A type of knee prosthesis

Abstract

The application relates to a knee joint prosthesis which comprises two connecting mechanisms, two transmission mechanisms and a supporting mechanism. The connecting mechanism is composed of a connecting rod, a connecting plate and a driving rod; the transmission mechanism is composed of a main body, a control plate, a connecting rod, an elastic structure and a limiting column, and the main body is composed of a track layer, a control groove, a matching hole, a sliding layer and a through hole; the supporting mechanism is composed of a coupling structure and a fixing structure; when the knee joint prosthesis works, the movement of the host femur drives the driving rod to move. When running to the set angle, the control plate is triggered to lift the limiting column, so that the sliding layer and the track layer are unlocked. At this time, the driving rod continues to move and drives the sliding layer to displace, realizing the layered movement of the femoral condyle. The scheme disperses the movement and load to the multi-layer interface to bear, reduces the friction times of a single interface, simultaneously replaces the traditional polyethylene gasket with a mechanical structure, and effectively avoids the abrasion of the polyethylene gasket in the long-term use process.

Description

Technical Field

[0001] This invention relates to a prosthesis, and more particularly to a knee joint prosthesis. Background Technology

[0002] Total knee arthroplasty (TKA) is the most effective treatment for end-stage knee disease, significantly relieving pain, restoring joint function, and improving patients' quality of life. However, with the accelerating global aging population, TKA is facing unprecedented clinical challenges: on the one hand, the number of surgeries continues to grow at a high rate, and on the other hand, the long-term revision rate has not decreased significantly with technological advancements. Multiple long-term follow-up studies and data from the National Joint Registry show that the median time to revision after TKA remains relatively short. Osteolysis induced by aseptic loosening and polyethylene wear has become the leading cause of long-term revision, accounting for a much higher proportion than other failure modes such as infection and malalignment. Insufficient long-term prosthesis durability has become a key bottleneck restricting the long-term efficacy of TKA and increasing the socioeconomic and patient burden.

[0003] Existing prostheses have inherent defects in their configuration and interface design, making it difficult to fundamentally avoid the aforementioned long-term failure problems. The core contradiction lies in the fact that the polyethylene gasket, as the load-bearing and sliding interface of the TKA standard, inevitably undergoes wear and fatigue failure under multiaxial alternating loads in vivo. The resulting submicron-sized abrasion debris is phagocytosed by macrophages in the surrounding tissues, activating a cascade release of osteolytic cytokines, which in turn triggers osteoclast activation and periprosthetic osteolysis, ultimately leading to aseptic loosening, prosthesis subsidence, and even revision failure. Even more challenging is that the polyethylene load-bearing interface is an inherent structural feature of TKA, which dictates that it will inevitably continue to generate abrasion debris during long-term use. Once the biological cascade of "abrasion debris—inflammation—osteolysis" is initiated, it cannot be fundamentally blocked by existing materials science methods, exhibiting both structural inevitability and clinical irreversibility.

[0004] In summary, the problems of polyethylene wear, osteolysis, and aseptic loosening encountered by traditional knee prostheses during long-term use greatly limit their long-term stability, and fundamental breakthroughs in prosthesis configuration and interface design are urgently needed. Summary of the Invention

[0005] The main purpose of this invention is to develop a knee joint prosthesis that solves the problem of insufficient stability caused by the wear of the polyethylene gasket in existing knee joint prostheses after long-term use.

[0006] To achieve the above objectives, the present invention provides a knee joint prosthesis, specifically comprising: two connecting mechanisms, two transmission mechanisms, and a support mechanism. The connecting mechanisms include: a connecting rod, a connecting plate, and a drive rod. The connecting rod is embedded in the host's autologous bone for connecting the prosthesis to the autologous bone. A connecting plate is disposed below the connecting rod for connecting the connecting rod and the drive rod. The drive rod is connected to the connecting plate at the top and contacts the top track layer at the bottom, for transmitting motion to the transmission mechanisms.

