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 expiratory time in controlled mechanical ventilation varies a subject's expiratory times; determines gas volumes exhaled by the subject per breath associated with the expiratory times; establishes a stable condition of the gas volumes; 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.

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.

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.

A method sets a subject's expiratory time based on the subject's natural exhalation time, when the subject's natural exhalation flow ceases, and / or when the subject's tidal volume is expired. Another determines the subject's natural exhalation time, when the subject's natural exhalation flow ceases, and / or when the subject's tidal volume is expired, and sets the subject's expiratory time based on the determination. In addition, a flow rate sensor determines the subject's natural exhalation time, when the subject's natural exhalation flow ceases, and / or when the subject's tidal volume is expired, and bases the subject's expiratory time on the determination.

The invention comprises a ventilation apparatus and method for operating a ventilator of a ventilator apparatus, wherein in the method at least one duration ratio factor is set in a computing system of the ventilator apparatus; at least one minute volume, at least one functional dead space volume and at least one time constant are determined; a respiration frequency is computed, based on a previously defined lung model, depending on said determined parameters, where said computed respiration frequency is optimized on at least one minimum of a delivered parameter, which is induced to a patient using said ventilator; an inspiratory time and an expiratory time are determined based on said computed respiration frequency and said duration ratio factor; at least one tidal volume based on said previously computed respiration frequency and said determined minute volume is computed; and a delivered respiratory parameter of the ventilator is closed loop controlled.

The invention comprises a ventilation apparatus and method for operating a ventilator of a ventilator apparatus, wherein in the method at least one duration ratio factor is set in a computing system of the ventilator apparatus; at least one minute volume, at least one functional dead space volume and at least one time constant are determined; a respiration frequency is computed, based on a previously defined lung model, depending on said determined parameters, where said computed respiration frequency is optimized on at least one minimum of a delivered parameter, which is induced to a patient using said ventilator; an inspiratory time and an expiratory time are determined based on said computed respiration frequency and said duration ratio factor; at least one tidal volume based on said previously computed respiration frequency and said determined minute volume is computed; and a delivered respiratory parameter of the ventilator is closed loop controlled.

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 relates to a pneumatic air-controlled ventilator. The pneumatic air-controlled ventilator uses gas as the power source, and the high-pressure gas forms periodic work through the pneumatic valve to supply the patient with an appropriate tidal volume and respiratory rate. The pneumatic air-controlled ventilator only needs to be connected to the air source, and the patient's appropriate respiratory rate and tidal volume can be supplied through the pressure reducing valve and control valve of the pneumatic air-controlled ventilator itself. The control valve of the pneumatic air-controlled ventilator can control the respiratory frequency and tidal volume adjustment. When the pressure of the normally open valve control air chamber rises to the set value, close the normally open valve, and the control gas in the normally closed valve control air chamber is discharged from the air resistance at the same time as the normally open valve is closed, and the normally closed valve resumes closing state, then stop the air supply at the rear end of the normally closed valve, the time period from this moment to the next normally closed valve ventilation is the patient’s exhalation time, and the process from inhalation to exhalation is completed, and the pneumatic air-controlled ventilator works in a cycle like this.

The invention relates to a mechanical PEEP valve of a medical first-aid breathing machine. The mechanical PEEP valve comprises a valve body, a movable blocking piece mechanism and a control mechanism,wherein the movable blocking piece mechanism comprises a round blocking piece; the blocking piece is arranged in an expiration channel of the valve body through a rotating shaft in the radial direction of the blocking piece; the blocking piece is driven by the control mechanism to be switched between the initial state and the turnover state; in the initial state, the blocking piece is parallel tothe axis direction of the expiration channel; in the turnover state, the blocking piece is perpendicular to the axis direction of the expiration channel; the control mechanism comprises a power source, a signal induction assembly and a transmission assembly; an airflow sensor is electrically connected with the power source through a control line; and the power source is in transmission connectionwith a rotating shaft in the movable blocking piece assembly through the transmission assembly. By means of the mechanical PEEP valve, smooth exhausting can be achieved without obstruction at the initial expiration stage of a patient, the flow of the expiration channel can be reduced at the later expiration stage, and therefore resistance is applied to expiration of the patient, the expiration time is prolonged, the oxygenation time is prolonged, and the oxygenation state is improved.

The invention provides an inhaling holding method for an electrically powered electrically controlled ventilator. The method comprises the following steps of: setting the electrically powered electrically controlled ventilator into a volume controlled ventilation working mode, and setting inhaling holding parameters; obtaining target inhaling time and target exhaling time during the ventilation of inhaling holding according to the inhaling holding parameters and the preset conventional respiratory parameters; and performing ventilation control according to the target inhaling time, the targetexhaling time, the inhaling holding parameters and the conventional respiratory parameters. The inhaling holding method is applicable to the situation that the ventilator is in transit and has no compressed air sources, does not need medical staff to stay for operation, simplifies the manual operation of realizing an inhaling holding function, and ensures that the medical staff who perform lung function radiography are free from physical injury caused by high-intensity radiation, so the inhaling holding method solves the problems that a pneumatically powered electrically controlled ventilatorin the prior art fails to be used under the condition of transit or no compressed air sources and has adverse effect on the health of the medical staff who perform lung function radiography.

The invention relates to a breathing switching based breathing machine pressure control method and a breathing machine. The breathing switching based breathing machine pressure control method comprises the steps that gas flow data of the breathing machine is acquired, an expiration time point corresponding to an expiration inflection point of a user during expiration in each expiration period is determined according to the acquired gas flow data; whether a breathing state of the user is rapid breathing or normal breathing is judged based on the gas flow data corresponding after the expiration time point within the same expiration period, and whether an inspiration time point when the user begin to inspire corresponding in a breathing period is determined according to a judgement result; a breathing machine pressure is controlled based on the gas flow data corresponding to the expiration time point in each breathing period and the gas flow data corresponding to the inspiration time point. The breathing switching can accurately control the breathing machine pressure, discomfort brought to the user in the using process is avoided, and the usage experience of the user is improved.