Aerosol Delivery Devices / Systems

Abstract

The present disclosure relates to an aerosol delivery system, such as a smoking replacement system. In particular, the present disclosure relates to an aerosol generation system, comprising: an vaporizer; an airflow sensor configured to detect an inhalation by a user from the system; and a controller, the controller configured to activate the vaporizer only when the duration of the inhalation by the user exceeds a predefined duration threshold.

Description

[Technical field]

[0001] The present disclosure relates to aerosol generation / delivery systems, such as smoking replacement systems. [Background technology]

[0002] Tobacco smoking is generally considered to expose the smoker to potentially harmful substances, which are generally believed to be produced in significant quantities through the heat caused by burning and / or combusting tobacco, as well as through the burnt tobacco components contained in the tobacco smoke itself.

[0003] The combustion of organic materials such as tobacco is known to produce tar and other potentially harmful by-products. To avoid smoking tobacco, various smoking alternative systems have been proposed.

[0004] Such smoking replacement systems can form part of a nicotine replacement therapy regimen for people who wish to quit smoking and overcome their dependence on nicotine.

[0005] Smoking replacement systems, sometimes referred to as electronic nicotine delivery systems, may comprise electronic systems that allow a user to mimic the act of smoking by creating an aerosol, also called "vapor," which is drawn into the lungs (inhaled) through the mouth and then exhaled. The inhaled aerosol typically contains nicotine and / or flavorings, without or with little of the odor and health risks associated with traditional smoking.

[0006] Generally speaking, smoking replacement systems are intended to provide users with an experience and satisfaction similar to that experienced with traditional smoking and tobacco products, while providing an alternative for the smoking habit.

[0007] The popularity and use of smoking replacement systems has grown rapidly over the last few years. Originally marketed as an aid to assist habitual smokers wanting to quit smoking tobacco, consumers are increasingly viewing smoking replacement systems as desirable lifestyle accessories. Some smoking replacement systems are designed to resemble traditional cigarettes, being cylindrical in shape and having a mouthpiece at one end. Other smoking replacement systems are generally non-cigarette-like (e.g., a smoking replacement device may have a generally box-like shape).

[0008] There are several different categories of smoking substitution systems, each utilizing a different smoking substitution approach, which corresponds to the way in which the substitution system operates for the user.

[0009] One approach for smoking replacement systems is the so-called "vaping" approach, in which a vaporizable liquid, typically called (and referred to herein as) "e-liquid," is heated by a heater to create an aerosol vapor that is inhaled by a user. E-liquid typically includes a base liquid and nicotine and / or flavorings. Thus, the resulting vapor typically contains nicotine and / or flavorings. The base liquid may include propylene glycol and / or vegetable glycerin.

[0010] A typical vaping smoking replacement system includes a mouthpiece, a power source (typically a battery), a tank or liquid reservoir for containing e-liquid, and a heater. In use, the power source provides electrical energy to the heater, which heats the e-liquid to create an aerosol (or "vapor") that is inhaled by the user through the mouthpiece.

[0011] Vaping smoking replacement systems can be configured in a variety of ways. For example, a "closed system" vaping smoking replacement system typically has a heater and a sealed tank, where the tank is pre-filled with e-liquid and is not intended to be refilled by the end user. Some closed system vaping smoking replacement systems include a device that includes a power source, and the device is configured to be physically and electrically coupled to the components that include the tank and the heater. In this way, when the component's tank is emptied, the device can be reused by connecting the device to a new component. Additionally, some closed system vaping smoking replacement systems are completely disposable and intended for single use only.

[0012] There are also "open system" vaping smoking replacement systems, which typically have a tank configured to be refilled by the user so that the system can be used multiple times.

[0013] An exemplary vaping smoking replacement system is the myblu™ e-cigarette. The myblu™ e-cigarette is a closed system that includes a device and a consumable component. The device and the consumable component are physically and electrically coupled together by forcing the consumable component into the device. The device includes a rechargeable battery. The consumable components include a mouthpiece, a sealed tank that contains e-liquid, and an evaporator, which in this system is a heated filament wrapped around a portion of the wick that is partially immersed in the e-liquid. The system is activated when a microprocessor on board the device detects that the user has inhaled through the mouthpiece. When the system is activated, a power source provides electrical energy to the evaporator, which heats the e-liquid from the tank to create vapor that is inhaled through the mouthpiece by the user.

[0014] Another exemplary vaping smoking replacement system is the blu PRO™ e-cigarette. The blu PRO™ e-cigarette is an open system that includes a device, a (refillable) tank, and a mouthpiece. The device and tank are physically and electrically coupled together by screwing one onto the other. The mouthpiece and refillable tank are physically coupled together by screwing one onto the other, and removing the mouthpiece from the refillable tank allows the tank to be refilled with e-liquid. The system is activated by a button on the device. When the system is activated, a power source provides electrical energy to the vaporizer, which heats the e-liquid from the tank to create vapor, which is inhaled by the user through the mouthpiece.

[0015] An alternative to the "vaping" technique is the so-called heated tobacco ("HT") technique, in which tobacco (not e-liquid) is heated or warmed to release vapour. HT is also called "heat-not-burn" ("HNB"). The tobacco can be leaf tobacco or reconstituted tobacco. In HT techniques, the intention is that the tobacco is heated in a non-combustible manner, i.e. the tobacco is not subjected to combustion.

[0016] Heating, rather than burning, tobacco materials is believed to result in fewer or smaller amounts of the more harmful compounds that are initially produced during smoking. As a result, HT techniques can reduce odors and / or health risks that may result from burning, combustion, and thermal decomposition of tobacco.

[0017] A typical HT smoking replacement system may include a device and a consumable component. The consumable component may include tobacco material. The device and the consumable component may be configured to be physically coupled together. In use, heat may be applied to the tobacco material by a heating element of the device, and airflow through the tobacco material liberates components within the tobacco material as vapor. The vapor may also be formed from carriers within the tobacco material (which may include, for example, propylene glycol and / or vegetable glycerin), as well as volatile compounds liberated from the tobacco. The liberated vapor may be entrained in the airflow carried through the tobacco.

[0018] As the vapor passes through the consumable component (entrained in the airflow) from where it evaporated to the component's outlet (e.g., mouthpiece), it cools and condenses to form an aerosol for inhalation by the user. The aerosol can contain nicotine and / or flavor compounds.

[0019] Aerosol delivery systems, such as smoking replacement systems, are not suitable for use by minors, such as children, due to the potentially harmful effects of nicotine and other substances that may be contained in the vapor generated by such systems. However, there is a risk that a smoking replacement device (or similar) may be inadvertently left within reach of, or attempted to be used by, unauthorized users, such as children. Thus, safety features are required to ensure only proper authorized use of aerosol delivery systems.

[0020] Thus, there is a need for an improved aerosol delivery system that addresses at least some of the problems of known systems. Summary of the Invention

[0021] According to a first aspect, there is provided an aerosol generation system comprising an evaporator, an airflow sensor configured to detect inhalation by a user from the system, and a controller, the controller being configured to activate the evaporator only when the duration of inhalation by the user exceeds a predefined duration threshold.