[0007] The transmission mechanism includes: a main body, a control plate, connecting rods, a spring structure, and limiting posts. The main body includes: track layers, control grooves, mating holes, sliding layers, and through holes. Multiple track layers are radially distributed within the main body, limiting the movement of the drive rod or sliding layer and guiding its direction of motion. Control grooves running radially through both sides of the track layers provide space for the control plate to rotate. Except for the top layer, each track layer has a mating hole in its middle section that engages with a corresponding limiting block to restrict the relative displacement between the sliding layer and the track layer. Multiple sliding layers are also radially distributed within the main body; the lower surface of the sliding layer contacts the upper surface of the track layer to trigger the control plate and drive the displacement of the structure below. A through hole in the middle section of the sliding layer allows the limiting posts to extend and retract. The control plate is connected to the control grooves via pins. When the drive rod or sliding layer triggers the control plate, the control plate rotates, driving the connecting rod mechanism to control the lifting of the limiting posts, allowing relative displacement between the sliding layer and the track layer. The limiting posts are connected to the control plate via connecting rods, allowing the control plate to control the raising and lowering of the limiting posts. The limiting post is connected to the track layer via an elastic structure. When the drive rod or sliding layer no longer triggers the control plate, the limiting post and control plate are reset. The support mechanism includes a coupling structure and a fixing structure. The coupling structure includes a base, guide grooves, constraint holes, and a stop plate. The base has two guide grooves, which are connected to the bottom sliding layer to limit the transmission mechanism and guide its movement. A constraint hole is provided in the middle of the guide groove to limit the relative displacement of the transmission mechanism and the support mechanism together with the limiting post. The upper part of the stop plate is connected to the base to connect the base and the lower fixing structure. The fixing structure includes a stop groove and a fixing rod. The stop plate is embedded in the stop groove to connect the coupling structure and the fixing structure. The upper part of the fixing rod is connected to the stop groove, and the lower part of the fixing rod is embedded in the host autologous bone to fix the support mechanism.

[0008] Furthermore, the main body also includes a sealing layer, the upper surface of which is tightly fitted with the lower surface of the connecting mechanism to prevent metal ion leakage, protect the internal structure, and extend service life.

[0009] Furthermore, the sliding layer has a trapezoidal cross-section, with the top width being smaller than the bottom width; the guide groove has a trapezoidal cross-section that matches the shape of the sliding layer's cross-section, with the width of the opening end being smaller than the width of the bottom end. This prevents the sliding layer from detaching from the guide groove during prosthesis operation, improving operational stability.

[0010] Furthermore, multiple rollers are provided on one side of the control board to prevent jamming after the drive rod or sliding layer stops triggering, which would prevent the control board and limit post from resetting.

[0011] Furthermore, the support mechanism also includes a flexible structure, one end of which is connected to the stop plate and the other end to the stop groove, which provides the knee joint with a small range of motion in multiple directions and can also buffer stress.

[0012] Furthermore, the fixing structure also includes multiple fixing plates, which are connected to the stop groove on the top and to the fixing rod on the side, to increase the connection stability of the support mechanism and prevent the support mechanism from rotating.

