Limiting movable unicondylar prosthesis assembly

Abstract

The present disclosure relates to the field of medical device technology, and in particular, to a limiting movable unicondylar prosthesis assembly. The limiting movable unicondylar prosthesis assembly comprises a limiting tibial plateau and a limiting tibial plateau pad. The limiting tibial plateau pad is mounted above the limiting tibial plateau. A limiting protrusion is arranged at an edge position of the limiting tibial plateau. A limiting groove is arranged at a position of the edge of the limiting tibial plateau pad corresponding to the limiting protrusion. The limiting groove and the limiting protrusion are matched to achieve the limiting of the limiting tibial plateau pad. A limiting recess is arranged on the upper surface of the limiting tibial plateau pad. On the premise that normal surgical procedures and the normal movement range of the prosthesis after the surgery are not affected, the present disclosure can avoid clinical complications of the anterior dislocation of the limiting tibial plateau pad caused by the impact of residual foreign substances such as osteophyte, bone cement, or the like on the limiting tibial plateau pad in the knee joint deep flexion process. In addition, clinical complications of the posterior dislocation of the tibial plateau pad caused by the rotation of the tibial plateau pad due to poor prosthesis positioning are avoided.

Description

A constrained mobile unicompartmental prosthesis assembly

[0001] Cross Reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202410439481.X, filed on April 12, 2024, entitled "A constrained mobile unicompartmental prosthesis assembly", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure belongs to the technical field of medical devices, and in particular, relates to a constrained mobile unicompartmental prosthesis assembly. BACKGROUND

[0004] Unicondylar knee arthroplasty (UKA) is a method for treating single compartment knee joint disease, which provides more physiological knee kinematics, higher range of motion, and more natural knee perception.

[0005] At present, mobile unicompartmental arthroplasty is widely used in clinical practice, and its clinical results are also quite excellent. However, literature reports that liner dislocation is one of the main reasons for the failure of mobile unicompartmental arthroplasty, and the incidence is higher in Asian populations (kneeling and deep squatting), which is more than three times that of Western populations. Common dislocations include anterior dislocation, posterior dislocation, and lateral dislocation. When the anterior and posterior dislocations occur, the liner completely exits the joint space, while in lateral dislocation, the liner remains in the joint space. Therefore, the symptoms of anterior and posterior dislocation are often more severe, and the liner needs to be reset or replaced.

[0006] Patent CN113995559A discloses a unicompartmental knee joint prosthesis, which comprises a femoral condyle, a tibial pad, and a tibial support. The femoral condyle is arranged on the tibial pad and can rotate relative to the tibial pad. The tibial pad and the tibial support are connected by a sliding device. The sliding device comprises a dovetail groove arranged on the bottom surface of the tibial pad and a sliding groove arranged on the top surface of the tibial support. The bottom surface of the tibial pad contacts the top surface of the tibial support, and the dovetail groove can slide in the sliding groove. It can be seen that the patent achieves the effect of preventing liner dislocation by setting dovetail grooves that cooperate with each other on the lower surface of the tibial platform pad and the upper surface of the tibial platform. However, this design has the following problems in clinical application: the upper surface of the tibial platform is slotted, which reduces the fatigue performance of the tibial platform. The lower surface of the tibial platform pad is provided with a dovetail protrusion, which increases the difficulty of installation during surgery or may cause the inability to install during surgery.

