A portable control device (10) for regulating a continuous oxygen flow to a user from an oxygen source, comprising: an inlet (11), to which the oxygen source may be fluidly connected; an outlet (12), to which a breathing device may be fluidly connected; a valve arrangement (20) fluidly connected to said inlet and to said outlet, said valve arrangement being adjustable between a maximum flow state corresponding to a maximum continuous flow of oxygen from the inlet to the outlet, and a minimum flow state corresponding to a minimum continuous flow of oxygen; and an actuator (13) movable between a maximum and a minimum position and being mechanically connected to the valve arrangement so that when said actuator is in the maximum position said valve arrangement is in the maximum flow state and when said actuator is in said minimum position said valve arrangement is in said minimum flow state.

This invention relates to, among other embodiments, methods and apparatus/systems for controlling gases delivery to a patient, such as via a patient interface. Such methods comprising receiving an input relating to either a patient's breathing phase and/or another patient parameter, controlling a flow of gases to be delivered to the patient and the inclusion in said flow of gases of a supplementary gas, wherein the amount of supplementary gas provided to the patient is substantially synchronized with respect to the patient's breathing phase and/or another patient parameter.

A fluid passage/stop body, component, housing and apparatus, a ventilation treatment device, and an oxygen supply control method. The fluid passage/stop body comprises a sliding plate and a flexible connecting member; the flexible connecting member is connected to the sliding plate; the flexible connecting member is used for connecting to a first channel wall of a first fluid channel of a fluid passage/stop apparatus; and the sliding plate is used for moving, driven by the pressure of a fluid in the first fluid channel, to drive the flexible connecting member to flexibly deform. The fluid passage/stop body is simple in structure, can drive, in actual use, a passage/stop member to safely and reliably achieve the passage/stop of a fluid, and can significantly improve, in a ventilation treatment device, the safety of oxygen supply of the ventilation treatment device.

A pneumatic oxygen conserver delivering a constant minute flow volume rate to a nasal mask, face mask, or nasal cannula is rendered lightweight by using tubing connected between the conserver and an oxygen source as a reservoir of oxygen for delivery to the nasal mask, face mask, or nasal cannula.

A system for providing ventilation support to a patient may include a ventilator, a control unit, a gas delivery circuit with a proximal end in fluid communication with the ventilator and a distal end in fluid communication with a nasal interface, and a nasal interface. The nasal interface may include at least one jet nozzle at the distal end of the gas delivery circuit; and at least one spontaneous respiration sensor for detecting respiration in communication with the control unit. The system may be open to ambient. The control unit may receive signals from the at least one spontaneous respiration sensor and determine gas delivery requirements. The ventilator may deliver gas at a velocity to entrain ambient air and increase lung volume or lung pressure above spontaneously breathing levels to assist in work of breathing, and deliver ventilation gas in a cyclical delivery pattern synchronized with a spontaneous breathing pattern.

Discloses are an electronic control circuit for alleviating altitude sickness and an oxygen supply device. The electronic control circuit includes an oxygen sensor installed in an oxygen supply channel, a breathing frequency sensor installed to the front of a head of a human body, and a microcontroller coupled to a control button, a flow proportion electromagnet, a bypass electromagnet and an air pump motor. The oxygen sensor and breathing frequency sensor detect analog signal and transmit the signal to the microcontroller after an analog-to-digital conversion, and an ON/OFF signal of the control button is transmitted to the microcontroller. The microcontroller has a flow control end coupled to a flow proportion electromagnet, a bypass control end coupled to a bypass electromagnet, and a pneumatic control end coupled to an air pump motor, and further includes a vibrating element electrically coupled to the microcontroller.

Systems and methods may include a gas source, a gas delivery circuit, and a nasal interface allowing breathing ambient air through the nasal interface. A gas flow path through the nasal interface may have a distal gas flow path opening. A nozzle may be associated with a proximal end of the nasal interface a distance from the distal end gas flow path opening. At least a portion of an entrainment port may be between the nozzle and the distal end gas flow opening. The nozzle may deliver gas into the nasal interface to create a negative pressure area in the gas flow path at the entrainment port. The nasal interface and the nozzle may create a positive pressure area between the entrainment port and the distal end gas flow path opening. Gas from the gas delivery source and air entrained through the entrainment port may increase airway pressure or lung pressure or provide ventilatory support.

Supplemental oxygen is used by millions of people each year in hospitals and at home. The device and methods described allow people on supplemental oxygen through a feedback loop to optimize their blood oxygen level by measuring oxygen and/or carbon dioxide and/or other related gases in the blood. Because the device and methods optimize the level of supplemental oxygen and/or carbon dioxide and/or other related gases, complications (from too much or too little oxygen and/or carbon dioxide) including death can be prevented. In addition, users can reduce their costs by reducing the amount of oxygen needed as well as labor costs. Additionally, helicopters, ambulance, and mobile surgical sites can reduce weight in critical situations. In addition, the device and methods described also allow patients on ventilators through a feedback loop to optimize ventilation by measuring carbon dioxide in the blood; which can reduce complications, and reduce labor costs. Finally, the device and methods provides a warning system when the oxygen supply is compromised, has or is exhausted.

Various equipment and methods associated with providing a concentrated product gas are provided. In one embodiment, the equipment includes an input device first and second sieve tanks, a variable restrictor, and a controller. In one embodiment, the method includes: a) selecting a desired output setting for the concentrated product gas from a plurality of output settings, b) separating one or more adsorbable components from a pressurized source gaseous mixture via first and second sieve tanks in alternating and opposing pressurization and purging cycles to form the concentrated product gas, and c) selectively controlling a variable restrictor based at least in part on the desired output setting to selectively provide flow between the first and second sieve tanks such that the flow for at least one output setting is different from the flow for at least one other output setting in relation to corresponding pressurization cycles.

A Moving Window Least Squares (MWLS) approach is applied to estimate respiratory system parameters from measured air flow and pressure. In each window, elastance E.sub.rs (or resistance R.sub.rs) is first estimated, and a Kalman filter may be applied to the estimate. This is input to a second estimator that estimates R (or E), to which a second Kalman filter may be applied. Finally, the estimated E.sub.rs and R.sub.rs are used to calculate muscle pressure P.sub.mus(t) in the time window. A system comprises a ventilator (100), an airway pressure sensor (112), and an air flow sensor (114), and a respiratory system analyzer (120) that performs the MWLS estimation. Estimated results may be displayed on a display (110) of the ventilator or of a patient monitor. The estimated P.sub.mus(t) may be used to reduce patient-ventilator dyssynchrony, or integrated to generate a Work of Breathing (WOB) signal for controlling ventilation.