CN116687626A

CN116687626A - Talus repair prosthesis

Info

Publication number: CN116687626A
Application number: CN202310777011.XA
Authority: CN
Inventors: 马骏
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2023-06-28
Filing date: 2023-06-28
Publication date: 2023-09-05

Abstract

The present application provides a talus repair prosthesis comprising: a prosthesis body; a talar cap, the cap being provided on the prosthesis body, the shape of the talar cap being adapted to the shape of the prosthesis body; and a height adjusting member disposed between the prosthesis body and the talus cover, the height adjusting member being capable of adjusting a distance between the prosthesis body and the talus cover. The technical scheme provided by the application can solve the problems that the surface of the prosthesis in the related technology is not well matched with the talus joint surface, and the load and normal movement of the ankle joint are affected.

Description

Talus repair prosthesis

Technical Field

The application relates to the technical field of prostheses, in particular to a talus repair prosthesis.

Background

Cartilage damage to the talus is one of the common ankle diseases of talus articular surfaces or subchondral bone formation damage, often resulting in ankle pain, osteoarthritis or disability, affecting the patient's daily life. For patients who are not refractory to conservative treatment or who meet surgical indications, surgical treatment should be selected. For patients with cartilage damage to the talus bone associated with larger cystic lesions, treatment methods such as implantation of implants are common.

In the related art, the treatment using the implant may be performed using autologous osteochondral implantation, however, this method has problems of cyst recurrence and donor area complications after operation. In addition, autologous bone is easily absorbed, the supporting effect is not strong, and the transplanting effect is not good. In recent years, a prosthetic made of a metal material has been used to fill the talus defect after removal of a large lesion. The treatment method is to use a bone-taking tool to remove the focus and surrounding bone, and then implant a metal repair body to fill the bone defect.

However, since the articular surface of the talus is an irregularly curved surface structure, it is difficult to accurately measure the height of the bone defect after removing the lesion, and it is likely that the prosthesis is higher or lower than the articular surface of the talus itself after implantation, resulting in poor matching of the surface of the prosthesis with the articular surface of the talus after implantation, affecting the load and normal movement of the ankle.

Disclosure of Invention

The application provides a talus repair prosthesis, which aims to solve the problems that the surface of the prosthesis in the related art is not well matched with the surface of a talus joint, and the load and normal movement of an ankle joint are affected.

The present application provides a talus repair prosthesis comprising: a prosthesis body; a talar cap, the cap being provided on the prosthesis body, the shape of the talar cap being adapted to the shape of the prosthesis body; and a height adjusting member disposed between the prosthesis body and the talus cover, the height adjusting member being capable of adjusting a distance between the prosthesis body and the talus cover.

Further, the height adjusting member includes a first adjusting section and a second adjusting section, both extending vertically, the first adjusting section being provided on an upper surface of the prosthesis body, the second adjusting section being provided on a lower surface of the talus cap, a distance between the first adjusting section and the second adjusting section being adjustable.

Further, the height adjusting piece further comprises an adjusting sleeve, two ends of the adjusting sleeve are respectively connected with the first adjusting section and the second adjusting section, and/or the distance between the first adjusting section and the adjusting sleeve is adjustable, and/or the distance between the second adjusting section and the adjusting sleeve is adjustable.

Further, the adjusting sleeve is provided with internal threads, the first adjusting section is provided with external threads, and the adjusting sleeve is sleeved on the periphery of the first adjusting section and is in threaded connection with the first adjusting section.

Further, the adjusting sleeve is provided with a conical inner hole, the second adjusting section is a conical section, the cross section sizes of the conical inner hole and the conical section gradually decrease in the direction from top to bottom, and the conical section is inserted into the conical inner hole.

Further, the prosthesis body has a receiving cavity, the first adjustment section and the adjustment sleeve are both disposed within the receiving cavity, the lower end of the second adjustment section extends into the receiving cavity, and the talar cap covers over the receiving cavity.

