External cup and hip joint prosthesis having the same

Abstract

The present invention provides an outer cup and a hip joint prosthesis having the same. The outer cup comprises: an outer cup body having a first accommodating cavity and a first opening, the outer cup body being made of a metal material; a stop ring being arranged on the outer side wall of the outer cup body close to the first opening, the stop ring being made of a medical polyethylene material or a plastic material. The technical solution of the present invention can effectively solve the problem in the prior art that the outer cup and the inner liner of the hip joint prosthesis are easily wrapped by soft tissue.

Description

Technical Field

[0001] The present invention relates to the field of artificial prostheses, in particular to an outer cup and a hip joint prosthesis having the same. Background Art

[0002] Hip prosthesis replacement products include the more common combination of liner and outer cup locking, and the liner and ball head forming a joint surface, as well as dual-motion joint products. Dual-motion hip prosthesis includes two joint surfaces, one is the joint surface between the outer cup and the liner, and the other is the joint surface between the liner and the ball head. This combination is conducive to improving the mobility of the hip prosthesis, reducing the wear of the hip prosthesis, and thus extending the service life of the hip prosthesis.

[0003] The outer cup currently used in dual-motion hip prostheses on the market is similar in appearance to ordinary outer cups, and is divided into biological type and bone cement type. The inner surface of the outer cup is highly polished to reduce the wear between the outer cup and the inner lining. However, after the current outer cup is implanted in the patient's body, the patient's soft tissue is easily wrapped around the edge of the outer cup and the inner lining, which not only affects the range of motion of the hip prosthesis, but also causes pain to the patient. Summary of the invention

[0004] The main purpose of the present invention is to provide an outer cup and a hip joint prosthesis having the same, so as to solve the problem that the outer cup and the inner liner of the hip joint prosthesis in the prior art are easily wrapped by soft tissue.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an outer cup, comprising: an outer cup body, having a first accommodating cavity and a first opening, the outer cup body being made of a metal material; a stop ring, arranged on the outer wall of the outer cup body close to the first opening, the stop ring being made of a medical polyethylene material or a plastic material.

[0006] Furthermore, the medical polyethylene material may be an ultra-high molecular weight polyethylene material or a highly cross-linked polyethylene material, and the plastic material may be a solid medical silicone rubber material or a lipid-based thermoplastic polyurethane elastomer material.

[0007] Furthermore, the metal material may be a cobalt-chromium-molybdenum alloy or high-nitrogen stainless steel.

[0008] Furthermore, the stop ring is detachably arranged on the outer cup body.

[0009] Furthermore, a mounting ring groove is provided on the outer cup body, and the stop ring is inserted into the mounting ring groove.

[0010] Furthermore, a guide surface is provided on the mounting ring groove, the stop ring has a stop surface, and the guide surface is located on the circumferential outer side of the stop surface.

[0011] Furthermore, the mounting ring groove includes a guide groove section and a connecting groove section located outside the guide groove section, the groove wall close to the outer side of the guide groove section forms a guide surface, the stop ring includes a stop ring body and a mounting ring arranged on the inner circle of the stop ring body, the mounting ring includes a mating ring section adapted to the guide groove section and a connecting ring section mating with the connecting groove section, and the outer surface of the mating ring section forms a stop surface.

[0012] Furthermore, the longitudinal section of the mounting ring groove and the longitudinal section of the stop ring are T-shaped.

[0013] Furthermore, a first mounting notch passing through the mounting ring groove is provided on the outer cup body, and a second mounting notch corresponding to the first mounting notch is provided on the stop ring so that the stop ring is an open ring.

[0014] According to another aspect of the present invention, a hip joint prosthesis is provided, comprising: an outer cup, which is the outer cup described above; an inner liner, which is movably disposed in a first accommodating cavity of the outer cup, and has a second accommodating cavity; and a ball head, which is movably disposed in the second accommodating cavity.