[0022] Since the controller is configured to activate the vaporizer only when the duration of inhalation by the user exceeds a predefined duration threshold, a safety mechanism is provided to reduce the likelihood that an unauthorized user, such as a child, will be physically able to provide (and / or realize the need to) a suitably long duration inhalation to activate the vaporizer. If the vaporizer is not activated, the system cannot create aerosol / vapor and therefore such aerosol / vapor cannot be inhaled by an unauthorized user. Accidental or unauthorized use of the system by an inappropriate user, such as a child, is thus avoided or at least the probability of such occurring is significantly reduced. This provides peace of mind to authorized users and also prevents the risk of the system causing harm to inappropriate users, such as children. Such safety and peace of mind is provided efficiently, and the controller can function with one or more commonly provided sensors, detectors, or measurement components to determine the duration of inhalation and compare it to one or more duration thresholds. The comparison can be made quickly by the controller, such that activation of the aerosol generating means by an authorized or appropriate user and generation of the desired vapor can occur, from the user's perspective, substantially instantaneously upon the user's inhalation. Thus, a safety feature is provided without causing inconvenience or delay to authorized users.

[0023] Optional features are described below, which may be applied alone or in any combination with any aspect.

[0024] The aerosol generating system may further include a clock or timer configured to measure the duration of inhalation by a user. The clock or timer may be included within or in communication with the airflow sensor and / or controller.

[0025] The airflow sensor may be or may comprise a mechanical-electrical sensor, a MEMS actuated sensor, a pressure differential sensor, a mass flow sensor, a temperature sensor, a fluid velocity sensor, a flow sensor, or any combination thereof. The airflow sensor may comprise a microphone, such as a dynamic microphone, a condenser microphone, a capacitive microphone, or a piezoelectric microphone, or any combination thereof. The airflow sensor may comprise one or more moving elements, such as a movable baffle, the movement of which may be measured to determine airflow characteristics in response to inhalation by a user.

[0026] The predefined duration threshold that an inhalation by a user must meet or exceed can be of any suitable length (units of time), for example it can be 3 or 4 seconds or more, such as 5 or 6 seconds or more.

[0027] The controller described above, and / or another controller associated with the aerosol generation system, may be configured to perform one or more additional comparisons before allowing activation of the vaporizer in response to inhalation by a user.

[0028] For example, such a controller may be configured to activate the vaporizer only when the duration of inhalation by the user exceeds a predefined duration threshold and the detected pressure of the inhalation by the user exceeds a predefined pressure threshold.

[0029] The predefined pressure / volume threshold may be a suitable value associated with inhalation by an adult, e.g., a typical maximum adult inspiratory pressure (PIMAX), which is unlikely to be achievable by a child. The PIMAX value may be between -100 and -70 cmH2O.

[0030] The controller and / or another controller associated with the aerosol generating system may be configured to activate the vaporizer only when the duration of the inhalation by the user exceeds a predefined duration threshold and the detected pressure difference / drop of the inhalation by the user exceeds a predefined pressure difference / drop threshold. The predefined pressure difference / drop threshold may be a suitable value associated with inhalation by an adult, such value being unlikely to be achievable by a child. For example, the pressure difference / drop threshold may be 3 psi, more preferably 5 psi, more preferably 7 psi.

[0031] The controller, and / or another controller associated with the aerosol generating system, may be configured to activate the vaporizer only when the duration of the inhalation by the user exceeds a predefined duration threshold and the detected "inhalation volume" (or mass flow volume) of the inhalation by the user exceeds a predefined mass flow volume threshold. The predefined mass flow volume threshold may be a suitable value associated with inhalation by an adult, such a value being unlikely to be achievable by a child. For example, the mass flow volume threshold may be 10 milliliters per second (ml / s) or greater, e.g., 20 ml / s or greater, or 30 ml / s or greater.

[0032] The use of one or more additional comparisons (in addition to the comparison of inhalation duration to a threshold) can increase the reliability of the safety mechanism by providing two or more barriers that an unauthorized user must overcome (that are unlikely to be physically possible to overcome) before activating the system to generate aerosol, and further provides redundancy in the event of a system failure in either of these comparisons.

[0033] The inhalation by the user may be a first inhalation by the user, and the controller may be configured to activate the vaporizer only when the duration of the first inhalation by the user exceeds a predefined duration threshold.

[0034] The system can be configured to allow continued operation of the vaporizer for at least a predetermined period of time after the vaporizer is activated by a suitable first inhalation. Accordingly, in some embodiments, the system is not configured to require that a predefined duration threshold be met or exceeded by every inhalation taken by the user, at least for a predetermined period of time after the first inhalation, or at least for, e.g., a predetermined number of inhalations after an inhalation by the user.

[0035] A "first inhalation by a user" can be the first inhalation that a user applies to the aerosol generating system during a particular smoking session. Additionally / alternatively, a "first inhalation by a user" can include an inhalation that occurs after a predefined period of inactivity and / or a certain number of inhalations since a previous inhalation during which the inhalation duration had to meet or exceed a predefined duration threshold.

[0036] The system may include a device that cooperates with the component to contain the aerosol precursor.

[0037] The device includes a power source, which may be a battery. The power source may be a capacitor. The power source may be a rechargeable power source. The device may include a charging connection for connecting to an external power source for recharging the power source within the device.

[0038] The device may include a device body for housing a power source and / or other electrical components. The device body may be an elongated body, i.e., may have a length that is greater than its depth / width. The device body may have a width that is greater than its depth.

[0039] The device body may have a length of 5 to 30 cm, such as 5 to 10 cm, for example 7 to 9 cm. The maximum depth of the device body may be 5 to 15 mm, for example 9 to 12 mm.

[0040] The device body can have a front surface that is curved in the lateral dimension. The device body can have a rear surface that is curved in the lateral dimension. The curvatures of the front and rear surfaces can be in opposite directions. Both the front and rear surfaces can be convex in the lateral dimension. The front and rear surfaces can have equal radii of curvature.

[0041] The device body can have a substantially elliptical cross-sectional shape.

[0042] The device body can have a linear longitudinal axis.

[0043] The front and / or rear of the device body may include at least one visual user feedback element, such as one or more lights, for example one or more LEDs.

[0044] In some embodiments, the device body may include an illumination area configured to allow light provided by a visual user feedback element (e.g., one or more lights / LEDs) within the device body to pass through.

[0045] The device may be equipped with a motion detection unit (eg, an accelerometer) for detecting movement of the device.

[0046] The device may comprise a haptic feedback generating unit (eg, an electric motor and a weight eccentrically mounted on the shaft of the electric motor).

[0047] The device may include a controller.

[0048] The controller can be configured to identify device operation and, based on the identified device operation, control one or more lights contained within the device body (e.g., to illuminate an illumination area).

[0049] The controller may be configured to control the haptic feedback generation unit to generate haptic feedback in response to detection of movement of the device by the movement detection unit.

[0050] A memory may be provided and may be operatively connected to the controller. The memory may include non-volatile memory. The memory may include instructions that, when implemented, cause the controller to perform certain tasks or steps of a method.

