Tibial platform and associated instrumentation

Abstract

The application provides a knee joint prosthesis tibial plateau capable of enhancing fixation and a matching tool, and specifically comprises: a tibial tray, which is a hollow cylindrical structure and is externally provided with three convex bodies; a base, which is provided with a groove penetrating into the tibial tray and is fixed on the tibial tray; a pushing device, which comprises: an extension rod arranged at both ends of a worm, a worm with threads arranged on the outer surface of both ends, a turbine arranged at both sides of the worm, an upper support body arranged on the top of the turbine and connected with a fixing device through a first connecting body, and a lower support body arranged at the bottom of the turbine and connected with the fixing device; and the fixing device is a hollow cone, which is internally provided with a first spring, one end of the first spring is connected with the first connecting body, and the other end is connected with a fixing block. The technical scheme of the application effectively solves the technical problem that after the knee joint prosthesis is implanted into the tibia, the tibial plateau is not stable, the prosthesis is loose and comes off, and bone fusion is affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular, a tibial platform and its matching tools. BACKGROUND

[0002] Knee joint is an important weight-bearing joint of lower limbs, and knee joint degenerative osteoarthritis is a common disease in the elderly. For severe knee joint diseases, knee arthroplasty needs to be selected as a treatment method to improve the function of the knee joint stably in the long term. At present, pure mechanical knee prosthesis as a prosthesis in knee arthroplasty is widely used, aiming to relieve pain, correct deformity and restore joint function. The tibial platform prosthesis as a key load-bearing component of the knee prosthesis directly determines the success rate of the operation and the service life of the prosthesis.

[0003] Traditional tibial platform prostheses are usually combined with the proximal tibial bone bed by bone cement fixation or biological fixation (non-cement fixation), however, no matter which fixation method is used, the current tibial platform prosthesis still faces some challenges and limitations. The long-term stability of the biological fixation prosthesis depends on the initial mechanical stability in the early stage. If the initial stability is poor, micro-motion will exceed the critical value, leading to fibrous tissue rather than bone tissue growing into the pores, forming a fibrous membrane, and eventually causing aseptic loosening, which is the main reason for the failure of knee arthroplasty. Once aseptic loosening occurs, revision surgery is needed, and the porous coating prosthesis firmly combined with the bone, although it avoids the problem of bone cement removal, the removal process itself will cause a large bone defect, bringing great challenges to subsequent reconstruction.

[0004] Therefore, a new design of tibial platform prosthesis is needed, which can enhance the stability of the tibial platform after surgery while ensuring excellent initial mechanical stability and facilitate removal and reduce bone loss as much as possible in the long-term revision. SUMMARY

[0005] The main purpose of the present application is to provide a tibial platform to solve the problem of insufficient stability of the tibial platform after the knee prosthesis is implanted into the human body.

[0006] In order to achieve the above object, the application provides a kind of enhanced fixed tibial plateau and its matching tool, specifically comprising: tibial support, the tibial support is hollow cylindrical structure with bottom opening, three convex bodies are fixedly arranged on the outer surface of hollow cylindrical structure;Base, the groove is arranged on the base, the groove is through to the inside of tibial support, and the base is fixedly arranged on tibial support;Pushing device, the pushing device is arranged in the inside of tibial support, including: the extension rod being arranged at the both ends of worm, the outer surface of both ends is provided with opposite direction screw, the turbine being arranged at the both sides of worm, the surface of turbine is gear, and the screw of worm is engaged, and turbine is rotatably connected by being contacted with tibial support by cylinder, the upper support body being arranged at the top of turbine and being connected with fixing device by first connecting body, the lower support body being arranged at the bottom of turbine and being hingedly connected with fixing device;The fixing device is hollow cone, and the first spring is arranged in the inside of fixing device, one end of first spring is movably connected with first connecting body, and the other end is connected with fixed block, and the outer surface of bottom of fixing device is provided with barb to enhance fixation.

