Hip joint system and its acetabular prosthesis

Abstract

The present invention relates to a hip joint system and an acetabular prosthesis thereof. The acetabular prosthesis includes an acetabular cup and an acetabular liner. The acetabular cup is provided with a receiving cavity, and the cavity wall of the receiving cavity is provided with a mounting groove. The mounting groove includes an embedding groove extending along the depth direction of the receiving cavity and at least two rotating grooves spaced apart in the depth direction of the receiving cavity. The rotating grooves communicate with the embedding groove. The acetabular liner is disposed in the receiving cavity, and the acetabular liner is provided with a boss, and the boss can be embedded into any one of the rotating grooves through the embedding groove. The above-mentioned acetabular prosthesis has high versatility and can be applicable to patients with different eccentric distances.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a hip joint system and an acetabular prosthesis thereof. Background Art

[0002] Artificial joint replacement is currently the best joint arthroplasty. Joint replacement brings hope to many patients. It preserves joint function, reduces patient pain, and improves the quality of life of patients. Among them, hip joint replacement has the best clinical effect in joint replacement.

[0003] In hip joint replacement, it is necessary to restore the normal femoral offset to obtain appropriate abductor muscle strength. The offset refers to the perpendicular distance between the center of the femoral head and the longitudinal axis of the femoral shaft. Insufficient reconstruction of the offset will affect the patient's gait, while an overly long offset will cause excessive pressure on the surrounding soft tissues. Anatomically, the individual differences in femoral offset in the normal human body are very large, ranging from a minimum of 20 mm to a maximum of 60 mm. Therefore, when the same model of a general prosthesis is selected for different patients, it is very likely that the center of the femoral head of the prosthesis does not overlap with the center of the original femoral head of the patient, resulting in a change in the force-bearing situation of the hip abductor muscles of the patient and affecting the patient's normal life after surgery. Summary of the Invention

[0004] Based on this, it is necessary to provide a hip joint system and an acetabular prosthesis thereof for the problem of how to improve the versatility of the prosthesis in hip joint replacement.

[0005] An acetabular prosthesis, comprising:

[0006] An acetabular cup, provided with a receiving cavity, the cavity wall of the receiving cavity is provided with a mounting groove, the mounting groove includes an embedding groove extending along the depth direction of the receiving cavity and at least two rotating grooves spaced apart in the depth direction of the receiving cavity, and the rotating grooves communicate with the embedding groove;

[0007] An acetabular liner, disposed in the receiving cavity, the acetabular liner is provided with a boss, and the boss can be embedded into any one of the rotating grooves through the embedding groove.

[0008] The above acetabular prosthesis has an embedding 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 one of the rotating grooves through the embedding groove. Since the depths of the rotating grooves in the acetabular cup are different, embedding the boss into different rotating grooves can change the relative position between the acetabular liner and the acetabular cup, and changing the relative position between the acetabular liner and the acetabular cup can change the central position of the acetabular joint surface. Since the center of the femoral head overlaps with the center of the acetabular joint surface, the central position of the femoral head can be adjusted by changing the central position of the acetabular joint surface. In this way, according to the different central positions of the femoral heads of different patients, the boss can be embedded into the appropriate rotating groove, so as to ensure that the central position of the femoral head of the prosthesis overlaps with the original central position of the femoral head of the patient, making the eccentricity of the prosthesis closer to the eccentricity of the patient itself and improving the surgical effect. In other words, the above acetabular prosthesis has high versatility and can be applied to patients with different eccentricities.

[0009] In one embodiment, each end of each of the rotating grooves away from the embedding groove has a clamping position, and the boss can be clamped with the clamping position.

[0010] In one embodiment, the number of the mounting grooves is at least two, at least two of the mounting grooves are arranged at intervals along the circumferential direction of the acetabular cup, and the number of the bosses matches the number of the mounting grooves.

[0011] In one embodiment, the acetabular prosthesis further includes a locking member, and the locking member connects the acetabular cup and the acetabular liner to lock the acetabular cup and the acetabular liner.

[0012] In one embodiment, the acetabular cup is provided with an assembly groove penetrating through the cavity wall of the accommodating cavity, the acetabular liner is provided with a locking groove, the assembly groove communicates with the locking groove, and the locking member is arranged in the assembly groove and the locking groove to lock the acetabular cup and the acetabular liner.

