199 results about "Expiratory valve" patented technology

A method and an apparatus for monitoring and controlling flows in medical equipment including an anesthetic machine and a ventilator for influencing a patient's respiratory system are disclosed. The apparatus comprises a microprocessor and an airway system comprising drive gas conduits provided with an inhalation valve (2) and an exhalation valve (5) for gas discharging as well as a ventilator end flow sensor (3) for measuring the introduced or discharged drive gas flow through the valves. The airway system also comprises patient end breathing tubing in which a patient end flow sensor (11) for measuring the patient's inspired and expired gas flow is provided. By comparing the measured values of the two flow sensors against the characteristic curve of the inhalation valve (2), the microprocessor can judge the operation states and accuracy of the respective flow sensors and the inhalation valve (2).

The inhalation therapy assembly and method of use described herein increases the efficiency of metered dose inhalers by allowing delivery of the doses to a collapsible reservoir which can be manually pumped, ensuring that medicants contained therein are properly and completely delivered to the patient. Terminal and proximal valves of the one-way diaphragm type allow flow of the aerosol medicants while preventing improper expulsion. An exhalation valve is adjustable to ensure the patient exhales suitably to permit proper medicant absorption. A conventional metered dosage inhaler having an approved FDA canister provides proper dosage to the patient and is joined to the collapsible reservoir by a connector having a plurality of apertures for receiving the MDI and an accessory T-fitting.

A device for treating a patient suffering from obstructive sleep apnea or snoring can include an expiratory valve connected to a manifold. The expiratory valve can include a body portion including a feedback port configured to be connected to an air flow generator. The expiratory valve can include a plunger at least partially disposed in the body portion. The expiratory valve can include a pressurizing chamber positioned between an end of the plunger and an end of the expiratory valve. The pressurizing chamber can be configured to receive air from the air flow generator through the feedback port.

A positive pressure airway device for providing resistance in an air pathway for a patient exhaling. The device includes an inhalation passageway for letting air into the device when a patient breathing through the device inhales, and an exhalation passageway for passing air out of the device when a patient breathing through the device exhales. The device preferably includes an inhalation valve to allow air to flow into, but not out of, the inhalation passageway, and an exhalation valve to allow air to flow out of the exhalation passageway only when a patient using the device exhales with an expiratory air pressure greater than a pre-determined pressure. A variable pressure spring may control the force needed to open the exhalation valve.

Breathing apparatus including an exhalation tube and an outlet port in fluid communication with the exhalation tube, where the outlet port includes an outlet lip that is not uniformly flat in any cutting plane.

A flexible oro-nasal mask for mounting in a rigid shell attached to the helmet of aircrew at a fixed distance therefrom. The flexible oro-nasal mask incorporates an inspiratory and expiratory valve and the periphery of the mask is adapted to make a seal with the pilot's face. The oro-nasal mask includes an extendable structure which presses the periphery of the mask automatically towards the pilot's face to improve the seal therewith when gas at a pressure above that required for normal breathing is supplied to the mask. The extendable structure is configured so that when gas at a high pressure is supplied to the interior of the mask, the portion in the bottom region of the mask extends more than the portion in the upper region of the mask and the bottom of the mask is moved away from the wearer's face by a greater amount in the chin region than the nose region and the mask pivots upwardly automatically to compensate for the effects of G thereon. One embodiment of an extendable structure comprises an annular inwardly directed re-entrant recess formed in the wall of the mask adjacent the peripheral seal, the depth of said recess in the bottom half of the mask being greater than the depth in the top half thereof.

The invention discloses an expiratory valve. The valve comprises a valve body, a top cover, a linear air-resistor, a membrane baffle, a membrane and a valve cover, wherein a first connection part is arranged on the valve body; a second connection part is arranged on the top cover, and the first connection part of the valve body and the second connection part are connected; a plurality of net nest-shaped pores are arranged on the linear air-resistor, and one end of the linear air-resistor is limited by the top cover; the membrane baffle is used for supporting the control external force of a respirator; a groove part for receiving the membrane baffle is arranged on the membrane; and the valve cover is combined with the membrane, and is received in the valve body. Because the expiratory valve is connected and installed in a mode of screw threads, the expiratory valve has low cost, and is convenient for disassembly, cleaning, disinfection and maintenance, so that the expiratory valve can be neatly installed or replaced infinitely, and is suitable for batch production.