[0015] By applying the technical solution of the present invention, a stop ring is provided on the outer wall of the outer cup body close to the first opening. The stop ring can stop the patient's soft tissue, thereby preventing the outer cup from being wrapped by the gradually growing soft tissue after installation, thereby making the hip joint prosthesis more mobile and preventing the patient from experiencing pain. Since the stop ring is made of polyethylene material or plastic material, the stop ring can be made into a suitable shape according to the contour of the soft tissue, thereby achieving a better stopping effect. In addition, the outer cup body is made of metal material, so that the outer cup has better wear resistance, thereby extending the service life of the hip joint prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of an outer cup according to the present invention is shown;

[0018] Figure 2 Shows Figure 1 A schematic diagram of the enlarged structure of the outer cup at A;

[0019] Figure 3 Shows Figure 1 a bottom view of an outer cup;

[0020] Figure 4 Shows Figure 3 A schematic cross-sectional structure diagram of the outer cup in the BB direction;

[0021] Figure 5 Shows Figure 4 A schematic diagram of the enlarged structure of the outer cup at C;

[0022] Figure 6 Shows Figure 1 A schematic diagram of the three-dimensional structure of the stop ring of the outer cup;

[0023] Figure 7 Shows Figure 6 An enlarged structural diagram of the stop ring at D;

[0024] Figure 8 Shows Figure 1 A schematic diagram of the three-dimensional structure when the stop ring of the outer cup is not connected to the outer cup body;

[0025] Fig. 9 Shows Figure 8 A schematic diagram of the enlarged structure of the outer cup at E;

[0026] Fig.10 Shows Figure 8 A schematic diagram of the longitudinal cross-sectional structure of the outer cup; and

[0027] Fig.11 Shows Fig.10 Schematic diagram of the enlarged structure at F of the outer cup.

[0028] The above drawings include the following reference numerals:

[0029] 1. First accommodating cavity; 2. First opening; 3. Mounting hole; 10. Outer cup body; 20. Stop ring; 21. Stop ring body; 22. Mounting ring; 221. Matching ring segment; 222. Connecting ring segment; 23. Stop surface; 30. Mounting ring groove; 31. Guide groove segment; 32. Connecting groove segment; 33. Guide surface; 40. First mounting notch; 50. Second mounting notch; 60. Wing plate; 70. Shell; 71. Second opening; 72. Side plate; 73. Front plate; 74. Rear plate; 75. Bottom plate; 76. Stop side plate; 80. Bracket; 81. Fitting surface; 90. Forming sleeve. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] like Figure 1 and Figure 3As shown, the outer cup of this embodiment includes: an outer cup body 10 and a stop ring 20. The outer cup body 10 has a first accommodating cavity 1 and a first opening 2, and the outer cup body 10 is made of metal material; the stop ring 20 is arranged on the outer side wall of the outer cup body 10 close to the first opening 2, and the stop ring 20 is made of medical polyethylene material or plastic material.

[0032] By applying the technical solution of this embodiment, a stop ring 20 is provided on the outer wall of the outer cup body 10 near the first opening 2. The stop ring 20 can stop the patient's soft tissue and prevent the soft tissue from continuing to grow into the gap between the outer cup and the inner lining, thereby making the hip joint prosthesis more mobile and preventing the patient from experiencing pain. Since the stop ring 20 is made of polyethylene material or plastic material, the stop ring 20 can be made into a suitable shape according to the contour of the soft tissue, thereby achieving a better stopping effect. In addition, the outer cup body 10 is made of metal material, so that the outer cup has better wear resistance, thereby extending the service life of the hip joint prosthesis.

[0033] like Figure 1 As shown, in this embodiment, the medical polyethylene material can be an ultra-high molecular weight polyethylene material or a highly cross-linked polyethylene material, and the plastic material can be a solid medical silicone rubber material or a lipid-based thermoplastic polyurethane elastomer material. In the above structure, the ultra-high molecular weight polyethylene material or the highly cross-linked polyethylene material can be trimmed into a suitable shape according to the contour of the patient's soft tissue. The solid medical silicone rubber material has high elasticity and is easy to shape. During the operation, it can be stretched to any extent at any position according to the soft tissue wrapping situation, and the operation is convenient. When the temperature of the lipid-based thermoplastic polyurethane elastomer material is raised to a preset temperature value, the shape remains unchanged at room temperature, so that the temperature of the lipid-based thermoplastic polyurethane elastomer material can reach a preset temperature during the operation, and after being stretched into a suitable shape according to the contour of the patient's soft tissue, it is restored to room temperature, and the shape of the lipid-based thermoplastic polyurethane elastomer material can be fixed. The above structure enables the stop ring 20 to have a better stopping effect on the patient's soft tissue.