[0013] According to the technical solution of this invention, a knee joint prosthesis includes a connecting mechanism, a transmission mechanism, and a support mechanism. The connecting mechanism includes a connecting rod, a connecting plate, and a drive rod. The connecting rod is embedded in the host's autologous bone to connect the prosthesis to the autologous bone. A connecting plate is provided below the connecting rod to connect the connecting rod and the drive rod. The drive rod is connected to the connecting plate at the top and contacts the top track layer at the bottom, transmitting motion to the transmission mechanism. The transmission mechanism includes a main body, a control plate, a connecting rod, an elastic structure, and limiting posts. The main body includes a track layer, a control groove, a mating hole, a sliding layer, and a through hole. Multiple track layers are radially distributed within the main body, limiting the drive rod or sliding layer and guiding its movement. Radial through control grooves are provided on both sides of the track layer to provide space for the control plate to rotate. Except for the top layer, each track layer has a mating hole in its middle section that engages with a corresponding limiting block to jointly restrict the relative displacement between the sliding layer and the track layer. The main body also has multiple sliding layers radially distributed. The lower surface of the sliding layer contacts the upper surface of the track layer to trigger the control plate and drive the displacement of the structure below. A through hole is provided in the middle section of the sliding layer for the extension and retraction of the limiting post. The control plate and control groove are connected by a pin. When the drive rod or sliding layer triggers the control plate, the control plate rotates, driving the linkage mechanism to control the lifting of the limiting post, allowing relative displacement between the sliding layer and the track layer. The limiting post is connected to the control plate via a linkage, allowing the control plate to control the raising and lowering of the limiting post. The limiting post is connected to the track layer via an elastic structure. When the drive rod or sliding layer no longer triggers the control plate, the limiting post and control plate reset. The support mechanism includes a coupling structure and a fixing structure. The coupling structure includes a base, guide grooves, constraint holes, and a stop plate. The base has two guide grooves, each connected to the bottom sliding layer, used to limit the transmission mechanism and guide its movement direction. A constraint hole is provided in the middle section of the guide groove, used together with the limiting post to restrict the relative displacement between the transmission mechanism and the support mechanism. The upper part of the stop plate connects to the base body, serving to connect the base body and the lower fixing structure. The fixing structure includes a stop groove and a fixing rod. The stop plate is embedded in the stop groove, serving to connect the coupling structure and the fixing structure. The upper part of the fixing rod connects to the stop groove, and the lower part of the fixing rod is embedded in the host autologous bone, serving to fix the support mechanism. Utilizing the cooperation of a multi-layer nested mechanism and limiting posts, a graded triggering and layered movement mode is achieved while ensuring the flexion and extension angles of the knee joint prosthesis. This scheme distributes movement and load across multiple interfaces, reducing the number of friction cycles at a single interface; simultaneously, it uses a mechanical structure to replace the traditional polyethylene gasket, effectively avoiding wear and tear on the polyethylene gasket during long-term use. This invention, through its layered movement, multi-interface load distribution, and mechanical structure replacement technical solutions, eliminates the traditional polyethylene gasket component, fundamentally solving problems such as aseptic loosening caused by gasket friction after long-term use of the knee joint prosthesis, and improving the long-term stability and service life of the prosthesis. Attached Figure Description

[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 An exploded view of a knee joint prosthesis is shown; Figure 2 A cross-sectional view of the connecting mechanism and the transmission mechanism is shown; Figure 3 A cross-sectional view of the transmission mechanism is shown; Figure 4 A sectional view of the main body is shown; Figure 5 An exploded view of the internal structure of the transmission mechanism is shown; Figure 6 The top view and sectional view of the support mechanism are shown; Figure 7 Cross-sectional views and enlarged views of the coupling structure and sliding layer are shown; The above-mentioned figures include the following reference numerals: 10, connecting mechanism; 101, connecting rod; 102, connecting plate; 103, driving rod; 20, transmission mechanism; 201, main body; 2011, track layer; 2012, control groove; 2013, mating hole; 2014, sliding layer; 2015, through hole; 2016, sealing layer; 202, control plate; 203, connecting rod; 204, elastic structure; 205, limiting post; 30, support mechanism; 301, coupling structure; 3011, base; 3012, guide groove; 3013, constraint hole; 3014, stop plate; 302, flexible structure; 303, fixed structure; 3031, stop groove; 3032, fixed rod; 3033, fixed plate. Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0016] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0017] 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 drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0018] like Figure 1-7 As shown, a knee joint prosthesis specifically includes: a connecting mechanism 10, a transmission mechanism 20, and a support mechanism 30.

