34 results about "Dead space" patented technology

The invention provides a method for obtaining and evaluating spirographic and gas exchange data, comprising measuring a concentration of a breathing gas gc(Vx) for a plurality of volumes Vx of breathing gas mix, wherein the measuring is performed on inhaled breathing gas mix, further comprising determining an apparatus dead space ApDS, of breathing gas mix in the apparatus not taking part in gas exchange, by evaluating the measured concentrations gc(Vx) as a function of the volume V of the inhaled breathing gas mix. The use of inhaled breathing gas mix allows to determine the apparatus dead space, which is an important parameter when evaluating ventilation efficiency and the like. Furthermore, the invention provides a method in which inhalation and exhalation parts of a spirogram are synchronised, by matching features thereof, in order to further improve the accuracy of gas exchange volumes and derived data. Finally, the invention provides a spirographic device and a patient ventilation apparatus, incorporating the present method.

A system (300) for measuring a metabolic parameter. The system includes an integrated airway adapter (20, 100, 200) capable of monitoring any combination of respiratory flow, O2 concentration, and concentrations of one or more of CO2, N2O, and an anesthetic agent in real time, breath by breath. Respiratory flow may be monitored with differential pressure flow meters under diverse inlet conditions through improved sensor configurations which minimize phase lag and dead space within the airway. Molecular oxygen concentration may be monitored by way of luminescence quenching techniques. Infrared absorption techniques may be used to monitor one or more of CO2, N2O, and anesthetic agents.

In the present invention, personal air filtration unit sold as SMARTMOUTH(TM), a trademark for a personal air filtration unit comprised of an outer activated carbon pre-filter and an inner filter for particulate matter available through Tri-Pact Enterprises has been attached to a column of valve connectors which are connected to a tracheostomy tube. The filter has a downwardly dependent exhaust port which allows expired air to flow out of the filtration unit without passing through the filters, thereby helping to prevent mixing of inhaled and exhaled air, and decreasing resistance to exhalation, as well as one-way valves in the form of a flap, on the one hand to prevent exhaled air from entering a dead space between filters, and on the other hand to prevent entering of inhaled air through the exhaust port.

The invention provides a double-air-chamber one-way airflow filter bag type dustproof respirator composed of a main mask with double air chambers, a sealing gasket, inhalation valves, an exhalation valve, a filter bag, a jacket and a head band. The middle part of the main mask with double air chambers is provided with a partition plate for partitioning an inside space into an upper air chamber and a lower air chamber which are independent; the outer wall of the upper air chamber is provided with the exhalation valve; two sides of the outer wall of the lower air chamber are respectively provided with one of the inhalation valves; a one-way airflow is formed by means of the one-way characteristic of the inhalation valves and the exhalation valve. The sealing gasket is adopted at the part where the main mask with the double air chambers is in contact with the face of a person, and the filter bag is respectively connected with the inhalation valves. The main mask with the double air chambers is provided with the exhalation valve, the inhalation valves, the filter bag and the sealing gasket to form an assembly, and then, the assembly is arranged in the jacket matched with the head band to form the whole respirator. The double-air-chamber one-way airflow filter bag type dustproof respirator is small in respiration resistance, free of dead spaces, incapable of inhaling waste gas and peculiar smell, extremely low in leakage rate, low in use cost, small in size, attractive in appearance and suitable for wearing in daily life.

The invention discloses a multi-channel air particulate matter sampler shunting device. The shunting device comprises an upper end cover and a lower end cover, wherein an airflow inlet is formed in the top end of the upper end cover; the lower end cover comprises a cylinder and a flange located under the cylinder; six conical grooves are uniformly formed in the upper surface of the cylinder around a center axis; side walls of the conical grooves are interested in the center of the cylinder to form a shunting body with a spire structure; airflow outlets are formed in the bottom of the conical grooves; the upper end cover and the lower end cover are buckled to form a shunting cavity. According to the shunting device, air sucked from the same airflow inlet is divided into six parts, the six air paths are symmetrically distributed, taken samples are completely parallel, and multiple parallel samples can be collected simultaneously under the condition of the same air source and the same power. The whole shunting cavity is not provided with a platform, so that dead space volume is avoided, and the problem that the sampling accuracy is influenced due to the fact that the airflow is directly intercepted by the platform is effectively solved.

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.

A non-suffocating protective device for the respiratory tract, which is composed of a nose cover body and an upper lip veneer sealing cavity as the main body, with nostril ventilation holes, condensation water penetration holes, exhalation valves, inhalation valves, elastic Lace, equipped with a ventilation duct, and an air filter device. The design of this product is light, convenient and efficient, which greatly reduces the sealed cavity (the national standard is called dead space). High, low carbon dioxide content, relatively low temperature inside the sealed cavity, making people comfortable without feeling of suffocation.

