CN216318225U

CN216318225U - Acetabulum assembly and hip joint prosthesis

Info

Publication number: CN216318225U
Application number: CN202123169820.8U
Authority: CN
Inventors: 曾超; 王春; 丁正; 石杜芳; 刘梦星
Original assignee: Wuhan Mindray Technology Co Ltd
Current assignee: Wuhan Mindray Technology Co Ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-04-19
Anticipated expiration: 2031-12-15

Abstract

The application discloses acetabular component and hip joint prosthesis, an acetabular component, includes: an acetabular outer cup and an acetabular inner liner; the acetabulum outer cup comprises a first cup body, a first accommodating space is formed by the first cup body in a surrounding mode, and an anti-rotation groove is formed in the first cup body and extends to the inner wall of the first cup body from the end face of the cup mouth of the first cup body; the acetabulum liner comprises a second cup body, the second cup body can be accommodated in the first accommodating space, the outer wall of the second cup body is provided with a rotation preventing part, and the rotation preventing part can be matched in the rotation preventing groove; the acetabular component can be in a pre-placement state with relative stability between the acetabular outer cup and the acetabular inner liner, and in the pre-placement state, a part of the rotation-preventing part extends into the rotation-preventing groove along the inward direction of the axis of the first cup body. The application provides an acetabular component, can reduce the probability that the portion of preventing rotating is worn out or reduce the degree that the portion of preventing rotating is worn out in the acetabular component assembling process.

Description

Acetabulum assembly and hip joint prosthesis

Technical Field

The application belongs to the field of medical equipment, and particularly relates to an acetabular component and a hip joint prosthesis.

Background

The hip joint is a joint connecting a femur (i.e., femur) of a human body and a hip bone of a pelvis, and plays an important role when a human walks. For some patients, when the hip joint is damaged due to disease and trauma, the focus can be removed by surgery and a corresponding hip prosthesis can be used to replace the removed hip joint of the patient.

In the related art, hip prostheses include an acetabular component including an acetabular cup for attachment to the patient's hip bone and a liner attached to the acetabular cup. Wherein the liner is typically moved axially of the acetabular cup to fully seat the acetabular cup. A groove is arranged on one end face of the acetabulum cup in the axial direction, and a boss which can be arranged in the groove along the axial movement of the acetabulum cup is arranged on the inner liner. When the liner is completely installed in the acetabular cup, the liner can be limited to rotate around the axis of the acetabular cup relative to the acetabular cup through the matching of the boss and the groove.

However, in the actual operation process, since the assembly of the acetabular cup and the liner is performed in the human body, the visual field of the medical personnel performing the operation is easily blocked and limited, and further, when the liner and the acetabular cup are oriented and positioned, the boss of the liner and the groove of the acetabular cup are easily misaligned in the circumferential direction of the acetabular cup. At this time, if the liner is forcibly installed into the acetabular cup along the axial direction of the acetabular cup, the boss and the acetabular cup are easily interfered and worn, and the stability of the liner and the acetabular cup after installation is further affected.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an acetabulum assembly and a hip joint prosthesis, which can reduce or even avoid the abrasion of an anti-rotation part caused by dislocation in the process of assembling the acetabulum assembly.

In a first aspect, an acetabular component is provided in an embodiment of the application, comprising: an acetabular outer cup and an acetabular inner liner;

the acetabulum outer cup comprises a first cup body, a first accommodating space is formed by the first cup body in a surrounding mode, the first cup body is provided with a rotation preventing groove and a back stopping groove, the rotation preventing groove extends from the cup opening end face of the first cup body to the inner wall of the first cup body, and the back stopping groove is communicated with the first accommodating space;

the acetabulum liner comprises a second cup body, the second cup body can be contained in the first containing space, the outer wall of the second cup body is provided with an anti-rotation part and a clamping part, the anti-rotation part can be matched in the anti-rotation groove, and the clamping part can be matched in the stopping groove;

the acetabulum assembly can be in a relatively stable pre-placement state between the acetabulum outer cup and the acetabulum inner liner, and in the pre-placement state, the clamping part is abutted against the inner wall of the first cup body; and a part of the anti-rotation part extends into the anti-rotation groove.

Optionally, the radial cross-sectional area of the end, away from the bottom of the first cup, of the anti-rotation groove is larger than or equal to the radial cross-sectional area of the end, close to the bottom of the second cup, of the anti-rotation part.

Optionally, the rotation prevention part comprises a second outer wall located on the circumferential direction of the second cup body; wherein the content of the first and second substances,

the second outer wall is inclined in a direction away from the axis of the rotation prevention part along the direction outward from the axis of the second cup body; or

The second outer wall is parallel to an axis of the anti-rotation portion.

Optionally, the number of the anti-rotation grooves is an integral multiple of the number of the anti-rotation parts, and the anti-rotation grooves are uniformly formed in the end face of the cup opening of the first cup body along the circumferential direction of the first cup body.

Optionally, the outer contour line of the radial cross section of the rotation prevention portion is one or a combination of a circular arc line, an elliptic circular arc line, a parabola, an irregular curve and an involute.

Optionally, the second cup is made of a deformable material, and when the acetabular component is in the pre-placement state, the acetabular liner is in a non-deformed state.

Optionally, the rotation preventing groove is communicated with the first accommodating space, and in the pre-placed state, the clamping portion abuts against an inner wall of the rotation preventing groove.

Optionally, in the pre-placed state, along the axis direction of the first cup, the length of the portion of the anti-rotation portion extending into the anti-rotation groove is 0.1 mm to 2.5 mm.

Optionally, the inner wall of the first accommodating space includes a first conical surface connected to the rim end surface of the first cup body, and an inner diameter of the first conical surface gradually increases toward the notch along the bottom of the first cup body; the outer wall of the second cup body comprises a second conical surface, and the first conical surface and the second conical surface are matched in size.