[0007] Patent CN209713267U discloses a single condyle knee joint prosthesis, which comprises a tibial platform prosthesis assembly, a femoral condyle prosthesis and a limiting assembly. The tibial platform assembly comprises a tibial connecting part and a supporting part arranged on the tibial connecting part. The femoral condyle prosthesis is arranged on the supporting part, and the surface of the supporting part towards the femoral condyle prosthesis has an arc-shaped sliding groove matched with the femoral condyle prosthesis. The limiting assembly is arranged on the tibial connecting part, and the limiting assembly comprises a plurality of limiting structures. At least two limiting structures are respectively located on the front and rear sides of the supporting part to limit and stop the supporting part. At least one of the at least two limiting structures is detachably connected with the tibial connecting part. It can be seen that the patent avoids the problem of liner dislocation by arranging detachable limiting structures on the front and rear ends of the tibial platform. However, the front limiting structure of this design is fixed in the front by screws, which will reduce the carrying capacity of the tibial platform and increase the risk of tibial platform fracture. In addition, this structure has no limiting structure on the side, and cannot solve the problem of rotational dislocation in clinical practice. In clinical practice, poor prosthesis position is more likely to cause liner rotation, and then cause the problem of liner dislocation.

[0008] SUMMARY

[0009] The problem to be solved by the present disclosure is to provide a simple structure, reduce the postoperative prosthesis anterior dislocation, posterior dislocation and rotational dislocation, and limit the activity of the single condyle prosthesis assembly.

[0010] To solve the above technical problems, the technical scheme adopted by the present disclosure is: a limiting type active single condyle prosthesis assembly, comprising a limiting type tibial platform and a limiting type tibial platform pad, the limiting type tibial platform pad is installed above the limiting type tibial platform, the limiting type tibial platform edge position is provided with a limiting protrusion, the limiting type tibial platform pad edge corresponding position is provided with a limiting groove, the limiting groove and the limiting protrusion are matched to realize the limiting of the limiting type tibial platform pad, and the upper surface of the limiting type tibial platform pad is provided with a limiting groove.

[0011] Optionally, the limiting protrusion comprises a first rear side limiting column, a first medial side limiting column and an outer side horizontal limiting boss, the first rear side limiting column and the first medial side limiting column are vertically arranged at the arc-shaped edge position of the upper surface of the first tibial platform, the outer side horizontal limiting boss is horizontally arranged on the first outer side vertical limiting side wall of the first limiting type tibial platform, and the first outer side vertical limiting side wall is arranged at the linear edge position of the upper surface of the first tibial platform.

[0012] Optionally, the limiting groove comprises a tibial platform pad outer side horizontal groove, a first tibial platform pad rear inner side groove and a first tibial platform pad front inner side groove, the lower ends of the first tibial platform pad rear inner side groove and the first tibial platform pad front inner side groove are communicated with the lower surface of the first tibial platform pad, the first tibial platform pad rear inner side groove and the first tibial platform pad front inner side groove are respectively matched with the first rear side limiting column and the first inner side limiting column, and the tibial platform pad outer side horizontal groove is matched with the outer side horizontal limiting boss.

[0013] Optionally, the transverse widths of the first tibial platform pad rear inner side groove and the first tibial platform pad front inner side groove are respectively greater than the transverse widths of the first rear side limiting column and the first inner side limiting column, and the transverse width of the outer side horizontal limiting boss is greater than the transverse width of the tibial platform pad outer side horizontal groove.

[0014] Optionally, the opening formed between the first outer side vertical limiting side wall and the first inner side limiting column is a first tibial platform front end opening, the first tibial platform front end opening has a width A, the opening formed between the first outer side vertical limiting side wall and the first rear side limiting column is a first tibial platform rear end opening, the first tibial platform rear end opening has a width B, the width of the limiting tibial platform pad is W, and A > W > B.

[0015] Optionally, the limiting protrusion comprises a second rear side limiting column and a front inner side limiting column, the second rear side limiting column and the front inner side limiting column are vertically arranged at the positions of the arc-shaped edges of the upper surface of the second tibial platform, and the upper ends of the second rear side limiting column and the front inner side limiting column are provided with inward protruding limiting blocks.

[0016] Optionally, the limiting groove comprises a second tibial platform pad rear inner side groove and a second tibial platform pad front inner side groove, the second tibial platform pad rear inner side groove and the second tibial platform pad front inner side groove are respectively matched with the limiting blocks at the upper ends of the second rear side limiting column and the front inner side limiting column.

