A kind of locking mechanism for tibial plateauTechnical field
The present invention relates to artificial joint field, a kind of locking mechanism for tibial plateau.
Background technology
TKA is a kind of prosthetic replacement's surgical operation, refers to that excising body cannot repair voluntarilyMultiple articular surface, substitutes the joint damaged, orthotic limbs muscle power line, eliminates the gonalgia, maintain joint with artificial joint componentStability, recovers a kind of Therapeutic Method of knee joint function.
Fixed platform knee joint is made up of 2 parts in tibial side: one is tibia support, and two is tibial insert, tibia support withTibial plateau has a locking mechanism.Current locking mechanism is usually: make a circle in platform week projection, central fluting；At tibiaOn pad, a circle projection of correspondence is had to clamp in groove.Mainly having the disadvantage that of this locking mechanism: 1, be squeezing into tibiaThe when of pad, relatively difficult；2, tibial insert is relatively big, because surrounding has circle becket and a pad with the contact surface of tibia supportBeing contact, after beginning to use after human body is implanted in joint, tibial insert and tibia support can produce fine motion, especially in inside/outside sideThis direction, polyethylene pad and metal tibial torr can produce shock, and the biggest contact area can produce abrasive dust (mainlyPolyethylene chip)；3, difficulty of processing strengthens, and owing to the material of tibia support is typically vitallium, in one plane processesGo out an annular structure and need more process time and the abrasion to cutter, so can increase cost；Meanwhile, tibia supportSurface is typically height polishing, and the structure of this plane and surrounding annular can increase the difficulty of polishing, increases cost.
Summary of the invention
For the problems referred to above, the invention provides a kind of locking mechanism for tibial plateau, it is ensured that tibia support supports seatLocking with tibial insert, do not produce displacement, difficulty of processing reduces simultaneously, and manufacturing cost reduces.
The technical solution used in the present invention is:
A kind of locking mechanism for tibial plateau, supports seat and tibial insert including tibia support, and it also includes buckle structure, shinBone torr supports seat and is provided with positioning convex, and tibial insert is provided with the detent matched with positioning convex, buckle structure bagInclude and be arranged on the buckle that tibia support supports seat upper latch notch and is arranged on tibial insert, coordinate with detent at positioning convexTime, buckle and bayonet fittings.
Preferably, positioning convex is T-shaped, and positioning convex includes lateral projection and longitudinally convex, and lateral projection is with the most convexRising vertical, lateral projection connects as one with longitudinally convex.
Preferably, detent is the T-shaped matched with positioning convex, and detent includes that transverse concave groove is with the most recessedGroove, transverse concave groove is vertical with longitudinal fluting, and transverse concave groove is connected with longitudinal fluting.
Preferably, bayonet socket includes first bayonet socket and two the second bayonet sockets, and tibia support supports seat and is additionally provided with a locationStake, guide pile is vertical with longitudinally convex, and the first bayonet socket is arranged on guide pile, and two the second bayonet sockets are separately positioned on and are in longitudinal directionOn the same sidewall of the lateral projection of protruding both sides.
Preferably, buckle includes first buckle and two the second buckles, and tibial insert is additionally provided with one and locationThe fixed groove that stake coordinates, the first buckle is arranged in the groove bottom of fixed groove, and two the second buckles are separately positioned on and are inOn the same sidewall of the transverse concave groove of longitudinal fluting both sides, the first buckle and the first bayonet fittings, the second buckle and the second bayonet socketCoordinate.
Compared with prior art, the beneficial effects of the present invention is: the present invention provides a kind of locking for tibial plateauMechanism, uses positioning convex to coordinate with detent, carries out triple locking with buckle and bayonet socket simultaneously, it is ensured that tibia support supports seatLocking with tibial insert, do not produce displacement, difficulty of processing reduces simultaneously, and manufacturing cost reduces.
Accompanying drawing explanation
The axonometric chart of a kind of locking mechanism for tibial plateau that Fig. 1 provides for the present invention；
A kind of schematic diagram of tibia support support seat in the locking mechanism of tibial plateau that Fig. 2 provides for the present invention；
A kind of another schematic diagram of tibia support support seat in the locking mechanism of tibial plateau that Fig. 3 provides for the present invention；
A kind of schematic diagram of tibial insert in the locking mechanism of tibial plateau that Fig. 4 provides for the present invention；
A kind of another schematic diagram of tibial insert in the locking mechanism of tibial plateau that Fig. 5 provides for the present invention.