Optionally, the first conical surface and the second conical surface are in transition fit or interference fit.

Optionally, the clamping part is arranged at one end of the outer wall of the second cup body, which is far away from the bottom of the second cup body; or

The clamping part is arranged at one end, close to the bottom of the second cup body, of the second conical surface.

Optionally, the fastening portion is an annular boss disposed along a circumferential direction of the second cup body.

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

the first mounting hole is communicated with the first accommodating space and is coaxially arranged, and the first mounting hole is used for being detachably connected with a surgical instrument; and/or

The second mounting hole is communicated with the first accommodating space and is not coaxial, the second mounting hole is a through hole, and the second mounting hole is used for mounting a bone nail.

Optionally, the second cup body surrounds to form a second accommodating space, an anti-dropping part is arranged on the end face of the cup mouth of the second cup body, the anti-dropping part is connected with the inner wall of the second cup body to form a smooth spherical surface, and the spherical surface is used for contacting with a femoral head prosthesis.

In a second aspect, embodiments of the present application further provide an acetabular component, including: an acetabular outer cup and an acetabular inner liner;

the acetabulum outer cup comprises a first cup body, a first accommodating space is formed by the first cup body in a surrounding mode, and an anti-rotation groove is formed in the first cup body and extends from the cup opening end face of the first cup body to the inner wall of the first cup body;

the acetabulum liner comprises a second cup body, the second cup body can be accommodated in the first accommodating space, the outer wall of the second cup body is provided with a rotation preventing part, and the rotation preventing part can be matched in the rotation preventing groove;

the acetabular component can be in a relatively stable pre-placement state between the acetabular outer cup and the acetabular inner liner, and in the pre-placement state, a part of the rotation prevention portion extends into the rotation prevention groove.

In a third aspect, embodiments of the present application also provide a hip prosthesis, comprising:

the acetabular component of any of the first or second aspects; and

and the femoral head prosthesis is used for being matched and installed with the acetabulum liner.

The acetabular component in the embodiment of the application can be in a relatively stable state through the inner wall butt of the clamping part and the first containing space so that the acetabular outer cup and the acetabular inner lining are in a pre-placing state, and the part of the rotation preventing part is located in the rotation preventing groove to realize the pre-positioning of the acetabular outer cup and the acetabular inner lining in the circumferential direction of the acetabular outer cup, so that medical personnel who perform operations can conveniently and accurately pack the acetabular inner lining into the first containing space along the axial direction of the acetabular outer cup. In contrast, the acetabular liner and the acetabular cup of the related art acetabular assembly are prone to misalignment in the circumferential direction of the acetabular cup, which can result in wear of the rotation prevention portion during installation into the rotation prevention groove. Therefore, the acetabular component provided by the embodiment of the application can reduce or even avoid abrasion of the anti-rotation part caused by dislocation in the installation process of the acetabular component, and further improves the stability of the assembled acetabular component.

Drawings

The technical solutions and advantages of the present application will become apparent from the following detailed description of specific embodiments of the present application when taken in conjunction with the accompanying drawings.

Fig. 1 is a schematic structural diagram of a hip joint prosthesis provided in an embodiment of the present application.

Figure 2 is an assembly view of the acetabular component of the hip prosthesis shown in figure 1.

Figure 3 is an exploded view of the acetabular assembly shown in figure 2.

FIG. 4 is a schematic view of the acetabular assembly of FIG. 2 shown in a pre-positioned state.

Figure 5 is a cross-sectional view of the acetabular assembly of figure 4 taken along the direction A-A.

Figure 6 is an enlarged partial view at X of the cross-sectional view of the acetabular component shown in figure 5.

Figure 7 is a schematic view of the acetabular liner of the acetabular assembly of figure 2.

Figure 8 is a cross-sectional view of the acetabular liner of figure 7 taken along direction B-B.

FIG. 9 is a schematic view of the acetabular outer cup of the acetabular assembly of FIG. 2.

Fig. 10 is a flowchart of an acetabular component assembly method provided by an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides an acetabulum assembly which is applied to a hip joint prosthesis. Hip prostheses are used to replace the hip joint in the body of a user. For example, for some patients, when the hip joint is damaged due to disease and trauma, the lesion may be surgically removed and a corresponding hip prosthesis may be used to replace the removed hip joint of the patient.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a hip prosthesis according to an embodiment of the present disclosure. The hip prosthesis may include an acetabular component 100 and a femoral head prosthesis 200. The acetabular assembly 100 is for fixation to a pelvic bone of a patient to replace a resected acetabulum of the patient. The femoral head prosthesis 200 is intended to be secured to a patient's femur to replace the resected femoral head of the patient. At this time, the femoral head prosthesis 200 is rotatably mounted on the acetabular component 100, so that the hip joint prosthesis can replace the resected hip joint of the patient, and the patient can complete corresponding daily actions by matching the hip joint prosthesis with the muscle tissue of the patient.

As shown in fig. 1, femoral head prosthesis 200 may include a ball head 21, and ball head 21 may have a shape that resembles the shape of a femoral head. The ball head 21 may be directly connected to the femur by fasteners such as screws or the like.

Optionally, femoral head prosthesis 200 may also include femoral stem 22. One end of the femoral stem 22 is fixedly connected with the ball head 21, and the other end of the femoral stem 22 is fixedly connected with the femur of the patient.

