Hip prosthesis

Abstract

The present invention provides a hip joint prosthesis, which comprises: a proximal end portion of a femoral stem; an extension stem; a filling member disposed between the proximal end portion of the femoral stem and the extension stem to connect the proximal end portion of the femoral stem and the extension stem; and a height adjustment assembly, at least a part of which is disposed between the proximal end portion of the femoral stem and the filling member and is telescopically arranged to adjust the height of the hip joint prosthesis by adjusting the distance between the proximal end portion of the femoral stem and the extension stem. This hip joint prosthesis solves the problem that the relative position between the filling block and the prosthesis in the prior art is fixed.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and more particularly, to a hip prosthesis. Background Art

[0002] With the popularization of total hip arthroplasty, the ratio of total hip revision is gradually increasing. When performing revision, the prosthesis of the primary replacement, that is, the diseased bone, needs to be removed. There will be a certain degree of bone defect at the hip joint, and the location and degree of the bone defect vary from person to person.

[0003] Currently, to solve the bone defect problem, generally a revision prosthesis plus a filling block for filling the bone defect position is used. The current specifications of the filling blocks are relatively single, and they cannot well adapt to the size of the bone defect. Moreover, the relative position between the filling block and the prosthesis is fixed, and the severity and height of the bone defect vary from person to person.

[0004] Therefore, the conventional filling blocks cannot meet the needs of each patient. Currently, there are also companies that can customize filling blocks for patients, that is, make customized filling blocks that are only suitable for that patient according to the bone defect CT of the patient. The advantage is that it perfectly matches the patient's bone defect, but the disadvantages are high price, long customization cycle, and lack of universality. Summary of the Invention

[0005] The main object of the present invention is to provide a hip prosthesis to solve the problem that the relative position between the filling block and the prosthesis in the prior art is fixed.

[0006] To achieve the above object, the present invention provides a hip prosthesis, which includes: a proximal end portion of a femoral stem; an extension stem; a filling member disposed between the proximal end portion of the femoral stem and the extension stem to connect the proximal end portion of the femoral stem and the extension stem; a height adjustment assembly, at least a part of which is disposed between the proximal end portion of the femoral stem and the filling member and is telescopically disposed to adjust the height of the hip prosthesis by adjusting the distance between the proximal end portion of the femoral stem and the extension stem.

[0007] Further, the height adjustment assembly includes: a first adjustment member and a second adjustment member. The first adjustment member is disposed on the proximal end portion of the femoral stem, and the second adjustment member is disposed on the filling member. The first adjustment member is adjustably disposed relative to the second adjustment member so that at least a part of the height adjustment assembly is telescopically disposed.

[0008] Further, the first adjustment member and the second adjustment member are connected by a mutually cooperating groove portion and a protrusion portion.

[0009] Further, the first adjusting member is rotatably connected to the proximal end portion of the femoral stem, or the second adjusting member is rotatably connected to the filling member, so that when the first adjusting member and the second adjusting member rotate relative to each other, the convex portion is inserted into the concave portion or disengaged from the concave portion.

[0010] Further, the first adjusting member is integrally formed with the proximal end portion of the femoral stem, or the first adjusting member is detachably mounted on the proximal end portion of the femoral stem.

[0011] Further, the second adjusting member is integrally formed with the filling member, or the second adjusting member is detachably mounted on the filling member.

[0012] Further, a first mounting groove is provided on the proximal end portion of the femoral stem, and at least a part of the first adjusting member is detachably mounted in the first mounting groove; a second mounting groove is provided on the filling member, and at least a part of the second adjusting member is detachably mounted in the second mounting groove.

[0013] Further, the first adjusting member includes a first mounting portion and a first connecting portion, and the first mounting portion is engaged with the first mounting groove to be fixedly mounted in the first mounting groove; the second adjusting member includes a second mounting portion and a second connecting portion, and the second mounting portion is engaged with the second mounting groove to be rotatably mounted in the second mounting groove; wherein, the first connecting portion and the second connecting portion are connected by a concave portion and a convex portion that cooperate with each other.