Detailed description of the invention
The preferred implementation provided the present invention with reference to the accompanying drawings illustrates.
Fig. 1 to Fig. 5, for the preferred implementation of a kind of locking mechanism for tibial plateau that the present invention provides.This useLocking mechanism in tibial plateau includes that tibia support supports seat 10, tibial insert 20 and buckle structure 30, and tibia support supports seat 10Being provided with positioning convex 11, tibial insert 20 is provided with the detent 21 matched with positioning convex 11, and buckle structure 30 wrapsInclude and be arranged on the buckle 32 that tibia support supports seat 10 upper latch notch 31 and is arranged on tibial insert 20, in positioning convex 11 and locationWhen groove 21 coordinates, buckle 32 coordinates with bayonet socket 31, tibia support so supports seat 10 and locks with tibial insert 20, and tibia support props upDo not produce displacement between support seat 10 and tibial insert 20, thus without producing abrasive dust, human body is produced impact.
As shown in Figures 2 and 3, tibia support supports the one side of seat 10 and arranges positioning convex 11, and another side arranges tibiaTorr.Positioning convex 11 is T-shaped, and positioning convex 11 includes lateral projection 111 and longitudinally convex 112, and lateral projection 111 is with the most convexRising 112 vertical, lateral projection 111 connects as one with longitudinally convex 112, and tibia support is supported the one of seat 10 by longitudinally convex 112Side is divided into two the first symmetrical plane domains, and such difficulty of processing reduces, and tool wear reduces, and reduces manufacturing cost.
Bayonet socket 31 includes first bayonet socket 311 and two the second bayonet sockets 312, and tibia support support seat 10 is additionally provided with one to be determinedPosition stake 12, guide pile 12 is 112 vertical with longitudinally convex, and the first bayonet socket 311 is arranged on guide pile 12, two the second bayonet sockets 312It is separately positioned on the same sidewall of the lateral projection 111 being in longitudinally convex 112 both sides.
As a kind of preferred implementation, lateral projection 111 is arranged along a side of tibia pallet support seat 10, locationAnother relative side that stake 12 supports seat 10 along tibia support is arranged, and the area of the first plane domain increases, it is simple to processing.
As shown in Figure 4 and Figure 5, detent 21 is the T-shaped matched with positioning convex 11, and detent 21 includes laterallyGroove 211 and longitudinal fluting 212, transverse concave groove 211 is vertical with longitudinal fluting 212, transverse concave groove 211 and longitudinal fluting 212 phaseConnection, when detent 21 coordinates with positioning convex 11, lateral projection 111 is in transverse concave groove 211, and longitudinally convex 112Being in longitudinal fluting 212, the side of tibial insert is divided into two the second symmetrical plane domains by longitudinal fluting 212, thisSample difficulty of processing reduces, and tool wear reduces, and reduces manufacturing cost.
Buckle 32 includes first buckle 321 and two the second buckles 322, tibial insert 20 is additionally provided with one with fixedThe fixed groove 22 that position stake 12 coordinates, the first buckle 321 is arranged in the groove bottom of fixed groove 22, two the second buckles 322It is separately positioned on the same sidewall of the transverse concave groove 211 being in longitudinal fluting 212 both sides, the first buckle 321 and the first bayonet socket311 coordinate, and the second buckle 322 coordinates with the second bayonet socket 312, so use the mode of buckle and the triple locking of bayonet fittings, willTibia support supports seat 10 and locks with tibial insert 20, prevents tibia support from supporting seat 10 and produces mobile with tibial insert 20.
As a kind of preferred implementation, transverse concave groove 211 is arranged along a side of tibial insert 20, fixed groove 22Another relative side along tibial insert 20 is arranged, and the area of the second plane domain increases, it is simple to processing.
In sum, technical scheme sufficiently effective can realize foregoing invention purpose, and the knot of the present inventionStructure and principle of work and power are the most sufficiently verified, can reach intended effect and purpose, without departing substantially from thisOn the premise of the principle of invention and essence, inventive embodiment can be made various changes or modifications.Therefore, the present invention includesAll be previously mentioned in patent claim in the range of all replacement contents, any made in scope of the present invention patentEquivalence change, all belong to this case application the scope of the claims within.