[0019] The connecting mechanism 10 includes a connecting rod 101, a connecting plate 102, and a drive rod 103. The connecting rod 101 is embedded in the host's autologous bone to connect the prosthesis to the autologous bone. The connecting plate 102 is disposed below the connecting rod 101 to connect the connecting rod 101 and the drive rod 103. The drive rod 103 is connected to the connecting plate 102 at the top and contacts the top track layer 2011 at the bottom, for transmitting motion to the transmission mechanism 20.

[0020] The transmission mechanism 20 includes: a main body 201, a control plate 202, a connecting rod 203, a spring structure 204, and a limiting post 205. The main body 201 includes: a track layer 2011, a control groove 2012, a mating hole 2013, a sliding layer 2014, and a through hole 2015. Multiple track layers 2011 are radially distributed within the main body 201, limiting the movement of the drive rod 103 or the sliding layer 2014 and guiding their direction of movement. Control grooves 2012, extending radially through both sides of the track layers 2011, provide space for the rotation of the control plate 202. Except for the top layer, each track layer 2011 has a mating hole 2013 in its middle section, which engages with the corresponding limiting post 205 to jointly limit the relative displacement between the sliding layer 2014 and the track layer 2011. The main body 201 also has multiple sliding layers 2014 distributed radially. The lower surface of the sliding layer 2014 contacts the upper surface of the track layer 2011 to trigger the control plate 202 and drive the displacement of the structure below. A through hole 2015 is provided in the middle section of the sliding layer 2014 to allow the extension and retraction of the limiting post 205. The cross-section of the sliding layer 2014 is trapezoidal, and the width of the top of the sliding layer 2014 is smaller than the width of its bottom; this ensures that the sliding layer 2014 cannot detach from the guide groove 3012 during the operation of the prosthesis, improving operational stability. The main body 201 also includes a sealing layer 2016, the upper surface of which is tightly fitted with the lower surface of the connecting mechanism 10 to prevent metal ion leakage, protect the internal structure, and extend service life. The control plate 202 is connected to the control groove 2012 via a pin. When the drive rod 103 or the sliding layer 2014 triggers the control plate 202, the control plate 202 rotates, driving the connecting rod 203 mechanism to control the lifting of the limit post 205, allowing relative displacement between the sliding layer 2014 and the track layer 2011. Multiple rollers are also provided on one side of the control plate 202 to prevent jamming after the drive rod 103 or the sliding layer 2014 stops triggering, which would prevent the control plate 202 and the limit post 205 from resetting. The limit post 205 is connected to the control plate 202 via the connecting rod 203, allowing the control plate 202 to control the raising and lowering of the limit post 205. The limit post 205 is connected to the track layer 2011 via a spring structure 204. When the drive rod 103 or the sliding layer 2014 no longer triggers the control plate 202, the spring structure 204 controls the limit post 205 and the control plate 202 to reset.

[0021] The support mechanism 30 includes a coupling structure 301 and a fixing structure 303. The coupling structure 301 includes a base 3011, guide grooves 3012, constraint holes 3013, and a stop plate 3014. The base 3011 has two guide grooves 3012, which are connected to the bottom sliding layer 2014 to limit the movement of the transmission mechanism 20 and guide its direction of motion. The cross-section of the guide grooves 3012 is trapezoidal, matching the cross-sectional shape of the sliding layer 2014, ensuring that the sliding layer 2014 cannot detach from the guide grooves 3012 during the operation of the prosthesis, thus improving operational stability. A constraint hole 3013 is provided in the middle section of the guide groove 3012, which, together with the limiting post 205, restricts the relative displacement between the transmission mechanism 20 and the support mechanism 30. The upper part of the stop plate 3014 is connected to the base 3011, connecting the base 3011 and the lower fixing structure 303. The fixing structure 303 includes a stop groove 3031 and a fixing rod 3032. A stop plate 3014 is embedded in the stop groove 3031 for connecting the coupling structure 301 and the fixing structure 303. The fixing rod 3032 is connected to the stop groove 3031 at the top and embedded in the host autologous bone at the bottom for fixing the support mechanism 30. The fixing structure 303 also includes multiple fixing plates 3033, which are connected to the stop groove 3031 at the top and to the fixing rod 3032 at the side, for increasing the connection stability of the support mechanism 30 and preventing rotation of the support mechanism 30. The support mechanism 30 also includes a flexible structure 302, one end of which is connected to the stop plate 3014 and the other end to the stop groove 3031. This provides the knee prosthesis with a small range of motion in multiple directions and also buffers stress.

