7 results about "Surface replacement" patented technology

The invention relates to the technical field of medical instruments, in particular to a hip joint thighbone prosthesis and a hip joint thighbone prosthesis manufacturing method. The hip joint femoral prosthesis comprises a spherical prosthesis main body and a connecting part, the spherical prosthesis main body is provided with an opening, one end of the connecting part extends into the spherical prosthesis main body and is connected with the spherical prosthesis main body, and the other end of the connecting part extends out of the opening; wherein the inner wall of the spherical prosthesis main body is provided with a functional gradient porous structure, and the porosity and the pore diameter of the functional gradient porous structure are gradually increased from the inner wall of the spherical prosthesis main body to the center direction of the spherical prosthesis main body in the preset direction. According to the hip joint thighbone prosthesis, the service life of a surface replacement type hip joint thighbone prosthesis can be prolonged, the problem that an existing biological fixation type prosthesis is loosened and loses efficacy due to stress shielding is solved, and the risk that a porous structure is prone to falling off from a base body in a long-term load environment is reduced.

The utility model belongs to the technical field of bolt jigs, and particularly relates to a bolt chamfering positioning jig which comprises a base and a support. The annular frame and the toothed ring frame are located at the left end and the right end of the base, a support is circumferentially installed in the space between the annular frame and the toothed ring frame, and an electric rotating part is arranged on the inner side of the lower end of the toothed ring frame to drive the toothed ring frame to rotate, so that the support is driven to rotate to replace bolts before and after machining in batches; a positioning sleeve is installed in the support and used for installing bolts in batches for machining. And the positioning shaft is located at the axis of the adjacent supports, and a top plate is installed above the positioning shaft through an electric expansion piece and used for controlling the bolt installation height. The bolt chamfering device can be used for continuously chamfering bolts in batches, the effects of angle inclination, direction adjustment and machining surface replacement are realized during batch machining, the operation is simple, and the overall machining time consumption is shortened at the same time.

The utility model belongs to the technical field of sports shoes net surface replacement, and disclose a kind of replaceable net surface sports shoes, recess is set in the inside of the front end surface of the sports shoes body, the inside of the recess is attached and is equipped with net surface, the left and right sides of the net surface are fixedly provided with fixed block, the lower end surface of the fixed block is fixedly provided with magic tape one, the left and right sides of the recess are equipped with vertical groove in the middle, the inside upper side of the vertical groove is fixedly provided with magic tape two, and magic tape one and magic tape two are mutually pasted and fixed, the inside middle of the vertical groove is equipped with magnetic attraction groove, by magic tape, fixed block and magnetic attraction column, magnetic attraction groove, using them can realize the quick connection and separation of net surface, it is convenient according to different scene, requirement or preference, quickly replace the net surface of sports shoes, and they have better durability, wear resistance, not easy to be deformed or broken, can withstand multiple use and repeatedly open and close, extend the overall service life of shoes.

The invention discloses a TPMS-based bone scaffold topological structure for treating femoral head necrosis and an implantation method thereof, and relates to the field of bone scaffold topological structures. The stent comprises a stent main body structure, and the stent main body structure sequentially comprises a first stent cortical bone area, a stent cancellous bone area, a second stent cortical bone area and a stent'double cortical bone fixation 'femoral shaft penetrating area from top to bottom. The first stent cortical bone area, the stent cancellous bone area and the second stent cortical bone area are all subjected to structural topological optimization by utilizing TPMS. The invention provides a novel implantation mode by combining a three-period minimal curved surface (TPMS) topology optimization bone scaffold structure and fusing surface replacement and medullary core decompression, and solves the problems of insufficient mechanical support, poor structure biomimetic property, low implantation stability and the like of the existing bone scaffold. More accurate mechanical adaptation, better osseointegration effect and longer implant service life are achieved, so that caput femoris collapse is effectively delayed or avoided, and the requirement for artificial joint replacement is reduced.

The invention discloses a surgical tool for hip joint surface replacement, and relates to the technical field of surgical instruments, the surgical tool comprises a 3D-printed Scrib needle guider based on a preoperative CT model, a Scrib needle, a sleeve milling cutter, a first running stop ring, a second running stop ring, a plane milling cutter, a connecting piece and a bone drill, the Scrib needle guider is printed according to the specificity of a patient, the center of the femoral head can be accurately positioned, the first running stop ring is used for limiting the milling depth of the sleeve milling cutter, the second running stop ring is used for limiting the cutting depth of the plane milling cutter, and the bone drill is provided with the third running stop ring and scales, so that the drilling depth can be accurately controlled; according to the femoral head surface replacement device and method, accurate and safe operation of femoral head surface replacement is achieved, the bone mass of a patient is reserved, the prosthesis adaptation degree and fixing stability are improved, and reliable tool support is provided for the whole process of an operation.

This invention provides a femoral head surface replacement prosthesis assembly. The assembly includes an articular portion comprising a spherical body and a base. The base includes sidewalls and a bottom wall. The bottom of the spherical body is connected to the sidewalls of the base. The spherical body and the base together form an inner cavity of the articular portion. At least two first through holes communicating with the inner cavity are provided on the sidewalls of the base. This invention's femoral head surface replacement prosthesis assembly solves the problem of existing femoral head surface replacement prostheses being too heavy, causing patients to experience a significant foreign body sensation post-surgery and resulting in poor patient comfort.

The utility model discloses an interphalangeal joint surface replacement prosthesis which comprises a near-end phalanx surface prosthesis, and a near-end phalanx fixing part is arranged on the side portion of the near-end phalanx surface prosthesis and used for being fixed to the radial back side bone surface or the ulnar back side bone surface of the near-end phalanx metaphysis. A far-end phalanx fixing part is arranged on the side part of the far-end phalanx surface prosthesis and is used for being fixed on the median bone surface of the back side of the far-end phalanx metaphysis; the far-end end face of the near-end phalanx surface prosthesis and the near-end end face of the far-end phalanx surface prosthesis are each provided with a curved surface part, so that the far-end phalanx surface prosthesis can rotate relative to the near-end phalanx surface prosthesis, and the prosthesis and the side portion of the phalanx are connected and fixed through the near-end phalanx fixing part and the far-end phalanx fixing part. The mode of fixing through the intramedullary cavity is avoided, fixing can be conducted without bone cement, and serious complications such as deep medullary cavity infection are avoided.