A hip cup extractor

Abstract

The technical scheme discloses a hip joint cup extractor which is composed of a shell, a driving part and a screw rod. The shell is a hollow sphere, a first opening and a circular annular first sliding rail are arranged at the top of the shell, and three arc-shaped second sliding rails are uniformly distributed on the outer surface of the shell. The driving part is arranged in the shell, three third sliding rails are arranged on the outer wall of a sleeve with internal threads, the sleeve is slidably connected with the first sliding rail through a first connecting rod with a first sphere, and the sleeve can be rotated along with the sliding rail; a sliding block is arranged in the third sliding rail, an arc-shaped hard alloy blade which is attached to the shell is connected through a second connecting rod, the blade can be slid down to combine with a spherical surface and cut into bone. The sleeve is further connected with a fourth connecting rod with a second sphere through a hinged third connecting rod and a disc-shaped second fixing block, the second sphere can support the inner wall of the hip joint cup. The screw rod is screwed into the first opening and is in threaded engagement with the sleeve, an inclined surface block at the lower part of the screw rod can push the second fixing block to make the second sphere be opened and positioned, a conical rotating block at the bottom end of the screw rod can be engaged with a screw in the hip joint cup, and the screw can be screwed out and disassembled.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically, to an acetabular cup removal device. Background Technology

[0002] In orthopedic clinical treatment, total hip arthroplasty is an effective means of treating end-stage hip joint diseases (such as avascular necrosis of the femoral head, femoral neck fracture, and severe hip arthritis), which can significantly relieve patient pain, restore hip joint function, and improve patients' quality of life. With the increasing number of total hip arthroplasty surgeries each year, the number of cases requiring hip revision surgery due to prosthesis loosening, joint instability, infection, prosthesis wear, etc., is also increasing. The removal of the acetabular cup prosthesis is one of the most challenging core steps in hip revision surgery, and its operational difficulty directly affects surgical efficiency, treatment effect, and the patient's postoperative recovery process.

[0003] Hip revision surgery, due to its complex anatomy, varied bone defects, and tight integration of the prosthesis with bone or bone cement, has long been considered a highly challenging procedure in joint surgery. The removal of the acetabular cup is particularly difficult. In clinical practice, manual removal of acetabular cups that are cemented or have undergone strong ingrowth into the bone requires a high level of surgical skill and considerable physical strength. This not only consumes a significant amount of surgical time but also easily leads to a series of complications, such as acetabular bed injury, additional bone loss, damage to surrounding blood vessels and nerves, and even life-threatening risks like pelvic fractures, severely impacting surgical safety and the patient's postoperative recovery period.

[0004] To address the challenge of acetabular cup removal, various types of acetabular cup removers have emerged in the current technology. However, these removers still have many shortcomings and are difficult to meet actual clinical needs. Some existing removers are modified from general instruments such as bone chisels and prying tools. Their shape does not fit the acetabular cup well, and they are prone to slipping during operation. This not only increases the difficulty of operation but also causes excessive bone cutting, further aggravating bone defects and hindering subsequent acetabular reconstruction.

[0005] Therefore, developing an acetabular cup extractor that can be adapted to various sizes of acetabular cups, is easy to operate, is precise and controllable, can maximize the protection of the acetabular bone bed and surrounding tissues, reduce surgical risks, and improve surgical efficiency has become an urgent technical problem to be solved in the field of orthopedic medical devices. Summary of the Invention

[0006] The main objective of this invention is to provide an acetabular cup remover to solve the problems of inaccurate fitting and excessive bone removal during acetabular cup removal.

