106 results about "Medical ventilator" patented technology

A medical ventilator system and method that triggers, cycles, or both based on patient effort, which is determined from cross-correlating patient flow and patient pressure. The medical ventilator is also controlled such that sensitivity to a patient initiated trigger increases as the expiratory phase of the breathing cycle progresses. The present invention also provides adaptive adjustment of cycling criteria to optimize the cycling operation.

The invention is directed to a system and method for controlling the flow of gas from a medical ventilator into a patient's lungs. The control system provides for a non-linear feedforward controller to correct for disturbances caused by back pressure at the outlet of the blower of the medical ventilator. For this purpose, a pressure transducer is provided to measure the back pressure. Additionally, the invention allows for a feedback controller to correct for the differences between the rate of the actual gas flow and the targeted gas flow rate. For this purpose a flow rate transducer is provided. The control system may account for each of the gas flow rate error and the back pressure disturbance to provide for a quick and accurate adjustment to achieve the targeted gas flow rate.

This disclosure describes systems and methods for purging narrow diameter sensor tubing, occasionally referred to as “sensor lines”, in a ventilation system. The disclosure describes a novel approach in which a series of short, periodic releases of pressurized gas through the sensor tubes are used to clear any blockages due to condensation or patient secretions.

Systems and methods are described for application of a transitory corrective modification to a hot-wire anemometer flow voltage and / or calculated flow rate to compensate for transient thermal response of the anemometer during a change in mixture of a mixed gas being measured. According to one embodiment a method of applying the transitory corrective modification is provided. An output signal of an exhalation flow sensor of a medical ventilator is received. The flow sensor includes a hot-wire anemometer. The output signal is indicative of a rate of flow of expired gas by a patient. Transient thermal response of the hot-wire anemometer is compensated for by applying a corrective modification to the output signal or a value based thereon. The corrective modification is based at least in part on a fraction of inspired oxygen (FiO2) being supplied by the medical ventilator to the patient.

A medical ventilator system and method that triggers, cycles, or both based on patient effort, which is determined from cross-correlating patient flow and patient pressure. The medical ventilator is also controlled such that sensitivity to a patient initiated trigger increases as the expiratory phase of the breathing cycle progresses. The present invention also provides adaptive adjustment of cycling criteria to optimize the cycling operation.

A medical ventilator system is disclosed which automatically controls and modifies the oxygen support provided to the patient. The system includes a source of pressurized oxygen and a fluid conduit extending between the pressurized oxygen source and a patient. A valve is fluidly connected in series with the conduit which is variably controllable to vary the oxygen support for the patient. A pulse oximeter provides an SpO2 signal representative of the blood saturation of the patient. A controller is responsive to the magnitude of the SpO2 signal as well as the rate of change of the SpO2 signal for varying the oxygen support (FiO2) to the patient by variably actuating the valve. Preferably, the controller utilizes fuzzy logic to determine the proper oxygen support for the patient.

A medical ventilator system that allows the use of pulse flow of oxygen to gain higher FIO2 values and / or conserve oxygen is described. In one embodiment, the ventilator system includes an oxygen concentrator, a medical ventilator and a breathing circuit between the ventilator and a patient. In one embodiment, the oxygen concentrator includes a controller module that is configured to generate a trigger signal to initiate the distribution of one or more pulses of oxygen from the oxygen concentrator to the patient circuit at the onset of a ventilator supplied breath. A small flow of oxygen can be added in between pulses to aid in gaining higher FIO2.

A ventilatory system for providing ventilatory support to a patient without the need for an external source of pressurized drive gas. The ventilatory system comprises a drive pump and a controller such that the drive pump collects ambient air and may pressurize it to a pressure determined by the controller. The controller may signal to the drive pump to pressurize the collected ambient air to a first pressure for delivering ventilatory support to a patient and a second pressure for providing PEEP support to a patient. The controller may signal to the drive pump to deliver a targeted flow and / or volume of collected ambient air to the bellows to provide volumetric ventilatory support during inhalation and a PEEP support during exhalation.

A method for determining functional residual capacity (FRC) of a patient while ventilating the patient. The system may include a medical ventilator which provides inhalation and exhalation from the patient, a sensor which measures a fraction one or more gas components of the inhalation and a fraction of the same gas components of the exhalation. A step change of oxygen fraction is provided to the inhalation of the patient. Subsequent to the step change, The fractions of the gas components are measured in the inhalation and in the exhalation. The functional residual capacity of the lungs of the patient is measured based on the fraction of the gas components in the inhalation and in the exhalation. The step change is provided manually by a technician, or automatically by programming a programmable device to provide the step change automatically to the patient by the medical ventilator. The step change is either an increase or a decrease in of the oxygen fraction.

