37 results about "Expiratory gas flow" patented technology

The invention provides an improved ventilation method and method for controlling a ventilator apparatus in accordance with same. More specifically, the present invention relates to a method of controlling a ventilator apparatus comprising the steps of placing a ventilator in a mode capable of adjusting airway pressure (P) and time (T), monitoring expiratory gas flow, analyzing the expiratory gas flow over time (T) to establish an expiratory gas flow pattern, and setting and / or adjusting a low time (T2) based on the expiratory gas flow pattern. Alternatively, the present invention relates to a method of controlling a ventilator apparatus comprising the steps of placing a ventilator in a mode capable of adjusting airway pressure (P) and time (T), and setting a low airway pressure (P2) of substantially zero cmH2O.

A long term oxygen therapy system having an oxygen supply directly linked with a patient's lung or lungs may be utilized to more efficiently treat hypoxia caused by chronic obstructive pulmonary disease such as emphysema and chronic bronchitis. The system includes an oxygen source, one or more valves and fluid carrying conduits. The fluid carrying conduits link the oxygen source to diseased sites within the patient's lungs. A collateral ventilation bypass trap system directly linked with a patient's lung or lungs may be utilized to increase the expiratory flow from the diseased lung or lungs, thereby treating another aspect of chronic obstructive pulmonary disease. The system includes a trap, a filter / one-way valve and an air carrying conduit. In various embodiments, the system may be intrathoracic, extrathoracic or a combination thereof. In order for the system to be effective, an airtight seal between the parietal and visceral pleurae is required. Chemical pleurodesis is utilized for creating the seal.

This disclosure describes systems and methods for providing novel back-up ventilation. Further, this disclosure describes systems and methods for delivering ventilation when exhalation pressure and / or exhalation flow are unknown or unreliable by the ventilator.

A collateral ventilation bypass trap system directly linked with a patient's lung or lungs may be utilized to increase the expiratory flow from the diseased lung or lungs, thereby treating one aspect of chronic obstructive pulmonary disease. The system includes a trap, a filter / one-way valve, an air carrying conduit and a retention device for securing system elements in position. The system also includes a flow restriction device for controlling the flow of air through the air carrying conduit.

A system and a method for expiratory flow limitation (EFL) detection by controlling positive pressure (e.g., PEEP) applied during expiration for a subject is based on a temporary perturbation or adjustment of a pressure level of positive pressure during exhalation on selected breaths. The different responses to such a perturbation of flow-limited breaths compared to non-flow limited breaths is used to assess EFL in a subject. Automatic adjustments of the positive pressure applied to the patient are used in the disclosed algorithm to abolish EFL, and are implemented through existing ventilators and other respiratory devices.

A system for detecting EFL of a patient is provided. The system comprises an inhalation passage; an exhalation passage; a sensor for measuring flow-volume information of the exhaled air through an exhalation passage; a flow resistor positioned in the exhalation passage and being adjustable to provide an exhalation resistance in the exhalation passage; and a computer system. In one embodiment, oneor more physical processors of the computer system are programmed with computer program instructions which, when executed cause the computer system to: determine a reference expiratory flow-volume curve using flow-volume information of the exhaled air through the exhalation passage when a reference exhalation resistance is provided by the flow resistor in the exhalation passage; and determine a perturbed expiratory flow- volume curve using flow-volume information of the exhaled air through the exhalation passage when a lowered exhalation resistance is provided by the flow resistor in the exhalation passage.

An arrangement for passive gas sampling of a breathing gas in a breathing system allows sampling during both inspiration and expiration. The arrangement has a tube-piece having a first connector for receiving an inspiratory gas flow, a second connector for delivering an expiratory gas flow and a third connector for delivering the inspiratory gas flow and receiving the expiratory gas flow, a first port arranged between the second connector and the third connector and connected to a measurement chamber, a second port arranged between the first connector and the third connector and connected to the measurement chamber and a third port arranged between the first connector and the second connector and connected to the measurement chamber. The tube-piece is formed such that when an inspiratory flow passes through the tube-piece, a flow is established principally between the first port, the measurement chamber and the second port, and that when an expiratory flow passes through the tube-piece a flow is established principally between the third port, the measurement chamber and the first port.

Patient interfaces for respiratory therapy in the form of nasal interfaces or nasal masks include features that enhance or provide lateral stability of the interface. At least some of the embodiments provide multiple facial contact points or areas located in the general areas of the user's cheeks and / or upper lip. Some embodiments of the nasal interfaces provide advantageous sealing characteristics. The nasal interfaces may provide a controlled expiratory flow to reduce noise. Some embodiments include nasal pillows instead of or in addition to nasal prongs. The nasal pillows can have exhaust vents or can change in length in response to a pressure level within the nasal pillow.

