CN117398221B

CN117398221B - Locking device for artificial knee joint

Info

Publication number: CN117398221B
Application number: CN202311717502.1A
Authority: CN
Inventors: 王彩梅
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2023-12-14
Filing date: 2023-12-14
Publication date: 2024-04-02
Anticipated expiration: 2043-12-14
Also published as: CN117398221A

Abstract

The invention provides a locking device of an artificial knee joint, comprising: a tibial plateau having a plateau surface; a tibial insert; the locking structure comprises a rear limiting piece, a front limiting piece, a guide piece and a locking tooth piece; the rear clamping block is in clamping fit with the rear bayonet, and the front clamping hook is in clamping fit with the front bayonet; the guide piece is including setting up at the protruding guide way in the middle part of the plane and setting up at the guide way in shank gasket middle part, and the direction that the direction is protruding along the rear side of shank platform to the front side extends, and locking tooth spare sets up the border department in the protruding at least one side of guide, and when back fixture block and back bayonet socket joint complex in-process, locking tooth spare and the lateral wall non-return cooperation of guide way, when back fixture block and back bayonet socket joint complex, locking tooth spare and the lateral wall locking cooperation of guide way. The technical scheme of the application effectively solves the problem that the tibial gasket is difficult to push in the process of the clamping and matching of the rear clamping block and the rear bayonet in the related technology, so that the tibial gasket is retracted by a certain distance.

Description

Locking device for artificial knee joint

Technical Field

The invention relates to a medical apparatus, in particular to a locking device of an artificial knee joint.

Background

The artificial joint replacement is suitable for patients with serious joint pain, instability and deformity, serious limitation of daily life and activity and ineffective or insignificant effect after conservative treatment. Artificial knee joints generally consist of a metal tibial plateau, a plastic tibial insert, and a metal femoral condyle. To improve the wear resistance of the artificial knee, the artificial knee component meniscus uses high molecular weight polyethylene as its material.

The locking structure between the metal tibia platform and the plastic tibia gasket ensures firm locking, reliable locking and easy operation. The locking structure comprises a rear limiting piece and a front limiting piece. The back locating part is including setting up the back spacing arch at the platform surface rear side, setting up the back bayonet socket on the spacing arch in back and setting up the back fixture block at shank gasket rear side, and preceding locating part is including setting up the preceding spacing arch of platform front side, setting up the preceding bayonet socket on preceding spacing arch and setting up the preceding pothook at shank gasket rear side, and wherein, back fixture block and back bayonet socket joint cooperation, preceding pothook and preceding bayonet socket joint cooperation. The front-back simultaneous locking mode needs to push the tibia gasket in, make the rear clamping block and the rear bayonet be in clamping fit, hammer the tibia gasket afterwards, and make the front clamping hook and the front bayonet be in clamping fit. Conventional pushing is difficult because of the stability of the lock, which results in the tibial insert backing a distance and being difficult to re-hammer the lock.

Disclosure of Invention

The invention mainly aims to provide a locking device for an artificial knee joint, which solves the problem that in the related art, a tibial gasket is difficult to push in the process of clamping and matching a rear clamping block and a rear bayonet, so that the tibial gasket can be retracted for a certain distance.

In order to achieve the above object, the present invention provides a locking device for an artificial knee joint, comprising: a tibial plateau having a plateau surface; a tibial insert; the locking structure comprises a rear limiting piece, a front limiting piece, a guide piece and a locking tooth piece; the rear limiting piece comprises a rear limiting bulge arranged on the rear side of the platform surface, a rear bayonet arranged on the rear limiting bulge and a rear clamping block arranged on the rear side of the tibial gasket, and the front limiting piece comprises a front limiting bulge arranged on the front side of the platform surface, a front bayonet arranged on the front limiting bulge and a front clamping hook arranged on the rear side of the tibial gasket, wherein the rear clamping block is in clamping fit with the rear bayonet, and the front clamping hook is in clamping fit with the front bayonet; the guide piece is including setting up at the protruding guide way in the middle part of the plane and setting up at the guide way in shank gasket middle part, and the direction that the guide is protruding along the rear side of shank platform to the front side extends, guide way and the protruding cooperation of direction, and locking tooth spare sets up the border department in the protruding at least one side of guide, and in-process when back fixture block and back bayonet socket joint complex, locking tooth spare and the lateral wall of guide way stop the cooperation, when back fixture block and back bayonet socket joint complex, locking tooth spare and the lateral wall locking cooperation of guide way.