Further, the prosthesis body comprises a base plate and an annular coaming arranged at the outer edge of the base plate, the base plate and the annular coaming jointly enclose a containing cavity, the first adjusting section is arranged on the upper surface of the base plate, the talus cover is arranged on the annular coaming, and the talus cover is matched with the annular coaming in shape.

Further, the talar repair prosthesis further comprises a rotation stopping structure arranged between the prosthesis main body and the talar cover, the rotation stopping structure comprises a rotation stopping protrusion and a rotation stopping groove which are matched in a rotation stopping mode, one of the rotation stopping protrusion and the rotation stopping groove is arranged on the lower surface of the talar cover, and the other of the rotation stopping protrusion and the rotation stopping groove is arranged on the prosthesis main body.

Further, the talar repair prosthesis further comprises a coupling screw by which the prosthesis body is coupled to the talus.

Further, the connecting screw comprises a first thread section and a second thread section which are connected, the prosthesis main body is provided with a threaded hole which is arranged in a penetrating mode, the first thread section is connected with the threaded hole, the second thread section is connected with the talus, and the cross section sizes of the first thread section and the threaded hole are gradually reduced in the direction from top to bottom.

Further, the upper surface of the talar cover is a curved surface structure matched with the talar; and/or the outer surface of the prosthesis body has a porous structure.

When the talar repair prosthesis is applied, the prosthesis main body is placed in a human talus and connected with the talus, the talus cover is arranged on the prosthesis main body, and the distance between the prosthesis main body and the talus cover is adjusted by utilizing the height adjusting piece, so that the upper surface of the talus cover can be matched with the surface height of the talus, and the implanted talus repair prosthesis can be matched with the joint surface of the talus without influencing the load and normal movement of an ankle joint.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 shows a cross-sectional view of a talar repair prosthesis provided in accordance with an embodiment of the present application;

FIG. 2 shows a schematic structural view of a talus repair prosthesis provided in accordance with an embodiment of the present application;

FIG. 3 shows a schematic structural view of a prosthetic body of a talus repair prosthesis provided in accordance with an embodiment of the present application;

FIG. 4 shows a schematic view of the structure of a talar cap of a talar repair prosthesis provided in accordance with an embodiment of the application;

FIG. 5 illustrates a cross-sectional view of an adjustment sleeve of a talar repair prosthesis provided in accordance with an embodiment of the present application;

fig. 6 shows a schematic structural view of a connection screw of a talus repair prosthesis according to an embodiment of the present application.

Wherein the above figures include the following reference numerals:

10. a prosthesis body; 11. a receiving chamber; 12. a bottom plate; 13. an annular coaming; 14. a threaded hole;

20. a talar cap;

30. a height adjusting member; 31. a first adjustment section; 32. a second adjustment section; 33. an adjustment sleeve; 331. a tapered bore;

40. a rotation stopping structure; 41. a rotation stopping protrusion; 42. a rotation stopping groove;

50. a connecting screw; 51. a first thread segment; 52. a second thread segment.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

As shown in fig. 1 to 6, the embodiment of the present application provides a talar repair prosthesis comprising a prosthesis body 10, a talar cap 20, and a height adjuster 30, the talar cap 20 being provided on the prosthesis body 10, the shape of the talar cap 20 being adapted to the shape of the prosthesis body 10; a height adjuster 30 is provided between the prosthesis body 10 and the talar cover 20, the height adjuster 30 being capable of adjusting the distance between the prosthesis body 10 and the talar cover 20.

When the talar repair prosthesis is applied, the prosthesis body 10 is placed in a human talus and connected with the talus, the talus cover 20 is covered on the prosthesis body 10, and the distance between the prosthesis body 10 and the talus cover 20 is adjusted by the height adjusting piece 30 so that the upper surface of the talus cover 20 can be matched with the surface height of the talus, thereby enabling the implanted talar repair prosthesis to be matched with the surface of a talus joint without affecting the load and normal activities of an ankle joint.

In practice, larger lesions are removed from the human talus scooter surface, creating a groove structure that can be filled with the prosthesis body 10 to repair the talus.

Wherein the shape of the talar cap 20 is adapted to the shape of the prosthesis body 10, it is meant that the outer side wall of the talar cap 20 is adapted to the shape of the outer side wall of the prosthesis body 10.