[0007] To achieve the above objectives, the present invention provides an acetabular cup extractor, specifically comprising: a housing, a driving unit, and a screw. The housing has a first opening at its top, a first slide rail on its inner surface, and three second slide rails evenly distributed on its outer surface. The driving unit is disposed inside the housing and includes a sleeve. The sleeve has a first thread on its inner surface and three third slide rails evenly distributed on its outer surface. Three first connecting rods are evenly distributed on the sleeve, each first connecting rod having a corresponding first ball. A sliding block is correspondingly disposed within each of the third slide rails, and a cylindrical second connecting rod is connected to each sliding block. A blade is correspondingly connected to each second connecting rod. Three first fixing blocks are also evenly distributed on the sleeve. The screw passes through the first opening and is screwed into the housing. The screw has a second thread on its surface, which meshes with the first thread inside the sleeve.

[0008] Furthermore, the diameter of the first opening matches the diameter of the screw, the screw can pass through the first opening, the first slide rail has a circular cross-section, the first ball is disposed in the first slide rail and can slide to drive the sleeve to rotate, and the second connecting rod can pass through the second slide rail and move up and down in the second slide rail to drive the blade to move up and down.

[0009] Furthermore, the sleeve is connected to the first slide rail inside the outer shell via the first connecting rod and can rotate. The third slide rail is evenly arranged on the outer surface of the sleeve, and its direction is consistent with that of the second slide rail, thereby enabling the second connecting rod to slide when the sliding block slides.

[0010] Furthermore, the head of the sliding block is arc-shaped, the sliding block can slide within the third slide rail, the blade is arc-shaped and fits against the outer surface of the outer shell, the blade can be assembled into a spherical surface after sliding downwards, and the blade is made of hard alloy material that can be inserted into bone.

[0011] Furthermore, the first fixing block is provided with an arc-shaped second opening, and a third connecting rod is hinged to the second opening, so the third connecting rod can rotate. A second fixing block is connected to the third connecting rod. The second fixing block is disc-shaped, and a fourth connecting rod is obliquely connected to the second fixing block. The fourth connecting rod is connected to a second ball, which can contact the inner wall of the acetabular cup and form support. At the same time, in order to adapt to the size of the inner wall of the acetabular cup, the included angle between the second fixing block and the fourth connecting rod can be adjusted accordingly.

[0012] Furthermore, the lower part of the screw is provided with an inclined block, which is a trapezoidal frustum that can contact the second fixing block and push it outward, thereby driving the fourth connecting rod to open outward, so that the second ball contacts the inner wall of the acetabular cup.

[0013] Furthermore, a cylindrical third fixing block is symmetrically arranged at the top of the screw, and a conical rotating block is arranged at the bottom of the screw. The rotating block can engage with the screw in the acetabular cup, thereby enabling the screw to be screwed out of the bone.

[0014] According to the technical solution of this invention, an acetabular cup extractor includes a shell, a driving unit, and a screw. The shell is a hollow sphere, with a circular first opening at its top. A first slide rail, which is an annular groove with a circular cross-section, is provided on the inner surface of the top of the shell. Three second slide rails, which are arc-shaped, are evenly distributed on the outer surface of the shell. The driving unit is disposed inside the shell and includes a sleeve. The inner surface of the sleeve has a first thread, and the outer surface of the sleeve has three third slide rails evenly distributed. Three first connecting rods are evenly distributed on the sleeve, and a first sphere is correspondingly disposed on each of the first connecting rods. The first spheres can be mounted on the... The sleeve rotates by sliding within a first slide rail on the inner surface of the outer casing. A sliding block with an arc-shaped head is correspondingly provided within a third slide rail on the outer surface of the sleeve. The sliding block can slide within the third slide rail. A cylindrical second connecting rod is correspondingly connected to the sliding block. The second connecting rod passes through the second slide rail on the outer surface of the outer casing and can slide within it. A blade is correspondingly connected to the second connecting rod. The blade is arc-shaped and fits against the outer surface of the outer casing. After sliding downwards, the blade can be assembled into a spherical shape. The blade is made of hard alloy material and can be inserted into bone. In the sleeve, three first fixing blocks are evenly arranged. Each first fixing block has an arc-shaped second opening. A third connecting rod is hinged to the second opening, allowing the third connecting rod to rotate. A second fixing block, which is disc-shaped, is connected to the third connecting rod. A fourth connecting rod is obliquely connected to the second fixing block. The fourth connecting rod is connected to a second ball, which can contact the inner wall of the acetabular cup and provide support. To accommodate different sizes of acetabular cups, the angle between the second fixing block and the fourth connecting rod can be adjusted accordingly. The rod passes through the first opening and screws into the housing. A cylindrical third fixing block is symmetrically arranged on the top of the screw. A second thread is provided on the surface of the screw, which meshes with the first thread inside the sleeve. An inclined block is provided at the bottom of the screw. The inclined block is a trapezoidal frustum. The inclined block can contact the second fixing block and push it outward, thereby driving the fourth connecting rod to open outward, so that the second ball contacts the inner wall of the acetabular cup. A conical rotating block is provided at the bottom of the screw. The rotating block can mesh with the screw inside the acetabular cup, thereby enabling the screw to be screwed out of the bone.

