A hip joint assembly, a hip joint prosthesis and a method of assembly

Abstract

The application discloses a kind of acetabular assembly, hip joint prosthesis and assembly method, a kind of acetabular assembly, comprising: acetabular outer cup and acetabular liner;Acetabular outer cup includes first cup body, first cup body is formed around first containing space, first cup body is provided with anti-rotation groove, anti-rotation groove extends from the cup mouth end surface of the first cup body to the inner wall of the first cup body;Acetabular liner includes second cup body, second cup body can be contained in first containing space, the outer wall of second cup body is provided with anti-rotation part, and anti-rotation part can be matched in anti-rotation groove;Acetabular assembly can be in the relatively stable pre-placed state between acetabular outer cup and acetabular liner, in pre-placed state, in the direction of the axis of first cup body inward, part of anti-rotation part enters anti-rotation groove.In the application, the probability that anti-rotation part is abraded or the degree that anti-rotation part is abraded can be reduced in the process of acetabular assembly assembly.

Description

Technical Field

[0001] This application belongs to the field of medical devices, and in particular relates to an acetabular assembly, a hip joint prosthesis, and an assembly method. Background Technology

[0002] The hip joint is the joint that connects the thigh bone (femur) to the hip bone of the pelvis, and it plays a vital role in human walking. In some patients, when the hip joint is damaged due to disease or trauma, the lesion can be surgically removed, and a corresponding hip joint prosthesis can be used to replace the removed hip joint.

[0003] In related technologies, hip joint prostheses include an acetabular assembly, which comprises an acetabular cup and a liner. The acetabular cup is used for connection and fixation to the patient's hip bone, and the liner is connected to the acetabular cup. The liner typically moves axially along the acetabular cup to be fully inserted into it. A groove is provided on one end face of the acetabular cup along its axial direction, and a boss is provided on the liner that can move axially along the acetabular cup to fit into this groove. When the liner is fully inserted into the acetabular cup, the engagement of the boss and the groove restricts the rotation of the liner relative to the acetabular cup about its axis.

[0004] However, in actual surgery, because the assembly of the acetabular cup and liner is performed inside the body, the surgeon's field of vision is easily limited by human tissue. This can lead to misalignment of the liner's boss and the acetabular cup's groove in the circumferential direction during guidance and positioning. If the liner is forcibly inserted into the acetabular cup along its axial direction, interference and wear between the boss and the cup can easily occur, affecting the stability of the liner and acetabular cup after installation. Summary of the Invention

[0005] This application provides an acetabular assembly, a hip joint prosthesis, and an assembly method, which can reduce or even avoid wear caused by misalignment of the anti-rotation part during the assembly of the acetabular assembly.

[0006] In a first aspect, embodiments of this application provide an acetabular assembly, including: an outer acetabular cup and an inner acetabular liner;

[0007] The acetabular external cup includes a first cup body, which surrounds and forms a first receiving space. The first cup body is provided with an anti-rotation groove and a backlash groove. The anti-rotation groove extends from the cup mouth end face of the first cup body to the inner wall of the first cup body, and the backlash groove communicates with the first receiving space.

[0008] The acetabular liner includes a second cup body, which can be accommodated within the first accommodating space. The outer wall of the second cup body is provided with an anti-rotation part and a locking part. The anti-rotation part can be matched within the anti-rotation groove, and the locking part can be matched within the anti-reverse groove.

[0009] The acetabular assembly can be in a relatively stable pre-positioned state between the outer acetabular cup and the inner acetabular liner. In the pre-positioned state, the locking part abuts against the inner wall of the first cup body; a portion of the anti-rotation part extends into the anti-rotation groove.

[0010] Optionally, the radial cross-sectional area of ​​the anti-spin groove at the end away from the bottom of the first cup body is greater than or equal to the radial cross-sectional area of ​​the anti-spin part at the end near the bottom of the second cup body.

[0011] Optionally, the anti-spin portion includes a second outer wall located circumferentially in the second cup body; wherein,

[0012] Along the outward direction of the axis of the second cup body, the second outer wall is inclined in a direction away from the axis of the anti-rotation part; or

[0013] The second outer wall is parallel to the axis of the anti-rotation part.

[0014] Optionally, the number of anti-spin grooves is an integer multiple of the number of anti-spin parts, and several anti-spin grooves are evenly arranged on the cup mouth end face of the first cup body along the circumference of the first cup body.

[0015] Optionally, the outer contour of the radial section of the anti-spinning part is one or more combinations of a circular arc, an elliptical arc, a parabola, an irregular curve, and an involute.

[0016] Optionally, the second cup body is made of a deformable material, and when the acetabular assembly is in the pre-positioned state, the acetabular liner is in a non-deformable state.

[0017] Optionally, the anti-spin groove is connected to the first receiving space, and in the pre-placed state, the locking part abuts against the inner wall of the anti-spin groove.

[0018] Optionally, in the pre-placed state, the length of the portion of the anti-spinning part extending into the anti-spinning groove along the axial direction of the first cup body is 0.1 mm to 2.5 mm.

[0019] Optionally, the inner wall of the first accommodating space includes a first conical surface connected to the cup mouth end face of the first cup body, and the inner diameter of the first conical surface gradually increases along the bottom of the first cup body toward the groove; the outer wall of the second cup body includes a second conical surface, and the first conical surface and the second conical surface are dimensionally matched.

[0020] Optionally, the first conical surface and the second conical surface may have a transition fit or an interference fit.

[0021] Optionally, the locking part is located on the outer wall of the second cup body at the end away from the bottom of the second cup body; or

[0022] The locking part is located at one end of the second conical surface near the bottom of the second cup body.

[0023] Optionally, the locking part is an annular boss arranged along the circumference of the second cup body.

[0024] Optionally, the inner wall of the first cup body is further provided with:

[0025] A first mounting hole, communicating with and coaxially disposed with the first receiving space, is used for detachable connection with a surgical instrument; and / or

[0026] The second mounting hole is connected to the first accommodating space but not aligned with it. The second mounting hole is a through hole and is used to install bone screws.

