CN113827376B

CN113827376B - Acetabular prosthesis

Info

Publication number: CN113827376B
Application number: CN202111389957.6A
Authority: CN
Inventors: 刘敏
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-04-19
Anticipated expiration: 2041-11-23
Also published as: CN113827376A

Abstract

The invention provides an acetabular prosthesis comprising: a cup body; the adapter cylinder is movably arranged in the cup body, and a mounting hole is formed in the adapter cylinder; the limiting structure is arranged between the cup body and the adapter cylinder; the ball head assembly is rotatably arranged in the mounting hole; wherein, an included angle is formed between the axis of the adapter cylinder and the axis of the mounting hole. The technical scheme of this application has solved the unable problem of adjusting of the eccentricity of acetabular bone prosthesis among the correlation technique effectively.

Description

Acetabular prosthesis

Technical Field

The invention relates to the technical field of medical instruments, in particular to an acetabular prosthesis.

Background

Total hip replacement is a mature operation at present, solves the disease symptoms of hip joint disease patients and improves the lives of the patients. The total hip joint replacement prosthesis comprises an acetabulum side prosthesis and a femur side prosthesis, and the common acetabulum side prosthesis comprises an acetabulum cup, a lining and a ball head. The existing double-acting total hip product has the advantages of good mobility and reduction of dislocation rate due to the large-diameter joint surface, and is concerned by people, besides the traditional double-acting outer cup, the double-acting inner liner and the ball head, the new double-acting acetabular product comprises a metal acetabular outer cup, a metal acetabular inner liner, a plastic large-diameter double acting head and a ball head.

In the related art, there are various designs of metal acetabular liners, including a common type similar to the ceramic liner, a separation-proof type, and a rotation-proof type, but the eccentric distances of the various products cannot be adjusted, which results in that the acetabular prosthesis cannot be applied to different patients.

Disclosure of Invention

The invention mainly aims to provide an acetabular prosthesis, which aims to solve the problem that the eccentricity of the acetabular prosthesis in the related art cannot be adjusted.

In order to achieve the above object, the present invention provides an acetabular prosthesis including: a cup body; the adapter cylinder is movably arranged in the cup body, and a mounting hole is formed in the adapter cylinder; the limiting structure is arranged between the cup body and the adapter cylinder; the ball head assembly is rotatably arranged in the mounting hole; wherein, an included angle is formed between the axis of the adapter cylinder and the axis of the mounting hole.

Further, a switching section of thick bamboo includes outer barrel and interior barrel, and interior barrel is installed in the urceolus, is provided with locking structure between outer barrel and the interior barrel, and the mounting hole is located the inside of interior barrel.

Further, the acetabulum prosthesis further comprises a rotation stopping structure, and the rotation stopping structure is arranged between the cup body and the outer cylinder body.

Furthermore, the inner wall of the outer barrel is provided with a spiral groove, the outer wall of the inner barrel is provided with a spiral protrusion, and the spiral protrusion is positioned in the spiral groove and can be rotationally arranged.

Further, locking structure includes first locking piece, and first locking piece includes the pin, is provided with the through-hole on the outer barrel, and the pin interference ground inserts in the through-hole and with the protruding butt cooperation of spiral.

Further, the pin includes a plurality ofly, and the through-hole includes a plurality ofly that the axial interval along outer barrel set up, and a plurality of pins and a plurality of through-hole one-to-one set up, through-hole and helicla flute interval set up.

Further, the locking structure still includes the second locking piece, and the second locking piece includes the bolt, is provided with the first screw hole of the axial extension of barrel in following on the spiral arch, is provided with the second screw hole of the axial extension of outer barrel along on the inside wall of outer barrel, and first screw hole and second screw hole set up with one heart, and the bolt is installed in first screw hole and second screw hole.

Further, limit structure includes projection and mounting groove, and the projection is installed in the mounting groove, and one of projection and mounting groove sets up on the outer wall of outer barrel, and another of projection and mounting groove sets up in the inner wall of cup.

Further, the mounting groove includes axial slot and circumference groove, and axial slot and circumference groove intercommunication, the projection enters into the circumference inslot by the axial slot, and the mobilizable setting of projection in the width direction of circumference groove.