As shown in fig. 1, the femoral stem 22 may have a bent structure including a first segment 221 and a second segment 222 disposed obliquely to the first segment 221. Second segment 222 can be adapted to be fixedly coupled to a surface of a patient's femur or can have a predetermined hole in the femur, with second segment 222 being integrally inserted into the predetermined hole in the femur and second segment 222 being fixedly coupled to the femur by fasteners such as screws. At this time, the second section 222 can increase the connection fitting area of the femoral head prosthesis 200 and the femur of the patient, so that the femoral head prosthesis 200 and the femur of the patient can be more stably connected.

The first section 221 and the ball head 21 may be integrally formed, so that the femoral stem 22 and the ball head 21 have higher integral strength. Alternatively, the femoral stem 22 and the ball head 21 may be separately manufactured and then fixed, for example, the free end of the first segment 221 is provided with an external thread, and 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 into the first threaded hole 211 of the ball head 21.

Referring to fig. 2 and 3, fig. 2 is an assembly view of an acetabular component of the hip prosthesis shown in fig. 1, and fig. 3 is an exploded view of the acetabular component shown in fig. 2.

As shown in fig. 2 and 3, the acetabular assembly 100 may include an acetabular outer cup 11 and an acetabular inner liner 12. The acetabular cup 11 is intended to be fitted and fixed to the pelvic bone of a patient. The acetabular outer cup 11 forms a first receiving space 111 with an opening facing away from the pelvis of the patient, and the acetabular liner 12 is at least partially fixed in the first receiving space 111. The acetabular liner 12 is formed with a second receiving space 121 so that the ball head 21 can be rotatably mounted in the second receiving space 121. Further, the acetabular component 100 fixedly disposed at the pelvic bone of the patient is rotationally coupled to the femoral head prosthesis 200 fixedly disposed at the femur of the patient to replace the resected hip joint of the patient.

Illustratively, as shown in FIG. 3, the acetabular outer cup 11 includes a first cup 112. The first cup 112 surrounds and forms a first receiving space 111. The first cup 112 is provided with a rotation preventing groove 113 and a withdrawal stopping groove 114. Anti-rotation groove 113 extends from the rim end surface of first cup 112 to the inner wall of first cup 112. The retaining groove 114 communicates with the first accommodation space 111. The acetabular liner 12 includes a second cup 122. The second cup 122 may be received in the first receiving space 111. The outer wall of the second cup 122 is provided with a rotation preventing portion 123 and a fastening portion 124. The rotation preventing portion 123 can be fitted, such as caught, in the rotation preventing groove 113. Further, after the second cup 122 is completely received in the first receiving space 111, the rotation of the second cup 122 relative to the first cup 112 in the axial direction of the first cup 112 can be restricted by the rotation preventing portion 123 contacting the inner wall of the rotation preventing groove 113. The catching portion 124 can be fitted, such as caught, in the retaining groove 114. Further, after the second cup 122 is completely received in the first receiving space 111, the engaging portion 124 engages with the inner wall of the retaining groove 114 to restrict the second cup 122 from moving linearly relative to the first cup 112 along the axial direction of the first cup 112.

Therefore, after the acetabular liner 12 is completely installed in the first accommodation space 111, the acetabular liner 12 and the acetabular outer cup 11 can be fixedly connected through the matching of the anti-rotation portion 123 and the anti-rotation groove 113 and the matching of the clamping portion 124 and the retaining groove 114.

During assembly of the acetabular assembly 100, the acetabular assembly 100 may be in a relatively stable pre-positioned state between the acetabular cup 11 and the acetabular liner 12 when the first cup 112 of the acetabular liner 12 is only partially within the first receptacle space 111. At this point, applying a force to the acetabular liner 12 in a direction inward of the axis of the first cup 112 causes the acetabular liner 12 to move in a direction inward of the axis of the first cup 112 until the rotation prevention portion 123 is fully seated in the rotation prevention groove 113 and the second cup 122 is fully seated in the first receiving space 111.

Referring to fig. 4-6, fig. 4 is a schematic structural view of the acetabular component of fig. 2 in a pre-positioned state, fig. 5 is a cross-sectional view of the acetabular component of fig. 4 taken along a direction a-a, and fig. 6 is a partial enlarged view of the acetabular component of fig. 5 taken at a cross-sectional view X.

In some embodiments, as shown in fig. 6, to reduce the probability that the rotation prevention portion 123 will be worn or even damaged during installation of the acetabular liner 12 and acetabular cup 11, a portion of the rotation prevention portion 123 extends into the rotation prevention groove 113 in the pre-placement state.

It will be appreciated that since the assembly of the acetabular cup 11 and the acetabular liner 12 is typically performed in the patient's body, the view of the health care provider performing hip surgery on the acetabular cup 11 and the acetabular liner 12 is easily limited when assembled, and the positioning of the rotation preventing portions 123 and the rotation preventing grooves 113 in the circumferential direction of the acetabular cup 11 is achieved by the health care provider. Therefore, in the pre-set state, if the rotation preventing portion 123 is completely located outside the rotation preventing groove 113, the rotation preventing portion 123 and the rotation preventing groove 113 are likely to be angularly displaced in the circumferential direction. At this time, if the acetabular liner 12 is forcibly fitted into the acetabular cup 11, the rotation preventing portion 123 is likely to interfere with the notch end face of the rotation preventing groove 113, and the rotation preventing portion 123 is worn or even damaged by being pressed, which eventually affects the stability of the acetabular liner 12 and the acetabular cup 11 after fitting.

In contrast, in the pre-placement state, if the rotation preventing portion 123 is partially located in the rotation preventing groove 113, the acetabulum outer cup 11 and the acetabulum inner liner 12 can be pre-positioned in the circumferential direction of the acetabulum outer cup 11, so that the medical staff performing the operation can conveniently and accurately insert the acetabulum inner liner 12 into the first accommodating space 111 along the axial direction of the acetabulum outer cup 11. On the other hand, during the process of switching the acetabular component 100 from the pre-placement state to the process of completely installing the second cup 122 in the first accommodation space 111, the acetabular component 100 provided by the embodiment of the application can avoid the rotation prevention part 123 from being worn or even damaged by the notch end face of the rotation prevention groove 113.