[0022] like Figure 1-5 As shown, the lower surface of the connecting plate 102 is tightly connected to the sealing layer 2016 to prevent metal ion leakage, protect the internal structure, and extend service life. When the host femur moves, it drives the connecting mechanism 10, and the driving rod 103 moves along the track of the top track layer 2011. At this time, the displacement of the top sliding layer 2014 is restricted because the limiting post 205 in the through hole of the top sliding layer 2014 interacts with the mating hole 2013 of the next track layer 2011. As the amplitude of femoral movement increases, the driving rod 103 contacts the control plate 202 and presses it down. The control plate 202 presses down and drives the limiting post 205 to rise, unlocking the top sliding layer 2014 so that it can move along its lower track layer 2011. When the amplitude increases again to a preset angle, the top sliding layer 2014 presses down the control plate 202 on its corresponding track layer 2011, unlocking the next sliding layer 2014, and so on. The present invention can control the performance by adding or removing the corresponding track layer 2011 and sliding layer 2014.

[0023] like Figure 1-5As shown, multiple rollers 2021 are provided on the upper side of the control plate 202. When the drive rod 103 or the sliding layer 2014 moves away from the state of triggering the control plate 202, it can effectively prevent the drive rod 103 or the sliding layer 2014 from jamming with the control plate 202. When the drive rod 103 or the sliding layer 2014 no longer presses down on the control plate 202, the rebound force of the elastic structure 204 will cause the limit post 205 to drop, thereby driving the control plate 202 to reset.

[0024] like Figure 2-7 As shown, the support mechanism 30 includes a coupling structure 301 and a fixing structure 303. The coupling structure 301 includes a base 3011, guide grooves 3012, constraint holes 3013, and a stop plate 3014. The base 3011 is provided with two guide grooves 3012, which are respectively connected to the bottom sliding layer 2014 to limit the transmission mechanism 20 and guide its movement direction. The cross-section of the guide groove 3012 is a trapezoid that matches the cross-sectional shape of the sliding layer 2014, ensuring that the sliding layer 2014 cannot detach from the guide groove 3012 during the operation of the prosthesis, thus improving operational stability. A constraint hole 3013 is provided in the middle section of the guide groove 3012 to limit the relative displacement of the transmission mechanism 20 and the support mechanism 30 together with the limiting post 205. The upper part of the stop plate 3014 is connected to the base 3011 to connect the base 3011 and the lower fixing structure 303. The fixing structure 303 includes a stop groove 3031 and a fixing rod 3032. A stop plate 3014 is embedded in the stop groove 3031 for connecting the coupling structure 301 and the fixing structure 303. The fixing rod 3032 is connected to the stop groove 3031 at the top and embedded in the host autologous bone at the bottom for fixing the support mechanism 30. The fixing structure 303 also includes multiple fixing plates 3033, which are connected to the stop groove 3031 at the top and to the fixing rod 3032 at the side, for increasing the connection stability of the support mechanism 30 and preventing rotation of the support mechanism 30. The support mechanism 30 also includes a flexible structure 302, one end of which is connected to the stop plate 3014 and the other end to the stop groove 3031. This provides the knee prosthesis with a small range of motion in multiple directions and also buffers stress.

[0025] When using this invention, the specific technical effects of the embodiments are as follows: The connecting mechanism is connected to the autologous bone. When the host femur moves, it drives the internal drive rod to move along a preset track. When it moves to a set angle, it triggers the control plate to lift the limiting column, completing the unlocking between the sliding layer and the track layer. At this time, the drive rod continues to move, driving the sliding layer to displace, and sequentially completing the multi-layer unlocking to realize the layered movement of the femoral condyle. The coupling structure and the fixing structure are connected by a flexible structure. During the movement, compressing the flexible structure allows the prosthesis to have multi-directional small-range mobility, ensuring the flexibility of the knee joint.