As shown in fig. 1, 3 and 4, the height adjusting member 30 includes a first adjusting section 31 and a second adjusting section 32, each extending vertically, the first adjusting section 31 being provided on the upper surface of the prosthesis body 10, the second adjusting section 32 being provided on the lower surface of the talar cover 20, and the distance between the first adjusting section 31 and the second adjusting section 32 being adjustable. The height adjusting piece 30 adopting the structure has the advantages of simple structure and convenient processing and adjustment.

Wherein, in an embodiment, through setting up to the structure of grafting cooperation between first adjustment section 31 and the second adjustment section 32, for example, insert first adjustment section 31 to second adjustment section 32 on, and set up limit structure between first adjustment section 31 and second adjustment section 32, limit structure can include spacing protruding and a plurality of spacing groove, spacing protruding setting is on one of first adjustment section 31 and second adjustment section 32, a plurality of spacing grooves set up on the other of first adjustment section 31 and second adjustment section 32, a plurality of spacing grooves set up along the length direction interval of first adjustment section 31, through making spacing protruding and any one of them spacing groove spacing cooperation, realize the distance adjustment between first adjustment section 31 and the second adjustment section 32.

The first adjusting section 31 is configured to be elastically deformable, for example, a plurality of deformation grooves are formed in the first adjusting section 31, and the plurality of deformation grooves are disposed at intervals along the circumferential direction of the first adjusting section 31.

In this embodiment, the first adjustment section 31 and the second adjustment section 32 are both in a columnar structure.

Specifically, the distance between the first adjustment section 31 and the second adjustment section 32 is adjusted by the adjustment sleeve 33.

As shown in fig. 1 and 5, the height adjusting member 30 further includes an adjusting sleeve 33, both ends of the adjusting sleeve 33 are respectively connected with the first adjusting section 31 and the second adjusting section 32, and a distance between the first adjusting section 31 and the adjusting sleeve 33 is adjustable, or a distance between the second adjusting section 32 and the adjusting sleeve 33 is adjustable. The distance between the first adjusting section 31 and the second adjusting section 32 is adjusted by adopting the adjusting sleeve 33, and the adjusting sleeve has the advantages of simple structure and convenience in adjustment.

Wherein, the two ends of the adjusting sleeve 33 are respectively in plug-in fit with the first adjusting section 31 and the second adjusting section 32.

As shown in fig. 1 and 5, the adjusting sleeve 33 is provided with an internal thread, the first adjusting section 31 is provided with an external thread, and the adjusting sleeve 33 is sleeved on the outer circumference of the first adjusting section 31 and is in threaded connection with the first adjusting section 31. The threaded connection mode is adopted, and the threaded connection device has the advantages of being simple in connection structure and convenient to adjust.

Specifically, by adjusting the connection distance of the external screw thread and the internal screw thread, the distance between the first adjustment section 31 and the second adjustment section 32 can be adjusted.

Wherein the length of the internal thread is between 1mm and 20 mm. In this embodiment, the length of the internal thread is 10mm.

As shown in fig. 1 and 5, the adjustment sleeve 33 has a tapered inner bore 331, the second adjustment section 32 is a tapered section, and the cross-sectional dimensions of the tapered inner bore 331 and the tapered section gradually decrease in the top-to-bottom direction, and the tapered section is inserted into the tapered inner bore 331. The conical section and the conical inner hole 331 are adopted for being in plug-in fit, and the connecting structure has the advantages of being simple in connecting structure and stable in connection.

In this embodiment, the height of the conical section is 10mm.

In this embodiment, the internal thread communicates with the tapered bore 331, which in turn reduces the height dimension of the adjustment sleeve 33.

Wherein a transition structure is provided between the conical section and the talar cap 20 to transition the lower surface of the irregular talar cap 20 to a planar structure for ease of machining, facilitating connection of the conical section to the talar cap 20.