[0015] Therefore, the technical solution of this application uses a screw to screw the blade on the outer surface of the outer shell into the bone outside the acetabular cup while unscrewing the screw inside the acetabular cup, and at the same time supports the inner surface of the acetabular cup, thereby achieving non-destructive removal of the acetabular cup. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A schematic diagram of the acetabular cup removal device is shown. Figure 2 A schematic diagram of the drive unit and screw is shown. Figure 3 A schematic diagram of the overall drive unit is shown; Figure 4 A schematic diagram of the sliding block is shown; Figure 5 A schematic diagram of the screw is shown. Figure 6 A schematic diagram of the overall casing is shown; The above-mentioned figures include the following reference numerals: 1. Outer shell; 10. First opening; 11. First slide rail; 12. Second slide rail; 2. Drive unit; 20. Sleeve; 200. First thread; 201. Third slide rail; 21. First connecting rod; 210. First ball; 22. Sliding block; 220. Second connecting rod; 221. Blade; 23. First fixing block; 230. Second opening; 231. Third connecting rod; 232. Second fixing block; 233. Fourth connecting rod; 234. Second ball; 3. Screw; 30. Third fixing block; 31. Second thread; 32. Inclined block; 33. Rotating block. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0020] like Figure 1-6As shown: A acetabular cup extractor includes a housing 1, a driving unit 2, and a screw 3. The housing 1 is a hollow sphere with a circular first opening 10 at its top. A first slide rail 11, which is an annular groove with a circular cross-section, is provided on the inner surface of the top of the housing 1. Three second slide rails 12, which are arc-shaped openings, are evenly arranged on the outer surface of the housing 1. The driving unit 2 is disposed inside the housing 1 and includes a sleeve 20 with a first thread 200 on its inner surface and three third slide rails 201 evenly arranged on its outer surface. The sleeve 20 is evenly provided with three first connecting rods 21, and a first ball 210 is correspondingly provided on the first connecting rod 21. The first ball 210 can be disposed in the first slide rail 11 on the inner surface of the outer shell 1 and slide to drive the sleeve 20 to rotate. A sliding block 22 is correspondingly provided in the third slide rail 201 on the outer surface of the sleeve 20. The head of the sliding block 22 is arc-shaped. The sliding block 22 can slide in the third slide rail 201. A cylindrical second connecting rod 220 is correspondingly connected to the sliding block 22. The rod 220 can pass through the second slide rail 12 on the outer surface of the outer shell 1 and slide within the second slide rail 12. A blade 221 is correspondingly connected to the second connecting rod 220. The blade 221 is arc-shaped and fits against the outer surface of the outer shell 1. After sliding downwards, the blade 221 can be assembled into a hemispherical surface. The blade 221 is made of hard alloy material and can be inserted into bone. Three first fixing blocks 23 are also evenly arranged on the sleeve 20. Each first fixing block 23 has an arc-shaped second opening 230, within which a corresponding hinge... The chain is connected to a third connecting rod 231, so the third connecting rod 231 can rotate. A second fixing block 232 is connected to the third connecting rod 231. The second fixing block 232 is disc-shaped. A fourth connecting rod 233 is obliquely connected to the second fixing block 232. The fourth connecting rod 233 is connected to a second ball 234. The second ball 234 can contact the inner wall of the acetabular cup and form a support. At the same time, in order to adapt to the inner wall size of different acetabular cups, the included angle between the second fixing block 232 and the fourth connecting rod 233 can be adjusted accordingly.The screw 3 passes through the first opening 10 and screws into the housing 1. A cylindrical third fixing block 30 is symmetrically arranged at the top of the screw 3. A second thread 31 is provided on the surface of the screw 3, which meshes with the first thread 200 inside the sleeve 20. A sloping block 32, which is a trapezoidal frustum, is provided at the lower part of the screw 3. The sloping block 32 can contact the second fixing block 232 and push it outward, thereby causing the fourth connecting rod 233 to expand outward, so that the second ball 234 contacts the inner wall of the acetabular cup. A conical rotating block 33 is provided at the bottom of the screw 3. The rotating block 33 can mesh with the screw to be removed from the acetabular cup, thereby allowing the screw to be unscrewed from the bone.