Further, the locking tooth piece comprises a guide surface and a stop surface connected with the guide surface at an acute angle, the guide surface is in guide contact with the side wall surface of the guide groove, and the stop surface is in stop contact with the side wall surface of the guide groove.

Further, the acute included angle is between 80 degrees and 85 degrees.

Further, the locking tooth comprises a first tooth part and a second tooth part, wherein the first tooth part is arranged on the edge of the first side of the guide protrusion and is connected with the top surface of the guide protrusion, and the second tooth part is arranged below the edge of the second side of the guide protrusion and is a preset distance from the top surface of the guide protrusion.

Further, a clamping opening connected with the side wall of the rear bayonet is formed in the platform surface, and a clamping block matched with the clamping opening in a clamping mode is arranged on the rear clamping block.

Further, the locking structure further comprises a first anti-withdrawal piece, the first anti-withdrawal piece comprises an elastic buckle arranged on the guide protrusion and an anti-withdrawal groove communicated with the guide groove, and the elastic buckle is in extrusion fit with the anti-withdrawal groove.

Further, the elastic buckle comprises a first connecting section and a second connecting section which are arranged at intervals along the extending direction of the guide protrusion, the elastic buckle further comprises an elastic body connected between the first connecting section and the second connecting section, a first deformation gap is formed between the elastic body and the platform surface, and the elastic body is in extrusion fit with the anti-withdrawal groove.

Further, the elastomer includes first body section and the second body section that the interval set up, forms the second deformation clearance with first deformation clearance intercommunication between first body section and the second body section, and the first end of first body section and the first end of second body section are all connected on first linkage segment, and the second end of first body section and the second end of second body section are all connected on the second linkage segment, and first body section and second body section all have the evagination section that deviates from the setting each other, evagination section and anti-escape groove extrusion fit.

Further, the locking structure further comprises a second anti-retreating piece, wherein the second anti-retreating piece comprises a rotation stopping block arranged on the guide protrusion, a rotation stopping groove communicated with the guide groove, an anti-retreating groove arranged on the rotation stopping block and an anti-retreating protrusion arranged on the side wall of the rotation stopping groove, and the anti-retreating protrusion is in extrusion fit with the anti-retreating groove.

Further, two guide inclined planes forming an included angle are arranged at one end of the second connecting section, which faces the front limiting protrusion.

