249 results about "Air leak" patented technology

Air leaks in a vacuum bag are detected using a leak detection film covering the inside face of the bag. The film includes a gas permeable binder carrying oxygen sensitive material that changes in physical appearance at the location of an air leak. The film may be adhered to the inside face of the bag or may form a separate membrane that is placed over a layup being molded in the bag. The film may be illuminated with light having a wavelength selected to cause the film to luminesce.

Techniques for treating visceral or parietal membrane and tissue defects include the application of a collagen biomatrix to the defect to repair and regenerate a visceral or parietal membrane, for example in patients suffering tissue defects or undergoing visceral or parietal surgical treatment. Such approaches avoid persistent tissue leaks and their consequences such as fluid leaks and air leaks. The use of collagen biomatrix, optionally in conjunction with a fibrin sealant, an anti-adhesive, or both, can minimize tissue leaks or fluid leaks in injured patients suffering tissue defects or subjects undergoing surgery such as visceral or parietal resections and other operations.

An embodiment of the present invention is a nasal cannula for delivering continuous positive airway pressure (“CPAP”) to a patient's nares during operative procedures or in critical care areas. A malleable metal or plastic is encased in the bridge of the cannula to allow it to be shaped to the patient's face. As a result of contouring the cannula to the face, air leaks are minimized allowing a seal to be provided when an op site is applied to cover the upper lip, nasal cannula and nose. The cannula's nasal inserts can end in nontapered or slightly tapered non-sealing beads, which may be slightly angled out to accommodate various facial anatomies. When approximately several liters per minute of oxygen are flowed through the cannula, CPAP is obtained.

Laser tissue welding can be achieved using tunable Cr⁴⁺ lasers, semiconductor lasers and fiber lasers, where the weld strength follows the absorption spectrum of water. The use of gelatin and esterified gelatin as solders in conjunction with laser inducted tissue welding impart much stronger tensile and torque strengths than albumin solders. Selected NIR wavelength from the above lasers can improve welding and avoid thermal injury to tissue when used alone or with gelatin and esterified gelatin solders. These discoveries can be used to enhance laser tissue welding of tissues such as skin, mucous, bone, blood vessel, nerve, brain, liver, pancreas, spleen, kidney, lung, bronchus, respiratory track, urinary tract, gastrointestinal tract, or gynecologic tract and as a sealant for pulmonary air leaks and fistulas such as intestinal, rectal and urinary fistulas.

A gas turbine engine includes a turbine rotor and a compressor, which provides discharge air. A nozzle, typically referred to a tangential on-board injector (TOBI), is arranged near the rotor to deliver the discharge air near the turbine rotor for cooling it. The TOBI receives pollution air leaking past seals within the gas turbine engine. The TOBI swirls the discharge air and the pollution air before it reaches the turbine rotor. The TOBI provides multiple passages separated by vanes. At least some of the passages include discharge inlets and outlets for carrying the discharge air from the compressor to the turbine rotor. Typically, several of the passages are unused and blocked. However, the example arrangement provides a pollution inlet and outlet in at least one of the normally unused, blocked passages. The pollution air flowing through its passage in the TOBI is swirled so that the pollution air that intermingles with the swirled discharge air, while minimizing the reduction in velocity of the discharge air that is used to cool the turbine rotor.

The invention relates to a method for testing the air leak rate of an air preheater, which is easy to implement, accurate and reliable and is suitable for analyzing and testing the air preheater. The accuracy of temperature measurement can reach 0.1 DEG C, the smoke venting temperature is within the range of between 100 and 200 DEG C approximately, and when a boiler runs stably, the smoke venting temperature is constant basically, so the relative accuracy of the temperature measurement is higher than the analytic accuracy of the oxygen content of smoke. Therefore the air leak rate, which is calculated according to the change of the smoke venting temperature, of the air preheater has the higher test accuracy. The method comprises the following steps of: 1) measuring the smoke venting temperature theta py of the air preheater and the temperature TKin of air entering the air preheater; and 2) utilizing a formula, namely when the change of the air leak rate is needed to be monitored due to the change of the air leak rate with the change of the running condition or equipment condition of the air preheater, measuring the air temperature TKin and the smoke venting temperature thetapy in the running state, which corresponds to the temperature thetapy, of the boiler, and calculating the air leak rate AL by the formula.