In the embodiment of the present invention, the relatively stable state of the acetabular outer cup 11 and the acetabular inner liner 12 may be realized by the fastening portion 124 abutting against the inner wall of the first cup 112, or may be realized by other guiding structures, which is not limited in the embodiment of the present invention.

Taking the case that the clamping portion 124 abuts against the inner wall of the first cup 112 so that the acetabular outer cup 11 and the acetabular inner liner 12 are in a relatively stable state: the pre-set state is a state in which the engaging portion 124 is just in contact with the inner wall of the first cup 112 in the process of placing the second cup 122 into the first receiving space 111 along the axial direction of the first cup 112. That is, the pre-set state is not an intermediate state between the clamping portion 124 and the inner wall of the first cup 112 just before the clamping portion 124 is clamped into the retaining groove 114.

In some embodiments, a notch portion of the rotation preventing groove 113 is formed at a rim end surface of the first cup 111, so that the rotation preventing portion 123 may be placed in the rotation preventing groove 113 during the process of placing the second cup 122 into the first receiving space 111 in the axial direction of the first cup 112.

On the other hand, the rotation preventing groove 113 may be communicated with the first receiving space 111, that is, a notch of the rotation preventing groove 113 may be partially formed on the inner wall of the first cup 112. At this time, the inner wall of the rotation preventing groove 113 may also be understood as a portion of the inner wall of the first cup 112. Therefore, in the pre-set state, the fastening portion 124 is in contact with the inner wall of the first cup 112, which means that the fastening portion 124 is in contact with the inner wall of the rotation preventing groove 113. For example, in the pre-set state, the trim portion 124 may abut to a side of the inner wall of the rotation preventing groove 113 that faces the rim end surface of the first cup 112.

The notch end edge of the rotation-preventing groove 113 may be provided with a chamfer, and the chamfer surface of the chamfer may surround a formed space, which may also be understood as a groove inner space of the rotation-preventing groove 113.

In the pre-set state, a distance of a portion of the rotation preventing part 123 extending into the rotation preventing groove 113 in the axial direction of the first cup 112 may be 0.1 mm to 2.5 mm.

It will be appreciated that in the pre-positioned state, a force may be applied to the acetabular liner 12 in an inward direction along the axis of the first cup 112 to force the acetabular liner 12 to fully seat within the first receiving space 111. However, in actual assembly, it is objectively difficult for the direction of the force applied by the healthcare worker to coincide with the axis of the first cup 112.

Therefore, when the distance of the portion of the rotation-preventing part 123 extending into the rotation-preventing groove 113 is less than 0.1 mm along the axial direction of the first cup 112, the overlapping portion of the rotation-preventing part 123 and the rotation-preventing groove 113 is too small, that is, the portion of the inner wall of the rotation-preventing groove 113 capable of limiting the rotation-preventing part 123 is small. At this time, if the force applied by the medical staff is deviated by a certain angle, the rotation preventing part 123 may be separated from the rotation preventing groove 113 and collide and rub against the inner wall of the rotation preventing groove 113. Moreover, when the rotation preventing portion 123 is partially moved out of the rotation preventing groove 113, the medical staff continues to apply force to the acetabular liner 12, which may cause the rotation preventing portion 123 to rub or collide with the notch end face of the rotation preventing groove 113.

It will also be appreciated that in the pre-positioned state, if the distance of the portion of the rotation-preventing portion 123 extending into the rotation-preventing groove 113 is greater than 2.5 mm along the axial direction of the first cup 112, it means that the medical staff will manually swing the rotation-preventing portion 123 deeper into the rotation-preventing groove 113. At this time, as the depth of the rotation preventing part 123 that needs to be swung into the rotation preventing groove 113 increases, the possibility that the rotation preventing part 123 rubs and interferes with the inner wall of the rotation preventing groove 113 during swinging is increased.

On the other hand, in the pre-placement state, the fastening portion 124 abuts against the inner wall of the first cup 112, so that the acetabular shell 11 provides a first supporting force to the acetabular liner 12, and the medical staff gripping the acetabular liner 12 feels the first supporting force to determine that the acetabular component 100 is in the pre-placement state. If the rotation-preventing portion 123 needs to be swung into a deeper position in the rotation-preventing groove 113 in the pre-placement state, the probability that the fastening portion 124 is not yet in contact with the inner wall of the first cup 112 and the rotation-preventing portion 123 is in contact with the inner wall of the rotation-preventing groove 113 is increased. At this time, when the rotation preventing portion 123 contacts the inner wall of the rotation preventing groove 113 and the acetabular shell 11 provides the acetabular liner 12 with the second supporting force, the medical staff holding the acetabular liner 12 may mistakenly use the second supporting force as the first supporting force and assume that the acetabular component 100 is in the pre-placement state. At this time, if the acetabular liner 12 is forcibly fitted into the acetabular cup 11, the inner walls of the rotation-preventing portions 123 and/or the rotation-preventing grooves 113 may be worn seriously, or even may be deformed by mutual compression, which may affect the subsequent installation of the acetabular component 100.

