A patient interface for delivering breathable gas to a patient includes a sealing portion including a nose tip engagement portion adapted to form a seal with the patient's nose tip, an upper lip engagement portion adapted to form a seal with the patient's upper lip and/or base of the patient's nares, and nostril engagement flaps adapted to form a seal with the patient's nares. The nose tip engagement portion, the upper lip engagement portion, and the nostril engagement flaps are all structured to extend or curve outwardly from a supporting wall defining an air path.

A flexible patient cassette that can be optimized for different types of breathing circuits, different drive circuits and different patient categories has a first inlet arranged to be connected to a drive circuit, and at least a second inlet arranged to be connected to a patient connector, the first and second inlets being pneumatically connected with each other through a gas conducting passage constituting a patient circuit having a certain volume. The patient cassette has a volume-varying arrangement for varying the patient circuit volume to allow that volume to be varied in dependence of at least one of the type of breathing circuit in which the patient cassette is used, the type of drive circuit to which the patient cassette is connected, and the tidal volume of a patient connected to the patient connector.

A reservoir configured to retain a volume of liquid for use in an apparatus for humidifying a flow of pressurized air comprises a base portion and a lid portion. The reservoir may be configured to improve its level of thermal contact to the heater plate using the flow of pressurized air. The reservoir may be configured to improve thermal contact between the reservoir and the heater plate by pre-compression upon engagement of the reservoir with the humidifier. The reservoir may comprise a removable intermediate portion, which may include the inlet tube and/or the outlet tube, for improved access for cleaning. The reservoir may also be configured to prevent overfilling. Overfill prevention features in the reservoir may include defined flow egress paths and/or formation of air locks.

A breathing assistance apparatus includes an inner volumetric member pressurizable from a first pressure to a second pressure and an outer volumetric member surrounding at least a portion of the inner expandable volumetric member. The inner volumetric member pressurizes the outer volumetric member as the inner volumetric member is pressurized from the first pressure to the second pressure. In another embodiment, a breathing assistance apparatus includes exhalation and inhalation chambers with respective biasing members providing for the exhalation chamber to apply a pressure to the inhalation chamber and thereby provide assisted inhalation. Methods for assisting breathing are also provided.

A choking intervention device for clearing a foreign object obstructing a breathing passage of a choking victim includes an assembly of one or more hollow vessels and a facemask configured to enclose a person's mouth and nose. The assembly includes a plurality of vessels configured to create a low-pressure environment within the assembly. The assembly contains a bottom opening which provides access to the low-pressure interior. The facemask is coupled to the bottom of the assembly and is configured to enclose the choking victim's mouth and nose. The body of the assembly is further of proper size and shape to allow an ordinary individual the ability to hold and use the assembly with one hand. Operation of this device has the unique advantage of pressing toward the victim which facilitates the creation of an airtight seal between the facemask and the victim's face.

Some embodiments relate to a respiratory support device for use with an inflatable and deflatable cartridge. The device can include a cartridge receiving portion for removably attaching to the inflatable and deflatable cartridge; and an actuating mechanism configured for selectively inflating and deflating the inflatable and deflatable cartridge, when received in the cartridge receiving portion.

The invention belongs to the field of medical sciences and respiratory masks. It is a cardiopulmonary resuscitation device that delivers assisted ventilation via a foot- or compressor-controlled bellows mechanism. This device frees the use of the hand used to compress the conventional self-inflating Airway Mask Bag Unit (AMBU), so that the free hand can be used to fit the mask over the patient's face and reduce the mechanical fatigue generated by the manual compression of current mechanisms. The unit attaches to ventilation masks, can have a frequency meter and is compatible with accessories comprising conventional cardiopulmonary resuscitation devices; inside it has a valve that controls the filling of the oxygen reservoir and the time at which oxygen is released to be supplied to the patient.

A patient interface for delivering breathable gas to a patient includes a sealing portion including a nose tip engagement portion adapted to form a seal with the patient's nose tip, an upper lip engagement portion adapted to form a seal with the patient's upper lip and/or base of the patient's nares, and nostril engagement flaps adapted to form a seal with the patient's nares. The nose tip engagement portion, the upper lip engagement portion, and the nostril engagement flaps are all structured to extend or curve outwardly from a supporting wall defining an air path.

A pressure support system configured to provide pressure support therapy to a subject is described. The pressure support system comprises a humidifier configured to control the humidity of gas provided to the subject during a sleep cycle to ensure an amount of liquid will remain in the humidifier at the conclusion of an estimated usage time. The pressure support system is configured to ensure humidified breathing gas is delivered to a subject during a usage time within a pressure support usage period. During times when the subject's moisture demand is greater than amount of moisture available in the humidifier, the pressure support system may decrease the amount moisture in the breathing gas so humidified therapy is available during the entire time the user is asleep.

A patient interface for delivering breathable gas to a patient includes a sealing portion including a nose tip engagement portion adapted to form a seal with the patient's nose tip, an upper lip engagement portion adapted to form a seal with the patient's upper lip and/or base of the patient's nares, and nostril engagement flaps adapted to form a seal with the patient's nares. The nose tip engagement portion, the upper lip engagement portion, and the nostril engagement flaps are all structured to extend or curve outwardly from a supporting wall defining an air path.