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AutoSet technology
The treatment pressure required by your patient may vary due to changes in sleep state, body position
and airway resistance. In AutoSet mode, the device provides only that amount of pressure required to
maintain upper airway patency.
The device analyzes the state of your patient’s upper airway on a breath-by-breath basis and delivers
pressure within the allowed range according to the degree of obstruction. The AutoSet algorithm adjusts
treatment pressure as a function of three parameters: inspiratory flow limitation, snore, and apnea.
Normal airway
When your patient is breathing normally, the inspiratory flow measured by the device as a function of
time shows a typically rounded curve for each breath.
Open unrestricted airway
Time
Flow
Inspiration
Unrestricted inspiratory flow-time curve (rounded)
Flow limitation
As the upper airway begins to collapse, the shape of the inspiratory flow-time curve changes. The S9
recognises and treats traditional as well as less common flow-limited breath wave forms.
Silent partial airway obstruction
Time
Flow
Flattened inspiratory flow-time curve
(denoting partial obstruction)
Snore
Snoring is sound generated by vibrations of the walls of the upper airway. It is often preceded by flow
limitation or a partial obstruction of the airway.
Noisy partial airway obstruction
Time
Flow
Snore superimposed on inspiratory flow-time curve
368220.indb 6 6/09/2011 9:21:27 AM
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