Acetabular cup for artificial hip joint

Abstract

The invention provides an acetabular cup for an artificial hip joint and relates to the field of artificial joints. The acetabular cup comprises a cup body and multiple fixing tooth rings layered on the surface of the cup body, wherein the cup body is provided with a cup top hole at the top of the cup body and a cup opening at the bottom of the cup body; an accommodating cavity is formed in the cup body; the cup top hole and the cup opening are both communicated with the accommodating cavity; each layer of fixing tooth ring comprises multiple fixing teeth surrounding the center line of the cup body and positioned on the same horizontal plane; and each fixing tooth is arranged on the surface of the cup body. Compared with the prior art, in the acetabular cup for an artificial hip joint provided by the invention, the fixing teeth are arranged on the surface of the cup body, and the dimension and angle of the fixing teeth on the surface of the cup body are gradually increased; and therefore, the acetabular cup is always kept in press fit with the acetabular fossa, and good initial fixation and long-term fixation of the acetabular cup in the acetabular fossa are realized.

Description

[0001] technical field [0002] The invention relates to the field of artificial joints, in particular to an acetabular cup for artificial hip joints. Background technique [0003] Artificial hip joint products are generally composed of four parts: femoral stem, usually made of metal; femoral head, usually made of metal or ceramic material; acetabular lining, usually made of ultra-high molecular weight polyethylene or ceramic material; acetabular cup, usually For metal materials. [0004] In the design of the acetabular cup, which is usually hemispherical, the surface can be roughened or microporous. In actual surgical use, the acetabular reamer is usually used to grind a semicircular acetabular socket, and then implanted into a larger acetabular cup. The purpose of this is to create a press fit between the acetabular cup and the acetabulum itself (the press fit in this example is 1mm on each side) so as to achieve better initial fixation. The microporous coating on th...

AI Technical Summary

Problems solved by technology

The disadvantages of this are: first, it is not reliable to rely solely on the press-fit of the acetabular bone and the acetabular cup itself to achieve initial fixation, especially in patients with poor bone quality; second, the press-fit depends on the acetabular The radius of the cup is 1mm larger than the radius of the acetabular socket, so when the acetabular cup reaches the bottom of the acetabular socket, the edge of the acetabular cup does not reach the 1mm press fit, which affects the initial fixation; third, loose The bone ingrowth of the bone is related to its force (Woolf's theorem). In the use of hemispherical acetabular cup, the force of the acetabulum will be concentrated at the bottom, and the force around the acetabulum is not concentrated, so The human acetabulum does not play the role of hooping the acetabular cup, which affects the fixation effect

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