[0007] Further, the outer surface of the tibial support is sprayed with a nano coating to enhance bone adsorption capacity.

[0008] Further, the base is circular, and the base has three protruding devices and two rectangular grooves, and the distance between the grooves is consistent with the length of the worm structure.

[0009] Further, the extension rod in the pushing device is a cuboid, and two symmetrical rectangular grooves are arranged on the left and right sides of the middle part.

[0010] Further, the upper support body in the pushing device includes a first upper support rod and a second upper support rod, which are connected by a hinge, and the second upper support rod is vertically connected with the first connecting body.

[0011] Further, the lower support body in the pushing device is composed of support rods arranged symmetrically on the left and right sides, and the lower support body is hingedly connected with the fixing device through the first limiting device.

[0012] Further, the connection points of the upper support body and the lower support body in the pushing device on the turbine are located on the same diameter of the turbine, and the distance from the center is consistent.

[0013] Further, the fixing device further includes a second connecting body, which is hingedly connected with the fixing device through a second limiting device and with the tibial support through a third limiting device.

[0014] Further, the second connecting body includes an upper connecting rod and a lower connecting rod, which are connected by a hinge.

[0015] Further, the top of the fixing device is consistent with the circular opening structure of the hollow cylindrical bottom of the tibial tray in size and shape, a fixing block connected with the first spring on the fixing device is a triangular pyramid, and the surface is a porous structure, and the surface reinforcing device is a barb structure.

[0016] According to another aspect of the present application, there is provided an adjusting tool for adjusting the pushing device in the tibial platform, the adjusting tool comprising: a left-right structure identical clamping structure, the upper part of the clamping structure being connected through a second spring, and the middle part being connected through a hinge, the lower part being in a bent shape, the end of the lower part being a rectangular body matched with the rectangular groove structure, the overall width of the clamping structure being matched with the rectangular groove, and the length being half of the length of the extension rod.

[0017] The tibial platform comprises a base, a tibial tray, a pushing device and a fixing device. The base is fixedly arranged above the tibial tray. Three convex bodies and two grooves penetrating through the tibial tray are arranged on the base. The pushing device is arranged in the tibial tray. The upper part of the extension rod extends into the groove, and the bottom is fixed with the two ends of the worm. The outer surfaces of the two ends of the worm are provided with threads in opposite directions. The worm is engaged with the gear on the worm through the surface gear, and is rotatably connected with the tibial tray through the cylinder in the middle of the worm. The upper support body is arranged on the top of the worm and comprises first and second upper support rods. The two support rods are connected through a hinge. The second support rod is connected with the first connecting body perpendicularly, and the first connecting body limits the position of the upper support body. The lower support body is arranged on the lower part of the worm and is hingedly connected with the fixing device, so as to push the fixing device to move downward. The fixing device is a hollow cone. The first spring is arranged in the fixing device symmetrically. One end of the first spring is movably connected with the first connecting body, and the other end is connected with the triangular pyramid fixing block and pushes the fixing block to pop out of the fixing device. The reinforcing device is arranged on the outer surface of the bottom of the fixing device to enhance the fixing. Therefore, the technical scheme of the present application effectively enhances the stability of the tibial platform in the tibial medullary cavity. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments illustrated in the drawings are provided to explain embodiments of the present application and not to limit the present application. In the drawings:

[0019] Figure 1 The overall assembly diagram of the tibial platform is shown.

[0020] Figure 2 The overall structure diagram of the pushing device is shown.

[0021] Figure 3 The overall sectional view of the tibial platform is shown.

[0022] Figure 4A connection diagram of the second upper support rod and the first connecting body is shown.

[0023] Figure 5 A tool structure diagram is shown.

