US20170027225A1 - Aerosol-forming member - Google Patents

Aerosol-forming member Download PDF

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Publication number
US20170027225A1
US20170027225A1 US15/115,605 US201515115605A US2017027225A1 US 20170027225 A1 US20170027225 A1 US 20170027225A1 US 201515115605 A US201515115605 A US 201515115605A US 2017027225 A1 US2017027225 A1 US 2017027225A1
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US
United States
Prior art keywords
aerosol
delivery device
forming member
sheet
aerosol delivery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
US15/115,605
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English (en)
Inventor
Helmut Buchberger
Colin John Dickens
Rory FRASER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nicoventures Trading Ltd
Original Assignee
Batmark Ltd
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Filing date
Publication date
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Assigned to BATMARK LIMITED reassignment BATMARK LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FRASER, Rory, BUCHBERGER, HELMUT, DICKENS, COLIN JOHN
Publication of US20170027225A1 publication Critical patent/US20170027225A1/en
Assigned to Nicoventures Trading Limited reassignment Nicoventures Trading Limited ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BATMARK LIMITED
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/42—Cartridges or containers for inhalable precursors
    • A24F47/008—
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/10—Devices using liquid inhalable precursors
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/30—Devices using two or more structurally separated inhalable precursors, e.g. using two liquid precursors in two cartridges
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/44—Wicks
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/46—Shape or structure of electric heating means
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F47/00—Smokers' requisites not otherwise provided for
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/0012—Galenical forms characterised by the site of application
    • A61K9/007—Pulmonary tract; Aromatherapy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M11/00—Sprayers or atomisers specially adapted for therapeutic purposes
    • A61M11/04—Sprayers or atomisers specially adapted for therapeutic purposes operated by the vapour pressure of the liquid to be sprayed or atomised
    • A61M11/041—Sprayers or atomisers specially adapted for therapeutic purposes operated by the vapour pressure of the liquid to be sprayed or atomised using heaters
    • A61M11/042—Sprayers or atomisers specially adapted for therapeutic purposes operated by the vapour pressure of the liquid to be sprayed or atomised using heaters electrical
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M15/00—Inhalators
    • A61M15/06—Inhaling appliances shaped like cigars, cigarettes or pipes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A61M2016/0015—Accessories therefor, e.g. sensors, vibrators, negative pressure inhalation detectors
    • A61M2016/0018—Accessories therefor, e.g. sensors, vibrators, negative pressure inhalation detectors electrical
    • A61M2016/0021—Accessories therefor, e.g. sensors, vibrators, negative pressure inhalation detectors electrical with a proportional output signal, e.g. from a thermistor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A61M2016/0027—Accessories therefor, e.g. sensors, vibrators, negative pressure pressure meter
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/36—General characteristics of the apparatus related to heating or cooling
    • A61M2205/3653—General characteristics of the apparatus related to heating or cooling by Joule effect, i.e. electric resistance
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/82—Internal energy supply devices
    • A61M2205/8206—Internal energy supply devices battery-operated

Definitions

  • the disclosure relates to an aerosol-forming member for an aerosol delivery device.
  • the disclosure also relates to an aerosol delivery device component comprising the aerosol-forming member, and an aerosol delivery device comprising said aerosol delivery device component.
  • An aerosol delivery device is a device used for delivering substances into the body via the lungs.
  • One type of aerosol delivery device forms a vapor of a solution in which the substances are dissolved. This vapor condenses within the aerosol delivery device as it mixes with air so as to form droplets or aerosol which is suitable for inhalation.
  • These aerosol delivery devices may comprise a heating element that is configured to evaporate the solution held within the aerosol delivery device so as to form said aerosol.
  • some aerosol delivery devices may utilize piezo atomizers to generate the aerosol.
  • an aerosol-forming member comprising a sheet of material configured to heat and wick a solution, wherein the sheet of material comprises at least one corrugation.
  • the sheet of material may comprise a capillary structure configured to wick a solution.
  • the capillary structure may be exposed on both sides of the sheet of material.
  • the capillary structure may extend throughout the whole sheet of material.
  • the sheet of material may be heatable.
  • the capillary structure may be made of an (electrically) heatable material.
  • the sheet of material may comprise a first layer that is heatable and a second layer comprising a capillary structure.
  • the sheet of material may comprise a peak and a trough, with said peaks/troughs being either rounded or pointed, i.e. where the sheet of material includes corrugations forming vertices.
  • the sheet of material may have a wave form.
  • an aerosol delivery device component comprising an air inlet and an air outlet fluidly communicating via an aerosol chamber defined by chamber walls, and an aerosol-forming member as described above, the aerosol forming member being located at least partially within the aerosol chamber.
  • the aerosol delivery device component may further comprise an aerosol-forming member located completely in the aerosol chamber.
  • the sheet of material may comprise two opposing major surfaces that are aligned with a direction of flow of air through the aerosol chamber.
  • the sheet of material may comprise two opposing ends that are attached to the aerosol delivery device component such that the sheet of material is suspended across the aerosol chamber.