The invention relates to a respiratory support method capable of dynamically adjusting flow and respiratory support equipment. The respiratory support method capable of dynamically adjusting flow comprises the following steps: acquiring expiration period characteristics of the respiratory support equipment in use; and according to the expiration period characteristics, carrying out expiration flowadjustment operation is in the expiration period. According to the respiratory support method provided by the invention, through a flow control mode capable of setting comfort, when the expiration ofthe patient is detected, the expiration flow is dynamically adjusted, so that the use comfort of a user is improved; and the flow is reduced according to the set comfort level, and then the flow is controlled in real time according to the detected expiration time of the patient, so that the use comfort of the patient is improved and the tolerance is improved under the condition that the use requirements of the patient are met.

This disclosure provides an apparatus, method and system for monitoring respiratory state. The apparatus includes an airflow sensor configured to monitor an exhalation flow of a subject, and a controller configured to determine whether the subject is experiencing an apnea according to the monitored exhalation flow and issue an alarm signal in response to determining that the subject is experiencing an apnea. Thereby, health problems caused by apnea are avoided.

The invention relates to the technical field of medical equipment, and discloses a respirator and a using method thereof. The respirator comprises an expiration flow sensor, an air supply flow sensorand a plurality of pressure sensors, a central processing unit, pressure adjusting equipment, an air supply gun and an exhalation valve, wherein the pressure sensors are used for measuring the air supply flow pressure and the expiration flow pressure and arranged on an air supply pipe and an expiration pipe; the central processing unit is used for receiving the data of the air supply flow sensor and the expiration flow sensor, comparing, integrating and calculating the data of the air supply flow and the expiration flow, and controlling the pressure adjusting equipment according to the integrated and calculated data and the data of the plurality of pressure sensors; the pressure adjusting equipment is used for adjusting the pressure of the air supply flow according to an instruction of thecentral processing unit and adjusting the pressure of the air supply flow; the air supply gun is used for conveying airflow with corresponding pressure according to data of the pressure adjusting equipment; and the exhalation valve is used for controlling and exhausting exhalation air flow. According to the respirator and the using method, the treatment success rate of the ARDS patient can be increased.

In certain embodiments, a ventilator may provide interactive guidance for obtaining a subject's expiratory flow limitation results. In some embodiments, the ventilator may cause a progressive color component to be presented, where the progressive color component indicates a progression from one color proximate one side of the progressive color component to another color proximate another side of the progressive color component. The ventilator may cause a forced oscillation to be continuously applied to an airway of the subject for a time period. The ventilator may monitor the subject's degree of expiratory flow limitation based on output signals generated by one or more sensors as the forced oscillation is continuously applied for the time period. The ventilator may cause, based on the monitoring, a movable component's position on the progressive color component to be continuously updated during the time period to indicate the degree of expiratory flow limitation.

The system comprises an oxygen supply device; one or more sensors configured to generate an output signal conveying information about whether the patient is in an inspiration phase or an expiration phase; one or more valves; and a computer system. The one or more valves have: a) a first configuration in which the one or more valves operate to recover an excess flow of oxygen-enriched breathing gas during an inspiration phase; and b) a second configuration in which the one or more valves discharge the patient's expiratory flow to the atmosphere during the expiratory phase. The one or more physical processors are programmed with computer program instructions that, when executed, cause the computer system to provide input to the one or more valves based on the output signal, the provided input causing the one or more valves to move between the first and second configurations.

The invention relates to a method and device for calibrating an expiratory flow sensor of an anesthesia apparatus. The method comprises: enabling a simulated lung disposed on the anesthesia apparatus to inhale through the anesthesia apparatus; recording tidal volume provided to the simulated lung by the anesthesia apparatus; recording a reading of the expiratory flow sensor when the simulated lung exhales; and calculating an expiratory flow value corresponding to a point value to be calibrated, according to the tidal volume, the reading and a preset point value to be calibrated.

A method and apparatus for of assessing the blood concentration level in a human or animal subject, of a volatile blood constituent (preferably alcohol) is disclosed. The method comprises steps of positioning a sensor (21, 22) within the expiratory gas flow of the subject, wherein the sensor (21, 22) is configured to detect the presence of the constituent and provide a first output signal representative of the concentration of said constituent in air, and also to detect a presence of carbon dioxide and to provide a second output signal representative of the concentration of carbon dioxide in air. The flow of expiratory gases from the subject is sampled to provide a first signal and second signal in respect of the expiratory gases substantially simultaneously. The method also comprises the step of inputting said first and second signals obtained by the sampling step into an algorithm configured to compare the variation of the first signal over time with the variation of the second signal over time and, depending on the result of the comparison, to make said second signal representative of the degree of dilution of said expiratory airflow. The invention further includes an apparatus for carrying out the method.

A method controls an expiratory gas flow at a user interface (16) of a ventilator (1) wherein the user interface (16) has an exhalation valve (11), which provides a positive end-expiratory pressure (PEEP). The method includes the following steps during a phase of exhalation: changing the positive end-expiratory pressure from a basic PEEP value (31) with the exhalation valve (11); returning the positive end-expiratory pressure to the basic PEEP value (31) with the exhalation valve (11); and determining an exhalation parameter. The method permits an adaptive change in the expiratory flow during the exhalation. Air trapping can be avoided, and it is possible to respond to changed exhalation parameters within one and the same phase of exhalation.