Restrictive ankle joint prosthesis

Abstract

The utility model discloses a restrictive ankle joint prosthesis, which belongs to the technical field of prostheses, and comprises a connecting column, the outer surface of the connecting column is fixedly connected with a prosthesis connecting plate, the top end of the connecting column is provided with a positioning chute, the top end of the connecting column is fixedly connected with a compression spring, and the top end of the compression spring is fixedly connected with a buffer ring. Two sets of stable sliding rods are fixedly connected to the upper surface of the prosthesis connecting plate, an intramedullary rod is arranged above the prosthesis connecting plate, and a connecting groove is formed in the bottom end of the intramedullary rod. According to the restrictive ankle joint prosthesis, through cooperation of the prosthesis connecting plate, the connecting column, the positioning sliding groove, the compression spring, the buffer ring, the positioning sliding rod, the intramedullary rod and the connecting groove, the impact force between the intramedullary rod and the connecting column is counteracted through elastic force accumulated in the compression spring, and then the limiting ankle joint prosthesis is formed through cooperation of the stabilizing sliding rod and the stabilizing sliding groove. Therefore, the torsion resistance of the prosthesis is improved, the stability of the prosthesis is improved, and the service life of the prosthesis is prolonged.

Description

Technical Field

[0001] The present application belongs to the technical field of prostheses, and in particular relates to a restrictive ankle joint prosthesis. Background Art

[0002] Ankle osteoarthritis is a common disease among middle-aged and elderly people, characterized by ankle pain, limited ankle movement, and even affected walking, especially end-stage ankle osteoarthritis, which can seriously affect the quality of life of middle-aged and elderly people and cause long-term distress to patients. In related technologies, ankle fusion or tibiotalar fusion is often used for patients with end-stage ankle osteoarthritis who do not respond to conservative treatment.

[0003] The utility model with the existing authorization announcement number CN219000742U discloses an ankle joint prosthesis, including a tibial prosthesis, the lower surface of which is an inner concave surface; and a talar prosthesis, the upper surface of which is an outer convex surface, the inner concave surface and the outer convex surface are both arch structures in the front-to-back direction, and the tibial prosthesis and the talar prosthesis are rotatably connected via the inner concave surface and the outer convex surface; wherein a stop structure is arranged between the tibial prosthesis and the talar prosthesis.

[0004] With the above-mentioned technical solution, when the stop protrusion slides in the stop groove in the front-to-back direction, the stop protrusion can move to a position in contact with the two ends of the stop groove, thereby limiting the rotation angle of the tibial prosthesis relative to the talar prosthesis, thereby ensuring the range of motion of the ankle joint. However, with the above-mentioned technical solution, when the restrictive ankle prosthesis is used, since the patient needs to flexibly use the prosthesis, a certain pressure may be exerted on the prosthesis, thereby causing the connection position between the tibial prosthesis and the intramedullary rod to be subjected to greater pressure and torque. The connection position between the tibial prosthesis and the intramedullary rod of the prosthesis is only connected together by a thread, and does not have a buffer structure, which can easily cause the connection position to break, thereby affecting the service life of the ankle prosthesis.

[0005] Therefore, we proposed a restrictive ankle prosthesis to solve the above problems. Utility Model Content

[0006] The purpose of the present application is to solve the problem in the prior art that the connection position between the tibial prosthesis and the intramedullary rod of the prosthesis does not have a buffer structure, and to propose a restrictive ankle joint prosthesis.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A restrictive ankle joint prosthesis comprises a connecting column, the outer surface of which is fixedly connected to a prosthesis connecting plate, the top of which is provided with a positioning slide groove, the top of which is fixedly connected to a compression spring, the top of which is fixedly connected to a buffer ring, the upper surface of the prosthesis connecting plate is fixedly connected to two groups of stabilizing slide bars, an intramedullary rod is arranged above the prosthesis connecting plate, the bottom end of the intramedullary rod is provided with a connecting groove, the connecting column and the compression spring are both slidably connected to the inside of the connecting groove, the upper surface of the buffer ring is in contact with the inner top wall of the connecting groove, the inner top wall of the connecting groove is fixedly connected to a positioning slide bar, the positioning slide bar is slidably connected to the inside of the positioning slide groove, the bottom end of the intramedullary rod is provided with two groups of stabilizing slide grooves, and each group of stabilizing slide bars is slidably connected to the inside of the stabilizing slide groove.