[0027] Optionally, the second cup body forms a second receiving space, and the cup mouth end face of the second cup body is provided with an anti-dislodgement part. The anti-dislodgement part is connected to the inner wall of the second cup body to form a smooth spherical surface, which is used to contact the femoral head prosthesis.

[0028] Secondly, embodiments of this application also provide an acetabular assembly, including: an outer acetabular cup and an inner acetabular liner;

[0029] The acetabular external cup includes a first cup body, which forms a first receiving space. The first cup body is provided with an anti-rotation groove, which extends from the cup mouth end face of the first cup body to the inner wall of the first cup body.

[0030] The acetabular liner includes a second cup body, which can be accommodated within the first accommodating space. The outer wall of the second cup body is provided with an anti-rotation part, which can be matched within the anti-rotation groove.

[0031] The acetabular assembly can be in a relatively stable pre-positioned state between the outer acetabular cup and the inner acetabular liner, in which a portion of the anti-rotation part extends into the anti-rotation groove.

[0032] Thirdly, embodiments of this application also provide a hip joint prosthesis, comprising:

[0033] The acetabular assembly as described in any one of the first or second aspects; and

[0034] A femoral head prosthesis for fitting and mounting to the acetabular liner.

[0035] Fourthly, embodiments of this application also provide a method for assembling the acetabular assembly based on any one of the first or second aspects, comprising:

[0036] A portion of the second cup is placed in the first receiving space so that the acetabular assembly is in a relatively stable pre-positioned state between the outer acetabular cup and the inner acetabular liner, wherein a portion of the anti-rotation part extends into the anti-rotation groove in the pre-positioned state.

[0037] In this embodiment, the acetabular assembly, in its pre-placed state, can abut against the inner wall of the first receiving space via the locking part, ensuring a relatively stable state for the acetabular outer cup and acetabular liner. At this time, the anti-rotation part is located within the anti-rotation groove, enabling pre-positioning of the acetabular outer cup and acetabular liner in the circumferential direction of the acetabular outer cup. This allows surgical personnel to conveniently and accurately insert the acetabular liner into the first receiving space along the axial direction of the acetabular outer cup. In contrast, in related technologies, the acetabular liner and acetabular outer cup in the acetabular assembly are prone to misalignment in the circumferential direction of the acetabular outer cup, leading to wear of the anti-rotation part during insertion into the anti-rotation groove. Therefore, the acetabular assembly provided in this embodiment can reduce or even avoid wear caused by misalignment of the anti-rotation part during acetabular assembly installation, thereby improving the stability of the acetabular assembly after assembly. Attached Figure Description

[0038] The technical solution and its beneficial effects will become apparent from the following detailed description of specific embodiments of this application, in conjunction with the accompanying drawings.

[0039] Figure 1 This is a schematic diagram of the structure of the hip joint prosthesis provided in the embodiments of this application.

[0040] Figure 2 for Figure 1 The diagram shows the assembly of the acetabular component of the hip joint prosthesis.

[0041] Figure 3 for Figure 2 The exploded view of the acetabular assembly is shown.

[0042] Figure 4 for Figure 2 The diagram shows the structure of the acetabular assembly in its pre-positioned state.

[0043] Figure 5 for Figure 4 The acetabular assembly shown is a cross-sectional view along the AA direction.

[0044] Figure 6 for Figure 5 A magnified view of section X of the acetabular assembly cross-section shown.

[0045] Figure 7 for Figure 2 The diagram shows the structural structure of the acetabular liner of the acetabular assembly.

[0046] Figure 8 for Figure 7 The acetabular liner shown is a cross-sectional view along the BB direction.

[0047] Figure 9 for Figure 2 The diagram shows the structure of the acetabular outer cup of the acetabular assembly.

[0048] Figure 10 A flowchart illustrating a method for assembling an acetabular assembly, as provided in an embodiment of this application. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0050] This application provides an acetabular assembly for use in a hip joint prosthesis. The hip joint prosthesis is used to replace the hip joint in a user's body. For example, in some patients, when the hip joint is damaged due to disease or trauma, the lesion can be surgically removed, and a corresponding hip joint prosthesis can be used to replace the removed hip joint.

[0051] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the hip joint prosthesis provided in an embodiment of this application. The hip joint prosthesis may include an acetabular assembly 100 and a femoral head prosthesis 200. The acetabular assembly 100 is fixed to the patient's pelvis to replace the removed acetabulum. The femoral head prosthesis 200 is fixed to the patient's femur to replace the removed femoral head. By rotating the femoral head prosthesis 200 onto the acetabular assembly 100, the hip joint prosthesis can replace the removed hip joint, allowing the patient to perform daily activities using the hip joint prosthesis in conjunction with their own muscle tissue.

[0052] like Figure 1 As shown, the femoral head prosthesis 200 may include a ball head 21, the shape of which may resemble the shape of the femoral head. The ball head 21 may be directly connected to the femur via fasteners such as screws.

[0053] Optionally, the femoral head prosthesis 200 may also include a femoral stem 22. One end of the femoral stem 22 is connected and fixed to the ball head 21, and the other end of the femoral stem 22 is connected and fixed to the patient's femur.

[0054] like Figure 1As shown, the femoral stem 22 can be a bent structure, including a first segment 221 and a second segment 222 inclined to the first segment 221. The second segment 222 can be connected and fixed to the surface of the patient's femur, or it can have a pre-set hole in the femur. The second segment 222 is embedded entirely into the pre-set hole inside the femur and is connected and fixed to the femur by fasteners such as screws. In this case, the second segment 222 can increase the connection and mating area between the femoral head prosthesis 200 and the patient's femur, thereby making the connection between the femoral head prosthesis 200 and the patient's femur more stable.