[0051] The device may be equipped with a wireless interface, which may be configured to communicate wirelessly with another device, e.g., a mobile device, for example via Bluetooth. To this end, the wireless interface may include a Bluetooth antenna. Other wireless communication interfaces, e.g. WiFi, are also possible. The wireless interface may also be configured to communicate wirelessly with a remote server.

[0052] The device may include an airflow sensor, which may be operatively connected to the controller such that the airflow sensor is capable of providing a signal to the controller indicative of the occurrence (and duration) of inhalation by the user.

[0053] The device can include an electrical connection (eg, one or more contact pins) for connecting a power source to the vaporizer.

[0054] The device may include a chassis within the device body, and one or more of the device's electrical components (e.g., one or more of a power source, a charging connection, a visual feedback element, a motion detection unit, a haptic feedback generation unit, a controller, a memory, a wireless interface, an airflow sensor, and / or electrical connections) may be mounted or affixed to the chassis.

[0055] The system may further comprise a component for containing the aerosol precursor.

[0056] The component may be an aerosol delivery (e.g., smoking replacement) consumable, i.e., in some embodiments, the component may be a consumable component for engaging with an aerosol delivery (e.g., smoking replacement) device to form an aerosol delivery (e.g., smoking replacement) system.

[0057] The device can be configured to receive the consumable component. The device and the consumable component can be configured to physically couple together. For example, the consumable component can be at least partially received within a recess in the device (e.g., within a recess defined by the device housing). A snap engagement can be provided between the device and the consumable component. Alternatively, the device and the consumable component can be physically coupled together by screwing one onto the other or by a bayonet fitting.

[0058] Thus, the consumable component may include one or more engagement portions for engaging the device.

[0059] The device and the consumable component can be coupled together by magnetic attraction, for example, the device can comprise at least one magnet and the component can comprise a magnet or an iron plate.

[0060] The consumable component may comprise an evaporator. The evaporator may comprise a heating element. Alternatively, the evaporator may comprise an ultrasonic or flow expanding unit, or an inductive heating system.

[0061] The consumable component may include an electrical interface for connecting to a corresponding electrical interface of the device. One or both of these electrical interfaces may include one or more electrical contacts. Thus, when the device is engaged with the consumable component, the electrical interface may be configured to transfer power from a power source to an evaporator (e.g., a heating element) of the consumable component. The electrical interface may also be used to identify the consumable component from a list of known types. The electrical interface may additionally or alternatively be used to identify that a consumable component has been connected to the device.

[0062] The device may alternatively or additionally allow for detection of information regarding the consumable component via an RFID reader, a barcode, or a QR code reader. The interface may allow for identifying the characteristics (e.g., type) of the consumable. In this regard, the consumable component may include any one or more of an RFID chip, a barcode, or a QR code, or a memory, in which an identifier is included and which can be queried via the interface.

[0063] In other embodiments, the components can be integrally formed with an aerosol delivery (eg, smoking alternative) device to form an aerosol delivery (eg, smoking alternative) system.

[0064] In such embodiments, the aerosol forming agent (e.g., e-liquid) can be replenished (rather than replaced as a consumable) by a refill tank integrated with the device. Access to the tank (to refill the e-liquid) can be provided via an opening to the tank that can be sealed, for example, by a closure (e.g., a cap).

[0065] The smoking replacement system may include an air flow path, the air flow path extending from an air inlet to an outlet. The air inlet may be provided within the device body. The outlet may be located in a mouthpiece portion of the component. In this regard, a user may draw fluid (e.g., air) along the air flow path and into the air flow path by inhaling (i.e., using the mouthpiece portion) on the outlet. An airflow sensor may be configured to detect air at one or more points along the air flow path.

[0066] The air flow path passes through the evaporator between the air inlet and the outlet. The evaporator may be provided within the component.

[0067] The air flow path may include a first portion extending from the air inlet toward the evaporator. A second portion of the air flow path passes through the evaporator (e.g., over or around the evaporator) to a conduit that extends to the outlet. The conduit may extend along an axial center of the component.

[0068] References to "downstream" with respect to an air flow path are intended to refer to a direction toward the outlet / mouthpiece portion. Thus, a second portion of the air flow path is located downstream of a first portion of the air flow path. Conversely, references to "upstream" are intended to refer to a direction toward the air inlet. Thus, the first portion of the air flow path (and the air inlet) is located upstream of the second portion of the air flow path (and the outlet / mouthpiece portion).

[0069] References to "upper," "lower," "above," or "below" are intended to refer to a component when in an upright / vertical orientation, i.e., when the elongated (longitudinal / length) axis of the component is aligned vertically and the mouthpiece is in its uppermost vertical position.

[0070] The component can include a tank for storing an aerosol precursor (e.g., a liquid aerosol precursor). The aerosol precursor can include an e-liquid, e.g., including a base liquid and e.g., nicotine. The base liquid can include propylene glycol and / or vegetable glycerin.

[0071] The conduit may extend through the tank, with the conduit walls defining an interior region of the tank, in which respect the tank may surround the conduit, for example the tank may be annular.

[0072] As discussed above, the air flow path passes through (e.g., over or around) the evaporator between the air inlet and outlet. The evaporator can be located within an evaporator chamber that can form a portion of the air flow path.

[0073] The vaporizer can include a wick. The wick can form the base of the tank so that the aerosol precursor can contact the wick. The wick can include one or more channels on its upper surface (facing the tank), which are in fluid communication with the tank.

[0074] The wick can have a length and a width that define its upper surface, and a depth aligned with the longitudinal axis of the component. Thus, the upper surface and the opposing lower surface of the wick can lie in respective planes that are orthogonal to the longitudinal axis of the component and longitudinal to the first and third portions of the air flow passage.

[0075] The wick can include a porous material, such as a ceramic material. A portion of the wick, such as at least a portion of the lower surface and / or at least a portion of at least one sidewall extending between the upper and lower surfaces (in the depth direction), can be exposed to the air flow in the second portion of the air flow path.

[0076] The heating element may be in the form of a heater track located on the underside of the wick, for example the wick.

[0077] In other embodiments, the wick may be a cylindrical porous wick formed, for example, from cotton or ceramic. The wick may be oriented to extend in the direction of the width dimension of the component (perpendicular to the longitudinal axis of the component). Thus, the wick may extend in a direction perpendicular to the direction of airflow in the airflow passage. Both ends of the wick may protrude into the tank and a central portion (between the ends) may extend across the airflow passage so as to be exposed to the airflow. Thus, fluid may be drawn from the tank along the wick to the exposed portion of the wick (e.g., by capillary action). The heating element may be in the form of a filament wound around the wick (e.g., the filament may extend in a spiral around the wick). The filament may be wound around the exposed portion of the wick.

[0078] The heating element is electrically connected (or connectable) to a power source. Thus, in operation, the power source can supply electricity (i.e., apply a voltage) to the heating element to heat it. This can heat a liquid stored in the wick (i.e., drawn from the tank) to form a vapor that can be entrained in the airflow along the air flow path. This vapor can then cool to form an aerosol, for example, in the conduit.