  • the aerosol forming member may be attached to at least one of the chamber walls.
  • one of the chamber walls is a printed circuit board and the aerosol-forming member is attached to the printed circuit board.
  • the at least one corrugation of the sheet of material may be in close proximity to at least one of the chamber walls.
  • the at least one corrugation of the sheet of material may be in contact with at least one of the chamber walls.
  • At least one of the chamber walls may comprise a heat shield.
  • an aerosol delivery device component comprising an air inlet and an air outlet fluidly communicating via an aerosol chamber defined by chamber walls, wherein at least one of the chamber walls comprises a liquid reservoir matrix.
  • the liquid reservoir matrix may comprise a capillary structure.
  • the liquid reservoir matrix may comprise a heat resistant layer and a resilient layer.
  • two opposing chamber walls may each comprise a liquid reservoir matrix, and the heat resistant layer of each liquid reservoir matrix is innermost relative to the aerosol chamber such that the resilient layer urges the heat resistant layers towards one another.
  • the aerosol delivery device component may further comprise an aerosol-forming member located at least partially within the aerosol chamber. In one embodiment, the aerosol delivery device component may further comprise an aerosol-forming member located completely within the aerosol chamber.
  • the aerosol-forming member may comprise any of the features described above.
  • the at least one corrugation of the sheet of material may be in contact with the liquid reservoir matrix.
  • an aerosol delivery device comprising an aerosol delivery device component and/or aerosol forming member as described above.
  • an aerosol-forming member comprising a sheet of material configured to heat and wick a solution, wherein the sheet of material has a cross-sectional profile having at least one point of inflection.
  • FIG. 1 a shows a cross-sectional side view of an aerosol delivery device comprising an aerosol-forming member according to an embodiment.
  • FIG. 1 b shows a cross-sectional side view of an alternative aerosol delivery device comprising an aerosol-forming member according to an embodiment.
  • FIG. 2 a shows a cross-sectional side view of a detachable component, which may be used in the device of FIG. 1 a , comprising an aerosol-forming member according to an embodiment.
  • FIG. 2 b shows a cross-sectional view of the aerosol delivery device along the line X-X of FIG. 2 a.
  • FIG. 2 c shows a cross-sectional view of the aerosol delivery device along the line X-X of FIG. 1 b.
  • FIG. 3 a shows a cross-sectional view of another embodiment of the aerosol delivery device.
  • FIG. 3 b shows a cross-sectional view of another embodiment of the aerosol delivery device.
  • an aerosol delivery device 1 according to an embodiment is disclosed.
  • the aerosol delivery device comprises an aerosol delivery device component 1 ′, and an energy store component 1 ′′.
  • the aerosol delivery device component 1 ′ is removably attachable to the energy store component 1 ′′, however it is envisaged that in an alternative embodiment, the aerosol delivery device component 1 ′ and the energy store component 1 ′′ are inseparable such that they form a single component.
  • the aerosol delivery device component 1 ′ may be disposable and the energy store component 1 ′′ may be reusable. However, it is envisaged that when the two components are formed as a single component then the aerosol delivery device may be disposable or reusable.
  • the energy source component 1 ′′ comprises a housing holding a battery 30 and an electric circuitry 31 as shown in FIG. 1 a . It should be appreciated that an alternative power source to a battery may be used.
  • the aerosol delivery device component 1 ′ is shown in greater detail in FIG. 2 a and it comprises a housing 2 formed with a mouthpiece 3 at one end and an attachment end formed with a connecting passage 35 at the opposite end.
  • the connecting passage 35 electrically connects components held in the aerosol delivery device component 1 ′ with the battery 15 disposed in the energy store component 1 ′′ via the electric circuitry 31 (not shown).
  • the housing 2 is further formed with an air passage extending through the aerosol delivery device component 1 ′.
  • the air passage comprises an air inlet 5 , plenum chamber 4 , chamber inlet 33 , aerosol chamber 6 , chamber outlet 28 and outlet aperture 7 .
  • air is drawn in through the air inlet 5 , into the plenum chamber 4 , then to the chamber inlet 33 which supplies the air into the aerosol chamber 6 , the air then exits the aerosol chamber 6 via chamber outlet 28 and leaves the aerosol delivery device component 1 ′ via the outlet aperture 7 formed in the mouthpiece 3 .
  • FIG. 2 b illustrates a cross-sectional view of the aerosol delivery device component 1 ′ along line X-X shown in FIG. 2 a .
  • the aerosol chamber 6 is located in the center of the housing and is defined by chamber walls.
  • the chamber walls comprise two partitioning walls 8 , a chamber side wall 32 and a support plate 20 ′ as explained in more detail below.
  • An aerosol-forming member 10 A according to an embodiment is located in the aerosol chamber 6 .
  • On opposite sides of each partitioning walls 8 relative to the aerosol chamber 6 are two solution reservoirs 9 configured to contain a solution.
  • the support plate 20 ′ is the PCB.
