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Devices and systems provide methods of controlling breathable gas generation such as for a respiratory treatment and/or for controlling ionization of the gas. In an example, a controller of a respiratory treatment apparatus controls generation of a supply of ionized air. The apparatus may include a

Devices and systems provide methods of controlling breathable gas generation such as for a respiratory treatment and/or for controlling ionization of the gas. In an example, a controller of a respiratory treatment apparatus controls generation of a supply of ionized air. The apparatus may include a flow generator to generate a flow of pressurized breathable gas. The flow generator may be adapted for connection with a respiratory interface. The apparatus may also include an ionizer to ionize the flow of gas. The controller may be coupled with the ionizer and the flow generator and be configured to control the ionizer to programmatically change levels of ionization of the gas. Such ionized gas treatments may be suitable for helping users to sleep or improving respiratory oxygen absorption, and may be for patients with, for example, sleep disordered breathing or chronic obstructive pulmonary disease.

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1. A respiratory treatment apparatus for generating a controlled supply of ionized breathable gas comprising: a flow generator to generate a flow of breathable gas at a pressure above atmospheric pressure, the flow generator adapted for connection with a patient respiratory interface;an ionizer to i

1. A respiratory treatment apparatus for generating a controlled supply of ionized breathable gas comprising: a flow generator to generate a flow of breathable gas at a pressure above atmospheric pressure, the flow generator adapted for connection with a patient respiratory interface;an ionizer to ionize the flow of breathable gas at a level of ionization;a controller, including a processor, the controller coupled with the ionizer and the flow generator, the controller configured to control the ionizer to programmatically change the level of ionization of the pressurized flow of breathable gas to set the level to a plurality of different ionization levels; anda sensor coupled with the controller, the sensor configured to detect a physiological characteristic, wherein the controller is configured to change the level of ionization based on the detection of the physiological characteristic. 2. The apparatus of claim 1 wherein the controller is configured to decrease the level of ionization over a period of time. 3. The apparatus of claim 1 wherein the controller is configured to increase the level of ionization over a period of time. 4. The apparatus of claim 1 wherein the controller is further configured to pulse the level of ionization over a period of time. 5. The apparatus of claim 1 wherein the controller is configured to decrease the level of ionization after expiration of a wake period. 6. The apparatus of claim 1 wherein the physiological characteristic comprises detected sleep. 7. The apparatus of claim 1 wherein the controller is configured to adjust the level of ionization based on the detection of a sleep state. 8. The apparatus of claim 7 wherein the level of ionization is reduced based on the detection of a deep sleep state and/or a rapid eye movement (REM) sleep state. 9. The apparatus of claim 1 wherein the physiological characteristic comprises a detected respiratory event. 10. The apparatus of claim 9 wherein the detected respiratory event comprises a detected inspiratory cycle. 11. The apparatus of claim 1 wherein the controller is further configured to turn on and turn off the ionizer while continuing to control the flow generator to generate the flow of breathable gas. 12. The apparatus of claim 1 further comprising a filter to attract charged contaminants from the ionized flow of breathable gas. 13. The apparatus of claim 12 wherein the filter is an electret filter. 14. The apparatus of claim 1 wherein the ionizer is located proximate to the flow generator and the apparatus further comprising a secondary ionizer, the secondary ionizer located proximate to the patient respiratory interface, whereby the ionizer may promote cleaning of the breathable gas and secondary ionizer may promote inhalation of ionized gas. 15. The apparatus of claim 1 further comprising a humidifier, the humidifier having a gas flow input in gas flow communication to a gas flow output of the ionizer. 16. The apparatus of claim 1 wherein the ionizer comprises an array of ion generators and wherein the controller is configured to selectively activate different portions of the array. 17. The apparatus of claim 1, wherein the processor is configured to control the flow generator to programmatically set the flow of breathable gas at the pressure above atmospheric pressure. 