A kind of fixed platform knee-joint prosthesisTechnical field
The present invention relates to a kind of medical prosthesis, particularly relate to a kind of fixed platform knee-joint prosthesis.
Background technology
Knee-joint prosthesis is used to replace kneed surgical implant, for knee joint surface knee replacement surgery, the structure of existing knee-joint prosthesis structure mainly press-fit, is made up of condyle of femur, platform pad and platform holder, wherein, the material of condyle of femur, platform holder is vitallium, the material of platform pad is ultra-high molecular weight polyethylene, as shown in Figure 1, platform holder and platform pad sealed for being press-fitted, the front portion of platform pad is provided with translot, so that locked portions bounces back when platform holder and platform pad are installed.
Above-mentioned knee joint, though alternative knee joint femoral and tibia part articular surface, has progressive really, but but find when reality uses also to have some shortcomings in its structure, cause this knee joint in practical application, fail to reach best result of use, and its shortcoming can be summarized as follows:
1) wearing and tearing of platform pad column are heavier, go down on one's knees 10-45 ° time column contact with crossbeam rear wall, although stability is higher at the volley to make knee-joint prosthesis, but in daily walking process, just there is crossbeam contact phenomena, make polyethylene column comparatively quick-wearing, thus reduce prosthese service life, increase the probability that prosthese is overhauled;
2) in operation, platform pad and platform holder are that same model is used in combination, if but when there is the lateral femoral condyle prosthesis of patient and the inconsistent situation of tibial plateau prosthese model, due to for avoiding the wearing and tearing of side para-ligament to femoral prosthesis, when selecting model less, the tibial plateau that there will be respective model exceeds tibia cross section or is less than the phenomenon in tibia cross section, when tibial plateau is less than tibia cross section, the situation that may occur that Postoperative Bone is hemorrhage can be caused, and considerably increase the postoperative probability occurring prosthetic loosening due to tibial prosthesis cover part spongy bone.
In addition, still there are following problems in the prosthese of existing fixed platform design:
1) pad wearing and tearing are comparatively serious, turn up and inward turning there will be platform pad column and lateral femoral condyle prosthesis frequent impact due to fixed platform prosthese condyle of femur when moving, and cause platform pad column serious wear;
2) knee joint is when highly going down on one's knees, dislocation is turned over after condyle of femur is easy, although existing product adds a crossbeam (crossbeam is oval or cambered design) for preventing condyle of femur from dislocating between interior ectocondyle, but when highly going down on one's knees along with the change of crossbeam and platform pad column contact point, anti-dislocation effect is not so desirable;
3) platform pad and platform holder are non-anatomical form structural design, poor with patient's knee joint matching degree;
4) condyle of femur of present most knee-joint prosthesis product, platform pad and platform holder design for impersonal theory, in use often the condyle of femur of different size and the platform pad of same specification are used in combination, platform pad can be caused to turn up and the rotary middle point of inward turning changes at condyle of femur, cause the serious wear of platform pad.
Summary of the invention
The fixed platform knee-joint prosthesis the object of the present invention is to provide a kind of anti-dislocation, reducing wear.
For achieving the above object, the concrete technical scheme of a kind of fixed platform knee-joint prosthesis of the present invention is:
A kind of fixed platform knee-joint prosthesis, the platform pad comprising condyle of femur and platform holder and be arranged between condyle of femur and platform holder, it is characterized in that, platform pad is provided with protruding cylindrical column, condyle of femur is provided with groove, the column of platform pad is by being connected with condyle of femur through groove, and condyle of femur can rotate around the column of platform pad on platform pad, and to realize kneedly turning up, inward turning moves.
Further, the outer wall of condyle of femur is provided with protruding cushion block, cushion block is arranged near the end points of groove, when condyle of femur rotates around the column of platform pad, can be limited the upset of condyle of femur by the pad of projection, in case condyle of femur dislocation.
Further, condyle of femur and platform holder adopt the manufacture of vitallium material.
Further, platform pad adopts superhigh molecular weight polyethylene material manufacture.
