39 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.

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.

Respiratory support and / or controlled mechanical ventilation of a patient are provided. A ventilation apparatus may include a ventilator, a transtracheal prosthesis, and a respiratory relief device. The transtracheal prostheses and ventilation catheter may be arranged such that the patient can breathe freely through the upper airway and / or the tracheal prostheses. Respiratory sensors may measure a breathing rate, lung pressure, airway pressure, or a combination thereof. Pulses of gas may be provided to the patient through the ventilation catheter during inspiration. The pulses may have a first volume while the patient breathes normal and a second volume when the sensors detect a cessation of breathing or reduction in breathing volume. The second volume may be provided at 1-5 times the normal breathing rate, with a volume 25-500% times the first volume, or both.

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.

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 method of an apparatus control pressure in the patient interface. A vent valve may be used with a respiratory device, where the vent valve may selectively block fluid communication between components, such as the flow generator, the patient interface, and / or the vent. An expiratory flow model may be used to determine an expiratory characteristic such as an expiratory flow rate or pressure in the patient interface where an indicative measure may not be available. The expiratory flow model may receive inputs based on a measure of the patient's respiration, such as the tidal volume, peak inspiratory flow rate or length of inspiration. The expiratory characteristic may be used by a controller to control a pressure in the patient interface to provide respiratory therapy to a patient at or close to a target pressure.

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.

The invention discloses a method for controlling pressure of an anesthesia machine and a breathing machine by using an expiration flow sensor. The method comprises the following steps of: (1) monitoring expiration flow by using an expiration flow monitoring sensor which is arranged at the expiration mouth of an expiration valve; (2) establishing a closed-loop proportion integration differentiation (PID) flow control system for the expiration valve and the expiration flow monitoring sensor; (3) grading expiration valve controlled flow PID control parameters according to required focus points in the grading range of 1LPM to 300LPM, and fitting the PID control parameters under flow values at the focus points by a curve fitting method or a broken line approximate method; (4) calculating suction valve controlled output flow and expiration valve controlled output flow under set control pressure according to a formula P=F*R; and (5) performing pressure feedback control on the anesthesia machine and the breathing machine in a suction valve and expiration valve cooperative control mode according to the suction valve controlled output flow and the expiration valve controlled output flow.

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 duringthe exhalation. Air trapping can be avoided, and it is possible to respond to changed exhalation parameters within one and the same phase of exhalation.

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.

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.

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.

The invention discloses a decontamination device for decontaminating inhaled and / or exhaled gases in a ventilator. The decontamination device comprises a gas inlet and outlet for inspiratory and expiratory gas flow, and a chamber for gas flow. The chamber is configured to connect the gas inlet and outlet. The chamber comprises at least one ultraviolet (UV) light source integrate inside the chamber that preferably emits in the UVC range, wherein the UV light source is preferably a UVC light-emitting diode. The UV light source is configured to produce UV light to decontaminate contaminants in the inhaled and / or exhaled gases by minimizing the distance between the contaminants in the gas flow and the light source, maintaining the gas flow in a gas flow path long enough to deactivate the contaminants, increasing the intensity of the light source to optimize decontamination, and increasing turbulence to redirect the gas flow and prevent boundary layers and shadowing.

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.

The invention provides ventilation equipment and an expiration flow correction method, and the correction method comprises the steps: in a current respiratory cycle, obtaining a first measurement signal output by a first flow sensor for detecting the expiration flow, and obtaining a second measurement signal output by a second flow sensor for detecting the expiration flow; the drift distance of the second flow sensor is inversely calculated according to the first measurement signal and the second measurement signal; correcting a second corresponding relation between the second measurement signal and the expiratory flow according to the drift distance; in the next respiratory cycle of the current respiratory cycle, the second flow sensor obtains a fourth flow value according to the corrected second corresponding relation and at least displays the fourth flow value; wherein the drift distance generated by the first flow sensor due to environment change is smaller than the drift distance generated by the second flow sensor due to environment change. According to the expiration flow correction method, the detection accuracy of the expiration flow can be effectively improved.

A ventilation control unit (100), regulating a gas flow (102) within a ventilation system (105), includes a reception module (120), first and second calculation modules (130, 135) and an output module (140). The reception module has a signal interface (122) receiving inspiratory and expiratory flow signals (125, 127) at regular time intervals. The first calculation module calculates a leak flow (132) based on a difference between the current inspiratory gas flow and the current expiratory gas flow, with an external gas flow source (110) separated from a ventilation circuit of the ventilation system. The second calculation module calculates an external gas flow (136) after connecting the external gas flow source to the ventilation circuit based on the leak flow and the difference between the current inspiratory gas flow and the current expiratory gas flow. The output module outputs an output signal (142), based on the external gas flow.

The present ventilator system, for detecting and treating concurrent chronic obstructive pulmonary disease (COPD) and obstructive sleep apnea (OSA event(s)) overlap syndrome, comprises a pressure generator for generating a pressurized flow of breathable gas for delivery to an airway of a subject; sensor(s) for generating output signals conveying information related to breathable gas parameters; and processor(s) operatively connected to the sensor(s) and the pressure generator, configured to: detect presence of OSA event(s) and / or expiratory flow limitation (EFL) in the subject based on the output signals. Responsive to detecting concurrent presence of OSA event(s) and EFL, the processors are configured to determine OSA EVENT(S) therapy parameters for treating the detected OSA event(s) in the subject; determine EFL therapy parameters for treating the detected EFL in the subject; determine a priority treatment based on a comparison between the OSA event(s) therapy parameters and the EFL therapy parameters; and control the pressure generator to deliver the determined priority treatment.

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 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.

The invention discloses an expiration pressure automatic titration method and system based on an expiration flow limited index; the method comprises the steps: in a maintenance stage, when a preset maintenance time is reached, calculating a current expiration flow limited index according to a negative expiration flow, an expiration peak flow and expiration time which are monitored in real time, and entering a regulation stage; determining whether the current expiratory flow limited index is smaller than the expiratory flow limited index at the end moment of the previous adjustment stage or not, and if yes, increasing the positive end expiratory pressure; if not, carrying out the operation of lowering the positive end expiratory pressure; and when the positive end expiratory pressure increasing operation or the positive end expiratory pressure decreasing operation is ended, recording the expiratory flow limitation index when the adjusting stage is ended. The exhaled air flow limitation index provided by the invention has vivid description significance and can be used as an indication of the actual exhaled air flow limitation degree; the method is relatively simple in calculation, does not need hardware support with high complexity requirements, and reduces the product cost.

The invention discloses a dynamic calibration device for a zero position of a flow sensor of an anaesthesia machine and a dynamic method thereof, and the device and method can achieve the zero calibration of an expiration flow sensor during inspiration and the zero calibration of the inspiration flow sensor during expiration, and achieve the real-time zero calibration of the anaesthesia machine during operation without shutdown for zero calibration. The zero calibration of the inspiration flow sensor and the expiration flow sensor can be completed in one ventilation period. The inspiration andexpiration are alternately carried out, zero calibration and measurement are also alternately carried out, the device can be immediately used for next flow measurement after zero calibration each time, even if zero drift occurs in the using process, zero drift can be immediately eliminated, and real-time, non-stop and dynamic zero calibration is truly achieved. The zero calibration is automatically carried out, manual operation is not needed, and zero calibration errors caused by human factors are eliminated.

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.