As shown in fig. 3, the prosthesis body 10 has a receiving cavity 11, a first adjustment section 31 and an adjustment sleeve 33 are each disposed in the receiving cavity 11, the lower end of the second adjustment section 32 extends into the receiving cavity 11, and the talar cap 20 covers over the receiving cavity 11. By providing the accommodation chamber 11 with the height adjusting pieces 30 all being provided in the accommodation chamber 11, the height adjusting pieces 30 can be protected.

As shown in fig. 3, the prosthesis body 10 comprises a base plate 12 and an annular surrounding plate 13 arranged at the outer edge of the base plate 12, the base plate 12 and the annular surrounding plate 13 together enclose a receiving cavity 11, a first adjustment section 31 is arranged on the upper surface of the base plate 12, a talar cap 20 is arranged on the annular surrounding plate 13 in a covering manner, and the talar cap 20 is adapted to the shape of the annular surrounding plate 13. The prosthesis body 10 adopting the structure has the advantages of simple structure and convenient processing.

In this embodiment, the talar cap 20 may be supported by providing an annular shroud 13 to enhance the strength of the talar repair prosthesis.

As shown in fig. 3 and 4, the talar repair prosthesis further comprises a rotation stopping structure 40 provided between the prosthesis body 10 and the talar cap 20, the rotation stopping structure 40 comprising rotation stopping protrusions 41 and rotation stopping grooves 42 which are rotation stopping fitted, one of the rotation stopping protrusions 41 and the rotation stopping grooves 42 being provided on the lower surface of the talar cap 20, and the other of the rotation stopping protrusions 41 and the rotation stopping grooves 42 being provided on the prosthesis body 10. With the rotation stopping structure 40, the rotation stopping protrusion 41 and the rotation stopping groove 42 can be used for stopping rotation, so that the talus cover 20 cannot rotate relative to the prosthesis main body 10, and the connection between the two parts is more stable.

In the present embodiment, the tapered section can be rotated with respect to the tapered inner bore 331 after adjusting the distance between the female screw and the male screw so that the rotation stopping protrusion 41 can be inserted in the rotation stopping groove 42.

As shown in fig. 1 and 6, the talar repair prosthesis further includes a coupling screw 50, and the prosthesis body 10 is coupled to the talus by the coupling screw 50. The connection mode of connecting the prosthesis body 10 with the talus by using the connection screw 50 has the advantages of simple connection structure and convenient operation.

As shown in fig. 6, the coupling screw 50 includes a first threaded section 51 and a second threaded section 52 connected to each other, the prosthesis body 10 has a threaded hole 14 provided therethrough, the first threaded section 51 is connected to the threaded hole 14, the second threaded section 52 is connected to the talus, and the cross-sectional dimensions of the first threaded section 51 and the threaded hole 14 are gradually reduced in the top-to-bottom direction. By adopting the connection mode, the connecting device has the advantage of stable connection.

Specifically, the connection stability of the connection screw 50 and the prosthesis body 10 can be enhanced by connecting the first screw thread section 51 with the screw hole 14, and the connection stability of the connection screw 50 and the talus can be enhanced by connecting the second screw thread section 52 with the talus.

Positioning of the connecting screw 50 for its installation is facilitated by arranging the first threaded section 51 and the threaded bore 14 in such a way that the cross-sectional dimensions are gradually reduced.

As shown in fig. 4, the upper surface of the talar cover 20 has a curved surface structure adapted to the talus, and the above curved surface structure can be used to adapt the talar cover 20 to the human talus.

In this embodiment, the outer surface of the prosthesis body 10 has a porous structure. The use of a porous structure facilitates bone ingrowth to enhance the initial stability of the talar repair prosthesis.

Wherein the thickness of the porous structure may be between 50 μm and 900 μm, in this embodiment the thickness of the porous structure is 400 μm.

