CN211485103U

CN211485103U - Tibial plateau holds in palm and uses its unicondylar knee joint prosthesis

Info

Publication number: CN211485103U
Application number: CN201921830671.5U
Authority: CN
Inventors: 史春宝
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-09-15
Anticipated expiration: 2029-10-28

Abstract

The utility model relates to the field of medical equipment, a tibial plateau holds in palm and uses its unicondylar knee joint prosthesis is disclosed. The unicondylar knee prosthesis comprises: the first platform part and fix the connecting portion on the bottom surface of first platform part, wherein, connecting portion include that the interval sets up at least one fixed column and at least one fin on the bottom surface of first platform part, and the fin has the convergent width in the direction from the bottom surface to deviating from the bottom surface. The utility model discloses a unicondylar knee joint prosthesis can fix with human bone tissue better to improve the stability of unicondylar knee joint prosthesis in the human body behind the unicondylar knee joint replacement operation, with the normal kinematics characteristic of ensureing the knee joint.

Description

Tibial plateau holds in palm and uses its unicondylar knee joint prosthesis

Technical Field

The utility model relates to the field of medical equipment, concretely relates to tibial plateau holds in palm and uses its unicondylar knee joint prosthesis.

Background

The unicondylar knee prosthesis is a surgical implant used for replacing the knee joint of a part of a human body and is used for unicondylar knee replacement surgery. Compared with the total knee replacement operation, the unicondylar knee replacement operation can obviously reduce the bleeding condition of the patient in the operation and the recovery time after the operation, and maintains the normal dynamics of the knee joint because the anterior cruciate ligament and the posterior cruciate ligament of the human body are reserved, thereby enabling the patient to obtain higher level of the postoperative knee joint moving capability.

For the unicondylar knee replacement surgery, whether the unicondylar knee prosthesis can be stably and firmly matched in the body of a patient is crucial to the success of the surgery, and meanwhile, the postoperative pain of the patient can be reduced, and the postoperative revision possibility is reduced. Existing knee prostheses generally include a femoral condyle, a platform support, and a platform pad located between the femoral condyle and the platform support. However, the fixation between the femoral condyle and the femur of the human body and the fixation between the platform support and the tibia of the human body in the conventional knee joint prosthesis are not ideal, and the fixation between the unicondylar knee joint prosthesis and the bone tissue of the human body is easily loosened.

In view of the deficiencies of the prior art, it would be desirable to have a unicondylar knee prosthesis that better secures to the bony tissue of the human body, thereby improving the stability of the unicondylar knee prosthesis in the human body after unicondylar knee replacement surgery to ensure the normal kinematics of the knee.

SUMMERY OF THE UTILITY MODEL

In order to make the unicondylar knee joint prosthesis fix with human bone tissue better to improve the stability of unicondylar knee joint prosthesis in the human body behind the unicondylar knee joint replacement operation, in order to ensure the normal kinematics characteristic of knee joint, the utility model provides a tibial plateau holds in the palm and uses its unicondylar knee joint prosthesis.

According to the utility model discloses a first aspect provides a tibial plateau holds in palm. The tibial plateau support comprises a first plateau portion and a connecting portion fixed on the bottom surface of the first plateau portion, wherein the connecting portion comprises at least one fixing column and at least one wing piece which are arranged on the bottom surface of the first plateau portion at intervals, and the wing piece has a gradually-reduced width in the direction from the bottom surface to the direction departing from the bottom surface.

Further, the bottom surface of the first platform portion includes an outer edge portion on which the flap is formed and an inner portion surrounded by the outer edge portion in which the fixing post is formed.

Furthermore, the number of the fixed columns is multiple, and a connecting line of the position of each fixed column and the position of each fin is polygonal.

Preferably, the number of the fixed columns is two, and a connecting line between the positions of the two fixed columns and the positions of the fins is triangular.

It is also preferred that the fins and the fixing posts are both perpendicular to the underside of the platform.