An ambulatory assist ventilation (AAV) apparatus and system are disclosed for the delivery of a respiratory gas to assist the spontaneous breathing effort of a patient with a breathing disorder. The AAV system includes a compressed respiratory gas source, a respiratory assist device for controlling respiratory gas flow to the patient, a patient circuit tubing and a low profile nasal interface device, which does not have a dead space or hollow area where CO2 can collect, for delivering the respiratory gas to the patient, wherein the nasal interface device is fluidly connected to the respiratory assist device via tubing for receiving the respiratory gas therefrom. In some cases, the nasal interface device may be used in combination with other gas sources, such as oxygen concentrators, to provide dual therapy capability suitable for some applications.

The invention discloses an oxygen production adsorption tower. The tower comprises a tower body, an annular adsorption bin and a gas outlet channel. A gas inlet channel is arranged at the bottom of the tower body, and a filler channel is arranged at the top of the tower body. The annular adsorption bin is arranged in the tower body, the top of the annular adsorption bin is connected with the top of the tower body, and the annular adsorption bin is communicated with the filler channel; and the outer peripheral wall of the annular adsorption bin and the side peripheral wall of the tower body are arranged at intervals so as to form a gas inlet cavity between the outer peripheral wall of the annular adsorption bin and the side peripheral wall of the tower body, the gas inlet cavity is communicated with the gas inlet channel, and a gas outlet cavity is formed in the inner peripheral wall of the annular adsorption bin. According to the oxygen production adsorption tower, dead space can be reduced, gas distribution is uniform, and the operation efficiency of a system is improved.

The invention relates to a medical protective mask. The mask comprises a mask body and adjustable fixing bands penetrating out of the two sides of the mask body. The mask body comprises an upper piece, a body and a lower piece which are sequentially connected and are narrow on the two sides and wide in the middle. A nose wire is arranged at the upper edge in the upper piece. The adjustable fixingbands are arranged on the upper edge of the interior of the upper piece in a tight fit and penetrating manner, penetrate out to the outer side of the upper piece from the positions, which do not exceed the length direction of the nose wire, of the two ends of the upper piece, and penetrate through positioning belt buckles arranged in the middle of the outer side of the upper piece and corresponding to the nose wire in position. The overall filtering structure and mounting structure are more reasonable, the mask body is attached to the face outline, and reasonable stress included angles are formed between the mask body and the adjustable fixing bands in the up-down direction, so that the sealing performance of the mask body is protected, the size of the dead space is small enough, the gas exchange area during breathing is enlarged, and the mask is safe and comfortable to use.

A filter assembly for filtering an exhaust gas and preventing contaminates from reaching a medical sampling instrumentation. The filter assembly comprises a hydrophobic filter media component; a first enclosure with an inlet (second) port communicating with an inwardly facing surface carrying a plurality of first channels, a first annular sidewall surrounding the first channels, and the first annular sidewall carrying a first mating feature at a free end thereof; a second enclosure having an outlet (first) port which communicating with an inwardly facing surface carrying a plurality of second channels, and a second mating feature surrounding the second channels. The first and second enclosures matingly engaging with one another so that the first and the second mating features mate with one another and the first and second enclosures define a filter chamber therebetween which captively retains the hydrophobic filter media component within the filter chamber having minimal dead space.

The invention discloses buccal closed nebulization equipment. The buccal closed nebulization equipment comprises a mask, a fixing strap, a breathing tube, an air filter and a nebulizer nozzle, whereinthe fixing strap is connected with cheeks at two sides of the mask, the breathing tube is used for a patient to breath, the air filter is located at the exhaust end of the breathing tube, and the nebulizer nozzle communicates with the breathing tube in a crossing manner and is used for connecting a medical nebulizer. The buccal closed nebulization equipment can prevent viruses from diffusing intothe air when nebulization treatment is performed on a patient suffering from a respiratory infectious disease to avoid that medical workers and other patients are infected; dead spaces of a nasopharynx are reduced; the situation that the patient suffocates due to the fact that a respiratory tract is clogged is avoided; and breathing exercises of the patient can further be promoted, and thus, recovery of lung functions is facilitated.