By applying the technical scheme of the invention, the locking device of the artificial knee joint comprises: tibial plateau, tibial insert and locking structure. The tibial plateau has a plateau surface. The locking structure comprises a rear limiting piece, a front limiting piece, a guide piece and a locking tooth piece. The back locating part is including setting up the back spacing arch at the platform surface rear side, setting up the back bayonet socket on the spacing arch in back and setting up the back fixture block at shank gasket rear side, and preceding locating part is including setting up the preceding spacing arch of platform front side, setting up the preceding bayonet socket on preceding spacing arch and setting up the preceding pothook at shank gasket rear side, and wherein, back fixture block and back bayonet socket joint cooperation, preceding pothook and preceding bayonet socket joint cooperation. The guide piece comprises a guide bulge arranged in the middle of the plane surface and a guide groove arranged in the middle of the tibial gasket, the guide bulge extends along the direction from the rear side to the front side of the tibial platform, and the guide groove is matched with the guide bulge in a guide manner, so that the tibial gasket can be stably pushed in, and the locking tooth piece is arranged at the edge of at least one side of the guide bulge. In the process of the clamping fit of the rear clamping block and the rear bayonet, as the side wall of the locking tooth piece is in stop fit with the side wall of the guide groove, when the tibial gasket is pushed in first, the tibial gasket is prevented from retreating for a certain distance relative to the tibial platform, the subsequent clamping block and the rear bayonet are conveniently and smoothly clamped and matched, and the tibial gasket is easy to push in. When the rear clamping block is pushed into the rear bayonet, the locking tooth piece is in locking fit with the side wall of the guide groove, so that the rear clamping block is kept at the position pushed into the rear bayonet. Then, when hammering the tibia gasket, the rear clamping block is smoothly clamped and matched with the rear bayonet, and the front clamping hook can be smoothly clamped and matched with the front bayonet, so that hammering and locking are easy. Therefore, the technical scheme of the application effectively solves the problem that the tibial gasket is difficult to push in the process of the clamping and matching of the rear clamping block and the rear bayonet in the related technology, so that the tibial gasket is retracted for a certain distance.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

fig. 1 is a schematic perspective view showing an embodiment one of a locking device for an artificial knee joint according to the present invention;

FIG. 2 is a schematic perspective view showing the locking device of the artificial knee joint of FIG. 1 during the process of snap-fitting the rear latch block with the rear bayonet;

FIG. 3 shows a schematic top view of a tibial plateau of the locking device of the artificial knee joint of FIG. 1;

fig. 4 shows an enlarged schematic view of the tibial plateau of fig. 3 at a;

FIG. 5 shows a schematic perspective view of a tibial plateau of the locking device of the artificial knee joint of FIG. 1;

fig. 6 shows an enlarged schematic view of the tibial plateau of fig. 5 at B;

FIG. 7 illustrates a schematic perspective view of another view of the tibial plateau of the locking device of the artificial knee joint of FIG. 1;

fig. 8 shows a longitudinal partial cross-sectional schematic view of the tibial plateau of fig. 7;

FIG. 9 illustrates a schematic view of a bottom perspective view of a tibial insert of the locking device of the prosthetic knee joint of FIG. 1;

FIG. 10 illustrates a schematic side view of a tibial insert of the locking device of the prosthetic knee joint of FIG. 1;

FIG. 11 shows a schematic cross-sectional view of the locking device of the artificial knee joint of FIG. 1 at a posterior stop;

FIG. 12 shows a schematic cross-sectional view of the locking device of the artificial knee joint of FIG. 1 at an anterior stop;

fig. 13 shows a schematic view in cross-section from above of a second embodiment of a locking device for an artificial knee joint according to the invention.

Wherein the above figures include the following reference numerals:

10. a tibial plateau; 11. a flat table top; 12. a clamping opening;

20. a tibial insert;

3. a locking structure; 30. a rear limiting member; 31. a rear limit protrusion; 32. a rear bayonet; 33. a rear clamping block; 34. a clamping block;

40. a front limiting member; 41. a front limit protrusion; 42. a front bayonet; 43. a front hook;

50. a guide member; 51. a guide groove; 52. a guide protrusion;

60. locking the tooth; 61. a guide surface; 62. a stop surface; 63. a first tooth portion; 64. a second tooth portion;

70. a first anti-back-out member; 71. an elastic buckle; 711. a first connection section; 712. a second connection section; 713. a guide slope; 714. an elastomer; 715. a first body segment; 716. a second body segment; 717. an outer convex section; 718. a first deformation gap; 719. a second deformation gap; 72. anti-withdrawal grooves;

80. a second anti-back-out member; 81. a rotation stop block; 82. a rotation stopping groove; 83. an anti-withdrawal groove; 84. the anti-withdrawal protrusion.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