In some embodiments, the acetabular outer cup 11 may be a rigid material such as a titanium alloy and the acetabular liner 12 may be a flexible material such as polyethylene. The pre-set state can be understood as a state in which the locking portion 124 is just abutting against the inner wall of the first cup 112 during the process of inserting the acetabular liner 12 into the first receiving space 111 in the axial inward direction of the first cup 112. Thus, in the pre-positioned state, the acetabular liner 12 is in a non-deformed state. At this time, the acetabular liner 12 is inserted into the first receiving space 111 in an inward direction along the axis of the first cup 112, and the acetabular liner 12 may be elastically deformed. Until the acetabular liner 12 and the acetabular outer cup 11 are assembled, the clamping part of the acetabular liner 12 can be restored to an undeformed state through elastic restoration and clamped in the retaining groove 114.

For example, the first accommodating space 111 may be a hemispherical groove, the first accommodating space 111 may also be a truncated cone-shaped groove, and the first accommodating space 111 may also be a groove having a truncated cone-shaped end close to the notch and a hemispherical end far away from the notch. Therefore, the inner diameter of the first accommodating space 111 is gradually reduced inward along the axis of the first cup 112, that is, the portion of the inner wall of the first cup 112 connected to the rim end surface of the first cup 112 is inclined with respect to the axis of the first cup 112.

As shown in fig. 6, when the second cup 122 of the acetabular liner 12 is moved to the pre-positioned state of the acetabular component 100 in an inward direction along the axis of the first cup 112, the snap feature 124 abuts a portion of the inner wall of the first cup 112 that is connected to the rim end surface of the first cup 112. At this time, the inner wall of the first cup 112 can apply a supporting force to the clamping portion 124, so that the position between the acetabular liner 12 and the acetabular cup 11 is relatively stable when the acetabular component 100 is in the pre-placement state.

In order to allow a part of the rotation preventing portion 123 to protrude into the rotation preventing groove 113 in the direction inward of the axis of the first cup 112 in the pre-set state, the thickness of the rotation preventing portion 123 in the direction inward of the axis of the second cup 122 may be increased in the case where the trim portion 124 abuts to a specific position of the inner wall of the first cup 112. Further, in the pre-set state, the rotation preventing portion 123 may be partially located in the rotation preventing groove 113 from being completely located outside the rotation preventing groove 113.

Accordingly, the depth of the anti-rotation groove 113 in the axial direction of the first cup 112 may be increased to allow the anti-rotation portion 123 to fully seat in the anti-rotation groove 113 when the acetabular component 100 is assembled.

Alternatively, in the case where the thickness of the rotation preventing portion 123 in the direction inward of the axis of the second cup 122 is determined and the size of the first accommodating space is determined, the thickness of the locking portion 124 in the radial direction of the acetabular liner 12 may be reduced, and further, in the pre-set state, the depth of the second cup 122 extending into the first accommodating space 111 may be increased. Accordingly, the rotation prevention part 123 also moves following the second cup 122. So that the rotation preventing part 123 may be partially positioned in the rotation preventing groove 113 from being completely positioned outside the rotation preventing groove 113 in the pre-set state.

In the actual production process of the acetabular component 100, only the above-mentioned scheme of reducing the thickness of the fastening portion 124 in the radial direction of the acetabular liner 12 may be adopted, only the scheme of increasing the thickness of the rotation preventing portion 123 in the axial direction of the second cup 122 may be adopted, the scheme of simultaneously reducing the thickness of the fastening portion 124 in the radial direction of the acetabular liner 12 and increasing the thickness of the rotation preventing portion 123 in the axial direction of the second cup 122 may be adopted, and the scheme of changing other parameters or shapes of the acetabular outer cup 11 and the acetabular liner 12 may also be adopted. It is understood that any technical solution that a portion of the rotation-preventing portion 123 extends into the rotation-preventing groove 113 in the pre-placing state in an inward direction along the axis of the first cup 112 is within the protection scope of the embodiment of the present application.

As shown in fig. 6, in order to reduce the probability of the rotation preventing part 123 being worn during the installation of the acetabular liner 12 and the acetabular cup 11, the rotation preventing part 123 may not contact the inner wall of the rotation preventing groove 113 in the pre-placement state.

For example, the radial cross-section of the rotation preventing groove 113 at the end away from the bottom of the first cup 112 is larger than the radial cross-section of the rotation preventing portion 123 at the end near the bottom of the second cup 122. Therefore, in the process that the acetabular liner 12 moves from being completely outside the first accommodating space 111 to being in the pre-placement state, the rotation preventing part 123 does not contact with the inner wall of the rotation preventing groove 113, and the probability that the rotation preventing part 123 is worn by the inner wall of the rotation preventing groove 113 is reduced.

Of course, it can be understood that, in the actual operation process, the acetabular outer cup 11 and the acetabular inner liner 12 are placed in the pre-placement state by the medical staff, so that even if the radial cross section of the end of the rotation preventing groove 113 far away from the cup bottom of the first cup 112 is larger than the radial cross section of the end of the rotation preventing part 123 near the cup bottom of the second cup 122, in the pre-placement state, the rotation preventing part 123 may still contact and wear with the inner wall of the rotation preventing groove 113 to a certain extent. However, in an objective manner, since the radial cross section of the rotation-preventing groove 113 at the end far away from the bottom of the first cup 112 is larger than the radial cross section of the rotation-preventing portion 123 at the end near the bottom of the second cup 122, the probability of the rotation-preventing portion 123 being worn during the installation of the acetabular liner 12 and the acetabular cup 11 can be reduced.

On the other hand, to enable the rotation prevention portion 123 to abut against the sidewall of the rotation prevention groove 113 to limit relative rotation between the acetabular liner 12 and the acetabular cup 11 after the acetabular assembly 100 is assembled, a radial cross-section of an end of the rotation prevention groove 113 away from the bottom of the first cup 112 may be substantially the same as a radial cross-section of an end of the rotation prevention portion 123 away from the bottom of the second cup 122. Therefore, when the acetabular component 100 is assembled, the rotation-preventing portion 123 and the inner wall of the rotation-preventing groove 113 are in clearance fit, interference fit or transition fit in size.

