A knee prosthesis system

Abstract

The present application relates to a kind of knee joint prosthesis systems, including quick release module, single-sided condyle, single-sided platform, matching condyle and matching platform.Clinical use, such as patient meets single condyle replacement indication, can be assembled into single condyle prosthesis by quick release module, single-sided condyle and single-sided platform;If single condyle prosthesis is implanted and the condition progresses, total knee replacement is carried out, then matching condyle and matching platform are added, i.e.total knee joint prosthesis can be revised without disassembling original single condyle prosthesis.The present application realizes in situ expansion of single condyle prosthesis to total knee prosthesis by modular design, without removing original prosthesis, effectively overcome the defects such as large trauma, more bone loss, revision difficulty when single condyle is upgraded to total knee in prior art.

Description

Technical Field

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

[0002] The knee joint is one of the largest and most complex joints in the human body, bearing the main weight-bearing and flexion-extension functions. Knee joint diseases (such as osteoarthritis, rheumatoid arthritis, traumatic arthritis, and joint damage caused by trauma or tumors) seriously affect patients' quality of life, are difficult to treat clinically, and have a high disability rate. According to incomplete statistics, the prevalence of knee osteoarthritis in people over 60 years of age in my country has exceeded 50%, and is showing an increasing trend year by year.

[0003] Depending on the extent of the lesion and the surgical approach, total knee replacement is mainly divided into two categories: unicompartmental knee arthroplasty and total knee arthroplasty. Unicompartmental knee arthroplasty only replaces the surface of the affected compartment of the knee joint, which has advantages such as minimal trauma, greater bone preservation, faster postoperative recovery, and better proprioception. It is suitable for patients whose lesions are limited to a single compartment and whose ligament function is intact. Total knee arthroplasty, on the other hand, replaces the entire knee joint and is suitable for patients with multicompartmental lesions or impaired ligament function. However, it involves greater surgical trauma, larger bone resection, and is more difficult to revise.

[0004] However, in clinical practice, the following two situations often occur: 1. After a patient undergoes unicompartmental knee arthroplasty for the first time, as age increases, the disease progresses, or secondary degeneration occurs in the contralateral compartment, the patient eventually needs to undergo total knee arthroplasty; 2. Some patients need staged reconstruction due to trauma or tumors, and undergo unicompartmental knee arthroplasty first, and then expand to total knee arthroplasty later.

[0005] However, existing unicompartmental and total knee replacements are structurally independent, and once implanted, they cannot be expanded or upgraded in situ. If a unicompartmental knee replacement needs to be upgraded to a total knee replacement, clinicians must first remove the entire implanted unicompartmental prosthesis and then re-implant a total knee prosthesis. This process involves significant surgical trauma, severe bone loss, and a long operation time.

[0006] Therefore, there is an urgent clinical need for a knee prosthesis system that can be quickly assembled and disassembled and is easy to upgrade. Summary of the Invention

[0007] The main objective of this invention is to provide a knee joint prosthesis system that is quick to assemble and disassemble and easy to upgrade, in order to solve the problems of large surgical trauma, severe bone loss, and long operation time when upgrading from unicompartmental knee arthroplasty to total knee arthroplasty. To achieve the above objective, This invention provides a knee joint prosthesis system, specifically comprising: a quick-release module, a unilateral condyle, and a unilateral platform.

[0008] The quick-release module includes: a fixing block, a washer, a connecting block, and a limiting block. The fixing block, together with the connecting block, locks the washer in place. A washer is located below the fixing block; this washer supports the movement of the femoral condyle and has fixing holes to accommodate the connecting block and, together with the fixing block, restrict the washer's displacement. A limiting block is fixedly located below the connecting block. This limiting block engages with a limiting groove in the unilateral platform to prevent the quick-release module from dislodging.

[0009] The unilateral condyle includes an implant key. This key is fixedly connected to the host bone and used to secure the knee prosthesis system and the patient's own bone.

[0010] The unilateral platform includes a positioning groove and an implant key. The positioning groove cooperates with a positioning block to fix the position of the knee prosthesis system. The implant key connects to the host bone to fix the knee prosthesis system and the patient's own bone.

[0011] Furthermore, one end of the limiting block is provided with a through hole for accommodating the control rod. The quick-release module also includes: a control rod, a positioning block, and a spring device. The control rod is movably disposed in the through hole of the limiting block and is used to control the movement of the positioning block to achieve locking and unlocking. The positioning block is located below the control rod and is provided with a track to drive the positioning block to rise when the control rod moves, thereby unlocking. The positioning block is provided with a stepped structure to prevent the positioning block from disengaging from the limiting block. One end of the spring device is connected to the control rod, and the other end is connected to the limiting block, used to drive the positioning block and the control rod to reset, thereby locking.

[0012] Furthermore, the single-sided platform also includes a positioning groove, which is located below the limiting groove and abuts against the positioning block, to further restrict the position of the knee joint prosthesis system and prevent it from slipping off.