[0017] Optionally, the position of the arc-shaped edge of the upper surface of the second tibial platform is further provided with a second inner side limiting column, and the second inner side limiting column is located between the second rear side limiting column and the front inner side limiting column.

[0018] Optionally, the position of the linear edge of the upper surface of the second tibial platform is provided with a second outer side vertical limiting side wall, and the second outer side vertical limiting side wall and the second inner side limiting column jointly realize the shielding limiting of the limiting tibial platform pad.

[0019] Optionally, the transverse widths of the second tibial platform pad rear inner side groove and the second tibial platform pad front inner side groove are respectively greater than the transverse widths of the limiting blocks of the second rear side limiting column and the front inner side limiting column.

[0020] By adopting the technical scheme, the present disclosure has the following beneficial effects:

[0021] The present disclosure has a simple structure, and the multiple structure limiting protrusions (limiting columns and limiting bosses) can effectively solve the dislocation problem of the existing clinical mobile unicompartmental liner (tibial platform pad).

[0022] The limiting tibial platform of the present disclosure is limited by the limiting protrusions with different structures, and the normal operation during surgery and the normal range of movement of the prosthesis after surgery are not affected, so that the clinical complications caused by the impact of bone spurs or bone cement and other foreign matters on the limiting tibial platform pad during high flexion of the knee joint can be avoided. At the same time, the rotation of the tibial platform pad caused by poor positioning of the prosthesis can be avoided, and the clinical complications of the posterior dislocation of the tibial platform pad can be avoided.

[0023] In addition, the upper surface of the limiting tibial platform pad of the present disclosure is provided with a limiting groove, and the limiting groove is provided in a spherical shape, so that the high dislocation rate caused by the too large movement range of the lateral compartment mobile unicompartmental prosthesis can be avoided, and the limiting mobile unicompartmental prosthesis assembly of the present disclosure can be applied to medial and lateral compartment replacement at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0024] The advantages and implementation modes of the present disclosure will be more obvious by referring to the drawings and combining the examples, and the contents shown in the drawings are only used to explain and describe the present disclosure, and do not constitute any limitation on the present disclosure. In the drawings:

[0025] Fig. 1 is a structural schematic view of a limiting mobile unicompartmental prosthesis assembly according to an embodiment of the present disclosure;

[0026] Fig. 2 is a front view of Fig. 1 of the present disclosure;

[0027] Fig. 3 is a top view of Fig. 1 of the present disclosure;

[0028] Fig. 4 is a right view of Fig. 1 of the present disclosure;

[0029] Fig. 5 is a structural schematic view of a first limiting tibial platform according to an embodiment of the present disclosure;

[0030] Fig. 6 is a structural schematic view of a first limiting tibial platform pad according to an embodiment of the present disclosure;

[0031] Fig. 7 is a top view of Fig. 5 of the present disclosure;

[0032] Fig. 8 is a side view of Fig. 6 of the present disclosure;

[0033] Fig. 9 is a structural schematic view of a limiting mobile unicompartmental prosthesis assembly according to an embodiment of the present disclosure;

[0034] Fig. 10 is a front view of Fig. 9 of the present disclosure;

[0035] Fig. 11 is a top view of Fig. 9 of the present disclosure;

[0036] Fig. 12 is a left view of Fig. 9 of the present disclosure;

[0037] Fig. 13 is a structural schematic diagram of a second limiting type tibial platform of an embodiment of the present disclosure;

[0038] Fig. 14 is a structural schematic diagram of a second limiting type tibial platform pad of an embodiment of the present disclosure.