[0079] In a second aspect, there is provided a method of using an aerosol delivery (e.g., smoking replacement) system according to the first aspect, the method comprising engaging a consumable component with an aerosol delivery (e.g., smoking replacement) device (described above) having a power source and electrically connecting the power source to the consumable component (i.e., the vaporizer of the consumable component).

[0080] In a third aspect, there is provided a method of controlling activation of an evaporator in an aerosol generating system that also includes a controller and an airflow sensor, the method including sensing an inhalation by a user from the aerosol generating system, determining a duration of the inhalation by the user, comparing the duration of the inhalation by the user to a predefined duration threshold, and activating the evaporator if the duration of the inhalation by the user exceeds the predefined duration threshold.

[0081] As discussed above, the inhalation by the user may be the first inhalation by the user.

[0082] The method may further include determining a pressure of the inhalation by the user before the vaporizer is activated and comparing the determined pressure of the inhalation by the user to a predefined pressure threshold. The method may further include activating the vaporizer only if the duration of the inhalation by the user exceeds the predefined duration threshold and the determined pressure of the inhalation by the user exceeds the predefined pressure threshold.

[0083] The method may further or alternatively include determining a pressure differential of the inhalation by the user and comparing the determined pressure differential of the inhalation by the user to a predefined pressure differential threshold before the vaporizer is activated. The method may further include activating the vaporizer only if the duration of the inhalation by the user exceeds the predefined duration threshold and the determined pressure differential of the inhalation by the user exceeds the predefined pressure differential threshold.

[0084] The method may further or alternatively include determining a mass flow volume of an inhalation by the user (or "inhalation volume") and comparing the determined mass flow volume of an inhalation by the user to a predefined mass flow volume threshold before the vaporizer is activated. The method may further include activating the vaporizer only if the duration of the inhalation by the user exceeds the predefined duration threshold and the determined mass flow volume of the inhalation by the user exceeds the predefined mass flow volume threshold.

[0085] According to a fourth aspect, there is provided a computer readable medium containing instructions configured, when executed by a processor or by an application installed on a mobile device, to cause the processor or application to perform the method of the third aspect.

[0086] The present invention includes combinations of the described embodiments and preferred features except where such combinations are clearly unacceptable or specifically avoided. [Brief description of the drawings]

[0087] So that further aspects and features thereof can be understood, the embodiments will now be discussed in more detail with reference to the accompanying figures.

[0088] [Figure 1] 1A is a front schematic view of a smoking replacement system, FIG IB is a front schematic view of a device of the system, and FIG 1C is a front schematic view of components of the system. [Diagram 2] Figure 2A is a schematic diagram of the electrical components of the device, and Figure 2B is a schematic diagram of portions of the components. [Diagram 3] FIG. 3 is a further schematic diagram of the components. [Figure 4] Figure 4A shows the human lungs and diaphragm during inspiration and Figure 4B shows the human lungs and diaphragm during expiration. [Diagram 5]FIG. 5 illustrates an improved method for controlling aerosol generation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0089] Aspects and embodiments are now discussed with reference to the accompanying figures. Further aspects and embodiments will be apparent to those skilled in the art.

[0090] 1A illustrates a first embodiment of a smoking replacement system 100. In this example, the smoking replacement system 100 includes a device 102 and a component 104. Alternatively, the component 104 may be referred to as a "pod," a "cartridge," or a "cartomizer." It should be understood that in other examples (i.e., open systems), the device may be integrated with the component. In such systems, a reservoir of the aerosol delivery system may be accessible for refilling the device.

[0091] In this example, the smoking replacement system 100 is a closed system vaping system, where the component 104 includes a sealed tank 106 and is intended for one-time use only. The component 104 is removably engageable with the device 102 (i.e., for removal and replacement). FIG. 1A shows the smoking replacement system 100 with the device 102 physically coupled to the component 104, FIG. 1B shows the device 102 of the smoking replacement system 100 without the component 104, and FIG. 1C shows the component 104 of the smoking replacement system 100 without the device 102.

[0092] The device 102 and the component 104 are configured to be physically coupled together by forcing the component 104 into a cavity in the top end 108 of the device 102, thus creating an interference fit between the device 102 and the component 104. In other examples, the device 102 and the component can be coupled by screwing one onto the other or by a bayonet fitting.

[0093] The component 104 includes a mouthpiece portion located at an upper end 109 of the component 104 and one or more air inlets (not shown) in fluid communication with the mouthpiece portion such that when a user inhales through the mouthpiece portion, air can be drawn into and through the component 104. A tank 106 for containing e-liquid is located at a lower end 111 of the component 104.

[0094] The bottom end 110 of the device 102 also includes a light 116 (e.g., an LED) located behind a small translucent cover. The light 116 can be configured to illuminate when the smoking replacement system 100 is activated and / or charging. Although not shown, the component 104 can indicate the identity of the component 104 to the device 102 via an electrical interface, an RFID chip, or a bar code.

[0095] The bottom end 110 of the device 102 also includes a charging connection 115 that can be used to charge a battery within the device 102. The charging connection 115 can also be used to transfer data to and from the device, for example to update firmware on the device.

[0096] 2A and 2B are schematic diagrams of device 102 and components 104. As seen in FIG. 2A, device 102 includes a power source 118, a controller 120, a memory 122, a wireless interface 124, an electrical interface 126, and optionally, one or more additional components 128.

[0097] The power source 118 is preferably a battery, more preferably a rechargeable battery. The controller 120 may include, for example, a microprocessor. The memory 122 preferably includes a non-volatile memory. The memory may include instructions that, when implemented, cause the controller 120 to perform certain tasks or steps of a method.

[0098] The wireless interface 124 is preferably configured to communicate wirelessly with another device, e.g., a mobile device, for example via Bluetooth. To this end, the wireless interface 124 may include a Bluetooth antenna. Other wireless communication interfaces, e.g., WiFi, are also possible. The wireless interface 124 may also be configured to communicate wirelessly with a remote server.

[0099] The electrical interface 126 of the device 102 may include one or more electrical contacts. The electrical interface 126 may be located at the base of an aperture in the top end 108 of the device 102. The electrical interface 126 is configured to transfer electrical power from the power source 118 to the component 104 when the device 102 is physically coupled to the component 104 (i.e., upon activation of the smoking replacement system 100).

[0100] The electrical interface 126 can also be used to identify the component 104 from a list of known components. For example, the component 104 can be a particular flavor and / or have a particular concentration of nicotine (which can be identified by the electrical interface 126). This can be indicated to the controller 120 of the device 102 when the component 104 is connected to the device 102. Additionally or alternatively, a separate communication interface can be provided in the device 102 and a corresponding communication interface can be provided in the component 104, so that when connected, the component 104 can indicate its identity to the device 102.

[0101] Additional components 128 of the device 102 may include the lights 116 discussed above.

[0102] Additional components 128 of device 102 also include a charging connection 115 configured to receive power from a charging station (i.e., when power source 118 is a rechargeable battery), which may be located at the bottom end 110 of device 102.

