31 results about "Expiratory Time" patented technology

A method of operating a CPAP apparatus in which the interface pressure is controlled to rapidly drop at the start of expiration by an expiratory relief pressure (ERP) that is independent of instantaneous respiratory flow, following which the pressure rises to an inspiratory level at or shortly before the end of expiration, or at the onset of an expiratory pause, if any. The ERP is an increasing function of the inspiratory pressure. The expiratory pressure follows a template that is a function of the expected expiration time, the magnitude of the template being equal to the ERP. The current estimated proportion of expiration is determined by comparing the expiration time of the breath in progress to low-pass filtered expiratory durations measured for a number of the preceding breaths.

A method of setting inspiratory time, expiratory time, and a subject's breath size in controlled mechanical ventilation comprises: a) setting a subject's expiratory time; b) setting the subject's inspiratory time; and c) setting the subject's breath size, all based on various criteria.

A method of setting expiratory time in controlled mechanical ventilation sets a subject's expiratory time based on when the subject's natural exhalation flow ceases. Another method determines when the subject's natural exhalation flow ceases and sets the subject's expiratory time based on the determination. A device for use in controlled mechanical ventilation comprises a flow rate sensor configured to determine when a subject's natural exhalation flow ceases and bases the subject's expiratory time on the determination.

A method of setting expiratory time in controlled mechanical ventilation sets a subject's expiratory time based on the subject's natural exhalation time. Another method determines the subject's natural exhalation time and sets the subject's expiratory time based on the determination. A device for use in controlled mechanical ventilation comprises a flow rate sensor configured to determine a subject's natural exhalation time and base the subject's expiratory time on the determination.

It has been discovered that high amplitude, low frequency, broadband spectrum pressure oscillations of sufficient time duration can help stabilize lung volumes and improve gas exchange in a patient receiving ventilation assistance by helping to recruit and stabilize alveoli. A novel device is presented which can produce pressure oscillations having high amplitudes, a low broad-band frequency spectrum and long time duration. Additionally, the device can maintain a patient's mean airway pressure at one or more controlled levels. The device can control the oscillatory amplitude, frequency range and composition, time duration, and mean airway pressure levels by adjusting certain device parameters, such as the angle and depth of the device in a fluid. A device and mechanical system for remotely adjusting and measuring the angle of the device in a fluid are also disclosed. Furthermore, a device and system are disclosed that can deliver pressure oscillations having high amplitudes, a low broad-band frequency spectrum, long time duration, and multiple mean airway inspiratory and expiratory pressure levels. The device and system also provide means for controlling respiration timing in a patient, including: breaths per minute, inspiratory time, and the ratio of inspiratory to expiratory time.

Provided is a device for attachment to the head of a horse to enable recording of respiratory sounds in the intensely exercising animal, e.g., in a breezing Thoroughbred racehorse. Also provided are methods for predicting racing performance in a horse, e.g., a Thoroughbred race horse, comprising measuring expiratory and/or inspiratory times for a subject horse during exercise and relating such information to anatomy, front leg stance times and/or front leg stance distances and/or to speed (velocity) to determine the animal's potential to sustain a superior rate of ground coverage for a desired amount of time and identify a maximum comfortable velocity for the animal. A presently preferred embodiment of the methods of the invention comprises predicting performance via identification of expiratory time determined directly from the analysis of recorded respiratory sound from the exercising animal.

A method of setting expiratory time in controlled mechanical ventilation varies a subject's expiratory times; determines end tidal gas concentrations associated with the expiratory times; establishes a stable condition of the gas concentrations; and determines an optimal expiratory time based on a deviation from the stable condition. A device for use in controlled mechanical ventilation comprises means for the same.