  • the support plate 20 ′ is integrated with the housing 2 such that a capillary gap is formed between the housing and the partitioning wall 8 .
  • the aerosol-forming member 10 A may comprise a sheet of material having a single layer that is configured to wick and heat a solution.
  • the sheet of material can absorb solution from the solution reservoirs 9 and thereafter heat it up so that it evaporates and forms a vapor.
  • the sheet of material is sheet-like in nature.
  • the sheet of material may comprise an open-pored structure, foam structure, mesh structure or interconnecting network of pores, all of which form a capillary structure.
  • the capillary structure enables the aerosol-forming member 10 A to wick or absorb a solution.
  • capillary structure used herein is to be understood as a structure through which liquid or a solution can travel as a result of capillary action.
  • FIG. 1 b An embodiment of an alternative aerosol delivery device 1 is shown in FIG. 1 b and it comprises a housing 2 with a mouthpiece 3 .
  • a passage 4 is provided in the housing 2 and is open to atmosphere via an air inlet 5 .
  • the passage 4 is in fluid communication with an aerosol chamber 6 which in turn is in fluid communication with an outlet aperture 7 formed in the mouthpiece 3 . Therefore, in use, air may be drawn through the air inlet 5 and into the aerosol chamber 6 , via the passage 4 , and then through the outlet aperture 7 as is indicated by the arrows in FIG. 1 .
  • FIG. 2 c shows a cross-sectional view of the aerosol delivery device 1 of FIG. 1 b
  • a space is provided inside the housing 2 which is divided by a partitioning wall 8 into the aerosol chamber 6 and a liquid reservoir 9 that contains a solution.
  • the aerosol chamber 6 is defined by the partitioning wall 8 , a support plate 19 and a heat shield 26 .
  • the partitioning wall 8 , support plate 19 and heat shield 26 act as chamber walls.
  • Two capillary gaps 17 , 18 are formed between the ends 20 , 21 of the partitioning wall 8 and the support plate 19 .
  • the device shown in FIG. 1 may also include a similar heat shield as necessary.
  • the support plate 19 is the PCB.
  • the support plate 19 is integrated with the housing 2 such that a capillary gap is formed between the housing and the partitioning wall 8 .
  • An aerosol-forming member 10 a is located in the aerosol chamber 6 as seen in FIG. 2 b or 2 c .
  • the aerosol-forming member 10 a comprises a sheet of configured to have corrugations 10 b such that it comprises peaks and troughs.
  • a corrugation is to be understood as two bends, or a peak and a trough, or a ridge and a groove.
  • the sheet of material may also be described as having a cross-sectional profile comprising at least one point of inflection.
  • the corrugations of the aerosol-forming members 10 a may follow a meandering or oscillating path, or a sine curve or any other similar pattern.
  • the aerosol-forming member 10 a may comprise regular corrugations such that it comprises a repetition of identical corrugations as seen in FIG. 2 .
  • the aerosol-forming member may comprise irregular corrugations wherein the shape of the peaks and troughs differ from one another.
  • FIGS. 2 a and 2 b show an aerosol-forming member 10 a comprising rounded corrugations 10 b , i.e.
  • the sheet of material may comprise a single layer that is sheet-like in nature and comprises two major opposing surfaces 13 , 14 and two opposing ends 15 , 16 .
  • the two opposing ends 15 , 16 are attached to a support plate 19 (according to the device of FIG. 1 b ) or support plate 20 ′ (according to the device of FIG. 1 a ) such that they locate in corresponding capillary gaps 17 , 18 formed between the support plate 19 , 20 ′ and the ends 21 , 20 (according to the device of FIG. 1 b ) of the partitioning wall 8 .
  • the two opposing ends 15 , 16 are also electrically connected to the support plate 19 .
  • the support plate 19 may be a printed circuit board (PCB).
  • the sheet of material is configured to extend in a contact-free manner across the aerosol chamber 6 such that the aerosol-forming member 10 a is suspended across the aerosol chamber 6 and only the ends 15 , 16 of the aerosol-forming member 10 a are in contact with the chamber walls of the aerosol chamber 6 .
  • This configuration reduces undesired loss in heat conduction of the aerosol-forming member 10 a .
  • the aerosol-forming member 10 a can heat up faster to a sufficient temperature wherein a solution held in the aerosol-forming member evaporates than if the aerosol-forming member was in continuous contact with the chamber walls.
  • the sheet of material does not have to be a single layer, but can be a sheet of multiple layers of the same or different material that are layered/laminated/attached so as to form the final sheet-like material.
  • the aerosol-forming member 10 a has corrugations such that it extends substantially across the entire cross-section of the aerosol chamber 6 as seen in FIGS. 2 b,c and 3 a,b . More specifically, the aerosol-forming member 10 a does not only extend in a direction between the capillary gaps 17 , 18 , but also extends across substantially the whole distance between the support plate 19 and the partitioning wall 8 /heat shield 26 (according to the embodiment of FIG. 2 c ), and across substantially the whole distance between the support plate 20 ′ and the chamber wall 32 /heat shield 26 (according to the embodiment of FIG. 2 b ).
