Devices for delivering a controlled concentration of an agent are provided. The device includes a reservoir for the agent and a flow control portion operably connected to the reservoir. The device also includes a valve for releasing the agent from the flow control portion and a pump for flowing air to mix with the agent released by the valve and for flowing the agent and air mixture out of the device. Methods of delivering a vaporized agent to a subject are also provided. The methods include storing a liquid agent in a reservoir of a device and flowing the agent into a flow control chamber to change the agent to a gas. The methods also include mixing the agent in gas form with air and flowing the agent and air mixture out of the device to be delivered to a subject.

Supplying therapeutic gas based on inhalation duration. At least some of the example embodiments are methods including: sensing a current inhalation of the patient; providing a flow of therapeutic gas to the patient based on the sensing; and ceasing the flow of therapeutic gas to the patient based on a value indicative of previous inhalation duration.

The principles and embodiments of the present invention relate to methods and systems for safely providing NO to a recipient for inhalation therapy. There are many potential safety issues that may arise from using a reactor cartridge that converts NO.sub.2 to NO, including exhaustion of consumable reactants of the cartridge reactor. Accordingly, various embodiments of the present invention provide systems and methods of determining the remaining useful life of a NO.sub.2-to-NO reactor cartridge and/or a breakthrough of NO.sub.2, and providing an indication of the remaining useful life and/or breakthrough.

A method includes receiving data associated with a sleep session of a user. The method also includes determining that the user is experiencing or has experienced an event based at least in part on the data. The method also includes causing pressurized air to be directed from a respiratory device to a multi-compartment bladder in response to determining that the user is experiencing or has experienced the event to aid in modifying a position of a head of the user.

A respiratory ventilators system having an inlet configured to be connected to a pressurized air or gas source; an outlet configured to be connected to a patient interface; a valve in-line between the inlet and the outlet; and a control unit configured to control the valve for controlling flow of pressurized air or gas from the source to the patient, wherein the valve includes an air or gas reservoir or accumulator incorporated into the valve body.

A gas-driven, pressure-regulated ventilator (10, 210) provides support for spontaneous breathing and non-breathing patients. The ventilator provides short pressure cycled and constant flow ventilatory support that allows the patient to receive consistent and reliable ventilatory breaths. The ventilator is designed to allow a clinician to adjust Peak Inspiratory Pressure (PIP) and Positive End Expiratory Pressure (PEEP) values and the duration of inhalation and exhalation flows in a breath cycle to accommodate patient-specific ventilation needs.

An absorption arrangement (100) includes a CO2 absorber (4) and a water trap (2). Such an absorption arrangement (100) is used with a process for filtering carbon dioxide from a gas mixture by absorption. The gas mixture flows from a source through the absorption arrangement (100) to a sink in the following way: through a supply fluid guide unit (3), through a lower deflecting fluid guide unit (9), through the CO2 absorber (4), through an upper deflecting fluid guide unit (6), through a connecting fluid guide unit (33), through the water trap (2) and through a discharge fluid guide unit (34). The gas mixture flows vertically or obliquely upward through the CO2 absorber (4) and vertically or obliquely downward through the connecting fluid guide unit (33) to the water trap (2).

A system for detecting manual ventilation and selectively delivering a high flow of oxygen. The system comprises a source of compressed oxygen coupled to a first lumen of a nasal cannula, with an oxygen flow control valve coupled to a processor to control the flow of oxygen to the nasal cannula. A second lumen of the nasal cannula is in connection with a pressure sensor and the pressure sensor in connection with the processor. The processor may receive the pressure values and be programmed to determine when manual ventilation has occurred, and send a signal to the oxygen flow control valve to send a high flow of oxygen in response to manual ventilation.

A therapeutic gas source and cart and methods thereof for use with a therapeutic gas delivery system is disclosed. The therapeutic gas source may include a cylinder operable to contain a therapeutic gas that includes a body and a gas source valve body. In some examples, the gas source valve body has a valve and a coupling member.

A method and a system for determining the amount of oxygen required by a user with respiratory problems are disclosed. First data about several users with respiratory problems is stored in a database. The method a) collects second data from a monitored user while (s)he is performing a test at a first location; b) computes a user’s behavioral model executing a first algorithm on the first and second data; c) collects, every period of time t1, third data of the user while (s)he is performing an activity at a second location; d) adjusts, every period of time t2, the computed user’s behavioral model using the first algorithm, providing a customized user’s behavioral model as a result; and e) computes an estimator of the quantity of oxygen to be delivered to the user by executing a second algorithm on the customized user’s behavioral model.