[0013] Furthermore, the unilateral condyle is also provided with a mating groove. The knee prosthesis system also includes: a mating condyle and a mating platform. The mating condyle is provided with a mating key and an implantation key, the mating key connecting with the mating groove key to upgrade the unicompartmental knee prosthesis to a total knee prosthesis. The mating platform also includes: a limiting groove, a positioning groove, and a tibial stem. The limiting groove mates with a limiting block to prevent the quick-release mechanism from dislodging. The positioning groove is located below the limiting groove and abuts against the positioning block to lock the knee prosthesis system. The tibial stem contacts the host bone for stress transmission.

[0014] Furthermore, the implanted link is a trabecular bone structure with a hydroxyapatite coating on its surface, which enhances the bone ingrowth performance of the prosthesis and improves its long-term stability.

[0015] According to the technical solution of this invention, a knee joint prosthesis system specifically includes: a quick-release module, a unilateral condyle, and a unilateral platform. The quick-release module includes: a fixation block, a spacer, a connecting block, and a limiting block. The fixation block, together with the connecting block, locks the position of the spacer. A spacer is disposed below the fixation block, supporting the movement of the femoral condyle. The spacer has a fixation hole for accommodating the connecting block and, together with the fixation block, restricting the displacement of the spacer. A limiting block is fixedly disposed below the connecting block. The limiting block cooperates with a limiting groove in the unilateral platform to prevent dislocation of the quick-release module. The unilateral condyle includes: an implant key. The implant key is fixedly connected to the host bone for fixing the knee joint prosthesis system and the patient's autologous bone. The unilateral platform includes: a limiting groove and an implant key. The limiting groove cooperates with the limiting block for fixing the position of the knee joint prosthesis system. The implant key is connected to the host bone for fixing the knee joint prosthesis system and the patient's autologous bone. In clinical use, if the patient's condition is mild, a unicompartment and unicompartment platform are assembled to form a unicompartmental prosthesis. When the knee condition of a patient using a unicompartmental knee prosthesis further spreads and requires total knee replacement, a matching condyle and matching platform are added, allowing the unicompartmental knee prosthesis to be revised into a total knee prosthesis without the need to remove the original unicompartmental prosthesis.

[0016] This invention effectively solves the problems of large surgical trauma, severe bone loss, and long operation time when upgrading from unicompartmental knee replacement to total knee replacement by modularizing traditional knee joint prostheses. Attached Figure Description

[0017] 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 The isometric view, exploded view, and sectional view of the quick-release module are shown; Figure 2 An exploded view of the knee prosthesis system in unicompartmental use is shown. Figure 3 The front view and sectional view of a single-sided platform are shown; Figure 4 An exploded view of the knee prosthesis system in full knee use is shown; Figure 5 A schematic diagram of the assembly of a unilateral condyle and a mating condyle is shown; Figure 6 The front view and sectional view of the mating platform are shown; The above-mentioned figures include the following reference numerals: 10, quick-release module; 101, fixing block; 102, gasket; 1021, fixing hole; 103, connecting block; 104, limiting block; 105, control rod; 106, positioning block; 1061, track; 107, elastic device; 20, unilateral condyle; 201, mating groove; 202, implantation key; 30, unilateral platform; 301, limiting groove; 302, positioning groove; 303, conduction groove; 40, mating condyle; 401, mating key; 50, mating platform; 501, conduction plate; 502, flexible device; 503, tibial stem. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] like Figure 1As shown, the quick-release module 10 includes: a fixing block 101, a gasket 102, a connecting block 103, a limiting block 104, a control rod 105, a positioning block 106, and an elastic device 107. The fixing block 101, together with the connecting block 103, locks the position of the gasket 102. The gasket 102 is located below the fixing block 101, supporting the movement of the femoral condyle. A fixing hole 1021 is provided on the gasket 102, accommodating the connecting block 103 and, together with the fixing block 101, restricting the displacement of the gasket 102. A limiting block 104 is fixedly located below the connecting block 103, with a through hole at one end for accommodating the control rod 105. The control rod 105 is movably disposed within the through hole of the limiting block 104, controlling the movement of the positioning block 106 to achieve locking and unlocking. The positioning block 106 is located below the control lever 105. A track 1061 is provided on the positioning block 106 to lift the positioning block 106 when the control lever 105 moves, thus unlocking the mechanism. The positioning block 106 has a stepped structure to prevent it from disengaging from the limiting block 104. One end of the elastic device 107 is connected to the control lever 105, and the other end is connected to the limiting block 104. It is used to reset the control lever 105 and the positioning block 106, thus locking them in place.

[0022] like Figure 1-3 As shown, a knee joint prosthesis system includes: a quick-release module 10, a unilateral condyle 20, and a unilateral platform 30. The unilateral condyle 20 is connected to a spacer 102 in the quick-release module 10. The unilateral condyle 20 includes: a mating groove 201 and an implant key 202. The mating groove 201 is used to extend the unilateral condyle 20 into a full knee condyle. The implant key 202 is fixedly connected to the host bone for fixing the knee joint prosthesis system and the patient's autologous bone. The implant key 202 is designed with a porous structure to enhance bone ingrowth performance and improve the long-term stability of the prosthesis. The unilateral platform 30 includes: a limiting groove 301, a positioning groove 302, a conduction groove 303, and the implant key 202. The limiting groove 301 cooperates with a limiting block 104 to fix the position of the knee joint prosthesis system. The positioning groove 302 is located below the limiting groove 301 and abuts against the positioning block 106 to further restrict the position of the knee joint prosthesis system and prevent it from slipping out. The implant key 202 is connected to the host bone to fix the knee joint prosthesis system and the patient's own bone.