Continuous measurement of breathing impedance with extremely high precision is enabled by executing noise elimination. A loudspeaker 21 applies an air vibration pressure by an oscillation wave to an oral cavity, the oscillation wave being obtained by frequency-culling so executed that the oscillation wave has only the frequency component that is left after the culling is executed from a plurality of different frequencies and being generated by a pulse signal for pulse drive with pulses made positive and negative separately in correspondence to the time of exhalation and the time of inhalation. A pressure inside the oral cavity is detected and a breathing flow is detected, and a signal obtained by the detection is Fourier-transformed by a Fourier transforming means 32 to obtain a spectrum. A breathing high frequency component that contributes as a noise is obtained by an extracting means 33, using a spectrum that corresponds to a frequency component culled from the result of the Fourier transformation. This breathing high frequency component is subtracted from a spectrum that corresponds to a frequency component left by the culling to extract an oscillation wave component. Computing of dividing a pressure component by a flow component for each of frequencies for the result of this extraction is executed by a computing means 34 to obtain breathing impedance.

At least an expiratory period during which a user is instructed to take an expiratory action as a respiratory action and an inspiratory period during which the user is instructed to take an inspiratory action as the respiratory action are set. One of enlargement and reduction of a first object is performed during the expiratory period, and the other of the enlargement and the reduction of the first object is performed during the inspiratory period, the first object representing a loop path. During the expiratory period, a second object is caused to move along and complete one full circuit of the path in a time from a beginning to an end of the expiratory period, and during the inspiratory period, the second object is caused to move along and complete one full circuit of the path in a time from a beginning to an end of the inspiratory period.

The invention relates to a respirator (10) for the at least supportive respiration of living beings (12), wherein the respirator comprises the following: a connection formation for connection to a breathing gas supply; a breathing gas conduit arrangement (30); a pressure change arrangement (16) for changing the pressure in the breathing gas conduit arrangement (30); a flow sensor (44), which provides a flow signal (50) representing a breathing gas volume flow in the breathing gas conduit arrangement (30), a control unit (18) controlling the operation of the respirator (10). Said control unit is designed to trigger a transition from an expiratory to an inspiratory operation of the respirator (10), whenever an increase in the steepness of a flow signal curve (50) exceeds a steepness change threshold value (58). According to the invention, the control unit (18) is configured to detect the steepness change threshold value (58) depending on an expiratory time constant of the respective patient (12) to be ventilated, and to trigger the transition from an expiratory to an inspiratory operation of the respirator (10), whenever the increase in the steepness of the flow signal curve (50) exceeds the steepness change threshold value (58) determined in accordance with the expiratory time constant.

The invention relates to a pneumatic gas-controlled breathing machine which takes gas as a power source. High-pressure gas forms periodic operation through a pneumatic valve so as to supply a proper tidal volume and breathing frequency for a patient. The pneumatic gas-controlled breathing machine only needs to be connected with the gas source so as to supply the proper tidal volume and breathing frequency for the patient through a reducing valve and a control valve of the pneumatic gas-controlled breathing machine self, and the control valve of the pneumatic gas-controlled breathing machine can adjust the breathing frequency and the tidal volume. A normally open valve is closed when the normally open valve controls the pressure of a gas cavity body to rise to a set value, control gas in the gas cavity body is controlled by a normally closed valve and is discharged from an air-resistor simultaneously when the normally open valve is closed, and the normally closed valve recovers to be in the closed state, so that gas supply at the rear end of the normally closed valve is stopped, the time slot from the moment to the next time of ventilation of the normally closed valve is the time for the patient to breathe, and then the process from inhaling to exhaling of the patient is finished. The pneumatic gas-controlled breathing machine works repeatedly in the way.

The invention discloses a method for adjusting tidal volume under an IPPV mode. The method comprises the following steps: 1) setting tidal volume, inspiration and expiration ratio, and respiratory frequency, according to the following formula, calculating inspiratory flow of an inhalation valve, inspiratory flow = set tidal volume / inspiratory time, inspiratory time=60 / respiratory frequency x (inspiratory time / (inspiratory time + expiratory time)); 2) through the inspiratory flow, according to a corresponding table of inhalation valve voltage and flow velocity, obtaining threshold voltage of the inhalation valve, after an expiration period, according to the following formula, calculating overall tidal volume, overall tidal volume = system compliance / (system compliance - pipeline compliance) x set tidal volume; 3) according to the following formula, calculating actual tidal volume, actual tidal volume = overall tidal volume - tidal volume consumed by a pipeline; 4) according to the difference value of the set tidal volume and the actual tidal volume, through adjusting inspiratory flow, adjusting the threshold voltage of the inhalation valve, so as to adjust the overall tidal volume. The method is simple and feasible.

