CN210447285U - Hip joint system and acetabular prosthesis thereof - Google Patents

Abstract

The utility model relates to a hip joint system and acetabular bone false body thereof. The acetabulum prosthesis comprises an acetabulum cup and an acetabulum lining, the acetabulum cup is provided with an accommodating cavity, a cavity wall of the accommodating cavity is provided with a mounting groove, the mounting groove comprises an embedded groove extending along the depth direction of the accommodating cavity and at least two rotating grooves arranged at intervals in the depth direction of the accommodating cavity, and the rotating grooves are communicated with the embedded groove. The acetabulum inside lining sets up in the holding intracavity, and the acetabulum inside lining is equipped with the boss, and the boss can be through embedding groove embedding arbitrary rotation inslot. The acetabulum prosthesis has high universality and can be suitable for patients with different eccentricities.

Description

Hip joint system and acetabular prosthesis thereof

Technical Field

The utility model relates to the technical field of medical equipment, especially relate to a hip joint system and acetabular bone false body thereof.

Background

Artificial joint replacement, which is currently the best arthroplasty, brings life hopes to many patients, retains joint function, reduces patient pain, and improves patient quality of life. Hip arthroplasty is the most clinically effective arthroplasty.

In hip arthroplasty, it is necessary to restore the normal eccentricity of the femur in order to obtain the proper abducting muscle strength. Eccentricity is the perpendicular distance between the center of the femoral head and the longitudinal axis of the femoral shaft. Insufficient eccentricity reconstruction can affect the gait of the patient, while too long eccentricity can result in excessive pressure on the surrounding soft tissues. Anatomically, the femoral eccentricity of a normal human varies greatly among individuals, ranging from a minimum of 20mm to a maximum of 60 mm. Therefore, when different patients select the same type of universal prosthesis, the femoral head center of the prosthesis is not overlapped with the original femoral head center of the patient, so that the stress condition of the hip abduction muscle group of the patient is changed, and the normal life of the patient after the operation is influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need to provide a hip joint system and an acetabular prosthesis thereof, which can improve the versatility of the prosthesis in hip replacement surgery.

An acetabular prosthesis comprising:

the acetabulum cup is provided with an accommodating cavity, the cavity wall of the accommodating cavity is provided with a mounting groove, the mounting groove comprises an embedded groove extending along the depth direction of the accommodating cavity and at least two rotating grooves arranged at intervals in the depth direction of the accommodating cavity, and the rotating grooves are communicated with the embedded groove;

the acetabulum inner liner is arranged in the accommodating cavity and is provided with a boss, and the boss can be embedded into any one of the rotating grooves through the embedding groove.

The acetabular prosthesis is provided with an embedded groove and at least two rotating grooves on the cavity wall of the acetabular cup, and the boss on the acetabular liner can be embedded into any rotating groove through the embedded groove. Because the depth of the rotating groove in the acetabular cup is different, the boss is embedded into different rotating grooves, so that the relative position of the acetabular liner and the acetabular cup can be changed, and the central position of the articular surface of the acetabulum can be changed due to the change of the relative position of the acetabular liner and the acetabular cup. Because the center of the femoral head is overlapped with the center of the acetabulum articular surface, the central position of the femoral head can be adjusted by changing the central position of the acetabulum articular surface. So the femoral head central position according to different patients is different to imbed the boss in the suitable swivelling chute, thereby guarantee that the femoral head central position of false body overlaps with the femoral head center that the patient originally, make the eccentricity of false body more be close to the eccentricity of patient itself, improved the operation effect. In other words, the acetabular prosthesis has high universality and can be suitable for patients with different eccentricities.

In one embodiment, one end of each rotary groove far away from the embedded groove is provided with a clamping position, and the boss can be clamped with the clamping position.

In one embodiment, the number of the mounting grooves is at least two, at least two mounting grooves are arranged at intervals along the circumferential direction of the acetabular cup, and the number of the bosses is matched with that of the mounting grooves.

In one embodiment, the acetabular prosthesis further comprises a retaining member that connects the acetabular cup and the acetabular liner to retain the acetabular cup and the acetabular liner.