It is also preferred that the axes of the two fixed posts are not parallel, the fixed posts are both disposed inclined toward the peripheral edge portion, or the two fixed posts are disposed inclined toward each other.

Further, at least one transverse slot is formed in the outer surface of the tab.

Further, the fin includes first hypotenuse and the second hypotenuse that deviates from the bottom surface and extends to crossing in order to form the pointed end with the second hypotenuse, and the contained angle of first hypotenuse and bottom surface is the acute angle, and the contained angle of second hypotenuse and bottom surface is the obtuse angle.

Preferably, the tip is configured as a smooth surface.

Furthermore, the fixed column comprises a diameter-reducing section and an diameter-expanding section, wherein the diameter-reducing section extends from the bottom surface and deviates from the bottom surface, and the diameter-expanding section is coaxially connected with the diameter-reducing section.

Preferably, the fixing post has an annular groove formed thereon.

It is also preferable that the annular groove is formed in a large diameter area of the fixing post.

Further, an accommodating groove is formed in the top face of the first platform portion, and a clamping groove is formed in the side wall of the accommodating groove.

According to another aspect of the present invention, a unicondylar knee prosthesis is provided. The unicondylar knee joint prosthesis comprises a tibial plateau support and a tibial plateau pad fixedly connected with the tibial plateau support, wherein the tibial plateau pad comprises a second plateau part and a fixing part which is fixed on the bottom surface of the second plateau part and used for being accommodated in an accommodating groove, and a clamping protrusion matched with a clamping groove is formed on the side wall of the fixing part.

Further, the unicondylar knee prosthesis further includes a femoral condyle in abutting engagement with a top surface of the second platform portion, and a region of the top surface of the second platform portion in abutting engagement with the femoral condyle is configured to be planar.

Preferably, the area of the top surface of the second platform portion that fits against the femoral condyle may be configured as a curved surface with a vanishing curvature.

Further, the femoral condyle comprises an outer curved surface in butt fit with the top surface of the second platform part and an inner surface used for being connected with a femur of a human body, the inner surface comprises a first plane, a second plane and a third plane which are connected in an obtuse angle in sequence, the included angle between the first plane and the second plane is smaller than the included angle between the second plane and the third plane, a first fixing column is formed on the second plane, a second fixing column arranged in parallel with the first fixing column is formed on the third plane, and the included angle between the axis of the first fixing column and the first plane ranges from 10 degrees to 20 degrees.

Preferably, the axis of the first fixing column forms an angle of 15 ° with the first plane.

Further, at least one axial groove is formed in the outer peripheral wall of the first fixing column and/or the second fixing column.

The single-condyle knee joint prosthesis has simple structure and ensures that the fixed connection relationship between the tibial plateau support and the tibia of the human body and the fixed connection relationship between the femoral condyle and the femur of the human body are stable; the structure of the tibial platform pad not only restores the normal natural motion process of the human knee joint, but also ensures the perfect matching of the tibial platform pad and the tibial platform support, thereby enabling the implanted prosthesis to be stable and firm and prolonging the service life of the unicondylar knee joint prosthesis on the premise of ensuring the normal kinematics characteristic of the knee joint.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a schematic structural view of a unicondylar knee prosthesis;

fig. 2 is a schematic structural view of the tibial plateau tray shown in fig. 1;

fig. 3 is a bottom view of the tibial plateau tray of fig. 1;

FIG. 4 is a schematic structural view of the tibial plateau pad shown in FIG. 1;

FIG. 5 is a schematic view of the femoral condyle shown in FIG. 1.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

Fig. 1 shows the structure of a unicondylar knee prosthesis 100 according to the present invention, and fig. 2 and 3 show the structure of the tibial plateau tray 1 shown in fig. 1. As shown in fig. 2 and 3, the tibial plateau tray 1 includes a first plateau 11 and a connecting portion 12 fixed to a bottom surface of the first plateau 11. Wherein the connecting portion 12 includes at least one fixing post 121 and at least one tab 122 spaced apart from each other on the bottom surface of the first platform portion 11, and the tab 122 has a width that is tapered in a direction from the bottom surface to away from the bottom surface.

