A talar split total ankle prosthesis

Abstract

The present invention relates to the field of medical devices, and in particular to a talar split total ankle prosthesis. The talar split total ankle prosthesis provided by the present invention includes a tibial component of the tibiotalar joint, and also includes a rotating fitting, wherein the rotating fitting includes a detachably connected talar component of the talo-talar joint and a talonavicular component of the talo-talar joint. The total ankle prosthesis with a talar split design provided by the present invention is easy to install during surgery, and solves many problems in clinical practice such as difficulty in placing or improper installation of the prosthesis, great damage to the surrounding soft tissues during surgery, and even fractures around the prosthesis caused by the large number of ligaments around the ankle, small surgical field of view, inability to fully expose the patient area, and insufficient surgical operation space. It has little damage to the ligaments and other tissues around the talus, can effectively save surgical time, and has good industrialization prospects.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and in particular to a talus split total ankle prosthesis. Background Art

[0002] The talus is the largest irregular bone in the human body. It is located in the ankle cavity and forms the tibiotalar joint (ankle joint), subtalar joint and talonavicular joint with the distal articular surface of the tibia, the anterior, middle and posterior articular surfaces of the calcaneus and the navicular bone. The anatomical structure is relatively complex. For patients with lesions of the entire talus (including primary tumors of the talus, aseptic necrosis, severe comminuted fractures and dislocations of the talus, etc.), total ankle replacement is required. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a talar split total ankle prosthesis to solve the problems in the prior art.

[0004] To achieve the above-mentioned purpose and other related purposes, the present invention provides a talar split total ankle prosthesis, including a tibial side component of a tibiotalar joint, the tibial side component of the tibiotalar joint including a first support portion, a distal tibia contact surface provided on the first support portion, a first insert provided on the distal tibia contact surface, a rotational fitting groove provided on the side of the first support portion opposite to the distal tibia contact surface, and also including a rotational fitting component, the rotational fitting component can be at least partially contained in the rotational fitting groove, the rotational fitting component includes a detachably connected talar side component of a calcaneus joint and a talonavicular side component of a talonavicular joint, a non-contained portion of the talar side component of the talonavicular joint is also provided with a calcaneal contact surface, a second insert provided on the calcaneal contact surface, a non-contained portion of the talar side component of the talonavicular joint is also provided with a navicular contact surface, and a third insert provided on the navicular contact surface.

[0005] In some embodiments of the present invention, the distal tibia contact surface is a plane, the distal tibia contact surface is a rough surface, the surface of the distal tibia contact surface is a porous coating, the porous coating on the surface of the distal tibia contact surface has a thickness of 1.5 to 2 mm, a pore size of 600 to 800 μm, and a porosity of 70 to 80%.

[0006] In some embodiments of the present invention, the calcaneal contact surface is a plane, the calcaneal contact surface is a rough surface, the surface of the calcaneal contact surface is a porous coating, the thickness of the porous coating on the surface of the calcaneal contact surface is 1.5 to 2 mm, the pore size is 600 to 800 μm, and the porosity is 70 to 80%.

[0007] In some embodiments of the present invention, the navicular bone contact surface is a plane, the navicular bone contact surface is a rough surface, the surface of the navicular bone contact surface is a porous coating, the porous coating on the surface of the navicular bone contact surface has a thickness of 1.5 to 2 mm, a pore size of 600 to 800 μm, and a porosity of 70 to 80%.

[0008] In some embodiments of the present invention, the angle between the distal tibia contact surface and the calcaneal contact surface is 20-55°.

[0009] In some embodiments of the present invention, the angle between the distal tibia contact surface and the navicular bone contact surface is 22.5-57.5°.

[0010] In some embodiments of the present invention, the angle between the calcaneal contact surface and the navicular contact surface is 90-120°.

[0011] In some embodiments of the present invention, the rotational matching groove is a rectangular groove with a rounded bottom, and the shape of the containing portion of the rotational matching piece matches the rotational matching groove.

[0012] In some embodiments of the present invention, a first fixing through hole is provided on the first inserting member.

[0013] In some embodiments of the present invention, a second fixing through hole is provided on the second inserting member.

[0014] In some embodiments of the present invention, a third fixing through hole is provided on the third inserting member.

[0015] In some embodiments of the present invention, the rotation angle of the rotating fitting is ≤35°.

[0016] In some embodiments of the present invention, the angle between the rotational surface of the rotational fitting and the contact surface of the distal end of the tibia is 85-90°.

[0017] In some embodiments of the present invention, the talar-side component of the talocalcaneal joint and the talar-side component of the talonavicular joint are connected by interference fit.