In one embodiment, the acetabular cup defines an assembly groove extending through a wall of the receiving cavity, the acetabular liner defines a locking groove, the assembly groove communicates with the locking groove, and the locking member is disposed in the assembly groove and the locking groove to lock the acetabular cup and the acetabular liner.

In one embodiment, the number of the locking grooves is at least two, at least two of the locking grooves are arranged at intervals in the height direction of the acetabular liner, and the interval between two adjacent locking grooves is equal to the interval between two adjacent rotating grooves.

In one embodiment, the number of the assembling grooves is at least two, the assembling grooves are arranged at intervals along the circumferential direction of the acetabular cup, and the number of the locking pieces is matched with the number of the assembling grooves.

In one embodiment, the retaining member is annular and has an opening.

In one embodiment, the acetabular liner comprises a first portion made of a metal material on which the boss is disposed and a second portion made of a plastic material, an end of the second portion remote from the first portion being provided with an articular surface for mating with a femoral head.

A hip joint system comprises a femoral prosthesis and the acetabular prosthesis, wherein the femoral prosthesis is rotatably connected with the acetabular prosthesis.

The hip joint system is provided with an embedded groove and at least two rotating grooves on the cavity wall of the acetabular cup, the boss on the acetabular liner can be embedded into any rotating groove through the embedded groove, the bosses are embedded into different rotating grooves due to different depths of the rotating grooves in the accommodating cavity, so that the relative positions of the acetabular liner and the acetabular cup can be changed, and the central position of the acetabular joint surface can be changed by changing the relative positions of the acetabular liner and the acetabular cup. Because the center of the femoral head is overlapped with the center of the acetabulum articular surface, the central position of the femoral head can be adjusted by changing the central position of the acetabulum articular surface. Therefore, according to different femoral head center positions of different patients, the boss is embedded into the proper rotating groove, so that the femoral head center position of the hip joint prosthesis is ensured to be the same as the original femoral head center of the patient, the eccentric distance of the hip joint prosthesis is closer to the eccentric distance of the patient, and the operation effect is improved. In other words, the hip joint prosthesis has high universality and can be suitable for patients with different eccentricities.

Drawings

FIG. 1 is an exploded view of the structure of an acetabular prosthesis according to an embodiment;

FIG. 2 is a schematic view of the acetabular cup of the acetabular prosthesis shown in FIG. 1;

FIG. 3 is a schematic structural view of an acetabular liner of the acetabular prosthesis shown in FIG. 1;

FIG. 4 is a schematic view of an installation of an acetabular prosthesis according to an embodiment;

FIG. 5 is a schematic view of an embodiment of an installation of a retaining member of the acetabular prosthesis shown in FIG. 1;

fig. 6 is an exploded view of the hip joint system according to an embodiment.

Description of reference numerals:

100. an acetabular prosthesis; 110. an acetabular cup; 111. an accommodating cavity; 112. mounting grooves; 113. a groove is embedded; 114. a rotating tank; 115. clamping; 116. assembling a groove; 117. an end face; 120. an acetabular liner; 121. a boss; 122. a locking groove; 123. a joint surface; 124. a first part; 125. a second section; 10. a hip joint system; 200. a femoral prosthesis; 210. the femoral head; 220. a femoral stem.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms other than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," "up," "down," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the present invention, the terms "first" and "second" do not denote any particular quantity or order, but are merely used to distinguish names.

Referring to fig. 1-3, embodiments of the present application provide an acetabular prosthesis 100 for use in replacing a diseased acetabulum of a patient in a hip arthroplasty. Specifically, the acetabular prosthesis 100 of an embodiment includes an acetabular cup 110 and an acetabular liner 120. Wherein the acetabular cup 110 is semicircular overall, and the acetabular cup 110 is provided with a receiving cavity 111 which can receive the acetabular liner 120. Further, a mounting groove 112 is formed on the wall of the accommodating cavity 111 for mounting and fixing the acetabular liner 120. Specifically, the mounting groove 112 includes an insertion groove 113 and at least two rotation grooves 114, wherein the insertion groove 113 extends along the depth direction of the receiving cavity 111 and penetrates the end surface 117 of the acetabular cup 110. At least two rotating grooves 114 are arranged at intervals in the depth direction of the accommodating cavity 111, and each rotating groove 114 extends along the circumferential direction of the acetabular cup 110. And each rotation groove 114 communicates with the insertion groove 113. The depth direction is a direction that is downward in the axial direction of the acetabular cup 110 when the concave surface of the acetabular cup 110 is facing upward.