[0055] The first segment 221 and the ball head 21 can be integrally formed, thereby increasing the overall strength of the femoral stem 22 and the ball head 21. Alternatively, the femoral stem 22 and the ball head 21 can be manufactured separately and then connected and fixed. For example, the free end of the first segment 221 is provided with external threads, while the ball head 21 is provided with a first threaded hole 211, so that the free end of the first segment 221 can be screwed and fixed into the first threaded hole 211 of the ball head 21 by thread engagement.

[0056] Please refer to Figure 2 and Figure 3 , Figure 2 for Figure 1 The diagram shows the acetabular assembly of the hip joint prosthesis. Figure 3 for Figure 2 The exploded view of the acetabular assembly is shown.

[0057] like Figure 2 and Figure 3 As shown, the acetabular assembly 100 may include an external acetabular cup 11 and an acetabular liner 12. The external acetabular cup 11 is used for installation and fixation to the patient's pelvis. The external acetabular cup 11 forms a first receiving space 111 with an opening facing away from the patient's pelvis, and the acetabular liner 12 is at least partially fixed within the first receiving space 111. The acetabular liner 12 forms a second receiving space 121, allowing the ball head 21 to be rotatably mounted within the second receiving space 121. Furthermore, the acetabular assembly 100, fixed to the patient's pelvis, forms a rotatable connection with the femoral head prosthesis 200, fixed to the patient's femur, to replace the patient's resected hip joint.

[0058] For example, such as Figure 3As shown, the acetabular outer cup 11 includes a first cup body 112. The first cup body 112 surrounds and forms a first receiving space 111. The first cup body 112 is provided with an anti-rotation groove 113 and an anti-retraction groove 114. The anti-rotation groove 113 extends from the cup opening end face of the first cup body 112 to the inner wall of the first cup body 112. The anti-retraction groove 114 communicates with the first receiving space 111. The acetabular inner liner 12 includes a second cup body 122. The second cup body 122 can be received within the first receiving space 111. The outer wall of the second cup body 122 is provided with an anti-rotation portion 123 and a locking portion 124. The anti-rotation portion 123 can be matched, for example, locked within the anti-rotation groove 113. Furthermore, when the second cup body 122 is fully inserted into the first receiving space 111, the anti-rotation portion 123 abuts against the inner wall of the anti-rotation groove 113, which can restrict the second cup body 122 from rotating relative to the first cup body 112 along the axial direction of the first cup body 112. The locking part 124 can be matched, for example, locked in the anti-reverse groove 114. Furthermore, when the second cup 122 is fully inserted into the first receiving space 111, the locking part 124 cooperates with the inner wall of the anti-reverse groove 114 to restrict the second cup 122 from moving linearly relative to the first cup 112 along the axis of the first cup 112.

[0059] Therefore, when the acetabular liner 12 is fully inserted into the first receiving space 111, the connection and fixation between the acetabular liner 12 and the acetabular outer cup 11 can be achieved through the cooperation of the anti-rotation part 123 and the anti-rotation groove 113, and the cooperation of the locking part 124 and the anti-retraction groove 114.

[0060] During the assembly of the acetabular assembly 100, when the first cup 112 of the acetabular liner 12 is only partially located within the first receiving space 111, the acetabular assembly 100 can be in a relatively stable pre-positioned state between the outer acetabular cup 11 and the acetabular liner 12. At this time, applying a force to the acetabular liner 12 in the inward direction along the axis of the first cup 112 can cause the acetabular liner 12 to move inward along the axis of the first cup 112 after being subjected to force, until the anti-rotation part 123 is completely inserted into the anti-rotation groove 113 and the second cup 122 is completely inserted into the first receiving space 111.

[0061] Please refer to Figures 4 to 6 , Figure 4 for Figure 2 The diagram shown is a structural schematic of the acetabular assembly in its pre-positioned state. Figure 5 for Figure 4 The acetabular assembly shown is a cross-sectional view along the AA direction. Figure 6 for Figure 5 A magnified view of section X of the acetabular assembly cross-section shown.

[0062] like Figure 6As shown, in some embodiments, in order to reduce the probability of the anti-rotation part 123 being worn or even damaged during the installation of the acetabular liner 12 and the acetabular outer cup 11, a portion of the anti-rotation part 123 extends into the anti-rotation groove 113 in the pre-placed state.

[0063] Understandably, since the assembly of the acetabular outer cup 11 and the acetabular liner 12 is usually performed inside the patient's body, the field of vision of the medical staff performing hip joint surgery is easily limited during the assembly of the acetabular outer cup 11 and the acetabular liner 12. Furthermore, the circumferential positioning of the anti-rotation part 123 and the anti-rotation groove 113 within the acetabular outer cup 11 relies on the medical staff. Therefore, in the pre-placed state, if the anti-rotation part 123 is completely outside the anti-rotation groove 113, it can easily lead to circumferential angular misalignment between the anti-rotation part 123 and the anti-rotation groove 113. If the acetabular liner 12 is forcibly inserted into the acetabular outer cup 11 at this time, it can easily cause interference between the anti-rotation part 123 and the groove end face of the anti-rotation groove 113, leading to wear or even compression damage to the anti-rotation part 123, ultimately affecting the stability of the acetabular liner 12 and the acetabular outer cup 11 after installation.

[0064] In contrast, in the pre-positioned state, if part of the anti-rotation portion 123 is located within the anti-rotation groove 113, the acetabular outer cup 11 and the acetabular inner liner 12 can be pre-positioned in the circumferential direction of the acetabular outer cup 11. This allows medical personnel performing surgery to conveniently and accurately insert the acetabular inner liner 12 into the first receiving space 111 along the axial direction of the acetabular outer cup 11. On the other hand, during the process of switching the acetabular assembly 100 from the pre-positioned state to the complete insertion of the second cup body 122 into the first receiving space 111, the acetabular assembly 100 provided in this application embodiment can prevent the anti-rotation portion 123 from being worn or even damaged by the groove end face of the anti-rotation groove 113.

[0065] In this embodiment, the relatively stable state of the acetabular outer cup 11 and the acetabular inner liner 12 can be achieved by the locking part 124 abutting against the inner wall of the first cup body 112, or by other guiding structures. This embodiment does not limit this.

