Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
  • A61L2/16—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using chemical substances
  • A61L2/22—Phase substances, e.g. smokes, aerosols or sprayed or atomised substances
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
  • A61L2/16—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using chemical substances
  • A61L2/18—Liquid substances or solutions comprising solids or dissolved gases
  • A61L2/186—Peroxide solutions
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L9/00—Disinfection, sterilisation or deodorisation of air
  • A61L9/14—Disinfection, sterilisation or deodorisation of air using sprayed or atomised substances including air-liquid contact processes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2202/00—Aspects relating to methods or apparatus for disinfecting or sterilising materials or objects
  • A61L2202/10—Apparatus features
  • A61L2202/14—Means for controlling sterilisation processes, data processing, presentation and storage means, e.g. sensors, controllers, programs
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2202/00—Aspects relating to methods or apparatus for disinfecting or sterilising materials or objects
  • A61L2202/20—Targets to be treated
  • A61L2202/25—Rooms in buildings, passenger compartments

Definitions

• the present invention relates to a treatment method for ensuring decontamination by misting a liquid disinfection product on surfaces to be treated, and in particular on the walls of a room and the various devices and instruments contained therein.
• Misting will be understood to mean an emission of a liquid product whose diffusion will be homogeneous in a given volume in the form of a "dry mist", that is to say not forming any apparent condensation on the surfaces.
• the size of the drops formed is relatively high (of the order of 80 to 200 ⁇ for an air flow rate of 3 to 5 ml of air per minute), so that these drops are deposited by simple effect of gravity on the surfaces close to their place of misting, which, of course, is not satisfactory insofar as the surfaces remote from the fogging injector are free of treatment.
• the present invention aims to provide a method and a treatment apparatus for respecting the integrity of the surfaces with which the treatment liquid is brought into contact, while improving the efficiency of the treatment performed.
• the present invention thus relates to an apparatus for decontaminating a room, comprising means for diffusing a liquid treatment product by misting a given quantity of this treatment liquid in the volume thereof, characterized in that it comprises means for controlling diffusion means capable of interrupting and resuming the misting of said liquid product several times during the same treatment cycle.
• the decontamination apparatus according to the invention:
• - will include means for measuring the concentration of the local atmosphere in a product, said controlled product, which is at least in correlation with the treatment liquid,
• control means of the diffusion means will be able: a) to ensure the misting until a bearing forming a ceiling of concentration of said controlled product is reached in said room, b) to adjust the misting to maintain this level of concentration of said controlled product in the room for a given period between zero and five minutes and preferably close to one minute, c) to stop the misting until a bearing forming a floor of concentration in said controlled product or (d) repeat this cycle until the determined amount of treatment liquid has been dispensed.
• the control means of the diffusion means will achieve the plateau forming the concentration ceiling of said controlled product from concentration values located under said ceiling.
• control means of the diffusion means will make it possible to reach the plateau forming the concentration ceiling of said controlled product from concentration values situated above said ceiling.
• the controlled product will be of the same nature as the treatment liquid; the latter may in particular consist of an aqueous solution of hydrogen peroxide.
• the concentration by weight of the latter may especially be between 3% and 9% and preferably be of the order of 6%.
• the measuring means may comprise at least one sensor capable of measuring the concentration of the atmosphere of the room in said controlled product. They may also comprise at least one sensor for detecting an insufficient quantity of treatment liquid, this sensor being disposed in the room, in particular at a critical zone thereof.
• the apparatus will advantageously comprise means able to communicate with said sensor by a wireless link, in particular of the so-called “bluetooth” type.
• the ceiling concentration of the atmosphere of the room in said controlled product will be between 90% and 97% and will preferably be of the order of 95%. Furthermore, the floor concentration of the room atmosphere in said controlled product will be between 75% and 95% and will preferably be of the order of 90%.
• the measuring means may be arranged on the apparatus, preferably on a part opposite the direction of the ejection of the treatment liquid.
• the present invention also relates to a set of decontamination of a room by misting in the volume thereof of a determined quantity of a liquid treatment product, characterized in that this quantity of treatment liquid is supplied by a set of several devices of the type mentioned above.
• the subject of the present invention is also a method for decontaminating a room by misting the volume thereof with a determined quantity of a liquid treatment product, characterized in that one interrupts and resumes several times the misting of said liquid product during a same treatment cycle.