As shown in fig. 1 to 12, the present application provides a locking device for an artificial knee joint, and an embodiment of the locking device for an artificial knee joint includes: tibial plateau 10, tibial insert 20 and locking structure 3. The tibial plateau 10 has a plateau surface 11. The locking structure 3 includes a rear limiter 30, a front limiter 40, a guide 50 and locking teeth 60. The rear limiter 30 includes a rear limit protrusion 31 disposed on the rear side of the platform 11, a rear bayonet 32 disposed on the rear limit protrusion 31, and a rear latch 33 disposed on the rear side of the tibial insert 20, and the front limiter 40 includes a front limit protrusion 41 disposed on the front side of the platform 11, a front bayonet 42 disposed on the front limit protrusion 41, and a front latch 43 disposed on the rear side of the tibial insert 20. Wherein, the rear clamping block 33 is matched with the rear bayonet 32 in a clamping way, and the front clamping hook 43 is matched with the front bayonet 42 in a clamping way. The guide member 50 comprises a guide protrusion 52 arranged in the middle of the platform surface 11 and a guide groove 51 arranged in the middle of the tibial gasket 20, the guide protrusion 52 extends along the direction from the rear side to the front side of the tibial platform 10, the guide groove 51 is in guide fit with the guide protrusion 52, the locking tooth member 60 is arranged at the edge of at least one side of the guide protrusion 52, when the rear clamping block 33 is in clamping fit with the rear bayonet 32, the locking tooth member 60 is in stop fit with the side wall of the guide groove 51, and when the rear clamping block 33 is in clamping fit with the rear bayonet 32, the locking tooth member 60 is in locking fit with the side wall of the guide groove 51.

According to the technical scheme of the first embodiment, the locking device of the artificial knee joint comprises: tibial plateau 10, tibial insert 20 and locking structure 3. The tibial plateau 10 has a plateau surface 11. The guide groove 51 is in guide engagement with the guide projection 52 so that the tibial insert 20 can be stably pushed in, and the locking tooth 60 is provided at the edge of at least one side of the guide projection 52. In the process of the clamping and matching of the rear clamping block 33 and the rear bayonet 32, the locking tooth piece 60 is in non-return matching with the side wall of the guide groove 51, so that when the tibial insert 20 is pushed in first, the tibial insert 20 is prevented from retreating for a certain distance relative to the tibial platform 10, the subsequent clamping and matching of the rear clamping block 33 and the rear bayonet 32 is facilitated, and the tibial insert 20 is easy to push in. When the rear latch 33 is pushed into the rear bayonet 32, the locking tooth 60 is in locking engagement with the side wall of the guide groove 51, so that the rear latch 33 is maintained in a position pushed into the rear bayonet 32. When the tibial insert 20 is hammered, the rear clip 33 is smoothly engaged with the rear bayonet 32, and the front hook 43 is smoothly engaged with the front bayonet 42, so that the hammering and locking are easy. Therefore, the technical scheme of the first embodiment effectively solves the problem that the tibial gasket is difficult to push in the process of clamping and matching the rear clamping block and the rear bayonet in the related art, so that the tibial gasket is retracted for a certain distance.

In one embodiment, the tibial plateau 10 is a metal piece and the tibial insert 20 is a plastic piece.

As shown in fig. 1 to 3, pushing in the tibial insert 20 means that the tibial platform 10 is relatively fixed, the tibial insert 20 is inclined with respect to the platform surface 11, the rear clamping block 33 of the tibial insert 20 is pushed in the direction of the pushing force FN1 toward the rear bayonet 32, and when the rear clamping block 33 is pushed into the rear bayonet 32, the front clamping hook 43 of the tibial insert 20 is then hammered in the direction of the hammering force FN2 toward the front bayonet 42.

