72 results about "Mechanical ventilators" patented technology

Method and apparatus for controlling a ventilator are described. The invention can be used to control mechanical ventilators as well as respiratory assist devices such as CPAP machines. The apparatus receives input data indicative of patient's oxygen level. A controller determines PEEP, or CPAP, and F_IO2, on the basis of data indicative of the patient's oxygen level. In an alternative embodiment, the apparatus further receives input data indicative of patient's carbon dioxide levels, respiratory elastance and airway resistance, and barometric pressure. The controller further utilizes the said input data to determine the optimal values of tidal volume and breathing frequency for a next breath of the patient, and uses the respiratory elastance and airway resistance data to determine any necessary adjustments in the I:E ratio. The controller also applies safety rules, detects and corrects artifacts, and generates warning signals when needed.

A ventilator device and system comprising a rotating compressor, preferably a drag compressor, which, at the beginning of each inspiratory ventilation phase, is accelerated to a sufficient speed to deliver the desired inspiratory gas flow, and is subsequently stopped or decelerated to a basal flow level to permit the expiratory ventilation phase to occur. The ventilator device is small and light weight enough to be utilized in portable applications. The ventilator device is power efficient enough to operate for extended periods of time on internal or external batteries. Also provided is an oxygen blending apparatus which utilizes solenoid valves having specific orifice sizes for blending desired amounts of oxygen into the inspiratory gas flow. Also provided is an exhalation valve having an exhalation flow transducer which incorporates a radio frequency data base to provide an attendant controller with specific calibration information for the exhalation flow transducer.

A portable mechanical ventilator having a Roots blower is configured to provide a desired gas flow and pressure to a patient circuit. The mechanical ventilator includes a flow meter operative to measure gas flow produced by the Roots blower and an exhalation control module configured to operate an exhalation valve connected to the patient circuit. A bias valve connected between the Roots blower and the patient circuit is specifically configured to generate a bias pressure relative to the patient circuit pressure at the exhalation control module. The bias valve is further configured to attenuate pulsating gas flow produced by the Roots blower such that gas flowing to the mass flow meter exhibits a substantially constant pressure characteristic. The bias pressure facilitates closing of the exhalation valve at the start of inspiration, regulates positive end expiratory pressure during exhalation, and purges sense lines via a pressure transducer module.

A method and apparatus for controlling a brushless DC (BLDC) motor over a wide range of angular speeds is presented. Analog magnetic sensors provide continuous signal measurements related to the rotor angular position at a sample rate independent of rotor angular speed. In one embodiment, analog signal measurements are subsequently processed using an arctangent function to obtain the rotor angular position. The arctangent may be computed using arithmetic computation, a small angle approximation, a polynomial evaluation approach, a table lookup approach, or a combination of various methods. In one embodiment, the BLDC rotor is used to drive a Roots blower used as a compressor in a portable mechanical ventilator system.

The present invention relates to a solution for controlling the pressure/flow of breathing gas to a mechanical ventilator (4) by using an energy of breathing analysis and further to provide a pressure relief during exhalation and a trigger determination when to start the pressure relief using energy content of breathing in analysis for determining a pressure curve form during at least a portion of the expiration phase.

A method, system, apparatus, and computer program for detecting breathing pattern changes and controlling a mechanical ventilator in accordance to changes of breathing air flow thus reducing the work of breathing for the patient.

The mechanical ventilator system is a compact and portable artificial respiration system. A negative pressure vortex generator delivers an FiO₂ mix from an air-oxygen blender to the patient during the patient's inhalations, but remains idle during the patient's exhalations. Exhaust gases generated by the patient are released through an exhaust gas valve. During operation, the patient's oxygen saturation level is measured by an infrared pulse-oxygen probe, and an FiO₂ autoregulator is in communication with the probe to receive oxygen saturation level signals. The FiO₂ autoregulator is coupled with the air-oxygen blender to control the oxygen proportion of the FiO₂ mix. An automatic pressure flow sensor is fluidly coupled with the patient's airway to control actuation of the negative pressure vortex generator. The automatic flow sensor is coupled with a controller, which actuates a vortex generator trigger circuit in communication with the vortex generator.

A method and apparatus for facilitating breathing using a mechanical breathing gas ventilator is presented. The patient effort is deduced from a measured flow signal and analyzed with respect to the energy in the breathing system comprising the mechanical ventilator and the patient. When a predetermined energy threshold has been reached the ventilator responds to the breathing pattern change.

