Differential pressure sensor for an aerosol delivery device

• US 11,039,645 B2
• Filed: 09/19/2017
• Issued: 06/22/2021
• Est. Priority Date: 09/19/2017
• Status: Active Grant

• Current Assignee: RAI STRATEGIC HOLDINGS, INC. (British American Tobacco PLC)
• Original Assignee: RAI STRATEGIC HOLDINGS, INC. (British American Tobacco PLC)
• Inventors: Sur, Rajesh
• Primary Examiner(s): Ross, Dana
• Assistant Examiner(s): Chen, Kuangyue
• Application Number:
  US15/708,898
• Publication Number:
  US 20190082736A1
• Time in Patent Office: 1,372 Days
• Field of Search: 392404
• CPC Class Codes: A24F 40/10 Devices using liquid inhalable precursors
• CPC Class Codes: A24F 40/51 Arrangement of sensors
• CPC Class Codes: A61M 11/042 electrical
• CPC Class Codes: A61M 15/001 using ultrasonic means
• CPC Class Codes: A61M 15/06 Inhaling appliances shaped like cigars, cigarettes or pipes
• CPC Class Codes: A61M 2205/3334 Measuring or controlling the flow rate
• CPC Class Codes: A61M 2205/3358 Measuring barometric pressure, e.g. for compensation
• CPC Class Codes: A61M 2205/3368 Temperature
• CPC Class Codes: A61M 2205/3561 local, e.g. within room or hospital
• CPC Class Codes: A61M 2205/581 by audible feedback
• CPC Class Codes: A61M 2205/583 by visual feedback
• CPC Class Codes: A61M 2205/8206 battery-operated
• CPC Class Codes: F22B 1/284 with water in reservoirs
• CPC Class Codes: G01L 9/0042 Constructional details associated with semiconductive diaphragm sensors, e.g. etching, or constructional details of non-semiconductive diaphragms details about the integration or bonding of piezoresistor in or on the diaphragm G01L9/0052 and G01L9/0057 respectively
• CPC Class Codes: H05B 1/0297 Heating of fluids for non specified applications

Abstract

An aerosol delivery device includes at least one housing, a heating element, a sensor, and a microprocessor coupled to the heating element and the sensor. The at least one housing encloses a reservoir configured to retain an aerosol precursor composition. The sensor is configured to produce measurements of differential pressure between an ambient atmospheric pressure and a pressure caused by airflow through at least a portion of the aerosol delivery device. The sensor is also configured to convert the measurements of differential pressure to corresponding electrical signals. The microprocessor is configured to receive the corresponding electrical signals and operate in an active mode only in an instance in which the differential pressure is at least a threshold differential pressure. The microprocessor in the active mode is configured to control the heating element to activate and vaporize components of the aerosol precursor composition.

Claims

1. An aerosol delivery device comprising:

at least one housing enclosing a reservoir configured to retain an aerosol precursor composition;

a heating element;

a sensor configured to produce measurements of differential pressure between an ambient atmospheric pressure and a pressure caused by airflow through at least a portion of the aerosol delivery device, the sensor being configured to convert the measurements of differential pressure to corresponding electrical signals and being operable in a frequency mode selectable from a plurality of frequency modes; and

a microprocessor coupled to the heating element and the sensor, the microprocessor being configured to select and thereby control the frequency mode of the sensor and to receive corresponding electrical signals and operate in an active mode only in an instance in which the differential pressure is at least a threshold differential pressure, the microprocessor in the active mode being configured to control the heating element to activate and vaporize components of the aerosol precursor composition, wherein the plurality of frequency modes includes a first frequency mode and a second frequency mode, the first frequency mode being at a higher frequency with lesser power consumption by the sensor and lower resolution of the measurements relative to the second frequency mode at a lower frequency with greater power consumption by the sensor and higher resolution of the measurements.

2. The aerosol delivery device of claim 1, wherein the sensor is a microelectromechanical systems-based (MEMS-based) sensor.

3. The aerosol delivery device of claim 1, wherein the sensor is a multidirectional electromechanical pressure sensor configured to produce measurements of differential pressure based on pressure on the sensor in different directions.