The radial section of the anti-rotation groove 113 can be understood as a section of the anti-rotation groove 113 perpendicular to the axis of the first cup 112, and the section of the anti-rotation groove 113 parallel to the rim end surface of the first cup 112. The radial section of the rotation prevention part 123 described above can be understood as a section perpendicular to the axis of the second cup 122.

In some embodiments, as shown in fig. 3, the anti-rotation portion 123 includes a second outer wall 1231 positioned circumferentially about the second cup 122. In a direction outward of the axis of the second cup 122, the second outer wall 1231 is inclined away from the axis of the rotation prevention part 123. Therefore, as shown in fig. 6, the width of the end of the rotation preventing part 123 far from the bottom of the second cup 122 in the radial direction of the second cup 122 is larger than the width of the end of the rotation preventing part 123 near the bottom of the second cup 122 in the radial direction of the second cup 122.

Of course, in some other embodiments, the radial cross-section of the rotation prevention part 123 is the same in all places along the axial direction of the first cup 112, i.e. the axial directions of the second outer wall 1231 and the rotation prevention part 123 are parallel to each other.

Referring to fig. 7 and 8, fig. 7 is a schematic view of the acetabular liner of the acetabular assembly of fig. 2, and fig. 8 is a cross-sectional view of the acetabular liner of fig. 7 taken along the direction B-B.

As shown in fig. 8, the outer contour line 1232 of the radial cross section of the rotation prevention part 123 may be one or more combinations of a circular arc line, an elliptical arc line, a parabola line, an irregular curve line and an involute curve. For example, the rotation preventing portion 123 may be a semi-circular truncated cone as a whole, a connecting portion of the semi-circular truncated cone and the circumferential outer wall of the second cup 122 is rounded, and at this time, the outer contour line 1232 of the radial cross section of the rotation preventing portion 123 is composed of three circular arc lines with different circular centers.

On the other hand, the rotation preventing groove 113 may be a contour groove having a shape similar to the rotation preventing portion 123. For example, the outer contour 1232 of the radial cross section of the rotation preventing part 123 is a first parabola, and the inner wall contour of the radial cross section of the rotation preventing groove 113 is a second parabola similar to the first parabola. Alternatively, the outer contour line 1232 of the radial cross section of the rotation preventing part 123 is a first involute, and the inner wall contour line of the radial cross section of the rotation preventing groove 113 is a second involute similar to the first parabola, which is not limited in the embodiment of the present application.

As shown in fig. 3, the number of the anti-rotation grooves 113 is an integral multiple of the number of the anti-rotation portions 123, and the plurality of anti-rotation grooves 113 are uniformly formed in the rim end surface of the first cup 112 along the circumferential direction of the first cup 112.

For example, the rotation-preventing grooves 113 include a first rotation-preventing groove, a second rotation-preventing groove and a third rotation-preventing groove adjacent to each other, and the rotation-preventing portion 123 may include a first rotation-preventing portion. After the acetabular outer cup 11 is fixed to the pelvis of a patient, the first anti-rotation portion may be clamped in the first anti-rotation groove, or the second cup body 122 may rotate around the axis of the first cup body 112 by a certain angle, so that the first anti-rotation portion is clamped in the second anti-rotation groove or the third anti-rotation groove. Furthermore, when there is a certain angle error in the installation of the femoral head prosthesis 200, a specific rotation prevention part 123 can be inserted into different rotation prevention grooves 113 to adjust the angle of the acetabular liner 12, thereby improving the matching accuracy of the acetabular liner 12 and the femoral head prosthesis 200. Therefore, the acetabular component 100 provided by the embodiment of the application has the advantages of being convenient to adjust and high in fault tolerance rate.

Illustratively, as shown in fig. 3 and 4, the number of the anti-rotation grooves 113 may be twelve, and the number of the anti-rotation portions 123 may be twelve, six, four, or three. Of course, the number of the rotation preventing grooves 113 may be six, and the number of the rotation preventing portions 123 may be six, three, or one. It is understood that the number of the rotation preventing grooves 113 and the number of the rotation preventing parts 123 are not limited in the embodiments of the present application.

As shown in fig. 5, the inner wall of first cup 112 includes a first tapered surface 115 that connects to the rim end surface of the first cup. The inner diameter of the first tapered surface 115 gradually increases toward the rim along the bottom of the first cup 112. Accordingly, the outer wall of the second cup 122 includes a second tapered surface 125. The first tapered surface 115 and the second tapered surface 125 are cooperatively dimensioned.

The first tapered surface 115 and the second tapered surface 125 may be configured to have an interference fit or a transition fit. Further, when the second cup 122 is fully seated in the first receiving space 111, the acetabular component 100 may be made more rigid by the engagement of the first tapered surface 115 and the second tapered surface 125.

As shown in fig. 5, the inner wall of the first cup 112 may further include a first spherical surface 116, the first spherical surface 116 is connected to the adjacent end edge of the first tapered surface 115 over the entire circumference, and the first spherical surface 116 and the first tapered surface 115 surrounding the first spherical surface 116 enclose the first receiving space 111. Correspondingly, the outer wall of the first cup 112 further includes a second spherical surface 126 attached to the first spherical surface 116.

Alternatively, the inner wall of the first cup 112 may further include a first plane surface instead of the first spherical surface 116, and the first accommodating space 111 is defined by the first plane surface and the first tapered surface 115 disposed around the first plane surface. It is understood that the shape of the first accommodating space 111 is not limited in the embodiments of the present application.