[0023] like Figure 1-5As shown, the knee prosthesis system, when in total knee use, also includes: a mating condyle 40 and a mating platform 50. The mating condyle 40 is equipped with a mating key 401 and an implantation key 202. The mating key 401 connects to the mating groove 201, upgrading a unicompartmental knee prosthesis to a total knee prosthesis. The mating platform 50 includes: a limiting groove 301, a positioning groove 302, and a tibial stem 503. The limiting groove 301 mates with a limiting block 104; the positioning groove 302 is located below the limiting groove 301 and abuts against the positioning block 106, used to lock the quick-release module 10. The tibial stem 503 contacts the host bone for stress transmission.

[0024] like Figure 3 , Figure 6 As shown, the single-sided platform 30 also includes a transmission groove 303. The transmission groove 303 is located below the positioning groove 302 and is keyway connected to the transmission plate 501 for stress transmission. The mating platform 50 also includes a transmission plate 501 and a flexible device 502. The transmission plate 501 is located below the positioning groove 302 and is used to connect with the transmission groove 303 for stress transmission. One end of the flexible device 502 is in contact with the mating platform 50, and the other end is fixedly connected to the transmission plate 501, used to push the transmission plate 501 into the transmission groove 303.

[0025] The specific technical effects of using this invention are as follows: For patients with relatively localized lesions, mild and manageable conditions, or older patients with lower activity needs, unicompartmental knee arthroplasty is often the preferred clinical choice. When these patients experience disease progression and require total knee replacement, the modular prosthesis design can convert the original unicompartmental prosthesis into a total knee prosthesis by replacing or adding components. Since this method does not require complete removal of the original prosthesis and extensive reconstruction, it reduces tissue stripping and bone resection, thus offering advantages such as less bleeding, shorter operation time, less trauma, and faster recovery. This provides a more efficient revision option for cases of unicompartmental knee arthroplasty progression.

[0026] In summary, this invention, through modular component design, can extend a unicompartmental knee prosthesis in situ into a total knee prosthesis, thereby effectively solving the problems of large surgical trauma, severe bone loss, long operation time, and difficulty in revision when upgrading from unicompartmental knee replacement to total knee replacement in the prior art.

[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 system, characterized in that, include: The quick-release module (10) includes: a fixing block (101), a gasket (102) is provided below the fixing block, a fixing hole (1021) is provided on the gasket, and a connecting block (103) is provided in the fixing hole (1021); and a limiting block (104), which is fixedly provided below the connecting block (103). A unilateral condyle (20) is in contact with a spacer (102), and an implantation key (202) is provided on the unilateral condyle (20), which is fixedly connected to the host bone; A single-sided platform (30) includes: a limiting groove (301) that cooperates with a limiting block (104) on a quick-release module (10); and an implant key (202) that is connected to the host bone.

2. The knee joint prosthesis system according to claim 1, characterized in that, The limiting block (104) is also provided with a through hole at one end; the quick-release module (10) further includes: a control rod (105), which is movably disposed in the through hole of the limiting block (104); a positioning block (106), which is located below the control rod (105), and a track (1061) is fixedly disposed on the positioning block (106), and a step structure is disposed on the positioning block (106); and an elastic device (107), one end of which is connected to the control rod (105), and the other end of which is connected to the limiting block (104).

3. The knee joint prosthesis system according to claim 2, characterized in that, The single-sided platform (30) further includes a positioning groove (302), which is located below the limiting groove (301) and abuts against the positioning block (106).

4. The knee joint prosthesis system according to claim 3, characterized in that, The unilateral condyle (20) is also provided with a mating groove (201); the knee joint prosthesis system also includes: a mating condyle (40), on which a mating key (401) and an implantation key (202) are provided, the mating key (401) being connected to the mating groove (201). A mating platform (50), the mating platform (50) also includes: a limiting groove (301), the limiting groove (301) mating with a limiting block (104); a positioning groove (302), the positioning groove (302) being located below the limiting groove (301), the positioning groove (302) abutting against the positioning block (106); and a tibial stem (503), the tibial stem (503) being connected to the host bone.

5. The knee joint prosthesis system according to claim 4, characterized in that, The single-sided platform (30) is also provided with a transmission groove (303); the mating platform (50) further includes: a transmission plate (501), which is connected to the transmission groove (303); and a flexible device (502), one end of which is in contact with the mating platform (50) and the other end is fixedly connected to the transmission plate (501).

6. The knee joint prosthesis system according to any one of claims 1 to 5, characterized in that, The implantable key (202) is a bone-like trabecular structure, and the surface of the implantable key (202) has a hydroxyapatite coating.

Images