  • the corrugations 10 b are adjacent or in close proximity to the chamber walls, or more specifically the wall 8 , 32 , the heat shield 26 and the support plate 19 , 20 ′.
  • the aerosol-forming member 10 a extends across the aerosol chamber 6 to such an extent that the corrugations 10 b contact or engage with the chamber walls (as shown in FIGS. 3 a and 3 b ).
  • the depth of the corrugations 10 b is shorter such that the aerosol-forming member 10 a does not extend across the whole distance between the support plate 19 and the partitioning wall 8 /heat shield 26 (according to the embodiment of FIG.
  • each of the corrugations 10 b contact or be in close proximity with the chamber walls.
  • each corrugation may be independently configured to either be in contact with the chamber walls, be in close proximity with the chamber walls, or to be distanced from the chamber walls.
  • the sheet of material which may comprise a single layer, is configured to wick and heat a solution such that the sheet of material can absorb solution and thereafter heat it up such that it evaporates and forms a vapor.
  • the sheet of material may comprise an open-pored structure, foam structure or interconnecting network of pores, all of which form a capillary structure.
  • the capillary structure enables the aerosol-forming member 10 a to wick or absorb a solution.
  • capillary structure used herein is to be understood as a structure through which liquid or a solution can travel as a result of capillary action.
  • the aerosol-forming member 10 a may be made of a porous granular, fibrous or flocculent sintered metal(s) so as to form said capillary structure.
  • the aerosol-forming member 10 a comprises an open-pored metallic foam or a group of layers of wire mesh or calendered wire mesh or wire fabric which also forms a capillary structure.
  • the aerosol-forming member 10 a may be formed from stainless steel, e.g. AISI 304 or 316, or from a heating conductor alloy, like nickel chromium alloys.
  • the aerosol forming member 10 a may be formed with a capillary structure that extends throughout the whole aerosol-forming member 10 a such that it is exposed on the two major surfaces 13 , 14 of the sheet of material. In this embodiment each of the major surfaces would be exposed to the chamber 6 .
  • one of the major surfaces 13 , 14 may optionally be sealed with a metallic foil or cover that is sintered or attached to said major surface such that said surface is vapor impermeable.
  • a region of one or both of the major surfaces 13 , 14 may be sealed so as to be vapor impermeable.
  • the aerosol-forming member 10 a is configured such that the capillary structure does not extend throughout the whole aerosol-forming member.
  • the capillary structure does not extend to one of the major surfaces 13 , 14 such that there is no exposed capillary structure in this area.
  • the capillary structure is exposed on a region of one or both major surfaces 13 , 14 .
  • reference to “exposure” of the capillary surface does so with reference to the chamber 6 and it is possible that there are areas of the capillary surface that extend to the major surfaces 13 , 14 but that are covered by other components of the device.
  • a thin support layer may be attached to one or both of the major surfaces 13 , 14 .
  • a support layer provides stability to the sheet of material.
  • the support layer may be formed from a wire mesh or from individual wires and may be made of stainless steel.
  • the material from which the aerosol-forming member 10 a is formed is heatable in that it comprises sufficient electrical resistivity so that when current is passed through, the aerosol-forming member 10 a heats up to a temperature sufficient to cause the solution held in the capillary structure to evaporate or vaporize.
  • the aerosol-forming member 10 a can be considered to comprise a heating element formed with a capillary structure such that the heating element and the capillary structure are integrated and form a single entity or unit.
  • the sheet of material comprises a single layer configured to wick and heat a solution
  • the sheet of material can be described as comprising a heating element and a wick that are arranged in the same surface.
  • the sheet of material may comprise a plurality of layers, for example it may comprise any combination of the aforementioned structures and materials, e.g. by providing multiple layers of different structures/materials, the layers being joined together, e.g. by sintering.
  • a plurality of layers for example it may comprise any combination of the aforementioned structures and materials, e.g. by providing multiple layers of different structures/materials, the layers being joined together, e.g. by sintering.
  • This un-illustrated alternative aerosol-forming member comprises a sheet of material that is sheet-like in nature and formed from a plurality of layers.
  • the aerosol-forming member 10 a may comprise a first heatable layer acting as a heating element.
  • the first layer is formed from a material that is configured to be heated up and may comprise a metal wire mesh, it may be made of stainless steel or nickel chromium alloys.
  • the aerosol-forming member 10 a may further comprise a second layer formed with an open-pored structure, foam structure or interconnecting network of pores, all of which form a capillary structure.
  • the capillary structure enables the aerosol-forming member 10 a to wick or absorb a solution.
  • This second layer may comprise a fiber web or fabric made of glass fibers, glass fiber yarns or any other non-conductive and inert, thus relatively non-heatable (electrically non-heatable) fiber materials.
  • the sheet of material can be described as comprising a heating element and a wick that are arranged in parallel surfaces and are connected to each other. The second layer acts as a wick.