The present invention provides an improved inflatable compression dressing (10) for use in controlling swelling and promoting healing to wounds subsequent to surgery while allowing visual inspection of the wound during healing. The dressing comprises a bladder (138) formed by an outer wall (114) secured to an inner wall (112) to define an elongated, cup-shaped cavity for receiving an appendage (136); an air supply delivering air to the bladder; and a sensor monitoring air pressure within the bladder and indicating said air pressure to an air pressure control (140). The air pressure control provides air to the bladder at a rate which substantially matches air leaked from the bladder. Thus, the air supply inflates the bladder so as to provide uniform air pressure to the appendage, wherein the appendage is an arm or a leg.

A method for repairing pulmonary air leaks in a lung residing in a chest cavity and having an intake air stream and an outer surface is disclosed. An exemplary method comprises: introducing a first component of a biphasic sealant component as a liquid into the intake air stream of the damaged lung; ensuring that there is a pressure differential between the intake air stream and the outer surface of the lung; and introducing a second component of a biphasic sealant component into the chest cavity. The first sealant component collects at the air leak site and forms a sealant in combination with the second sealant component.

The invention discloses a face mask and leakage detecting method of face mask, which contains lid, wherein the mask possesses head coil or ear coil, which contains at least one fixed or replaced filtering device, the mask is composed of inner mask and transparent periphery around the inner mask, the filtering device is placed on the inner mask, the transparent periphery attaches the user face, which forms sealing edge with entire mask, the fine frosted pit is formed on the inner side of transparent peripheral back with external side as smooth surface or the back possesses real-time variation displayed covering layer. The invention can display connecting degree between mask and face, which monitors leakage condition effectively.

The invention provides a method for controlling goaf air leakage in the exploitation process of a shallow buried close-range coal seam. The method mainly comprises technologies such as plugging of earth surface air leaking fractures and detecting and plugging of downhole air leaking channel, namely, first, the widths of earth surface mining-induced fractures are measured and the speed of fracture air leaking is calculated; the fractures with the widths and the air leaking air speeds being out of gauge are plugged, an air inlet roadway and an air outlet roadway which are difficult to cave by a roof in a goaf is caved by a manual way, and air leaking toward the goaf is reduced; next, a beam tube monitoring system is used for monitoring the concentration of O2 in the goaf, and whether air leaking exists or not in the goaf is judged according to the concentration of O2; then, a tracer gas method is used for detecting air leaking channels of downhole coal pillars, the air inlet roadway, the air outlet roadway and the like, and corresponding plugging measures are adopted; and at the time of plugging, a fan-air-window combined pressure regulating method is used for balancing air pressure of the goaf and a working face, goaf air leaking is reduced, and coal spontaneous combustion in the goaf is avoided.

The invention belongs to a detection system (01) for a noninvasive ventilation interface and particularly relates to a detection system for evaluating the air leakage and the comfortableness of interfaces such as a nasal mask, a mouth-nose mask and a full-face mask (08) for noninvasive ventilation by combining three-dimensional structure characteristics of human heads. The detection system comprises a detection air source (02), a human head three-dimensional model (03), a simulation trachea (05), a lung model (04) and a micro processing unit (07), wherein the detection air source (02) can be used for generating a designated ventilation waveform; the human head three-dimensional model (03) can be used for detecting the surface stress; the simulation trachea (05) and the lung model (04) are connected with the human head three-dimensional model and allow sensors (06) to be placed; and the micro processing unit (07) can be used for evaluating the air leakage and the comfortableness of the head and the face. The air leakage is detected by comparing the preset ventilation waveform of the air source with the actually-detected waveform of the trachea model, and the stresses of the mask worn at different positions of the head are measured by a plurality of pressure sensors arranged on the head model and are compared with a human tolerance threshold, and thus the comfortableness of the mask is judged.

