Vapor delivery systems and methods
There is provided an electronically controlled, breath actuated vaporization device for generating vaporized material for inhalation by a user. The vaporization device includes a vaporization chamber for accommodating material to be vaporized and a mesh heater or other heater supported upstream of the vaporization chamber which is operable to heat air that passes through the mesh heater or other heater during an inhalation event. A closed loop control scheme may be employed to control heat generated by the heater to maintain a temperature of the air delivered to the vaporization chamber at or within a predetermined tolerance of a desired vaporization temperature for at least a majority of a duration of the inhalation event.
1. A vaporization device for delivering vaporized material for inhalation by a user, the vaporization device comprising:
an air intake through which air enters the vaporization device during an inhalation event;
an outlet through which vapor is withdrawn from the vaporization device during the inhalation event;
a vaporization chamber for receiving material to be vaporized;
a heater positioned between the air intake and the vaporization chamber, and upstream of the vaporization chamber with respect to a flow of the air through the vaporization device during the inhalation event, and configured to heat the air which passes through the heater during the inhalation event as the air moves from the air intake toward the outlet;
a temperature sensor positioned downstream of the heater with respect to the flow of the air through the vaporization device during the inhalation event and configured to sense a temperature of the air downstream of the heater;
a pressure sensor positioned upstream of the heater with respect to the flow of the air through the vaporization device during the inhalation event; and
a control system operatively coupled to the temperature sensor and the heater to provide a closed loop control of heat generated by the heater to maintain a temperature of the air delivered to the vaporization chamber at, or within a predetermined tolerance of, a desired vaporization temperature for at least a majority of a duration of the inhalation event, wherein the control system includes one or more microprocessors and is configured to initiate a soft start in response to an initiation signal and to transition to the closed loop control upon detection of a thermal response that exceeds a threshold level or threshold rate of temperature change arising from inhalation by the user.
2. The vaporization device of claim 1 , wherein the pressure sensor is communicatively coupled to the control system to generate the initiation signal upon sensing a change in pressure associated with inhalation by the user.
3. The vaporization device of claim 1 , further comprising a trigger device accessible to the user to enable the user to generate the initiation signal.
4. The vaporization device of claim 1 , wherein the pressure sensor is configured to periodically measure the pressure throughout an inhalation event.
5. The vaporization device of claim 1 , wherein the pressure sensor is configured to continuously measure the pressure throughout an inhalation event.
6. The vaporization device of claim 1 , wherein the heater is configured to increase the temperature of air flow at least 100° C. per second.
7. The vaporization device of claim 1 , wherein the vaporization chamber is defined at least in part by a heat exchanger, the heat exchanger including a plurality of vapor flow passages extending between the vaporization chamber and the outlet.
8. The vaporization device of claim 7 , wherein the plurality of vapor flow passages in the heat exchanger comprise opposing passages offset from a central plane of the vaporization device, a central portion of the heat exchanger providing an obstruction around which the vapor flows to reach the outlet.
9. The vaporization device of claim 7 , wherein the vapor flow passages are configured to transfer heat from the vapor to the heat exchanger as the vapor moves toward the outlet.
10. The vaporization device of claim 9 , wherein the device is configured to transfer at least a portion of the heat transferred to the heat exchanger to an upstream location adjacent to the vaporization chamber.
11. The vaporization device of claim 7 , wherein a removable mouthpiece is coupled to the heat exchanger.
12. The vaporization device of claim 11 , wherein the vaporization chamber is selectively accessible without removing the mouthpiece.
13. The vaporization device of claim 1 , wherein the control system is configured to activate the heater at a 5% duty cycle upon a soft start.
14. The vaporization device of claim 1 , wherein the control system is configured to disable the heater upon cessation of the inhalation event.
15. The vaporization device of claim 1 , wherein the control system is configured to disable the heater upon detection of a divergence of a measured air temperature associated with a delivered heater power from an expected air temperature.
16. A vaporization device for delivering vaporized material for inhalation by a user, the vaporization device comprising:
an air intake through which air enters the vaporization device during an inhalation event; an outlet through which vapor is withdrawn from the vaporization device during the inhalation event;
a vaporization chamber for receiving material to be vaporized;
a heater positioned between the air intake and the vaporization chamber;
a temperature sensor positioned downstream of the heater with respect to a flow of the air through the vaporization device during the inhalation event;
a pressure sensor positioned upstream of the heater with respect to the flow of the air through the vaporization device during the inhalation event; and
a control system operatively coupled to the temperature sensor and the heater to provide a closed loop control of heat generated by the heater to maintain a temperature of the air delivered to the vaporization chamber at, or within a predetermined tolerance of, a desired vaporization temperature for at least a majority of a duration of the inhalation event.
17. The vaporization device of claim 16 , wherein the control system includes one or more microprocessors and is configured to initiate a soft start in response to an initiation signal and to transition to the closed loop control upon detection of a thermal response that exceeds a threshold level or threshold rate of temperature change arising from inhalation by the user.
18. The vaporization device of claim 16 , further comprising a vaporization head removably coupled to a base assembly comprising the temperature sensor, the control system, and a power source.
19. The vaporization device of claim 16 , wherein the vaporization chamber is defined at least in part by a heat exchanger, the heat exchanger including a plurality of vapor flow passages extending between the vaporization chamber and the outlet.
20. The vaporization device of claim 16 , wherein the pressure sensor is communicatively coupled to the control system to generate an initiation signal upon sensing a change in pressure associated with inhalation by the user.