Further, the rotation stopping structure comprises a plurality of convex blocks arranged on the end portion of the outer barrel at intervals and a plurality of concave portions arranged on the end portion of the cup body at intervals, the concave portions and the convex blocks are arranged in a one-to-one correspondence mode, the convex blocks are installed in the concave portions, when the convex columns are located in the axial grooves, the convex blocks and the concave portions are arranged in a staggered mode, the convex blocks and the concave portions are arranged in a corresponding mode when the convex columns move along the circumferential grooves, and the convex columns move in the width direction of the circumferential grooves when the convex blocks enter the concave portions.

Further, the ball head component comprises an acetabulum lining, a double acting head and a ball head, the double acting head is arranged in the acetabulum lining, the ball head is arranged in the double acting head, the acetabulum lining is arranged in the adapter sleeve, a supporting convex part is arranged on the side wall of the acetabulum lining, and the supporting convex part is in butt fit with the adapter sleeve.

By applying the technical scheme of the invention, the adapter cylinder is movably arranged inside the cup body, and the adapter cylinder is internally provided with the mounting hole. The ball head assembly is disposed in the mounting hole. The limiting structure is arranged between the cup body and the adapter cylinder. And an included angle is formed between the axis of the adapter cylinder and the axis of the mounting hole. Through foretell setting, the mounting hole of the inside of a switching section of thick bamboo is an inclined to one side hole, simultaneously because a switching section of thick bamboo is movable, the position of a switching section of thick bamboo can be adjusted promptly, when implanting the acetabular prosthesis through foretell setting, can adjust the position of a switching section of thick bamboo according to patient's actual conditions, and fix the position of a switching section of thick bamboo through limit structure, guaranteed the position of a switching section of thick bamboo and the ball head subassembly that is located a switching section of thick bamboo like this, and then make the adaptation patient that overall structure can be better. The eccentric distance of the acetabulum prosthesis can be effectively adjusted through the adapter tube, so that excessive ligament or muscle pulling can be effectively avoided, and excessive relaxation of the ligament or the muscle can also be avoided. Therefore, the technical scheme of the application effectively solves the problem that the eccentricity of the acetabular prosthesis in the related art cannot be adjusted.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

figure 1 shows an exploded schematic view of an embodiment of an acetabular prosthesis according to the invention;

FIG. 2 illustrates a perspective view of the acetabular prosthesis of FIG. 1;

FIG. 3 shows a cross-sectional schematic view of the acetabular prosthesis of FIG. 2;

FIG. 4 shows an enlarged partial view of the acetabular prosthesis of FIG. 3 at A;

FIG. 5 illustrates an exploded schematic view of an adapter sleeve of the acetabular prosthesis of FIG. 1;

FIG. 6 shows a schematic cross-sectional view of the adapter cartridge of FIG. 5;

fig. 7 shows a schematic perspective view of the outer cylinder of the adapter cylinder of fig. 5;

fig. 8 shows a schematic perspective view of the inner cylinder of the adapter cylinder of fig. 5;

FIG. 9 shows a cross-sectional schematic view of the inner barrel of FIG. 8;

fig. 10 shows a perspective view of a partial structure of the acetabular prosthesis of fig. 1.

Wherein the figures include the following reference numerals:

10. a cup body; 20. a transfer cylinder; 21. mounting holes; 22. an outer cylinder; 221. a helical groove; 222. a through hole; 223. a second threaded hole; 23. an inner cylinder; 231. a spiral protrusion; 232. a first threaded hole; 30. a limiting structure; 31. a convex column; 32. mounting grooves; 321. an axial slot; 322. a circumferential groove; 40. a ball head assembly; 41. an acetabular liner; 411. a support protrusion; 42. a double moving head; 43. a ball head; 50. a locking structure; 51. a first locking member; 511. a pin; 52. a second locking member; 521. a bolt; 60. a rotation stopping structure; 61. a bump; 62. a recess.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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 invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in fig. 1 to 3 and 10, in the present embodiment, the acetabular prosthesis includes: cup 10, adapter 20, limit structure 30 and ball head subassembly 40. The adapter 20 is movably arranged in the cup body 10, and a mounting hole 21 is arranged in the adapter 20. The limiting structure 30 is arranged between the cup body 10 and the adapter 20. The ball element assembly 40 is rotatably disposed in the mounting hole 21. Wherein, an included angle is formed between the axis of the adapter cylinder 20 and the axis of the mounting hole 21.