[0066] Taking the case where the locking part 124 abuts against the inner wall of the first cup body 112, resulting in a relatively stable state for the acetabular outer cup 11 and the acetabular inner liner 12: the pre-placement state is the state in which the locking part 124 just contacts the inner wall of the first cup body 112 during the process of the second cup body 122 being inserted into the first receiving space 111 along the axial direction of the first cup body 112. That is, the pre-placement state is not an intermediate state between the moment the locking part 124 just contacts the inner wall of the first cup body 112 and the moment the locking part 124 is engaged in the anti-retraction groove 114.

[0067] In some embodiments, the groove opening of the anti-spin groove 113 is formed on the cup opening end face of the first cup body 111, so that the anti-spin part 123 can be placed into the anti-spin groove 113 during the process of the second cup body 122 being placed into the first receiving space 111 along the axial direction of the first cup body 112.

[0068] On the other hand, the anti-spin groove 113 can also be connected to the first receiving space 111, that is, a portion of the opening of the anti-spin groove 113 is formed on the inner wall of the first cup body 112. In this case, the inner wall of the anti-spin groove 113 can also be understood as a part of the inner wall of the first cup body 112. Therefore, the aforementioned contact between the locking part 124 and the inner wall of the first cup body 112 in the pre-placed state can also be understood as the contact between the locking part 124 and the inner wall of the anti-spin groove 113. For example, in the pre-placed state, the locking part 124 can abut against the side of the inner wall of the anti-spin groove 113 facing the cup opening end face of the first cup body 112.

[0069] The anti-rotation groove 113 may have a chamfer at the end edge of the groove opening. The space formed by the chamfered surface can also be understood as the internal space of the anti-rotation groove 113.

[0070] In the pre-placed state, the distance by which the anti-spin portion 123 extends into the anti-spin groove 113 along the axial direction of the first cup body 112 can be from 0.1 mm to 2.5 mm.

[0071] Understandably, in the pre-positioned state, a force can be applied to the acetabular liner 12 inward along the axis of the first cup body 112 so that the acetabular liner 12 is fully inserted into the first receiving space 111 after being subjected to force. However, in the actual assembly process, it is objectively difficult for medical personnel to make the direction of the force applied coincide with the axis of the first cup body 112.

[0072] Therefore, along the axial direction of the first cup body 112, when the distance of the anti-rotation part 123 extending into the anti-rotation groove 113 is less than 0.1 mm, the overlap between the anti-rotation part 123 and the anti-rotation groove 113 is too small, meaning that the inner wall of the anti-rotation groove 113 has a small portion that can provide anti-rotation and limiting function for the anti-rotation part 123. In this case, if the force applied by the medical personnel has a certain angular deviation, it may cause the anti-rotation part 123 to detach from the anti-rotation groove 113 and collide and rub against the inner wall of the anti-rotation groove 113. Furthermore, even after the anti-rotation part 123 has partially moved outside the anti-rotation groove 113, continued application of force by the medical personnel to the acetabular liner 12 may cause friction and collision between the anti-rotation part 123 and the groove end face of the anti-rotation groove 113.

[0073] It is also understandable that, in the pre-placed state, if the distance from which the anti-rotation part 123 extends into the anti-rotation groove 113 along the axial direction of the first cup body 112 is greater than 2.5 mm, it means that medical personnel will have to manually place the anti-rotation part 123 into the anti-rotation groove 113 to a relatively deep position. At this time, as the depth to which the anti-rotation part 123 needs to be placed into the anti-rotation groove 113 increases, the possibility of friction and interference between the anti-rotation part 123 and the inner wall of the anti-rotation groove 113 during the placement process will increase.

[0074] On the other hand, in the pre-positioned state, the locking part 124 abuts against the inner wall of the first cup 112, causing the outer acetabular cup 11 to provide a first supporting force to the acetabular liner 12. The medical personnel holding the acetabular liner 12 will feel this first supporting force to determine that the acetabular assembly 100 is in the pre-positioned state. If, in the pre-positioned state, the anti-rotation part 123 needs to be inserted deep into the anti-rotation groove 113, the probability of the locking part 124 not yet contacting the inner wall of the first cup 112, while the anti-rotation part 123 is in contact with the inner wall of the anti-rotation groove 113, increases. In this case, if the anti-rotation part 123 contacts the inner wall of the anti-rotation groove 113, causing the outer acetabular cup 11 to provide a second supporting force to the acetabular liner 12, the medical personnel holding the acetabular liner 12 may easily mistake the second supporting force for the first supporting force and believe that the acetabular assembly 100 is already in the pre-positioned state. If the acetabular liner 12 is forcibly inserted into the acetabular outer cup 11, it will cause severe wear on the inner wall of the anti-rotation part 123 and / or the anti-rotation groove 113, and may even cause them to be squeezed and deformed, affecting the subsequent installation of the acetabular assembly 100.

[0075] In some embodiments, the acetabular outer cup 11 can be made of a rigid material such as titanium alloy, while the acetabular inner liner 12 can be made of a deformable material such as polyethylene or other elastic material. The aforementioned pre-placement state can be understood as the state in which the locking part 124 just abuts against the inner wall of the first cup body 112 during the process of inserting the acetabular inner liner 12 into the first receiving space 111 along the axis of the first cup body 112. Therefore, in the pre-placement state, the acetabular inner liner 12 is in a non-deformable state. At this time, as the acetabular inner liner 12 continues to be inserted into the first receiving space 111 along the axis of the first cup body 112, the acetabular inner liner 12 can undergo elastic deformation first. Until the acetabular inner liner 12 and the acetabular outer cup 11 are assembled, the locking part of the acetabular inner liner 12 can elastically recover to its undeformed state and be locked in the anti-reverse groove 114.

[0076] For example, the first receiving space 111 can be a hemispherical groove, a frustum-shaped groove, or a groove with a frustum-shaped end near the opening and a hemispherical end away from the opening. Therefore, the inner diameter of the first receiving space 111 gradually decreases inward along the axis of the first cup body 112, that is, the portion of the inner wall of the first cup body 112 connected to the cup opening end face of the first cup body 112 is inclined relative to the axis of the first cup body 112.