The height of the talus repair prosthesis is adjusted by the height adjusting piece 30, so that the talus repair prosthesis can be well matched with the defect height of the original defect part. The attachment screw 50 secures the prosthesis body 10 to the talar defect site through the threaded bore 14 of the prosthesis body 10, resulting in a stable initial fixation. The porous structure facilitates bone ingrowth into the talus, allowing the prosthesis body 10 to form a long-term stable fixation with the talus.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A talus repair prosthesis, the talus repair prosthesis comprising:

a prosthesis body (10);

-a talar cap (20) provided on the prosthesis body (10), the shape of the talar cap (20) being adapted to the shape of the prosthesis body (10);

a height adjustment member (30) disposed between the prosthesis body (10) and the talar cap (20), the height adjustment member (30) being capable of adjusting a distance between the prosthesis body (10) and the talar cap (20).

2. A talus repair prosthesis according to claim 1, characterized in that the height adjustment member (30) comprises a first adjustment section (31) and a second adjustment section (32) each extending vertically, the first adjustment section (31) being provided at an upper surface of the prosthesis body (10), the second adjustment section (32) being provided at a lower surface of the talus cap (20), the distance between the first adjustment section (31) and the second adjustment section (32) being adjustable.

3. A talus repair prosthesis according to claim 2, characterized in that the height adjustment member (30) further comprises an adjustment sleeve (33), both ends of the adjustment sleeve (33) being connected to the first adjustment section (31) and the second adjustment section (32), respectively, the distance between the first adjustment section (31) and the adjustment sleeve (33) being adjustable, and/or the distance between the second adjustment section (32) and the adjustment sleeve (33) being adjustable.

4. A talus repair prosthesis according to claim 3, characterized in that the adjustment sleeve (33) is provided with an internal thread, the first adjustment section (31) is provided with an external thread, and the adjustment sleeve (33) is sleeved on the outer circumference of the first adjustment section (31) and is in threaded connection with the first adjustment section (31).

5. A talus repair prosthesis according to claim 3, characterized in that the adjustment sleeve (33) has a conical inner bore (331), the second adjustment section (32) being a conical section, the cross-sectional dimensions of the conical inner bore (331) and the conical section decreasing in the top-down direction, the conical section being inserted in the conical inner bore (331).

6. A talar repair prosthesis according to claim 3, characterized in that the prosthesis body (10) has a receiving cavity (11), the first adjustment section (31) and the adjustment sleeve (33) being both arranged in the receiving cavity (11), the lower end of the second adjustment section (32) extending into the receiving cavity (11), the talar cap (20) covering over the receiving cavity (11).

7. A talar repair prosthesis according to claim 6, characterized in that the prosthesis body (10) comprises a base plate (12) and an annular collar (13) arranged at the outer edge of the base plate (12), the base plate (12) and the annular collar (13) together enclosing the receiving cavity (11), the first adjustment section (31) being arranged at the upper surface of the base plate (12), the talar cap (20) being arranged over the annular collar (13), the talar cap (20) being adapted to the shape of the annular collar (13).

8. A talar repair prosthesis according to claim 1, further comprising a rotation stopping structure (40) arranged between the prosthesis body (10) and the talar cap (20), the rotation stopping structure (40) comprising rotation stopping protrusions (41) and rotation stopping grooves (42) of a rotation stopping fit, one of the rotation stopping protrusions (41) and the rotation stopping grooves (42) being arranged on a lower surface of the talar cap (20), the other of the rotation stopping protrusions (41) and the rotation stopping grooves (42) being arranged on the prosthesis body (10).

9. A talus repair prosthesis according to claim 1, characterized in that the talus repair prosthesis further comprises a connection screw (50), the prosthesis body (10) being connected to the talus by means of the connection screw (50).

10. A talus repair prosthesis according to claim 9, characterized in that the connecting screw (50) comprises a first threaded section (51) and a second threaded section (52) connected, the prosthesis body (10) having a threaded hole (14) provided therethrough, the first threaded section (51) being connected to the threaded hole (14), the second threaded section (52) being connected to the talus, the first threaded section (51) and the threaded hole (14) each decreasing in cross-sectional dimension in the top-to-bottom direction.

11. A talus repair prosthesis according to claim 1, characterized in that,

the upper surface of the talus cover (20) is a curved surface structure matched with the talus; and/or the number of the groups of groups,

the outer surface of the prosthesis body (10) has a porous structure.