By applying the technical scheme of the embodiment, the adapter 20 is movably arranged inside the cup body 10, and the mounting hole 21 is arranged inside the adapter 20. The ball element assembly 40 is disposed in the mounting hole 21. The limiting structure 30 is arranged between the cup body 10 and the adapter 20. And an included angle is formed between the axis of the adapter cylinder 20 and the axis of the mounting hole 21. Through the above arrangement, the mounting hole 21 in the adapter cylinder 20 is an inclined hole, and meanwhile, the adapter cylinder 20 is movable, that is, the position of the adapter cylinder 20 can be adjusted, when the acetabular prosthesis is implanted through the arrangement, the position of the adapter cylinder 20 can be adjusted according to the actual condition of a patient, and the position of the adapter cylinder 20 is fixed through the limiting structure 30, so that the positions of the adapter cylinder 20 and the ball head assembly 40 located in the adapter cylinder 20 are ensured, and the whole structure can be better adapted to the patient. The eccentricity of the acetabular prosthesis can be effectively adjusted through the adapter 20, so that excessive ligament or muscle pulling can be effectively avoided, and excessive relaxation of the ligament or muscle can also be avoided. Therefore, the technical scheme of the embodiment effectively solves the problem that the eccentricity of the acetabular prosthesis in the related art cannot be adjusted.

As shown in fig. 1 to 10, in the present embodiment, the adapter 20 includes an outer cylinder 22 and an inner cylinder 23, the inner cylinder 23 is installed in the outer cylinder 22, a locking structure 50 is disposed between the outer cylinder 22 and the inner cylinder 23, and the installation hole 21 is located inside the inner cylinder 23. The outer cylinder 22 and the inner cylinder 23 are simple in structure and convenient to arrange, and the arrangement can effectively improve the structural strength of the body of the adapter cylinder 20. Also, the locking structure 50 can effectively lock the positions of the outer cylinder 22 and the inner cylinder 23. Specifically in this embodiment, the inner cylinder 23 is fully installed within the outer cylinder 22 and locked by the locking structure 50. Of course, the inner cylinder 23 can also be partially located in the outer cylinder 22 and locked by the locking structure 50. This effectively improves the versatility of the adapter 20.

As shown in fig. 1 to 10, in the present embodiment, the acetabular prosthesis further includes a rotation stopping structure 60, and the rotation stopping structure 60 is disposed between the cup body 10 and the outer cylinder 22. The rotation stopping structure 60 can prevent the cup body 10 and the outer cylinder 22 from rotating, so as to effectively limit the position of the adapter cylinder 20 and ensure the implanted effect.

As shown in fig. 1 to 10, in the present embodiment, a spiral groove 221 is provided on an inner wall of the outer cylinder 22, and a spiral protrusion 231 is provided on an outer wall of the inner cylinder 23, and the spiral protrusion 231 is located in the spiral groove 221 and rotatably provided. The helical protrusion 231 and the helical groove 221 are in helical engagement, which facilitates adjustment of the relative position between the outer cylinder 22 and the inner cylinder 23, on the one hand, and enables more precise adjustment, on the other hand. Meanwhile, the spiral protrusion 231 and the spiral groove 221 are simple in structure and convenient to arrange.

As shown in fig. 5, 7 and 8, in the present embodiment, the locking structure 50 includes a first locking member 51, the first locking member 51 includes a pin 511, a through hole 222 is provided on the outer cylinder 22, and the pin 511 is inserted into the through hole 222 in an interference manner and is in abutting engagement with the spiral protrusion 231. The pin 511 is inserted into the through hole 222, so that the spiral protrusion 231 is prevented from rotating downward, which serves to further define the relative positions of the inner cylinder 23 and the outer cylinder 22.

