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

The present invention relates to biomedicine metal implant material, and is especially biomedicine implant material with controllable degrading rate and its application. The biomedicine implant material with controllable degrading rate has a magnesium or magnesium alloy matrix and a coated degradable polymer layer with thickness controlled within 0.01-5 mm. The biodegradation is completed step by step so as to ensure the mechanical performance of the material during degradation and match the degradation rate with the service period of the implanted device. The biomedicine metal implant material of magnesium or magnesium alloy may be used in preparing temporary or short term implanted device, such as degradable blood rack and peripheral rack, bone fracture plate and bone nail for inner fixing, tissue engineering rack, etc.

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 multi-segment implant assembly and a preparation method thereof, including an implant, a personalized abutment and fixing bolts, and the implant includes the first implant segment, the second implant segment, the third implant segment and the implant transgingival segment , the second implant section is a porous section, the implant body is provided with a threaded counterbore, and the upper end of the implant is provided with an abutment interface; the personalized abutment includes the crown connection section, the abutment transgingival section and the implant connection section, personalized The middle part of the abutment is also provided with a stepped hole, and the threaded end of the fixing bolt is threadedly connected with the threaded counterbore. The implant component can be customized according to the actual modulus of the patient's alveolar bone. The porous segment structure can effectively increase the contact area between the dense bone and the implant, improve the fit with the dense bone, and continuously stimulate the dense bone. The problem of looseness after installing the firmware is solved, the bonding force with the alveolar bone after implantation is improved, and the bone fusion effect is good; the preparation method has fast molding speed and short manufacturing cycle, and can meet the actual needs of different patients.

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.

A multi-segment through-hole porous dental implant, comprising a gingival section and a threaded section, the gingival section is a smooth solid structure, the gingival section is located on the upper part of the threaded section, and the dental implant also includes a porous structure section , the porous structure section is located at the bottom of the threaded section, and in the porous structure section, a porous structure with an increasing pore diameter is adopted sequentially from bottom to top; The holes are radial, and the individual transverse through-holes are distributed along the circumference. The invention provides a multi-segment through-hole porous dental implant that can effectively improve the bonding strength, increase the bonding speed, and easily realize the porous structure.

The invention relates to a magnesium / hydroxyapatite composite material and a preparation method thereof. The magnesium / hydroxyapatite composite material is prepared by mixing magnesium and hydroxyapatite serving as raw materials in a mass ratio of 80.5-99.9 percent: 0.1-19.5 percent for molding and sintering the mixture in a vacuum microwave sintering furnace. The composite material provided by the invention has proper mechanical property and can meet the requirements on human body bone tissue materials. A microwave sintering method is adopted, so the method has the advantages of high temperature rise speed, short sintering time, short preparation period, low energy consumption and no pollution.

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 method for forming a composite rhBMP-2 elasticity modulus graded porous titanium alloy support rod for the femoral head and the neck. Titanium alloy powder is prepared with an electrode induction melting gas atomization method, and the integrated elasticity modulus graded porous titanium alloy support rod consisting of a head part, a body part and a tail part is prepared according to actually measured biomechanical parameters of the femoral head, the neck and a rotor, wherein the head part and the body part are prepared by sintering the titanium alloy powder and pore-forming agents through the adoption of a cold rolling method, the tail part is prepared by directly sintering the titanium alloy powder, and the porous titanium alloy support rod is immersed in a rhBMP-2 / gelatin controlled release microsphere solution. The product prepared by the method can simulate the biomechanical properties of the femoral head and the neck of a human body to the utmost extent, thereby being beneficial to the stress transfer between materials and bone tissue interfaces, avoiding poor bone restoration caused by the stress shielding effect; and simultaneously, sustained-release microspheres on which bone induced growth factors (rhBMP-2) are loaded endue the materials per se with good bone conductivity.

The invention discloses an elastic interbody fusion cage having a biodegradable magnesium powder function reinforced high molecular material porous structure and a preparation method of the elastic interbody fusion cage. The elastic interbody fusion cage mainly consists of a main body part and a bone grafting part, wherein the main body part is a porous magnesium reinforced composite material hexahedron having gradient bore diameter distribution, and the bone grafting part consists of a plurality of bar-shaped sawteeth. A medical coating having a bone induction effect and an inflammation resisting effect covers the inner part and the surface of the fusion cage. The preparation method comprises the steps of performing high-temperature melting on PCL granules, mixing the melted PCL granuleswith magnesium powder to obtain composite material granules, and then performing integral shaping by a melting and deposition method. The elastic gradient bore diameter structure of the elastic interbody fusion cage disclosed by the invention is well matched with the elasticity modulus of human bones, and the fusion rate is increased. By the integral shaping method, the mechanical intensity of thefusion cage is increased, release of magnesium ions in the degradation process achieves the effect of acid and base neutralization, and the degradation rate is adjusted and controlled to be in a reasonable range.

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.