convergence as being approximately identical, at least within a similarity threshold limit). When the location has a degree of uncertainty the location vector is represented by a geofence vector having an integral color (or pattern) along with an optional probability profile (or a probability map of individual locations based on known prior high-certainty locations, or additionally in combination with future known (or anticipated) high-certainty location(s) when looking forward in time). This feature of the invention also enables superior accuracy of retroactive location gap filling.
(22) The system aggregates as many as possible historic records for each recognized contamination point. The aggregated historic records are utilized to calculate the time interval between sequential and subsequent contamination points at the contamination time. The particularly preferred system continuously monitors and assigns (re-assigns) infection control methods as specific determined from a range of decontamination methods including persistent infection control device or process or material composition having an active agent, fast-acting infection control device or process to reduce an incidence or contamination of infection rate by at least 5% greater than the maximum of an individual decontamination method or even the dispatching of an immediate disinfection method (e.g., UV or chemical disinfection or ion generator or ozone, etc.) with a minimal goal of reducing the probability of cross-contamination by at least 50% for each contamination point based on the statistical median calculated time interval at the respective contamination point. The particularly preferred goal is reducing probability of cross-contamination by at least 80%, or specifically preferred goal by at least 90%.
(23) Known locations are established by multiple means including the performance of a task through a device having a known location in which the device communicates via wired (e.g., Ethernet) or wireless (e.g., low-energy Bluetooth, NFC) such that the highest accuracy of location is established by either the fixed location Ethernet or the wireless method with the lowest range.
(24) It is a feature and an object of the invention to fill in the gaps of location knowledge, whether the prior knowledge of a precise location is not known at all or the location is represented in the past by a geofence (preferably with a probability gradient), such that the gap(s) is replaced by a precise vector (or simply a geofence having a more precise probability gradient). One instance in which precise location knowledge is desired, even though the mobile resource is no longer at that location, is in establishing likelihood of cross contamination retroactively after an infection has been obtained, transaction fraud prior to the shipment of an ecommerce order, and projections of future location when resources travel relatively repetitive routes (such as employees within a hospital). It is a feature and an object of the invention to maintain historic location data as obtained in real-time for each location (preferably on a continuous vector mapping) with a set of non-real-time adjusted location data such that the combination of the real-time location and the non-real-time location adjustment provides a more precise predicted real-time location. It is understood that the non-real-time location adjustment is a function of at least one of the precise location or the real-time location point. The non-real-time location adjustment is preferably also a function of the actual mobile resource and optionally also as a function of time. The particularly preferred non-real-time location adjustment is further as a function of a known presence of an at least a second mobile resource object or an at least first inanimate object (which can have more than one position e.g., door that is open or closed) that in fact impacts the location precision when the first mobile resource is in proximity with the at least a second mobile resource. Retroactive improvements of location data occur by analytical inclusion of subsequent data records through knowledge of then future performance of primary tasks or secondary tasks at known locations. More specifically, there are gaps of precise (or even general) location knowledge that occur (most notably from loss of location-determination signals e.g., global positioning systems “GPS” whether the GPS is an indoor or outdoor GPS or simply uses wireless triangulation as known in the art) such that during the occurrence of a particular task (or event, such as opening a door as the mobile resource moves between locations) the precise location is not yet known. Yet, when the mobile resource performs a task or event at a both known time and known location (or within a known geofence) this action establishes a probability profile for past tasks or events (in other words, if a task took place on the 2.sup.nd floor of a hospital at 11:00.00 AM there is a very low probability that the same mobile resource would be on a floor above or below the 2.sup.nd floor at 10:59.50, especially if the location is not near an elevator or staircase, or if it is known with certainty that no mobile resource was located in an elevator or staircase in between those times). The inventive system uses both known occurrences of an at least one second task in terms of precise time and location, and/or known absences of tasks in terms of precise time and location, or combinations thereof to establish a location probability for a first task in terms of precise time and location that is a function of precise time and location for the at least one second task, and/or for the known absence of tasks within a precise location (or geofence) within a known time range.