The invention relates to a two-way ventilation structure and an oxygen supply device containing the two-way ventilation structure and capable of adjusting the concentration of inhaled oxygen. The two-way ventilation structure comprises a ventilation valve mechanism; and the ventilation valve mechanism is arranged on the pipe wall of a ventilation pipeline and used for keeping two-way air circulation inside and outside the ventilation pipeline and expanding an air flow channel flowing from the ventilation pipeline to the outside when the internal pressure of the ventilation pipeline is larger than the external pressure. The oxygen supply device with the two-way ventilation structure is provided with an inspiration pipeline and an expiration pipeline; an inspiration valve plate and an expiration valve plate are responsible for air circulation of inspiration and expiration respectively; the concentration of inspired oxygen is adjusted by adjusting a convection channel of the two-way ventilation structure on the pipe wall of the expiration pipeline; the principle is simpler and more reasonable; therefore, the pipeline is more compact; the dead space amount is reduced; the ventilation and oxygen supply effects are improved; and meanwhile, the oxygen supply device can be connected with various oxygen supply devices with standard connectors, such as masks and nasal masks, is wider in applicability, and can adjust the oxygen concentration of inhaled air oxygen to be in a reasonable range according to clinical requirements.

A method and apparatus for providing ventilatory assistance to a spontaneously breathing patient an error signal (56) is computed that is the difference between a function of respiratory airflow (54) over a period of time and a target value (52). Using a servo loop, air is delivered to the patient at a pressure that is a function of the error signal, the phase of the current breathing cycle, and a loop gain that varies depending on the magnitude of the error signal. The loop gain increases with the magnitude of the error signal, and the gain is greater for error signals below a ventilation target than for error signals above the ventilation target value. The target value (52) is an alveolar ventilation that takes into account the patient's physiologic dead space.

The invention discloses a medical positive-pressure protective helmet capable of adjusting an air supply angle, belongs to the field of respiratory protection, and aims to solve the problems that the air supply angle of a common medical positive-pressure respiratory protection device is limited, the internal CO2 concentration is reduced slowly, and the internal gas fluidity is poor, so that a dead cavity exists, the CO2 concentration at the dead cavity is high, and the safety is high. According to the medical positive-pressure protective helmet capable of adjusting the air supply angle, an adjusting device is additionally arranged on the basis of an existing positive-pressure type respiratory protection device, so that clean air flowing through an air supply pipeline is adjusted through a spoiler after passing through the adjusting device, and then the air supply angle is adjusted through the spoiler; according to the medical positive-pressure protective helmet, air enters the face screen at multiple angles, the gas flowability in the face screen of the medical positive-pressure protective helmet is improved, formation of a dead cavity in the face screen is reduced, the conditions of uneven pressure distribution and uneven CO2 concentration distribution in the face screen are improved, and the using effect and comfort of a wearer are enhanced.

The invention relates to an injection type carbon dioxide regulator for a breathing machine, and aims to solve the technical problem of man-machine confrontation easily caused by providing carbon dioxide for a patient under the assistance of the breathing machine clinically in the prior art. According to the technical scheme, the injection type carbon dioxide regulator comprises a barrel, a piston, a hollow shaft push rod and a plurality of clamping strips, a hollow shaft through hole is formed in the middle of the top face of the barrel, clamping grooves for fixing the clamping strips are formed in the positions, located at the two ends of the hollow shaft through hole, of the top face of the barrel, and a trachea cannula connector integrated with the barrel is arranged at the bottom end of the barrel;the piston is arranged in the barrel; the hollow shaft push rod is inserted into the hollow shaft through hole and penetrates through the middle of the piston, the lower end of the hollow shaft push rod is flush with the bottom face of the piston, the top end of the hollow shaft push rod is a respirator connector and exceeds the top face of the barrel, and the clamping strips are evenly arranged on the two sides of the outer wall of the hollow shaft push rod. According to the invention, the volume of the breathing dead space can be adjusted by adjusting the up-and-down movement of the injection piston, so that the reutilization of carbon dioxide is increased.

Systems and methods for non-invasive ventilation are provided. The systems may include a gas source that provides breathing gases to a patient through one or more of a primary flow path (PFP) and a flushing flow path (FFP). The system may include a control assembly configured to open and restrict gas flow through the PFP. When the PFP is open, a significant portion of the gas flows through the PFP while the remaining gas flows through the FFP. When the PFP is restricted, a significant portion of the gas flows through the FFP. Increased flow through the FFP may have a high velocity (especially relative to the flow through the PFP). Gas delivered through the FFP may be used to flush dead space. One or both flow paths may contribute to inspiratory positive airway pressure (IPAP), expiratory positive airway pressure (EPAP), and / or positive end expiratory pressure (PEEP).