As shown in fig. 5, 7 and 8, in the present embodiment, the pin 511 includes a plurality of pins, the through hole 222 includes a plurality of pins spaced apart from each other in the axial direction of the outer cylinder 22, the plurality of pins 511 and the plurality of through holes 222 are disposed in one-to-one correspondence, and the through holes 222 and the spiral grooves 221 are disposed at intervals. The plurality of pins 511 ensure the stability of the limit.

As shown in fig. 5, 7 and 8, in the present embodiment, the locking structure 50 further includes a second locking member 52, the second locking member 52 includes a bolt 521, a first threaded hole 232 extending in the axial direction of the inner cylinder 23 is provided on the spiral protrusion 231, a second threaded hole 223 extending in the axial direction of the outer cylinder 22 is provided on the inner side wall of the outer cylinder 22, the first threaded hole 232 and the second threaded hole 223 are concentrically arranged, and the bolt 521 is installed in the first threaded hole 232 and the second threaded hole 223. The bolt 521 rotates to the first threaded hole 232 and the second threaded hole 223, the first threaded hole 232 and the second threaded hole 223 are concentric and are arranged along the side wall of the adapter 20, and the arrangement mode can further prevent the inner cylinder 23 and the outer cylinder 22 from rotating relatively, so that the whole structure is more stable.

As shown in fig. 10, in the present embodiment, the limiting structure 30 includes a convex pillar 31 and a mounting groove 32, the convex pillar 31 is mounted in the mounting groove 32, one of the convex pillar 31 and the mounting groove 32 is disposed on the outer wall of the outer cylinder 22, and the other of the convex pillar 31 and the mounting groove 32 is disposed on the inner wall of the cup body 10. The limiting structure 30 is disposed such that the adapter 20 can be stably disposed inside the cup body 10, specifically, in the present embodiment, the protruding column 31 is disposed on the outer cylinder 22, and the mounting groove 32 is disposed inside the cup body 10.

As shown in fig. 10, in the present embodiment, the mounting groove 32 includes an axial groove 321 and a circumferential groove 322, the axial groove 321 communicates with the circumferential groove 322, the stud 31 enters the circumferential groove 322 from the axial groove 321, and the stud 31 is movably disposed in the width direction of the circumferential groove 322. The convex column 31 firstly enters the axial groove 321, enters the circumferential groove 322 through the axial groove 321, and rotates for a certain angle in the circumferential groove 322, so that the position of the adapter 20 is effectively limited, and the adapter 20 is prevented from being disengaged.

As shown in fig. 1 to 3, 6, 7 and 10, in the present embodiment, the rotation stopping structure 60 includes a plurality of protrusions 61 disposed at intervals on the end of the outer cylinder 22 and a plurality of recesses 62 disposed at intervals on the end of the cup body 10, the plurality of recesses 62 and the plurality of protrusions 61 are disposed in one-to-one correspondence, the protrusions 61 are installed in the recesses 62, wherein when the stud 31 is located in the axial groove 321, the protrusions 61 and the recesses 62 are disposed in a staggered manner, when the stud 31 moves along the circumferential groove 322, the protrusions 61 and the recesses 62 are disposed in a corresponding manner, and when the protrusion 61 enters the recess 62, the stud 31 moves in the width direction of the circumferential groove 322. The rotation stop structure 60 is provided to further define the positional relationship between the adapter 20 and the cup 10. This makes the position of the adapter cylinder 20 more stable.

As shown in fig. 1 to 3, in the present embodiment, the ball head assembly 40 includes an acetabular liner 41, a double acting head 42 and a ball head 43, the double acting head 42 is disposed in the acetabular liner 41, the ball head 43 is disposed in the double acting head 42, the acetabular liner 41 is disposed inside the adapter 20, a support protrusion 411 is disposed on a sidewall of the acetabular liner 41, and the support protrusion 411 is in abutting fit with the adapter 20. The arrangement enables the adapter cylinder 20 to limit the acetabular liner 41 and prevent the acetabular liner from falling out.