[0013] 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.

[0014] In one embodiment, the number of the assembly grooves is at least two, at least two of the assembly grooves are arranged at intervals along the circumferential direction of the acetabular cup, and the number of the locking members matches the number of the assembly grooves.

[0015] In one embodiment, the locking member is annular and has an opening.

[0016] In one embodiment, the acetabular liner includes a first part made of a metallic material and a second part made of a plastic. The boss is disposed on the first part, and a joint surface for cooperating with the femoral head is provided at one end of the second part away from the first part.

[0017] A hip joint system includes a femoral prosthesis and the above-mentioned acetabular prosthesis, and the femoral prosthesis is rotatably connected to the acetabular prosthesis.

[0018] In the above hip joint system, an embedding groove and at least two rotating grooves are formed on the cavity wall of the acetabular cup, and the boss on the acetabular liner can be embedded into any one of the rotating grooves through the embedding groove. Since the depths of the rotating grooves in the accommodating cavity are different, embedding the boss into different rotating grooves can change the relative position between the acetabular liner and the acetabular cup. Changing the relative position between the acetabular liner and the acetabular cup can change the central position of the acetabular joint surface. Since the center of the femoral head overlaps with the center of the acetabular joint surface, the central position of the femoral head can be adjusted by changing the central position of the acetabular joint surface. Thus, according to the different central positions of the femoral heads of different patients, by embedding the boss into the appropriate rotating groove, the central position of the femoral head of the hip joint prosthesis is ensured to be the same as the original central position of the femoral head of the patient, so that the offset of the hip joint prosthesis is closer to the offset of the patient himself, improving the surgical effect. In other words, the above hip joint prosthesis has high versatility and can be applied to patients with different offsets. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an exploded view of the structure of an acetabular prosthesis according to an embodiment;

[0020] Figure 2 is Figure 1 a schematic structural view of the acetabular cup of the acetabular prosthesis shown in

[0021] Figure 3 is Figure 1 a schematic structural view of the acetabular liner of the acetabular prosthesis shown in

[0022] Figure 4 is an installation schematic view of an acetabular prosthesis according to an embodiment;

[0023] Figure 5 is an Figure 1 installation schematic view of the locking member of the acetabular prosthesis shown in

[0024] Figure 6 is an exploded view of the structure of a hip joint system according to an embodiment.

[0025] DESCRIPTION OF THE REFERENCE NUMERALS:

[0026] 100, Acetabular prosthesis; 110, Acetabular cup; 111, Receiving cavity; 112, Mounting groove; 113, Embedding groove; 114, Rotating groove; 115, Clamping position; 116, Assembly groove; 117, End face; 120, Acetabular liner; 121, Boss; 122, Locking groove; 123, Articular surface; 124, First part; 125, Second part; 10, Hip joint system; 200, Femoral prosthesis; 210, Femoral head; 220, Femoral stem. Detailed implementation manners

[0027] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] The "first" and "second" described in the present invention do not represent specific quantities and orders, but are only used for name distinction.

[0031] See Figures 1-3, embodiments of the present application provide an acetabular prosthesis 100 for replacing a diseased acetabulum of a patient during hip replacement surgery. Specifically, an acetabular prosthesis 100 in one embodiment includes an acetabular cup 110 and an acetabular liner 120. The acetabular cup 110 is generally semi-circular in shape, and the acetabular cup 110 is provided with a receiving cavity 111 for receiving the acetabular liner 120. Further, an installation groove 112 is formed on the cavity wall of the receiving cavity 111 for installing and fixing the acetabular liner 120. Specifically, the installation groove 112 includes an embedding groove 113 and at least two rotation grooves 114, wherein the embedding groove 113 extends along the depth direction of the receiving cavity 111 and penetrates through the end face 117 of the acetabular cup 110. The at least two rotation grooves 114 are spaced apart in the depth direction of the receiving cavity 111, and each rotation groove 114 extends along the circumferential direction of the acetabular cup 110. And each rotation groove 114 communicates with the embedding groove 113. The depth direction described herein refers to the direction along the axis of the acetabular cup 110 downward when the concave surface of the acetabular cup 110 faces upward.

