230 results about "Negative pressure ventilation" patented technology

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.

Methods and devices are provided that are effective to remove an obstruction in a human airway related to snoring and/or OSA. In one embodiment, the device includes a mouthpiece that is adapted to form a sealed cavity within a human mouth, and a hollow elongate member having a first end that is coupled to the mouthpiece and that is in communication with the sealed cavity, and a second end that is adapted to be coupled to a negative pressure generator. In use, a negative pressure generator can be attached to the hollow elongate member to create a negative pressure in a human mouth in response to an obstructed airway, thereby removing the obstruction. In particular, this device is effective to pull a patient's tongue and/or soft tissues of the upper airway up and away from the posterior pharyngeal wall to reopen the airway.

The method provides a dry vertical shaft storage system for spent fuel of a nuclear power station and a storage method thereof. The system comprises a loading subsystem, a storage subsystem, a reloading subsystem, a transferring subsystem, a residual heat discharge subsystem, a negative pressure ventilation subsystem, a fuel suction subsystem and an air blowing subsystem. The system saves a water-cooling system and a water purification system on the basis of the water storage method; the storage vertical shaft is arranged underground, so that the influence of an external event can be effectively prevented, such as airplane crash; when the spent fuel needs to be transferred, a spent fuel storage tank can be taken out of a storage depot, and then directly loaded in a spent fuel shielding transport cask through lifting equipment so as to be conveniently transported; a plant and structural equipment are not polluted by radioactive materials, so the spent fuel storage depot can be normally disassembled and retired after the spent fuel storage tank is transferred; radioactive decontamination is not needed and the spent fuel storage depot can be conveniently retired; and the storage tank can be processed in different phases to reduce initial cost according to the operation of the power station.

The invention relates to a biological safety protection cabin which is characterized by comprising an upper cabin body, a lower cabin body, a central control system and a negative pressure ventilation purification and disinfection system, wherein the upper cabin body comprises a closed negative pressure cabinet; the front and back sides of the negative pressure cabinet are respectively provided with at least one transparent window and an oversleeve operation port; the left and right sides of the negative pressure cabinet are respectively provided with a transfer window; the negative pressure ventilation purification and disinfection system comprises primary and secondary exhaust high-efficiency particle filters, an exhaust fan, a first tee joint, a pipeline electric closing valve, a second tee joint and a primary blowing high-efficiency particle filter which are sequentially connected through a ventilation pipeline; the third end of the first tee joint is connected with a laboratory exhaust system through an exhaust electric closing valve; the third end of the second tee joint is connected with a blowing fan through a blowing electric closing valve; the middle part of the ventilation pipeline is connected with a gas disinfection plant through a disinfection electric closing valve; an air inlet end of the primary exhaust high-efficiency particle filter is communicated with an air outlet of the upper cabin body; and an air outlet end of the primary blowing high-efficiency particle filter is communicated with an air inlet of the upper cabin body.

The invention discloses a negative-pressure ventilation type pig raising system based on a biological fermenting bed, comprising an enclosure, a roof and a pig raising yard, wherein the enclosure is built by construction materials; the roof is arranged on the top of the enclosure; and the pig raising yard is arranged in the enclosure. The enclosure is manufactured by hollow bricks and a double-layer wind tunnel hollow wall body is designed, the double-layer wind tunnel hollow wall body is communicated with an air intake channel at the groundsill, and a spray device is arranged at a wind tunnel port; the roof is designed by adopting roof heat insulation, such as multi-housing construction and the like, and the top part is provided with an exhaust fan and an air hole; and the pig raising yard is a microorganism fermenting bed pig raising yard which is a rectangular single-column yard, a cement passage is arranged at one side of the enclosure, and the rest of parts are the microorganism fermenting bed, and automatic feed boxes are arranged at the two ends of the cement passage. By adopting the pig raising system of the invention, zero emission of pig dung is realized in the true sense, the cleaning sanitary level of a pig field is improved all around, the feed utilization ratio is improved, the occurrence and spreading of diseases are effectively reduced, the pork quality is increased, the hog in-yard time is decreased, labor production ratio is improved, and the cost consumption of water, electricity and the like is reduced.

The invention discloses a dual negative pressure adjustable wound negative pressure therapeutic instrument based on a microprocessor core, comprising an internal negative pressure source, an internal negative pressure control unit, an external negative pressure interface, a regulating valve, an external negative pressure control unit, a wound Drainage device, negative pressure detection unit, flow rate and flow rate detection unit and alarm unit; internal negative pressure control unit and external negative pressure control unit respectively control internal negative pressure source and external negative pressure source to generate negative pressure at the wound, wound drainage device The generated lactic acid metabolites are drained, the negative pressure detection unit detects the pressure at the wound, the flow and velocity detection unit detects the drainage volume and drainage speed at the wound, and the detected signal is fed back to the internal negative pressure control unit or external negative pressure control unit , the control unit controls the negative pressure source according to the feedback signal; when the wound causes massive bleeding, the alarm unit sends out an alarm signal. The present invention can use a negative pressure pump or a hospital negative pressure system as a negative pressure source, which can be flexibly selected in practical applications.