[0014] Further, the concave portion is provided on the first connecting portion, and the convex portion is provided on the second connecting portion.

[0015] Further, both the first connecting portion and the second connecting portion are multiple, the multiple first connecting portions and the multiple second connecting portions are arranged in one-to-one correspondence, and the multiple first connecting portions and the multiple second connecting portions are all arranged at intervals along the rotation direction of the second mounting portion.

[0016] Further, a retaining portion is provided on the concave portion. After the convex portion extends into the concave portion, the retaining portion stops on one side of the convex portion to prevent the convex portion from rotating back.

[0017] Further, the retaining portion includes a transition surface, a retaining surface and a connecting surface that are connected in sequence. The connecting surface is connected to the groove surface of the concave portion. The transition surface is an arc surface or an inclined surface inclined to the retaining surface. The retaining surface is arranged towards the direction in which the convex portion extends into the concave portion, so as to stop the convex portion through the retaining surface when the convex portion moves from one side of the retaining portion to the other side of the retaining portion.

[0018] Further, both the convex portion and the concave portion are multiple, and the multiple convex portions and the multiple concave portions are all arranged along the telescopic direction of the height adjusting assembly.

[0019] Further, a first positioning portion is provided on the proximal end of the femoral stem, a first positioning groove is provided on the filling member, and the first positioning portion is inserted into the first positioning groove; and / or, a second positioning portion is provided on the extension stem, a second positioning groove is provided on the filling member, and the second positioning portion is inserted into the second positioning groove.

[0020] Applying the technical solution of the present invention, the distance between the proximal end of the femoral stem and the extension stem is used to adjust the overall height of the hip joint prosthesis, and the position of the filling member relative to the entire prosthesis can be adjusted, thereby solving the problem that the position of the filling member of the hip joint prosthesis in the prior art is relatively fixed in the entire prosthesis, and thus the problem of incomplete matching of the prosthesis caused by reasons such as leg length differences of patients can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0022] Figure 1 shows a schematic structural diagram of an embodiment of a hip joint prosthesis according to the present invention;

[0023] Figure 2 shows a schematic structural diagram of an embodiment of the proximal end of the femoral stem of a hip joint prosthesis according to the present invention;

[0024] Figure 3 shows a cross-sectional view of the proximal end of the femoral stem of a hip joint prosthesis according to the present invention;

[0025] Figure 4 shows a schematic structural diagram of an embodiment of the filling member of a hip joint prosthesis according to the present invention;

[0026] Figure 5 shows a cross-sectional view of the filling member of a hip joint prosthesis according to the present invention;

[0027] Figure 6 shows a schematic structural diagram of an embodiment of the height adjustment assembly of a hip joint prosthesis according to the present invention;

[0028] Figure 7 shows Figure 6 a schematic structural diagram of the first adjusting member of the height adjustment assembly in

[0029] Figure 8 shows Figure 6 a schematic structural diagram of the second adjusting member of the height adjustment assembly in

[0030] Figure 9 shows a schematic structural diagram of an embodiment of the extension stem of a hip joint prosthesis according to the present invention;

[0031] Figure 10 shows the Figure 9 bottom view of the extension stem of the hip prosthesis in

[0032] Wherein, the above-mentioned drawings include the following reference numerals:

[0033] 10, proximal end of the femoral stem; 30, height adjustment assembly; 40, filling member; 50, extension stem; 11, first installation groove; 12, first positioning portion; 41, filling side; 42, shoulder cutting side; 43, first positioning groove; 45, second positioning groove; 46, second installation groove; 31, first adjusting member; 32, second adjusting member; 311, first installation portion; 312, opening groove; 313, first connecting portion; 314, anti-back-off portion; 33, groove portion; 34, protruding portion; 322, second connecting portion; 321, second installation portion; 51, second positioning portion; 53, anti-rotation ridge; 521, cross tuning fork. Detailed implementation manners

[0034] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0035] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the implementation manners of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these process, method, product or device.