[0103] Additional components 128 of device 102 may include battery charging control circuitry for controlling charging of the rechargeable battery if power source 118 is a rechargeable battery, but the battery charging control circuitry may also be located in the charging station (if present).

[0104] The additional component 128 of the device 102 may include a sensor, such as an airflow (i.e., puff) sensor for detecting airflow in the smoking replacement system 100 caused, for example, by a user inhaling through a mouthpiece portion 136 of the component 104. The smoking replacement system 100 may be configured to be activated when airflow is detected by the airflow sensor. This sensor may alternatively be included within the component 104. The airflow sensor may be used, for example, to determine how much the user inhales on the mouthpiece or how many times the user inhales on the mouthpiece within a particular period of time.

[0105] Additional components 128 of the device 102 may include a user input, such as a button. The smoking alternative system 100 may be configured to be activated when a user interacts with the user input (e.g., pressing a button). This provides an alternative to an airflow sensor as a mechanism for activating the smoking alternative system 100.

[0106] As shown in FIG. 2B, the components 104 include a tank 106, an electrical interface 130, an vaporizer 132, one or more air inlets 134, a mouthpiece portion 136, and one or more additional components 138.

[0107] The electrical interface 130 of the component 104 may include one or more electrical contacts. The electrical interface 126 of the device 102 and the electrical interface 130 of the component 104 are configured to contact one another when the bottom end 111 of the component 104 is inserted into the top end 108 (shown in FIG. 1A ) of the device 102, thereby electrically coupling the device 102 to the component 104. In this manner, electrical energy (e.g., in the form of an electrical current) can be provided from the power source 118 in the device 102 to the vaporizer 132 in the component 104.

[0108] The vaporizer 132 is configured to heat and vaporize the e-liquid contained within the tank 106 using electrical energy provided by the power source 118. As described further below, the vaporizer 132 includes a heating filament and a wick. The wick draws the e-liquid from the tank 106, and the heating filament heats the e-liquid to vaporize the e-liquid.

[0109] The one or more air inlets 134 are preferably configured to allow air to be drawn into the smoking replacement system 100 when a user inhales through the mouthpiece portion 136. When the component 104 is physically coupled to the device 102, the air inlets 134 receive air that flows along a gap between the device 102 and the bottom end 111 of the component 104 to the air inlets 134.

[0110] In operation, a user activates the smoking replacement system 100, for example, by interacting with a user input forming part of the device 102, or by inhaling through the mouthpiece portion 136 as described above. Once activated, the controller 120 can provide electrical energy from the power source 118 to the vaporizer 132 (via the electrical interfaces 126, 130), which can cause the vaporizer 132 to heat e-liquid drawn from the tank 106 to produce vapor, which is inhaled by the user through the mouthpiece portion 136.

[0111] One example of one of the one or more additional components 138 of the component 104 is an interface for obtaining an identifier of the component 104. As discussed above, this interface can be, for example, an RFID reader, a barcode, a QR code reader, or an electronic interface capable of identifying the component. Thus, the component 104 can include any one or more of an RFID chip, a barcode, or a QR code, or a memory having an identifier included therein that can be queried via an electronic interface in the device 102.

[0112] It should be understood that the smoking replacement system 100 shown in Figures 1A-2B is merely one exemplary implementation of a smoking replacement system, for example, the system could otherwise be in the form of a completely disposable (single use) system or an open system in which the tank is refillable (not replaceable).

[0113] 3 is a schematic diagram of one example of the component 104 described above. The component 104 comprises a reservoir 106 for storing e-liquid, a mouthpiece portion 136, and a conduit 140 extending along a longitudinal axis of the component 104. In the embodiment shown, the conduit 140 is in the form of a tube having a substantially circular cross-section (i.e. transverse to the longitudinal axis). The reservoir 106 surrounds the conduit 140, such that the conduit 140 extends centrally through the reservoir 106.

[0114] The component housing 142 defines the outer enclosure of the component 104. The component housing 142 extends from a lower shell 158 located at the bottom end 111 of the component 104 to a mouthpiece portion 136 located at the top end 109 of the component 104. The component housing can define a lip or shoulder that acts as a stop feature when the component 104 is inserted into the device 102 (i.e., by contacting the top edge of the device 102).

[0115] The reservoir 106, the conduit 140, and the mouthpiece portion 136 are integrally formed together to form a unitary component, and may be formed, for example, by an injection molding process. Such a component may be formed from a thermoplastic material.

[0116] The mouthpiece portion 136 includes a mouthpiece aperture 148 that defines an outlet for the conduit 140. The vaporizer 132 is located downstream of the inlet 134 of the component 104 and is fluidly connected to the mouthpiece aperture 148 (i.e., the outlet) by the conduit 140.

[0117] In some embodiments, the evaporator 132 comprises a porous ceramic wick and a heater track (not shown) printed on the bottom surface (facing the inlet 34) of the ceramic wick.

[0118] The vaporizer 132 forms the base of the tank 106 so that the aerosol precursor contacts the wick and the liquid aerosol precursor can move axially into the wick.

[0119] In other embodiments, the vaporizer 132 comprises a porous cylindrical wick wound with a heating filament, the wick extending into an annular portion of a tank surrounding the vaporizer such that the liquid aerosol precursor can move radially into the wick.

[0120] The aerosol precursor is heated by a heater track or heated filament (e.g., when activated by detection of inhalation), which vaporizes and entrains the aerosol precursor in the air flowing over the wick. As this vaporized liquid cools, it can form an aerosol in the conduit 140, which can then be inhaled by a user.

[0121] The lower shell 158 of the component housing 142 has an opening that receives the electrical interface 119 of the consumable component 102, which comprises two electrical contacts 136a, 136b that are electrically connected to the heater track. In this way, when the consumable component 104 is engaged with the device 102, power can be provided from the device's power supply 118 to the heater track / heating filament.

[0122] The improved aerosol generating system disclosed herein is configured for safer and more appropriate use. In particular, the improved aerosol generating system is configured to prevent or at least reduce the probability of use of the aerosol generating system by unauthorized users, for example minor users such as children. The improved aerosol generating system provides for safer and more appropriate use by being configured to activate its aerosol generating function only when a predetermined user's interaction with the device occurs. In particular, the improved aerosol generating system is configured to activate the aerosol generating function only when a user's inhalation at the device meets one or more predetermined conditions or falls within one or more predetermined thresholds. One or more indicators can be used by a processor or controller included in or associated with the improved aerosol generating system to determine the occurrence of such inhalation.

[0123] The inventors recognize that there are inherent physical differences between a typical adult inhaling an aerosol delivery device and a typical non-adult (or child) inhaling an aerosol delivery device. These differences may be particularly evident between adults and younger children, such as children under the age of 6, although the present disclosure is not limited to solely distinguishing between adults and children in that age group.