The invention discloses a control method and control system for implementing double horizontal pressures in an air passage. The control method comprises the following steps of: enabling the air inlet end of the air passage to be in a cut-off state or conducting state; enabling the air outlet end of the air passage to be in a cut-off state or conducting state with the external atmosphere by means of an expiratory valve; communicating a control air channel at the control end of the expiratory valve with an air supply source, and keeping the control air channel in a throttling state or full-conducting state, wherein the low-level pressure of the air passage can be set by regulating the throttling quantity of the control air channel in the throttling state; and controlling the state of the air inlet end of the air passage and the state of the control air channel of the expiratory valve in accordance with breath settings and the detected pressure of the air passage. The invention also discloses an anaesthetic machine and breathing machine with the control system. By using the method and system, the invention can completely achieve the functions which can be realized by adopting a proportional valve, an electronic PEEP (Positive End Expiratory Pressure) valve and closed-loop control, and has the advantages of simple design and low cost.

The present invention discloses an expiratory valve, including a step motor, a valve core, a membrane, a first mandril, a base plate and a first elastic part. The valve core is provided with an air inlet, an air outlet and a valve opening. The first mandril is supported on the base plate by elasticity of the first elastic part. The step motor drives a straight-line motion of the base plate by an actuating mechanism. The membrane is elastic, the edge of which is fixed at the valve core, and the parts of the membrane is placed at a motion curve of the first mandril. The valve opening is placed at the motion curve of the membrane, which makes the membrane adjust an opening angle of the valve opening according to an exhalation status. Because the step motor is adopted as driving force, the responding speed is fast; because an elastic force of the elastic part is used as retention of the membrane which seals the valve opening, the opening angle of the valve opening can be dynamically adjusted; because the expiratory valve can adopt the common actuating mechanism, the cost is low, and the expiratory is easy to be realized.

The invention discloses a bowl-shaped three-dimensional folding dustproof mask. The inner layer of the mask is a non-woven fabrics skeleton, and the outer layer is shell fabric, and filter cloth and grid cloth are arranged between the inner layer and the outer layer; the middle section of the grid cloth is a horizontal weld line, and a vertical weld line which is connected with the horizontal weld line extends downwards to the opening edge; the grid cloth can be folded along the horizontal weld line and the vertical weld line; the mask is stuck with silicon rubber on one surface which contacts with the bridge of the nose and the lower forehead of a human face; and an one-way expiratory valve is arranged on one side below the horizontal weld line. The invention has the advantages that the bowl-shaped three-dimensional folding dustproof mask can be folded, can keep original shape after being restored, and has small space usage and provides convenience for packaging and transporting, and a user can conveniently put the mask in the pocket.

The invention is applicable to the field of medical appliances and provides a ventilating system of an anesthesia apparatus and a pressure calibration method thereof. In the embodiment of the invention, pressure acquisition points of a valve seal pressure sensor are arranged in a cavity between an air box and a folding bag, so that the acquired pressure is more accurate; and an air control expiratory valve is changed into an electric control expiratory valve based on a voice coil motor. The invention also provides a pressure calibration method based on an improved air passage, which uses an air passage pressure gauge and a graphical calibration interface of the anesthesia apparatus respiratory system to calibrate all the pressure sensors in the apparatus, thereby realizing fast calibration without disassembling the apparatus and fast calibration of pressure-free calibration equipment, saving the calibration time and lowering the maintenance cost of the apparatus.

The invention provides a device and a method for controlling an exhalation valve, the device for controlling the exhalation valve comprises: a film disk (9); an electromagnetic valve which is positioned at first side of the film disk (9); a first exhaust chamber (11) and an air inlet chamber (10), which are positioned at second side of the film disk (9), and the film disk (9) can selectively block off the air inlet chamber (10) and a channel between the first exhaust chamber (11) and the air inlet chamber (10) by a valve rod (2) of the electromagnetic valve. The method for controlling the exhalation valve comprises that: the electromagnetic valve is controlled to lead the film disk (9) to move towards the direction of an electromagnet under the input pressure function of the air inlet chamber (10); the input air flow of the air inlet chamber (10) is exhausted from the first exhaust chamber (11) from an air flow channel; the air flow is controlled to be directly flowed into an air containing chamber of the exhalation valve, thus pushing an exhalation valve body of the exhalation valve to block off an exhalation chamber of the exhalation valve. The device has fast response time and high control precision.

An artificial ventilation apparatus includes: a connecting portion which is connected to a respiratory system of a patient; an inspiratory circuit which is a flow path for flowing a gas from a ventilator to the connecting portion; an expiratory circuit which is a flow path for guiding a gas exhausted from the connecting portion to an exhaust portion of the ventilator; an expiratory valve which blocks a flow of a gas from the exhaust portion toward the connecting portion; a carbon dioxide concentration sensor which is disposed in a circuit that is arranged at a downstream side of the expiratory valve and which detects a carbon dioxide concentration; and an alarm outputting unit which outputs an alarm based on an output of the carbon dioxide concentration sensor.