(25) It is another object of the invention to create a comprehensive record of location as a function of time for each mobile resource, recognizing that a mobile resource can be a person guided device, a semi-autonomous or autonomous guided device, or even a person qualified to execute primary and/or secondary tasks such that the person is mobile and the device that the person uses has no independent means of movement. When location data is for a specific person the maintenance of personal privacy is essential. Yet, serving the specific person (i.e., operator) with superior precision requires extraction of location knowledge. It is an object of the invention to segment the access to personal location data notably by leveraging a distributed database (with multiple encryption keys, preferably with access control by a function of both a mode and a geofence) also referred to as a distributed ledger such that the distribution of location data is by at least one of a) mode, b) geofence, or specific data server representing location data by a combination of mode and geofence. It is recognized that specific geofences maintain data that is not only proprietary to the individual person but also business or contextually sensitive to the host business/purpose of that specific geofence. One exemplary host business is a hospital (or medical campus) in which strict privacy laws provide guidance and control of access to sensitive location data linked to a specific individual person. Yet, it is an object of this invention to repackage this highly sensitive comprehensive location into reduced sensitivity packets. The distributed ledger of location data is segmented by mode (e.g., exercise, home, work, medical, personal, etc.) even within a private geofence. Specifically, the distributed ledger database preferably utilizes rules-based logic and mode functions to create location offsets in which the offset is a function of time, mode, and/or rules-based logic or combinations thereof. The purpose of a location offset is to ensure that the absolute location can't be accessed, yet relative location data can be accessed. One exemplary incidence in which relative location information is desired but absolute location information needs to remain private is an exercise application such that the exercise application desires to calculate or track data including number of steps, calories burned, velocity and/or acceleration rates etc. yet the actual instance that the absolute location is within a hospital or an armed forces forward operating base must remain secret. In the context of a hospital environment a staff member such as a physical therapist is authorized to track physical activity but should not have knowledge of specific activities such as bathroom activity, medical testing procedures, etc. In other words, access to specific location information is a function of at least mobile resources (i.e., the mobile resource requesting information and the mobile resource owning the information). Location offsets are preferably encrypted utilizing a non-linear or linear function that can be further switched between varying non-linear or linear functions in accordance to further rules-based logic as a function of time. Personal location data is segmented into access type between public and private. Private data is provided within the guidelines of secure access in packets that include at least: a) summary of mode data, b) redacted data of specific modes such as healthcare specific modes, c) segmentation data by mode outside of healthcare specific modes, and d) data containing offsets.
(26) The system incorporates a process to utilize the individual collection of pathways as represented by vectors having location/space and time domains. An important feature is such that every potential contamination hotspot, also just referred to as “hotspot”, has detailed database of mobile resources that pass through the hotspot whether the hotspot represented by a specific tightly referenced location point or a geofence such that at a minimum the mobile resource entry and departure time is provided for each hotspot. In the event of a contamination incidence event, the time and location of such incidence event is utilized to determine potential contamination hotspots with their respective probability mappings for each disease state taking into account all of the converging pathways and their respective hotspots. The system monitors, tracks, calculates, and dispenses a probability report for each linked potential hotspot to the initiating contamination incidence event. The system then subsequently dynamically configures at least one method to reduce contamination potential with the specific goal of reducing the statistical probability of a incidence event recurrence (whether it be for a same disease state, such as a microbial cluster in a surgery sink, or a different disease state, such as a human resource failing to practice consistent or thorough hand-hygiene practices).
(27) It is another feature of the system such that a frequency interval for an immediate decontamination method is increased at hotspots having a relatively higher contamination incidence events. Another feature of the system is dynamically altering an embedded decontamination method at the hotspot such that the time to decontamination probability reduction is decreased so as to accelerate decontamination process by accelerating the release of an otherwise unstable decontamination active so as to reduce the probability of transference.