• this decontamination process will comprise the steps of:
• the duration of maintenance will be zero.
• the controlled product and the treatment liquid will be of the same nature.
• the fogging step in which the concentration of the localization in said treatment product is brought to the ceiling concentration is ensured by performing at least one concentration peak; several of these may form an intermediate bearing.
• FIG. 1 is a schematic view of a room to be decontaminated by means of a device according to the prior state of the art
• FIG. 2 is a schematic diagram showing the concentration of treatment product that exists in the room to be decontaminated during a treatment according to the prior state of the art
• FIG. 3 is a schematic view of a room to be decontaminated by means of an apparatus and the method according to the invention
• FIG. 4 is a schematic and theoretical graph showing the concentration of treatment product in the room to be decontaminated throughout an operation according to the invention
• FIG. 5 is a schematic and theoretical diagram of an alternative embodiment of the invention shown in FIG. 4,
• FIGS. 6 and 7 represent the respective concentrations of hydrogen peroxide and water vapor in a room in which a solution of hydrogen peroxide has been diffused
• FIGS. 8 and 9 are graphs representing throughout a subsequent decontamination operation the invention the concentration of water vapor in the room to be treated which is measured with two sensors located respectively in the center of the room and behind the treatment apparatus.
• FIG. 1 shows a room 1 which it is desired to ensure the decontamination by means of a device 3 according to the prior art, and which is able to diffuse in this room, a liquid treatment product, consisting of in particular an aqueous solution of hydrogen peroxide at a concentration of the order of 6% by weight and with a flow rate of the order of 30 ml / min.
• a liquid treatment product consisting of in particular an aqueous solution of hydrogen peroxide at a concentration of the order of 6% by weight and with a flow rate of the order of 30 ml / min.
• the flow rate of the treatment product is adjusted according to the volume V of the local 1. It can thus be brought, in the case of large volumes of premises, to have in these several treatment devices.
• FIG. 2 shows the curve showing the variation of the hydrogen peroxide content in room 1 during this treatment.
• a second phase forming the stage b during which the treatment product is continuously diffused in the room 1 and during which it condenses on the contact surfaces such as the walls and the various appliances contained therein, a third phase c during which all diffusion is stopped, so that the concentration of hydrogen peroxide decreases gradually.
• alternating diffusion By alternating diffusion will be meant a diffusion which is interrupted and repeated several times during the same treatment cycle so as to form peaks of concentration, which these peaks form steps as shown in FIG. 4, that these peaks are as shown in FIG. 5, whether they are contained completely between bearings forming ceiling values H2 and / or floor H1 as shown in FIG. 8, or that they are only partially contained between these values. as shown in Figures 10 to 13.
• the maximum content of hydrogen peroxide inside the room will be limited to a ceiling value 3 ⁇ 4 slightly less than saturation, that is to say between 90% and 97% and preferably of the order of 95%. %, and this content will be allowed to drop periodically to a floor value H1 in particular of between 75% and 95% and preferably of the order of 90%.
• the misting apparatus 3a comprises means for coupling and servocontrol with at least one detector or sensor 5a able to measure the content in hydrogen peroxide in room 1 during treatment.
• These coupling means can be achieved by a simple wiring or, more conveniently, by means of remote transmission, in particular of the so-called “bluetooth” type.
• the values measured by the sensor 5a are returned to the apparatus 3a where they are processed by a calculation logic unit.
• the misting (part A of the curve) is begun with a flow rate of the order of the one used according to the prior state of the art, namely 30 ml / min, until the hydrogen peroxide content in the room reaches a ceiling value and the control logic decreases the flow of the mist so as to maintain said content at this ceiling value for a time tl (part B of the curve).
• the control logic stops the misting, so that the hydrogen peroxide content in the room 1 decreases (part C of the curve) until the floor value Hi.
• the control logic then ensures the resumption of the misting under the same conditions as the initial misting (part A of the curve).
• the method of diffusion by misting according to the invention makes it possible to avoid any apparent formation of condensation of the treatment liquid on the contact surfaces.
• the optimum value of the holding time t1 for given misting conditions can be determined empirically by reducing it when a condensation comes to be detected on a contact surface. Tests conducted by the Applicant have established that this time is generally between 0 and 5 minutes.
• the time tl maintenance of the local content of treatment product at the ceiling value H 2 can be reduced to zero.
• the control logic will stop the misting until the latter reaches the floor value H1, and then resume it, as represented on the curve of FIG. Figure 5 so as to provide alternating misting.
• the measurement of the concentration of the local product treatment will be effected by means of several probes or measurement sensors 5a, 5b, 5c, which will be distributed in the room to be treated 1, in positions depending on the specific geometry of this- ci, as shown in Figure 3.