[0124] It is recognized herein that when a person inhales with a device such as an aerosol delivery device, simply inserting the mouthpiece of such a device (or the mouthpiece of a component connected to such a device) into the mouth and breathing normally is generally not sufficient to draw in enough air for the desired vapor generation or inhalation of the vapor. Instead, some degree of deliberate force or effort must be used during the act of inhaling with an aerosol delivery device. Furthermore, when an adult inhales with an aerosol delivery device, a relatively long inhalation (i.e., an inhalation of a relatively greater duration compared to a typical unconscious inhalation) is the norm to initiate vapor generation and also allow the vapor itself to be inhaled. Typically, adult users of an aerosol delivery device use "abdominal breathing" when inhaling with an aerosol delivery device, which is a breathing mode that requires the diaphragm to contract. This type of breathing is also known as "deep breathing".

[0125] It is further recognized herein that children typically do not use abdominal breathing, especially in atypical or unfamiliar situations, such as when attempting to inhale with an aerosol delivery device that has been unintentionally left within reach of an unsupervised child. Furthermore, the inventors recognize that when unauthorized or underage users, such as unsupervised children, attempt to inhale with an aerosol delivery device, and even when attempting abdominal or deep breathing, they typically cannot take a deep breath with the same pressure or force as an adult, or for the same length of time as an adult. Thus, it is recognized herein that these differences in inhalation characteristics between adults and children can be used to control the "unlocking" or "activation" of an aerosol delivery device, such as a smoking replacement device, thereby acting as a "child lock" or safety mechanism to prevent unauthorized use of the aerosol delivery device, especially by children. This is particularly important when the aerosol delivery device constitutes a smoking replacement device that contains tobacco or other substances that are harmful to children.

[0126] Abdominal or deep breathing may be further understood in connection with Figures 4A and 4B herein. Those skilled in the art will recognize that in human anatomy, the diaphragm 302 is a naturally dome-shaped or "U-shaped" muscle located below the lungs 300 in a person's thoracic cavity. As shown in Figure 4A, during the inspiration phase of "deep breathing" or "abdominal breathing", the diaphragm 302 contracts, flattens and physically descends, thus creating space within the thoracic cavity for the lungs 300 to expand. This increases the lung volume capacity and allows additional air to enter the lungs. This type of breathing also typically draws or inhales air with greater pressure or force than occurs during a typical involuntary breathing movement, which tends to be shallower and does not flatten the diaphragm as much, if at all. Abdominal breathing also allows air to be inhaled at a faster rate than is achieved by shallower breathing, and typically increases the duration of inhalation compared to the inhalation that occurs during unconscious shallower breathing.

[0127] It will be appreciated that abdominal breathing requires strength and effort, and as a general rule, the increases in factors such as the pressure, force, rate, and duration of inhalation that occur during abdominal breathing (as compared to shallower, involuntary breathing) will be more pronounced (i.e., greater) in larger, physically stronger individuals than in smaller, physically weaker individuals. Moreover, these factors typically increase in accordance with the amount of deliberate effort the user applies to inhalation.

[0128] 4B shows the lungs 300 and diaphragm 302 during the exhalation phase of "deep breathing" or "abdominal breathing." As can be seen in this figure, during exhalation, the diaphragm 302 relaxes and returns to its dome shape, thereby reducing the volume of the lung volume and allowing air to passively leave the lungs. During use of an aerosol delivery device, this is typically the stage at which the user would exhale previously inhaled vapor.

[0129] The improved aerosol generating system disclosed herein is configured to activate its vaporizer only when one or more indicators indicate that inhalation by an adult on the device has occurred (or is currently occurring). According to an embodiment, the improved aerosol device is configured to activate its vaporizer only when inhalation of at least a predetermined duration has occurred. As detailed above, the length (in time units) of inhalation in one continuous breath will typically differ between adults and children. Thus, in an embodiment, the improved aerosol device is configured to require inhalation to occur for a certain length of time (i.e., duration) to activate the vaporizer. This allows the device to be protected from accidental or unauthorized use by inappropriate users, such as children.

[0130] One embodiment of the improved aerosol generating system can be understood in relation to Figures 2A and 2B. In this embodiment, the improved aerosol generating system comprises a reusable smoking replacement device 102. A disposable / replaceable component 104, comprising a pod, cartomizer, or cartridge, comprises a tank filled or refillable with an aerosol precursor, which is connectable to the device 102 for smoking replacement operation. The disposable component 104 can be a single-use component, but more likely can be suitable for multiple uses until its tank 106 is emptied, at which point the component 104 can be discarded and a replacement component 104 can be used instead for smoking replacement operation associated with the reusable device 102. However, the improved aerosol generating system described herein, as well as the inhalation sensing and comparison method described below, are not limited to this type of aerosol generating system, and thus this embodiment should be considered exemplary rather than limiting to the present disclosure.

[0131] In this embodiment, the smoking replacement system includes an airflow sensor. The airflow sensor can be a single entity or can include multiple parts. In this embodiment, the airflow sensor is included in the "additional components" 128 of the smoking replacement device 102. However, in some arrangements, the airflow sensor can be included in the components 104, or the airflow sensor can include at least one part located in the device 102 and at least one part located in the components 104, and it is envisioned that these parts function in conjunction with each other.

[0132] In general, the airflow sensor is configured to sense one or more characteristics associated with a user's inhalation of air from the smoking replacement system and to function with the controller 120 to control activation of the vaporizer only when the user's inhalation meets one or more predetermined conditions or thresholds. If a user inhales when the vaporizer is not yet active and the inhalation does not meet a specified limit or threshold, the device 102 is configured to not recognize the inhalation as a suitable activation, and thus the device 102 remains in a dormant / inactive state and does not generate aerosol vapor.

[0133] The airflow sensor comprises an airflow sensor arranged to detect airflow through the smoking replacement system, for example, when a user inhales through the mouthpiece portion 136 of the component 104 when connected to the device 102. The airflow sensor can be of any suitable type and can comprise any suitable component part. For example, the airflow sensor can be or comprise a mechanical-electrical sensor, a MEMS-activated sensor, a pressure differential sensor, a mass flow sensor, a temperature sensor, a fluid velocity sensor, or a flow sensor, or any combination thereof. The airflow sensor can comprise a microphone, such as a dynamic microphone, a condenser microphone, a capacitive microphone, or a piezoelectric microphone, or any combination thereof. The airflow sensor (or another part of the device 102) can comprise one or more moving elements, such as a moving baffle, the movement of which can be measured to determine airflow characteristics for an inhalation event.

[0134] In this embodiment, the airflow sensor may comprise or be connected / communicated with a clock or timer, and thus measure the duration of the inhalation (i.e., the length in time units from start to finish). For example, the clock may be included within the controller. The airflow sensor may be configured to detect airflow and generate a suitable signal to enable the controller to determine the duration of the inhalation that caused the airflow.

[0135] The device 102 is configured to compare the duration of the inhalation with a predefined time limit or threshold, and to allow the vaporizer 132 to be activated (e.g., to start providing power to operate the vaporizer 132 for heating the aerosol precursor in the wick) only if the duration of the inhalation is at least as long (in time units) as the predefined time limit or threshold. For example, the controller 120 can be configured to perform such a comparison and control the issuance of one or more control signals to control the activation and operation of the vaporizer 132. The control signals can be sent directly to the vaporizer 132 or can be sent to another element, such as, for example, the electrical interface 126, 130 or other node or connection point, to enable or prevent the provision of power to the vaporizer 132 for heating and aerosol generation. Thus, the device 102 is configured to not allow the vaporizer 132 to be activated if the duration of the inhalation does not meet or exceed the predefined time limit or threshold.