[0037] The present invention provides a hip prosthesis, please refer to Figures 1 to 10, the hip joint prosthesis is a height-adjustable hip joint prosthesis, which includes a proximal end portion 10 of the femoral stem, a height adjustment assembly 30, a filling member 40, and an extension stem 50. The proximal end portion 10 of the femoral stem is disposed at the top of the entire prosthesis for connection with the femoral stem, the extension stem 50 is disposed at the bottom of the prosthesis for connection with the femoral medullary cavity, and the filling member 40 is disposed between the proximal end portion 10 of the femoral stem and the extension stem 50 to connect the proximal end portion 10 of the femoral stem and the extension stem 50; at least a part of the height adjustment assembly 30 is disposed between the proximal end portion 10 of the femoral stem and the filling member 40 and is telescopically disposed to adjust the overall height of the hip joint prosthesis by adjusting the distance between the proximal end portion 10 of the femoral stem and the extension stem 50.

[0038] In this application, the overall height of the hip joint prosthesis mentioned refers to the distance from the top end of the proximal end portion 10 of the femoral stem to the distal end of the extension stem 50. Among them, the top end of the proximal end portion 10 of the femoral stem refers to the end of the proximal end portion 10 of the femoral stem away from the filling member 40, and the distal end of the extension stem 50 refers to the end of the extension stem 50 away from the filling member 40. In this way, by adjusting this distance, the position of the filling member 40 relative to the entire prosthesis can be adjusted, thereby solving the problem that the position of the filling member 40 of the hip joint prosthesis in the prior art is relatively fixed in the entire prosthesis, and thus the problem of incomplete matching of the prosthesis caused by reasons such as the difference in the leg lengths of patients can be solved.

[0039] The specific structure of the height adjustment assembly 30 in this embodiment is as Figures 6 to 8 shown. The height adjustment assembly 30 includes a first adjustment member 31 and a second adjustment member 32. The first adjustment member 31 is disposed on the proximal end portion 10 of the femoral stem, and the second adjustment member 32 is disposed on the filling member 40. The first adjustment member 31 is disposed in a position-adjustable manner relative to the second adjustment member 32 so that at least a part of the height adjustment assembly 30 is telescopically disposed.

[0040] It can be seen that in this embodiment, by providing the first adjustment member 31 and the second adjustment member 32 and by making the relative position between the first adjustment member 31 and the second adjustment member 32 adjustable, at least a part of the height adjustment assembly 30 can be telescopically disposed. Using the height adjustment assembly in this embodiment, the overall height of the hip joint prosthesis can be adjusted within the range of the sum of the heights of the first adjustment member 31 and the second adjustment member 32.

[0041] To achieve the mutual cooperation between the first adjustment member 31 and the second adjustment member 32, as Figure 7 and Figure 8As shown, the first adjusting member 31 and the second adjusting member 32 are connected by a mutually cooperating groove portion 33 and a protrusion portion 34. By adopting a structure in which the groove portion 33 and the protrusion portion 34 cooperate with each other between the first adjusting member 31 and the second adjusting member 32, the relative position between the first adjusting member 31 and the second adjusting member 32 can be fixed by inserting the protrusion portion 34 into the groove portion 33.

[0042] In this embodiment, the first adjusting member 31 is rotatably connected to the proximal end portion 10 of the femoral stem, or the second adjusting member 32 is rotatably connected to the filling member 40, so that when the first adjusting member 31 and the second adjusting member 32 rotate relative to each other, the protrusion portion 34 is inserted into the groove portion 33 or disengaged from the groove portion 33.

[0043] The setting manner between the first adjusting member 31 and the proximal end portion 10 of the femoral stem in this embodiment is: the first adjusting member 31 and the proximal end portion 10 of the femoral stem are integrally formed, or the first adjusting member 31 is detachably mounted on the proximal end portion 10 of the femoral stem.

