9results about How to "Improve initial stability" patented technology

This invention discloses a hip joint prosthesis for bone defects, comprising a crescent-shaped acetabular rim filler assembly, a bone-metal defect block, an acetabular wall defect support block, a cylindrical support block, an angle pad, a locking screw, a locking nut, an assembly screw, an acetabular sealing screw, and an acetabular support block. The crescent-shaped acetabular rim filler assembly includes two sets of crescent-shaped acetabular rim fillers, which are assembled by engaging pins through pin holes. The outer circumference of the bone-metal defect block of the acetabular support block is connected to the crescent-shaped acetabular rim filler assembly via bone cement. This hip joint prosthesis for bone defects effectively fills irregular defect areas of the acetabular rim. The various screw holes and Kirschner wire holes on its surface provide multi-dimensional fixation options. The overall structure, through the synergistic action of multiple components, achieves precise reconstruction while ensuring biomechanical performance, significantly reducing the risk of postoperative prosthesis loosening and wear.

This invention relates to the field of metal oxide technology, specifically to a highly dispersed nano-gadolinium oxide and its preparation method. The preparation method includes: activating surface sites through weak acid etching, pulsed ultrasonic depolymerization, and hydrothermal re-hydroxylation; adsorption using a polycarboxylic acid chelating agent; introducing hydrophobic chains and tertiary amine groups through sequential amidation; forming a strongly hydrated outer layer through beet alkalization; and finally, ultrafiltration desalting and concentration. The nano-gadolinium oxide dispersion obtained by this method has advantages such as narrow particle size distribution, low viscosity, good storage stability, and strong electrolyte resistance, making it suitable for high-end applications such as polishing slurries and coating precursors.

This invention discloses an experimental water tank system and a ship statics experimental teaching platform, belonging to the field of ship statics experimental teaching. The ship statics experimental teaching platform includes an experimental water tank system and an experimental ship model set within the experimental water tank system. In the experimental ship model, four transparent transverse bulkheads longitudinally divide the interior of the ship body into a bow compartment, three midship compartments, and a stern compartment. Two transparent longitudinal bulkheads laterally divide the bow or stern compartment into three areas, with the middle area being the bow area liquid tank. The middle compartment among the three midship compartments is the midship area liquid tank, which can be divided into two half-tanks or restored to a full tank via a vertically movable central bulkhead. A detachable grounding platform is used to ground the experimental ship model. This invention enables experimental teaching of ship static stability, first-type damaged stability, second-type damaged stability, third-type damaged stability, grounding, and mooring theories.

The application discloses an air duct mounting device and a mounting method, and belongs to the technical field of core unit assembly. The device comprises a main body driving assembly, a positioning and stopping assembly, a hook holding control assembly and an auxiliary operation assembly. The main body driving assembly comprises a rod, and a first handle is arranged on the upper portion of the rod. The hook holding control assembly comprises a hook claw arranged at the lower end of the rod and a hook rod penetrating the rod, a boss is arranged on the hook claw, the boss is used for being connected with a groove in the middle portion of the air duct during work, and the air duct is controlled to move up and down and rotate. One end of the hook rod is connected with the hook claw, a second cylindrical pin is arranged on the other end of the hook rod penetrating the rod, the second cylindrical pin is used for driving the hook rod to move up and down by control, and the boss of the hook claw is popped out or withdrawn. The positioning and stopping assembly comprises a stopping sleeve movably sleeved on the upper portion of the rod, and a second handle is arranged on the stopping sleeve. The stopping sleeve is matched with an end groove on the rear end face of the high-vortex first-stage disc rear shaft neck, so that stopping is realized during the tightening process.

The invention discloses a reed with good durability and a preparation method thereof, and relates to the technical field of reeds. The preparation method of the reed with good durability comprises the following steps: taking raw materials, smelting the raw materials in an argon atmosphere, and casting and cooling the raw materials to obtain a cast ingot; the cast ingot is subjected to homogenization treatment, surface milling is conducted after furnace cooling, and then blooming is conducted; annealing is carried out after primary rolling, finish rolling is carried out, a thin strip is obtained, stamping cutting and annealing are carried out, and a rough reed is obtained; the rough reed is taken, cleaned, dried and polished and then placed in a passivation solution to be soaked, and the finished reed is obtained; the passivation solution comprises the following raw materials in percentage by mass: 1-4% of benzotriazole, 0.3-0.5% of a surfactant, 2-5% of a corrosion inhibitor, 12-15% of phytic acid, 1-2% of citric acid, 2-5% of ethanol and the balance of deionized water. The finally prepared reed has a hydrophobic surface and good corrosion resistance.