The invention discloses a device and method for disassembling a low-radioactivity gather type waste filter. The low-radioactivity gather type waste filter to be disassembled is placed into a disassembling system, after an outer package is removed, a bottom seam cutting machine, a top seam cutting machine, a vertical seam cutting machine and a transfer tray are cooperated for carrying out bottom seam cutting on the front handle end face, top seam cutting on the air exhaust top face, vertical seam cutting on the front handle face and vertical seam cutting on the rear handle face of a metal shellof the low-radioactivity gather type waste filter, the front handle face and the rear handle face are separated in first batch, a core is recycled after cut, and the metal shell and glue attached tothe metal shell are heated in a tunnel type drying oven and subjected to glue shoveling treatment through a glue shoveling negative pressure ventilation cabinet to be classified and recycled. The gather type waste filter can be disassembled before waste treatment, meal materials and nonmetal materials are classified, and the device and method have the advantages of being high in automation degree,high in efficiency, safe and environmentally friendly, saving energy and the like.

The invention relates to a method for preventing gas from being accumulated at corners on coal faces. A process tunnel is added on the basis of an original 'U'-shaped mining gateway, and is placed at the top of a coal seam, and is close to the inner side of a return airway and parallel to the return airway and an intake airway, and the intake airway is respectively communicated with the return airway and the process tunnel via working surfaces so as to form two 'U'-shaped ventilating channels; and the process tunnel not only can realize total negative-pressure ventilation, but also realizes local fan ventilation. A drill site is further arranged in the process tunnel, gas is extracted, and water or stopping liquid is injected into the coal seam. The process tunnel is added on the basis of the original 'U'-shaped mining gateway to form the double 'U'-shaped ventilating channels, return air of the original return airway is divided, and accumulation of gas at corners on a return air area is avoided; and the drill site further can be arranged in the process tunnel to extract gas of the coal seam, an adjacent layer and a worked-out section, or the water or stopping liquid is injected into the coal seam, the purposes of dust fall and fire prevention are achieved, and production is not affected.

The invention discloses a shaking suction cup. A cup body of the suction cup is provided with a micro direct-current electric shaker mainly; and the cup body of the suction cup is of a piston type or an air suction type. After the cup body is adsorbed on a human body and then is electrified with a direct current power supply, the cup body generates the shaking; and an acupuncture point which is subjected to negative pressure adsorption by the suction cup has local hyperaemia and also generates the shaking to ensure that the position of the acupuncture point has effects of promoting blood circulation and removing obstruction in channels at the same time, thereby achieving better medical effect.

The invention discloses a therapeutic apparatus for the dental department. The therapeutic apparatus comprises a host, a connecting pipe and a handle which are connected in sequence. An ozone generator and a mixer are installed in the host, the ozone generator and a liquid medium are connected to the input end of the mixer, and the output end of the mixer is connected to the connecting pipe. According to the therapeutic apparatus, a local administration space is formed through an injection needle and a negative pressure suction opening at the front end of the handle, washing and negative pressure suction are both achieved, operation is simple and easy to implement, and the therapeutic apparatus can be used for treating periodontitis, pericoronitis, gingivitis and mucosal diseases; the therapeutic apparatus is used for root canal therapy and negative pressure suction which are better than conventional natural drainage, and a better removing effect is achieved on inflammatory substances which are in root canals and side wall root canals and are difficult to suck out at the normal temperature.

The invention relates to the technical field of mining engineering, in particular to a support method for a withdrawing channel. The support method achieves full-negative-pressure ventilation during highly gassy mine fully mechanized coal mining face support withdrawing. After lasting mining of a fully mechanized coal mining face is ended, the self-excavation withdrawing channel is formed through coal cutting of a coal cutter, high-strength anchor rod (cable) support is performed on the withdrawing channel, the roadway retaining mode of driving nogs behind a sheltering frame is omitted, and one-off support is utilized for achieving full-negative-pressure ventilation during support withdrawing. According to the top plate structure of the withdrawing channel, the method of high-pre-stress anchor rod (cable) support is adopted for surrounding rock control. Anchor rods (cables) are adopted for supporting the withdrawing channel in a cantilever mode, nog construction in a traditional support withdrawing mode is basically eliminated, and support strength can meet the requirement for a ventilation section in full-negative-pressure support withdrawing. Through innovating the full-negative-pressure withdrawing channel support mode, the labor intensity is lowered to the maximum degree, the support withdrawing efficiency is improved to the maximum degree, and finally the safe, efficient and economical support withdrawing mode is achieved.

