53results about How to "Prevent invagination" patented technology

The disclosure presents methods and systems for applying a suction force to a surface of a left atrial appendage (LAA) with a plurality of tubes. A method may include puncturing the surface of the LAA using a tissue-penetrating tip while the suction force is applied to the surface. The disclosure also presents methods and systems for inflating a first inflatable balloon within a cavity of a left atrial appendage (LAA). A method may include applying a suction force with at least one tube coupled to the first inflatable balloon to attract the first inflatable balloon to an interior surface of the LAA or to a second inflatable balloon.

The invention discloses a high-efficiency self-cleaning outdoor LED display screen. The structure includes an automatic screen cleaning device, a display screen body, and a display screen box. Compared with the prior art, the screen automatic cleaning device connected mechanically with the display box has the beneficial effect of: having a self-cleaning function, using the cleaning cloth to wipe and clean the screen, and using the centrifugal force generated by the cleaning cloth to clean the screen. Get rid of the dirt on the screen, and the built-in spring of the double-layer soft cloth makes it stiffer, preventing the double-layer soft cloth from sinking when encountering large dirt, which is more conducive to cleaning the screen. When cleaning, use electric heating rods and spring heat It is passed on the double-layer soft cloth, which indirectly makes the solvent heated to increase the enzyme activity to improve the cleaning degree. After cleaning, the double-layer soft cloth is heated to keep it dry. The cleaning effect is good, and it can effectively prevent the LED display from being unclear, mosaic, etc. Phenomenon.

The invention relates to the technical field of road engineering and discloses a pervious asphalt concrete structure. The pervious asphalt concrete structure comprises a pervious asphalt concrete layer and a pervious cement concrete layer; an airflow dispersion layer is laid between the pervious asphalt concrete layer and the pervious cement concrete layer; an airflow air drying layer is laid at the bottom of the pervious cement concrete layer; a plurality of groups of step type air dispersion pipelines are arranged in the airflow dispersion layer in the transverse direction in the form of a straight line; the step type air dispersion pipelines extend into the pervious cement concrete layer to be in contact with the airflow air drying layer; air guide plates are in contact with both left and right edges of each group of step type air dispersion pipelines in the airflow dispersion layer; and the two adjacent groups of air guide plates form a triangle together with the pervious cement concrete layer. According to the pervious asphalt concrete structure, the problem that roads are slippery and icy because water on pavements cannot be effectively removed in rainy seasons and continuouscloudy and rainy weathers in the prior art is solved; the pavements can be rapidly air-dried to avoid slipping of pedestrians and vehicles so that traffic accidents are avoided.

The invention provides a panel heat pipe with an embedded porous wick and a manufacturing method thereof. The panel heat pipe comprises an upper metal cover plate, a lower metal cover plate, and a closed cavity is formed between the upper metal cover plate and the lower metal cover plate in a welded and sealed mode. The cavity is filled with liquid working media. The inner surface of the cavity is divided into an evaporation face and a condensation face. The condensation face and the evaporation face are paved with a thin-layer porous wick structure formed by sintering metal powder particles. Sintering porous columns with inner grooves which are distributed in an array mode are machined on the evaporation face. Porous protrusions matched with the inner grooves are machined in the condensation face. The sintering porous columns and the porous protrusions are in close fit to form an embedded porous structure column. A working medium backflow channel is formed in the embedded porous structure column. According to the panel heat pipe, the capillary pressure is improved, the working medium backflow speed is remarkably increased, vapor-liquid two-phase separation is achieved, and the heat transfer performance is greatly improved; meanwhile, the embedded wick plays a supporting column role, and panel heat pipe inward sinking or crack deformation or other problems are effectively avoided.

The invention discloses a self-adhesive long-acting slow-release essential oil microcapsule and a preparation method and an application thereof. The method comprises the following steps of: uniformly mixing essential oil, a reaction monomer, an auxiliary emulsifying agent, oil-soluble initiator and a newly-added oil-soluble crosslinking agent to obtain an essential oil / monomer mixed solution; adding an aqueous solution of an emulsifying agent; pre-emulsifying in a shearing and stirring state for 10-20 minutes; performing ultrasonic dispersion in an ice-water bath to obtain a fine emulsified liquid; and performing a polymerization reaction on the fine emulsified liquid in a nitrogen atmosphere in a shearing and stirring state at the temperature of 65-70 DEG C for 3-6 hours, and cooling after finishing reaction to obtain self-adhesive long-acting slow-release essential oil microcapsule rubber latex. The preparation method has the advantages of ready availability of raw materials, simple process, high good controllability over the morphological structure of the microcapsule, no relevance to organic solvents and suitability for industrial production; and the prepared microcapsule has high structural strength, a good slow release effect, and high self-adhesive properties on substrates such as fibers and the like. The invention further discloses a self-adhesive long-acting slow-release essential oil microcapsule and an application thereof.