[0009] Preferably, a tibial prosthesis is sleeved on the outer surface of the connecting column, and a sliding column is fixedly connected to the bottom end of the connecting column.

[0010] Preferably, a talar prosthesis is disposed below the tibial prosthesis, and two groups of connecting pins are fixedly connected to the bottom surface of the talar prosthesis.

[0011] Preferably, a stop protrusion groove and two stop grooves are respectively provided on the upper surface of the talar prosthesis, each of the stop grooves is communicated with the stop protrusion groove, and the sliding column is rotatably connected to the inside of the stop protrusion groove.

[0012] Preferably, the outer surface of the sliding column is fixedly connected to a limiting ring, and the upper surface of the limiting ring is in contact with the inner top wall of the tibial prosthesis.

[0013] Preferably, a first plate is disposed above the tibial prosthesis, the inner wall of the first plate contacts the outer surface of the connecting column, and the upper surface of the first plate contacts the bottom surface of the prosthesis connecting plate.

[0014] Preferably, the outer surface of the connecting column is sleeved with a second plate body, the bottom surface of the second plate body is in contact with the upper surface of the prosthesis connecting plate, the upper surface of the second plate body is provided with two groups of through holes, and each group of the stabilizing slide bars is clamped inside the through holes.

[0015] Preferably, an auxiliary clamping hole is opened at the top end of each group of the stabilizing slide bars, an auxiliary clamping column is fixedly connected to the inner top wall of each group of the stabilizing slide grooves, and each group of the auxiliary clamping columns is clamped inside the auxiliary clamping hole.

[0016] In summary, the technical effects and advantages of the present application are as follows: by providing a prosthesis connecting plate, a connecting column, a positioning slide groove, a compression spring, a buffer ring, a positioning slide rod, an intramedullary rod and a connecting groove, the connecting column, the compression spring and the buffer ring can be used to slide in the connecting groove of the intramedullary rod, so that when the ankle joint prosthesis is subjected to vertical downward pressure, the compression spring can be compressed, and the positioning slide rod can slide up and down in the positioning slide groove, so that the elastic force accumulated in the compression spring can be used to offset the impact force between the intramedullary rod and the connecting column, and the buffer ring can be used to buffer the pressure between the compression spring and the intramedullary rod, so that the restrictive ankle joint prosthesis structure can be made more stable, and then by using the cooperation of the stabilizing slide rod and the stabilizing slide groove, multiple groups of stabilizing slide rods can be slid in the stabilizing slide groove, and when the restrictive ankle joint prosthesis is subjected to horizontal torsion, the positioning structure composed of the stabilizing slide rod and the stabilizing slide groove can be used to improve the torsion resistance of the ankle joint prosthesis, thereby further improving the stability of the ankle joint prosthesis and extending the service life of the ankle joint prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the intramedullary rod of the utility model;

[0018] Figure 2 It is a three-dimensional structural schematic diagram of the talus prosthesis of the utility model;

[0019] Figure 3 It is a three-dimensional structural schematic diagram of the connecting column of the utility model;

[0020] Figure 4 It is a three-dimensional structural diagram of a bottom view of the tibial prosthesis of the utility model;

[0021] Figure 5 It is a three-dimensional structural schematic diagram of the second plate body of the utility model;

[0022] Figure 6 It is a three-dimensional structural schematic diagram of a cross-sectional view of the intramedullary rod of the utility model.

[0023] In the figure: 1. talar prosthesis; 2. connecting pin; 3. tibial prosthesis; 4. first plate; 5. prosthesis connecting plate; 6. second plate; 7. intramedullary rod; 8. stop protrusion groove; 9. stop groove; 10. stabilizing slide bar; 11. auxiliary clamping hole; 12. connecting column; 13. positioning slide groove; 14. compression spring; 15. buffer ring; 16. sliding column; 17. limiting ring; 18. connecting groove; 19. insertion hole; 20. positioning slide bar; 21. stabilizing slide groove; 22. auxiliary clamping column. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] Reference Figure 1-6 A restrictive ankle joint prosthesis includes a connecting column 12, the outer surface of which is sleeved with a tibial prosthesis 3, and the bottom end of the connecting column 12 is fixedly connected with a sliding column 16. The connecting column 12 is rotated in the tibial prosthesis 3 to make the sliding column 16 rotate and move at the lower part of the restrictive ankle joint prosthesis, so as to restrict the movement of the ankle joint prosthesis, thereby improving the flexibility of the ankle joint prosthesis.