The invention discloses a device for assisting respiration aerosol gas and a method for regulating the respiration aerosol gas. When the device is used for inhalation, atomizing gas is triggered to be generated, and the atomizing gas and absorbed air enter the respiratory tract synchronously. A one-way exhalation valve is arranged on an exhalation opening, exhalation resistance is regulated through the one-way exhalation valve, positive end-expiratory pressure is generated, exhalation time is prolonged, the time of the aerosol gas in the respiratory tract is guaranteed, the aerosol gas can be absorbed, and meanwhile gas of the lung can be fully exhaled. An inhalation flow limiter is arranged on a gas inlet connecter, the ratio of the sprayed aerosol gas to non-aerosol gas is regulated through the inhalation flow limiter, proper inhalation flow speed and enough long inhalation time are guaranteed, it is guaranteed that aerosol medicine is fully inhaled into the lung, and the curative effect is achieved.

The invention relates to an intelligent adjustable one-way exhaust device, which includes a valve body, a valve cover, an air inlet, an outlet, an exhaust, a control chamber, a reversing chamber, an exhaust chamber and a reversing spool. The invention provides a reversible pressure breathing valve between a non-invasive ventilator and a face mask; when the patient inhales, the ventilator providespositive pressure gas to the patient, Guaranteeing patient airway openness, so that that patient is smoothly inhale, patient expiratory time, At that same time, an air outlet with adjustable open sizeis arranged on the breathe valve, so as to maintain a certain pressure in the respiratory tract of the patient by adjusting the size of the air outlet, thereby avoiding the occurrence of respiratorytract collapse, so that the non-invasive ventilator with single-loop air supply can meet the needs of the patient with lung problems.

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 relates to a mechanical PEEP valve and an emergency ventilator with the PEEP valve. The mechanical PEEP valve comprises a valve body, a movable separation blade mechanism and a control mechanism. The movable separation blade mechanism comprises at least two separation blades, the separation blades are arranged in an expiration channel of the valve body through rotating shafts, the separation blades are driven by the control mechanism to be switched between an initial state and an overturning state, the separation blades and the axial direction of the expiration channel are parallel to each other in the initial state, and the separation blades and the axial directions of the expiration channel are perpendicular to each other in the overturning state; the control mechanism comprises a driving motor, a signal induction assembly and an adjustable transmission assembly. The driving motor can drive all or part of the rotating shafts to rotate through the adjustable transmissionassembly. The mechanical PEEP valve can make a patient have a smooth expiration without obstruction in the initial stage of expiration, and can reduce the flow of the expiration channel in the laterstage of expiration, so that resistance is applied to the expiration of the patient, expiration time is prolonged, oxygenation time is prolonged, and an oxygenation state is improved.

The invention discloses a forced expiration total amount prediction method, which comprises the following steps: S1, according to a forced lung function prediction standard, collecting forced lung function test data, and sorting and classifying the data to obtain a data set; and S2, constructing a forced expiration total amount prediction model, and outputting a forced expiration total amount prediction result by using the prediction model. The method has the beneficial effects that by providing the forced expiration total amount prediction method, a tester can still obtain an FVC value under the condition that the whole test is not completed, so that the problem that the diagnosis effect is influenced due to the fact that an FVC detection result does not meet the acceptability because it is difficult for the tester to insist in expiration time long enough is effectively solved.

A method of setting expiratory time in controlled mechanical ventilation sets a subject's expiratory time based on when the subject's tidal volume expires. Another method determines when the subject's tidal volume expires and sets the subject's expiratory time based on the determination. A device for use in controlled mechanical ventilation comprises a flow rate sensor configured to determine when a subject's tidal volume expires and bases the subject's expiratory time on the determination.