[0026] In summary, this invention utilizes a multi-layered nested mechanism in conjunction with limiting posts to achieve a graded triggering and layered motion mode while ensuring the flexion and extension angles of the knee joint prosthesis. This scheme distributes motion and load across multiple interfaces, reducing the number of friction events at a single interface; simultaneously, by using a mechanical structure to replace the traditional polyethylene gasket, wear and tear on the polyethylene gasket during long-term use is effectively avoided. This achieves the goal of improving the long-term stability of the knee joint prosthesis.

[0027] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0028] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0029] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A knee joint prosthesis, characterized in that, include: The connecting mechanism (10) includes: a connecting rod (101) embedded in the host autologous bone, and a connecting plate (102) provided below the connecting rod (101); and a driving rod (103) whose upper end is connected to the connecting plate (102). A transmission mechanism (20) includes: a main body (201), which includes multiple radially distributed track layers (2011), each track layer (2011) having a radially penetrating control groove (2012) symmetrically arranged on both sides, and each track layer (2011) except the top layer having a mating hole (2013) in the middle section; and multiple radially distributed sliding layers (2014), the sliding layers (2014) having a lower table below. The sliding layer (2014) is in contact with the upper surface of the track layer (2011), and a through hole (2015) is provided in the middle section of the sliding layer (2014); control plate (202), the control plate (202) and the control groove (2012) are connected by a pin; limit post (205), the limit post (205) is connected to the control plate (202) through a connecting rod (203), and the limit post (205) is connected to the track layer (2011) through an elastic structure (204); The support mechanism (30) includes: a coupling structure (301), which includes: a base (3011), on which two guide grooves (3012) are opened, and a constraint hole (3013) is provided in the middle section of the guide groove (3012), and a stop plate (3014) is provided below the base (3011); and a fixing structure (303), which includes: a stop groove (3031), in which a stop plate (3014) is embedded, and a fixing rod (3032) is provided below the stop groove (3031).

2. The knee joint prosthesis according to claim 1, wherein the main body (201) further includes a sealing layer (2016), the upper surface of the sealing layer (2016) being tightly fitted with the lower surface of the connecting plate (102) to prevent metal ion leakage, protect the internal structure, and extend service life.

3. The knee joint prosthesis according to claim 1, wherein the cross-section of the sliding layer (2014) is trapezoidal, and the width of the top of the sliding layer (2014) is smaller than the width of its bottom; the cross-section of the guide groove (3012) is a trapezoidal shape adapted to the cross-sectional shape of the sliding layer (2014), and the width of the opening end of the guide groove (3012) is smaller than the width of the bottom end; used to prevent the sliding layer (2014) from falling out of the guide groove (3012) during movement.

4. In the knee joint prosthesis according to claim 1, a plurality of rollers (2021) are provided on one side of the control plate (202), the rollers being used to prevent jamming after the drive rod or sliding layer stops triggering, which would prevent the control plate and the limiting post from resetting.

5. The knee joint prosthesis according to claim 1, wherein the support mechanism (30) further comprises a flexible structure (302), one end of the flexible structure (302) is connected to a stop plate (3014), and the other end of the flexible structure (302) is connected to a stop groove (3031). The flexible structure is used to provide the knee joint prosthesis with small range of motion in multiple directions, and can also buffer stress.

6. The knee joint prosthesis according to claim 1, wherein the fixing structure (303) further includes a plurality of fixing plates (3033), the upper part of the fixing plate (3033) is connected to the stop groove (3031), and the side of the fixing plate (3033) is connected to the fixing rod (3032) to increase the connection stability of the support mechanism (30) and prevent the support mechanism (30) from rotating.

Images