Controlling a respiratory support system

1 . A control system for controlling a respiratory support system for supplying therapy gas to a subject, the control system comprising:

processing circuitry communicatively coupled to an interface for receiving an indication of a combination of the subject's head orientation and torso orientation,

wherein the indication is based on orientation data provided by a sensing system configured to detect the subject's head orientation and torso orientation;

wherein the interface is further configured to receive an arousal indication and

a machine-readable medium storing instructions which, when executed by the processing circuitry, cause the processing circuitry to:

identify, from parameter information associated with each of a set of different combinations of head orientation and torso orientation, a parameter value of the therapy gas for the respiratory support system to use in supplying the therapy gas to the subject for the indicated combination of the subject's head orientation and torso orientation; and cause the respiratory support system to supply the therapy gas with the identified parameter value; and

in response to receiving the arousal indication, cause the respiratory support system to supply therapy gas with the parameter value at a default value, and vary the parameter value at a predefined rate until reaching the parameter value identified for the indicated combination of the subject's head orientation and torso orientation.

2 . The control system of claim 1 , wherein the indication is configured to indicate whether the subject's head orientation and torso orientation are the same or different.

3 . The control system of claim 1 , wherein the indication comprises information indicative of the subject's head orientation being different to the subject's torso orientation.

4 . The control system of claim 1 , wherein the head orientation is one of: a supine head orientation or non-supine head orientation, wherein the torso orientation is one of: a supine torso orientation or non-supine torso orientation.

5 . The control system of claim 4 , wherein the parameter value to use is a default parameter value when the indicated combination comprises the supine head orientation and the supine torso orientation, and wherein the parameter value to use is different to the default parameter value when the indicated combination comprises at least one of: a non-supine head orientation and/or non-supine torso orientation.

6 . The control system of claim 1 , wherein: a first parameter value from the parameter information is associated with a first combination of the set of different combinations of head orientation and torso orientation, wherein the first combination is where the head orientation is supine and the torso orientation is supine; a second parameter value from the parameter information is associated with a second combination of the set of different combinations of head orientation and torso orientation, wherein the second combination is where the head orientation is supine and the torso orientation is non-supine; a third parameter value from the parameter information is associated with a third combination of the set of different combinations of head orientation and torso orientation, wherein the third combination is where the head orientation is non-supine and the torso orientation is supine; and a fourth parameter value from the parameter information is associated with a fourth combination of the set of different combinations of head orientation and torso orientation, wherein the fourth combination is where the head orientation is non-supine and the torso orientation is non-supine.

7 . The control system of claim 1 , wherein the instructions are configured to cause the processing circuitry to record, for use in the parameter information, the parameter value for each of the set of different combinations of head orientation and torso orientation, wherein the recorded parameter value is established to reduce a likelihood of the subject experiencing a respiratory disturbance.

8 . The control system of claim 7 , wherein the parameter value is established from a polysomnography, PSG, titration study conducted for each of the set of different combinations of head orientation and torso orientation.

9 . The control system of claim 7 , wherein the parameter value is established by the respiratory support system, wherein the respiratory support system is configured to: determine the parameter value needed to reduce the likelihood of the subject experiencing the respiratory disturbance for each of the set of different combinations of head orientation and torso orientation; and output the determined parameter value associated with each of the set of different combinations of head orientation and torso orientation for use in the parameter information.

10 . The control system of claim 1 , wherein the instructions are configured to cause the processing circuitry to: identify, from the indication, a change in the head orientation and/or torso orientation; and in response to the change, identify the parameter value of the therapy gas for the respiratory support system to use in supplying the therapy gas to the subject for the indicated change in the head orientation and/or torso combination based on the parameter information.

11 . The control system of claim 1 , wherein the indication of a combination of the subject's head orientation and torso orientation is provided by at least one of: an orientation sensor of the sensing system; and/or an imaging device of the sensing system, wherein the image device is configured to image at least one of the subject's head and/or torso.

12 . The control system of claim 1 , wherein the interface is further configured to receive the arousal indication produced by an arousal detection system operatively associated with the subject, wherein the arousal detection system is configured to detect a change in sleep state of the subject and output the arousal indication in response to detecting the change.

13 . A patient support system, comprising: the control system of claim 1 ; a respiratory support system for supplying therapy gas to the subject.

14 . A computer-implemented method of controlling a respiratory support system for supplying therapy gas to a subject, the method comprising:

receiving an indication of a combination of the subject's head orientation and torso orientation,

wherein the indication is based on orientation data provided by a sensing system configured to detect the subject's head orientation and torso orientation;

identifying, from parameter information associated with each of a set of different combinations of head orientation and torso orientation, a parameter value of the therapy gas for the respiratory support system to use in supplying the therapy gas to the subject for the indicated combination of the subject's head orientation and torso orientation;

and causing the respiratory support system to supply the therapy gas with the identified parameter value; and

receiving an arousal indication; in response to receiving the arousal indication, causing the respiratory support system to supply therapy gas with the parameter value at a default value; and

varying the parameter value at a predefined rate until reaching the parameter value identified for the indicated combination of the subject's head orientation and torso orientation.

15 . A non-transitory machine-readable medium storing instructions which, when executed by processing circuitry, cause the processing circuitry to implement the method of claim 14 .