33results about How to "Reduced stress shielding" patented technology

A motion restoring intervertebral device includes first and second articulating components positioned between adjacent vertebrae with the articulating surface of the first component being formed by a circular domed convex projection having a first radius. The articulating surface of the second component is formed by a generally concave recess having the first radius in the medial-lateral direction and a second larger sweeping radius in the interior-posterior direction so that the components are capable of rotating against each other in all directions and translate against each other in the anterior-posterior direction, whereby translation away from the center of the first radius will produce device and joint distraction to limit excessive translation.

A articulating hemiarthroplasty prosthesis (10) for use in arthroplasty is provided. The prosthesis includes a stem (12) for implantation at least partially within the medullary canal (14) of a long bone (16) and a collar (20). The collar (20) is operably associated with the stem (12) and extends outwardly therefrom. At least a portion of the collar (20) includes a resorbable material. The prosthesis includes a head (30) and a cup (46) for engagement with the head (30).

Provided are devices for bone tissue engineering, comprising a metal or metal-based composite member comprising an interior macroporous structure with porosity varying from 0-90% (v), the member comprising a surface region having a surface pore size, porosity, and composition designed to encourage cell growth and adhesion thereon, to provide a device engineered for a particular recipient subject. Engineered devices may further comprises a gradient of pore size, porosity, and material composition extending from the surface region throughout the interior of the device, wherein the gradient transition is continuous, discontinuous or seamless to promote cell in-growth. Additional aspects provide methods for bone tissue engineering, comprising use of a metal or metal-based composite member comprising an interior porous structure, wherein the pore size, porosity and material composition is selected to provide a device having an optimal density and / or elastic modulus and / or compression strength for a specific recipient. Fabrication methods are provided.

Device for bone fixation with a head portion (5), a tapering front portion (8) and a shaft (3) between said head portion (5) and said tapering front portion (8), said shaft (3) having a distal portion (3a) adjacent to said tapering front portion (8) and a proximal portion (3b) adjacent to said head portion (5); whereby said distal portion (3a) being provided with a thread and having a constant outer diameter DA and an inner core diameter DI; at least the proximal portion (3b) of said shaft (3) has a core (2) consisting of a biologically non-degradable material with degradation rate BND and having a diameter d≤DI; a sleeve (9) surrounding said core and consisting of a biologically degradable material with degradation rate BD, whereby BD>BND and said sleeve (9) being fixed to said core in a non-rotatable manner.

The invention discloses an orthopedic implant device. The main body of the intramedullary nail adopts a core-shell structure. The main body core is laminated with continuous fiber composite materials to improve the bending strength. Fiber composite material to improve torsional strength. By forming an expansion cavity in the cap hole of the intramedullary nail body, and taking out the unit at the same time to form an expansion structure, the surface of the expansion structure fits or partially fits with the side wall of the expansion cavity, which increases the The shear force area, that is, correspondingly reduces the requirements for the shear strength of the material, and at the same time forms a clamping force between the two, and the combined application of the clamping force avoids the application of the take-out unit in the prior art when using continuous fiber composite materials. When on the main body of the intramedullary nail, the force is placed on the thread with low shear strength, causing the thread to collapse and / or spread.

A self-adaptive later-period stable type femoral stem prosthesis comprises a femoral stem prosthesis near-end part and a femoral stem prosthesis far-end part, wherein the femoral stem prosthesis near-end part is a solid body; the femoral stem prosthesis far-end part is of a controllable porous structure; the transition area of the femoral stem prosthesis near-end part and the femoral stem prosthesis far-end part is a boundary part; the controllable porous structure is constructed through porous subunits in an array mode; the porosities of the porous subunits at different positions of the femoral stem prosthesis far-end part are different; and modeling of the femoral stem prosthesis far-end porous part is achieved by arraying the porous subunits. The femoral stem prosthesis can reduce the femoral stem far-end elastic modulus, can achieve self-adaptive deformation according to the loads and surrounding bone morphology when being planted, improves the contact degree of the prosthesis near end and surrounding bone, promotes transferring of the loads to the near-end femur, avoids near-end bone loss caused by stress shielding, and reduces risks of near-end looseness and sinking.

A method for producing a customised orthopaedic implant is provided. The method involves scanning a bone from which a diseased region of bone will be resected to obtain a three dimensional digital image of an unresected volume of bone; scanning the bone after a diseased region of bone has been resected to obtain a corresponding three dimensional digital image of a resected volume of bone; and comparing the three dimensional digital image of the unresected volume of bone to the corresponding three dimensional digital image of the resected volume of bone to estimate a volume of bone that has been resected. The estimate of the volume of bone that has been resected is used to design a customised orthopaedic implant that substantially corresponds to the configuration of the resected volume of bone, the implant being configured to substantially restore a biomechanical function of the bone. Finally the customised orthopaedic implant is manufactured and provided for insertion into the resected region of bone.

The invention discloses a multi-material porous femoral distal implant and a manufacturing method thereof. The implant includes a hard gradient porous femoral distal implanted trunk and soft hydrogel cartilage; the hard gradient porous femoral distal The end-implanted torso is a porous structure, and the outer contour is divided into a conical femoral body and two spherical imitation femoral ankles; the soft hydrogel cartilage is two semi-circular coverings, respectively covering the two A simulated femoral ankle. The present invention adopts a bionic design combining hard materials and soft materials, which can imitate the structure of the normal distal femur of the human body to the greatest extent. By using the combination of soft materials and corresponding stem cells, tissue engineering can be used in After implantation, it stimulates the generation of capillaries and improves the adaptability of the implant in the human body. Moreover, the combination of hydroxyapatite and titanium alloy can avoid the brittleness problem of single-material hydroxyapatite implants.

The invention relates to an internal fixation system and a use method thereof. The internal fixation system comprises a bone fracture plate of an inert biological material and a bone fracture screw ofone or more capable of degrading a magnesium alloy, and may further comprise an internal fixation extraction forceps in actual use. The invention also discloses a use method of the aforementioned internal fixation system. The internal fixation system and the use method have the advantages of a traditional internal fixation system, and utilize the feature that the position that the bone fracture plate is in contact with the bone fracture screw easily generates galvanic corrosion so that corrosion residual screws can be simply and quickly cut off when taking out the bone fracture plate, and screw rod parts of the remaining bone fracture screws can remain in a human body, thereby reducing the hospitalization rate and hospitalization time of patients, and improving the surgical satisfaction of the patients.

The invention discloses a manufacturing method of an individualized customized knee joint topological optimization bionic prosthesis based on 3D printing, which relates to the technical field of medical artificial joints. The problem that the manufacturing method is urgently needed to reduce prosthesis looseness or fracture around the prosthesis is solved, and the method comprises the steps: establishing and assembling a tibia model and a knee joint prosthesis model, and performing finite element analysis and topological optimization; carrying out fairing; designing a specific structure of themodel, optimally reserving an internal region by adopting a solid structure, optimally reserving an outer layer region and optimally removing the region by adopting a grid structure, and forming a gradient between the regions; introducing back an assembly state of a tibia model, performing finite element analysis, comparing with a first finite element analysis result, judging whether 3D manufacturing and application are performed or not, and performing topological optimization again if the 3D manufacturing and application cannot be performed. The prosthesis prepared by the invention reduces the problem of prosthesis looseness or prosthesis peripheral fracture, provides space for ligament stop point implantation and internal bone grafting, is light in weight, and is beneficial to bone tissue ingrowth.