18. The apparatus of claim 17 wherein the controller controls the flow of breathable gas to maintain a target ventilation. 19. The apparatus of claim 17 wherein the controller controls the flow of breathable gas to set the pressure above atmospheric pressure to alleviate events of sleep disordered breathing. 20. The apparatus of claim 1 further comprising an ion sensor to generate a signal indicative of a level of ionization of the ionized gas, wherein the controller is configured to control the ionizer to change the level of ionization based on a measure of ionization from the ion sensor. 21. The apparatus of claim 1 further comprising a delivery conduit to couple between the flow generator and patient respiratory interface, the delivery conduit having a material with a flow surface charge state to repel the ionized breathable gas. 22. The apparatus of claim 21 wherein the delivery conduit further comprises a charge element to set a charge state of the delivery conduit to repel the ionized breathable gas. 23. A control method of a respiratory treatment apparatus for generating a controlled supply of ionized breathable gas, the control method comprising: generating with a flow generator a flow of breathable gas at a pressure above atmospheric pressure;ionizing with an ionizer the flow of breathable gas at a level of ionization;controlling, with a processor, a change to the level of ionization of the flow of breathable gas to set the ionization to a plurality of different ionization levels; anddetecting with a sensor a physiological characteristic, wherein the change to the level of ionization is based on the detection of the physiological characteristic. 24. The method of claim 23 wherein the change to the level of ionization is a decrease of the level of ionization over a period of time. 25. The method of claim 23 wherein the change to the level of ionization is an increase of the level of ionization over a period of time. 26. The method of claim 23 wherein the change to the level of ionization comprises pulsing of the level of ionization over a period of time. 27. The method of claim 23 wherein the change to the level of ionization comprises a decrease of the level of ionization after expiration of a wake period. 28. The method of claim 23 wherein the physiological characteristic comprises detected sleep. 29. The method of claim 23 wherein the change to the level of ionization comprises adjusting the level of ionization based on the detection of a sleep state. 30. The method of claim 28 wherein the level of ionization is reduced based on the detection of a deep sleep state and/or Rapid Eye movement (REM) sleep state. 31. The method of claim 23 wherein the physiological characteristic comprises a detected respiratory event. 32. The method of claim 31 wherein the detected respiratory event comprises a detected inspiratory cycle. 33. The method of claim 23 further comprising turning on and turning off the ionizer while continuing to control the flow generator to generate the flow of breathable gas. 34. The method of claim 23 further comprising filtering the ionized flow of breathable gas to attract charged contaminants from the ionized flow of breathable gas. 35. The method of claim 34 wherein the filter is an electret filter. 36. The method of claim 23 wherein the ionizing is performed proximate to the flow generator and secondary ionizing is performed proximate to a patient respiratory interface. 37. The method of claim 23 further comprising humidifying the ionized breathable gas. 38. The method of claim 23 wherein the ionizer comprises an array of ion generators and selectively activating different portions of the array. 39. The method of claim 23 wherein the processor controls the flow generator to programmatically set the flow of breathable gas at the pressure above atmospheric pressure. 40. The method of claim 39 wherein the processor controls the flow of breathable gas to maintain a target ventilation. 41. The method of claim 39 wherein the processor controls the flow of breathable gas to set the pressure above atmospheric pressure to alleviate events of sleep disordered breathing. 42. The method of claim 23 further comprising generating a signal indicative of a level of ionization of the ionized gas with an ion sensor, and controlling, with the processor, the ionizer to change the level of ionization based on a measure of ionization from the ion sensor. 43. The method of claims 23 further repelling the ionized breathable gas with a delivery conduit, the delivery conduit adapted to couple between the flow generator and a patient respiratory interface, the delivery conduit having a material with a flow surface charge state to repel the ionized breathable gas. 44. The method of claim 43 further comprising charging with a charging element the delivery conduit, the charging element to set a charge state of the delivery conduit to repel the ionized breathable gas.