[0024] Wherein, the above-mentioned drawings include the following reference signs: 1, tibial support; 10, third limiting device; 11, convex body; 2, base; 20, groove; 21, convex device; 3, pushing device; 30, extension rod; 300, groove; 31, worm; 310, thread; 32, turbine; 320, cylinder; 33, upper support body; 330, first upper support rod; 331, second upper support rod; 34, first connecting body; 340, connecting block; 35, lower support body; 350, first limiting device; 4, fixing device; 40, first spring; 41, fixed block; 42, reinforcing device; 43, second connecting body; 430, second limiting device; 431, upper connecting rod; 432, lower connecting rod; 5, clamping structure; 51, second spring; 52, hinge. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work under the premise, belong to the scope of protection of the present application.

[0026] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0028] like Figures 1-3 The following is illustrated: A tibial platform includes a tibial support 1, which is a hollow cylindrical structure with an open bottom, and three protrusions 11 are fixedly arranged on the outer surface of the hollow cylindrical structure; a base 2, on which a groove 20 is provided, extending into the interior of the tibial support; and a pushing device 3, which is disposed inside the tibial support 1 and includes: extension rods 30 disposed at both ends of a worm gear, a worm gear 31 with oppositely oriented threads 310 on the outer surfaces of both ends, and turbines 32 disposed on both sides of the worm gear, the turbine surfaces being gears that mesh with the worm gear threads, and the turbines passing through the cylinder 31. 20 forms a rotatable connection with the tibial support, and is set on the top of the turbine and connected to the fixing device 4 through the first connecting body 34. The upper support body includes a first support rod 330 and a second support rod 331. A lower support body 35 is set at the bottom of the turbine and forms a hinged connection with the fixing device 4. The fixing device 4 is a hollow cone with a first spring 40 inside. One end of the first spring is vertically movable and connected to the first connecting body 34, and the other end is connected to a fixing block 41. At the same time, a reinforcing device 42 is provided on the outer surface of the bottom of the fixing device to enhance the fixation. In use, the tibial plateau is implanted. First, the extension rod is clamped, and rotating the extension rod drives the worm gear to rotate. The rotation of the worm gear drives the meshing turbine to rotate, which in turn drives the upper support body to move upward. The upward movement of the upper support body drives the first connector to move upward. At the same time, the rotation of the turbine drives the lower support body to move downward. The downward movement of the lower support body pushes the entire fixation device downward. When the fixation device moves downward, it extends from the tibial support and inserts into the tibial medullary cavity. The upward movement of the first connector drives the first spring and fixation block inside the fixation device to move upward. This continues until the two support rods of the upper support body are aligned in a straight line. At this point, the first connector restricts the upper support body from moving upward further, and the lower support body no longer pushes the fixation device downward. The first connector drives the fixation block to extend from the fixation device and insert into the tibial medullary cavity. The triangular vertebral fixation block can enhance the stability in the medullary cavity. At the same time, the top of the fixation device fits perfectly with the bottom of the tibial support to form a whole, enhancing the overall rigidity of the tibial plateau.

[0029] As shown in Figure 1 The top of the base is provided with three convex devices 21, which can enhance the stability of the tibial pad and the overall stability of the knee prosthesis.

[0030] As shown in Figure 2 The middle part of the extension rod 30 is provided with a rectangular groove 300 on both sides, which is symmetrical and convenient for cooperation with the clamping structure 5.

[0031] As shown in Figure 3 The fixing device 3 is hingedly connected with the tibial support 1 through the second connecting body, which is hingedly connected with the second limiting device 430 and the third limiting device 10. After the overall downward movement of the fixing device is completed, the upper connecting rod 431 and the lower connecting rod 432 in the second connecting body are connected in a straight line, avoiding the weakening of the overall fixation effect caused by the biomechanical pushback of the fixing device during movement, and connecting the fixing device and the tibial support into a whole to enhance the overall tibial platform rigidity.

[0032] As shown in Figure 4 The first connecting body 34 is located at the left end of the second upper support rod 331, which can limit the continuous upward movement of the upper support body and limit the continuous activity of the entire pushing device during the movement process; at the same time, during the operation repair, the first connecting body can drive the first spring 40 and the fixing block 41 in the fixing device to retract during the downward movement of the first connecting body, which can effectively reduce the bone removal amount.