The acetabular liner 120 is used to connect with a femoral head of a femoral prosthesis, and specifically, an end of the acetabular liner 120 remote from the acetabular cup 110 is provided with a spherical articular surface 123 capable of receiving the femoral head, so that the acetabular liner 120 forms a rotational fit with the femoral head. Further, the acetabular liner 120 is disposed in the receiving cavity 111 of the acetabular cup 110, and the acetabular liner 120 is provided with a boss 121 matching with the mounting groove 112. Specifically, the boss 121 can be moved along the insertion slot 113 to allow the acetabular liner 120 to enter the receiving cavity 111. Since each rotation groove 114 is communicated with the insertion groove 113, when the boss 121 is moved to any rotation groove 114 position, the boss 121 can be inserted into any rotation groove 114 by rotating the acetabular liner 120 towards the rotation groove 114, so as to fix the depth of the acetabular liner 120 entering the receiving cavity 111. Since the number of the rotation grooves 114 is at least two, for example, the number of the rotation grooves 114 shown in fig. 1 is four, and the four rotation grooves 114 are arranged at intervals in the depth direction of the accommodating cavity 111, that is, the depths of the different rotation grooves 114 in the accommodating cavity 111 are different, the depth of the acetabular liner 120 entering the accommodating cavity 111 can be changed by inserting the bosses 121 into the different rotation grooves 114, and thus the relative position of the acetabular liner 120 and the acetabular cup 110 is changed.

The acetabular prosthesis 100 has an insertion groove 113 and at least two rotation grooves 114 in the cavity wall of the acetabular cup 110, and the boss 121 of the acetabular liner 120 can be inserted into any one of the rotation grooves 114 through the insertion groove 113. Because the depth of the rotation slots 114 in the acetabular cup 110 is different, inserting the bosses 121 into different rotation slots 114 changes the relative position of the acetabular liner 120 and the acetabular cup 110, and changes the relative position of the acetabular liner 120 and the acetabular cup 110 changes the center position of the acetabular articular surface. Because the center of the femoral head is overlapped with the center of the acetabulum articular surface, the central position of the femoral head can be adjusted by changing the central position of the acetabulum articular surface. Therefore, the center positions of the femoral heads of different patients are different, the boss 121 is embedded into the proper rotating groove 114, the center position of the femoral head of the prosthesis is overlapped with the center of the original femoral head of the patient, the eccentricity of the prosthesis is closer to the eccentricity of the patient, and the operation effect is improved. In other words, the acetabular prosthesis 100 described above is highly versatile and can be adapted to patients of different eccentricities.

Referring to fig. 2, each rotation slot 114 has a detent 115 at an end thereof remote from the insertion slot 113, and the boss 121 can engage with the detent 115 to limit circumferential rotation of the acetabular liner 120 and the acetabular cup 110.

Further, the number of the mounting grooves 112 is at least two, and the at least two mounting grooves 112 are spaced apart along the circumference of the acetabular cup 110. For example, as shown in FIG. 2, the number of the mounting slots 112 is six, and the six mounting slots 112 are evenly spaced along the circumference of the acetabular cup 110. Each of the mounting grooves 112 includes one fitting groove 113 and at least two rotation grooves 114. For example, one insertion groove 113 shown in fig. 2 corresponds to four rotation grooves 114. It should be noted that the number of the rotating grooves 114 is not limited to four in the present embodiment, and may be two, three, five or more, and may be determined according to the length and precision of the distance to be adjusted. Correspondingly, the number of the bosses 121 matches with the mounting grooves 112. And the position of the boss 121 also corresponds to the position of the fitting groove 113.