[0077] like Figure 6 As shown, along the axis of the first cup 112 inwards, when the second cup 122 of the acetabular liner 12 moves to the pre-positioned state of the acetabular assembly 100, the locking part 124 abuts against the portion where the inner wall of the first cup 112 connects to the cup opening end face of the first cup 112. At this time, the inner wall of the first cup 112 can apply a supporting force to the locking part 124, thereby making the position between the acetabular liner 12 and the acetabular outer cup 11 relatively stable when the acetabular assembly 100 is in the pre-positioned state.

[0078] In order to ensure that, in the pre-placed state, a portion of the anti-rotation part 123 extends into the anti-rotation groove 113 in the inward direction along the axis of the first cup body 112, and with the locking part 124 abutting against a specific position on the inner wall of the first cup body 112, the thickness of the anti-rotation part 123 in the inward direction along the axis of the second cup body 122 can be increased. Furthermore, in the pre-placed state, the anti-rotation part 123 can be changed from being completely outside the anti-rotation groove 113 to being partially inside the anti-rotation groove 113.

[0079] Correspondingly, the depth of the anti-rotation groove 113 in the axial direction of the first cup body 112 can be increased so that when the acetabular assembly 100 is assembled, the anti-rotation part 123 can be fully inserted into the anti-rotation groove 113.

[0080] Alternatively, given that the thickness of the anti-rotation portion 123 in the inward direction along the axis of the second cup 122 and the size of the first receiving space are determined, the thickness of the locking portion 124 in the radial direction of the acetabular liner 12 can be reduced. This allows for an increase in the depth to which the second cup 122 extends into the first receiving space 111 in the pre-positioned state. Correspondingly, the anti-rotation portion 123 also moves with the second cup 122. This allows the anti-rotation portion 123 to change from being completely outside the anti-rotation groove 113 to being partially inside the anti-rotation groove 113 in the pre-positioned state.

[0081] In the actual production process of the acetabular assembly 100, the solution of reducing the thickness of the locking part 124 in the radial direction of the acetabular liner 12 can be adopted alone, or the solution of increasing the thickness of the anti-rotation part 123 in the axial direction of the second cup body 122 can be adopted alone, or the thickness of the locking part 124 in the radial direction of the acetabular liner 12 and the thickness of the anti-rotation part 123 in the axial direction of the second cup body 122 can be increased simultaneously, or other parameters or shapes of the outer acetabular cup 11 and the acetabular liner 12 can be changed. It is understood that, in the pre-placed state, any technical solution in which a portion of the anti-rotation part 123 extends into the anti-rotation groove 113 in the direction inward along the axis of the first cup body 112 is within the protection scope of the embodiments of this application.

[0082] like Figure 6 As shown, in order to reduce the probability of the anti-rotation part 123 being worn during the installation of the acetabular inner liner 12 and the acetabular outer cup 11, the anti-rotation part 123 can be kept out of contact with the inner wall of the anti-rotation groove 113 in the pre-positioned state.

[0083] For example, the radial cross-section of the anti-rotation groove 113 at the end away from the bottom of the first cup 112 is larger than the radial cross-section of the anti-rotation part 123 at the end near the bottom of the second cup 122. Therefore, during the process of the acetabular liner 12 moving from being completely outside the first receiving space 111 to being in the pre-positioned state, the anti-rotation part 123 may not come into contact with the inner wall of the anti-rotation groove 113, thereby reducing the probability of the anti-rotation part 123 being worn by the inner wall of the anti-rotation groove 113.

[0084] Of course, it is also understandable that during actual surgery, the acetabular outer cup 11 and acetabular inner liner 12 are positioned into their pre-placed state by medical staff. Therefore, even if the radial cross-section of the anti-rotation groove 113 at the end away from the bottom of the first cup 112 is larger than the radial cross-section of the anti-rotation part 123 at the end near the bottom of the second cup 122, the anti-rotation part 123 may still come into contact with and wear against the inner wall of the anti-rotation groove 113 in the pre-placed state. However, objectively, because the radial cross-section of the anti-rotation groove 113 at the end away from the bottom of the first cup 112 is larger than the radial cross-section of the anti-rotation part 123 at the end near the bottom of the second cup 122, the probability of the anti-rotation part 123 being worn during the installation of the acetabular inner liner 12 and the acetabular outer cup 11 is reduced.

[0085] On the other hand, in order to ensure that the anti-rotation part 123 can abut against the side wall of the anti-rotation groove 113 to restrict relative rotation between the acetabular liner 12 and the acetabular outer cup 11 after the acetabular assembly 100 is assembled, the radial section of the end of the anti-rotation groove 113 away from the bottom of the first cup body 112 can be approximately the same as the radial section of the end of the anti-rotation part 123 away from the bottom of the second cup body 122. Therefore, after the acetabular assembly 100 is assembled, the end of the anti-rotation part 123 away from the bottom of the second cup body 122 and the inner wall of the end of the anti-rotation groove 113 away from the bottom of the first cup body 112 form a clearance fit, an interference fit, or a transition fit in terms of dimensions.

[0086] The radial section of the anti-spin groove 113 can be understood as a section perpendicular to the axis of the first cup body 112, and also a section parallel to the cup mouth end face of the first cup body 112. The radial section of the anti-spin part 123 can be understood as a section perpendicular to the axis of the second cup body 122.

[0087] In some implementations, such as Figure 3 As shown, the anti-spin portion 123 includes a second outer wall 1231 located circumferentially around the second cup body 122. In the direction outward along the axis of the second cup body 122, the second outer wall 1231 is inclined away from the axis of the anti-spin portion 123. Therefore, as... Figure 6 As shown, the width of the anti-spin part 123 at the end away from the bottom of the second cup body 122 in the radial direction of the second cup body 122 is greater than the width of the anti-spin part 123 at the end near the bottom of the second cup body 122 in the radial direction of the second cup body 122.