  • the first layer (heating element) and the second layer (wick formed with a capillary structure) are laid on top of each other so as to form a sheet of material having two opposing major surfaces, wherein the capillary structure is exposed on one or both major surfaces (depending on the configuration of the heating element).
  • the sheet of material comprises a third layer that is similar to the second layer in that it comprises a capillary structure.
  • the second and the third layer sandwich the first layer such that the capillary structure is exposed on both major surfaces of the sheet of material.
  • the first layer forming the heating element and the second and/or third layer(s) forming the wick are parallel and connected to each other.
  • the layers may be connected to each other by mechanical, chemical or thermal means.
  • the layers are sintered or fritted to one another.
  • both the first and the second layers may be made of a heatable material.
  • the first layer may comprise a metal foil
  • the second layer may be made of a porous granular, fibrous or flocculent sintered metal(s) or comprise an open-pored metallic foam or a wire mesh structure all of which form said capillary structure.
  • the first and second layers may be formed from stainless steel and may be sintered together.
  • the sheet of material can be described as comprising a heating element and a wick that are arranged in the same surface and in parallel surfaces, the capillary structure being only exposed on one of the major surfaces of the sheet of material.
  • the first and second layers may be made of porous heatable material(s), such that both layers are configured to heat and wick a solution.
  • the sheet of material can be described as comprising a heating element and a wick that are arranged in the same surface and in parallel surfaces.
  • the sheet of material comprises a porous first layer having small sized pores and a second porous layer having larger sized pores than the first layer, thus both layers are formed with a capillary structure however the second layer forming the inner major surface can emit more vapor than the first layer forming the outer major surface.
  • At least one of the two layers is formed from a heatable material as described above. Both layers may be formed with a structure and material as discussed above in relation to the capillary structure.
  • the sheet of material according to any of the above described embodiments has a thickness or depth that falls within the range of 20-500 ⁇ m. Alternatively, the thickness falls within the range of 50 to 200 ⁇ m.
  • the thickness or depth should be understood as meaning the distance between the two major surfaces 13 , 14 of the sheet of material.
  • the ends 21 , 20 of the partitioning wall 8 are formed with two supply passages 22 such that the reservoir 9 and capillary gaps 17 , 18 are in fluid communication.
  • the supply passages are of a width sufficient to achieve a capillary effect. Therefore, in use, a solution held in the reservoir 9 moves by capillary action from the fluid reservoir 9 into the supply passages 22 towards the capillary gaps 17 , 18 , and then from the capillary gaps 17 , 18 to the capillary structure at the ends 15 , 16 of the aerosol-forming member 10 a .
  • the capillary structure of the aerosol-forming member 10 a provides a capillary effect similar to a wick, thus the capillary structure enables the aerosol-forming member 10 a to absorb the solution provided to the capillary gaps 17 , 18 such that the solution is distributed throughout the whole capillary structure of the sheet of material.
  • FIG. 2 b operates in a similar manner, except the aerosol-forming member 10 a is fed from reservoir 9 via capillary gaps 17 , 18 .
  • the present disclosure is not limited to two capillary gaps 17 , 18 , but may comprise only a single capillary gap feeding only one of the ends 15 , 16 of the aerosol-forming member 10 a.
  • a battery 30 controlled by a controller forming part of a printed circuit board (PCB) is disposed in the housing 2 as seen in FIG. 1 , and the ends 15 , 16 of the aerosol-forming member 10 a are electrically connected, e.g. via circuitry, to the positive and negative terminals of the battery 30 respectively.
  • PCB printed circuit board
  • the sheet of material comprises a non-porous heatable first layer, for instance a metal foil, and where the outer major surface is formed from said first layer
  • the resistance of said first layer causes the first layer acting as a heating element to increase in temperature, the first layer in turn heating up adjacent second and/or third layers including the solution contained/stored in the pores/void of the capillary structure of said second and/or third layers.
  • the current drawn by the battery 30 and thus the temperature of the sheet of material may be controlled by a switching circuit, e.g. a Power-MOSFET switching circuit, within the housing 2 .
  • the switching circuit may provide automatic control of the temperature, for example, by using temperature sensors (not shown), or may be controlled by a button or dial (not shown) provided on the housing 2 that may be manipulated by the user.
  • the partitioning wall 8 may be provided with a heat shield 26 on a surface facing the aerosol-forming member 10 a .
  • the heat shield 26 is shown in FIG. 2 b and it protects the partitioning wall 8 from overheating as the temperature of the aerosol-forming member 10 a is increased.
  • the heat shield 26 may be formed from a thin non-conductive material like oxidized stainless steel wire mesh or inert fabrics like glass or carbon fabrics. It should be understood that the heat shield 26 is optional.
  • the user may manually activate the aerosol delivery device 1 or the aerosol delivery device 1 may be activated automatically as the user starts puffing on the aerosol delivery device 1 .
  • This may be achieved by a pressure sensor (not shown) included in the electric circuitry 31 and communicating with the inlet passage/plenum chamber 4 via a connecting passage.
