263 results about "Positive pressure ventilation" patented technology

A patient mask assembly for positive pressure ventilation includes a brace (12) which clips to the mask and provides attachment locations (17) for headgear straps (14) in alternative positions to those attachment locations (17) which may be provided by the mask. The brace may also provide a mask stabilizing portion (20).

A separable double lumen endotracheal tube is disclosed having a first lumen and a second lumen and which are removably affixed together to allow the first lumen to be separated from the second lumen of the double lumen endotracheal tube and, if desired, to be subsequently affixed together again. Either lumen of the double lumen endotracheal tube can function alone for positive pressure ventilation, but normally the bronchial lumen will be removed from a patient and the tracheal lumen left in place to function alone to provide positive pressure ventilation as required by a patient. The double lumen endotracheal tube will, however, function to allow the bronchial lumen to remain in a patient subsequent to removal of the tracheal lumen as a matter of choice during a medical procedure.

The present disclosure relates, in some embodiments, to devices, systems, and/or methods for collecting, processing, and/or displaying stroke volume and/or cardiac output data. For example, a device for assessing changes in cardiac output and/or stroke volume of a subject receiving airway support may comprise a processor; an airway sensor in communication with the processor, wherein the airway sensor is configured and arranged to sense pressure in the subject's airway, lungs, and/or intrapleural space over time; a blood volume sensor in communication with the processor, wherein the blood volume sensor is configured and arranged to sense pulsatile volume of blood in a tissue of the subject over time; and a display configured and arranged to display a representative of an airway pressure, a pulsatile blood volume, a photoplethysmogram, a photoplethysmogram ratio, the determined cardiac output and/or stroke volume, or combinations thereof. A method of assessing changes in cardiac output or stroke volume of a subject receiving airway support from a breathing assistance system may comprise sensing pressure in the subject's airway as a function of time, sensing pulsatile volume of blood in a tissue of the subject as a function of time, producing a photoplethysmogram from the sensed pulsatile volume, determining the ratio of the amplitude of the photoplethysmogram during inhalation to the amplitude of the photoplethysmogram during exhalation, and determining the change in cardiac output or stroke volume of the subject using the determined ratio.

A method for cultivating algae can include providing a body of water in a substantially enclosed system. The enclosed system can have a length of channel and a cover. The method can optionally include circulating the body of water through the enclosed system under positive pressure conditions. The positive pressure should prevent ingress of any external atmosphere or material. Further, the method can include cultivating the algae in the body of water at conditions which promote growth. Likewise, a system for cultivating algae can include a channel with a cover, water in the channel, and a pump to introduce positive pressure into the system.

A headgear device is described which includes a plurality of flexible straps for easy adjustment and adaptation to support various devices worn on the head. In one embodiment the headgear can be adapted to be connected to a positive pressure ventilation system.

Method and apparatus for the treatment of cardiac failure, Cheyne Stokes breathing or central sleep apnea are disclosed. A subject is provided with ventilatory support, for example positive pressure ventilatory support using a blower and mask. Respiratory airflow is determined. From the respiratory airflow are derived a measure of instantaneous ventilation (for example half the absolute value of the respiratory airflow) and a measure of longterm average ventilation (for example the instantaneous ventilation low pass filtered with a 100 second time constant). A target ventilation is taken as 95% of the longterm average ventilation. The instantaneous ventilation is fed as the input signal to a clipped integral controller, with the target ventilation as the reference signal. The output of the controller determines the degree of ventilatory support. Clipping is typically to between half and double the degree of support that would do all the respirator work. A third measure of ventilation, for example instantaneous ventilation low pass filtered with a time constant of 5 seconds, is calculated. Ventilatory support is in phase with the subject's respiratory airflow to the fuzzy extent that this ventilation is above target, and at a preset rate conversely.

A flow diverter valve is used in controlling the pressure and/or flow rate of a breathable gas supplied to the airways of a patient by a breathable gas flow generator supply apparatus during, for example, ventilatory assistance treatments such as non-invasive positive pressure ventilation and nasal Continuous Positive Airway Pressure (CPAP) treatment of Obstructive Sleep Apnea. The flow diverter valve includes a vane and a housing. The housing has an inlet port, an outlet port, and an exhaust port. The exhaust port opens to atmosphere, and the inlet port is in fluid communication with the flow generator. The outlet port is in fluid communication with a patient mask via a conduit. The vane is configured with respect to the housing such that a blower associated with the CPAP apparatus remains substantially unchoked, regardless of whether the vane is in the open or closed position.

The present inventions provide positive airway pressure therapy apparatus to humidify the pressurized air delivered to a user during various positive airway pressure therapies and corresponding methods. The positive airway pressure therapy apparatus may be configured to administer one or more positive airway pressure therapies, including: continuous positive airway pressure therapy (CPAP), bi-level positive airway pressure therapy (BPAP), auto positive airway pressure therapy (autoPAP), proportional positive airway pressure therapy (PPAP), and/or other positive airway pressure therapies.

In a CPAP or positive pressure ventilation system, leak is determined at each instant by a lookback for a time as long as single breath to establish the start of an averaging window over which low-pass filtered values used in the determination of a parameter of a leak model are averaged. A jamming index indicates whether the leak is rapidly changing. To the extent that jamming is high, the leak estimate used progressively changes from that using sliding breath-window averaging to a more robust and faster responding low-pass filter method, and adjustment of ventilatory support based on measures employing estimated respiratory flow is slowed down or stopped.