This invention discloses a porous personalized implant and its manufacturing method. The porous personalized implant includes an abutment and an implant body. The abutment is disposed on top of the implant body and connected to it via a neck. A threaded, porous layer is formed directly on the outer surface of the implant body. The porous layer is helical and has a non-uniform curved surface structure, resulting in an uneven surface. A porous support region is also provided on the outer surface of the neck, passing through the neck and communicating with the porous layer on the outer surface of the implant body. The porous personalized implant of this invention is integrally molded. The porous structure adopts the G-surface structure of the three-period minimal surface, solving the stress shielding and stress concentration problems of existing dental implants. Furthermore, it shortens the surgical cycle while reducing damage to the surface treatment layer during implantation, improving the osseointegration performance of the implant and meeting the needs of different patients.

This invention relates to the field of medical device technology, and discloses a 3D-printed humeral prosthesis that preserves the shoulder joint. The prosthesis includes a prosthesis body, with a proximal end for connecting to the humeral head of the patient's own shoulder joint. The proximal end of the prosthesis body is ball-shaped, and a connection area is provided at the top of the proximal end, with multiple nail-like protrusions. The proximal end of the prosthesis body also has through-holes perpendicular to the connection area. The ball-shaped proximal end of the prosthesis body of this invention, with its connection area, connects to the humeral head of the patient's own shoulder joint, preserving the patient's own shoulder joint, maintaining the patient's natural range of motion and function, reducing damage to surrounding tissues, facilitating more natural movement and recovery of daily activities, and improving postoperative function. The ball-shaped connection has a large contact area, and the nail-like protrusion structure in the connection area of ​​the proximal end of the prosthesis body further increases the contact area, making the connection more stable; this contributes to the initial and long-term stability of the prosthesis implantation.

The utility model relates to the technical field of advertising equipment, and discloses a vertical advertising machine with an anti-toppling structure, which comprises an advertising machine body, an upper base is arranged on the lower side of the advertising machine body, a mounting component is arranged in the upper base, the lower side of the upper base is fixedly connected with a lower base, and the lower base is fixedly connected with the advertising machine body. A balance assembly is arranged on the lower side of the lower base, a balancing weight is fixedly mounted in the lower base, an open groove is fixedly formed in the lower base, a mounting base is arranged in the lower base, and a rotating shaft is fixedly connected into the mounting base. According to the advertising machine, the overall gravity center of the advertising machine is lowered through the balancing weight, the inclination sensor is matched to monitor the inclination state in real time, when abnormity is detected, the electric telescopic rod drives the supporting block to rapidly stretch out, the anti-skid rubber pad makes contact with the ground to form an additional supporting point, and the advertising machine is effectively prevented from toppling over; the anti-toppling performance of the advertising machine is greatly improved when the advertising machine is impacted by external force.

The present application relates to a kind of dental implants for repairing alveolar bone defect, the dental implant includes abutment, implant and side wing, three are integrally connected;The lower part of abutment is connected with the upper part of implant and is provided with side wing, the side wing is the integrated composite structure formed by reinforcing layer and porous layer.Two side wings of the dental implant are astride on alveolar bone surface, two side wings effectively disperse stress, and two side wings produce good clamping effect to alveolar bone, avoid making dental implant sink, rotate and loosen in bone alveolar bone, provide better initial stability.And the porous layer of side wing plays the role of bone graft, the shape and size of porous layer can be designed according to the shape and size of alveolar bone bone defect part.The implant of the dental implant and the porous layer of side wing have multi-scale aperture porous structure, promote bone tissue to grow into porous structure, so that implant and alveolar bone form bone integration, realize long-term biological fixation.