The utility model discloses a tibial plateau holds in palm 1 when the installation, the width that has the convergent, be formed with tip's fin 122 promptly, and fixed column 121 homoenergetic inserts in human sclerotin fast and holds in the palm 1 fixed with human sclerotin with the realization tibial plateau, under at least one fixed column 121 and at least one fin 122's combined action, fin 122 flaky surface has increased the area of contact of fin 122 with human sclerotin, such area not only can help restricting fixed column 121 and take place to rotate at fixed in-process, in order to avoid tibial plateau to hold in the palm 1 self and take place to rotate, still help having restricted fixed column 121 the ascending removal of horizontal direction, in order to avoid tibial plateau to hold in the palm 1 removal on the horizontal direction. The number of the fixing columns 121 and the wing pieces 122 and the relative position relationship between the fixing columns 121 and the wing pieces 122 are specifically limited, the fixing columns 121 and the wing pieces 122 are mutually restrained, and the stability of the fixed connection between the tibial platform support 1 and human bone can be greatly improved.

In a preferred embodiment as shown in fig. 2 and 3, the bottom surface of the first platform part 11 of the tibial plateau tray 1 may include a peripheral edge part 112 and an inner part 113 formed by being surrounded by the peripheral edge part 112, a tab 122 may be formed on the peripheral edge part 112, and a fixing post 121 may be formed in the inner part 113. Through the arrangement, the wing piece 122 and the fixing column 121 are respectively positioned in different areas of the bottom surface of the first platform part 11, so that the extrusion stress of the fixing column 121, the wing piece 122 and the human tibia can be dispersed, the aim of protecting the bone of the human body due to the fact that the same area of the human tibia bears concentrated extrusion stress can be avoided, and meanwhile, the wing piece 122 positioned on the edge part 112 can be conveniently machined and manufactured.

Preferably, the number of the fixing posts 121 may be multiple, and a connection line between a position of each fixing post 121 and a position of the wing 122 may be a polygon. Through this setting will make the fixed bearing structure who is built by a plurality of fixed columns 121 and fin 122 more reasonable to realize with the more stable fixed connection relation of human shin bone.

Further preferably, in order to simplify the structure of the tibial plateau tray 1 while ensuring the fixing effect of the fixing posts 121 and the fins 122, the number of the fixing posts 121 may be two, the number of the fins 122 may be one, and a connecting line between the positions of the two fixing posts 121 and the positions of the fins 122 may be configured as a triangle.

Further, the axes of the two fixing posts 121 may not be parallel, for example, the fixing posts 121 may be disposed to be inclined toward the outer edge portion, and for example, the two fixing posts 121 may be disposed to be inclined toward each other. Through the arrangement, the two fixing columns 121 are not easy to be separated from the tibia of the human body after being fixedly connected with the tibia of the human body. It is also preferable that both the wing pieces 122 and the fixing posts 121 are perpendicular to the bottom surface of the first platform part 11. The external force for fixing the fin 12 and the fixing column 121 in the tibia of the human body is smaller through the arrangement, and the protection effect on the tibia of the human body can be achieved.

According to the present invention, the structure of the wing 122 may be constructed variously.

In a preferred embodiment, as shown in FIG. 2, at least one transverse slot 1221 may be formed in the outer surface of the tab 122. The arrangement of the transverse groove can increase the friction force between the fins 122 and the tibia of the human body, namely, the fins 122 are not easy to vertically deviate from the tibia of the human body, so that the fixed connection between the tibial platform support 1 and the tibia of the human body is more stable.

In another preferred embodiment, as shown in FIG. 3, the tab 122 may include a first angled edge 1222 and a second angled edge 1223 extending away from the bottom surface, the first angled edge 1222 and the second angled edge 1223 extending to intersect to form a tip, the first angled edge 1222 may be angled at an acute angle with respect to the bottom surface, and the second angled edge 1223 may be angled at an obtuse angle with respect to the bottom surface. Through the arrangement, the wing pieces 122 can easily enter the human tibia under the action of external force and are not easy to be separated from the human tibia.

