Metal acetabulum outer cup of artificial hip joint of a kind of band thin porous layer of improvement and preparation method thereofTechnical field
The present invention relates to the artificial joint of medical science osteoarticular field, the metal acetabulum outer cup of artificial hip joint of particularly a kind of improvement.
Background technology
Metal acetabulum outer cup of artificial hip joint is body implant.The alternative of implant into body hip joint when needing to carry out orthopaedics replacement operation for human hip pathological changes, makes patient recover the physiological function of hip joint to a certain extent, alleviating pain after implantation, improve motion and improve the quality of living.
In prior art, make metal acetabulum outer cup of artificial hip joint by casting or forging, after form thin porous layer through sandblasting at cup (1), or hydroxyapatite or titanium are formed thin porous layer by thermal spraying at cup (1); Also metal acetabulum outer cup of artificial hip joint and porous surface thin layer is made into integration by increasing material manufacture.But by casting and forge the metal acetabulum outer cup of artificial hip joint of formation, the porosity on its surface is difficult to customization, is unfavorable for that bone depends on or Bone Ingrowth, after using certain hour, has loosening possibility, adds the mortality of replacement, the physiological load of making patients.The metal acetabulum outer cup of artificial hip joint be made into integration by the manufacture of increasing material is inadequate because of manufacturing technology Maturity, can not ensure mechanical property and the mechanical strength of acetabular outer cup, cause there is distortion in implant, loosens the risk with second operation.
Summary of the invention
The object of the present invention is to provide a kind of metal acetabulum outer cup of artificial hip joint of improvement, under the prerequisite ensureing mechanical property and mechanical strength, the porosity with Bone Ingrowth can be depended on for the most applicable bone of acetabular outer cup customization, overcome after existing metal acetabulum outer cup of artificial hip joint is implanted and easily loosen, yielding defect.
Task of the present invention realizes by this way:
A kind of metal acetabulum outer cup of artificial hip joint, first makes by casting or forging, then is manufactured on cup outer surface by increasing material and forms porous medical metal thin layer (2), and customizes optimum porosity for this thin porous layer.
Can according to the sclerotin difference of patient and biomechanics requirement, for patient customizes coverage rate and the porosity of thin porous layer.
Thin porous layer (2) is distributed in the respective surfaces that cup (1) contacts with patient's sclerotin, can cover the surface of 1% ~ 99%;
The mean porosities scope of thin porous layer (2) is 1% ~ 99%.
Advantage of the present invention is:
The present invention makes metal acetabulum outer cup of artificial hip joint by casting or forging, and ensure that intensity and the mechanical property of acetabular outer cup.Be manufactured on cup outer surface formation thin porous layer by increasing material again, and customize optimum porosity for thin porous layer (2), bone can be conducive to substantially and depend on and Bone Ingrowth.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention structural representation (wherein thin porous layer is distributed in the part surface of cup outer surface).
Detailed description of the invention
As shown in Figure 1, the invention provides a kind of metal acetabulum outer cup of artificial hip joint, make by casting or forging.Then set up the model with the thin porous layer of optimum porosity (such as 40%) in a computer, then by laser or high-power electron beam melting medical metal powder, this metal acetabulum outer cup of artificial hip joint outer surface obtains required thin porous layer.