(28) Variable Decontamination Rate
(29) A fundamental feature of the system is the dynamic configuration of the decontamination method, notably the rate in which at least an approximate 10% statistical reduction of cross-contamination is achieved (though preferably at least 25%, particularly preferred at least 50%, and specifically preferred great than an 80% statistical reduction in contaminant transference. All things equal the faster the decontamination rate the less long-term persistence time; thus, the decontamination rate is a balancing act between the requirement to replace the decontamination method (i.e., replace surface coating having active antimicrobial or “refresh” through reinfusion of otherwise unstable decontamination active into the coating) or implement a secondary task (e.g., immediate decontamination method such as ion generation, UV exposure, or application of disinfectant) so as to “reset” the hotspot to a clean state.
(30) Lifecycle Impact
(31) Virtually all decontamination methods have the potential to have an adverse impact on post-use downstream processes whether the adverse impact limits effectiveness of processes such as waste-water treatment, garbage disposal, or thermal heat recovery from thermal incinerators due to salt corrosion or scale formation. A significant feature of the system is the dynamic configuration of decontaminant methods such that post-use can be virtually eliminated through a thermal decomposition process converting the decontaminant method (i.e., antimicrobial notably an otherwise unstable active) into non-harmful gases (e.g., carbon dioxide, water/steam, carbon monoxide, and potentially with nitrogen gas).
(32) The inventive system utilizes an HAI detection module to initiate the step of converging on a common convergence point in the time and space domain for determining a source of the HAI; utilize the history events of assets, employees, etc. to create a probabilistic assessment of the source, and to create and generate the dispatching of persistent, non-persistent, and fast-acting antimicrobial tasks; changing the time interval of non-persistent and fast-acting antimicrobial tasks proactively and monitoring the future incidence of HAI at the same source.
(33) The inventive system utilizes a location-based system that monitors disinfectant processes, such as and including hand-washing or the otherwise application of fast-active disinfectant processes to establish a probability of disinfectant effectiveness for that respective individual disinfectant process for the respective HAI source and/or contamination asset. The probability of disinfectant effectiveness is normalized to a statistical representation of the respective HAI source for the full set of contamination assets (e.g., employees, carts across pathways), as well as variations for the respective contamination asset normalized to the range of HAI potential sources of the same category as a function of type of HAI potential source (e.g., hand-washing, application of fast-acting disinfectant process, application of persistent antimicrobial process, application of non-persistent antimicrobial process). Deficiencies (i.e., non-compliant tasks) at the HAI potential source and contamination asset leads to the dispatch of supplemental persistent, fast-acting, or non-persistent antimicrobial processes to offset the deficiency. Furthermore, the system modifies the contamination asset disinfectant effectiveness rating so that future probabilistic tasks are directly impacted on HAI potential sources as a function of the contamination asset and further as a function of time in combination with the specific space domain of the HAI potential source.