A method for measuring air leakage rate includes setting thermocouples separately at branch tube straight section of sintering air box and under grate of sintering machine to measure temperature t0 under the grate before air leakage and temperature tm at the straight section after air leakage, utilizing obtained t0 and tm to calculate out air leakage rate K by using formula of K=Co[(1-lambda)t0-tm]/Co[(1-lambda)t0-tm]+CA(tm-ta) where lambda-heat loss, Co-constant value, Ca- air specific heat and tA-temperature of air leaked in.

A method for detection and location of air leaks in a pressure vessel, such as a spacecraft, includes sensing structure-borne ultrasound waveforms associated with turbulence caused by a leak from a plurality of sensors and cross correlating the waveforms to determine existence and location of the leak. Different configurations of sensors and corresponding methods can be used. An apparatus for performing the methods is also provided.

Disclosed is a chest drainage system which reduces or eliminates pooling of blood/liquid and/or clogging/clotting in the drainage tube and/or chest tube, and provides objective and accurate measures of drained fluid volume and chest air leak. The chest drainage system continuously monitors chest tube and drainage tube status and clears pooled liquid in the drainage tube, and/or a clogged chest tube when necessary to restore negative pressure to the chest.

The invention relates to a ventilation system, of which the gas of an upper corner and a ventilation roadway is ultra-limit on a coal face, in particular to a high-position inclined E-type ventilation system of the coal face, and belongs to the technical field of coal mine safety equipment. A gas discharging high-position tunnel is formed between the ventilation roadway and an intake airway closed to a coal seam upper rock layer of the ventilation roadway, so as to form the high-position inclined E-type ventilation system with one intake airway and two ventilation roadways; the gas of a goaf can be restrained from pouring out to the upper corner and the ventilation roadway through adjusting the air quantity and air pressure of the ventilation roadway and the gas discharging high-position tunnel; and the gas of the goaf can be introduced to migrate to a gas special tunnel. The system uses a high-position tail tunnel, so that air leak congruence of the goaf is increased, and the gas accumulation of a U-type ventilation system is changed; and under the negative pressure of the ventilation system and/or the auxiliary extraction negative pressure functions, a high-position inclined E-type work face air power system is formed, so that the gas accumulation problem of the upper corner on the work face can be effectively solved.

Provided are compounds and methods useful for sealing air leaks in the thoracic cavity. Compounds and compositions of the invention comprise certain amphiphilic peptides, 8-200 amino acid residues long, that self-assemble spontaneously to form a gel in the presence of physiological pH and/or in the presence of a cation. In one embodiment, the peptide comprises a repeated sequence arginine-alanine-aspartic acid-alanine (RADA). Methods of the invention include a method of occluding a pulmonary air leak in a subject, comprising applying a compound of the invention to the site of a pulmonary air leak. The compounds and methods of the invention can be combined with other agents useful to treat cancer, inflammation, or infection.

Systems and methods related to polymer foams are generally described. Some embodiments relate to compositions and methods for the preparation of polymer foams, and methods for using the polymer foams. The polymer foams can be applied to a lung at or near an alveolar duct targeted for reduction, occluding the airway and leading to tissue necrosis because the foam prevents oxygenation of the tissue surrounding the duct. In some embodiments, the polymer foams can be formed within a body cavity (i.e., in-situ foam formation). In addition, the foam may form a seal, eliminating the source of air leaks.