Preferably, the tip may be configured as a smooth surface. This arrangement makes the fins 122 less likely to damage the tibia when entering the human tibia.

It is also preferred that the first and/or second

beveled edges

1222, 1223 be configured with serrations that allow the tab 122 to be easily inserted into the human tibia under an external force, and not easily removed therefrom after insertion. Also preferably, the first angled edge 1222 and/or the second angled edge 1223 can be configured as a contoured surface, as shown in fig. 3, that helps prevent the tab 122 from backing out of the human tibia.

According to the present invention, as shown in fig. 3, the fixing column 121 may include a diameter-expanding section 1212 extending from the bottom surface away from the bottom surface and coaxially connected to the diameter-expanding section 1211. This setting can effectively avoid the fixed column 121 to deviate from in human shin bone after inserting human shin bone.

Preferably, in order to further prevent the fixing post 121 from coming off, a circular groove 1213 may be formed on the outer circumferential wall of the fixing post 121. Further preferably, in order to secure the structural strength of the fixing post 121 itself, an annular groove 1213 may be formed in a large diameter area of the fixing post 121.

Returning to fig. 2, the top surface of the first platform 11 of the tibial plateau tray 1 of the present invention may further be formed with a receiving groove 111, and a side wall of the receiving groove 111 may be formed with a clamping groove 1111. This arrangement allows the first platform portion 11 of the tibial platform tray 1 to facilitate more stable fixation to a tibial platform pad (described in more detail below).

The utility model also provides a unicondylar knee joint prosthesis 100, as shown in fig. 1, this unicondylar knee joint prosthesis 100 includes that above-mentioned tibial plateau holds in the palm 1, and hold in the palm 1 fixed connection's tibial plateau pad 2 with tibial plateau, combine fig. 4 to show, tibial plateau pad 2 can include second platform portion 21 and fix the fixed part 22 that is used for holding in holding tank 111 on the bottom surface of second platform portion 21, can be formed with on the lateral wall of fixed part 22 and be used for with draw-in groove 1111 complex card suddenly 211. The cooperation of draw-in groove 1111 and card process 211 can realize the quick fixed of tibial plateau pad 2 and tibial plateau support 1.

The unicondylar knee prosthesis 100 of the present invention may further include a femoral condyle 3 (shown in fig. 5) engaged with the top surface of the second platform portion 21 in abutment, and the region of the top surface of the second platform portion 21 engaged with the femoral condyle 3 in abutment may be configured as a plane. This plane should be understood as a curved surface with a curvature that tends to zero, and this arrangement allows a smaller contact surface of the femoral condyle 3 with the tibial plateau pad 2, whereby the mutual movement between the femoral condyle 3 and the tibial plateau pad 2 is less restricted, contributing to an improved mobility of the unicondylar knee prosthesis 100. Meanwhile, the arrangement also enables the function of the unicondylar knee joint prosthesis constructed by the abutting relation and the mutual movement relation between the femoral condyle 3 and the tibial platform pad 2 to be closer to the function of the human knee joint, thereby being beneficial to improving the use comfort of the unicondylar knee joint prosthesis 100.

In the embodiment as shown in fig. 5, the femoral condyle 3 may include an outer curved surface 31 abutting against the top surface of the second platform 21 and an inner surface 32 for connecting with the femur of the human body, the inner surface 32 may include a first plane 321, a second plane 322 and a third plane 323 connected in an obtuse angle, the angle between the first plane 321 and the second plane 322 may be smaller than the angle between the second plane 322 and the third plane 323, the second plane 322 may have a first fixing post 3221 formed thereon, the third plane 323 may have a second fixing post 3231 arranged in parallel with the first fixing post 3221 formed thereon, and the angle between the axis of the first fixing post 3221 and the first plane 321 may range from 10 ° to 20 °. The setting can effectively improve the stability of the fixation of the femoral condyle 3 and the human femur.

