Rotary flat bench-type knee-joint prosthesisTechnical field
This utility model relates to a kind of knee-joint prosthesis, particularly a kind of rotary flat bench-type knee-joint prosthesis.
Background technology
In the situation of replacement knee in arthroplasty, tibia support is presented in patient's tibia, then tibia pad prosthese is fixed on tibia support, and the femoral joint face of patient's femur is resisted against on tibia pad prosthese.This replacement knee in arthroplasty becomes conventional clinically operation, and is obtaining significant success aspect treatment knee joint disease.
One class knee-joint prosthesis is rotary flat bench-type knee-joint prosthesis, and the tibia pad prosthese of the knee-joint prosthesis of the type, with respect to the rotation of tibia support prosthese, can be realized larger freedom of motion.Existing knee-joint prosthesis mainly comprises lateral femoral condyle prosthesis, tibia support prosthese and tibia pad prosthese; For realizing combining closely of tibia support and tibia pad prosthese, reduce the distortion of tibia pad prosthese, improve physical life.
But the following technical problem of existing rotary flat bench-type knee-joint prosthesis ubiquity:
1. lateral femoral condyle prosthesis and tibia pad prosthese compatible degree are low, large to the wearing and tearing of tibia pad prosthese; 2. because causing wear particle to enter bone-prosthese interface, the open design of groove between condyle cause bone to dissolve; 3. the asymmetric stress of tibia support, the even destruction of prosthese of becoming flexible, wear and tear that more easily produces prosthese and osseous tissue interface.
Utility model content
In order to solve the problems of the technologies described above, this utility model provides a kind of rotary flat bench-type knee-joint prosthesis, and this knee-joint prosthesis meets people's daily behavior kinetic characteristic; And described knee-joint prosthesis interface stability, be beneficial to and osseous tissue ankylose, solve the instability problems such as knee-joint prosthesis interface is loosening, excessive wear, long service life.
The concrete technical scheme of this utility model is as follows: a kind of rotary flat bench-type knee-joint prosthesis, comprises lateral femoral condyle prosthesis, tibia support prosthese and tibia pad prosthese.
Wherein, lateral femoral condyle prosthesis comprises platform between the condyle that is two protruding grand condyles of sphere and limit in the middle of front at described condyle.
Described condyle comprises with tibia pad prosthese matches femoral joint face, be combined composition surface in the condyle of fixation with sclerotin; In condyle, between composition surface and condyle, between platform, be connected by groove composition surface between the condyle of these platform both sides, be formed on the intercondylar fossa structure caving in horizontal frontal plane; In condyle, in the middle of composition surface, outer side edges is provided with the draw-in groove of being convenient to condyle of femur implantation or taking out.
The knee-joint anatomy structure of this femoral joint surface construction and human body matches; Whole lateral femoral condyle prosthesis is without the integrated structure interrupting.
Tibia support prosthese comprise tibial tray, for insert handle in the tibia marrow of proximal tibia pulp cavity and vertical with tibial tray and with tibia marrow in the crossing reinforcement of handle.
Tibial tray comprises the flat surface of upper surface and the tibia composition surface of lower surface; In the middle of flat surface, be also provided with and extend through the interior handle of tibia marrow and be conical slotted eye, making handle in tibia marrow is hollow structure.
The Tibial osteotomy end face of this tibia composition surface and human body matches; Whole tibia support prosthese is without the integrated structure interrupting.
Tibia pad prosthese comprises the tibial prosthesis face matching with femoral joint face in top, for realizing knee-joint prosthesis kinematic pair; Spacing column in the middle intercondylar fossa that is used for inserting groove composition surface between condyle in top, the shape of spacing column and intercondylar fossa structure fit, make femoral joint face at the stable scroll forward and backward of tibial prosthesis face energy; Tibial prosthesis face is without being connected of interrupting with the outline of spacing column; The bottom of tibia pad prosthese is also provided with the Rotary cloumn of the cone shape matching with slotted eye, and is rotatable cooperation between the two.
Further, knee-joint prosthesis also comprises is located at the patella of holding in face of femoral joint, and the facies articularis patellae of patella is provided with protruding vertical columns, and patella centre reduces gradually to the thickness of edge.
In order to improve the matching degree on composition surface in condyle, the end face that composition surface has after nine connected faces and patient's femur osteotomy in described condyle engages.
For sufficient stability is provided to prosthese, tibial prosthesis face comprises the glenoid surface of both sides and connects two joint faces at glenoid surface two ends, two joint faces connect spacing column in caving in also forward and backward respectively, connect the integral structure of spacing column-type in glenoid surface.Glenoid surface is oval shape, and this avette contact surface matches with described femoral joint face; This avette contact surface is the structure towards balance of nature point.
In order to bear better compressive stress and the shearing force of caused by relative motion of femoral prosthesis and tibial prosthesis, reinforcement is two, forms the angle of 140 ° between the plane of described two reinforcements.
Further, in order to improve lateral femoral condyle prosthesis combination interface stability, it is prominent that the interior composition surface of condyle is provided with latticed ridge.
Further, in condyle, composition surface is distributed with multiple kicks.