As shown in fig. 1 to 3, the acetabular prosthesis according to the present embodiment includes a cup body 10, an adapter 20, an acetabular liner, a double acting head, and a ball head. The cup body 10 is provided with an inner conical surface which is matched and locked with an outer conical surface of the adapter cylinder 20 in a conical manner, meanwhile, the adapter cylinder 20 is further provided with a rotation stopping structure 60, a convex block 61 is embedded into a concave part 62 of the cup body 10 and can prevent the adapter cylinder 20 from rotating, in addition, the adapter cylinder 20 is further provided with an inner conical surface which is matched and locked with an inner conical surface of the acetabular liner 41 in a conical manner, the inner spherical surface of the acetabular liner 41 is matched with the plastic double acting head 42 to form a first joint surface, and the double acting head 42 and the ball head 43 form a second joint surface, so that the double acting type acetabular prosthesis is formed.

As shown in fig. 1 to 10, the cup body 10 and the adapter 20 have a rotation stop structure 60 to prevent relative rotation, and the structure for preventing tilting is: an axial groove 321 and a circumferential groove 322 are formed in the cup body 10, a convex column 31 is arranged on the adapter cylinder 20, the convex column 31 is placed in alignment with the axial groove 321 during assembly, the adapter cylinder 20 is rotated when the convex column 31 enters the circumferential groove 322, and the convex column 61 is inserted into the concave part 62 of the cup body 10 after the convex column is rotated to a proper position, so that the assembly is in place. The width of the circumferential groove 322 is related to the position of the cone, that is, the cone starts to act when the convex column 31 reaches the upper plane of the circumferential groove 322, it should be noted that the width of the circumferential groove 322 is greater than the diameter of the convex column 31, so that the convex column 31 can move up and down in the circumferential groove 322, the adapter cylinder 20 can rotate, and when the adapter cylinder 20 rotates to a required position, the adapter cylinder 20 is locked. Of course, the circumferential groove can be a tapered groove, that is, the circumferential groove is in a necking shape, and the width of the circumferential groove below the axial groove is greater than the width of the circumferential grooves at other positions, so that the convex column can rotate in the circumferential groove without causing interference between the convex block and the cup body, and when the convex column is moved to a proper position, the convex block and the concave portion are matched, and thus assembly can be achieved. The axis of the inner cone of the adapter cylinder 20 is not coincident with the central axis of the cup body 10, but forms an angle, the prosthesis assembly is more suitable for a patient with hip firstly, in order to have good matching between the cup body 10 at the acetabulum side and an acetabulum socket of the patient, the abduction angle of the acetabulum is larger than that of a common patient, therefore, a certain anti-dropping function must be sacrificed by using the common acetabulum prosthesis. Meanwhile, by the prosthesis assembly of the technical scheme of the embodiment, the double-acting joint is realized, better postoperative mobility can be obtained through a large-diameter joint surface, and the dislocation rate is reduced. Through the design of the different bulb 43 central point of acetabular lining 41, can realize the demand of different femoral head eccentricities simultaneously, better matching patient reaches better postoperative muscle and ligament effect. In addition, when the cup is used by a common patient, the connecting component has another form which can be matched with the cup body 10, namely the inner cylinder body 23 and the outer cylinder body 22, the outer cone of the outer cylinder body 22 and the inner cone surface of the cup body 10 form cone matching locking, meanwhile, the convex block 61 of the outer cylinder body 22 is embedded into the concave part 62 of the cup body 10, the component is prevented from rotating, the prosthesis is unstable, and the operation fails, the axis of the inner cone of the outer cylinder body 22 is coincident with the central line of the cup body 10, the cup is suitable for the common patient, the inner cone of the outer cylinder body 22 is matched with the acetabular liner 41, and the acetabular liner 41 also has an anti-falling design, so that the cup can play a role in preventing falling for the common patient. The adjustment of the eccentricity of the femoral head can be realized by two ways:

the acetabular liner 41 has different femoral head eccentricity designs;

the outer cylinder 22 has different eccentricity designs, and different eccentricities are realized after the outer cylinder is matched with the acetabular liner 41.

