A mask is disclosed that has a gas outlet which is quiet and provides for a diffused outlet flow of gases. The outlet is preferably a slot formed between a hollow body and cover over said hollow body. The mask also preferably extends and seals under a user's chin in use.

A mask is disclosed that has a gas outlet which is quiet and provides for a diffused outlet flow of gases. The outlet is preferably a slot formed between a hollow body and cover over said hollow body. The mask also preferably extends and seals under a user's chin in use.

Interfaces for positive pressure therapy having a mask assembly, a headgear assembly and a connection port assembly are disclosed herein. The connection port assembly has a ball joint connection with the mask assembly and includes a quick release button for easily disconnecting the gases source conduit from the mask assembly. The mask assembly may include a bias flow vent that is formed separately and attached to the mask assembly. The headgear assembly encircles the rear region of the user's head and may include at least some portions that are substantially non-stretchable.

Interfaces for positive pressure therapy having a mask assembly, a headgear assembly and a connection port assembly are disclosed herein. The connection port assembly has a ball joint connection with the mask assembly and includes a quick release button for easily disconnecting the gases source conduit from the mask assembly. The mask assembly may include a bias flow vent that is formed separately and attached to the mask assembly. The headgear assembly encircles the rear region of the user's head and may include at least some portions that are substantially non-stretchable.

Disclosed are methods, apparatus and systems for treating a respiratory disorder in a patient. The apparatus comprises a pressure generator configured to generate a flow of air so as to provide ventilatory support to the patient; a transducer configured to generate a flow signal representing a property of the flow of air; and a controller configured to analyse the flow signal to estimate the inspiratory volume and the expiratory volume of a breath of the patient and servo-control the degree of ventilatory support to adjust an estimated tidal volume toward a target tidal volume. A gain of the servo-control is dependent on a difference between the estimated inspiratory volume and the estimated expiratory volume. The method comprises operating an apparatus or system in a similar manner.

Disclosed are methods, apparatus and systems for treating a respiratory disorder in a patient. The apparatus comprises a pressure generator configured to generate a flow of air so as to provide ventilatory support to the patient; a transducer configured to generate a flow signal representing a property of the flow of air; and a controller configured to analyse the flow signal to estimate the inspiratory volume and the expiratory volume of a breath of the patient and servo-control the degree of ventilatory support to adjust an estimated tidal volume toward a target tidal volume. A gain of the servo-control is dependent on a difference between the estimated inspiratory volume and the estimated expiratory volume. The method comprises operating an apparatus or system in a similar manner.

The present technology relates to a patient interface for delivering breathable gas to a patient. The patient interface may comprise a cushion module including a plenum chamber. The plenum chamber may be substantially flexible. The plenum chamber may be configured so that a superior portion is able to move relative to an inferior portion in order to adjust an orientation of a superior portion of a seal-forming structure relative to an inferior portion of the seal-forming structure. The patient interface may further comprise a positioning and stabilising structure to provide a force to hold the cushion module in a therapeutically effective position on the patient's head. The positioning and stabilising structure may comprise a strap arranged so that the strap overlies the cushion module, the strap passes around the sides of the patient's head inferior to the patient's ears, and the strap overlies a posterior region of the patient's neck.

The present technology relates to a patient interface for delivering breathable gas to a patient. The patient interface may comprise a cushion module including a plenum chamber. The plenum chamber may be substantially flexible. The plenum chamber may be configured so that a superior portion is able to move relative to an inferior portion in order to adjust an orientation of a superior portion of a seal-forming structure relative to an inferior portion of the seal-forming structure. The patient interface may further comprise a positioning and stabilising structure to provide a force to hold the cushion module in a therapeutically effective position on the patient's head. The positioning and stabilising structure may comprise a strap arranged so that the strap overlies the cushion module, the strap passes around the sides of the patient's head inferior to the patient's ears, and the strap overlies a posterior region of the patient's neck.

A reusable apparatus, such as a medical instrument or tool, is decontaminated by applying pressure waves with direct contact of the pressure wave applicator to the reusable apparatus in an open bath in a sufficient dosage to remove contamination but without adversely affecting the ability to reuse the apparatus.

A reusable apparatus, such as a medical instrument or tool, is decontaminated by applying pressure waves with direct contact of the pressure wave applicator to the reusable apparatus in an open bath in a sufficient dosage to remove contamination but without adversely affecting the ability to reuse the apparatus.