A self-inflating resuscitation system formed from a self-inflating resuscitation bag and an exhalation indicator. In particular, the self-inflating resuscitation bag provides an exhalation indicator, which may be an audio or visual indicator, or both. The exhalation indicator enables a caregiver to more accurately determine whether a patient is being ventilated, unlike prior art self-inflating resuscitation bags, and helps to detect esophageal intubation in intubated patients or gastric trapping of gas in non-intubated patients undergoing positive pressure ventilation. In general, the device may be interposed between any source of positive pressure ventilation and any airway device to monitor exhalation as an indicator of adequacy of ventilation.

A flow-inflating respiratory face mask is disclosed that includes a thin, pliant skirt that surrounds the base of the face mask. The skirt inflates automatically when the face mask receives external pressurized air. The skirt is compliant, soft, and adapts easily to the topography of the face which produces a good fit and adds to the comfort of the patient.

A system selectively delivers either breath-synchronized, flow-targeted ventilation (BSFTV) or closed-system positive pressure ventilation (CSPPV) to augment respiration of a patient with a standard tracheal tube. A removable adaptor has a cap that can be removably attached to the proximal connector of the tracheal tube in BSFTV mode, and an inner cannula that extends within the tracheal tube to effectively divide it into two lumens. The adaptor includes a ventilator connector for removably engaging a ventilator hose to deliver air/oxygen through the adaptor and one lumen of the tracheal tube with a flow rate varying over each respiratory cycle in a predetermined waveform synchronized with the patient's respiratory cycle to augment the patient's spontaneous respiration. The adaptor also includes a port allowing the spontaneously-breathing patient to freely inhale and exhale in open exchange with the atmosphere through the other lumen.

The invention discloses a negative pressure suction type dust fall road barrier which comprises a unit body. The unit body is provided with a transmission cavity, a driving cavity and a water storagecavity from top to bottom in sequence, and a water injection hole communicated with the water storage cavity is formed in the unit body. The barrier has the advantages that by means of the airflow effect generated by the rapid passage of vehicles, a wind wheel is driven to rotate circumferentially and quickly, and an a rotating plate coaxially arranged with the wind wheel rotates synchronously; byconverting repellence of an active magnet and a driven magnet and the elastic force of a reset spring into left and right linear motion of an air-tight piston, by means of a one-way air extraction channel, the dust fall channel is in a negative pressure state, by means of a one-way inflatable channel, a booster cavity is in a position pressure state, the dust fall channel under the negative pressure state forms pumping action on external dusty gas, the booster cavity under the positive pressure state performs atomization on water through a three-prong spray channel, the contact area between the dust and the water is expanded, the dust fall effect is improved, air pollution is reduced, and the pedestrian health is protected.

The present invention relates to delivery conduits used in systems that provide positive pressure ventilation therapy. In particular, the present invention relates to a sleeve that allows flexible conduits to be joined and sealed to a thermoplastic connector, allowing for gases to be supplied to the conduit. The sleeve is used in the over moulding of an end connector onto the conduit. The sleeve and method of attaching a connector to a conduit of the present invention has the advantage that it prevents the connector from loosening or breaking when the conduit is bent, pulled or stressed, which can occur in some cases where the connector is attached to the conduit using a bond, such as glue. Furthermore, the occurrences of flashing of plastic across the conduit walls will be prevented during moulding, ensuring that no air or water leakages occur within the conduit walls.

A sealing device for positive pressure testing is attached to a respirator face mask and includes an outer frame integrally joined to a movable cap by a flexible link that biases the cap in an open position for the operational use of the face mask against a manually applied force to move the cap to a sealed position for the positive pressure testing to assure the proper fit of the face mask on the wearer. The method for positive pressure testing includes flexibly moving the sealing device from the open position to the sealing position such that the sealing surface of the cap seals the exhalation valve assembly closed. The wearer then exhales into the mask to test the seal of the mask. When the test is completed, the sealing device is released and the inherent biasing force moves the cap from the sealing position to the open position.

A mask or shield comprising a flow of positive pressure air directed through substantially opposing jets that creates a stream of laminar flow filtered air to create a turbulent air pocket therein for supplying filtered breathing air to a wearer's face and to exclude outside unpurified air. Also a mask or shield comprising a flow of positive pressure air directed via a powered impeller unit that is configured to distribute positively pressurised filtered breathable air inside the face mask in a substantially 360° plane or arc substantially parallel to the internal surface of the face mask and to exclude external unpurified air. The mask is separated from and does not form a seal around a wearer's face unless required such as in a deadly environment or malfunction.

The present invention relates to a method of delivering combined positive and negative pressure assist ventilation to a patient, wherein a positive pressure is applied to the patient's airways to inflate the patient's lungs, a negative pressure is applied around the patient's ribcage and/or abdomen in order to reduce a load imposed by the ribcage and/or abdomen on the patient's lungs, and application of the positive and negative pressures is synchronized. The present invention also relates to a system for delivering combined positive and negative pressure assist ventilation to a patient, comprising a positive pressure ventilator connected to the patient's airways for applying a positive pressure to the patient's airways to inflate the patient's lungs, a negative pressure ventilator installed on the patient's ribcage and/or abdomen for applying a negative pressure around the patient's ribcage and/or abdomen in order to reduce a load imposed by the ribcage and/or abdomen on the patient's lungs, and a contmller for synchronising operation of the positive and negative pressure ventilators.