In order further to improve stability, in condyle, median surface 1/2 position on composition surface is provided with the implant post of a pair of symmetry, and the position near reinforcement on described tibia composition surface is provided with a pair of implant post.This implant post is hollow posts structure, implants post jamb and is provided with multiple through holes, and the insertion end of described implant post is provided with tapered hole.
Again further, in order to improve biocompatibility and the matching degree of knee-joint prosthesis and human body, in condyle, between composition surface and condyle, groove composition surface has the titanium coating for inducing bone cell growth; In tibia composition surface and tibia marrow, handle has the titanium coating for inducing bone cell growth.
Femoral joint face, flat surface be for reduce and tibia pad prosthese between the high burnishing surface of coefficient of friction.
Further, the polythene material that tibia pad prosthese is super high molecular weight.
Rotary flat bench-type knee-joint prosthesis provided by the utility model, at least following advantage:
1, there is good initial stability and life-time service stability; The avette contact surface of glenoid surface, towards the guide structure of balance of nature point, provides free kinesiology and sufficient stability; Ridge in condyle on composition surface is dashed forward and kick design, improves interface stability, makes it in conjunction with tight; In tibia faying face and tibia marrow, in handle, scribble titanium coating, improved the biocompatibility of knee-joint prosthesis and sclerotin.
2, the caused by relative motion compressive stress and the shearing force that become the reinforcement of 140 ° of angle settings can bear better femoral prosthesis and the tibial prosthesis of human body, improve interface stability, makes tibia support and tibia pad prosthese be difficult for loosening, disengaging, improves steadiness.
3, in order to reduce the friction of lateral femoral condyle prosthesis and tibia pad prosthese prosthese, condyle of femur and tibia pad prosthese height shape are closed, and the high polishing design in the surface of femoral joint face and tibial prosthesis face, reduce the suffered bad stress of prosthese.
4, the porous implant post arranging on composition surface in condyle has played good effect of merging mutually with sclerotin, has improved anti-penetration resistance, further improves kneed service life.
Brief description of the drawings
Fig. 1 is the overall structure explosive view of the specific embodiment 1 of this utility model rotary flat bench-type knee-joint prosthesis;
Fig. 2 is the overall structure explosive view of the specific embodiment 1 of this utility model rotary flat bench-type knee-joint prosthesis;
Fig. 3 is the overall structure schematic diagram of the specific embodiment 1 of this utility model rotary flat bench-type knee-joint prosthesis;
Fig. 4 is the structural representation of the tibia pad prosthese of the specific embodiment 1 of this utility model rotary flat bench-type knee-joint prosthesis;
Fig. 5 is the structural representation of the tibia pad prosthese of the specific embodiment 1 of this utility model rotary flat bench-type knee-joint prosthesis;
Fig. 6 is the structural representation of the lateral femoral condyle prosthesis of the specific embodiment 1 of this utility model rotary flat bench-type knee-joint prosthesis;
Fig. 7 is the tibia support structural representation of the specific embodiment 2 of this utility model rotary flat bench-type knee-joint prosthesis;
Fig. 8 is the structural representation of the lateral femoral condyle prosthesis of the specific embodiment 3 of this utility model rotary flat bench-type knee-joint prosthesis;
Fig. 9 is the structural representation of the lateral femoral condyle prosthesis of the specific embodiment 4 of this utility model rotary flat bench-type knee-joint prosthesis;
Figure 10 is the structural representation of the lateral femoral condyle prosthesis of the specific embodiment 5 of this utility model rotary flat bench-type knee-joint prosthesis;
Figure 11 is the structural representation of the tibia support of the specific embodiment 5 of this utility model rotary flat bench-type knee-joint prosthesis.
The corresponding name of number in the figure is called: 10-lateral femoral condyle prosthesis, 11-condyle, platform between 12-condyle, 13-draw-in groove, 14-implant post, 110-femoral joint face, composition surface in 111-condyle, groove composition surface between 112-condyle, 113-ridge is prominent, 114-kick, 141-tapered hole, 142-through hole;
20-tibia support prosthese, 21-tibial tray, handle in 23-tibia marrow, 24-reinforcement, 25-slotted eye, 211-flat surface, 212-tibia composition surface;
30-tibia pad prosthese, the spacing column of 32-, 33-Rotary cloumn, 311-tibial prosthesis face, 312-glenoid surface, 313,314-joint face;
40-patella, 41-vertical columns.
Detailed description of the invention
Specific embodiment 1
This utility model provides a kind of rotary flat bench-type knee-joint prosthesis, shown in Fig. 1～Fig. 6, comprises lateral femoral condyle prosthesis 10, tibia support prosthese 20 and tibia pad prosthese 30.
Wherein, lateral femoral condyle prosthesis 10 comprises platform 12 between the condyle that is two protruding grand condyles 11 of sphere and limit in the middle of front at condyle 11.
Described condyle 11 comprises the femoral joint face 110 matching with joint spacer 30, be combined composition surface 111 in the condyle of fixation with sclerotin, in condyle, between composition surface 111 and condyle, between platform 12, be connected by groove composition surface 112 between the condyle of these platform both sides, be formed between the nest caving in horizontal frontal plane and construct; The end face that composition surface 111 has after nine connected faces and patient's femur osteotomy in condyle combines, as shown in Figure 2 and Figure 6.