[0018] In some embodiments of the present invention, positioning devices are respectively provided on the contact surfaces between the talar-lateral component of the talocalcaneal joint and the talar-lateral component of the talonavicular joint, and the positioning devices include a positioning piece and a positioning groove.

[0019] In some embodiments of the present invention, a process groove is further included, wherein the process groove is located at the junction of the talar side component of the talocalcaneal joint and the talar side component of the talonavicular joint.

[0020] In some embodiments of the present invention, the talus split total ankle prosthesis is prepared by 3D printing technology.

[0021] In some embodiments of the present invention, the material of the tibial component of the tibiotalar joint is selected from polyethylene.

[0022] In some embodiments of the present invention, the material of the talar side component of the talocalcaneal joint and / or the talonavicular side component is selected from titanium alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shown is a schematic diagram of the assembly of the present invention.

[0024] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 3 Shown is a schematic diagram of the use of the present invention.

[0026] Figure 4 It is a schematic diagram of the structure of the talonavicular joint talon side component of the present invention.

[0027] Figure 5 Shown is a schematic diagram of the structure of the talar side component of the calcaneus joint of the present invention.

[0028] Figure 6 Shown is a schematic structural diagram of the tibial component of the tibiotalar joint of the present invention.

[0029] Component number description

[0030] 1 Tibial component of tibiotalar joint

[0031] 11. First support part

[0032] 12 Distal tibial contact surface

[0033] 13 First Insert

[0034] 14 Rotation fit groove

[0035] 15 First fixing hole

[0036] 2 Rotating mating parts

[0037] 21 Talocalcaneal joint talar component

[0038] 211 Calcaneus contact surface

[0039] 212 Second Insert

[0040] 213 Positioning slot

[0041] 214 second fixing through hole

[0042] 22 Talonavicular joint talon side

[0043] 221 navicular bone contact surface

[0044] 222 Third Insert

[0045] 223 Positioning parts

[0046] 224 Third fixing through hole

[0047] 23 Crafting Slots DETAILED DESCRIPTION

[0048] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0049] See also Figures 1 to 6 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0050] like Figures 1 to 6As shown, the present invention provides a talus split total ankle prosthesis, including a tibiotalar joint tibial component 1, the tibiotalar joint tibial component 1 includes a first support portion 11, a distal tibia contact surface 12 is provided on the first support portion 11, a first insert 13 is provided on the distal tibia contact surface 12, a rotational fitting groove 14 is provided on the side of the first support portion 11 opposite to the distal tibia contact surface 12, and also includes a rotational fitting component 2, the rotational fitting component 2 can be at least partially contained in the rotational fitting groove 14, the rotational fitting component 2 includes a detachably connected calcaneal joint talus side component 21 and a talonavicular joint talus side component 22, the non-inclusive portion of the calcaneal joint talus side component 21 is also provided with a calcaneal contact surface 211, the calcaneal contact surface 211 is provided with a second insert 212, the non-inclusive portion of the talonavicular joint talus side component 22 is also provided with a navicular contact surface 221, and the navicular contact surface 221 is provided with a third insert 222. After the two components of the calcaneal joint calcaneal side component 21 and the talonavicular joint calcaneal side component 22 are assembled, a rotational fitting component 2 can be formed. The rotational fitting component 2 usually includes an inclusion portion, and the shape of the inclusion portion usually matches the rotational fitting groove 14, so that the inclusion portion can be included in the rotational fitting groove 14, so that the calcaneal contact surface 211 and the navicular contact surface 221 on the rotational fitting component 2 rotate around the tibiotalar joint tibial side component 1. Figure 3 As shown, the distal tibia contact surface 12 is used to contact the cross section of the distal tibia or the tissues near it, and the first insert 13 is used to be inserted into the distal tibia, so that the tibia-side component 1 of the tibia-talar joint is stably connected to the distal tibia as a whole. The calcaneal contact surface 211 is used to contact the cross section of the calcaneal or the tissues near it, and the second insert 212 is used to be inserted into the calcaneal, so that the calcaneal-side component 21 of the calcaneal-talar joint is stably connected to the calcaneal as a whole. The navicular contact surface 221 is used to contact the cross section of the navicular or the tissues near it, and the third insert 222 is used to be inserted into the navicular, so that the calcaneal-side component 22 of the talonavicular joint is stably connected to the navicular. The talar split total ankle prosthesis adopts a split design. By selecting appropriate fixing points and contact surfaces, it not only causes little damage to the ligaments and other tissues around the talus during use, but also can effectively save surgical time. When in use, the radial deformation of the containing portion on the rotating mating component 2 and the rotating mating groove 14 can also generate a large pressure on the mating surface, so that when the patient stands and walks, appropriate friction can be generated by the compression force to transmit the load and form an effective support.