[0034] like Figure 1 As shown, in this embodiment, the metal material can be cobalt-chromium-molybdenum alloy or high-nitrogen stainless steel. In the above structure, the cobalt-chromium-molybdenum alloy has good wear resistance and corrosion resistance, so that the wear resistance of the outer cup is better and the service life of the outer cup is improved. High-nitrogen stainless steel has good strength, ductility and corrosion resistance, so it is easy to process the outer cup body 10 and can also improve the service life of the outer cup.

[0035] like Figure 1 , Figure 6 and Figure 8As shown, in this embodiment, the stop ring 20 is detachably arranged on the outer cup body 10. In the above structure, when the stop ring 20 is damaged, the stop ring 20 can be removed from the outer cup body 10 for replacement, thereby avoiding the replacement of the entire hip joint prosthesis and saving the user's surgical costs.

[0036] like Figure 1 and Figure 2 As shown, in this embodiment, the outer cup body 10 is provided with a mounting ring groove 30, and the stop ring 20 is inserted into the mounting ring groove 30. The above structure is simple and is convenient for connecting the stop ring 20 to the outer cup body 10.

[0037] like Figure 1 , Figure 2 , Figure 5 and Figure 7 As shown, in this embodiment, a guide surface 33 is provided on the mounting ring groove 30, and the stop ring 20 has a stop surface 23, and the guide surface 33 is located on the circumferential outer side of the stop surface 23. In the above structure, when the stop ring 20 penetrates into the mounting ring groove 30, the guide surface 33 can stop the stop ring 20, so that the stop ring 20 can move forward along the mounting ring groove 30, and prevent the stop ring 20 from penetrating from the mounting ring groove 30 during the installation process. In addition, after the stop ring 20 penetrates into the mounting ring groove 30, the guide surface 33 is located on the circumferential outer side of the stop surface 23. When the stop ring 20 has a tendency to escape from the mounting ring groove 30, the guide surface 33 can stop the stop ring 20, thereby preventing the stop ring 20 from escaping from the mounting ring groove 30.

[0038] like Figure 1 , Figure 2 , Figure 5 and Figure 7As shown, in this embodiment, the mounting ring groove 30 includes a guide groove section 31 and a connecting groove section 32 located outside the guide groove section 31, and the groove wall close to the outside of the guide groove section 31 forms a guide surface 33. The stop ring 20 includes a stop ring body 21 and a mounting ring 22 arranged on the inner ring of the stop ring body 21. The mounting ring 22 includes a matching ring section 221 adapted to the guide groove section 31 and a connecting ring section 222 matched to the connecting groove section 32, and the outer surface of the matching ring section 221 forms a stop surface 23. In the above structure, the mounting ring 22 can extend into the mounting ring groove 30, and the stop ring body 21 can extend outward from the mounting ring groove 30 to the circumferential outer side of the first opening 2, thereby forming a stop for the soft tissue. Specifically, the matching ring section 221 of the mounting ring 22 can extend into the guide groove section 31 of the mounting ring groove 30, and the connecting ring section 222 of the mounting ring 22 can extend into the connecting groove section 32 of the mounting ring groove 30. The outer surface of the matching ring segment 221 forms a stop surface 23. When the stop ring 20 has a tendency to escape from the mounting ring groove 30, the stop surface 23 can be stopped by the guide surface 33, thereby preventing the stop ring 20 from escaping from the mounting ring groove 30. The above structure enables the stop ring 20 to be stably connected in the mounting ring groove 30.

[0039] like Figure 2 , Figures 4 to 7 As shown, in this embodiment, the longitudinal section of the mounting ring groove 30 and the longitudinal section of the stop ring 20 are T-shaped. In the above structure, the longitudinal section of the stop ring 20 is adapted to the longitudinal section of the mounting ring groove 30, so that the stop ring 20 is easy to penetrate into the mounting ring groove 30. In addition, the T-shaped longitudinal section makes the guiding effect of the guide surface 33 on the stop surface 23 better, so that the stop ring 20 can be stably connected in the mounting ring groove 30.