With continued reference to fig. 1, the acetabular prosthesis 100 further includes a retaining member 130, the retaining member 130 simultaneously engaging the acetabular cup 110 and the acetabular liner 120 to retain the acetabular cup 110 and the acetabular liner 120 against axial movement relative to each other.

Further, the acetabular cup 110 has an assembly groove 116 penetrating the wall of the receiving cavity 111, the acetabular liner 120 has a locking groove 122, the assembly groove 116 is communicated with the locking groove 122, and the locking member 130 is disposed in the assembly groove 116 and the locking groove 122 to lock the acetabular cup 110 and the acetabular liner 120. Further, the number of the locking grooves 122 is at least two, and the at least two locking grooves 122 are spaced apart in the height direction of the acetabular liner 120. The spacing between two adjacent locking grooves 122 is equal to the spacing between two adjacent rotation grooves 114, so that when the boss 121 is inserted into a certain rotation groove 114, one locking groove 122 is communicated with the assembly groove 116, so that the locking member 130 locks the acetabular cup 110 and the acetabular liner 120.

Further, referring to fig. 2, the number of assembly slots 116 is at least two, with at least two of the assembly slots 116 being spaced apart along the circumference of the acetabular cup 110, such as shown in fig. 1, where the number of assembly slots 116 is two and two of the assembly slots 116 are spaced apart along the circumference of the acetabular cup 110. The mounting slot 116 is a circular arc shaped slot, and the size of the mounting slot 116 is just enough to accommodate the locking member 130. Further, the number of retaining members 130 matches the number of assembly slots 116, and the stability of the assembly of the acetabular prosthesis 100 is enhanced by at least two retaining members 130 locking the acetabular cup 110 and the acetabular liner 120.

Referring to fig. 1, in one embodiment, the retaining member 130 is a retaining ring, specifically, the retaining member 130 is made of a metal material, and the retaining member 130 is annular and has an opening, in other words, the retaining member 130 is curved, so that the retaining member 130 can be elastically deformed, thereby further enhancing the retaining effect on the acetabular cup 110 and the acetabular liner 120. It should be noted that the retaining member 130 can have other forms, and in other embodiments, the retaining member 130 can be a screw or bolt that connects the acetabular cup 110 and the acetabular liner 120 so that the acetabular cup 110 and the acetabular liner 120 are fixed relative to each other.

Referring to fig. 3, the acetabular liner 120 includes a first portion 124 made of a metal material and a second portion 125 made of a plastic material, and the first portion 124 and the second portion 125 are connected by press-fitting, adhesion, or screwing. The boss 121 is provided on the first portion 124, thereby securing the strength of the boss 121. The locking groove 122 is disposed on the second portion 125, and an articular surface 123 for matching with a femoral head is disposed at an end of the second portion 125 away from the first portion 124, so that the metallic femoral head prosthesis is generally made of a metal material, and the metallic femoral head prosthesis is matched with the plastic articular surface 123, thereby avoiding the wear problem caused by the matching of metal and metal, and improving the service life of the acetabular prosthesis 100.

The using method of the acetabular prosthesis 100 comprises the following steps:

s1, the acetabular cup 110 is installed into the patient' S acetabulum in accordance with surgical techniques.

S2, as shown in FIG. 4, the acetabular liner 120 is aligned with the receiving cavity 111 of the acetabular cup 110 and the boss 121 is placed into the insertion slot 113. The acetabular liner 120 is moved along the insertion slot 113, the desired rotation slot 114 is selected, and the acetabular liner 120 is rotated such that the boss 121 enters the rotation slot 114 until it is recessed into the detent 115, at which time the acetabular cup 110 and the acetabular liner 120 can no longer rotate circumferentially relative to each other.

3 As shown in FIG. 5, a special tool is used to place the retaining member 130 from the assembly slot 116 in the acetabular cup 110 and to extend the retaining member 130 into the locking slot 122 in the acetabular liner 120 so that a portion of the retaining member 130 is in the locking slot 122 in the acetabular liner 120 and another portion is in the assembly slot 116 in the acetabular cup 110 to provide a stop.