[0051] In the talus split total ankle prosthesis provided by the present invention, Figure 1As shown, when the containing portion of the rotational fitting member 2 is contained in the rotational fitting groove 14, the angle between the distal tibia contact surface 12 and the calcaneal contact surface 211 can be 20-55°, the angle between the distal tibia contact surface 12 and the navicular contact surface 221 is 22.5-57.5°, and the angle between the calcaneal contact surface 211 and the navicular contact surface 221 is 90-120°. In the use state, the angle between the calcaneal contact surface 211 and the navicular contact surface 221 is usually fixed (but the angle is usually adjusted appropriately according to the condition of the subject), and due to the matching relationship between the rotational fitting member 2 and the rotational fitting groove 14, the angle between the distal tibia contact surface 12 and the calcaneal contact surface 211, and the angle between the distal tibia contact surface 12 and the navicular contact surface 221 can usually change within a certain range. In a preferred embodiment of the present invention, the three planes of the distal tibia contact surface 12, the calcaneal contact surface 211, and the navicular contact surface 221 can form a column as a whole. In another preferred embodiment of the present invention, the rotation angle of the rotating fitting 2 is usually ≤35°, for example, the designed ankle joint inversion activity angle can be no more than 17.5°, and the eversion activity angle can be no more than 17.5°, but its overall rotation angle is usually not less than 20-30° to ensure sufficient eversion and eversion activity angles. In another preferred embodiment of the present invention, the angle between the rotating surface of the rotating fitting 2 (i.e., the plane formed when the rotating fitting 2 rotates) and the distal tibia contact surface 12 can be 85-90°. In another preferred embodiment of the present invention, the containing portion of the rotating fitting 2 is a smooth arched convex surface, and the rotating matching groove 14 is a rectangular groove with rounded bottom surface, and the shapes of the two are matched, and the containing portion of the rotating fitting 2 can usually be placed in the rotating matching groove 14 with precise matching, and can achieve free sliding forward and backward.

[0052] In the talus split total ankle prosthesis provided by the present invention, Figure 2 , 6As shown, the distal tibia contact surface 12 can be a plane, and the distal tibia contact surface 12 is usually a rough surface. For example, the surface of the distal tibia contact surface 12 can be a porous coating, and the thickness of the porous coating on the surface of the distal tibia contact surface 12 can be 1.5-2 mm, the pore size can be 600-800 μm, and the porosity can be 70-80%. The first insert 13 can also be provided with a first fixing through hole 15 for connecting the first insert 13 and the distal tibia or its surrounding tissue, so that the tibia-talar joint tibial component 1 can be stably connected to the distal tibia as a whole. In a preferred embodiment of the present invention, the tibia-talar joint tibial component 1 includes two opposite surfaces, one of which is the distal tibia contact surface 12, and the other surface is provided with a rotational matching groove 14. In a preferred embodiment of the present invention, the size range of the tibiotalar joint tibial component 1 in the length direction can be 30-36 mm, the size range in the width direction can be 26-32 mm, and the size range in the height direction can be 8-10 mm. When describing the size range of each component, reference is made to the length direction, width direction and height direction of the talar split total ankle prosthesis. The length direction of the talar split total ankle prosthesis is consistent with the intersection of the distal tibial contact surface 12 and the rotational surface of the rotational mating component 2. The width direction of the talar split total ankle prosthesis is perpendicular to the length direction and consistent with the extension direction of the distal tibial contact surface 12. The height direction of the talar split total ankle prosthesis is determined according to its length direction and width direction according to the three-dimensional coordinate system.

[0053] In the talus split total ankle prosthesis provided by the present invention, Figure 2 , 5As shown, the calcaneal contact surface 211 can be a plane, and the calcaneal contact surface 211 is usually a rough surface. For example, the surface of the calcaneal contact surface 211 can be a porous coating, and the thickness of the porous coating on the surface of the calcaneal contact surface 211 can be 1.5-2 mm, the pore size can be 600-800 μm, and the porosity can be 70-80%. The second insert 212 can also be provided with a second fixing through hole 214 for connecting the second insert 212 and the calcaneus or its surrounding tissue, so that the calcaneus joint calcaneal side component 21 can be stably connected to the calcaneus as a whole. In a preferred embodiment of the present invention, the talar-meatal joint lateral component 21 is a cylindrical structure including six faces, four of which are sidewall faces of the cylindrical structure, one of the four sidewall faces of the cylindrical structure is a calcaneal contact face 211, another sidewall face is a contact face with the talonavicular joint lateral component 22, on which a positioning device may be provided, and another sidewall face is a contact face with the rotational matching groove 14, which is usually matched with the rotational matching groove 14, so as to ensure that the rotational matching groove 14 and the rotational matching part 2 are closely matched. In a preferred embodiment of the present invention, the size range of the talar-meatal joint lateral component 21 in the length direction may be 20-26 mm, the size range of the talar-meatal joint lateral component 21 in the width direction may be 23-28 mm, and the size range of the talar-meatal joint lateral component 21 in the height direction may be 28-32 mm.