[0088] Of course, in some other embodiments, the radial cross-section of the anti-rotation portion 123 is the same along the axial direction of the first cup body 112, that is, the second outer wall 1231 is parallel to the axial direction of the anti-rotation portion 123.

[0089] Please refer to Figure 7 and Figure 8 , Figure 7 for Figure 2 The diagram shows the structural structure of the acetabular liner of the acetabular assembly. Figure 8 for Figure 7 The acetabular liner shown is a cross-sectional view along the BB direction.

[0090] like Figure 8 As shown, the outer contour line 1232 of the radial section of the anti-spinning part 123 can be one or more combinations of circular arc, elliptical arc, parabola, irregular curve and involute. For example, the anti-spinning part 123 can be a semi-frustum structure as a whole, and the connection between the semi-frustum and the circumferential outer wall of the second cup body 122 is rounded. In this case, the outer contour line 1232 of the radial section of the anti-spinning part 123 is composed of three circular arcs with different centers.

[0091] On the other hand, the anti-spin groove 113 can be a contoured groove similar in shape to the anti-spin portion 123. For example, the outer contour line 1232 of the radial section of the anti-spin portion 123 is a first parabola, and the inner wall contour line of the radial section of the anti-spin groove 113 is a second parabola similar to the first parabola. Alternatively, the outer contour line 1232 of the radial section of the anti-spin portion 123 is a first involute, and the inner wall contour line of the radial section of the anti-spin groove 113 is a second involute similar to the first parabola. This embodiment of the application does not limit this.

[0092] like Figure 3 As shown, the number of anti-spin grooves 113 is an integer multiple of the number of anti-spin parts 123, and several anti-spin grooves 113 are evenly arranged on the cup mouth end face of the first cup body 112 along the circumference of the first cup body 112.

[0093] Taking multiple anti-rotation grooves 113, including adjacent first, second, and third anti-rotation grooves, and anti-rotation portion 123, as an example, as an example, after the acetabular outer cup 11 is installed and fixed to the patient's pelvis, the first anti-rotation portion can be engaged in the first anti-rotation groove, or the second cup body 122 can be rotated around the axis of the first cup body 112 by a certain angle so that the first anti-rotation portion is engaged in the second or third anti-rotation groove. Furthermore, when there is a certain angular error in the installation of the femoral head prosthesis 200, the angle of the acetabular liner 12 can be adjusted by engaging a specific anti-rotation portion 123 into different anti-rotation grooves 113, thereby improving the accuracy of the fit between the acetabular liner 12 and the femoral head prosthesis 200. It can be seen that the acetabular assembly 100 provided in this application embodiment has the advantages of easy adjustment and high fault tolerance.

[0094] For example, such as Figure 3 and 4 As shown, the number of anti-spin grooves 113 can be twelve, while the number of anti-spin portions 123 can be twelve, six, four, or three. Alternatively, the number of anti-spin grooves 113 can be six, and the number of anti-spin portions 123 can be six, three, or one. It is understood that the embodiments of this application do not limit the number of anti-spin grooves 113 or the number of anti-spin portions 123.

[0095] like Figure 5 As shown, the inner wall of the first cup body 112 includes a first conical surface 115 connected to the cup opening end face of the first cup body. The inner diameter of the first conical surface 115 gradually increases from the bottom of the first cup body 112 towards the cup opening. Correspondingly, the outer wall of the second cup body 122 includes a second conical surface 125. The first conical surface 115 and the second conical surface 125 are dimensionally matched.

[0096] The first conical surface 115 and the second conical surface 125 can be dimensionally fitted together, either with an interference fit or a transition fit. Furthermore, once the second cup body 122 is fully inserted into the first receiving space 111, the fit between the first conical surface 115 and the second conical surface 125 can make the acetabular assembly 100 more secure.

[0097] like Figure 5 As shown, the inner wall of the first cup body 112 may also include a first spherical surface 116, the first spherical surface 116 being connected circumferentially to the end edge adjacent to the first conical surface 115, thereby forming a first receiving space 111 by the first spherical surface 116 and the first conical surface 115 surrounding the first spherical surface 116. Correspondingly, the outer wall of the first cup body 112 also includes a second spherical surface 126 that fits against the first spherical surface 116.

[0098] Alternatively, the inner wall of the first cup body 112 may also include a first plane to replace the first spherical surface 116 described above, and the first receiving space 111 is formed by the first plane and the first conical surface 115 disposed around the first plane. It is understood that the shape of the first receiving space 111 is not limited in the embodiments of this application.

[0099] Please refer to Figure 9 , Figure 9 for Figure 2 The diagram shows the structure of the acetabular outer cup of the acetabular assembly. The inner wall of the first cup body 112 may also be provided with a first mounting hole 117. The first mounting hole 117 communicates with and is coaxially arranged with the first receiving space 111. The first mounting hole 117 can be a through hole or a blind hole; this embodiment does not limit this. The first mounting hole 117 is used for detachable connection with surgical instruments.

[0100] The working principle of the first mounting hole 117 will be further explained below in conjunction with the surgical procedure:

[0101] The first mounting hole 117 can be a threaded hole. During the actual surgery, medical personnel first insert a threaded rod (used as a surgical instrument) into the patient's body and thread it into the first mounting hole 117. At this point, the medical personnel can use the threaded rod to press and fix the acetabular external cup 11 onto the patient's pelvis. Next, the medical personnel can lock the acetabular external cup 11 onto the patient's pelvis. Finally, the threaded rod is unscrewed from the first mounting hole 117 to complete the installation of the acetabular external cup 11.

[0102] Alternatively, the first mounting hole 117 may not be a threaded hole. Correspondingly, a rod capable of being sleeved, snapped, or magnetically attached to the first mounting hole 117 can be used instead of the aforementioned threaded rod as a surgical instrument, thereby enabling the first mounting hole 117 to be detachably connected to the surgical instrument. It is understood that this application does not limit the type of surgical instrument or the method by which the surgical instrument is detachably connected to the first mounting hole 117.