4. The aerosol delivery device of claim 1, wherein the sensor and the microprocessor are potted in a waterproof material to thereby make the sensor and the microprocessor waterproof or resistant to water, aerosol precursor composition or vaporize components of the aerosol precursor composition.

5. The aerosol delivery device of claim 1, wherein the microprocessor is responsive to electrical signals having only a predetermined frequency of the corresponding electrical signals from the sensor to prevent electrical signals having other frequencies from devices external to the aerosol delivery device from causing the microprocessor to operate in the active mode.

6. A control body coupled or coupleable with a cartridge to form an aerosol delivery device, the cartridge including a reservoir configured to retain an aerosol precursor composition, and equipped with a heating element controllable to activate and vaporize components of the aerosol precursor composition, the control body comprising:

a housing; and

within the housing,

a sensor configured to produce measurements of differential pressure between an ambient atmospheric pressure and a pressure caused by airflow through at least a portion of the control body, the sensor being configured to convert the measurements of differential pressure to corresponding electrical signals and being operable in a frequency mode selectable from a plurality of frequency modes; and

a microprocessor coupled to the heating element and the sensor when the control body is coupled with the cartridge, the microprocessor being configured to select and thereby control the frequency mode of the sensor and to receive the corresponding electrical signals and operate in an active mode only in an instance in which the differential pressure is at least a threshold differential pressure, the microprocessor in the active mode being configured to control the heating element to activate and vaporize components of the aerosol precursor composition, wherein the plurality of frequency modes includes a first frequency mode and a second frequency mode, the first frequency mode being at a higher frequency with lesser power consumption by the sensor and lower resolution of the measurements relative to the second frequency mode at a lower frequency with greater power consumption by the sensor and higher resolution of the measurements.

7. The control body of claim 6, wherein the sensor is a microelectromechanical systems-based (MEMS-based) sensor.

8. The control body of claim 6, wherein the sensor is a multidirectional electromechanical pressure sensor configured to produce measurements of differential pressure based on pressure on the sensor in different directions.

9. The control body of claim 6, wherein the sensor and the microprocessor are potted in a waterproof material to thereby make the sensor and the microprocessor waterproof or resistant to water, aerosol precursor composition or vaporize components of the aerosol precursor composition.

10. The control body of claim 6, wherein the microprocessor is responsive to electrical signals having only a predetermined frequency of the corresponding electrical signals from the sensor to prevent electrical signals having other frequencies from devices external to the control body from causing the microprocessor to operate in the active mode.

11. An aerosol delivery device comprising:

a sensor configured to produce measurements of differential pressure between an ambient atmospheric pressure and a pressure caused by airflow through at least a portion of the aerosol delivery device, the sensor being configured to convert the measurements of differential pressure to corresponding electrical signals and being operable in a frequency mode selectable from a plurality of frequency modes; and

a microprocessor coupled to the sensor, and configured to select and thereby control the frequency mode of the sensor and to receive the corresponding electrical signals and operate in an active mode only in an instance in which the differential pressure is at least a threshold differential pressure, the microprocessor in the active mode configured to cause an aerosol production component to activate and produce an aerosol from an aerosol precursor composition, wherein the plurality of frequency modes includes a first frequency mode and a second frequency mode, the first frequency mode being at a higher frequency with lesser power consumption by the sensor and lower resolution of the measurements relative to the second frequency mode at a lower frequency with greater power consumption by the sensor and higher resolution of the measurements.

12. The aerosol delivery device of claim 11, wherein the sensor is a microelectromechanical systems-based (MEMS-based) sensor.

13. The aerosol delivery device of claim 11, wherein the sensor is a multidirectional electromechanical pressure sensor configured to produce measurements of differential pressure based on pressure on the sensor in different directions.

14. The aerosol delivery device of claim 11, wherein the sensor and the microprocessor are potted in a waterproof material to thereby make the sensor and the microprocessor waterproof or resistant to water, aerosol precursor composition or aerosol.

15. The aerosol delivery device of claim 11, wherein the microprocessor is responsive to electrical signals having only a predetermined frequency of the corresponding electrical signals from the sensor to prevent electrical signals having other frequencies from devices external to the aerosol delivery device from causing the microprocessor to operate in the active mode.