Referring to fig. 9, fig. 9 is a schematic structural view of an acetabular outer cup of the acetabular assembly shown in fig. 2. The inner wall of first cup 112 may also be provided with a first mounting hole 117. The first mounting hole 117 is communicated with the first receiving space 111 and is coaxially disposed. The first mounting hole 117 may be a through hole or a blind hole, which is not limited in the embodiment of the present application. The first mounting hole 117 is adapted to detachably couple to a surgical instrument.

The operation of the first mounting hole 117 will be further explained in conjunction with the surgical procedure as follows:

the first mounting hole 117 may be a threaded hole. In the actual operation process, firstly, the medical staff can extend a threaded rod as a surgical instrument into the patient and connect the threaded rod in the first mounting hole 117, and at the moment, the medical staff can press and fix the acetabulum outer cup 11 on the pelvis of the patient through the threaded rod. The health care provider may then lock the acetabular outer cup 11 to the patient's pelvis. Finally, the threaded rod is screwed out of the first mounting hole 117, and the installation of the acetabular outer cup 11 is completed.

Alternatively, the first mounting hole 117 may not be a threaded hole. Correspondingly, a rod piece capable of being sleeved, clamped or magnetically attracted into the first mounting hole 117 can be used as a surgical instrument instead of the threaded rod, and therefore the first mounting hole 117 can be detachably connected with the surgical instrument. It is understood that the embodiments of the present application are not limited to the type of surgical instrument and the manner in which the surgical instrument is removably coupled into the first mounting hole 117.

As shown in fig. 9, the inner wall of the first cup 112 may also be provided with a second mounting hole 118. The second mounting hole 118 communicates with the first receiving space 111 and is not coaxially disposed. The second mounting hole 118 is a through hole, and the second mounting hole 118 is used for mounting the bone nail 300.

The operation of the second mounting hole 118 is further explained below in connection with the surgical procedure: first, the health care provider places the acetabular cup 11 on the patient's pelvis. The health care provider may then threadably secure the acetabular cup 11 to the patient's pelvis with bone screw 300.

Wherein the second mounting hole 118 may be a threaded hole such that a portion of the bone screw 300 is threadedly fixed with the pelvis of the patient and another portion of the bone screw 300 is threadedly coupled to an inner wall of the second mounting hole 118.

Alternatively, the second mounting hole 118 may be a counter-bore, and when the bone screw 300 is threaded into the patient's pelvis, the nut of the bone screw 300 is sunk into the second mounting hole 118 and locks the acetabular cup 11 to the patient's pelvis. Of course, when the nut of the bone nail 300 is sunk into the second mounting hole 118, the nut of the bone nail 300 may also be provided with external threads on the side wall thereof and screwed into the internal threads on the inner wall of the countersunk hole, so as to further increase the stability of the connection between the acetabular cup 11 and the pelvis.

It is understood that the hole shape of the second installation hole 118 is not limited in the embodiments of the present application, and any technical solution that can lock the acetabular cup 11 and the pelvic bone of the patient through the bone nail 300 installed on the second installation hole 118 is within the protection scope of the embodiments of the present application.

The number of the second installation holes 118 may be one, two, or three, which is not limited in the embodiments of the present application, and any technical solution that can lock the acetabular cup 11 with the pelvic bone of the patient through the bone nails 300 installed on the second installation holes 118 is within the protection scope of the embodiments of the present application.

The trim portion 124 and the second cup 122 may be formed by separate manufacturing and assembly.

Alternatively, as shown in fig. 3, the clamping portion 124 and the second cup 122 may be integrally formed, and it is understood that the integral forming can reduce the number of parts of the acetabular liner 12, thereby simplifying the steps of assembling the acetabular component 100 to reduce the difficulty of the hip joint surgery.

As shown in fig. 3, the fastening portion 124 can be disposed on an end of the outer wall of the second cup 122 away from the bottom of the second cup 122. The clamping portion 124 can also be disposed on an end of the outer wall of the second cup 122 near the bottom of the second cup 122. Of course, the fastening portion 124 may also be disposed in the middle of the outer wall of the second cup 122 along the axial direction of the second cup 122, which is not limited in this embodiment.

For example, the outer wall of the second cup 122 includes a second tapered surface 125, as shown in fig. 3, the fastening portion 124 may be disposed at an end of the second tapered surface 125 away from the bottom of the second cup 122. The clamping portion 124 can also be disposed on an end of the second tapered surface 125 near the bottom of the second cup 122. Of course, the fastening portion 124 may also be disposed in the middle of the second tapered surface 125 along the axial direction of the second cup 122, which is not limited in this embodiment.

As shown in fig. 3, the fastening portion 124 may be an annular boss disposed along the circumferential direction of the second cup 122, and correspondingly, the first receiving space 111 is an annular groove disposed around the circumferential direction of the first tapered surface 115.

Of course, the fastening portion 124 may include a plurality of arc-shaped bosses, and the plurality of arc-shaped bosses are uniformly or non-uniformly arranged along the circumferential direction of the second cup 122, which is not limited in this embodiment. For example, the trim portion 124 may include a plurality of arc-shaped bosses abutting to a side of the inner wall of the rotation preventing groove 113 facing the rim end surface of the first cup 112 in the pre-set state.

As shown in fig. 3, the second cup 122 has a stopper 127 on the rim end surface. The anti-slip portion 127 is coupled to the inner wall of the second cup 122 to form a smooth third spherical surface 129, and the third spherical surface 129 is configured 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, and the anti-slip part 127 is arranged to increase the contact area between the acetabular liner 12 and the ball head 21, so as to reduce the probability of separation from the second receiving space 121 during rotation of the ball head 21, and further improve the stability of the hip joint prosthesis after the operation.

The projection of the anti-drop part 127 on the rim end surface of the second cup 122 is an arc structure. The arc may be a semi-circular arc or a minor arc. The height of the retaining portion 127 may be gradually smaller from the middle of the arc toward both sides in the direction outward from the axis of the second cup 122.