[0044] The setting manner between the second adjusting member 32 and the filling member 40 in this embodiment is: the second adjusting member 32 and the filling member 40 are integrally formed, or the second adjusting member 32 is detachably mounted on the filling member 40.

[0045] Specifically, the first adjusting member 31 and the proximal end portion 10 of the femoral stem are integrally formed, and the second adjusting member 32 is rotatably mounted on the filling member 40; or, the second adjusting member 32 and the filling member 40 are integrally formed, and the first adjusting member 31 is rotatably mounted on the proximal end portion 10 of the femoral stem; or, both the first adjusting member 31 and the second adjusting member 32 are detachably mounted on the proximal end portion 10 of the femoral stem and the filling member 40, and the first adjusting member 31 is rotatably connected to the proximal end portion 10 of the femoral stem or the second adjusting member 32 is rotatably connected to the filling member 40. Through this setting, the processing process of the prosthesis can be facilitated, and the stability of the integrally formed part can be improved.

[0046] As Figure 2 、 3 、5 shown, a first mounting groove 11 is provided on the proximal end portion 10 of the femoral stem, and at least a part of the first adjusting member 31 is detachably mounted in the first mounting groove 11; a second mounting groove 46 is provided on the filling member 40, and at least a part of the second adjusting member 32 is detachably mounted in the second mounting groove 46. By arranging the height adjusting assembly 30 between the proximal end portion 10 of the femoral stem and the filling member 40, on the one hand, the structural layout of the prosthesis is optimized, ensuring the strength of each component, and on the other hand, the height adjustment is also convenient to operate.

[0047] As [[ID=As shown, the first adjusting member 31 includes a first mounting portion 311 and a first connecting portion 313. The first mounting portion 311 is engaged with the first mounting groove 11 to be fixedly mounted therein; the second adjusting member 32 includes a second mounting portion 321 and a second connecting portion 322. The second mounting portion 321 is engaged with the second mounting groove 46 to be rotatably mounted therein; wherein, the first connecting portion 313 and the second connecting portion 322 are connected by a mutually engaged groove portion 33 and a protrusion portion 34.

[0048] Specifically, the groove portion 33 is provided on the first connecting portion 313, and the protrusion portion 34 is provided on the second connecting portion 322. Both the first connecting portion 313 and the second connecting portion 322 are multiple. The multiple first connecting portions 313 and the multiple second connecting portions 322 are arranged in one-to-one correspondence, and the multiple first connecting portions 313 and the multiple second connecting portions 322 are both arranged at intervals along the rotation direction of the second mounting portion 321.

[0049] In addition, both the protrusion portion 34 and the groove portion 33 are multiple, and the multiple groove portions 33 and the multiple protrusion portions 34 are both arranged in sequence along the telescopic direction of the height adjusting assembly 30.

[0050] In order to achieve the stop of the protrusion portion 34, a backstop portion 314 is provided on the groove portion 33. After the protrusion portion 34 extends into the groove portion 33, the backstop portion 314 stops on one side of the protrusion portion 34 to prevent the protrusion portion 34 from rotating back. In this way, when the height of the hip joint prosthesis is determined, during the installation and use of the prosthesis, the first adjusting member 31 and the second adjusting member 32 will no longer rotate relative to each other, thereby ensuring the safety of the prosthesis during use.

[0051] Specifically, the backstop portion 314 includes a transition surface, a stop surface, and a connecting surface that are connected in sequence. The connecting surface is connected to the groove surface of the groove portion 33. The transition surface is an arc surface or an inclined surface inclined to the stop surface. The stop surface is arranged facing the direction in which the protrusion portion 34 extends into the groove portion 33, so as to stop the protrusion portion 34 through the stop surface when the protrusion portion 34 moves from one side of the backstop portion 314 to the other side of the backstop portion 314.