[0039] In the drawings: 11, first limiting type tibial platform; 12, first limiting type tibial platform pad; 13, first tibial platform upper surface; 14, first posterior lateral limiting column; 15, first medial limiting column; 16, lateral horizontal limiting boss; 17, first lateral vertical limiting side wall; 18, first tibial platform pad lower surface; 19, first tibial platform pad upper surface; 110, tibial platform pad lateral horizontal groove; 111, first tibial platform pad posterior medial recess; 112, first tibial platform pad anterior medial recess; 21, second limiting type tibial platform; 22, second limiting type tibial platform pad; 23, second tibial platform upper surface; 24, second posterior lateral limiting column; 25, second medial limiting column; 26, anterior medial limiting column; 27, second lateral vertical limiting side wall; 28, second tibial platform pad lower surface; 29, second tibial platform pad upper surface; 230, second tibial platform pad posterior medial recess; 231, second tibial platform pad anterior medial recess. DETAILED DESCRIPTION

[0040] As shown in Figs. 1-14, the present disclosure is a limiting type mobile unicompartmental prosthesis assembly, which comprises a limiting type tibial platform and a limiting type tibial platform pad, the limiting type tibial platform pad is installed above the limiting type tibial platform, a limiting boss is arranged at the edge of the limiting type tibial platform, a limiting groove is arranged at the edge of the limiting type tibial platform pad corresponding to the limiting boss, the limiting groove and the limiting boss are matched to achieve the limiting of the limiting type tibial platform pad, and a limiting recess is arranged on the upper surface of the limiting type tibial platform pad.

[0041] As shown in FIG. 1 to FIG. 8, a constrained unicompartmental prosthesis assembly includes a constrained tibial platform (a first constrained tibial platform 11) and a constrained tibial platform pad (a first constrained tibial platform pad 12), the first constrained tibial platform 11 is provided with a limiting protrusion at the edge position, the limiting protrusion includes a first posterior limiting column 14, a first medial limiting column 15 and a lateral horizontal limiting boss 16, the first posterior limiting column 14 and the first medial limiting column 15 are vertically arranged at the arc-shaped edge position of the upper surface 13 of the first tibial platform, and the lateral horizontal limiting boss 16 is horizontally arranged on the first lateral vertical limiting side wall 17 of the first constrained tibial platform 11, which is arranged at the linear edge position of the upper surface 13 of the first tibial platform.

[0042] The first constrained tibial platform pad 12 is provided with a limiting groove at the edge position corresponding to the limiting protrusion, the limiting groove includes a tibial platform pad lateral horizontal groove 110, a first tibial platform pad posterior medial recess 111 and a first tibial platform pad anterior medial recess 112, the lower ends of the first tibial platform pad posterior medial recess 111 and the first tibial platform pad anterior medial recess 112 are connected with the lower surface 18 of the first tibial platform pad, and the first tibial platform pad posterior medial recess 111 and the first tibial platform pad anterior medial recess 112 are respectively arranged in cooperation with the first posterior limiting column 14 and the first medial limiting column 15, and the tibial platform pad lateral horizontal groove 110 is arranged in cooperation with the lateral horizontal limiting boss 16.

[0043] The upper surface 19 of the first tibial platform pad is provided with a spherical limiting recess.

[0044] The transverse widths of the first tibial platform pad posterior medial recess 111 and the first tibial platform pad anterior medial recess 112 are respectively greater than the transverse widths of the first posterior limiting column 14 and the first medial limiting column 15, and the transverse width of the lateral horizontal limiting boss 16 is greater than the transverse width of the tibial platform pad lateral horizontal groove 110.

[0045] In addition, as shown in FIG. 7 and FIG. 8, the opening formed between the first lateral vertical limiting side wall 17 and the first medial limiting column 15 is a first tibial platform anterior end opening, the width of the first tibial platform anterior end opening is A; the opening formed between the first lateral vertical limiting side wall 17 and the first posterior limiting column 14 is a first tibial platform posterior end opening, the width of the first tibial platform posterior end opening is B; and the width of the first constrained tibial platform pad 12 is W.

[0046] A > W > B

[0047] The design facilitates the installation of the first constrained tibial platform pad 12 and avoids the dislocation of the posterior side of the first constrained tibial platform pad 12.

[0048] The first outer vertical limiting side wall 17 is provided with a space for positioning on one side of the first tibial platform front end opening.