A method for providing a pressure reference level for pressure triggering a ventilator responsive to a spontaneous breathing attempt by a patient. In the method, the patient connection of the breathing circuit is capped or plugged. A gas flow is then provided through the breathing circuit and is altered to an amount that causes the flow resistance properties of the breathing circuit to generate a desired gas pressure in the breathing circuit suitable for use as a reference pressure by the ventilator for pressure responsive triggering. During the operation of the ventilator, gas flow in a corresponding amount serves as a bias flow in the breathing circuit to assist breathing by the patient. The bias flow also generates the reference pressure level in the breathing circuit. A reduction in pressure from the pressure level resulting from inhalation by the patient triggers the operation of the ventilator.

A monitoring system for multiple medical ventilators is provided. In one aspect, the monitoring system includes a memory that includes instructions, and a processor. The processor is configured to execute the instructions to receive data for a plurality of medical ventilators, and identify a configuration for each of the plurality of medical ventilators from the received data for the plurality of medical ventilators. The processor is also configured to execute the instructions to associate each patient with a respective one of the plurality of medical ventilators, determine an identification and status for each patient associated with one of the plurality of medical ventilators, and provide, for display, information indicative of the configuration of each of the plurality of medical ventilators and indicative of the identification and status of each patient associated with one of the plurality of medical ventilators. Methods and machine-readable media are also provided.

A medical ventilator includes a pressure generator for increasing a pressure of gas that produces heat during the operation thereof. A heat sink spaced from the pressure generator is provided for absorbing heat from the pressure generator. A bacteria filter requiring heating in excess of an ambient temperature for the effective operation thereof is coupled in thermal communication with the heat sink. A heat pipe is coupled in thermal communication with the heat sink and the pressure generator for conveying at least part of heat produced by the pressure generator to the bacteria filter via the heat sink.

A method for providing a pressure reference level for pressure triggering a ventilator responsive to a spontaneous breathing attempt by a patient. In the method, the patient connection of the breathing circuit is capped or plugged. A gas flow is then provided through the breathing circuit and is altered to an amount that causes the flow resistance properties of the breathing circuit to generate a desired gas pressure in the breathing circuit suitable for use as a reference pressure by the ventilator for pressure responsive triggering. During the operation of the ventilator, gas flow in a corresponding amount serves as a bias flow in the breathing circuit to assist breathing by the patient. The bias flow also generates the reference pressure level in the breathing circuit. A reduction in pressure from the pressure level resulting from inhalation by the patient triggers the operation of the ventilator.

The invention is directed to a system and method for controlling the flow of gas from a medical ventilator into a patient's lungs. The control system provides for a non-linear feedforward controller to correct for disturbances caused by back pressure at the outlet of the blower of the medical ventilator. For this purpose, a pressure transducer is provided to measure the back pressure. Additionally, the invention allows for a feedback controller to correct for the differences between the rate of the actual gas flow and the targeted gas flow rate. For this purpose a flow rate transducer is provided. The control system may account for each of the gas flow rate error and the back pressure disturbance to provide for a quick and accurate adjustment to achieve the targeted gas flow rate.

This disclosure describes systems and methods for conducting and terminating spontaneous breathing trials on patients receiving mechanical ventilation. The disclosure describes a novel spontaneous breathing trial manager for a medical ventilator with rapid initiation and continuous monitoring of a patient's tolerance of the spontaneous breathing trial and displaying of that tolerance as a function of time, which provides for bedside adjustment of the spontaneous breathing trial parameters and automatic termination of a spontaneous breathing trial based on a time interval expiration or poor patient tolerance of the SBT.

Systems and methods are described for application of a transitory corrective modification to a hot-wire anemometer flow voltage and / or calculated flow rate to compensate for transient thermal response of the anemometer during a change in mixture of a mixed gas being measured. According to one embodiment a method of applying the transitory corrective modification is provided. An output signal of an exhalation flow sensor of a medical ventilator is received. The flow sensor includes a hot-wire anemometer. The output signal is indicative of a rate of flow of expired gas by a patient. Transient thermal response of the hot-wire anemometer is compensated for by applying a corrective modification to the output signal or a value based thereon. The corrective modification is based at least in part on a fraction of inspired oxygen (FiO2) being supplied by the medical ventilator to the patient.

