An anesthesia machine includes a gas mixer providing gas for delivery to a ventilated patient and a breathing system. The breathing system includes a reusable ventilation portion and a disposable circle portion. The reusable ventilation portion includes a mechanical ventilation section, a manual ventilation section, a ventilation port, and switch configured to switch between connection of the mechanical ventilation section and the manual ventilation section to drive patient ventilation. The disposable circle portion includes a vent connector that connects to the ventilation port, an inspiratory channel, and a gas intake port providing anesthetic gas from the gas mixer to the inspiratory channel. The disposable circle portion further includes an expiratory channel, a CO.sub.2 absorber, and a filter positioned in a flow path between the expiratory port and the vent connector and between the CO.sub.2 absorber and the vent connector. The filter is configured to prevent moisture and bacteria from entering the reusable ventilation portion of the breathing system.

An anesthetic breathing apparatus and system, having a patient circle system for re-breathing exhaled gases by a patient a volume reflector, a fresh gas delivery line, and a gas sensor unit arranged to measure a gas stream upstream a fresh gas connection and downstream said reflector unit. The gas sensor unit provides a signal for detection of a reflector driving gas (RDG) crossing over the volume reflector during inspiration based on at least one property of the gas stream measured by the gas sensor unit. Appropriate action may be taken based on this measurement, for instance in disclosed methods.

This invention relates to a patient interface, a system and/or method for providing a dedicated or sole inspiratory line or conduit for provision of inspiratory gases to a patient, and a dedicated sole expiratory line or conduit for provision of expiratory gases to a downstream device, where the inspiratory line or conduit is sealing engageable with first of a user's nares and the expiratory line or conduit is sealing engageable with the second of a user's nares.

An anesthesia ventilator, for the automated ventilation of a patient, includes an expiratory port and an inspiratory port for connecting a patient ventilation tube for a breathing gas, a breathing gas delivery unit, a breathing gas volume flow sensor, a breathing gas sensor for detecting a carbon dioxide concentration, a pressure sensor for detecting a pressure of the breathing gas, and a computer. The computer is configured to actuate the breathing gas delivery unit in a first mode of operation as a function of a preset ventilation rate, of the detected pressure and of a preset desired pressure value. The computer is configured to detect the presence of a desired operating state concerning the automated ventilation on the basis of the detected volume flow and of the detected carbon dioxide concentration and to make possible a transition to a second mode of operation in case of detection.

A system for tracking anesthetic agent in a vaporizer reservoir includes a mass flow sensor configured to measure a flow rate entering or exiting a vaporizer chamber, a gas pressure sensor configured to measure a pressure of a mixed gas provided from the vaporizer chamber, a gas temperature sensor configured to measure a temperature of the mixed gas provided from the vaporizer chamber, and an agent time module executable on a processor. The agent time module is configured to calculate a remaining agent time based on at least the gas flow rate, the pressure of the mixed gas, the temperature of the mixed gas, and an anesthetic concentration in the mixed gas. The remaining agent time is then provided for display on a display device.

Methods and systems are provided for an oxygen sensor included in a medical gas flow device, such as an anesthesia machine. In one embodiment, a method for a medical gas flow device comprises tracking an output voltage of an oxygen sensor during calibration over time, and, responsive to the output voltage decreasing by at least threshold amount from an initial calibration output voltage, estimating an end-of-life date of the oxygen sensor and outputting a replacement notification.

A patient ventilation system includes a ventilator configured to deliver ventilation gas to patient, a CO.sub.2 concentration sensor configured to provide EtCO.sub.2 measurements for the patient, and an SpO.sub.2 monitor configured to determine an SpO.sub.2 value for the patient. A ventilation control module is executable on a processor and configured to compare the SpO.sub.2 value to a threshold SpO.sub.2 and determine from this comparison that the SpO.sub.2 value indicates inadequate oxygenation. A minimum ventilation amount is then set, and the ventilator is then controlled based on the EtCO.sub.2 measurements and the minimum ventilation amount so as to deliver at the least the minimum ventilation amount to the patient while the SpO.sub.2 value indicates inadequate oxygenation.

Described herein are methods and systems for delivering an analgesic to a patient. The systems and methods including a breathing bag that has an outer shell, which creates a hollow inter cavity. The breathing bag also has an opening at first end, and an opening secured by a check valve at a second end. A tube, or set of tubes, may then be attached to the breathing bag, such that at least one aperture along a portion of the tube is housed within the breathing bag. The check-valve of the breathing bag having an inlet, an outlet, an air passage, a tube attachment, and a flapper. Gas can then pass through the apertures, into the breathing bag, and out to the patient via the check valve.

This invention relates to a patient interface, a system and/or method for providing a dedicated or sole inspiratory line or conduit for provision of inspiratory gases to a patient, and a dedicated or sole expiratory line or conduit for provision of expiratory 5 gases to a downstream device, where the inspiratory line or conduit is sealing engageable with the first of a user's nares and the expiratory line or conduit is sealing engageable with the second of the user's nares.

Aspects discussed herein relate to remixing devices that can be used to modify a gas mix being inhaled by a user. The device can accurately adjust inspired CO.sub.2 and/or O.sub.2 levels independently to a desired level. Aspects described herein generally improve the quality, efficiency, and speed of devices to provide breathing gas mixes. Medical conditions can be diagnosed and a therapeutically effective gas mix can be provided as treatment for diagnosed medical conditions.