Metal hip joint prosthesis with porous layer structure and preparation method thereof

Abstract

The invention provides a metal hip joint prosthesis with a porous layer structure. The metal hip joint prosthesis comprises an acetabulum outer cup, an acetabulum lining, a femoral ball head and a hipjoint femoral stem, wherein the hip joint femoral stem comprises a femoral stem neck part, a femoral stem near end and a femoral stem far end; the upper end of the hip joint femoral stem neck part issleeved by the femoral ball head in cooperation with the acetabulum lining for use; the acetabulum outer cup sleeves outside the acetabulum lining; the contact surfaces of the metal hip joint prosthesis and host bone tissue are of porous structures similar to human bone trabecula in three-dimensional communication; the metal hip joint prosthesis specifically comprises the hip joint femoral stem with a pore layer and the porous acetabulum outer cup; the femoral stem far end is of a whole or surface porous structure; and the pore diameter of the pore layer of the femoral stem far end is smallerthan the pore diameter of the pore layer of the femoral stem near end. The invention also discloses a method for preparing the hip joint femoral stem and the acetabulum outer cup by integrated molding with a 3D printing technology. The metal hip joint prosthesis with the porous layer structure provided by the invention facilitates ingrowth of new bone tissues, and reduces the risk that a pore layer prepared through a surface treatment method is prone to falling off.

Description

technical field [0001] The invention relates to the technical field of artificial hip joint prosthesis preparation, in particular to a metal hip joint prosthesis with a porous layer structure and a preparation method thereof. Background technique [0002] Femoral head necrosis, also known as avascular necrosis of the femoral head, refers to the damage or interruption of the blood supply of the femoral head, resulting in the death of the active components of the bone in the variable area of ​​the femoral head, resulting in changes in the structure of the femoral head, collapse, and narrowing of the joint space. Osteoarthritis is one of the more common chronic diseases in orthopedics. Artificial joint replacement is still the best choice for advanced femoral head necrosis, and the majority of femoral head necrosis will inevitably undergo artificial joint replacement. However, there are still some patients who have complications such as prosthesis loosening, dislocation, infec...

AI Technical Summary

Problems solved by technology

For example, sintering titanium wire on the surface of the prosthesis, plasma spraying titanium alloy powder, hydroxyapatite coating, etc., but the bonding force between the coating and the substrate is relatively insufficient, and the coating is easy to fall off, and the coating is easy to wear and generate debris , leading to aseptic loosening and immune rejection

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