As shown in fig. 1 to 10, the acetabular liner may be directly designed to change the eccentricity, which is particularly suitable for patients who are hip-first and are easy to dislocate, and common patients may also use the acetabular liner to improve the anti-dislocation performance, which is different from the existing substrate on the market in that the market may also implement a prosthesis with adjustable ball head eccentricity and ball head center position, but the material is plastic material such as polyethylene, etc., to form a common acetabular prosthesis. In addition, the adapter cylinder 20 has another implementation manner, which not only enables the rotation center of the ball head to rotate, but also enables the adjustment of the eccentric distance of the ball head by adjusting the adapter cylinder 20 (the current eccentric distance adjustment manner is that the ball head is used, the ball head has different neck lengths, the common neck lengths at present have different lengths such as-4, 0, +4, +7 (mm), and the like, when the required neck length is required, the ball head with + neck length needs to be used, the defect is that the eccentric distance of the femoral component is increased, the mechanical property of the femoral component is affected, and the required neck length is achieved by adjusting the eccentric distance of the adapter cylinder 20 in the scheme). The specific implementation mode is as follows: the adapter barrel 20 includes an outer barrel 22, an inner barrel 23, a capless bolt, and a pin 511. Wherein, the outer cylinder 22 is designed with a convex column 31, in order to prevent the matching between the adapter cylinder 20 and the cup body 10 from tilting, and further, the outer cylinder 22 is designed with a rotation stopping structure 60, which prevents rotation, and a spiral groove 221 is used in cooperation with the spiral protrusion 231 of the inner cylinder 23 (it should be noted here that, in order to adjust the rotation center of the ball head, the conical surfaces of the outer cylinder 22 and the inner cylinder 23 are both inclined, that is, not perpendicular to the end surface of the component, but when adjusting the eccentricity, the adjustment is required to be performed in the direction perpendicular to the end surface of the component, so the design of the spiral protrusion 231, the axis of which is perpendicular to the upper plane of the outer cylinder 22, causes the height of each layer of protrusion of the spiral protrusion 231 to be different, and the depth of the corresponding spiral groove 221 is also the same). When in use, the outer cylinder 22 is assembled with the cup body 10, the spiral protrusion 231 of the inner cylinder 23 is screwed in along the spiral groove 221, and the screwing mode is as follows: the inner cylinder 23 is provided with a first threaded hole 232 to be used in cooperation with a special tool, the inner cylinder 23 is rotated, a marking line is arranged on a tool hole at the side of the second threaded hole 223, each rotation can be determined, the adjusted eccentricity is constant, so that the eccentricity can be accurately adjusted, when the required eccentricity is adjusted, a cap-free bolt is used for fixing the inner cylinder 23 and the outer cylinder 22, the outer cylinder 22 is provided with the second threaded hole 223, the inner cylinder 23 is provided with the first threaded hole 232, the second threaded hole 223 and the first threaded hole 232 form a finished threaded hole to be used in cooperation with the cap-free bolt, in addition, in order to further stabilize the inner cylinder 23 and the outer cylinder 22, the outer cylinder 22 is provided with a through hole 222, the distance between the through holes 222 in the axial direction of the spiral groove 221 is 2mm (2 mm is an adjustable distance, the distance between the spiral protrusions 231 is also 2mm, if the distance is adjusted by other distances, the distance can be set to other distances in the same way), and similarly, small holes can be further formed in the inner cylinder 23, the pins 511 are transmitted into the holes of the inner cylinder 23 and the holes of the outer cylinder 22 to realize locking, and due to the installation of the lining, the pins 511 can be prevented from being withdrawn. The distance between the through holes 222 is 2mm which is the minimum unit of the adjustable eccentricity, and the depth of the second threaded hole 223 is longer than that of the cap-free bolt, so that the cap-free bolt can be completely screwed in no matter how much the relative eccentricity between the inner cylinder 23 and the outer cylinder 22 is adjusted. The head of the capless bolt is designed with a cross-shaped groove, and is screwed into the first threaded hole 232 by a matching tool, and the material can be titanium alloy, stainless steel or polyethylene and the like.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An acetabular prosthesis, comprising:

a cup body (10);

the adapter cylinder (20), the adapter cylinder (20) is movably arranged in the cup body (10), and a mounting hole (21) is formed in the adapter cylinder (20);