[0032] The acetabular liner 120 is used to connect with the femoral head of the femoral prosthesis. Specifically, a spherical joint surface 123 for receiving the femoral head is provided at one end of the acetabular liner 120 away from the acetabular cup 110, 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 a boss 121 is provided on the acetabular liner 120 to cooperate with the installation groove 112. Specifically, the boss 121 can move along the embedding groove 113 to enable the acetabular liner 120 to enter the receiving cavity 111. Since each rotation groove 114 communicates with the embedding groove 113, when the boss 121 moves to the position of any rotation groove 114, by rotating the acetabular liner 120 in the direction of that rotation groove 114, the boss 121 can be embedded into any rotation groove 114 to fix the depth of the acetabular liner 120 entering the receiving cavity 111. Since the number of rotation grooves 114 is at least two, for example Figure 1 as shown, the number of rotation grooves 114 is four, and the four rotation grooves 114 are spaced apart in the depth direction of the receiving cavity 111, that is, the depths of different rotation grooves 114 in the receiving cavity 111 are different. Thus, by embedding the boss 121 into different rotation grooves 114, the depth of the acetabular liner 120 entering the receiving cavity 111 can be changed, and further the relative position between the acetabular liner 120 and the acetabular cup 110 can be changed.

[0033] The above acetabular prosthesis 100 has an embedding groove 113 and at least two rotating grooves 114 formed on the cavity wall of the acetabular cup 110, and the boss 121 on the acetabular liner 120 can be embedded into any one of the rotating grooves 114 through the embedding groove 113. Since the depths of the rotating grooves 114 in the acetabular cup 110 are different, embedding the boss 121 into different rotating grooves 114 can change the relative position between the acetabular liner 120 and the acetabular cup 110, and changing the relative position between the acetabular liner 120 and the acetabular cup 110 can change the central position of the acetabular joint surface. Since the center of the femoral head overlaps with the center of the acetabular joint surface, the central position of the femoral head can be adjusted by changing the central position of the acetabular joint surface. Thus, according to the different central positions of the femoral heads of different patients, the boss 121 is embedded into a suitable rotating groove 114, ensuring that the central position of the femoral head of the prosthesis overlaps with the original central position of the femoral head of the patient, making the eccentricity of the prosthesis closer to the eccentricity of the patient itself and improving the surgical effect. In other words, the above acetabular prosthesis 100 has high versatility and can be applied to patients with different eccentricities.

[0034] See Figure 2 , one end of each rotating groove 114 away from the embedding groove 113 has a clamping position 115, and the boss 121 can be clamped with the clamping position 115 to limit the circumferential rotation of the acetabular liner 120 and the acetabular cup 110.

[0035] Furthermore, the number of the mounting grooves 112 is at least two, and the at least two mounting grooves 112 are arranged at intervals along the circumference of the acetabular cup 110. For example Figure 2 as shown, the number of the mounting grooves 112 is six, and the six mounting grooves 112 are evenly arranged at intervals along the circumference of the acetabular cup 110. Each mounting groove 112 includes an embedding groove 113 and at least two rotating grooves 114. For example Figure 2 as shown, one embedding groove 113 corresponds to four rotating grooves 114. It should be noted that the number of the rotating grooves 114 is not limited to four in this embodiment, and can also be two, three, five or more, and can be determined according to the required distance length and accuracy. Correspondingly, the number of the bosses 121 matches the number of the mounting grooves 112. And the position of the boss 121 also corresponds to the position of the embedding groove 113.

[0036] Continue to refer to Figure 1 , the acetabular prosthesis 100 further includes a locking member 130, and the locking member 130 is connected to both the acetabular cup 110 and the acetabular liner 120 at the same time to lock the acetabular cup 110 and the acetabular liner 120 to prevent axial displacement of the acetabular cup 110 and the acetabular liner 120.

