CN2173045Y

CN2173045Y - Cement artificial joint

Info

Publication number: CN2173045Y
Application number: CN 93247275
Authority: CN
Inventors: 马忠泰
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-12-13
Filing date: 1993-12-13
Publication date: 1994-08-03
Anticipated expiration: 2003-12-13

Abstract

The utility model discloses an artificial joint used for replacing a damaged joint in the human body in medical treatment. The artificial joint is in a titanium wire mesh micro-pore structure and is in a hydroxy apatite type, namely, irregular micro-pore structures which are formed by a layer of titanium wire mesh or the small bead and are communicated with each other are covered on the surface of an ordinary artificial joint, and then, a layer of hydroxy apatite is additionally covered on the foundation. Thus, the original bone can grow into the micro-pore structures of the artificial joint to integrate the original bone and the artificial joint.

Description

Cement artificial joint

This utility model relates to the pseudocolloid of using in a kind of medical treatment, in particular for substituting the artificial joint in the joint of having damaged in the human body.

Artificial joint is applied to the history of the existing many decades of human body, the development that obtained advancing by leaps and bounds at nearly more than 30 years, the annual in the world patient that artificial joint is installed reach hundreds thousand of more than, and increase progressively with year, the artificial joint of using divides two major types now: a class is the bone cement artificial joint, and another kind of is the none-cement artificial joint.First type artificial joint, its disadvantage are exactly loosening, and incidence rate is very high.Abroad in primary study none-cement artificial joint in recent ten years, existing two kinds at present, a kind of is the pore type artificial joint, it is with the extrusion of titanium wire network or beads, the sintering surface at artificial joint, make it microcellular structure irregular in the formation of artificial joint surface, that communicate with each other, the experiment proved that Titanium and bone have affinity, and have only micropore, bone just can be grown in it.Another kind is a hydroxyapatite type, and it is at common artificial articular surface sintering or spraying last layer hydroxyapatite.Hydroxyapatite has the guiding bone formation performance, promotes surrounding bone to the artificial joint superficial growth.This artificial joint of two types is all than bone cement artificial joint advanced person, reasonable, each the personal kit of these two kinds of artificial joint profiles, and after the installation, artificial joint contacts with bone and fits together perfectly, and has permanent ability.These two kinds of artificial jointes all rely on osteogenesis and fix in addition, and final and year integral body of bone formation, this is to fix biology of human body self, so be nonvolatil, they can use in human body 30 years, its wearing and tearing are small, if do not become flexible, an artificial joint is installed is hopeful and can uses for lifelong.

But these two kinds of none-cement artificial jointes rely on osteogenesis and fix, and its bed knife is not all very abundant, and the still generation that has is loosening, and what have has left over fine motion, produces corresponding symptom clinically, and loosening rate is about 10-20%.Zoopery also shows, not being all has new bone to grow in the whole micropore, and the micropore that has new bone to grow into only accounts for the 30-70% of whole micropores.If the lip-deep hydroxyapatite thickness of hydroxyapatite artificial joint, finally is directed at and causes the loosening of artificial joint if slowly absorb easily after the too thin several years then several months too thick cracked easily.Therefore, these two kinds of none-cement artificial jointes still have loosening and fixing unstable shortcoming.

This utility model purpose be to design and manufacture a kind of performance better, can rely on the human body self skeletonization and be securely fixed in the artificial joint that carries on the bone, its firm degree is carried on the bone as artificial joint is planted and is grown in, artificial joint replacement is no longer included loosening trouble and worry takes place, improve curative effect, to replace existing artificial joint.

The artificial joint that this utility model is made up of artificial joint handle ［ 4 ］, mortar medicated cap ［ 5 ］, ball ［ 3 ］, metal cup ［ 2 ］, its feature is to be added with irregular, the microcellular structure layer ［ 8 ］ that communicates with each other that one deck is formed by titanium wire network or beads at the wide head part ［ 6 ］ of artificial joint handle and end portion ［ 7 ］, and covers one deck hydroxyapatite layer ［ 9 ］ on this microcellular structure layer again.During use, the metal cup of artificial hip joint ［ 2 ］ is fixed on the hipbone with screw ［ 1 ］, after inserting artificial hip joint handle ［ 4 ］ in the femoral cavity, make a concerted effort because Titanium silk screen and bone have, and micropore is arranged, and hydroxyapatite has the guiding bone formation performance, can promote surrounding bone to the artificial joint superficial growth, therefore, along with green bone is grown in the micropore gradually, green bone and artificial joint will form an integral body.

Owing to take technique scheme, it is more, faster, easier in the micropore to make that the guidance quality of this its skeletonization of artificial joint can make bone grow into; The surface area of hydroxyapatite increases 5 times than the surface area of planar hydroxyapatite type artificial joint on the new artificial joint, and the ability of the skeletonization that therefore leads also increases by 500; In addition, because hydroxyapatite biologically active, can produce the guiding skeletonization, bone trabecula can be grown in the more micropore, even hydroxyapatite is cracked or be absorbed in the micropore, grown into and stopped up micropore because of bone trabecula, good fixation reaches, thereby it is loosening can not produce artificial joint; Have, set up the microcellular structure of a spraying hydroxyapatite in the termination of artificial joint handle, increased a skeletonization, the fixing position of artificial joint, it is more fixing that the artificial joint handle is obtained.

Fig. 1 is the assembly structure sketch map of the artificial hip joint of a kind of embodiment of the present invention.

As shown in Figure 1, artificial hip joint of the present invention is by artificial hip joint handle ［ 4 ］, Acetabulum cap ［ 5 ］, ball ［ 3 ］, metal cup ［ 2 ］, screw ［ 1 ］ is formed, artificial hip joint handle ［ 4 ］ is made of metal, wide head part ［ 6 ］ and end portion ［ 7 ］ at it are gone up irregular, the microcellular structure layer ［ 8 ］ that communicates with each other that covers last layer titanium wire network or beads formation with extrusion or agglomerating method, and then on the basis, spraying or sintering last layer thickness are the hydroxyapatite layer ［ 9 ］ about 50 μ m.

During clinical making, metal cup ［ 2 ］ the usefulness screw ［ 1 ］ of artificial hip joint is fixing, and on hipbone, artificial hip joint handle ［ 4 ］ inserts in the femoral cavity, has titanium wire network micropore hydroxyapatite partly can grow as a whole with green bone.

Claims

1, a kind of replacement bone that is used for is closed the artificial joint of saving, it comprises artificial joint handle [4], mortar medicated cap [5], ball [3], metal cup [2], screw [1], it is characterized in that on the wide head part [6] of artificial joint handle [4] and end portion [7], having the microcellular structure layer [8] that one deck titanium wire network or beads form is irregular, those shapes communicate, also be coated with one deck hydroxyapatite layer [9] above the layer at this.