The advantage of a kind of fixed platform knee-joint prosthesis of the present invention is:
1) make to measure according to the kneed various sizes of patient, there is good stability, high with patient's knee joint size matching degree;
2) platform pad column circular design, remains platform pad column to restriction during condyle of femur flexing, and contact too much when avoiding daily walking, decreases the wearing and tearing of platform pad column;
3) condyle of femur crossbeam T-shaped design, the anti-dislocation of condyle of femur is respond well;
4) condyle of femur, platform pad and platform holder adopt anatomical form personalized designs, both ensure that condyle of femur turned up and on platform pad, forms stable central point in inward turning process, and in turn ensure that knee-joint prosthesis and patient's knee joint high matching degree;
5) Using prosthesis implanted is stable, facilitating operation, reduces wearing and tearing to extend the prosthese life-span, thus is more suitable for practicality.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing knee-joint prosthesis;
Fig. 2 is the structural representation of condyle of femur of the present invention;
Fig. 3 is the upward view of the condyle of femur in Fig. 2;
Fig. 4 is the structural representation of platform pad of the present invention;
Fig. 5 is the structural representation of the platform holder in the present invention;
Fig. 6 is the top view of platform holder of the present invention;
Fig. 7 is the upward view of the platform holder in Fig. 6.
Detailed description of the invention
In order to better understand object of the present invention, structure and function, below in conjunction with accompanying drawing, further detailed description is done to a kind of fixed platform knee-joint prosthesis of the present invention.
As shown in Figures 2 to 7, it shows for a kind of fixed platform knee-joint prosthesis of the present invention, the platform pad 2 comprising condyle of femur 1 and platform holder 3 and be arranged between condyle of femur 1 and platform holder 3, the upper surface center of platform pad 2 is provided with protruding cylindrical column 21, the center of condyle of femur 1 is provided with groove 11, the column 21 of platform pad 2 is by being connected with condyle of femur 1 through groove 11, condyle of femur 1 can rotate by the column 21 around platform pad on platform pad, with column 21 for rotary middle point, realize that rotary middle point is constant completes kneed turning up, inward turning is moved, platform pad column is made to have the position limitation of rotation to condyle of femur when condyle of femur flexing, contact too much when avoiding daily walking, the wearing and tearing that can reduce platform pad are rotated around columniform column.Wherein, condyle of femur 1 and platform holder 3 adopt the manufacture of vitallium material, and platform pad 2 adopts superhigh molecular weight polyethylene material manufacture.
Further, the outer wall of condyle of femur 1 is provided with protruding cushion block 12, cushion block is arranged near the end points of groove 11, when condyle of femur 1 rotates around the column 21 of platform pad 2, the further upset of condyle of femur can be limited by the pad of projection, cause dislocation in case roll after condyle of femur when highly going down on one's knees to turn up.
Further, condyle of femur 1 in knee-joint prosthesis of the present invention, platform pad 2 and platform holder 3 are made to measure according to the various sizes in sufferer knee joint, produce the knee-joint prosthesis meeting sufferer size, the size of knee-joint prosthesis and the knee joint size of sufferer match, and have good stability.Wherein, the lower surface 13 of condyle of femur 1 matches with the upper surface 22 of platform pad 2, and to provide the high matching in stock-tibial prosthesis face, condyle of femur 1 can turn up and inward turning on platform pad 2, decreases the wearing and tearing of platform pad, is conducive to the service life extending platform pad.
Further, platform pad 2 and platform holder 3 adopt the structure of anatomical form, to make having higher matching degree with the knee joint of sufferer.
A kind of fixed platform knee-joint prosthesis of the present invention, makes to measure according to the kneed various sizes of patient, has good stability, high with patient's knee joint size matching degree; Platform pad column circular design, remains platform pad column to restriction during condyle of femur flexing, and contact too much when avoiding daily walking, decreases the wearing and tearing of platform pad column; Condyle of femur crossbeam T-shaped designs, and the anti-dislocation of condyle of femur is respond well; Condyle of femur, platform pad and platform holder adopt anatomical form personalized designs, both ensure that condyle of femur turned up and on platform pad, forms stable central point in inward turning process, and in turn ensure that knee-joint prosthesis and patient's knee joint high matching degree; The Using prosthesis implanted is stable, facilitating operation, reduces wearing and tearing to extend the prosthese life-span, thus is more suitable for practicality.
Further describe invention has been by specific embodiment above; but it should be understood that; here concrete description; should not be construed as the restriction to the spirit and scope of the invention; one of ordinary skilled in the art to the various amendments that above-described embodiment is made, belongs to the scope that the present invention protects after reading this specification.