[0054] In the talus split total ankle prosthesis provided by the present invention, Figure 2 , 4As shown, the navicular bone contact surface 221 can be a plane, and the navicular bone contact surface 221 is usually a rough surface. For example, the surface of the navicular bone contact surface 221 can be a porous coating, and the thickness of the porous coating on the surface of the navicular bone contact surface 221 can be 1.5-2 mm, the pore size can be 600-800 μm, and the porosity can be 70-80%. The third insert 222 can also be provided with a third fixing through hole 224 for connecting the navicular bone or its surrounding tissue, so that the talonavicular joint talar side component 22 and the navicular bone can be stably connected. In a preferred embodiment of the present invention, the talonavicular joint lateral component 22 is a cylindrical structure including five surfaces, three of which are side wall surfaces of the cylindrical structure, one of the three side wall surfaces of the cylindrical structure is the navicular bone contact surface 221, another side wall surface is the contact surface with the talonavicular joint lateral component 21, which may be provided with a positioning device, and another side wall surface is the contact surface with the rotational matching groove 14, which is usually matched with the rotational matching groove 14, so as to ensure that the rotational matching groove 14 and the rotational matching member 2 are closely matched. In a preferred embodiment of the present invention, the size range of the talonavicular joint lateral component 22 in the length direction can be 15-18 mm, the size range of the talonavicular joint lateral component 22 in the width direction can be 23-28 mm, and the size range of the talonavicular joint lateral component 22 in the height direction can be 28-32 mm.

[0055] In the talar split total ankle prosthesis provided by the present invention, the talar side component 21 of the talar joint and the talonavicular side component 22 can be connected by interference fit, so as to ensure a stable connection between the two. For example, the contact surfaces between the talar side component 21 of the talar joint and the talonavicular side component 22 can be provided with positioning devices, and the positioning devices can include a positioning piece 223 and a positioning groove 213; for another example, a positioning piece is provided on the contact surface between the talar side component of the talar joint and the talonavicular side component, and a positioning groove is provided on the contact surface between the talar side component of the talar joint and the talonavicular side component; for another example, a positioning groove is provided on the contact surface between the talar side component of the talar joint and the talonavicular side component, and a positioning piece is provided on the contact surface between the talar side component of the talar joint and the talonavicular side component. It also includes a process groove 23, which is located at the junction of the talar side component of the talocalcaneal joint and the talar side component of the talonavicular joint, preferably located at the non-inclusive part of the rotating mating part. With the help of the reserved process groove 23, when the prosthesis needs to be revised, the two press-fitted components can be separated using a tool that is compatible with the prosthesis, thereby facilitating the prosthesis revision.

[0056] The talus split total ankle prosthesis provided by the present invention can be prepared by 3D printing technology. The specific size of the prosthesis is individually determined based on the patient's imaging information through precise computer measurement. The material of the tibiotalar joint tibial component 1 can be high molecular polyethylene, and the material of the talar joint talar side component 21 and / or the talonavicular joint talar side component 22 can be titanium alloy.

[0057] The total ankle prosthesis with a talus split design provided by the present invention is easy to install during surgery, and solves many clinical problems such as difficulty in placing or improper installation of the prosthesis, severe damage to surrounding soft tissues during surgery, and even periprosthetic fractures caused by the large number of ligaments around the ankle, small surgical field of view, inability to fully expose the patient area, and insufficient surgical operation space. It has little damage to the ligaments and other tissues around the talus, can effectively save surgical time, and has good industrialization prospects.