The invention provides a condenser vacuum leakproofness detecting system and method. The detecting system comprises a vacuum pump, an air outlet measuring device and a computing device. The vacuum pump is connected with a condenser, the air outlet measuring device is installed on an air outlet pipe of an air-water separator of the vacuum pump, and the computing device is connected with the air outlet measuring device. The vacuum pump is used for discharging air leaking into the condenser and part of steam in the condenser, the air outlet measuring device is used for measuring the air content in a steam-air mixture discharged out of the air outlet pipe of the air-water separator of the vacuum pump, and the computing device generates a detection result about the vacuum leakproofness of the condenser according to the air content and a set condenser leakproofness standard. According to the condenser vacuum leakproofness detecting system and method, the vacuum leakproofness of the condenser can be accurately judged, and therefore a basis is provided for operation and maintenance strategy formulation of a unit. In addition, due to the fact that measurement is conducted at the air outlet position, normal operation of the unit will not be affected, and the situation that test accuracy is ensured at the cost of influencing stable operation of a power grid is avoided.

The system and method may measure and monitor physiological changes in a body. In some embodiments, the system and method may measure the impedance at a site in the body. In some embodiments, the system and method identify, quantify, and localize leaks from a site following surgery, measure cardiac contractility, or lung compliance. In an embodiment, the system includes a measuring device with one or more sensors embedded in a porous matrix. Changes in the electrical properties of one or more sensors may be used to determine the presence of leaks from a site following surgery, measure cardiac contractility, or lung compliance, depending on the position of the device.

The invention discloses leak detection equipment for a flexible packaging product. The leak detection equipment comprises a rack and pressurization equipment. The pressurization equipment is an air cylinder piston assembly capable of applying pressure on the flexible packaging product continuously, and the fixed end of the air cylinder piston assembly is fixedly connected with the rack. A detection platform where the flexible packaging product to be detected is placed is further fixedly arranged on the rack. The air cylinder piston assembly is connected with a pressure gage used for detecting pressure of an air cylinder. The air cylinder piston assembly adopted for pressurization can output pressure continuously with the pressure maintenance characteristic, and whether the packaging product leaks air can be detected more thoroughly through pressure detection, with a certain time length, on the packaging bag; besides, pressure changes of the air cylinder are detected through the connected pressure gage, pressure changes in the packaging product pressurized by the air cylinder are displayed accordingly, and therefore the sealing air leak condition of the flexible packaging product can be correctly reflected; manual direct leak observation is replaced with reading of the pressure gage, and therefore the leak detection equipment is more reliable and saves labor.

The invention provides a rotary type air pre-heater and a secondary air side air-leaking-reducing and plugging-preventing method thereof. According to the rotary type air pre-heater, a radially-extending fan-shaped partition plate is arranged in a secondary air inlet in the bottom of a secondary air bin and partitions the secondary air bin into fan-shaped heating partition bins. The secondary airside air-leaking-reducing and plugging-preventing method comprises the step that smoke gas with the temperature higher than 300 DEG C is utilized to heat a heat exchange element which rotates out of the secondary air bin and is about to rotate into a smoke gas bin. Through the technical scheme, according to the temperature of the heat exchange element of the cold end of the rotary type air pre-heater, the heating smoke gas quantity is adjusted, (NH4)HSO4 on the surface of the heat exchange element is dissolved through hot furnace smoke, the temperature of the heat exchange element of the coldend of the air pre-heater, and thus the problem of ash plugging of a rotary type air pre-heater is fundamentally solved. The furnace smoke is led into the secondary air side so that the combustion temperature of a hearth can be decreased, and the certain inhibiting effect on NOX generation caused by boiler combustion is achieved. Through the heating partition bins, the secondary air side and the smoke gas side are thoroughly isolated, and air leaking of the rotary type air pre-heater is reduced.

Medical devices and systems, and methods of their use, are disclosed having configurations suitable for obtaining biological tissue samples suitable for analysis, such as biopsy, while minimizing undesirable collateral damage to surrounding tissue or minimizing air leaks. Certain disclosed medical systems provide for obtaining biological tissue samples, while preserving organ functionality.