[0021] like Figure 1 As shown: An acetabular cup remover includes a housing 1, which is a hollow sphere. Three second slide rails 12 are evenly arranged on the outer surface of the housing 1, and the second slide rails 12 are arc-shaped openings. The blade 221 is arc-shaped and fits against the outer surface of the housing 1. The blade 221 can be assembled into a spherical surface after sliding downward. A fourth connecting rod 233 is connected to a second sphere 234, which can contact the inner wall of the acetabular cup and form a support. A screw 3 is screwed into the housing 1. A cylindrical third fixing block 30 is symmetrically arranged at the top of the screw 3. A second thread 31 is provided on the surface of the screw 3. An inclined block 32 is provided at the bottom of the screw 3. The inclined block 32 is a trapezoidal frustum. A conical rotating block 33 is provided at the bottom of the screw 3. The rotating block 33 can engage with the screw to be removed from the acetabular cup, thereby enabling the screw to be unscrewed from the bone.

[0022] like Figure 2As shown: Three third slide rails 201 are evenly arranged on the outer surface of the sleeve 20. Three first connecting rods 21 are evenly arranged on the upper part of the sleeve 20. The first connecting rods 21 are correspondingly connected to the first spheres 210. Sliding blocks are correspondingly arranged inside the third slide rails 201. Second connecting rods 220 are correspondingly connected to the sliding blocks. Blades 221 are correspondingly connected to the second connecting rods 220. The blades 221 are arc-shaped and fit against the outer surface of the outer shell 1. After sliding downward, the blades 221 can be assembled into a spherical surface. Three first fixing blocks 23 are also evenly arranged on the sleeve 20. The first fixing blocks 23 are correspondingly connected to the third connecting rods 231. The third connecting rods 231 can rotate. Second fixing blocks 232 are connected to the third connecting rods 231. Block 232 is disc-shaped. The second fixing block 232 is obliquely connected to the fourth connecting rod 233, and the fourth connecting rod 233 is connected to the second ball 234. The screw 3 is screwed into the sleeve 20. The top of the screw 3 is symmetrically provided with a cylindrical third fixing block 30. The surface of the screw 3 is provided with a second thread 31. The lower part of the screw 3 is provided with an inclined block 32. The inclined block 32 is a trapezoidal frustum. The inclined block 32 can contact the second fixing block 232 and push it outward, thereby driving the fourth connecting rod 233 to open outward, so that the second ball 234 contacts the inner wall of the acetabular cup. The bottom of the screw 3 is provided with a conical rotating block 33. The rotating block 33 can engage with the screw to be removed from the acetabular cup, thereby enabling the screw to be unscrewed from the bone.