As shown in fig. 1 to 12, the locking tooth 60 includes a guide surface 61 and a retaining surface 62 connected to the guide surface 61 at an acute angle, and in the process of the engagement and engagement between the rear clip 33 and the rear clip opening 32, when the tibial insert 20 receives thrust, the guide surface 61 is in guide contact with the side wall surface of the guide groove 51, so that the rear clip 33 can be smoothly pushed into the rear clip opening 32, and when the tibial insert 20 does not receive thrust, the retaining surface 62 is in retaining contact with the side wall surface of the guide groove 51, and the retaining surface 62 receives resistance from the side wall surface of the guide groove 51, so that the rear clip 33 is prevented from being withdrawn from the pushed-in position in the pushing-out direction.

As shown in fig. 1 to 12, in order to ensure that the guide surface 61 is in guide contact with the side wall surface of the guide groove 51 and the retaining surface 62 is in retaining contact with the side wall surface of the guide groove 51, the acute angle is between 80 degrees and 85 degrees. The acute included angle is preferably 80 degrees or 82.5 degrees or 85 degrees.

As shown in fig. 5 to 12, the locking tooth 60 includes a first tooth 63 provided on an edge of a first side of the guide projection 52 and connected to a top surface of the guide projection 52, and a second tooth 64 provided below an edge of a second side of the guide projection 52 and having a predetermined distance from the top surface of the guide projection 52. During the process of the clamping and matching of the rear clamping block 33 and the rear bayonet 32, the part of the first tooth part 63 connected with the top surface of the guide bulge 52 can be in backstop matching with the bottom surface of the guide groove 51, and the rest part of the first tooth part 63 is in backstop matching with the side surface of the guide groove 51, so that the tibial gasket 20 is prevented from backing a certain distance relative to the tibial platform 10 and the tibial gasket 20 is prevented from deflecting relative to the tibial platform 10; the second tooth portion 64 has a larger area of the second tooth portion 64 that is in non-return engagement with the groove side surface of the guide groove 51 than the area of the first tooth portion 63 that is in contact with the groove side surface of the guide groove 51, which is advantageous in increasing frictional resistance. In this way, the first tooth 63 and the second tooth 64 provided on both sides of the guide projection 52 cooperate to prevent the tibial insert 20 from being retracted a certain distance relative to the tibial plateau 10.

As shown in fig. 5 to 12, the platform surface 11 is provided with a locking hole 12 connected to a side wall of the rear bayonet 32, and the rear lock block 33 is provided with a locking block 34 locked to the locking hole 12. When the rear clamping block 33 is in clamping fit with the rear clamping opening 32, the clamping opening 12 can increase the volume of the rear clamping opening 32, and the clamping block 34 can increase the volume of the rear clamping block 33, so that the relative position of the rear clamping block 33 which is in clamping fit with the rear clamping opening 32 is unchanged, the reliability of the limiting effect of the rear limiting part 30 is further ensured, and the locking effect is reliably ensured under the combined action of the front limiting part 40.

As shown in fig. 5 to 12, the locking structure 3 further includes a first withdrawal preventing member 70, the first withdrawal preventing member 70 including an elastic buckle 71 provided on the guide projection 52 and a withdrawal preventing groove 72 communicating with the guide groove 51, the elastic buckle 71 being press-fitted with the withdrawal preventing groove 72. In the process of the clamping fit of the rear clamping block 33 and the rear bayonet 32, the elastic buckle 71 and the anti-back groove 72 are in extrusion fit, so that the guide fit distance between the guide protrusion 52 and the guide groove 51 can be prolonged, the rear clamping block 33 can be ensured to be smoothly pushed into the rear bayonet 32, interference is generated in the deflection direction of the tibial gasket 20, and the tibial gasket 20 is prevented from deflecting relative to the tibial platform 10. On the other hand, the contact area between the guide projection 52 and the guide groove 51 is increased, so that the frictional resistance is increased, and the tibial insert 20 is further prevented from retreating by a certain distance relative to the tibial plateau 10.