[0040] like Figures 1 to 3 , Figure 6 and Figure 7As shown, in this embodiment, the outer cup body 10 is provided with a first installation notch 40 passing through the mounting ring groove 30, and the stop ring 20 is provided with a second installation notch 50 corresponding to the first installation notch 40 so that the stop ring 20 is an open ring. In the above structure, the first installation notch 40 is provided to expose two opposite longitudinal sections of the mounting ring groove 30, and the second installation notch 50 corresponding to the first installation notch 40 is provided on the stop ring 20, so that the stop ring 20 has a first end and a second end. During installation, the T-shaped section of the first end of the stop ring 20 is opposite to the T-shaped section on one of the longitudinal sections of the mounting ring groove 30, and then an external force is applied to the stop ring 20 so that the first end of the stop ring 20 extends into the mounting ring groove 30. The external force is continuously applied to the stop ring 20 so that the first end of the stop ring 20 moves toward the longitudinal section of another mounting ring groove 30 until the first end of the stop ring 20 moves to the longitudinal section of the mounting ring groove 30. The above structure is simple, and the user encounters less resistance when installing the stop ring 20, so that the stop ring 20 can be quickly connected in the installation ring groove 30, thereby improving the assembly speed of the outer cup.

[0041] like Figure 1 , Figure 3 and Figure 8 As shown, the outer cup of this embodiment includes: an outer cup body 10 and a wing plate 60. The wing plate 60 is arranged on the outer side wall of the outer cup body 10, and the wing plate 60 includes a shell 70 and a bracket 80 arranged in the shell 70, the elastic modulus of the bracket 80 is smaller than the elastic modulus of the shell 70, and the wing plate 60 is provided with a mounting hole 3.

[0042] By applying the technical solution of this embodiment, since the elastic modulus of the bracket 80 is smaller than that of the shell 70, the bracket 80 is more likely to bend relative to the shell 70. Providing the bracket 80 in the wing plate 60 can reduce the specific gravity of the material with a large elastic modulus in the wing plate 60, making the wing plate 60 easier to bend as a whole, thereby making it easier for the wing plate 60 to fit the patient's bone, and further making the outer cup better fixed to the bone, thereby improving the stability of the hip joint prosthesis installed on the bone.

[0043] It should be noted that the above-mentioned "elastic modulus" refers to: stress under uniaxial stress state divided by strain in that direction. The elastic modulus can be regarded as an indicator of the ease with which a material can produce elastic deformation. The larger its value, the greater the stress required to cause a certain elastic deformation of the material, that is, the greater the stiffness of the material.

[0044] like Figure 8As shown, in this embodiment, the shell 70 is made of cobalt-chromium-molybdenum material or high-nitrogen stainless steel material, and the bracket 80 is made of plastic material. In the above structure, the cobalt-chromium-molybdenum alloy has good wear resistance and corrosion resistance, so that the wing plate is not easy to be damaged and has a longer service life. High-nitrogen stainless steel has good strength, ductility and corrosion resistance, which facilitates the processing of the outer cup body 10 and can also increase the service life of the outer cup. The elastic modulus of the plastic material is smaller, making the wing plate 60 easier to bend as a whole. The above structure can not only extend the service life of the wing plate 60, but also make the wing plate 60 easier to bend and have a better fixing effect, thereby delaying the renovation time, reducing the number of renovations, and reducing the patient's pain.

[0045] Since the wing plate 60 will form a contact surface with the patient's bone after being bent, if the hard shell 70 is in contact with the bone, it is difficult for the shell 70 to fit well with the bone, which is not conducive to the fusion of the outer cup body 10 with the patient's own bone, resulting in poor stability of the prosthesis after installation. Figure 8 , Fig. 9 and Fig.11 As shown, in this embodiment, the bracket 80 has a fitting surface 81 that fits with the bone, and the shell 70 is provided with a second opening 71 that avoids the fitting surface 81. In the above structure, after the wing plate 60 is bent, the fitting surface 81 of the bracket 80 can contact the bone surface of the patient. Since the bracket 80 is made of a plastic material, the fitting surface 81 is adapted to the contour of the patient's bone surface, which facilitates the patient's autologous bone to grow into the wing plate 60, so that the outer cup body 10 and the patient's own bone can be better integrated, so that the prosthesis has better stability in use.