The invention discloses a disposable high negative pressure drainage device. The disposable high negative pressure drainage device comprises a high negative pressure drainage bottle and a drainage needle; the high negative pressure drainage bottle contains a transparent bottle body; by a partition plate, the interior of the bottle body is divided into two or more high negative pressure spaces which are not communicated inside the bottle body; a drainage catheter with a switch device is correspondingly arranged on the bottle body above each high negative pressure space and connected with the drainage needle; through puncturing the position to be drained, the drainage needle conducts drainage under the negative pressure action in the high negative pressure drainage bottle. According to the scheme, the disposable high negative pressure drainage device can correspond to two wounds, thereby reducing the quantity of the high negative pressure drainage bottles used on a patient body, facilitating the movement of the patients, and saving the medical cost; and the drainage needle can reduce the wound to the patients through pulling out a needle core and utilizing a needle tube for drainage, facilitates the drainage of an indwelling catheter, and the drainage efficiency can be improved.

The invention relates to an underground coal mining method, in particular to a Z type horizontal stratification top coal caving coal mining method in a half-edge thick coal seam. The method comprises the following steps: arranging an alley way, comprising tunneling a roof alley along the roof of the coal seam, setting wind and water pipelines and liquid inlet and outlet high pressure pipes in the roof alley, arranging a communication system, and paving a scraper conveyor; using the roof alley as a wind inlet alley, a transport alley and a safety exit; reserving a bottom board alley along the coal seam at the back of a mining working face so that two safety exits are formed on the mining working face; using the bottom board alley as a wind return alley and a safety exist so that the wind inlet alley is separated from the wind return alley; mining, comprising moving the tail of a scraper conveyer in the roof alley; moving the scraper conveyer on the working face; detaching a trapezoid support in the roof alley; carrying out coal breakage; moving the support; and carrying out gob-side entry retaining. According to the method, the arrangement of the alley is improved, the production system is optimized, and full exhaust ventilation of the working face is realized.

The present invention is related to patient interfaces, such as nasal masks (2), particularly though not solely for use in providing continuous positive airway pressure therapy or positive pressure ventilation to patients suffering from obstructive sleep apnoea. In a first form the invention is a patient interface that has securement means (601) releasably attaching the interface to headstraps wherein the securement means (601) is slidably engaged with the patient interface. In a second form of the invention the mask headgear is formed of a plurality of straps (701, 702) where at least one of the plurality of straps is slidably engaged with another of the plurality of straps. In a further form the patient interface may be provided with vertically adjustable engaging means (802) that engage the patient interface with the headgear straps.

The invention discloses a negative pressure ambulance, which comprises an ambulance body, a head cover, an air pipe, and a negative pressure purification system in the ambulance, wherein the head cover is semiclosed, the back part thereof is provided with an air outlet; the air outlet is connected with the negative pressure purification system in the ambulance through the air pipe. The negative pressure ambulance has the advantages that: 1, the air exhausting and air exchanging efficiencies are high, and the movement of people around cannot influence the air exchanging effect and efficiency. Air current which is at the periphery of the head cover and enters the head cover is very obvious and stable, so that the air breathed out from the mouth of a patient cannot diffuse into a medical cabin, and the possibility of cross infection between doctors and patients is controlled; 2, the negative pressure ambulance is simple to manufacture, can be made by reconstructing a conventional general vehicle without adding the tightness of the conventional vehicle, and avoids additional reconstructing difficulties and cost caused by achieving a negative pressure standard in the cabin of the negative pressure ambulance; 3, the comfort level of the patient is improved greatly; and 4, the negative pressure ambulance is convenient to use; and the head cover can be matched with various styles of stretchers, so the adaptability is wide.

The present invention discloses a negative pressure drainage dressing having attraction and flushing functions. The negative pressure drainage dressing comprises a sponge body and at least one drainage conduit; one end of the drainage conduit is inserted into the sponge body; the other end of the drainage conduit is connected with a negative pressure source; and a conduit wall of the drainage conduit inserted into the sponge body is provided with a plurality of negative pressure attraction through holes. The negative pressure drainage dressing also comprises a perfusion pipeline, the perfusion pipeline is inserted into the sponge body and capable of injecting flushing liquid or soup into the sponge body to intervene in a wound, and negative pressure attraction of the wound secretion, the flushing liquid and the soup in the sponge body can be carried out by the drainage conduit. The negative pressure drainage dressing has the advantages that the liquid can be injected to the wound, the wound can be wetted and cleaned, the efficiency of attracting the secretion and edema liquid is higher, the wound can be intervened, and inhalation channels are not easy to be blocked.