[0103] like Figure 9 As shown, the inner wall of the first cup body 112 may also be provided with a second mounting hole 118. The second mounting hole 118 communicates with the first receiving space 111 but is not coaxially arranged. The second mounting hole 118 is a through hole and is used to install the bone screw 300.

[0104] The working principle of the second mounting hole 118 will be further explained below in conjunction with the surgical procedure: First, the medical staff places the acetabular cup 11 on the patient's pelvis. Then, the medical staff can use bone screws 300 to screw and fix the acetabular cup 11 to the patient's pelvis.

[0105] The second mounting hole 118 can be a threaded hole, so that a part of the bone screw 300 is screwed to the patient's pelvic bone and the other part of the bone screw 300 is screwed to the inner wall of the second mounting hole 118.

[0106] Alternatively, the second mounting hole 118 can also be a countersunk hole. When the bone screw 300 is screwed into the patient's pelvis, the nut of the bone screw 300 is recessed into the second mounting hole 118, locking the acetabular external cup 11 onto the patient's pelvis. Of course, when the nut of the bone screw 300 is recessed into the second mounting hole 118, the side wall of the nut of the bone screw 300 can also be provided with external threads, which are screwed and fixed to the internal threads on the inner wall of the countersunk hole to further increase the stability of the connection between the acetabular external cup 11 and the pelvis.

[0107] It is understood that the shape of the second mounting hole 118 is not limited in the embodiments of this application. Any technical solution that can lock the acetabular cup 11 to the patient's pelvis by the bone screw 300 installed in the second mounting hole 118 is within the protection scope of the embodiments of this application.

[0108] The number of second mounting holes 118 can be one, two, or three. This application embodiment does not limit this. Any technical solution that can lock the acetabular cup 11 to the patient's pelvis by the bone screw 300 installed on the second mounting hole 118 is within the protection scope of this application embodiment.

[0109] The locking part 124 and the second cup body 122 can be assembled after separate manufacturing.

[0110] Replaceable, such as Figure 3As shown, the locking part 124 and the second cup body 122 can also be integrally molded. It is understood that the integral molding method can reduce the number of parts of the acetabular liner 12, thereby simplifying the steps in the assembly process of the acetabular assembly 100 and reducing the difficulty of hip joint surgery.

[0111] like Figure 3 As shown, the locking part 124 can be disposed on the outer wall of the second cup body 122 at the end away from the bottom of the second cup body 122. Alternatively, the locking part 124 can be disposed on the outer wall of the second cup body 122 at the end near the bottom of the second cup body 122. Of course, the locking part 124 can also be disposed at the middle of the outer wall of the second cup body 122 along the axial direction of the second cup body 122; this embodiment does not limit this to any particular location.

[0112] Taking the outer wall of the second cup body 122, including the second conical surface 125, as an example, Figure 3 As shown, the locking part 124 can be disposed at the end of the second conical surface 125 away from the bottom of the second cup body 122. The locking part 124 can also be disposed at the end of the second conical surface 125 near the bottom of the second cup body 122. Of course, the locking part 124 can also be disposed at the middle part of the second conical surface 125 along the axial direction of the second cup body 122, and this embodiment of the application does not limit this.

[0113] like Figure 3 As shown, the locking part 124 can be an annular boss arranged circumferentially along the second cup body 122, and correspondingly, the first receiving space 111 is an annular groove arranged circumferentially around the first conical surface 115.

[0114] Of course, the locking part 124 may include multiple arc-shaped protrusions, which may be uniformly or non-uniformly arranged along the circumference of the second cup body 122. This embodiment of the application does not limit this. For example, the locking part 124 may include multiple arc-shaped protrusions, which abut against the side of the inner wall of the anti-spin groove 113 facing the cup mouth end face of the first cup body 112 in the pre-placed state.

[0115] like Figure 3 As shown, the cup mouth end face of the second cup body 122 is provided with an anti-dislodgement part 127. The anti-dislodgement part 127 is connected to the inner wall of the second cup body 122 to form a smooth third spherical surface 129, which is used to contact the femoral head prosthesis 200. Taking the femoral head prosthesis 200 including the ball head 21 as an example, the ball head 21 is rotatably installed in the second receiving space 121. By providing the anti-dislodgement part 127, the contact area between the acetabular liner 12 and the ball head 21 can be increased, thereby reducing the probability of the ball head 21 dislodging from the second receiving space 121 during rotation, and thus improving the stability of the hip joint prosthesis after surgery.

[0116] The projection of the anti-slip part 127 onto the cup mouth end face of the second cup body 122 is an arc-shaped structure. This arc can be a semi-circular arc or a minor arc. Along the outward direction of the axis of the second cup body 122, the height of the anti-slip part 127 can gradually decrease from the middle of the arc towards both sides.

[0117] Optionally, the anti-detachment part 127 may not be provided on the cup mouth end face of the second cup body 122, and this embodiment does not limit this.

[0118] like Figure 3 As shown, the inner wall of the second cup body 122 and the cup opening end face of the second cup body 122 may also be partially provided with a first chamfer 128. Taking the femoral head prosthesis 200 including the femoral stem 22 as an example, during the rotation of the femoral stem 22 following the ball head 21, the first chamfer 128 can serve as a clearance space for the rotation of the femoral stem 22, thereby increasing the rotation angle of the femoral head prosthesis 200.

[0119] Optionally, the inner wall of the second cup body 122 and the cup opening end face of the second cup body 122 may not have the aforementioned first chamfer 128. Alternatively, the second cup body 122 may simultaneously have the aforementioned first chamfer 128 and anti-dislodgement part 127. For example, the first chamfer 128 and the anti-dislodgement part 127 are disposed opposite to each other on both sides of the axis of the acetabular liner 12.

[0120] For example, the femoral stem 22 can be along the first direction ( Figure 1 The femoral stem 22 rotates counterclockwise until it abuts against the first chamfer 128. In contrast, if the first chamfer 128 is not chamfered, the angle at which the femoral stem 22 can rotate in the first direction will be reduced.