[0052] In this embodiment, a ring structure is provided on one side of the first mounting portion 311. The ring structure is divided into multiple arc-shaped portions by a plurality of opening grooves 312, and each arc-shaped portion is the first connecting portion 313. A columnar structure is provided on one side of the second mounting portion 321. A plurality of protruding structures protruding radially along the columnar structure are provided on the outer side of the columnar structure, and each protruding structure is the second connecting portion 322. The multiple second connecting portions 322 are arranged circumferentially around the columnar structure.

[0053] When the convex part 34 is transferred from the opening groove 312 to the groove part 33, the surface of the convex part 34 will first contact and press against the transition surface. After the convex part 34 is completely screwed into the groove part 33, the end of the convex part 34 will be stuck into the groove part 33 and dock with the stop surface to play a role in preventing retraction.

[0054] After the entire prosthesis is assembled, the height can be adjusted at any time. Through manual operation, first insert the second connecting part 322 into the opening groove 312. By adjusting the relative position between the first adjusting part 31 and the second adjusting part 32, after finding the appropriate height, rotate the rotatable adjusting part to screw the convex part 34 into the corresponding groove part 33. The connection between the mutually cooperating groove part 33 and the convex part 34 improves the accuracy of height adjustment, ensures the reliability of the prosthesis during use, and also improves the convenience of operation.

[0055] As ​ and ​ shown, a first positioning part 12 is provided on the proximal end part 10 of the femoral stem, and a first positioning groove 43 is provided on the filling component 40. The first positioning part 12 is inserted into the first positioning groove 43; and / or, as ​ and ​ shown, a second positioning part 51 is provided on the extension stem 50, and a second positioning groove 45 is provided on the filling component 40. The second positioning part 51 is inserted into the second positioning groove 45 to connect the proximal end part 10 of the femoral stem, the filling component 40 and the extension stem 50, reduce the damage to the proximal end part 10 of the femoral stem, and improve the strength of the proximal end part 10 of the femoral stem.

[0056] As ​ shown, the filling component 40 includes a filling side 41 and a shoulder shaving side 42. When the filling component 40 is installed, it is located at the hip joint bone defect site. The filling side 41 is applicable to the side with bone defects and plays a role in filling the bone defects. The shoulder shaving side 42 is located on the side with good bone quality and plays a role in retaining the bone mass as much as possible.

[0057] As ​ and ​ shown, the extension stem 50 includes an anti-rotation ridge 53 and a cross tuning fork 521. The anti-rotation ridge 53 is located between the second positioning part 51 and the cross tuning fork 521. By axially arranging spaced ridge-like protrusions, it is ensured that after the extension stem is inserted into the femoral medullary cavity, there will be no axial rotation and it plays a fixing role. The cross tuning fork 521 is provided at the end of the extension stem 50 and is made of an elastic material. It can undergo slight deformation according to the actual medullary cavity and plays a role in reducing the pain of the patient.

[0058] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0059] By providing a filling part and a height adjustment device between the proximal end of the femoral stem and the extension stem, the prosthesis can fill the bone defect site at a very low cost. At the same time, by using the height adjustment device, height-adjustable filling can be achieved according to different defect sites.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hip joint prosthesis, characterized in that, Comprising: The proximal end portion (10) of the femoral stem; The extension stem (50); A filling member (40) disposed between the proximal end portion (10) of the femoral stem and the extension stem (50) to connect the proximal end portion (10) of the femoral stem and the extension stem (50); A height adjustment assembly (30), at least a part of the height adjustment assembly (30) being disposed between the proximal end portion (10) of the femoral stem and the filling member (40) and being telescopically disposed to adjust the height of the hip joint prosthesis by adjusting the distance between the proximal end portion (10) of the femoral stem and the extension stem (50); The height adjustment assembly (30) includes: a first adjustment member (31) and a second adjustment member (32), the first adjustment member (31) being disposed on the proximal end portion (10) of the femoral stem, the second adjustment member (32) being disposed on the filling member (40), and the first adjustment member (31) being disposed such that its position is adjustable relative to the second adjustment member (32) so that at least a part of the height adjustment assembly (30) is telescopically disposed; The first adjustment member (31) and the second adjustment member (32) are connected by a mutually cooperating groove portion (33) and a protrusion portion (34); The first adjustment member (31) is rotatably connected to the proximal end portion (10) of the femoral stem, or the second adjustment member (32) is rotatably connected to the filling member (40), so that when the first adjustment member (31) and the second adjustment member (32) rotate relative to each other, the protrusion portion (34) is inserted into or disengaged from the groove portion (33); Both the protrusion portion (34) and the groove portion (33) are multiple, and the multiple protrusion portions (34) and the multiple groove portions (33) are both arranged along the telescopic direction of the height adjustment assembly (30).