[0033] As shown in Figure 5 The upper part of the clamping structure 5 is connected through the second spring 51, and the middle part is connected through the hinge 52. The lower part is in a bent shape, and the lower end is a rectangular body matching the structure of the rectangular groove 300. The clamping structure 5 extends into the tibial support 1 from the groove 20 on the base 2, clamps the rectangular groove, pushes the extension rod to rotate, drives the entire device to move, and effectively improves the operation efficiency.

[0034] In order to further improve the stability of the prosthesis, the reinforcing device 42 in the shape of barb is arranged at the bottom of the fixing device to increase the overall stability; secondly, the porous structure is arranged on the surface of the fixing device to promote bone growth; at the same time, the nano coating is arranged on the surface of the tibial support to promote the growth of bone cells and enhance the stability of the prosthesis.

[0035] In the description of the application, it needs to be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0036] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0037] In addition, it needs to be pointed out that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore, it cannot be understood as a limitation on the scope of protection of the application.

[0038] The above only describes the preferred embodiments of the application and is not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A tibial piateau characterized by, The application relates to a tibial tray (1) which is a hollow cylindrical structure with an open bottom, the outer surface of the hollow cylindrical structure being fixedly provided with three convex bodies (11); a base (2) which is provided with grooves (20) penetrating into the inside of the tibial tray (1), the base being fixedly arranged on the tibial tray (1); a pushing device (3) arranged in the inside of the tibial tray, comprising: an extension rod (30) arranged at the two ends of a worm (31), the worm (31) being provided with threads (310) with opposite directions at the outer surfaces of the two ends, two side turbines (32) with gear surfaces being engaged with the worm threads (310), the turbine being rotatably connected with the tibial tray through a cylinder (320), an upper support body (33) arranged at the top of the turbine, the upper support body (33) comprising a first upper support rod (330) and a second upper support rod (331) which are connected through a hinge, wherein the second upper support rod (331) is vertically connected with a first connecting body (34), the upper support body being connected with a fixing device (4) through the first connecting body (34), a lower support body (35) arranged at the bottom of the turbine, the lower support body (35) being composed of support rods arranged symmetrically left and right, the lower support body (35) being hingedly connected with the fixing device (4) through a first limiting device (350), the fixing device (4) being a hollow cone, the fixing device being provided with a first spring (40) in the inside, one end of the first spring being movably connected with a connecting block (340), the other end of the first spring being connected with a fixing block (41), the bottom outer surface of the fixing device being provided with a reinforcing device (42). The base (2) is circular, the base being provided with three convex devices (21), the base being further provided with two rectangular grooves (20), the distance between the grooves being consistent with the length of the worm structure, and the surface of the tibial tray being sprayed with a nano coating. The extension rod (30) in the pushing device (3) is a cuboid, the middle part and the left and right sides of the extension rod being provided with two symmetric rectangular grooves (300). The connecting points of the upper support body (33) and the lower support body (35) on the turbine are located on the same diameter of the turbine and have a consistent distance from the center. The fixing device (4) further comprises a second connecting body (43), the second connecting body (43) being hingedly connected with the fixing device (4) through a second limiting device (430) and with the tibial tray (1) through a third limiting device (10). The top of the fixing device (4) is consistent with the size and shape of the circular opening structure at the bottom of the hollow cylinder of the tibial tray, the fixing block (41) connected with the first spring (40) being a triangular pyramid with a porous surface, and the reinforcing device (42) on the surface of the fixing device being a barb structure. ​ ​ ​ ​ 2. The tibial baseplate of claim 1 wherein, ​ 3. The tibial baseplate of claim 1 wherein, ​ 4. The tibial baseplate of claim 1 wherein, ​ 5. The tibial baseplate of claim 1 wherein, ​ 6. The tibial baseplate of claim 1 wherein, ​

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