As shown in fig. 5 to 12, in order to ensure that the elastic buckle 71 has a sufficient elasticity, and generates a large frictional resistance by press-fitting with the withdrawal prevention groove 72, the elastic buckle 71 includes a first connection section 711 and a second connection section 712 spaced apart along the extending direction of the guide protrusion 52, and the elastic buckle 71 further includes an elastic body 714 connected between the first connection section 711 and the second connection section 712. A first deformation gap 718 is provided between the elastic body 714 and the platform 11, and the elastic body 714 is in press fit with the anti-back-out groove 72. The first deformation gap 718 is provided to allow the elastic body 714 to have a deformation space when the rear clamping block 33 continues to be pushed into the rear bayonet 32, so that the rear clamping block 33 can smoothly continue to be pushed into the rear bayonet 32, and meanwhile, when the rear clamping block 33 is not pushed, enough friction resistance can be maintained when the elastic body 714 is in press fit with the anti-back groove 72.

As shown in fig. 5 to 12, in order to further satisfy the requirement that the elastic body 714 can maintain a sufficient friction resistance when being press-fitted with the anti-back-out groove 72, the elastic body 714 includes a first body section 715 and a second body section 716 that are disposed at intervals, a second deformation gap 719 that communicates with the first deformation gap 718 is formed between the first body section 715 and the second body section 716, the first end of the first body section 715 and the first end of the second body section 716 are both connected to the first connecting section 711, the second end of the first body section 715 and the second end of the second body section 716 are both connected to the second connecting section 712, the first body section 715 and the second body section 716 have outer protruding sections 717 that are disposed away from each other, and the outer protruding sections 717 are press-fitted with the anti-back-out groove 72. The male section 717 is preferably a male arc section.

As shown in fig. 5 to 12, in order to facilitate the elastic buckle 71 to smoothly enter the anti-back groove 72, one end of the second connecting section 712 facing the front limiting protrusion 41 is provided with two guiding inclined planes 713 forming an included angle, and the two guiding inclined planes 713 are in guiding contact with the groove side wall of the anti-back groove 72, so that the elastic buckle 71 smoothly enters the anti-back groove 72.

In the second embodiment of the locking device for an artificial knee joint of the present application, the difference from the first embodiment is the structure of the first retraction preventing member 70. As shown in fig. 13, in the second embodiment, the locking structure 3 further includes a second anti-back member 80, and the second anti-back member 80 includes a rotation stop block 81 provided on the guide projection 52, a rotation stop groove 82 communicating with the guide groove 51, an anti-back groove 83 provided on the rotation stop block 81, and an anti-back projection 84 provided on a side wall of the rotation stop groove 82, and the anti-back projection 84 is press-fitted with the anti-back groove 83. The rotation stop block 81 and the rotation stop groove 82 are in rotation stop engagement to interfere with each other in the direction of deflection of the tibial insert 20, thereby preventing the tibial insert 20 from deflecting relative to the tibial plateau 10. And the anti-back-up protrusion 84 and the anti-back-up groove 83 are in press fit, so that the contact area between the anti-rotation block 81 and the anti-rotation groove 82 can be increased, the friction resistance is increased, and the tibial insert 20 is further prevented from backing up a certain distance relative to the tibial platform 10. The anti-back-out protrusions 84 are preferably anti-back-out protruding arc portions.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A locking device for an artificial knee joint, comprising:

a tibial plateau (10), the tibial plateau (10) having a plateau surface (11);

a tibial insert (20);

the locking structure (3) comprises a rear limiting piece (30), a front limiting piece (40), a guide piece (50) and a locking tooth piece (60); the rear limiting piece (30) comprises a rear limiting bulge (31) arranged on the rear side of the Ping Taimian (11), a rear clamping opening (32) arranged on the rear limiting bulge (31) and a rear clamping block (33) arranged on the rear side of the tibial gasket (20), the front limiting piece (40) comprises a front limiting bulge (41) arranged on the front side of the Ping Taimian (11), a front clamping opening (42) arranged on the front limiting bulge (41) and a front clamping hook (43) arranged on the rear side of the tibial gasket (20), wherein the rear clamping block (33) is in clamping fit with the rear clamping opening (32), and the front clamping hook (43) is in clamping fit with the front clamping opening (42);