[0121] Please refer to Figure 10 , Figure 10 A flowchart illustrating a method for assembling an acetabular assembly, as provided in an embodiment of this application.

[0122] Prior to actual hip surgery, the acetabular assembly 100 may be assembled outside the patient's body, such as during assembly testing by the manufacturer or pre-assembly for ease of transport and handling. Therefore, for the case where the acetabular assembly 100 is assembled outside the patient's body, this application embodiment also provides an assembly method based on the aforementioned acetabular assembly, including:

[0123] 101. Obtain an acetabular outer cup 11 and an acetabular inner liner 12.

[0124] The acetabular external cup 11 is the acetabular external cup 11 described above, and the acetabular inner liner 12 is the acetabular inner liner 12 described above.

[0125] 102. A portion of the first cup body 112 is placed in the first receiving space 111 so that the acetabular assembly 100 is in a relatively stable pre-positioned state between the outer acetabular cup 11 and the inner acetabular liner 12.

[0126] In the pre-positioned state, a portion of the anti-spinning part 123 extends into the anti-spinning groove 113.

[0127] 103. Along the axis of the first cup 112, insert the first cup 112 completely into the first receiving space 111.

[0128] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0129] The acetabular assembly 100 and hip joint prosthesis provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A hip acetabular assembly, characterized in that, include: acetabular outer cup and acetabular inner liner; The acetabular external cup includes a first cup body, which surrounds and forms a first receiving space. The first cup body is provided with an anti-rotation groove and a backlash groove. The anti-rotation groove extends from the cup mouth end face of the first cup body to the inner wall of the first cup body. The backlash groove communicates with the first receiving space. The anti-rotation groove and the backlash groove are spaced apart along the direction from the cup mouth of the first cup body toward the cup bottom. The acetabular liner includes a second cup body, which can be accommodated in the first accommodating space. The outer wall of the second cup body is provided with an anti-rotation part and a locking part. The anti-rotation part can be matched in the anti-rotation groove. The anti-rotation part and the locking part are spaced apart along the direction from the cup opening to the cup bottom of the second cup body. The locking part can be matched in the anti-reverse groove. The acetabular assembly can be in a relatively stable pre-positioned state between the outer acetabular cup and the inner acetabular liner. In the pre-positioned state, the locking part abuts against the inner wall of the first cup body, and a portion of the anti-rotation part extends into the anti-rotation groove. Along the axial direction of the first cup body, the length of the portion of the anti-rotation part extending into the anti-rotation groove is 0.1 mm to 2.5 mm. Wherein, the radial cross-sectional area of ​​the anti-spin groove at the end away from the bottom of the first cup body is greater than or equal to the radial cross-sectional area of ​​the anti-spin part at the end near the bottom of the second cup body.

2. The acetabular assembly according to claim 1, characterized in that, The anti-spin portion includes a second outer wall located circumferentially around the second cup body; wherein... Along the outward direction of the axis of the second cup body, the second outer wall is inclined in a direction away from the axis of the anti-rotation part; or The second outer wall is parallel to the axis of the anti-rotation part.

3. The acetabular assembly according to claim 1, characterized in that, The number of anti-spin grooves is an integer multiple of the number of anti-spin parts, and several anti-spin grooves are evenly arranged on the cup mouth end face of the first cup body along the circumference of the first cup body.

4. The acetabular assembly according to claim 1, characterized in that, The outer contour of the radial section of the anti-spinning part is one or more combinations of circular arc, elliptical arc, parabola, irregular curve and involute.

5. The acetabular assembly according to claim 1, characterized in that, The second cup body is made of a deformable material. When the acetabular assembly is in the pre-positioned state, the acetabular liner is in a non-deformable state.

6. The acetabular assembly according to claim 1, characterized in that, The anti-spin groove is connected to the first accommodating space, and in the pre-placed state, the locking part abuts against the inner wall of the anti-spin groove.

7. The acetabular assembly according to any one of claims 1 to 6, characterized in that, The inner wall of the first cup body includes a first conical surface connected to the cup mouth end face of the first cup body, and the inner diameter of the first conical surface gradually increases along the bottom of the first cup body towards the cup mouth; the outer wall of the second cup body includes a second conical surface, and the first conical surface and the second conical surface are dimensionally matched.

8. The acetabular assembly according to claim 7, characterized in that, The first conical surface and the second conical surface are either transition fit or interference fit.

9. The acetabular assembly according to claim 7, characterized in that, The locking part is located on the outer wall of the second cup body at an end away from the bottom of the second cup body; or The locking part is located at one end of the second conical surface near the bottom of the second cup body.

10. The acetabular assembly according to any one of claims 1 to 6, characterized in that, The locking part is an annular protrusion arranged along the circumference of the second cup body.

11. The acetabular assembly according to any one of claims 1 to 6, characterized in that, The inner wall of the first cup body is also provided with: A first mounting hole, communicating with and coaxially disposed with the first receiving space, is used for detachable connection with a surgical instrument; and / or The second mounting hole is connected to the first accommodating space but not aligned with it. The second mounting hole is a through hole and is used to install bone screws.

12. The acetabular assembly according to any one of claims 1 to 6, characterized in that, The second cup body forms a second receiving space. The cup mouth end face of the second cup body is provided with an anti-dislodgement part. The anti-dislodgement part is connected to the inner wall of the second cup body to form a smooth spherical surface. The spherical surface is used to contact the femoral head prosthesis.

13. A hip joint prosthesis, characterized in that, include: The acetabular assembly as claimed in any one of claims 1 to 12; and A femoral head prosthesis for fitting and mounting to the acetabular liner.

14. A method for assembling the acetabular assembly according to any one of claims 1 to 12, characterized in that, include: A portion of the second cup is placed in the first receiving space so that the acetabular assembly is in a relatively stable pre-positioned state between the outer acetabular cup and the inner acetabular liner, wherein a portion of the anti-rotation part extends into the anti-rotation groove in the pre-positioned state.

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