(34) Yet another aspect of the HAI potential source is the time duration between a first and then a second contamination asset interaction at a respective HAI. The inventive system dispatches fast-acting or disinfectant application assets to apply antimicrobial measures to the HAI potential source asset, notably the application is deployed to assets ranging from personnel that already have a reservation that includes the movement from a first location to a second location in which the routing includes or can include an intermediate and temporary stop between the departure time from the first location and the arrival time at the second location. Exemplary assets include autonomous or semi-autonomous assets that are configured with at least one method of executing the disinfectant application measure. Another exemplary asset includes a person (e.g., notably an employee, or an integral measure on the HAI potential source asset) in which the system schedules a reservation to perform the disinfectant application measure. Yet another aspect of the system is the coordination of the disinfectant application measure, particularly a measure that is integral to an HAI potential source such that the system dispatches a reservation to switch between a short-range and a long-range disinfectant application measure. An exemplary of this short-range and long-range disinfectant application measure is a corona discharge device that has at least a two-position discharge range in which one of the at least two positions are at least 10% and preferably at least 50%, and particularly at least 90% of the smaller inhibition zone than the otherwise long-range disinfectant measure relative to the short-range disinfectant measure (e.g., an integral corona discharge device that in the short-range mode discharges ions onto a door handle, and that the long-range mode discharges ions broadly into the door passage area in which the door for the respective door handle swings open and close). There are multiple methods of varying the inhibition zone, including by limiting the discharge current further enabled by using wires having a small radius that has the further advantage of significantly reduced ozone production. The further combination of corona discharge to create ion wind, has parameters as known in the art, to vary ion discharge range so as to switch between modes in which the short-range (e.g., door knob) is subject to a fast-acting disinfection (such that disinfection occurs between subsequent and sequential touching instances), and a mode for broader disinfection in which the ions acting on the short-range (e.g., door knob) are minimized. It is a goal of the invention to switch between modes in which ions extend beyond the short-range by varying active electrode zone, discharge current, charge of the short-range smaller inhibition zone, ion wind emitting speed, and active electrode zone voltage while optionally also varying charge of the long-range larger inhibition zone.
(35) Microbes have a negative surface charge and thus ions having positive charge are both attracted to their surface disturbing their electric balance therefore disrupting their electron transfer.
(36) It is understood that references to Hospital Acquired Infections “HAI” are predominantly referenced in this invention, however the invention addresses all nosocomial infections, which are defined using the broader definition of an infection that is contracted because of an infection or toxin that exists in a certain location (also including day care, public spaces such as airports, trains, etc.) or transferred between and amongst people directly, or via dispersion or surface interaction. As a further point of reference, people now use nosocomial infections interchangeably with the terms health-care associated infections (HAIs) and hospital-acquired infections.
(37) Combination of omniphobic low-adhesion smooth surface coating, ion wind generator having low ozone production, and corona discharge. The utilization of a smooth surface coating having low adhesion.
(38) {optional} The coating further comprised of a persistence antimicrobial active. The coating having a static decay time of faster than 15 seconds at a relative humidity greater than 30% {preferably a static decay time of faster than 1 second, and particularly preferred of faster than 0.2 seconds} to reduce the attraction of microbes to the active surface. One exemplary material is Teslin as manufactured by PPG. This is a particularly important feature as people interact with the substrate and would otherwise experience static shock (an electrostatic discharge that rapidly achieves charge neutralization).
(39) Solution is comprised of a substrate having a first portion and second portion of the substrate, with or without coating, having a static decay time faster than 15 seconds (preferably faster than 1 second, particularly preferred to faster than 0.2 seconds); an ion wind generator whereas the ion wind generator is configured in a mode to “vacuum” particulate away from the first portion of the substrate and a concurrent positive charge ions are generated to deactivate any of an at least one of virus or bacteria on the first portion or second portion of the substrate.
(40) Further comprised of a wind channel whereas the wind channel directs the ions from the first portion to the second portion of the substrate.
(41) Further comprised of a means to rotate or move the substrate such that the position of the first portion of the substrate is exchanged with the second portion of the substrate.
(42) Further comprised of a filter downstream of the first portion of the substrate and downstream of the ion wind generator, and upstream of the second portion of the substrate. The preferred filter is also comprised of a substrate having a static decay time faster than 15 seconds. The particularly preferred filter has a coating to reduce adhesion of dust, viral, and/or bacterial contaminants. The specifically preferred filter has a homogenous porosity of less than 300 nanometers (yet preferred less than 100 nm, or less than 60 nm) in which the filter and its porosity is homogenous through a single layer.
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(55) Although the invention has been described in detail, regarding certain embodiments detailed herein, other anticipated embodiments can achieve the same results. Variations and modifications of the present invention will be obvious to those skilled in the art and the present invention is intended to cover in the appended claims all such modifications and equivalents.