[0058] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0059] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A talar split total ankle prosthesis, characterized in that: The invention comprises a tibiotalar joint tibial component (1), wherein the tibiotalar joint tibial component (1) comprises a first support portion (11), wherein a distal tibia contact surface (12) is provided on the first support portion (11), wherein a first inserting member (13) is provided on the distal tibia contact surface (12), wherein a rotational fitting groove (14) is provided on the side of the first support portion (11) opposite to the distal tibia contact surface (12), and further comprises a rotational fitting member (2), wherein the rotational fitting member (2) can be at least partially contained in the rotational fitting groove (14), wherein the rotational fitting member (2) comprises a detachably connected talocrural joint talar component (21) and a talonavicular joint talar component (22), wherein the talocrural joint talar component (21) and the talonavicular joint talar component (22) are connected by interference fit, wherein the rotational fitting member (21) and the talonavicular joint talar component (22) are connected by interference fit, wherein the rotational fitting member (22) and the talonavicular joint talar component (21) are connected by interference fit, wherein the rotational fitting member (22) and the talonavicular joint talar component (22) are connected by interference fit, wherein the rotational fitting member (21) and the talonavicular joint talar component (22) are connected by interference fit, wherein the rotational fitting member (22) and the talonavicular joint talar component (22) are connected by interference fit, wherein the rotational fitting member (2) and the talonavicular joint talar component (21) are connected by interference fit, wherein the rotational fitting member (2) and the talonavicular joint talar component (22) are connected by interference fit, wherein the rotational fitting member (2) and the talonavicular joint talar component (22) are connected by interference fit, wherein the rotational fitting member (2) and the The non-inclusive portion of the talon-side component (21) of the talon-talar joint is also provided with a calcaneal contact surface (211), and a second insert (212) is provided on the calcaneal contact surface (211); the non-inclusive portion of the talonavicular joint talon-side component (22) is also provided with a navicular contact surface (221), and a third insert (222) is provided on the navicular contact surface (221); the angle between the distal tibia contact surface (12) and the calcaneal contact surface (211) is 20 to 55 degrees, the angle between the distal tibia contact surface (12) and the navicular contact surface (221) is 22.5 to 57.5 degrees, the angle between the calcaneal contact surface (211) and the navicular contact surface (221) is 90 to 120 degrees, and the distal tibia contact surface (12) is a rough surface.

2. The talar split total ankle prosthesis according to claim 1, characterized in that: The distal tibia contact surface (12) is a plane, the distal tibia contact surface (12) is a rough surface, the surface of the distal tibia contact surface (12) is a porous coating, the thickness of the porous coating on the surface of the distal tibia contact surface (12) is 1.5 to 2 mm, the pore size is 600 to 800 μm, and the porosity is 70 to 80%; And / or, the calcaneal contact surface (211) is a plane, the calcaneal contact surface (211) is a rough surface, the surface of the calcaneal contact surface (211) is a porous coating, the thickness of the porous coating on the surface of the calcaneal contact surface (211) is 1.5 to 2 mm, the pore size is 600 to 800 μm, and the porosity is 70 to 80%; And / or, the navicular bone contact surface (221) is a plane, the navicular bone contact surface (221) is a rough surface, the surface of the navicular bone contact surface (221) is a porous coating, the porous coating on the surface of the navicular bone contact surface (221) has a thickness of 1.5 to 2 mm, a pore size of 600 to 800 μm, and a porosity of 70 to 80%.

3. The talar split total ankle prosthesis according to claim 1, characterized in that: The rotational matching groove (14) is a rectangular groove with rounded bottom corners, and the shape of the containing portion of the rotational matching member (2) matches the rotational matching groove (14); And / or, the first insert (13) is provided with a first fixing through hole (15); And / or, the second insert (212) is provided with a second fixing through hole (214); And / or, the third insert (222) is provided with a third fixing through hole (224).

4. The talar split total ankle prosthesis according to claim 1, characterized in that: The rotation angle of the rotating fitting (2) is ≤35°.

5. The talar split total ankle prosthesis according to claim 1, characterized in that: The angle between the rotating surface of the rotating fitting (2) and the tibia distal end contact surface (12) is 85-90 degrees.

6. The talar split total ankle prosthesis according to claim 1, characterized in that: Positioning devices are respectively provided on the contact surfaces between the talar-talar joint talar-side component (21) and the talonavicular joint talar-side component (22), and the positioning devices include a positioning member (223) and a positioning groove (213).

7. The talar split total ankle prosthesis according to claim 6, characterized in that: It also includes a process groove (23), which is located at the junction of the talar side component of the talocalcaneal joint and the talar side component of the talonavicular joint.

8. The talar split total ankle prosthesis according to claim 1, characterized in that: The talus split total ankle prosthesis is prepared by 3D printing technology; and / or, the material of the tibiotalar joint tibial component (1) is selected from polyethylene; And / or, the material of the talar side component (21) of the talocalcaneal joint and / or the talonavicular side component (22) of the talonavicular joint is selected from titanium alloy.

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