  • the battery 30 provides a potential difference between the opposing ends 15 , 16 of the aerosol-forming member 10 a as the aerosol delivery device is activated, causing current to flow though the sheet of material such that the member 10 a increases in temperature.
  • This increase in temperature causes the solution held in the capillary structure of the sheet of material to evaporate so as to form a vapor.
  • the evaporated solution mixes with the air drawn into the aerosol delivery device via passage 4 by the user.
  • the evaporated solution mixes with air in the aerosol chamber 6 , and as this occurs the vapor condenses and forms droplets such that an inhalable aerosol is produced.
  • the aerosol-forming member is located in the housing 2 such that the planes of the major surfaces 13 , 14 are parallel to or substantially aligned with the direction of the airflow through the aerosol chamber 6 .
  • the solution evaporates in a direction transverse to the direction of the airflow.
  • the solution is evaporated from both sides in opposite directions.
  • the corrugations 10 b of the sheet of material form channels 25 through which air flows and also in which a solution is evaporated such that when it mixes with airflow aerosol is formed.
  • the corrugations 10 b or channels 25 direct the flow of aerosol through the aerosol delivery device towards the user. Furthermore, as a result of the corrugations 10 b , solution is evaporated from the major surfaces 13 , 14 in a direction towards another region of the major surfaces 13 , 14 which results in reduced levels of aerosol condensing on the chamber walls and other internal components. Furthermore, as vapor is emitted from the major surfaces 13 , 14 towards another region of the same major surface, vapor density is increased.
  • the corrugated configuration reduces condensation from forming and accumulating on the chamber walls, internal components and/or inner walls of the housing 2 .
  • sponges or other means for absorbing condensation not inhaled by the user that are used in some conventional aerosol delivery devices may be omitted.
  • the transfer of condensation heat to the housing 2 may be reduced, making the aerosol delivery device 1 more comfortable for the user to hold.
  • the aerosol-forming member 10 a After the aerosol-forming member 10 a has been activated and aerosol has formed in the channels 25 , the aerosol is drawn through the channels 25 as the user continues to inhale. The aerosol then exits the aerosol chamber 6 through a chamber outlet 31 provided in the housing 2 as seen in FIG. 1 b . The aerosol then passes through an optional aerosol refining member 32 provided in the housing 2 , causing the aerosol to be cooled.
  • the refining member 32 may also contain flavoring agents like menthol that are released into the flow of aerosol before entering the user's mouth via the outlet 7 provided in the mouthpiece 3 .
  • a pressure drop element/flow resistor 33 is positioned in the passage 4 so that the flow of air into the aerosol chamber 6 can be controlled.
  • the flow resistor 33 may consist of a simple aperture or hole and may be identical with the air inlet 5 in the housing 2 .
  • the flow resistor 33 may consist of a porous body similar to a cigarette filter providing the flow resistance of a conventional cigarette.
  • the valve 33 may be controlled by the PCB or manually, for example, by adjusting a switch or dial (not shown) on the housing 2 of the aerosol delivery device 1 .
  • the degree of corrugation can be varied by varying the number of corrugations per distance unit.
  • the sheet of material comprises three corrugations per distance unit.
  • the sheet of material comprises 6 corrugations per distance unit. The greater the degree of corrugation the more aerosol is generated by the aerosol-forming member per inhalation.
  • the aerosol-forming member has larger surface area compared to a flat aerosol-forming member.
  • this increases the efficiency of the aerosol forming member 10 a in that it can produce more aerosol per inhalation.
  • the aerosol delivery device 1 can be made more compact.
  • FIG. 3 a shows a cross-section of an aerosol delivery device 51 similar to the aerosol delivery device 1 shown in FIG. 1 a .
  • the aerosol delivery device 51 comprises a housing 52 with a mouthpiece (not shown).
  • a passage (not shown) is provided in the housing 52 and is open to atmosphere via an air inlet (not shown).
  • the passage is in fluid communication with an aerosol chamber 56 which in turn is in fluid communication with an outlet aperture (not shown) formed in the mouthpiece. Therefore, in use, air may be drawn through the passage and into the aerosol chamber 56 , via the passage, and then through the outlet aperture similar to the airflow of the aerosol delivery device shown in FIG. 1 a.
  • An aerosol-forming member 60 a is located in the aerosol chamber 56 as seen in FIG. 3 a .
  • the aerosol-forming member 60 a comprises a sheet of material having corrugations 60 b such that it forms peaks and troughs.
  • a corrugation is to be understood as two bends, or a peak and a trough, or a ridge and a groove.
  • the sheet of material may also be described as having a cross-sectional profile comprising at least one point of inflection.
  • the corrugations may follow a meandering or oscillating path, or a sine curve, or a zigzag-like configuration, or any other similar pattern.
  • the aerosol-forming member 60 a may comprise regular corrugations such that it comprises a repetition of identical corrugations as seen in FIG. 3 a .
  • the aerosol-forming member may comprise irregular corrugations wherein the shape of peaks and troughs differ from one another.