[0023] like Figure 3As shown: The driving unit 2 includes a sleeve 20. The inner surface of the sleeve 20 is provided with a first thread 200. Three third slide rails 201 are evenly arranged on the outer surface of the sleeve 20. Three first connecting rods 21 are evenly arranged on the sleeve 20. A first ball 210 is correspondingly arranged on each of the first connecting rods 21. A sliding block 22 is correspondingly arranged inside the third slide rails 201 on the outer surface of the sleeve 20. The sliding block 22 can slide within the third slide rails 201. A cylindrical second connecting rod 220 is correspondingly connected to the sliding block 22. A blade 221 is correspondingly connected to the second connecting rod 220. The blade 221 is arc-shaped and fits against the outer surface of the outer shell 1. After sliding downwards, the blade 221 can be assembled into a spherical surface. The blade 221 is... The hard alloy material can be inserted into the bone; the sleeve 20 is also evenly provided with three first fixing blocks 23, each first fixing block 23 having an arc-shaped second opening 230, and a third connecting rod 231 is hinged to the second opening 230, so the third connecting rod 231 can rotate. The third connecting rod 231 is connected to a second fixing block 232, which is disc-shaped. The second fixing block 232 is obliquely connected to a fourth connecting rod 233, and the fourth connecting rod 233 is connected to a second ball 234. The second ball 234 can contact the inner wall of the acetabular cup and form support. At the same time, in order to adapt to the inner wall size of different acetabular cup sizes, the included angle between the second fixing block 232 and the fourth connecting rod 233 can be adjusted accordingly.

[0024] like Figure 4 As shown: The head of the sliding block 22 is arc-shaped, and a cylindrical second connecting rod 220 is correspondingly connected to the sliding block 22. A blade 221 is correspondingly connected to the second connecting rod 220. The blade 221 is arc-shaped and fits against the outer surface of the outer shell. After the blade 221 slides down, it can be assembled into a spherical surface. The blade 221 is made of hard alloy material and can be inserted into bone.

[0025] like Figure 5 As shown: a cylindrical third fixing block 30 is symmetrically arranged at the top of the screw 3, a second thread 31 is provided on the surface of the screw 3, an inclined block 32 is provided at the lower part of the screw 3, the inclined block 32 is a trapezoidal frustum, and a conical rotating block 33 is provided at the bottom of the screw 3. The rotating block 33 can engage with the screw to be removed from the acetabular cup, thereby enabling the screw to be unscrewed from the bone.

[0026] like Figure 6As shown: the outer shell 1 is a hollow sphere, the top of the outer shell 1 is provided with a circular first opening 10, the inner surface of the top of the outer shell 1 is provided with a first slide rail 11, the first slide rail 11 is a circular groove, the cross section of the first slide rail 11 is circular, and the outer surface of the outer shell 1 is evenly provided with three second slide rails 12, the second slide rails 12 are arc-shaped openings.

[0027] When using this invention, the specific technical effects brought about by the embodiments are as follows: When acetabular repair surgery is required and the acetabular cup needs to be removed, after removing the acetabular liner, the acetabular cup is removed using this invention. First, the lower part of the outer shell is aligned with the edge of the acetabular cup to achieve positional calibration. Then, the screw is lowered so that the rotating part at the bottom of the screw is aligned with the screw on the acetabular cup. Next, the screw is rotated so that the screw can be screwed out of the bone. While the screw is rotating, the screw moves upward, and the inclined block on the screw moves upward accordingly. The upward-moving inclined block can push the disc-shaped second fixing block outward. The outward-moving second fixing block can drive the fourth connecting rod and the second ball to be pushed open and move towards the inner wall of the acetabular cup. At the same time, in order to adapt to the inner wall size of different acetabular cup sizes, the included angle between the second fixing block and the fourth connecting rod can be adjusted accordingly. At the same time, when the screw rotates upward, it can drive the meshing sleeve to rotate. Since the first connecting rod on the sleeve is connected to the first slide rail of the outer shell through the first ball, the sleeve rotates... The movement is restricted up and down. When the sleeve rotates, the sliding block in the third slide rail on the outer surface of the sleeve slides accordingly. The sliding block moves downward with the trend of the third slide rail, which at the same time drives the second connecting rod in the second slide rail on the outer surface of the outer shell to move downward. The movement of the second connecting rod will also drive the blade downward. The downward-moving blade will slowly screw into the bone on the outer surface of the acetabular cup and wrap around the acetabular cup. When the screw completely unscrews the screw fixing the acetabular cup, the inclined block at the bottom of the screw will also push the second fixing block to the outermost side. The fourth connecting rod and the second ball are also fully opened and supported on the inner wall of the acetabular cup. The sliding block also slides to the bottom of the third slide rail, which in turn drives the second connecting rod to slide to the bottom of the second slide rail on the outer surface of the outer shell. This allows the blade to be completely pushed into the bone on the outer surface of the acetabular cup. The blade is fully extended to form a hemisphere and wraps around the outer surface of the acetabular cup to be removed. Then the acetabular cup is removed from the acetabular fossa, while avoiding the removal of bone.