A medical ventilator system is disclosed which automatically controls and modifies the oxygen support provided to the patient. The system includes a source of pressurized oxygen and a fluid conduit extending between the pressurized oxygen source and a patient. A valve is fluidly connected in series with the conduit which is variably controllable to vary the oxygen support for the patient. A pulse oximeter provides an SpO2 signal representative of the blood saturation of the patient. A controller is responsive to the magnitude of the SpO2 signal as well as the rate of change of the SpO2 signal for varying the oxygen support (FiO2) to the patient by variably actuating the valve. Preferably, the controller utilizes fuzzy logic to determine the proper oxygen support for the patient.

A medical ventilator capable of early detecting and recognizing types of pneumonia, a gas recognition chip, and a method for recognizing gas thereof are disclosed. The gas recognition chip of the medical ventilator comprises a sensor array, a sensor interface circuit, a stochastic neural network chip, a memory and a microcontroller. The sensor array receives a plurality of multiple types of gases to produce odor signals corresponding to each type of gas. The sensor interface circuit analyzes the odor signals to produce gas pattern signals corresponding to each type of gas. The stochastic neural network chip amplifies the differences between the gas pattern signals and performs dimensional reduction on the gas pattern signals to aid the analysis. The memory stores training data. The microcontroller performs a mixed gas recognizing algorithm to early detect and recognize the type of the pneumonia according to the gas training data.

A flow sensor for a medical ventilator system is disclosed herein. The flow sensor includes a valve assembly having a valve seat, and a valve flap attached to the valve seat. The valve flap is composed of an elastomeric material configured to generate a pre-load that biases the valve flap into engagement with the valve seat such that the valve assembly remains closed in the absence of an externally applied force. The flow sensor also includes a pressure transducer configure to measure a first pressure level at an upstream position relative to the valve assembly, and a second pressure level at a downstream position relative the valve assembly. The flow sensor also includes a processor configured to estimate the flow rate of a fluid passing through a medical ventilator system based on the first and second pressure levels.

A portable critical care medical ventilator with autonomous control of oxygenation is provided. The system and method provide for significantly reducing the O2 required to maintain an adequate O2 concentration and as a result delivery of O2 to the body's tissues and does not require the clinician to enter initial values.

The invention discloses a three-way pressure balance valve and a medical respirator. The three-way pressure balance valve comprises a three-way integrated pipe, wherein, the three-way integrated pipe comprises an air source port, a release port and a breathing port; the air source port is communicated directly with the breathing port; a thoracic diaphragm is arranged on the inner end of the air source port; the air source port is communicated with the release port through the space above the thoracic diaphragm; and the thoracic diaphragm is connected with an actuator which is used for actuating up-and-down movement of the thoracic diaphragm so as to adjust the gap size between the air source port and the release port. The medical respirator is connected with the three-way pressure balancevalve to adjust the gap size between the air source port and the release port by up-and-down movement of the thoracic diaphragm and control an inspiration pressure and an expiration pressure respectively to maintain proper pressure at inspiration and expiration stages. The three-way pressure balance valve can realize two horizontal pressures to reach the optimal pressure. The medical respirator has the advantages of simple structure, convenient use and accurate control.

The invention discloses an electromagnetically controlled tee-joint flow valve and a medical breathing machine. The electromagnetically controlled tee-joint flow valve comprises an air source opening, a releasing opening and a breathing opening, wherein an inspiration valve is arranged between the air source opening and the breathing opening, an expiration valve is arranged between the breathing opening and the releasing opening, the inspiration valve and the expiration valve are regulated in a linkage relationship, are of a hollowed cylindrical nested structure and respectively comprise a fixing cylinder and a sliding cylinder which are nested together, and the sliding cylinders of the inspiration valve and the expiration valve are connected with electromagnetic drivers so as to realize synchronous control on opening degrees of the inspiration valve and the expiration valve. The medical breathing machine can control pressure and flow of inspiration and expiration by regulating the opening degrees of the inspiration valve and the expiration valve after being connected with the electromagnetically controlled tee-joint flow valve so as to maintain the suitable pressure or flow during inspiration and expiration, thus double-level pressure control and flow control of the medical breathing machine is realized; in addition, the medical breathing machine has the advantages of simple structure, convenience for using, exactness in control and capability of reducing power consumption.

The invention discloses a medical respirator achieving aerosolization. The respirator comprises a respirator main body, an inner cavity of the respirator main body is internally provided with an oxygen supply device and an aerosolization box, the oxygen supply device comprises an air-oxygen mixer, and the air-oxygen mixer is communicated with an air pipeline, a pure oxygen pipeline and a mixed gaspipeline in sequence; an inner cavity of the aerosolization box is internally provided with a liquid medicine box, medicine delivery pipes are symmetrically communicated with the liquid medicine box,a compressed air blower is arranged on the liquid medicine box, a straight duct is communicated with an air outlet, the straight duct is communicated with a trapezoidal duct which is communicated with a thin duct, the symmetrical medicine delivery pipes and the thin duct are gathered and communicated, and an atomization mesh is arranged in the thin duct. According to the medical respirator achieving aerosolization, humidified gas moderate in air-oxygen ratio can be provided, for a patient needing aerosolization, the device can meet the requirements of oxygen inhalation and aerosolization of the patient simultaneously, equipment replacement is not needed, and convenience is brought to use.