[0026] The outer surface of the sliding column 16 is fixedly connected to a limiting ring 17, and the upper surface of the limiting ring 17 contacts the inner top wall of the tibial prosthesis 3. The limiting ring 17 is used to limit the sliding column 16 and enable the connecting column 12 to rotate stably in the tibial prosthesis 3.

[0027] A talar prosthesis 1 is arranged below the tibial prosthesis 3, and two groups of connecting needles 2 are fixedly connected to the bottom surface of the talar prosthesis 1. The two groups of connecting needles 2 fixed to the bottom surface of the talar prosthesis 1 are used to connect it to the patient's body, so that the ankle joint prosthesis can be firmly installed at the position required by the patient.

[0028] The outer surface of the connecting column 12 is fixedly connected to the prosthesis connecting plate 5, the top of the connecting column 12 is provided with a positioning groove 13, the top of the connecting column 12 is fixedly connected to the compression spring 14, the top of the compression spring 14 is fixedly connected to the buffer ring 15, the upper surface of the talar prosthesis 1 is respectively provided with a stop protrusion groove 8 and two stop grooves 9, each stop groove 9 is connected to the stop protrusion groove 8, the sliding column 16 is rotatably connected to the inside of the stop protrusion groove 8, the stop protrusion groove 8 and the two stop grooves 9 provided on the talar prosthesis 1 are utilized to enable the sliding column 16 to rotate in the stop protrusion groove 8, and the tibial prosthesis 3 can be moved along the talar prosthesis 1 to enable the sliding column 16 to move in the stop groove 9.

[0029] Two groups of stabilizing slide bars 10 are fixedly connected to the upper surface of the prosthesis connecting plate 5. A first plate body 4 is arranged above the tibial prosthesis 3. The inner wall of the first plate body 4 contacts the outer surface of the connecting column 12. The upper surface of the first plate body 4 contacts the bottom surface of the prosthesis connecting plate 5. The first plate body 4 is arranged between the tibial prosthesis 3 and the prosthesis connecting plate 5 to reduce the friction between the tibial prosthesis 3 and the prosthesis connecting plate 5.

[0030] An intramedullary rod 7 is arranged above the prosthesis connecting plate 5, and a connecting groove 18 is provided at the bottom end of the intramedullary rod 7. The connecting column 12 and the compression spring 14 are both slidably connected to the inside of the connecting groove 18, and the upper surface of the buffer ring 15 is in contact with the inner top wall of the connecting groove 18. The outer surface of the connecting column 12 is sleeved with a second plate body 6, and the bottom surface of the second plate body 6 is in contact with the upper surface of the prosthesis connecting plate 5. Two groups of through holes 19 are provided on the upper surface of the second plate body 6. Each group of stabilizing slide bars 10 is clamped in the inside of the through hole 19, and is arranged between the prosthesis connecting plate 5 and the intramedullary rod 7 through the second plate body 6 to reduce the friction between the prosthesis connecting plate 5 and the intramedullary rod 7.

[0031] The inner top wall of the connecting groove 18 is fixedly connected with a positioning slide bar 20, and the positioning slide bar 20 is slidably connected to the inside of the positioning slide bar 13. Two groups of stabilizing slide bars 21 are opened at the bottom end of the intramedullary rod 7. Each group of stabilizing slide bars 10 is slidably connected to the inside of the stabilizing slide bar 21. An auxiliary clamping hole 11 is opened at the top of each group of stabilizing slide bars 10. The inner top wall of each group of stabilizing slide bars 21 is fixedly connected with an auxiliary clamping column 22, and each group of auxiliary clamping columns 22 is clamped to the inside of the auxiliary clamping hole 11. The auxiliary clamping column 22 is clamped to the inside of the auxiliary clamping hole 11, and the auxiliary stabilizing slide bar 10 slides in the stabilizing slide bar 21 to further improve the torsional resistance of the restrictive ankle joint prosthesis.