[0049] As shown in FIGS. 9-14, a constrained mobile unicompartmental prosthesis assembly includes a constrained tibial platform (second constrained tibial platform 21) and a constrained tibial platform pad (second constrained tibial platform pad 22), the second constrained tibial platform 21 is provided with a limiting protrusion at the edge position, the limiting protrusion includes a second posterior limiting column 24 and an anterior-medial limiting column 26, the second posterior limiting column 24 and the anterior-medial limiting column 26 are vertically arranged at both sides of the arc-shaped edge of the upper surface 23 of the second tibial platform, the upper end of the second posterior limiting column 24 and the anterior-medial limiting column 26 is provided with an inward protruding limiting block, the limiting block of the second posterior limiting column 24 is in a semi-circular cross-section, and the limiting block of the anterior-medial limiting column 26 is in a rectangular cross-section.

[0050] The edge of the second constrained tibial platform pad 22 is provided with a limiting groove at the corresponding position of the limiting protrusion, the limiting groove includes a second tibial platform pad posterior-medial groove 230 and a second tibial platform pad anterior-medial groove 231, the second tibial platform pad posterior-medial groove 230 and the second tibial platform pad anterior-medial groove 231 are not connected to the lower surface 28 of the second tibial platform pad, and are embedded grooves, the second tibial platform pad posterior-medial groove 230 and the second tibial platform pad anterior-medial groove 231 are respectively matched with the limiting blocks at the upper end of the second posterior limiting column 24 and the anterior-medial limiting column 26.

[0051] The arc-shaped edge position of the upper surface 23 of the second tibial platform is also provided with a second medial limiting column 25, the second medial limiting column 25 is located between the second posterior limiting column 24 and the anterior-medial limiting column 26, and the second medial limiting column 25 is in contact or non-contact with the side of the second constrained tibial platform pad 22.

[0052] The linear edge position of the upper surface 23 of the second tibial platform is provided with a second outer vertical limiting side wall 27, and the second outer vertical limiting side wall 27 and the second medial limiting column 25 together realize the shielding limiting of the second constrained tibial platform pad 22.

[0053] The upper surface 29 of the second tibial platform pad is provided with a spherical limiting groove.

[0054] The transverse width of the second tibial platform pad posterior-medial groove 230 and the second tibial platform pad anterior-medial groove 231 is greater than the transverse width of the limiting blocks of the second posterior limiting column 24 and the anterior-medial limiting column 26.

[0055] The above detailed description of the embodiments of the present disclosure is only the preferred embodiments of the present disclosure, and cannot be considered as limiting the scope of the present disclosure. Any equivalent changes and improvements made within the scope of the present disclosure should still be considered as falling within the scope of the present disclosure. Industrial applicability

[0056] The present application has the advantages that the simple structure and the multiple structure of the limiting convex (limiting column, limiting boss) can effectively solve the dislocation problem of the existing clinical mobile unicompartmental liner (tibial platform pad). The tibial platform pad is limited by the multiple structure of the limiting convex, and the normal operation and the normal range of the prosthesis after the operation are not affected. The clinical complications caused by the impact of the bone spurs or the bone cement on the tibial platform pad can be avoided. In addition, the rotation of the tibial platform pad caused by the poor positioning of the prosthesis can be avoided, and the clinical complications caused by the rotation of the tibial platform pad can be avoided.

Claims

1. A constrained, mobile unicompartmental prosthesis assembly, characterized in that: It includes a restrictive tibial plateau and a restrictive tibial plateau pad. The restrictive tibial plateau pad is installed above the restrictive tibial plateau. A limiting protrusion is set at the edge of the restrictive tibial plateau. A limiting groove is set at the edge of the restrictive tibial plateau pad corresponding to the limiting protrusion. The limiting groove and the limiting protrusion are matched to realize the limitation of the restrictive tibial plateau pad. The upper surface of the restrictive tibial plateau pad is provided with a limiting groove.