  • FIG. 3 a shows an aerosol-forming member 60 a comprising rounded corrugations 60 b , i.e. rounded peaks and troughs, it should be understood that the disclosure is not limited thereto, but also includes corrugations forming vertices. These vertices may have obtuse, acute and/or right angles.
  • This embodiment is shown in FIG. 3 b and the reference numerals of FIG. 3 a apply correspondingly to the components of FIG. 3 b.
  • the aerosol-forming member 60 a is similar to the embodiments of the aerosol-forming member 10 a described above with reference to FIGS. 1 and 2 and so a detailed description will be omitted. However, it should be understood that the aerosol-forming member 60 a comprises a sheet material having two opposing major surfaces 66 , 67 .
  • the aerosol-forming member 60 a has an open-pored structure, foam structure or interconnecting network of pores, all of which form a capillary structure.
  • the capillary structure enables the aerosol-forming member 60 a to wick or absorb a solution.
  • the sheet of material may comprise a single or a plurality of layers according to the various embodiments described with reference to FIG. 2 .
  • the aerosol chamber 56 is defined by chamber walls comprising two opposing chamber side walls 53 , 54 and two opposing chamber main walls 57 a , 57 b .
  • the chamber main walls 57 a , 57 b comprise a liquid reservoir matrix 58 , 59 .
  • the liquid reservoir matrix 58 , 59 comprises a capillary structure, for example an interconnecting porous or open-porous structure, such that it can hold a solution or liquid.
  • the liquid reservoir matrix 58 , 59 comprises a heat resistant layer 62 and a resilient layer 63 .
  • each chamber main wall 57 a , 57 b is exposed to the space of the aerosol chamber 56 and the resilient layer of each main wall 57 a , 57 b is sandwiched between the heat resistant layer 62 and the housing 52 .
  • the heat resistant layer 62 is sheet-like in nature and comprises one or a plurality of layers that may have a structure of fabric, mesh, woven fiber web, non-woven fiber web or foam.
  • the heat resistant layer 62 is made of a heat resistant material, for example, glass, metal, carbon-based materials, ceramic, cotton or heat resistant plastic. If the heat resistant layer 62 is made of metal, the metal may be coated or oxidized so as to prevent short circuits.
  • the heat resistant layer 62 is configured to resist heat so that it can withstand heat emitted by the aerosol forming member 60 a and thereby protect the resilient layer 63 .
  • the resilient layer 63 may comprise various structures, for example, its structure may be formed from woven fibers, non-woven fibers, foam or sponge.
  • the resilient layer 63 may be made of plastic.
  • the resilient layer 63 provides a spring force such that it urges or biases the heat resistant layer 62 towards the corrugations 60 b , i.e. the peaks, troughs or vertices, such that the heat resistant layer 62 of each liquid reservoir matrix 58 , 59 is in contact with the corrugations, i.e. the peaks, troughs or vertices.
  • This enables the liquid reservoir matrices 58 , 59 to supply solution held therein to the aerosol-forming member 60 a such that the solution spreads throughout the capillary structure of the aerosol-forming member 60 a.
  • the capillarity of the aerosol-forming member 60 a may be greater than the capillarity of the reservoir matrices 58 , 59 , but at least greater than the capillarity of the resilient layer 63 so as to induce a flow of solution from the liquid reservoir matrices 58 , 59 towards the aerosol-forming member 60 a .
  • the capillarity is defined by the pore size and the wetting conditions of the respective capillary structures.
  • the present disclosure is not limited to comprising two liquid reservoir matrices 58 , 59 . It may comprise more than two liquid reservoir matrices. For example, each peak and trough of a corrugation may be in contact with discrete liquid reservoir matrices.
  • only one chamber main wall 57 a comprises a liquid reservoir matrix and the other chamber main wall 57 b is made of a non-porous material (vice versa).
  • Ends 64 , 65 of the aerosol-forming member 60 a are attached to the chamber side walls 53 , 54 .
  • both ends 64 , 65 of the aerosol-forming member 60 a are attached and can be electrically connected to a support plate, which may be a printed circuit board (PCB).
  • a support plate which may be a printed circuit board (PCB).
  • ends of the aerosol-forming member 60 a may be attached to one of the heat resistant layers 62 of the chamber main walls 57 a , 57 b as seen in FIG. 3 .
  • the aerosol-forming member 60 a is suspended across the aerosol chamber 56 .
  • the aerosol-delivery device 51 further comprises a battery (not shown) and a printed circuit board (PCB) (not shown) as described with reference to FIGS. 1 and 2 , and the aerosol-delivery device 51 is configured similar to the aerosol delivery device 1 described with reference to FIGS. 1 and 2 such that the ends 64 , 65 of the aerosol-forming member 60 a , are electrically connected to the positive and negative terminals of the battery respectively.
  • the resistance of the sheet of material causes it to increase in temperature.
  • the user may manually activates the aerosol delivery device 51 or the aerosol delivery device 51 may be activated automatically as the user starts puffing on the aerosol delivery device 51 .
  • This may be achieved by a pressure sensor (not shown) located in the passage extending between the air inlet and aerosol chamber.