the limiting structure (30) is arranged between the cup body (10) and the adapter cylinder (20);

a ball head assembly (40), the ball head assembly (40) being rotatably disposed within the mounting hole (21);

an included angle is formed between the axis of the adapter cylinder (20) and the axis of the mounting hole (21);

the adapter cylinder (20) comprises an outer cylinder body (22) and an inner cylinder body (23), the inner cylinder body (23) is installed in the outer cylinder body (22), a locking structure (50) is arranged between the outer cylinder body (22) and the inner cylinder body (23), and the installation hole (21) is located in the inner cylinder body (23);

be provided with on the inner wall of outer barrel (22) helicla flute (221), be provided with spiral protrusion (231) on the outer wall of interior barrel (23), spiral protrusion (231) are located helicla flute (221) are internal and rotationally set up.

2. The acetabular prosthesis of claim 1, further comprising a rotation stop feature (60), the rotation stop feature (60) being disposed between the cup (10) and the outer barrel (22).

3. The acetabular prosthesis according to claim 1, wherein the locking structure (50) comprises a first locking member (51), the first locking member (51) comprises a pin (511), a through hole (222) is provided on the outer cylinder (22), and the pin (511) is inserted into the through hole (222) with interference and is in abutting engagement with the spiral protrusion (231).

4. The acetabular prosthesis according to claim 3, wherein the pin (511) comprises a plurality, the through hole (222) comprises a plurality arranged at intervals along an axial direction of the outer cylinder (22), the plurality of pins (511) and the plurality of through holes (222) are arranged in a one-to-one correspondence, and the through holes (222) and the spiral grooves (221) are arranged at intervals.

5. The acetabular prosthesis according to claim 1, wherein the locking structure (50) further comprises a second locking member (52), the second locking member (52) comprises a bolt (521), the spiral protrusion (231) is provided with a first threaded hole (232) extending in the axial direction of the inner cylinder (23), the inner side wall of the outer cylinder (22) is provided with a second threaded hole (223) extending in the axial direction of the outer cylinder (22), the first threaded hole (232) and the second threaded hole (223) are concentrically arranged, and the bolt (521) is installed in the first threaded hole (232) and the second threaded hole (223).

6. The acetabular prosthesis according to claim 2, wherein the stopper (30) comprises a boss (31) and a mounting groove (32), the boss (31) being mounted in the mounting groove (32), one of the boss (31) and the mounting groove (32) being provided on an outer wall of the outer barrel (22), the other of the boss (31) and the mounting groove (32) being provided on an inner wall of the cup (10).

7. The acetabular prosthesis according to claim 6, wherein the mounting groove (32) comprises an axial groove (321) and a circumferential groove (322), the axial groove (321) and the circumferential groove (322) communicating, the stud (31) entering from the axial groove (321) into the circumferential groove (322), the stud (31) being movably arranged in a width direction of the circumferential groove (322).

8. The acetabular prosthesis according to claim 7, wherein the rotation-stopping structure (60) includes a plurality of protrusions (61) spaced apart on an end of the outer cylinder (22) and a plurality of recesses (62) spaced apart on an end of the cup (10), the plurality of recesses (62) and the plurality of protrusions (61) being arranged in a one-to-one correspondence, the protrusions (61) being fitted into the recesses (62), wherein, when the convex column (31) is positioned in the axial groove (321), the convex block (61) and the concave part (62) are arranged in a staggered way, the convex block (61) and the concave part (62) are correspondingly arranged when the convex column (31) moves along the circumferential groove (322), and the stud (31) moves in the width direction of the circumferential groove (322) when the projection (61) enters the recess (62).

9. The acetabular prosthesis according to claim 1, wherein the ball head assembly (40) comprises an acetabular liner (41), a double acting head (42) and a ball head (43), the double acting head (42) being disposed in the acetabular liner (41), the ball head (43) being disposed within the double acting head (42), the acetabular liner (41) being disposed inside the adapter sleeve (20), a support protrusion (411) being disposed on a sidewall of the acetabular liner (41), the support protrusion (411) being in abutting engagement with the adapter sleeve (20).