6results about How to "Small mesh" patented technology

The present invention belongs to the technical field of medical devices, and specifically relates to a hybrid braided stent. The hybrid braided stent includes a stent body, and the stent body is a single-layer structure. The stent body is a tubular structure formed by interlacing and weaving at least two filaments, and the end areas of at least two filaments are not exactly the same. The stent body of the hybrid braided stent of the present invention is formed by interlacing and weaving at least two filaments, and the end areas of at least two filaments are different. The filaments with larger end areas enable the stent body to have good supporting force, so as to fit closely with the blood vessels and achieve good positioning. The filaments with smaller end areas enable the mesh of the stent body to be smaller. After the stent body is installed in the blood vessel, the plaque is subjected to more uniform force and is not easy to break. Even if the plaque is broken, the stent body can effectively prevent the fragments of the plaque from flowing to the downstream of the blood vessel. In summary, compared with the prior art, the stent body of the present invention has better safety in use.

The invention discloses a ram base sand mold 3D printing modeling method. The method comprises the following steps that A, a casting process scheme is designed; b, designing a corresponding hollow sand mold structure according to the geometrical shape, the casting performance and the process scheme of the casting; c, making a model; d, the molten iron contact surfaces of all the sand molds are subjected to coating brushing treatment; e, box distribution; and F, box assembling and pouring. According to the invention, modeling-free modeling is realized, the molding cost can be saved by 450,000 yuan, meanwhile, the production period is obviously shortened, and the production efficiency is greatly improved. The 3D printer is adopted to print the sand mold, the size precision is high and can reach 0.3 mm, the gap is small during core assembly, positioning is accurate, and the quality of the mold cavity is guaranteed. And the sand mold design adopts a shape following design, so that the sand consumption is reduced, and the sand mold strength is ensured. The weight of each sand mold is small, the weight of the sand molds is reduced, the material cost is saved, operation is convenient, large hoisting equipment is not needed, the requirement for the equipment capacity is low, and the molding labor intensity is small.

This utility model discloses a clutch-operated chain-locking device for a tensioner or hoist, comprising a housing, a handwheel, a push-back lever, a locking block, an unlocking lever, and a clutch shaft, a rear reduction gear shaft, a clutch elastic element, and at least one clutch elastic element mounting seat mounted on a wall panel. The push-back lever is fixed to the handwheel and screwed into a screw hole in the housing. One end of the locking block is elastically pivotally mounted on the handwheel, and the other end is fixed to the unlocking lever, which rests in a limiting groove on the handwheel. The clutch shaft has at least one clutch shaft pinion. The rear reduction gear shaft has a rear reduction gear and a rear reduction gear shaft pinion. The sprocket shaft has a spline-connected final reduction gear, a sprocket, and a chain wound on the sprocket. The clutch elastic element abuts against the clutch shaft and the clutch elastic element mounting seat. This device ensures that the chain cannot be switched arbitrarily under load, guaranteeing safety during tensioning or lifting. It allows for unlocking and disengaging of the fast chain under no-load conditions.

A preparation method of the low-resistance resin comprises the following steps: (1) adding 22-26 parts by weight of monohydroxy acrylate, 15-20 parts by weight of butanol and 0.1-1 part by weight of a catalyst into a constant-pressure dropping funnel, slowly dropping into 43-45 parts by weight of isocyanate in a temperature range of 40-45 DEG C, and after the reaction reaches a theoretical reaction degree, adding a catalyst into the constant-pressure dropping funnel to react for 1-2 hours, thereby obtaining the low-resistance resin applied to steel mesh printing. Stopping the reaction; (2) adding 20-30 parts by weight of an unsaturated monomer and 0.5-1.5 parts by weight of a polymerization inhibitor into a product obtained after the reaction in the step (1), measuring the content of isocyanate groups, and stopping the reaction when the content is less than 2%; and (3) testing a product obtained after the reaction in the step (2), determining the solid content of the product, and adding 5-15 parts by weight of an active monomer diluent and 7-10 parts by weight of natural graphite according to the solid content to obtain the low-resistance resin applied to steel mesh printing.

The present disclosure relates to a neck aneurysm blocking device, comprising a plurality of layers of structures attached to each another. At least one structure has the shape of a metal mesh disc; the metal mesh disc is formed by interweaving metal wires; and the centers of the plurality of layers of structures are fixedly connected by means of a developing mark. During use, the sparser mesh discs of the plurality of layers of structures can be attached to an inner wall of an arterial aneurysm, and the denser metal mesh discs are fixed to a neck aneurysm, such that the blood flow in an aneurysm cavity is blocked, a stimulus to a blood vessel is reduced to the utmost extent, and complications are effectively reduced.

The utility model relates to the field of printing equipment, and discloses a printing ink circulating supply device which comprises a printing ink groove and a baffle, the baffle divides the printing ink groove into a supply groove and an overflow groove, a stirring mechanism is arranged at the bottom of the supply groove and comprises a rotating shaft and paddles, and the two ends of the rotating shaft are rotationally connected with the inner wall of the supply groove. One end, extending out of the supply groove, of each rotating shaft is connected with the output end of a motor, the multiple blades are fixedly arranged on the rotating shafts in rows, and the multiple rotating shafts are arranged at the bottom of the supply groove at equal intervals; in the two paddles located in the same row on the adjacent rotating shafts, the blade of one paddle can be cut into the space between the blades of the other paddle; all the rotating shafts rotate at the same frequency; the technical problem that in the prior art, ink is accumulated in an ink fountain and cannot be fully stirred or circulated is solved.