  • the battery provides a potential difference between the ends 64 , 65 of the aerosol-forming member 60 a as the aerosol delivery device 51 is activated, causing current to flow between the ends 64 , 65 such that the sheet of material increases in temperature.
  • This increase in temperature causes the solution held in the capillary structure of the sheet of material to evaporate so as to form a vapor.
  • the vapor mixes with air drawn into the aerosol delivery device via passage by the user.
  • the vapor mixes with air in the aerosol chamber 56 , and as this occurs the vapor condenses and forms droplets such that an inhalable aerosol is produced.
  • the aerosol-forming member according to any of the above described embodiments with reference to FIG. 3 is located in the housing 52 such that the planes of the major surfaces 66 , 67 are substantially parallel or aligned with the direction of the airflow.
  • the solution evaporates in a direction transverse to the direction of the airflow.
  • the solution is evaporated from both sides in opposite directions.
  • the corrugations 60 b of the sheet of material form channels 68 through which air flows. Furthermore, evaporated solution or vapor mixes with the airflow in the channels 68 such that aerosol is formed.
  • the corrugations 60 b or channels 68 direct the flow of aerosol through the aerosol delivery device 51 towards the user. Furthermore, as the sheet of material comprises corrugations solution is evaporated from the major surfaces 66 , 67 in a direction towards another region of the major surfaces which results in reduced levels of aerosol condensing on the chamber walls and other internal components. Furthermore, as the aerosol-forming member 60 a cools down aerosol and vapor remaining in the aerosol chamber 56 that condenses onto one of the major surfaces 66 , 67 will be reabsorbed into the capillary structure of the aerosol-forming member 60 a and re-evaporated as the aerosol-forming member 60 a heats up again. Condensate formed on the chamber walls may at least partially be reabsorbed into the capillary structure of the heat resistant layer 62 and that way resupplied to the capillary structure of the aerosol-forming member 60 a.
  • the corrugated configuration of the aerosol-forming member 60 b shown in FIG. 3 also reduces condensation from forming on the chamber walls, internal components and/or inner walls of the housing 52 .
  • separate sponges other than the liquid reservoir matrices 58 , 59 or other extra means for absorbing condensation not inhaled by the user that are used in some conventional aerosol delivery devices may be omitted.
  • the transfer of condensation heat to the housing 52 may be reduced, making the aerosol delivery device 51 more comfortable for the user to hold.
  • the aerosol-forming member 60 a After the aerosol-forming member 60 a has been activated and aerosol has formed in the channels 68 , the aerosol is drawn through the channels 68 as the user continues to inhale. The aerosol then exits the aerosol chamber 56 through a chamber outlet provided in the housing 52 . The aerosol then passes through an optional filter sponge provided in the housing 52 , causing any large particulate in the flow to condense and be removed from the air flow before entering the user's mouth via the outlet provided in the mouthpiece.
  • a flow resistor (as described above) is positioned in the passage so that the flow of air into the aerosol chamber 56 can be controlled.
  • the valve may be controlled by the PCB or manually, for example, by adjusting a switch or dial (not shown) on the housing 52 of the aerosol delivery device 51 .
  • the aerosol-forming member has larger surface area compared to a flat aerosol-forming member.
  • this increases the efficiency of the aerosol forming member 10 a in that it can produce more aerosol per inhalation.
  • the aerosol delivery device 51 can be made more compact.
  • the degree of corrugation of the aerosol-forming member 60 a can be changed as described with reference to FIG. 2 .
  • one or both of the ends 15 , 16 , 64 , 65 may be located in line with or off-set from the peaks, troughs or vertices of the corrugations 10 b , 60 b.
  • the aerosol-forming member or device there may be multiple aerosol-forming members, e.g. two, three, four, five or six aerosol-forming members.
  • the number and configuration of the corrugations on each of the aerosol forming members may be the same or different.
  • the aerosol-forming members may be positioned in the aerosol-forming component or device such that the corrugations are aligned.
  • the multiple aerosol-forming members contain a different number and/or configuration of corrugations, the corrugations that are present may still be aligned.
  • a first aerosol-forming member may be aligned with three corrugations of a second aerosol forming member.
  • Such a configuration would result in the channels 25 , 68 being maintained throughout the aerosol chamber.
  • the multiple aerosol-forming members may be positioned in the aerosol-forming component or device such that the corrugations are offset. This may result in better mixing conditions between the vapor and the air and increased aerosol yields.
  • the multiple aerosol forming members may be electrically connected in series or in parallel.
  • the multiple aerosol forming members may be controlled differently, e.g. heated up sequentially.
  • this solution may comprise certain constituents or substances that may have a stimulatory effect on the user. These constituents or substances may be of any kind that is suitable for being delivered via inhalation.
  • the solution in which the constituents or substances are held or dissolved may primarily consist of water, ethanol, glycerol, propylene glycol or mixtures of the aforementioned solvents.

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GBGB1401520.0A GB201401520D0 (en) 2014-01-29 2014-01-29 Aerosol-forming member
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