[0032] The working principle of the utility model is as follows: when the restrictive ankle joint prosthesis needs to be installed and used to the position required by the patient, the medical staff first installs the talar prosthesis 1 to the patient's foot and uses the connecting needle 2 to connect with the flesh, so that the restrictive ankle joint prosthesis can be easily installed, and at the same time, the intramedullary rod 7 can be installed inside the patient's leg bone, so that the restrictive ankle joint prosthesis can be installed to the position required by the patient, and the restrictive ankle joint prosthesis can be used to replace the patient's ankle structure. When the patient walks, the sliding column 16 fixed under the tibial prosthesis 3 can be rotated and moved in the stop protrusion groove 8 and the stop groove 9 opened on the talar prosthesis 1, so that the ankle joint prosthesis can be used normally, and during use, the intramedullary rod 7 and the tibial prosthesis 3 can be rotated and moved. The connection position between them is subjected to greater pressure and torsion, and the connecting column 12, the compression spring 14 and the buffer ring 15 can be used to slide in the connecting groove 18 under the intramedullary rod 7, and the elastic force of the compression spring 14 can be used to make the positioning slide bar 20 slide in the positioning slide groove 13, which can conveniently offset the pressure on the connection position to improve the stability of the restrictive ankle joint prosthesis, and multiple groups of stabilizing slide bars 10 are fixed on the prosthesis connecting plate 5, which can make the stabilizing slide bar 10 slide in the stabilizing slide groove 21 opened under the intramedullary rod 7, so as to limit the vertical sliding of the intramedullary rod 7, so as to reduce the damage to the connection position caused by the torsion, thereby further improving the stability of the restrictive ankle joint prosthesis and extending the service life of the ankle joint prosthesis.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A restrictive ankle joint prosthesis, comprising a connecting column (12), characterized in that: The outer surface of the connecting column (12) is fixedly connected to a prosthesis connecting plate (5), the top end of the connecting column (12) is provided with a positioning slide groove (13), the top end of the connecting column (12) is fixedly connected to a compression spring (14), the top end of the compression spring (14) is fixedly connected to a buffer ring (15), the upper surface of the prosthesis connecting plate (5) is fixedly connected to two groups of stabilizing slide bars (10), an intramedullary rod (7) is arranged above the prosthesis connecting plate (5), and the bottom end of the intramedullary rod (7) is provided with a connecting groove (13). 8), the connecting column (12) and the compression spring (14) are both slidably connected to the inside of the connecting groove (18), the upper surface of the buffer ring (15) is in contact with the inner top wall of the connecting groove (18), the inner top wall of the connecting groove (18) is fixedly connected with a positioning slide rod (20), the positioning slide rod (20) is slidably connected to the inside of the positioning slide groove (13), and two groups of stabilizing slide grooves (21) are opened at the bottom end of the intramedullary rod (7), and each group of stabilizing slide rods (10) is slidably connected to the inside of the stabilizing slide groove (21).

2. A restrictive ankle joint prosthesis according to claim 1, characterized in that: The outer surface of the connecting column (12) is sleeved with a tibial prosthesis (3), and the bottom end of the connecting column (12) is fixedly connected to a sliding column (16).

3. A restrictive ankle joint prosthesis according to claim 2, characterized in that: A talar prosthesis (1) is arranged below the tibial prosthesis (3), and two groups of connecting pins (2) are fixedly connected to the bottom surface of the talar prosthesis (1).

4. A restrictive ankle joint prosthesis according to claim 3, characterized in that: The upper surface of the talar prosthesis (1) is provided with a stop protrusion groove (8) and two stop grooves (9), each of the stop grooves (9) is connected to the stop protrusion groove (8), and the sliding column (16) is rotatably connected to the inside of the stop protrusion groove (8).

5. The restrictive ankle joint prosthesis according to claim 2, characterized in that: The outer surface of the sliding column (16) is fixedly connected to a limiting ring (17), and the upper surface of the limiting ring (17) is in contact with the inner top wall of the tibial prosthesis (3).

6. The restrictive ankle joint prosthesis according to claim 2, characterized in that: A first plate body (4) is arranged above the tibial prosthesis (3); the inner wall of the first plate body (4) contacts the outer surface of the connecting column (12); and the upper surface of the first plate body (4) contacts the bottom surface of the prosthesis connecting plate (5).

7. The restrictive ankle joint prosthesis according to claim 1, characterized in that: The outer surface of the connecting column (12) is sleeved with a second plate body (6), the bottom surface of the second plate body (6) is in contact with the upper surface of the prosthesis connecting plate (5), and the upper surface of the second plate body (6) is provided with two groups of through holes (19), and each group of the stabilizing slide bars (10) is clamped inside the through holes (19).

8. The restrictive ankle joint prosthesis according to claim 1, characterized in that: The top of each group of the stabilizing slide bars (10) is provided with an auxiliary clamping hole (11), the inner top wall of each group of the stabilizing slide grooves (21) is fixedly connected with an auxiliary clamping column (22), and each group of the auxiliary clamping columns (22) is clamped inside the auxiliary clamping hole (11).

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