In condyle, in the middle of composition surface 111, outer side edges is provided with draw-in groove 13, and this draw-in groove 13 is convenient to condyle of femur implantation or is taken out.Femoral joint face 110 structures match with the knee-joint anatomy structure of human body; Whole lateral femoral condyle prosthesis 10 is without the integrated structure interrupting.
Tibia support prosthese 20 comprise tibial tray 21, for insert handle 23 in the tibia marrow of proximal tibia pulp cavity and vertical with tibial tray 21 and with tibia marrow in the crossing reinforcement 24 of handle 23.
Tibial tray 21 comprises the flat surface 211 of upper surface and the tibia composition surface 212 of lower surface; In the middle of flat surface 211, be also provided with and extend through the interior handle 23 of tibia marrow and be conical slotted eye 25, making handle 23 in tibia marrow is hollow structure.Tibia composition surface 212 matches with the Tibial osteotomy end face of human body; Whole tibia support prosthese 20 is without the integrated structure interrupting.
Shown in Fig. 4, Fig. 5, tibia pad prosthese 30 comprises the tibial prosthesis face 311 matching with femoral joint face 110 in top, for realizing motion of knee joint pair; In the middle of top, be used for the spacing column 32 of the intercondylar fossa of inserting groove composition surface 112 between condyle, the shape of this spacing column 32 and intercondylar fossa structure fit, and the scroll forward and backward that femoral joint face 110 can be stable at tibial prosthesis face 311; Tibial prosthesis face 311 is without being connected of interrupting with the outline of spacing column 32; The bottom of tibia pad prosthese 30 is also provided with the Rotary cloumn 33 of the cone shape matching with slotted eye 25, and is rotatable cooperation between the two.
After this prosthese implant into body, under the restriction of soft tissue structure, can realize to the rotation of the 10 ° of scopes in both sides around; Compare fixed knee-joint prosthesis, there is good activeness.
Knee joint also comprises the patella 40 of being located at femoral joint face 110 front ends, and the facies articularis patellae of patella 40 is provided with protruding vertical columns 41.The centre of patella 40 is to edge, and thickness reduces gradually.This patella 40 matches with the patella anatomic construction of human body.
Shown in Fig. 5, tibial prosthesis face 311 comprises the glenoid surface 312 of both sides and connects two joint faces 313,314 at glenoid surface 312 two ends, two joint faces 313,314 connect spacing column 32 in caving in also forward and backward respectively, in glenoid surface 312, connect spacing column 32, spacing column 32 is wrapped to form integrative-structure by these four faces.Glenoid surface 312 is avette, and this avette contact surface matches with femoral joint face 110; This avette contact surface is the structure towards balance of nature point.
In condyle, between composition surface 111 and condyle, groove composition surface 112 has the titanium coating for inducing bone cell growth; In tibia composition surface 212 and tibia marrow, handle 23 has the titanium coating for inducing bone cell growth; Femoral joint face 110, flat surface 211 for for reduce and tibia pad prosthese 20 between the high burnishing surface of coefficient of friction.
The polythene material that tibia pad prosthese 30 is super high molecular weight.
Specific embodiment 2
The rotary flat bench-type knee-joint prosthesis of the present embodiment, except reinforcement 24 is different from embodiment 1, other structures are all identical.As shown in Figure 7, the quantity of reinforcement 24 is two, forms the angle of 140 ° between the plane of these two reinforcements 24.
Specific embodiment 3
The rotary flat bench-type knee-joint prosthesis of the present embodiment is except composition surface 111 in condyle is different from embodiment 1, and other structures are all identical.As shown in Figure 8, in described condyle, nine faces on composition surface 111 are provided with latticed ridge and dash forward 113, and latticed ridge prominent 113 is combined tightr with bone marrow, can improve condyle combination interface stability.
Specific embodiment 4
The rotary flat bench-type knee-joint prosthesis of the present embodiment is except composition surface 111 in condyle is different from embodiment 1, and other structures are all identical.As shown in Figure 9, on nine faces on the interior composition surface 111 of described condyle, be distributed with multiple kicks 114.
Specific embodiment 5
Rotary flat bench-type knee-joint prosthesis of the present utility model is compared with embodiment 1 structure, and except having increased the feature of implant post 14, other structures are all identical.As shown in Figure 10-11, in condyle, median surface 1/2 position on composition surface 111 is provided with the implant post 14 of a pair of symmetry, and the position near reinforcement 24 on tibia composition surface 212 is provided with a pair of implant post 14; This implant post 14 is hollow posts structure, and this hollow post jamb is provided with multiple through holes 142, and the insertion end face of implant post 14 is provided with tapered hole 141.
The above embodiment is only that preferred implementation of the present utility model is described; not scope of the present utility model is limited; do not departing under the prerequisite of this utility model design spirit; various distortion and improvement that those of ordinary skill in the art make the technical solution of the utility model, all should fall in the definite protection domain of claims of the present utility model.