[0028] In summary, this invention, by designing an acetabular cup extractor, solves the problems of inaccurate fitting and excessive bone removal during acetabular cup extraction, while also greatly enhancing the stability of the tool during extraction to prevent fractures.

[0029] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0030] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A acetabular cup removal device, characterized in that, include: The outer shell (1) has a first opening (10) on its top, a first slide rail (11) on its inner surface, and three second slide rails (12) evenly arranged on its outer surface. A drive unit (2) is disposed inside the outer casing (1). The drive unit (2) includes a sleeve (20). The inner surface of the sleeve (20) is provided with a first thread (200). Three third slide rails (201) are evenly disposed on the outer surface of the sleeve (20). The direction of the third slide rails (201) is consistent with the direction of the second slide rails (12). Three first connecting rods (21) are evenly disposed on the sleeve (20). The first connecting rods (21) are corresponding to... A first sphere (210) is provided, and a sliding block (22) is correspondingly provided in the third slide rail (201). The sliding block (22) is correspondingly connected to a second connecting rod (220), and the second connecting rod (220) is correspondingly connected to a blade (221). The blade (221) is set in an arc shape and fits against the outer surface of the outer shell (1). After the blade (221) slides down, it can be assembled into a spherical surface. Three first fixing blocks (23) are also evenly provided on the sleeve (20). The screw (3) passes through the first opening (10) and is screwed into the housing (1). The surface of the screw (3) is provided with a second thread (31), which meshes with the first thread (200).

2. The acetabular cup extractor according to claim 1, characterized in that, The diameter of the first opening (10) matches the diameter of the screw (3), the cross section of the first slide rail (11) is circular, the first ball (210) is set in the first slide rail (11) and can slide, and the second connecting rod (220) can pass through the second slide rail (12) and move up and down in the second slide rail (12).

3. The acetabular cup extractor according to claim 1, characterized in that, The sleeve (20) is connected to the first slide rail (11) inside the outer casing (1) via the first connecting rod (21) and can rotate.

4. The acetabular cup extractor according to claim 1, characterized in that, The head of the sliding block (22) is arc-shaped, and the sliding block (22) can slide within the third slide rail (201).

5. The acetabular cup extractor according to claim 1, characterized in that, The first fixing block (23) is provided with an arc-shaped second opening (230), and a third connecting rod (231) is connected to the second opening (230) via a hinge. A second fixing block (232) is connected to the third connecting rod (231). The second fixing block (232) is disc-shaped, and a fourth connecting rod (233) is obliquely connected to the second fixing block (232). The fourth connecting rod (233) is connected to a second sphere (234).

6. The acetabular cup extractor according to claim 5, characterized in that, The lower part of the screw (3) is provided with a sloping block (32), which is a trapezoidal frustum that can contact the second fixing block (232) and push it outward.

7. The acetabular cup extractor according to claim 1, characterized in that, The top of the screw (3) is symmetrically provided with a cylindrical third fixing block (30), and the bottom of the screw (3) is provided with a conical rotating block (33).

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