[0046] like Figure 8 , Fig. 9 and Fig.11 As shown, in this embodiment, bone induction small molecules are arranged on the fitting surface 81. In the above structure, the patient's autologous bone can be extracted during or before the operation as an osteogenic material and added to the fitting surface 81 of the bracket 80. The osteoinductive molecules can transfer the osteogenic material to the bracket 80 and combine with the bracket 80, providing a living cell group for the bracket 80 to achieve fusion of the wing plate and the patient's autologous bone, further making the prosthesis have better stability in use.

[0047] like Figure 8 As shown, in this embodiment, the bracket 80 is inserted into the housing 70 through the second opening 71. The above structure is simple and is convenient for improving the assembly speed of the bracket 80 and the housing 70.

[0048] like Figure 8 , Fig. 9 and Fig.11As shown, in this embodiment, the housing 70 includes two side panels 72 arranged opposite to each other, a front panel 73 and a rear panel 74 arranged on both sides of the two side panels 72, a bottom panel 75 arranged below the side panels 72, the front panel 73 and the rear panel 74, and a stopper side panel 76 arranged at the upper edges of the two side panels 72 and the upper edge of the rear panel 74. The upper surface of the front panel 73 is lower than the upper surface of the side panels 72, and the mouth formed between the upper surface of the front panel 73 and the inner edge of the stopper side panel 76 forms a second opening 71. In the above structure, the bottom panel 75 and the stopper side panel 76 can limit the bracket 80 in the upper and lower placing direction, and the side panels 72, the front panel 73 and the rear panel 74 can surround the bracket 80 to form a limit position for the bracket 80. When the wing plate 60 is bent, the fitting surface 81 of the bracket 80 can fit the bone surface of the patient through the second opening 71, and the stopper side plate 76 can stop the bracket 80 to prevent the bracket 80 from falling out of the shell 70. The above structure enables the bracket 80 to be stably connected to the shell 70, so that the outer cup has better stability in use.

[0049] like Figure 8 , Fig. 9 and Fig.11 As shown, in this embodiment, the outer cup body 10 and the outer shell 70 are an integrally formed structure. The above structure can ensure the connection strength between the wing plate and the outer cup body 10, so that the wing plate is not easily damaged when bent. In addition, the outer cup body 10 and the outer shell 70 are made of the same material, both of which are made of cobalt-chromium-molybdenum material or high-nitrogen stainless steel material, so that the outer cup body 10 has better wear resistance and corrosion resistance.

[0050] The wing plate 60 needs to be provided with a mounting hole 3 for mounting a screw to fix it to the patient's autologous bone. Since the wing plate 60 includes a bracket made of plastic material, the mounting hole 3 in the bracket 80 is easily deformed when the wing plate is bent, making it difficult for the screw to penetrate the mounting hole 3, which brings inconvenience to the fixation of the outer cup body 10. In order to solve the above problem, as Figures 8 to 11 As shown, in this embodiment, the outer cup further includes: a shaping sleeve 90, which is inserted into the mounting hole 3 and has an interference fit with the mounting hole 3, and the elastic modulus of the shaping sleeve 90 is greater than the elastic modulus of the bracket 80. In the above structure, the shaping sleeve 90 is arranged in the mounting hole 3. Since the elastic modulus of the shaping sleeve 90 is greater than the elastic modulus of the bracket 80, the shaping sleeve 90 is not easily deformed when the wing plate 60 is bent. When the screw is connected, the screw is connected to the patient's autologous bone through the through hole in the shaping sleeve 90, so as to facilitate the fixation of the outer cup body 10.

[0051] like Fig.11As shown, in this embodiment, there are multiple mounting holes 3, and the shaping sleeves 90 are multiple and arranged one by one corresponding to the mounting holes 3; in the above structure, when the screw is connected, the outer cup body 10 is connected to the patient's autologous bone through the through hole in the shaping sleeve 90. The above structure is provided with multiple mounting holes 3 to increase the connection points between the outer cup body 10 and the autologous bone, so that the connection between the outer cup body 10 and the patient's autologous bone is more stable.