[0136] The predetermined time limit or time threshold may be stored in the memory 122 and / or may be communicated to the controller from a memory external to the device 102 or other source.

[0137] The predetermined time limit or time threshold against which the user's inhalation is compared by the smoking replacement device 102 may be predetermined before the user purchases the device 102. For example, a manufacturer or programmer of the device 102 may store the predetermined time limit or time threshold for such comparison in the memory 122 of the device 102. The predetermined time limit may be 3 seconds, more preferably 4 seconds, more preferably 5 seconds.

[0138] After the vaporizer 132 is activated via suitable inhalation, the device 102 is configured to continue operation of the vaporizer 132 for at least a predetermined period of time. The device 102 may be configured to shut off the vaporizer 132 after the predetermined period of time and / or if no user activity is detected (e.g., no inhalation is detected), for at least a predetermined period of time.

[0139] The device 102 may be configured to perform a comparison of the duration of the current inhalation with a predetermined time limit or threshold at a particular selected time or in a particular selected situation.

[0140] The device 102 is configured to perform a comparison between the duration of the current inhale and a predetermined time limit or threshold when the vaporizer 132 is currently in an inactive / dormant state. For example, the device 102 can be configured to perform the comparison for the first inhale since the smoking substitution system has been inactive (i.e., unused) for at least a predetermined length of time. Thus, such an embodiment can require the user to apply a deliberately long inhale at the beginning of a smoking substitution operation to initiate activation of the vaporizer 132 after a period of inactivity, but can then allow the user to continue the smoking substitution operation using a shorter inhale, requiring another deliberately long inhale only after a next period of at least the predetermined duration (or the next period of inactivity).

[0141] The improved aerosol generating system disclosed herein is advantageous because it allows the user and / or manufacturer to set a relatively large time limit for the first inhalation, for example, exceeding a typical desired inhalation duration, such as 3 seconds, more preferably 4 seconds, more preferably 5 seconds, for an adult (or for that particular adult, if set by the user), thereby reducing the likelihood that an unauthorized user, such as a child, can apply (or knows about) the physical effort required to initiate aerosol generation. However, after the initial activation of the vaporizer 132 by an authorized adult user, that user should not need to continue to apply such a long inhalation in order to operate the smoking replacement system. Thus, an authorized user can enjoy a smoking replacement operation that suits his or her inhalation preferences at any given time, which may include shorter inhalations, without compromising the safety features that the device 102 is configured to provide. This also fits with the general smoking replacement operation pattern, where a user may apply a long inhalation at the beginning of his or her smoking replacement operation and may want to enjoy the vapor effect after a period of device non-use, but may prefer to apply shorter inhalations or "puffs" thereafter.

[0142] In some embodiments, the smoking replacement system can be configured to perform two or more comparisons before commencing activation of the vaporizer 132. Additional comparisons (described in more detail below) can also be required every time the vaporizer 132 is activated after a period of inactivity, or only at certain times or under certain conditions.

[0143] According to one embodiment, the device 102 is configured to perform the inhalation duration comparison detailed above, and also to perform a comparison on the detected inhalation pressure compared to a predefined pressure limit or threshold. In such an embodiment, both comparisons must result in a positive result, i.e., the current inhalation must last for or exceed a predefined length of time, and the pressure must meet or exceed a predefined pressure limit, for the device 102 to enable activation of the vaporizer 132 for aerosol generation. The pressure of the inhalation can be detected by any suitable component. The pressure limit can be pre-set by the manufacturer or programmer, or in some embodiments, the user can be allowed to set or select their own pressure limit, for example, during an initial setup process. The requirement for the two comparisons to result in a positive result to enable activation of the vaporizer 132 increases the reliability of the safety mechanism provided by the improved aerosol generation system disclosed herein, since it is less likely that an unauthorized user, such as a child, will be able to mimic both aspects of an adult's inhalation and thereby activate the device. Requiring two comparisons also provides a fail-safe in the event of a device error. That is, if the sensing, measurement, or comparison of one parameter (e.g., duration) against its respective threshold is inaccurate, the remaining requirement for the other corresponding parameter to provide a positive comparison reduces the likelihood that an unauthorized user will be successful in attempting to improperly activate device 102.

[0144] According to one embodiment, the device 102 is configured to perform the inhalation duration comparison detailed above, and also to perform a comparison of the detected pressure difference or pressure drop during (or as a result of) an inhalation event, compared to a predefined pressure difference / drop limit or threshold. In such an embodiment, the results of both comparisons must be positive, i.e., the current inhalation must be of a duration that meets or exceeds the predefined length of time, and the pressure difference / drop must meet or exceed the predefined pressure difference / drop limit, for the device 102 to enable activation of the vaporizer 132 for aerosol generation. The pressure difference / drop of the inhalation can be detected by any suitable component. The pressure difference / drop limit can be predefined by the manufacturer or programmer, or in some embodiments, the user can be allowed to set their own pressure difference / drop limit, for example, during an initial setup process. The pressure difference / drop limit can be of any suitable magnitude. For example, the pressure difference / drop threshold can be 3 psi, more preferably 5 psi, more preferably 7 psi. However, the disclosure is not limited to these values.

[0145] According to one embodiment, the device 102 is configured to perform the inhalation duration comparison detailed above, and also to perform a comparison of the detected "inhalation volume" (which may alternatively be referred to as the "mass flow volume" of the inhalation) against a predefined inhalation volume limit or threshold. In such an embodiment, the results of both comparisons must be positive, i.e., the current inhalation must be of a duration that meets or exceeds the predefined length of time, and the inhalation volume must meet or exceed the predefined inhalation volume limit, for the device 102 to enable activation of the vaporizer 132 for aerosol generation. The inhalation volume may be detected by any suitable component. The inhalation volume limit may be predefined by the manufacturer or programmer, or in some embodiments, the user may be allowed to set their own inhalation volume limit, for example, during an initial setup process. The inhalation volume limit may be of any suitable magnitude. For example, the inhalation volume limit may be 10 milliliters per second (ml / s), more preferably 20 ml / s, and more preferably 30 ml / s. However, the present disclosure is not limited to these values.

[0146] In addition to comparing the inhalation duration to respective duration limits, the smoking substitution system may be configured to compare any two or more of (i) the detected pressure, (ii) the detected pressure differential / drop, or (iii) the inhalation volume / mass flow volume to respective limits or thresholds and require positive results from all (or, for example, from at least two) of those comparisons before activation of the vaporizer 132 for aerosol generation is permitted. The smoking substitution system may be configured to allow an authorized adult user to select which, if any, additional comparisons to make in addition to the inhalation duration comparison and / or to set limits or thresholds for those comparisons.