Referring to fig. 1 and 6, embodiments of the present application also provide a hip joint system 10, in particular. The hip joint system 10 of an embodiment includes the femoral prosthesis 200 and the acetabular prosthesis 100 of any of the above embodiments, the femoral prosthesis 200 being rotatably coupled to the acetabular prosthesis 100. Specifically, the femoral prosthesis 200 includes a femoral stem 220 and a femoral head 210 disposed at one end of the femoral stem 220. Acetabular liner 120 of acetabular prosthesis 100 is provided with an articular surface 123 that receives femoral head 210, and femoral head 210 is disposed within articular surface 123 to form a rotational connection with acetabular liner 120.

The hip joint system 10 has an insertion groove 113 and at least two rotation grooves 114 formed in the cavity wall of the acetabular cup 110, and the boss 121 of the acetabular liner 120 can be inserted into any one of the rotation grooves 114 through the insertion groove 113. Because the depth of the rotation slots 114 in the acetabular cup 110 is different, inserting the bosses 121 into different rotation slots 114 changes the relative position of the acetabular liner 120 and the acetabular cup 110, and changes the relative position of the acetabular liner 120 and the acetabular cup 110 changes the center position of the acetabular articular surface. Because the center of the femoral head is overlapped with the center of the acetabulum articular surface, the central position of the femoral head can be adjusted by changing the central position of the acetabulum articular surface. Therefore, the boss 121 is embedded into the proper rotating groove 114 according to different femoral head 210 center positions of different patients, so that the femoral head 210 center position of the hip joint system 10 is ensured to be the same as the original femoral head center of the patient, the eccentricity of the hip joint system 10 is closer to the eccentricity of the patient, and the operation effect is improved. In other words, the hip system 10 described above can be adapted to patients with different eccentricities, improving the versatility of the hip system 10.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. An acetabular prosthesis, comprising:

the acetabulum cup is provided with an accommodating cavity, the cavity wall of the accommodating cavity is provided with a mounting groove, the mounting groove comprises an embedded groove extending along the depth direction of the accommodating cavity and at least two rotating grooves arranged at intervals in the depth direction of the accommodating cavity, and the rotating grooves are communicated with the embedded groove;

the acetabulum inner liner is arranged in the accommodating cavity and is provided with a boss, and the boss can be embedded into any one of the rotating grooves through the embedding groove.

2. The acetabular prosthesis of claim 1, wherein each of the rotation slots has a detent at an end thereof distal to the insertion slot, the boss being engageable with the detent.

3. The acetabular prosthesis of claim 1, wherein the number of mounting slots is at least two, at least two of the mounting slots being spaced apart circumferentially of the acetabular cup, the number of bosses matching the number of mounting slots.

4. The acetabular prosthesis of claim 1, further comprising a retaining member connecting the acetabular cup and the acetabular liner to retain the acetabular cup and the acetabular liner.

5. The acetabular prosthesis of claim 4, wherein the acetabular cup defines an assembly slot extending through a wall of the receiving cavity, the acetabular liner defines a locking slot, the assembly slot communicates with the locking slot, and the retaining member is disposed in the assembly slot and the locking slot to retain the acetabular cup and the acetabular liner.

6. The acetabular prosthesis of claim 5, wherein the number of the locking grooves is at least two, at least two of the locking grooves are spaced apart in a height direction of the acetabular liner, and a spacing between adjacent two of the locking grooves is equal to a spacing between adjacent two of the rotation grooves.

7. The acetabular prosthesis of claim 5, wherein the number of assembly slots is at least two, at least two of the assembly slots being spaced apart circumferentially of the acetabular cup, the number of retaining members matching the number of assembly slots.

8. The acetabular prosthesis of claim 5, wherein the retaining member is annular and has an opening.

9. The acetabular prosthesis of claim 1, wherein the acetabular liner includes a first portion made of a metallic material and a second portion made of a plastic material, the boss being disposed on the first portion, an end of the second portion distal to the first portion being provided with an articulating surface for mating with a femoral head.

10. A hip joint system comprising a femoral prosthesis and an acetabular prosthesis according to any one of claims 1 to 9, the femoral prosthesis being rotatably connected to the acetabular prosthesis.

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