Resuscitation assembly (101) comprising a patient mask (107), a ventilation bag (105), an inflation valve (113), an exhalation valve (111), and an expiration indicator (119). The expiration indicator (119) is a positive end expiratory pressure valve in the form of a slit valve that exhibits a slit (131) in a flexible sheet part (125). Also disclosed is a resuscitation assembly (101) comprising a patient mask (107), a ventilation bag (105), an inflation valve (113), an exhalation valve (111), a positive end expiratory pressure valve (119), and a pressure sensor (133) adapted to measure pressure on the patient side (127) of the positive end expiratory pressure valve (119).

The invention discloses an expiratory vale for a respirator, comprising a valve body which is provided with a valve cavity, an air admission valve port and an air outlet valve port; the air outlet valve port is provided with a valve cover which is internally provided with a membrane; and the valve cavity is internally provided with an air flow sensor. The valve cavity is internally provided with a fluid director which is positioned in the valve cavity between the air admission valve port and the air flow sensor. The valve body is provided with a sensor installation hole which is communicated with the valve cavity. In the proposal, as the valve cavity is internally provided with the air flow sensor, the expiratory valve not only has the uni-directional ventilation function, but also has the expiratory volume measuring function, thus simplifying the structure of the respirator, and lowering the manufacturing cost of the respirator. In addition, the arrangement of the fluid director improves the accuracy of the measurement of the expiratory volume; the arrangement of the installation hole realizes the detachable connection mode of the air flow sensor, and when the valve cavity is cleaned and disinfected, the air flow sensor can be moved out through the installation hole first, thus causing the use and maintenance of the respirator to be convenient.

The invention relates to a dustproof gas mask, comprising a mask main body, an expiratory valve cap, a seal washer and a filter, wherein the expiratory valve cap is arranged at the front part of the mask main body. The dustproof gas mask is characterized in that the seal washer is formed by bonding open-type rubber parts, and the seal washer is arranged at the rear part of the mask main body and is provided with an air inlet hole which is provided with an inflating valve. The part of the inner side of the seal washer touching with the lower jaw of the face of a human body is provided with an anti-skidding piece, and the wall of the part of the seal washer touching with the face of the human body is thinner than other parts. The expiratory valve cap is provided with a louvered-fin air outlet hole, and the direction of the louvered-fin air outlet hole is sloping downward. The dustproof gas mask has the characteristics of comfortable wearing and good tightness.

The invention discloses a method for controlling pressure of an anesthesia machine and a breathing machine in a suction valve and expiration valve cooperative control mode, which is characterized by comprising the following steps of: performing flow rate estimation fuzzy control on suction valve pressure by the traditional flow and pressure cooperative fuzzy control method in a pressure control mode; monitoring a pressure variation condition in a system by using a pressure sensor, transmitting the pressure variation condition in the system to an expiration valve control unit and calculating an expiration valve control deviation; performing proportion integration differentiation (PID) control on set suction pressure through the pressure sensor in the suction process and performing the PID control on positive end expiration pressure in the expiration process by using an expiration valve; and grading expiration valve PID control parameters according to required focus points in the grading range of 1cm H2O to 80cm H2O, fitting the PID control parameters under the pressure at the focus points by a curve fitting method or a broken line approximate method, and synchronously controlling a suction valve and the expiration valve in the control process.

The inventive breath training device comprises a respiratory tube, a low-frequency mechanical air oscillation generator provided with an oscillation chamber embodied therein and provided with an input channel which is embodied in the form of an upwardly extending saddle-shaped body of revolution, contains a spherical ball and is connected to the respiratory tube and to an output channel communicating with ambient air, wherein the respiratory tube is provided with a jacket in which the body of the low-frequency mechanical air oscillation generator rotatable about a horizontal axis is fixed and a bypass chamber provided with an inspiratory tube is formed, said inspiratory tube comprises an inspiratory valve provided with a tubular attachment and the output channel of the oscillation chamber of the low-frequency mechanical air oscillation generator is also provided with an expiratory valve.

An artificial ventilation apparatus includes: a connecting portion which is connected to a respiratory system of a patient; an inspiratory circuit which is a flow path for flowing a gas from a ventilator to the connecting portion; an expiratory circuit which is a flow path for guiding a gas exhausted from the connecting portion to an exhaust portion of the ventilator; an expiratory valve which blocks a flow of a gas from the exhaust portion toward the connecting portion; a carbon dioxide concentration sensor which is disposed in a circuit that is provided at a downstream side of the expiratory valve and which detects a carbon dioxide concentration; and an alarm outputting unit which outputs an alarm based on an output of the carbon dioxide concentration sensor.