The invention belongs to the field of animal anesthesia, and particularly relates to an animal anesthesia machine. Comprising a bottom plate, a stand column is fixedly connected to the top end of the bottom plate, a cross beam is fixedly connected to the top end of the stand column, an anesthesia loop block is fixedly connected to one side of the outer wall of the cross beam, a switching valve is arranged on one side of the outer wall of the anesthesia loop block, and a soda lime box is fixedly connected to the bottom end of the anesthesia loop block. An anesthesia loop block is connected into the module, then a conventional circulating breathing loop pipe is connected into an air inlet port and an air outlet port of the module, a non-rebreathing type direct anesthesia mode can be achieved, when the direct current module is used, the breathing loop pipe applied in the rebreathing type circulating anesthesia mode can be shared, and the purpose that under low air resistance, the direct current module can be used for direct anesthesia is effectively achieved. The invention relates to non-rebreathing type direct anesthesia of a low dead space of a small animal.

The invention discloses a medical alveolar gas collecting device which comprises a three-way pipe, a dead space gas collecting bag and an alveolar gas collecting bag, wherein the dead space gas collecting bag and the alveolar gas collecting bag are communicated with the three-way pipe; the three-way pipe comprises a main pipe, a first branch pipe and a second branch pipe, the second branch pipe and the first branch pipe are arranged at intervals and arranged at the rear end of the main pipe in the air inlet direction. The end, away from the main pipe, of the first branch pipe is in closed communication with the alveolar gas collecting bag through a first valve. The end, away from the main pipe, of the second branch pipe is in closed communication with the dead space gas collecting bag through a second valve. According to the device, pure alveolar gas can be collected, and the purity of a sample is controlled from the source, so that the precise test problem of VOCS gas detection in the medical field is ensured; meanwhile, a pure physical structure design is adopted, so that the complexity of sample collection is avoided, and the test cost and time are greatly saved.

Ventilator system with multiple inspiratory lumens is provided. The inspiratory lumens are configured so that separate inspiratory lumens provide inspiratory gas mixtures to separate portions of a patient's airways, for instance to separate lungs and / or bronchi. The ventilator system can include one or more expiratory lumens to evacuate expiratory gases from airways. The use of separate inspiratory lumen(s), with expiratory lumen(s), allows for functional separation of structural portions of the lungs, and maintenance of continuous or almost continuous flow through at least part of respiratory cycle via inspiratory and expiratory lumens. This can further reduce dead space and clear suspended therein diseases causative agents with improvement in outcomes, reduce risk of cross-contamination or cross-infection between different parts of airways, for example such as cross-infection from one lung lobe to another lobe or. The ventilator system allows for independent titration of PEEP, pCO2 and pO2 with no need for permissive hypercapnia.

An ambulatory assist ventilation (AAV) apparatus and system are disclosed for the delivery of a respiratory gas to assist the spontaneous breathing effort of a patient with a breathing disorder. The AAV system includes a compressed respiratory gas source, a respiratory assist device for controlling respiratory gas flow to the patient, a patient circuit tubing and a low profile nasal interface device, which does not have a dead space or hollow area where C02 can collect, for delivering the respiratory gas to the patient, wherein the nasal interface device is fluidly connected to the respiratory assist device via tubing for receiving the respiratory gas therefrom. In some cases, the nasal interface device may be used in combination with other gas sources, such as oxygen concentrators, to provide dual therapy capability suitable for some applications.

A novel method and apparatus for analyzing multi-breath nitrogen washout (MBNW) data from a lung is provided. The novel method includes fitting multi-compartment lung model, having five free parameters, to an exhaled nitrogen concentration profile over the entire duration of expiration for each breath from the lung. The five free parameters include 1) functional residual capacity, 2) dead space volume, 3) the standard deviation of the rate of change of fractional contribution to expired flow from each lung region as a function of lung volume, 4) the intrinsic slope of Phase-Ill due to acinar asymmetry, and 5) the coefficient of variation of regional specific ventilation.

A patient interface includes a cushion assembly adapted to form a seal around the patient's nose and / or mouth and a gas washout vent configured to allow a flow of patient exhaled CO2 to an exterior of the patient interface to minimise rebreathing of exhaled CO2 by the patient. The cushion assembly defines a plenum chamber pressurised at a pressure above ambient pressure in use. At least one volume reducing member is provided within the plenum chamber to reduce an effective internal volume of the plenum chamber. The at least one volume reducing member is arranged to separate a main volume of the plenum chamber for delivery of the therapy pressure from deadspace volume provided at least superior the entrance to the patient's nasal passages. The main volume is adapted to be in direct fluid communication with the patient's nose and / or mouth and the vent.