35results about How to "Effective mechanical support" patented technology

The present invention proposes a chip eutectic welding method, comprising the following steps: step (a), determining the size of the L-shaped ceramic positioning fixture according to the size of the gasket; step (b), using a laser machine to cut the corresponding size L-shaped ceramic positioning fixture; step (c), in the process of positioning the chip, first adopt the L-shaped ceramic positioning fixture to fix the gasket, then put the soldering piece on the gasket, and finally put the chip on the soldering piece; step (d) After the chip is fixed by the positioning fixture, put it into the vacuum eutectic furnace and use the welding tool for eutectic welding. In the chip eutectic welding method of the present invention, the L-shaped ceramic positioning fixture is prepared by a laser machine, which effectively solves the problem of misalignment between the chip and the pad during eutectic welding. The method is simple, low in cost, and strong in feasibility; Ceramics are used as the base material, which can provide effective mechanical support and have a wide range of applications.

The invention discloses a Zn-Li-Mn series zinc alloy as well as a preparation method and application thereof. It includes Zn, Li and Mn; in terms of mass percentage, the mass percentage of Li in the zinc alloy is 0-1%, but not including 0; the mass percentage of Mn in the zinc alloy is 0-1%, but not 0 is included; balance is zinc. The zinc alloy prepared by the invention has excellent mechanical properties, can provide long-term effective supporting force in vivo, has excellent cell compatibility and blood compatibility, and can be used for the preparation of biomedical implants.

The invention discloses a Zn-Mg1Ca series zinc alloy and preparing method and application of Zn-Mg1Ca series zinc alloy. The zinc alloy comprises Zn and Mg1Ca, wherein the mass percent of Mg1Ca in the zinc alloy ranges from 0 to 10% but not includes 0. The zinc alloy further comrpsies a microelements which are at least one of silicon, phosphorus, lithium, silver, tin and rare earth elements. The mass percent of the microelements ranges from 0 to 3% but not includes 0. The mechanical property of the Zn-Mg1Ca series zinc alloy meets the requirement for strength and toughness of medical implant materials, the Zn-Mg1Ca series zinc alloy is free of cytotoxicity on endothelial cells and bone-forming cells, can inhibit smooth muscle cell proliferation and has good tissue compatibility and blood compatibility, meanwhile, the Zn-Mg1Ca series zinc alloy can also be regulated to be degraded by body liquid, metal ions which are dissolved out can be absorbed and utilized by an organism or metabolized to be discharged out of the body, and the Zn-Mg1Ca series zinc alloy has good antibacterial performance and can be applied to preparation of medical implants.

The invention belongs to the technical field of roads and bridges, and in particular relates to a protective device at the upstream position of a bridge pier and a construction method. The invention provides a protection device arranged at the upstream position of the pier, which includes the pier fixed on the abutment, the pier is provided with a bridge body, and a protection device is provided at the upstream position outside the pier, and the protection device includes a pier fixed on the protection body The two side guards on the top, the two side guards extend radially outward, an angle is provided between the two side guards, and one ends of the two side guards are butted together or their extension lines intersect. The invention is arranged at the upstream position of the pier, and can block and divert the flood or mud flow from the upstream of the river. The process of the invention is simple and convenient to install, and can realize the purpose of protecting the safety of the bridge and improving the service life.

The invention discloses a rod-system pore structure for an orthopedic implant. The rod-system pore structure comprises a plurality of structural units, wherein each structural unit is formed by four rod pieces according to specific spatial positions; the structural units are combined into a three-dimensional space aperture structure system in a transformation or duplication way; the four rod pieces of each structural unit comprise a first rod piece, a second rod piece, a third rod piece and a Z rod piece; the rod-system aperture structure forms a specific shape according to actual clinical needs to form the orthopedic implant. The rod-system pore structure has structural characteristics similar to those of the bone trabecula of a human body, and is high in porosity, and an ideal spatial structure can be provided for the growth of new bones; in terms of mechanical performance, the rod-system pore structure is low in structural rigidity and strong in mechanical strength, stress shielding can be well reduced, and effective mechanical support can be maintained; the orthopedic implant formed by the rod-system pore structure has high mechanical performance and bone conduction and bone induction properties, and is widely applied to the clinical use of maintenance, support, repair and the like of human bones.

The invention relates to the preparation, product and application of a polyester / periodic mesoporous bone filling composite material whose degradation rate can be fluorescently marked. Firstly, rare earth periodic mesoporous nanoparticles with fluorescent properties were synthesized, then the rare earth periodic mesoporous nanoparticles were chemically modified with low molecular weight poly-L-lactic acid as a modifier, and finally added to the polyester matrix by solution blending middle. The product obtained by the above method and the application of the product as a composite bone filling material in bone repair are also provided. The fluorescent mesoporous material obtained by the method of the invention is evenly dispersed in the organic matrix, the mechanical properties of the polyester base are greatly improved, and the degradation behavior of the composite bone filling material can be monitored in real time. The preparation process is simple, and it can be used as a bone filling material for load-bearing bone parts with high performance index requirements. The obtained composite material can meet the requirement of clinical application.

The invention relates to a bionic artificial bone scaffold and a preparation method thereof. The method comprises the following steps: preparing material solutions A and B; utilizing an electrostatic spinning method to respectively prepare the material solutions A and B into a central channel layer and a peripheral column layer of a scaffold, wherein nanometer fibers in the central channel layer are in same spiral directions and the fibers in two adjacent nanometer fiber layers in the peripheral column layer are in opposite spiral directions; micro-level finely simulating a three-dimensional microenvironment of an osteon; hierarchically adding growth factors, supplying a differential inducing environment to seed cells BMSCs and constructing the bionic artificial bone scaffold with vascularizing tissues in the central channel layer and bone tissues in the peripheral column layer. The staggered orientation of the nanometer fibers in the scaffold can greatly enhance the structural stability; effective mechanic support is supplied to a bone defect part; the mutually connected network frame thereof is beneficial to cell permeation growth and blood vessel and nerve growth and also is convenient to transfer nutrient substances and metabolic wastes; the bionic artificial bone scaffold has ideal popularization and application values in the fields of biomedical materials and tissue engineering.