2. The hip joint prosthesis according to claim 1, characterized in that, The first adjustment member (31) is integrally formed with the proximal end portion (10) of the femoral stem, or the first adjustment member (31) is detachably mounted on the proximal end portion (10) of the femoral stem.

3. The hip joint prosthesis according to claim 1, characterized in that, The second adjustment member (32) is integrally formed with the filling member (40), or the second adjustment member (32) is detachably mounted on the filling member (40).

4. The hip joint prosthesis according to claim 1, characterized in that A first mounting groove (11) is provided on the proximal end portion (10) of the femoral stem, and at least a part of the first adjustment member (31) is detachably mounted in the first mounting groove (11); a second mounting groove (46) is provided on the filling member (40), and at least a part of the second adjustment member (32) is detachably mounted in the second mounting groove (46).

5. The hip joint prosthesis according to claim 4, characterized in that, The first adjusting member (31) includes a first mounting portion (311) and a first connecting portion (313). The first mounting portion (311) is adapted to the first mounting groove (11) for fixed installation in the first mounting groove (11). The second adjusting member (32) includes a second mounting portion (321) and a second connecting portion (322). The second mounting portion (321) is adapted to the second mounting groove (46) for rotatably installing in the second mounting groove (46). Wherein, the first connecting portion (313) and the second connecting portion (322) are connected by a mutually matching groove portion (33) and a protrusion portion (34).

6. The hip joint prosthesis according to claim 5, characterized in that, The groove portion (33) is provided on the first connecting portion (313), and the protrusion portion (34) is provided on the second connecting portion (322).

7. The hip joint prosthesis according to claim 5, characterized in that, Both the first connecting portion (313) and the second connecting portion (322) are multiple. The multiple first connecting portions (313) and the multiple second connecting portions (322) are arranged in one-to-one correspondence, and the multiple first connecting portions (313) and the multiple second connecting portions (322) are all arranged at intervals along the rotation direction of the second mounting portion (321).

8. The hip joint prosthesis according to claim 1 or 5, characterized in that, A retaining portion (314) is provided on the groove portion (33). After the protrusion portion (34) extends into the groove portion (33), the retaining portion (314) stops on one side of the protrusion portion (34) to prevent the protrusion portion (34) from rotating back.

9. The hip joint prosthesis according to claim 8, characterized in that, The retaining portion (314) includes a transition surface, a retaining surface and a connecting surface connected in sequence. The connecting surface is connected to the groove surface of the groove portion (33). The transition surface is an arc surface or an inclined surface inclined to the retaining surface. The retaining surface is arranged towards the direction in which the protrusion portion (34) extends into the groove portion (33), so as to stop the protrusion portion (34) through the retaining surface when the protrusion portion (34) moves from one side of the retaining portion (314) to the other side of the retaining portion (314).

10. The hip joint prosthesis according to claim 1, characterized in that, A first positioning portion (12) is provided on the proximal end portion (10) of the femoral stem, and a first positioning groove (43) is provided on the filling member (40). The first positioning portion (12) is inserted into the first positioning groove (43); and / or, a second positioning portion (51) is provided on the extension stem (50), and a second positioning groove (45) is provided on the filling member (40). The second positioning portion (51) is inserted into the second positioning groove (45).

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