Preferably, the axis of the first fixing pillar 3221 may include an angle of 15 ° with the first plane 321. The angle is beneficial to restoring the femoral head structure of the human knee joint on the basis of ensuring the stability of fixing the femoral condyle 3 and the human femur.

Also preferably, as shown in fig. 5, at least one axial groove 324 may be formed on an outer circumferential wall of the first fixing post 3221 and/or the second fixing post 3231. By the arrangement, the first fixing column 3221 and the second fixing column 3231 are not easy to axially rotate after being inserted into the femur of the human body, but are not easy to separate from the femur of the human body, so that the stability of fixing the femoral condyle 3 and the femur of the human body is improved.

The unicondylar knee joint prosthesis 100 of the utility model has reasonable structure, effectively ensures the stability of fixation between the tibial plateau support 1 and the tibia of the human body and between the femoral condyle 3 and the femur of the human body; meanwhile, the structure of the tibial platform pad 2 is not only beneficial to restoring the normal natural knee joint movement process of a human body, but also ensures the convenient matching of the tibial platform pad 2 and the tibial platform support 1, so that the implanted prosthesis is stable and firm, and the service life of the unicondylar knee joint prosthesis 100 is prolonged.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A tibial plateau tray comprising a first plateau portion and a connecting portion secured to a bottom surface of the first plateau portion, wherein the connecting portion includes at least one fixation post and at least one tab disposed at intervals on the bottom surface of the first plateau portion, the tab having a tapered width in a direction from the bottom surface to away from the bottom surface.

2. The tibial plateau of claim 1 wherein the bottom surface of the first plateau includes a peripheral edge portion on which the tab is formed and an interior portion surrounded by the peripheral edge portion in which the securing post is formed.

3. The tibial plateau tray of claim 2, wherein the number of the fixing posts is plural, and a line connecting a position of each fixing post and a position of the wing is polygonal.

4. A tibial plateau tray according to any one of claims 1 to 3 wherein the outer surface of the tab has at least one transverse slot formed therein.

5. The tibial plateau of any one of claims 1 to 3 wherein the tab includes a first angled edge and a second angled edge extending away from the bottom surface, the first angled edge and the second angled edge extending to intersect to form a tip, the first angled edge being at an acute angle to the bottom surface and the second angled edge being at an obtuse angle to the bottom surface.

6. The tibial plateau tray of any one of claims 1 to 3 wherein the fixation post includes a tapered section extending from the bottom surface away from the bottom surface and an enlarged diameter section coaxially connected to the tapered section.

7. The tibial plateau of any one of claims 1 to 3 wherein a receiving slot is also formed on the top surface of the first plateau and a catch slot is formed on a side wall of the receiving slot.

8. A unicondylar knee prosthesis comprising the tibial plateau tray of claim 7, and a tibial plateau pad fixedly connected to the tibial plateau tray, wherein the tibial plateau pad comprises a second plateau portion and a fixation portion fixed to a bottom surface of the second plateau portion for being received in the receiving slot, and wherein a lateral wall of the fixation portion has a detent formed thereon for engaging a detent groove.

9. The unicondylar knee prosthesis of claim 8, further comprising a femoral condyle in abutting engagement with the top surface of the second platform portion, the area of the top surface of the second platform portion in abutting engagement with the femoral condyle being configured as a flat surface.

10. The unicondylar knee prosthesis of claim 9, wherein the femoral condyle comprises an outer curved surface in abutting engagement with the top surface of the second platform portion and an inner surface for connection with a femur of a human body, the inner surface comprises a first plane, a second plane and a third plane which are connected in sequence at an obtuse angle, an included angle between the first plane and the second plane is smaller than an included angle between the second plane and the third plane, a first fixing column is formed on the second plane, a second fixing column arranged in parallel with the first fixing column is formed on the third plane, and an included angle between an axis of the first fixing column and the first plane ranges from 10 ° to 20 °.

11. The unicondylar knee prosthesis of claim 10, wherein the peripheral wall of the first fixation post and/or the second fixation post has at least one axial slot formed therein.