A monitoring system for multiple medical ventilators is provided. In one aspect, the monitoring system includes a memory that includes instructions, and a processor. The processor is configured to execute the instructions to receive data for a plurality of medical ventilators, and identify a configuration for each of the plurality of medical ventilators from the received data for the plurality of medical ventilators. The processor is also configured to execute the instructions to associate each patient with a respective one of the plurality of medical ventilators, determine an identification and status for each patient associated with one of the plurality of medical ventilators, and provide, for display, information indicative of the configuration of each of the plurality of medical ventilators and indicative of the identification and status of each patient associated with one of the plurality of medical ventilators. Methods and machine-readable media are also provided.

The invention discloses a medical ventilator and a method of continuously measuring airway resistance and compliance for the medical ventilator. The medical ventilator comprises a pressure control device, the pressure control device is provided with an air source input port, an air flow control port and an air flow output port, and the air flow output port is connected with an air flow sensor and a pressure sensor that measures airway pressure of a patient; the medical ventilator employs an airway positive pressure ventilation mode, a high-frequency oscillatory pressure with adjustable amplitude, frequency and duration is added to the pressure level of the airway positive pressure ventilation mode, airway resistance and lung compliance of the respiratory system are measured through the high-frequency oscillatory pressure and flow, the airway resistance and the lung compliance are continuously monitored, and the medical ventilator and the method are used to measure respiratory resistance and compliance at the premise of not interfering normal respiratory cycle of a patient and provide continuous monitoring for the respiratory resistance and compliance. The medical ventilator and the method will help a doctor to set parameters of a mechanical ventilator such that ventilation state of a patient is adjusted in time and ventilation therapeutic efficiency of the ventilator is improved.

A medical ventilator capable of early detecting and recognizing types of pneumonia, a gas recognition chip, and a method for recognizing gas thereof are disclosed. The gas recognition chip of the medical ventilator comprises a sensor array, a sensor interface circuit, a stochastic neural network chip, a memory and a microcontroller. The sensor array receives a plurality of multiple types of gases to produce odor signals corresponding to each type of gas. The sensor interface circuit analyzes the odor signals to produce gas pattern signals corresponding to each type of gas. The stochastic neural network chip amplifies the differences between the gas pattern signals and performs dimensional reduction on the gas pattern signals to aid the analysis. The memory stores training data. The microcontroller performs a mixed gas recognizing algorithm to early detect and recognize the type of the pneumonia according to the gas training data.

The invention discloses a medical breathing machine in an air duct positive-pressure high-frequency ventilating mode. The medical breathing machine adopts an air duct positive-pressure ventilating mode, a high-frequency pulse pressure wave with adjustable amplitude, frequency and duration is increased in the pressure level of an air duct positive-pressure ventilating mode, and the ventilating modes can be divided into at least seven types, namely single-level positive-pressure high-frequency ventilation, double-level inspiration phase high-frequency ventilation, double-level expiration phase high-frequency ventilation, double-level expiration and inspiration two-phase high-frequency ventilation, proportional ventilation inspiration phase high-frequency ventilation, proportional ventilation expiration phase high-frequency ventilation, and proportional ventilation inspiration phase and expiration phase high-frequency ventilation. By superposing vibration amplitude, vibration frequency and vibration time duration on different treatment pressures in different breathing sections to generate the high-frequency ventilating pressure of the air duct, the smoothness of the air duct and the increase of the pulmonary ventilation in ventilation treatment are achieved, and the blood oxygen concentration and the carbon dioxide concentration are adjusted.

A medical ventilator with a pneumonia and pneumonia bacterial disease analysis function by using gas recognition includes a sensor array, a sensor circuit, a stochastic neural network chip, a memory and a microcontroller. The sensor array detects a plurality of gases under test and generates a plurality of recognition signals corresponding to the gases under test. The sensor circuit reads and analyzes the recognition signals to generate a plurality of gas pattern signals corresponding to the gases under test. The stochastic neural network chip reduces a dimension of the gas pattern signals to generate an analysis result. The memory stores gas training data. The microcontroller receives the analysis result, and identifies types of the gases under test according to the analysis result.