The present invention relates to a system and a method for providing mechanical ventilation support to a patient. The system for providing mechanical ventilation support to a patient and includes a mechanical ventilator (26). A breathing circuit (14) is pneumatically connected between the mechanical ventilator (26) and a patient connection (22). An inspiratory check valve (30) is disposed within an inspiratory limb (16) of the breathing circuit (14). A fresh gas manifold (38) provides fresh gas to the breathing circuit (14) for delivery to the patient. A fresh gas valve (52) is disposed between the fresh gas manifold (38) and the breathing circuit (14). The fresh gas valve (52) is operable between a first position which directs fresh gas upstream of the inspiratory check valve (30) and a second position that directs fresh gas downstream of the inspiratory check valve (30). A digital signal processor (44) operates the fresh gas valve (52) selectively between the first position and the second position. A method of ventilating a patient includes introducing a flow of fresh gas into an inspiratory limb (16) of the breathing circuit (14). A ventilatory support value is sensed with at least one sensor (62, 64) disposed within the breathing circuit (14). An operational condition of the breathing circuit (14) is identified with a digital signal processor (44). A fresh gas valve (52) is operated with the digital processor (44) between a first position that directs fresh gas to the inspiratory limb (16) upstream from the inspiratory check valve (30) and a second position that directs the fresh gas downstream from the inspiratory check valve (30).

A miniaturized pre-filled, single-use, disposable, small volume medication nebulizer unit for medicinal use that delivers a mist of properly sized aerosol particles of medicament to the patient with a very high level of efficiency. The nebulizer can be effectively used in conjunction with conventional tee and mouthpiece patient interface devices as well as with more sophisticated interface devices such as dosimetric/reservoir systems, or mechanical ventilator systems.

A multi-lumen breathing tube device providing for separate and bidirectional gas flow for expired and inspired gas during ventilation of a lung. Embodiments of the multi-lumen breathing tube include an improved laryngeal mask airway device and an improved endotracheal tube. The invention is compatible with a circle breathing circuit system used with many mechanical ventilators including those used in conjunction with anesthesia machines.

Bronchoscope adapters and methods of using the same are provided. Aspects of the adaptors include a body having a passageway, a mechanical ventilator access port, a bronchoscope access port configured to receive a bronchoscope into the passageway, and an exit port. The bronchoscope access port comprises a reversibly adjustable inner diameter component that provides locking of the bronchoscope at desired position. The adaptors find use in a variety of different applications.

Algorithms for detecting endotracheal intubation and/or misplacement of endotracheal tubes in child patients during anesthesia for use with anesthesia machines, mechanical ventilators, and/or respiratory function monitors. An algorithm uses end-tidal carbon dioxide (EtCO₂), and tidal volume (TV) or peak inspiratory pressure (PIP) to detect exact intubation time. Another algorithm uses respiratory parameters to identify and/or confirm the type of airway device used during mechanical ventilation, and to detect if and when an issue has arisen with use of a specific airway device to provide real-time decision support to attending medical care professionals.

A noninvasive of detecting patient-ventilator asynchrony that is easily adaptable to existing ventilator monitoring systems and provides timely and actionable information on the degree of patient asynchrony both during invasive and non-invasive ventilation. Capture, analysis or display of, frequency spectra and the use of a measure of spectral organization, such as H1/DC, allows for both manual and automatic adjustment of a ventilators to prevent or correct patient-ventilator asynchrony via interventions. Embodiments use artificial intelligence or machine learning to predict interventions predicted to result in positive outcomes, based on analysis of a large number of epochs, captured by an electronic monitor of a mechanical ventilator, where the monitor continuously monitors, captures and transfers, epochs of data for aggregated machine learning analysis, of such epochs associated with positive outcomes. Scheduling processes that seek to overbook or double book to overcome negative effects of no shows, on clinician productivity in a medical setting.

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 method for determining a blood pressure characteristic, such as SPV and/or PPV of a patient supplied with breathing gases from a mechanical ventilator does not require breathing gas waveforms. An amount of blood pressure data that is at least substantially equal in time to the duration of a breath of the patient is selected. The selection of the amount is not limited to one defined by the commencement or conclusion of a breath of the patient. Preferably blood pressure data in an amount corresponding to the unit of time used to express a respiratory rate is employed and the amount is divided into segments equal in number to the breath number of the respiratory rate. Each of the segments will contain data from a respiratory cycle of the patient although the data for one of the inspiratory/expiratory phases of the respiratory cycle may comprise complementary portions from two successive inspiratory or expiratory phases included in the segment. The blood pressure characteristic is determined from the selected blood pressure data amount.