[0147] Although the improved aerosol generation system has been described above in relation to a closed-loop embodiment of a smoking replacement system comprising a device and a disposable component containing an aerosol precursor, the improvements described herein are not limited to such embodiments and may be used in any suitable aerosol generation system comprising an vaporizer, an airflow sensor, and a controller, the controller configured to activate the vaporizer only when the duration of inhalation by the user exceeds a predefined duration threshold, at least in certain circumstances and / or at least at certain times.

[0148] 5 shows an overview of an improved method that the improved aerosol generation system disclosed herein is configured to provide. Method 400 is configured to be performed by (or in place of) an aerosol generation system that includes a controller, an airflow sensor, and an evaporator, as detailed above.

[0149] The method 400 includes sensing a first inhalation by a user from the aerosol generation system as a first step 410. For example, the first inhalation by the user can be sensed by an airflow sensor.

[0150] In a second step 420, the method 400 includes determining the duration of the first inhalation by the user. This can be performed using an airflow sensor or controller, or any other suitable clock, timer, or processor.

[0151] In a third step 430, the method 400 includes comparing the duration of the first inhalation by the user to a predefined duration threshold. For example, this may be performed by the controller. The predefined duration threshold may be stored in any suitable memory associated with or in communication with the controller.

[0152] In an optional fourth step 440, the method 400 includes comparing one or more other parameters associated with the first inhalation by the user to respective predefined thresholds. For example, the parameters may be pressure, pressure differential (or pressure "drop") or mass flow volume (or "inhalation volume"), as detailed above.

[0153] In a fifth step 450, which is also optional and applies only if the optional fourth step 440 has been performed, the method 400 is allowed to proceed to a sixth step only if the parameters taken into account in the fourth step 440 exceed their respective predefined thresholds (i.e. only if the optional comparison step 440 yields a positive result).

[0154] In a sixth step 460, the method 400 includes activating the vaporizer only if the duration of the first inhalation by the user exceeds a predefined duration threshold.

[0155] Method 400 may be repeated for one or more subsequent inhalations by the user of the aerosol generating system, as detailed above in relation to the previous figures.

[0156] The improved aerosol generating system and improved method disclosed herein allow for improved safety and reduce the probability that an aerosol generating device, such as a smoking replacement device, will be used by unauthorized or inappropriate users, especially by children, such as young children. This is efficiently achieved by using components commonly found in aerosol generating and delivery systems, such as airflow sensors and controllers. Thus, enhanced safety is provided, but the overall cost, bulk, and complexity of the system is comparable to conventional systems. In at least some embodiments, the aerosol generating system can require multiple comparisons to be made and multiple positive results to be provided before activation of the vaporizer is permitted. Thus, multiple layers of safety can be provided, all associated with inhalation by the user. The components used to sense or detect parameters for which such comparisons are required are typically components that are routinely provided or can be provided in the aerosol generating system, and thus do not add to the overall cost or bulk or complexity of the system. However, despite the use of commonly available components, the improved aerosol generating systems disclosed herein provide improved safety by embodying the inventive recognition described herein of the inherent physical differences in characteristics that can be expected between authorized (adult) and unauthorized (minor, e.g., child) users during one or more inhalation events.

[0157] The controller can be configured to rapidly process parameters detected, sensed, or measured during (or associated with) an inhalation event if the characteristics of the inhalation meet predetermined limits or thresholds, including an inhalation duration threshold, such that an authorized user should not perceive any delay in inhaling prior to activation of the vaporizer, thereby providing for safe operation of an aerosol generating system, such as a smoking replacement system, in a manner convenient for the user.

[0158] While exemplary embodiments are described above, many equivalent modifications and variations will be apparent to those skilled in the art given this disclosure. Accordingly, the exemplary embodiments described above are considered to be illustrative rather than limiting.

[0159] Throughout this specification, including the claims which follow, unless the context otherwise requires, the words "have," "comprise," and "include," as well as variations such as "having," "comprises," "comprising," and "including," will be understood to imply the inclusion of a stated integer or step or group of integers or steps rather than the exclusion of other integers or steps or groups of integers or steps.

[0160] It should be noted that, as used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Ranges can be expressed herein as from "about" one particular value and / or to "about" another particular value. When such a range is expressed, another embodiment includes from the one particular value and / or to the other particular value. Similarly, when values ​​are expressed as approximations, by use of the prefix "about," it will be understood that the particular value forms another embodiment. The term "about" in connection with numerical values ​​is optional and means, for example, ±10%.

[0161] As used herein, the words "preferred" and "preferably" are used to refer to embodiments of the invention that may provide certain benefits, under some circumstances. It is to be understood, however, that other embodiments may also be preferred, under the same or different circumstances. Thus, reference to one or more preferred embodiments does not mean or suggest that other embodiments are not useful, and is not intended to exclude other embodiments from the scope of the disclosure or from the scope of the claims.

Claims

1. An aerosol generation system comprising an evaporator, an airflow sensor configured to detect inhalation by a user from the system, and a controller, wherein the controller is configured to activate the evaporator only when the duration of inhalation by the user exceeds a predefined duration threshold.

2. 10. The aerosol generation system of claim 1, further comprising a clock or timer configured to measure the duration of inhalation by the user.

3. 2. The aerosol generation system of claim 1, wherein the predefined duration threshold that the inhalation by the user must meet or exceed is 2 seconds or greater.

4. The aerosol generation system of claim 1 , further configured to activate the vaporizer only when a detected further inhalation parameter by the user exceeds a predefined further inhalation parameter threshold.

5. 5. The aerosol generation system of claim 4, wherein further inhalation parameters by the user are selected from one or more of the pressure of the inhalation by the user, the pressure difference / drop of the inhalation by the user, and the mass flow volume of the inhalation by the user.

6. 2. The aerosol generation system of claim 1, wherein the inhalation by the user is the first inhalation by the user, and the controller is configured to activate the vaporizer only when the duration of the first inhalation by the user exceeds the predefined duration threshold.

7. 7. An aerosol generating system according to claim 1, comprising a device for receiving a component for containing an aerosol precursor.

8. 8. The aerosol generating system of claim 7, further comprising the component for containing an aerosol precursor.

9. A method for controlling activation of an aerosol generation system, comprising: sensing inhalation by a user from the aerosol generation system using an airflow sensor; determining the duration of inhalation by the user; comparing the duration of inhalation by the user with a predefined duration threshold; and activating a vaporizer if the duration of inhalation by the user exceeds the predefined duration threshold.

10. 10. The method of claim 9, wherein the inhalation by the user is the first inhalation by the user.

11. 10. The method of claim 9, further comprising: determining one or more additional user inhalation parameters before activating the vaporizer; comparing the determined additional user inhalation parameters with a predefined additional user inhalation parameter threshold; and activating the vaporizer only if the additional user inhalation parameters exceed the predefined additional user inhalation parameter threshold.

12. 12. The method of claim 11, wherein the further user inhalation parameters are selected from one or more of the following: pressure of the user inhalation, pressure difference / drop of the user inhalation, and mass flow volume of the user inhalation.

13. A computer program having instructions configured, when executed by a processor or by an application installed on a mobile device, to cause the processor or application to perform the method of any one of claims 9 to 12.

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