• control carried out by means of the measurement probes during the treatment operation may of course relate directly to the atmospheric content of the local of the treatment product itself, but it may also relate to another parameter, provided that it can be correlated with the first.
• the treatment product consists of hydrogen peroxide
• the treatment product consists of hydrogen peroxide
• the substitute product with hydrogen peroxide namely water
• Such an arrangement is particularly advantageous in that it makes it possible to replace sensors that are sensitive to hydrogen peroxide, which are of a high cost and which require constant maintenance by humidity sensors which are in turn costly. much less and require little maintenance.
• various measurement probes can be placed in the room to be treated in places where an average statistical result is obtained, especially in the middle of the room (measuring probe 5a) or, on the contrary, in places where it is believed that the treatment product may have some difficulty in spreading (measuring probe 5c).
• a treatment device that is autonomous, that is to say that has its own measurement probe and does not require the use of satellite probes such as probes 5a and 5c. represented in FIG. 3, at least when the room 1 to be treated is of simple geometrical shape.
• Various processing operations have thus been carried out using two measurement probes, namely a probe 5a arranged at the center of the room and which is coupled by remote connection, for example a so-called connection.
• Bluetooth with the apparatus 3a and a measurement probe 5b disposed behind it and which is not coupled with the apparatus.
• a quantity Q 720 ml of an aqueous solution of hydrogen peroxide at 6% by weight, according to the fogging profile shown in FIG. Figure 8.
• the apparatus was arranged at an angle of the room 1 and the single moisture-sensitive measuring probe 5a was arranged at the center of the room.
• the ceiling H2 has been set at a humidity level of 95% and the floor H1 has been set at a humidity level of 90%. Furthermore the holding time tl was equal to 0, that is to say that from the concentration ceiling H2 reaches the control unit of the device stopped the misting to resume once reached the concentration floor Hl.
• the microbial analyzes showed that on the initial strain of a stock solution of staphylococcus aureus at 3 ⁇ 10 8 cfu / ml (colony-forming units / ml), the reduction of the bacterial load is log 10, thus showing a very effective decontamination which is superior to that obtained in conventional methods according to the prior art.
• the apparatus and method according to the invention can be used essentially in two ways namely on the one hand in a preventative manner and on the other hand in a curative manner which respectively corresponds to a low risk of recontamination and an acute risk of recontamination and this by adjusting the amount of Q treatment liquid issued and broadcast by the device.
• a preventive measure we can adopt an amount of Q 8 ml / m 3 while curative will be adopted a quantity Q of 18 ml / m 3 . It is understood in these conditions that, for a given flow device, the preventive treatment will be faster thus constituting a so-called "short cycle" treatment cycle.
• the present invention thus makes it possible, without creating apparent condensation on the exposed contact surfaces, and consequently without causing corrosion, to diffuse into the room a volume Q of treatment liquid that is much higher than that according to the previous state of the invention. technique, which also increases the efficiency of the treatment.
• the first step of the misting process during which the concentration of the piece in said controlled product is brought to the ceiling concentration H2 can be ensured not continuously as described above. , but by performing one or more concentration peaks PI, P2, as shown in FIG. 10.
• the first step of the process may bring the concentration of the part into said controlled product to a value greater than the plateau consisting of the ceiling H2, ie a value H4. on the face. It can then go down by alternating misting towards the ceiling value H2, either directly or by forming peaks P3 and P4. The subsequent fogging can then continue to proceed alternately between the bearings forming the ceiling values H2 and Hl floor until the end of the treatment cycle.
• the diffusion by misting of the treatment liquid is effected alternately during a treatment cycle, the formation of the liquid pools of the liquid is avoided.
• the latter are the main cause of the degradation phenomena of the walls of the treated volumes and the objects contained therein while improving the quality of the decontamination.

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• Health & Medical Sciences (AREA)
• Epidemiology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Apparatus For Disinfection Or Sterilisation (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (6)

Family Cites Families (8)

• 2009
  • 2009-10-16 FR FR0904972A patent/FR2951379B1/fr not_active Expired - Fee Related
• 2010
  • 2010-10-15 WO PCT/FR2010/000686 patent/WO2011045489A1/fr active Application Filing
  • 2010-10-15 CA CA2777887A patent/CA2777887A1/fr not_active Abandoned
  • 2010-10-15 EP EP10781937A patent/EP2488217A1/de not_active Withdrawn
  • 2010-10-15 US US13/502,305 patent/US20120213666A1/en not_active Abandoned
  • 2010-10-15 AU AU2010306478A patent/AU2010306478A1/en not_active Abandoned

Non-Patent Citations (1)

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