The present disclosure is directed to systems and methods of providing a mixed-gas inhalant to a patient via a gas recirculation loop. The gas recirculation loop receives a first mixed-gas exhalant having a first carbon dioxide concentration from the patient, one or more carbon dioxide removal devices discharge a second mixed-gas exhalant having a second carbon dioxide concentration that is less than the first carbon dioxide concentration. The second mixed-gas exhalant is combined with a mixed-gas supply to provide a mixed-gas inhalant. The mied-gas supply includes a first gas and a second gas. The mixed-gas supply is pressure and flow controlled to produce a mixed-gas inhalant having a defined composition delivered to the patient at a defined volumetric flow rate. The first gas may include a gas containing oxygen and the second gas may include a gas mixture containing a noble or inert gas and oxygen.

A device and method for adjusting a tidal breath delivered to a patient. The device includes a moving frame which is configured to move over a stationary frame that is nested within the moving frame itself. Disposed between the moving frame and the stationary frame is a compressible bellows which delivers a tidal breath to the patient each time the moving frame is passed over the stationary frame. The specific volume of the tidal breath that is delivered may adjusted according to the estimated weight of the patient, thereby preventing over inflation of the patient's lungs while undergoing treatment. To adjust the tidal breath volume, the user quickly changes the relative position of a slide adjuster which dictates the range of possible movement between the moving frame and the stationary frame, thereby limiting the volume of air/oxygen which may be drawn into the bellows.

The disclosure provides a way to supplement the tidal volume delivered to the patient by a leaking re-breather when the delivered volume becomes less than that set by the ventilator (in either pressure-regulated or volume modes). This may be accomplished with a shunt—a gas conduit joining the non-patient side of the re-breather to the patient side. A low-resistance, plenum or a draw-over vaporizer may also be incorporated into the gas pathway. Such a device may include a housing with a movable partition separating an actuating side from a patient side. The housing includes a ventilator orifice for pneumatic communication between a ventilator and the actuating side and a patient orifice for pneumatic communication between the patient side and a patient. A shunt defines a bypass flow path from the actuating side and to the patient side when the moveable partition is at a maximal displacement towards the patient side.

The present disclosure provides techniques for a ventilator system with a removable airway. A ventilator system may include a removable airway and a base unit. The removable airway may include an air inlet port, a patient inhalation port, an air exhaust port, a patient exhalation port, a first portion of a pressure sensor, and a first portion of a flow sensor. The base unit may include two pinch valves, a second portion of the pressure sensor, and a second portion of the flow sensor. In some cases, the airway does not comprise any openings other than the air inlet port, the air exhaust port, the patient inhalation port, and the patient exhalation port. In some cases, air inside the removable airway does not contact any part of the base unit without first exiting the air exhaust port.

The respirator comprises an air bag that is pressurized to provide air to a user, wherein the air bag is a tubular membrane (2) housed within a pressure chamber (1). Furthermore, the pressure chamber (1) comprises fluid inlets and outlets, the fluid pressurizing the tubular membrane (2) to provide air to a user, and protrusions (9) that pressurize the tubular membrane (2). It provides a respirator with reduced dimensions, number of parts, weight, and cost, as well as reusable after autoclave disinfection of the auto-inflatable bag as a standard element.

The present disclosure provides techniques for a ventilator system with a removable airway. A ventilator system may include a removable airway and a base unit. The removable airway may include an air inlet port, a patient inhalation port, an air exhaust port, a patient exhalation port, a first portion of a pressure sensor, and a first portion of a flow sensor. The base unit may include two pinch valves, a second portion of the pressure sensor, and a second portion of the flow sensor. In some cases, the airway does not comprise any openings other than the air inlet port, the air exhaust port, the patent inhalation port, and the patient exhalation port. In some cases, air inside the removable airway does not contact any part of the base unit without first exiting the air exhaust port.

The invention provides a respiratory ventilation method and device, an anesthesia machine and a computer-readable storage medium. The respiratory ventilation device comprises a patient-end respiratory system, a machine-end respiratory system, a flow monitor and a processor. In some embodiments, the machine-end respiratory system comprises an intake branch at an inspiratory phase, a respiratory container, and an exhaust branch at an expiratory phase; and the intake branch and the exhaust branch are both connected to the respiratory container via the flow monitor, and the respiratory container is connected to the patient-end respiratory system.

The invention provides an anesthesia machine comprising a driving gas branched path, a fresh gas branched path, and a breathing circuit. The fresh gas branched path delivers fresh gas having anesthetic into the breathing circuit. The driving gas branched path drives fresh gas from the breathing circuit to a patient. The driving gas branched path comprises a fan assembly, which comprises a housing, a fan, and a heat-dissipating member. The fan is disposed in a first inner chamber, and drives air into the first inner chamber. The heat-dissipating member conducts to the housing the heat generated by the motor.

A patient ventilator system includes a patient delivery circuit having an inspiratory section that delivers an inspiratory gas flow to a patient and an expiratory section that receives expiratory gas flow from the patient, wherein a bidirectional blower motor drives the inspiratory gas flow in the inspiratory section and controls the expiratory gas flow in the expiratory section. A flow sensor measures gas flow rate between the bidirectional blower motor and the patient delivery circuit. A four quadrant controller is configured to control speed and direction of the bi-directional blower motor based on the measured flow rate so as to effectuate ventilation for the patient.

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.