[0052] like Fig. 9 and Fig.11 As shown, in this embodiment, the shaped sleeve 90 is made of titanium alloy material, cobalt-chromium-molybdenum material or high-nitrogen stainless steel material. The above structure makes the shaped sleeve 90 have a larger elastic modulus, so that the shaped sleeve 90 is not easily deformed when the wing plate 60 is bent. In addition, the above material can also improve the wear resistance and corrosion resistance of the shaped sleeve 90, thereby extending the service life of the shaped sleeve 90, and then extending the service life of the outer cup as a whole.

[0053] The present application also provides a hip joint prosthesis, and an embodiment of the hip joint prosthesis of the present application includes: an outer cup, an inner liner and a ball head. Among them, the outer cup is the outer cup mentioned above; the inner liner can be movably arranged in the first accommodating cavity 1 of the outer cup, and the inner liner has a second accommodating cavity; the ball head can be movably arranged in the second accommodating cavity. In the above structure, the ball head can move in the second accommodating cavity of the inner liner, and the inner liner can move in the first accommodating cavity 1 of the outer cup, so that the flexibility of the hip joint prosthesis is better. Since the outer cup has the advantage of blocking the soft tissue from extending below the first opening 2, the hip joint prosthesis having it also has the above advantages. Since the outer cup can block the soft tissue from extending below the first opening 2, it can avoid the soft tissue from wrapping the gap between the outer cup and the inner liner, so that the hip joint prosthesis has better mobility and avoids pain for the patient.

[0054] In this embodiment, since the outer cup has the advantage that the wing plate is easy to bend, the hip joint prosthesis having the outer cup also has the above advantages.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An outer cup, characterized in that: include: An outer cup body (10) having a first accommodating cavity (1) and a first opening (2), wherein the outer cup body (10) is made of a metal material; A stop ring (20) is arranged on the outer wall of the outer cup body (10) close to the first opening (2), and the stop ring (20) is made of medical polyethylene material or plastic material; The outer cup body (10) is provided with a mounting ring groove (30), and the stop ring (20) is inserted into the mounting ring groove (30); The mounting ring groove (30) is provided with a guide surface (33), the stop ring (20) has a stop surface (23), and the guide surface (33) is located on the circumferential outer side of the stop surface (23); The mounting ring groove (30) comprises a guide groove section (31) and a connecting groove section (32) located outside the guide groove section (31); the groove wall of the guide groove section (31) close to the outside forms the guide surface (33); the stop ring (20) comprises a stop ring body (21) and a mounting ring (22) arranged on the inner ring of the stop ring body (21); the mounting ring (22) comprises a matching ring section (221) adapted to the guide groove section (31) and a connecting ring section (222) matched to the connecting groove section (32); the outer surface of the matching ring section (221) forms the stop surface (23); The outer cup body (10) is provided with a first mounting notch (40) passing through the mounting ring groove (30), and the stop ring (20) is provided with a second mounting notch (50) corresponding to the first mounting notch (40) so that the stop ring (20) is an open ring.

2. The outer cup according to claim 1, characterized in that: The medical polyethylene material is an ultra-high molecular weight polyethylene material or a highly cross-linked polyethylene material, and the plastic material is a solid medical silicone rubber material or a lipid-based thermoplastic polyurethane elastomer material.

3. The outer cup according to claim 1, characterized in that: The metal material is cobalt-chromium-molybdenum alloy or high-nitrogen stainless steel.

4. The outer cup according to claim 1, characterized in that: The stop ring (20) is detachably arranged on the outer cup body (10).

5. The outer cup according to claim 1, characterized in that: The longitudinal section of the mounting ring groove (30) and the longitudinal section of the stop ring (20) are T-shaped.

6. A hip joint prosthesis, comprising: The outer cup is characterized in that the outer cup is the outer cup according to any one of claims 1 to 5; An inner liner is movably arranged in the first receiving cavity (1) of the outer cup, and the inner liner has a second receiving cavity; The ball head is movably disposed in the second accommodating cavity.

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