2. The constrained mobile unicompartmental prosthesis assembly according to claim 1, characterized in that: The limiting protrusion includes a first rear limiting column, a first inner limiting column and an outer horizontal limiting boss. The first rear limiting column and the first inner limiting column are vertically arranged on the arc edge position of the upper surface of the first tibial platform. The outer horizontal limiting boss is horizontally arranged on the first outer vertical limiting side wall of the first restrictive tibial platform. The first outer vertical limiting side wall is arranged on the straight edge position of the upper surface of the first tibial platform.

3. The constrained mobile unicompartmental prosthesis assembly according to claim 2, characterized in that: The limiting groove includes an outer horizontal groove of the tibial plateau pad, a posterior medial groove of the first tibial plateau pad and an anterior medial groove of the first tibial plateau pad. The lower ends of the posterior medial groove of the first tibial plateau pad and the anterior medial groove of the first tibial plateau pad are connected to the lower surface of the first tibial plateau pad. The posterior medial groove of the first tibial plateau pad and the anterior medial groove of the first tibial plateau pad are respectively cooperated with the first posterior limiting column and the first medial limiting column, and the outer horizontal groove of the tibial plateau pad is cooperated with the outer horizontal limiting boss.

4. The constrained mobile unicompartmental prosthesis assembly according to claim 3, characterized in that: The lateral widths of the posterior medial groove of the first tibial plateau pad and the anterior medial groove of the first tibial plateau pad are respectively greater than the lateral widths of the first posterior limiting column and the first medial limiting column; the lateral width of the lateral horizontal limiting boss is greater than the lateral width of the lateral horizontal groove of the tibial plateau pad.

5. The constrained mobile unicompartmental prosthesis assembly according to claim 4, characterized in that: The opening formed between the first lateral vertical limiting sidewall and the first medial limiting column is the front end opening of the first tibial plateau, and the width of the front end opening of the first tibial plateau is A; the opening formed between the first lateral vertical limiting sidewall and the first rear side limiting column is the rear end opening of the first tibial plateau, and the width of the rear end opening of the first tibial plateau is B; the width of the restrictive tibial plateau pad is W, A>W>B.

6. The constrained mobile unicompartmental prosthesis assembly according to any one of claims 1 to 5, characterized in that: The limiting protrusion includes a second rear limiting column and an anterior medial limiting column, and the second rear limiting column and the anterior medial limiting column are vertically arranged on both sides of the arc edge of the upper surface of the second tibial platform, and the upper ends of the second rear limiting column and the anterior medial limiting column are provided with inwardly protruding limiting blocks.

7. The constrained mobile unicompartmental prosthesis assembly according to claim 6, characterized in that: The limiting groove includes a second tibial plateau pad posterior medial groove and a second tibial plateau pad anterior medial groove, and the second tibial plateau pad posterior medial groove and the second tibial plateau pad anterior medial groove are respectively cooperated with the limiting blocks at the upper ends of the second posterior limiting column and the anterior medial limiting column.

8. The constrained mobile unicompartmental prosthesis assembly according to any one of claims 6 to 7, characterized in that: A second medial limiting column is further provided at the arc-shaped edge of the upper surface of the second tibial platform, and the second medial limiting column is located between the second rear limiting column and the front medial limiting column.

9. The constrained mobile unicompartmental prosthesis assembly according to claim 8, characterized in that: A second outer vertical limiting side wall is provided at a straight edge position of the upper surface of the second tibial plateau. The second outer vertical limiting side wall and the second inner limiting column together realize the shielding limiting of the restrictive tibial plateau pad.

10. The constrained mobile unicompartmental prosthesis assembly according to any one of claims 7 to 9, characterized in that: The lateral widths of the second tibial plateau pad posterior medial groove and the second tibial plateau pad anterior medial groove are respectively greater than the lateral widths of the limiting blocks of the second posterior limiting column and the anterior medial limiting column.

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