35results about How to "Avoid stress shielding effects" patented technology

The invention provides a spinal fixation device, and belongs to orthopaedic implants. The spinal fixation device comprises a bone lamella and screws, lamella holes are formed in the upper surface and the lower surface of the bone lamella in a penetrating mode, and the screws can be matched with the lamella holes. When the spinal fixation device is used, the screws penetrate through the lamella holes to fix the bone lamella on the bone, operation is easy, fixing is firm, and bone healing is facilitated.

The invention relates to a bionics design bone-line porous bone product and a preparation method and a purpose thereof, and belongs to the field of biomedical materials. The bionics design bone-line porous bone product is of a body-centered three-dimensional lattice micropore space structure, the atom positions of a unit body of the micropore space structure are filled by geometries, each geometry is a sphere casing or a sphere body, and is crossed with the surrounding sphere casings or the sphere bodies, and a through circular hole is formed in each crossing part. The bionics design bone-line porous bone product has the advantages that by utilizing a three-dimensional printing quick forming manufacturing technique, the excessive cutting waste is avoided, the utilization rate of material is high, and the processing is rapid; the bone-line porous bone nails, bars and plates prepared by the bionics design bone-line porous bone product are used for the human body hard tissue defect repair, bone tissue engineering stents, and bearing part bone tissue wound repair and reconstruction, the good structure integrity and shape customizing capability are realized, various shapes can be processed according to the patient bone tissue defect repair requirements, and the personalized medical requirements of the patient are met.

A compression device and method for interlocking compression nailing systems provide a compression force onto fracture site and a bone fixed between proximal and distal parts of intramedullary nail to prevent stress shielding and improve healing. The compression device having pre-assembled components of set screw, elastic component, distal cap and connector screw are rotated. After nail insertion, the nail is fixed to the bone fragments by inserting the fasteners into distal bores and proximal slot. The compression device is inserted within the bore of the nail. The set screw is screwed to move elastic component and distal cap to push the proximal bone fragment distally. Distal cap overlies on fastener screw shaft to spread compression forces in fastener screw surface to prevent stress concentration. After fracture gap minimization, the set screw is screwed further to compress elastic component to provide desired compression force.

Slide steel plate is characterized by comprising a grooved elongated steel plate and a screw. The groove of the grooved elongated steel plate is an elongated through groove. Elongated recesses are arranged on the elongated steel plate on two sides of the elongated through groove. The screw comprises a locking screw and a positioning screw. The locking screw comprises a threaded screw body, an outward-protruding positioning step and a slide column, wherein a recess is arranged at the end of the slide column. An inner threaded hole is arranged at the upper end of the locking screw. The positioning screw comprises a screw head and a screw body. Compared with the prior art, the firm fixation is provided at early stage, stress shielding is avoided at middle and late state, individual pressurizing is provided, and the slide steel plate is applicable to traumatic fracture and bone ununion.

The invention relates to a silicate coating-containing absorbable medical magnesium-based metal, a preparation method and application thereof. The magnesium-based metal belongs to the field of biomedical appliances and is particularly suitable for the field of medical appliances used for bone trauma surgery, reparative and reconstructive surgery, and coining and cosmetology. The magnesium-based metal consists of a magnesium-based metal substrate and a silicate coating formed on the surface of the substrate, wherein the silicate coating consists of magnesium silicate (Mg2SiO4) and magnesium oxide. In an alkaline environment, a protective coating is prepared on the surface of the magnesium-based metal by a low temperature chemical deposition method. The method is simple and feasible and has low requirement on equipment; and the thickness of the coating can be controlled to be between several hundred nanometers and 5 mu m. The protective coating is uniform and dense, has high corrosion resistance, simultaneously has high biological activity and metal appearance, and can control the degradation rate of the magnesium-based metal and the dissolution rate of magnesium ions so as to control the biological activity and the absorption rate of magnesium-based metal implanted devices in organisms. The magnesium-based metal can be used for preparing intra-osteal fixing devices.