Optionally, the anti-dropping portion 127 may not be disposed on the cup opening end surface of the second cup 122, which is not limited in this embodiment of the application.

As shown in fig. 3, the inner wall of the second cup 122 and the rim end surface of the second cup 122 may also be partially provided with a first chamfer 128. Taking femoral head prosthesis 200 including femoral stem 22 as an example. During the rotation of the femoral stem 22 along with the ball head 21, the first chamfer 128 can serve as an escape space for the rotation of the femoral stem 22, so as to enlarge the rotation angle of the femoral head prosthesis 200.

Alternatively, the inner wall of the second cup 122 and the rim end surface of the second cup 122 may not be provided with the first chamfer 128. Alternatively, the first chamfer 128 and the retaining portion 127 may be provided on the second cup 122 at the same time. For example, the first chamfer 128 and the retaining portion 127 are disposed on opposite sides of the axis of the acetabular liner 12.

For example, the femoral stem 22 may be rotated in a first direction (counterclockwise in fig. 1) to abut the first chamfer 128. In contrast, if the first chamfer 128 is not chamfered, the angle through which the femoral stem 22 can be rotated in the first direction is reduced.

Referring to fig. 10, fig. 10 is a flowchart of an acetabular component assembly method according to an embodiment of the present disclosure.

Prior to actual hip surgery, the acetabular component 100 may also be assembled outside of the patient's body, such as by a manufacturer during production testing, or by pre-assembling the acetabular component 100 for ease of transport and turnaround. To this end, for the case that the acetabular component 100 is assembled outside the patient, the present application also provides an assembly method implemented based on the acetabular component, including:

101. an acetabular outer cup 11 and an acetabular inner liner 12 are obtained.

The acetabular cup 11 is the acetabular cup 11 described above, and the acetabular liner 12 is the acetabular liner 12 described above.

102. A portion of the first cup 112 is disposed in the first receiving space 111 to allow the acetabular component 100 to be in a relatively stable pre-positioned state between the acetabular shell 11 and the acetabular liner 12.

In the pre-set state, a part of the rotation preventing portion 123 extends into the rotation preventing groove 113.

103. First cup 112 is completely fitted into first accommodation space 111 in the direction inward of the axis of first cup 112.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

While the present disclosure provides an acetabular component 100 and a hip prosthesis, and the present disclosure provides an example of the principles and implementations of the present disclosure, the above description of the example is only provided to help understand the method and the core concept of the present disclosure; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. An acetabular component, comprising: an acetabular outer cup and an acetabular inner liner;

the acetabulum assembly can be in a pre-placement state with relative stability between the acetabulum outer cup and the acetabulum inner liner, in the pre-placement state, the clamping and fixing part is abutted against the inner wall of the first cup body, and part of the rotation preventing part extends into the rotation preventing groove.

2. The acetabular assembly of claim 1, wherein a radial cross-sectional area of an end of the anti-rotation groove distal to a bottom of the first cup is greater than or equal to a radial cross-sectional area of an end of the anti-rotation portion proximal to a bottom of the second cup.

3. The acetabular assembly of claim 2, wherein the rotation prevention portion includes a second outer wall located circumferentially to the second cup; wherein the content of the first and second substances,

The second outer wall is parallel to an axis of the anti-rotation portion.

4. The acetabular component according to claim 1, wherein the number of the anti-rotation grooves is an integral multiple of the number of the anti-rotation portions, and a plurality of the anti-rotation grooves are uniformly arranged on the cup mouth end surface of the first cup body along the circumferential direction of the first cup body.

5. The acetabular assembly of claim 1, wherein an outer contour of a radial cross-section of the rotation prevention portion is one or more combinations of a circular arc, an elliptical arc, a parabola, an irregular curve, and an involute.

6. The acetabular assembly of claim 1, wherein the second cup is a deformable material and the acetabular liner is in a non-deformed state when the acetabular assembly is in the pre-positioned state.

7. The acetabular component of claim 1, wherein the rotation prevention groove is in communication with the first receiving space, and the locking portion abuts against an inner wall of the rotation prevention groove in the pre-placement state.

8. The acetabular assembly of any one of claims 1-7, wherein a length of a portion of the rotation prevention portion extending into the rotation prevention groove in an axial direction of the first cup in the pre-placement state is 0.1 mm to 2.5 mm.

9. The acetabular assembly of any of claims 1-7, wherein the inner wall of the first cup includes a first tapered surface connected to the rim end surface of the first cup, the first tapered surface having an inner diameter that increases in a direction toward the rim along the bottom of the first cup; the outer wall of the second cup body comprises a second conical surface, and the first conical surface and the second conical surface are matched in size.

10. The acetabular assembly of claim 9, wherein the first tapered surface and the second tapered surface transition fit or interference fit.

11. The acetabular assembly of claim 9, wherein the retaining portion is disposed on an end of the outer wall of the second cup that is distal from a bottom of the second cup; or

12. The acetabular assembly of any of claims 1-7, wherein the capture portion is an annular boss disposed circumferentially along the second cup.

13. The acetabular assembly of any of claims 1-7, wherein the inner wall of the first cup further defines:

14. The acetabular assembly of any one of claims 1-7, wherein the second cup surrounds a second receiving space, and a retaining portion is provided on an end surface of the second cup at a rim of the second cup, the retaining portion being connected to an inner wall of the second cup to form a smooth spherical surface for contacting a femoral head prosthesis.

15. An acetabular component, comprising: an acetabular outer cup and an acetabular inner liner;

16. A hip prosthesis, comprising:

the acetabular component of any one of claims 1-15; and