the guide piece (50) comprises a guide bulge (52) arranged in the middle of the Ping Taimian (11) and a guide groove (51) arranged in the middle of the tibial gasket (20), the guide bulge (52) extends along the direction from the rear side to the front side of the tibial platform (10), the guide groove (51) is in guide fit with the guide bulge (52), the locking tooth piece (60) is arranged at the edge of at least one side of the guide bulge (52), and when the rear clamping block (33) is in clamping fit with the rear clamping opening (32), the locking tooth piece (60) is in retaining fit with the side wall of the guide groove (51), and when the rear clamping block (33) is in clamping fit with the rear clamping opening (32), the locking tooth piece (60) is in locking fit with the side wall of the guide groove (51);

the locking tooth piece (60) comprises a guide surface (61) and a stopping surface (62) connected with the guide surface (61) at an acute angle, the guide surface (61) is in guide contact with the side wall surface of the guide groove (51), and the stopping surface (62) is in stop contact with the side wall surface of the guide groove (51);

the locking tooth (60) comprises a first tooth (63) and a second tooth (64), wherein the first tooth (63) is arranged on the edge of the first side of the guide protrusion (52) and is connected with the top surface of the guide protrusion (52), and the second tooth (64) is arranged below the edge of the second side of the guide protrusion (52) and is spaced from the top surface of the guide protrusion (52) by a preset distance.

2. The prosthetic knee locking device of claim 1, wherein the acute included angle is between 80 degrees and 85 degrees.

3. The artificial knee joint locking device according to claim 1, wherein the platform surface (11) is provided with a clamping opening (12) connected with the side wall of the rear bayonet (32), and the rear clamping block (33) is provided with a clamping block (34) matched with the clamping opening (12) in a clamping manner.

4. The locking device of an artificial knee joint according to claim 1, wherein the locking structure (3) further comprises a first anti-back-out member (70), the first anti-back-out member (70) comprising an elastic buckle (71) arranged on the guide protrusion (52) and an anti-back-out groove (72) in communication with the guide groove (51), the elastic buckle (71) being in press fit with the anti-back-out groove (72).

5. The artificial knee joint locking device according to claim 4, wherein the elastic buckle (71) includes a first connecting section (711) and a second connecting section (712) disposed at intervals along the extending direction of the guide projection (52), the elastic buckle (71) further includes an elastic body (714) connected between the first connecting section (711) and the second connecting section (712), a first deformation gap (718) is provided between the elastic body (714) and the platform surface (11), and the elastic body (714) is press-fitted with the anti-back groove (72).

6. The locking device of an artificial knee joint according to claim 5, wherein the elastic body (714) comprises a first body section (715) and a second body section (716) which are arranged at intervals, a second deformation gap (719) which is communicated with the first deformation gap (718) is formed between the first body section (715) and the second body section (716), the first end of the first body section (715) and the first end of the second body section (716) are both connected to the first connecting section (711), the second end of the first body section (715) and the second end of the second body section (716) are both connected to the second connecting section (712), the first body section (715) and the second body section (716) are both provided with outer protruding sections (717) which are arranged away from each other, and the outer protruding sections (717) are in press fit with the anti-back grooves (72).

7. The locking device of an artificial knee joint according to claim 1, wherein the locking structure (3) further comprises a second anti-back member (80), the second anti-back member (80) comprising a rotation stopping block (81) provided on the guide projection (52), a rotation stopping groove (82) communicating with the guide groove (51), an anti-back groove (83) provided on the rotation stopping block (81), and an anti-back projection (84) provided on a side wall of the rotation stopping groove (82), the anti-back projection (84) being press-fitted with the anti-back groove (83).

8. The artificial knee joint locking device according to claim 6, wherein the end of the second connecting section (712) facing the anterior limit protrusion (41) is provided with two angled guiding ramps (713).