[0037] Further, the acetabular cup 110 is provided with an assembly groove 116 penetrating through the wall of the accommodating cavity 111. The acetabular liner 120 is provided with a locking groove 122. The assembly groove 116 communicates with the locking groove 122. 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 still, 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 interval between two adjacent locking grooves 122 is equal to the interval between two adjacent rotating grooves 114. Thus, after the boss 121 is inserted into a certain rotating groove 114, a corresponding locking groove 122 will communicate with the assembly groove 116, so that the locking member 130 locks the acetabular cup 110 and the acetabular liner 120.

[0038] Further, referring to Figure 2 , the number of the assembly grooves 116 is at least two, and the at least two assembly grooves 116 are spaced apart along the circumferential direction of the acetabular cup 110. For example, Figure 1 as shown, the number of the assembly grooves 116 is two, and the two assembly grooves 116 are spaced apart along the circumferential direction of the acetabular cup 110. The assembly groove 116 is an arc-shaped groove, and the size of the assembly groove 116 is just large enough to allow the locking member 130 to enter. Further, the number of the locking members 130 matches the number of the assembly grooves 116. The acetabular cup 110 and the acetabular liner 120 are locked by at least two locking members 130, enhancing the assembly stability of the acetabular prosthesis 100.

[0039] Referring to Figure 1 , in one embodiment, the locking member 130 is a snap ring. Specifically, the material of the locking member 130 is a metal material, and the locking member 130 is annular and has an opening. In other words, the locking member 130 is arc-shaped, so that the locking member 130 can generate elastic deformation, further strengthening the locking effect on the acetabular cup 110 and the acetabular liner 120. It should be noted that the locking member 130 has other forms. In other embodiments, the locking member 130 can also be a screw or a bolt, and the acetabular cup 110 and the acetabular liner 120 are connected by the screw or the bolt to make the acetabular cup 110 and the acetabular liner 120 relatively fixed.

[0040] Referring to Figure 3, the acetabular liner 120 includes a first part 124 made of a metallic material and a second part 125 made of a plastic material. The first part 124 and the second part 125 are connected by means of press-fitting, adhesion, screw connection or the like. The boss 121 is provided on the first part 124, thus ensuring the strength of the boss 121. The locking groove 122 is provided on the second part 125, and an articular surface 123 for cooperating with the femoral head is provided at one end of the second part 125 away from the first part 124. Since the femoral head prosthesis is generally made of a metallic material, the cooperation between the metallic femoral head prosthesis and the plastic articular surface 123 can avoid the wear problem caused by the cooperation of metal with metal, and improve the service life of the acetabular prosthesis 100.

[0041] The usage method of the above-mentioned acetabular prosthesis 100 is as follows:

[0042] S1: According to the surgical technique, the acetabular cup 110 is installed into the patient's acetabulum.

[0043] S2: As Figure 4 shown, the acetabular liner 120 is aligned with the accommodating cavity 111 of the acetabular cup 110, and the boss 121 is placed into the embedding groove 113. Move the acetabular liner 120 along the embedding groove 113, select the required rotation groove 114, and rotate the acetabular liner 120 so that the boss 121 enters the rotation groove 114 until it sinks into the clamping position 115. At this time, the acetabular cup 110 and the acetabular liner 120 can no longer rotate relative to each other circumferentially.

[0044] S3: As Figure 5 shown, using a special tool, the locking member 130 is placed into the assembly groove 116 on the acetabular cup 110 and the locking member 130 is extended into the locking groove 122 of the acetabular liner 120, so that a part of the locking member 130 is in the locking groove 122 of the acetabular liner 120 and another part is in the assembly groove 116 of the acetabular cup 110 to play a role in limiting the position.

[0045] Referring to Figure 1 and Figure 6 , the embodiment of the present application further provides a hip joint system 10. Specifically. The hip joint system 10 of an embodiment includes a femoral prosthesis 200 and the acetabular prosthesis 100 of any one of the above embodiments. The femoral prosthesis 200 and the acetabular prosthesis 100 are rotatably connected. Specifically, the femoral prosthesis 200 includes a femoral stem 220 and a femoral head 210 provided at one end of the femoral stem 220. The acetabular liner 120 of the acetabular prosthesis 100 is provided with an articular surface 123 capable of accommodating the femoral head 210, and the femoral head 210 is disposed in the articular surface 123 to form a rotatable connection with the acetabular liner 120.

[0046] The above hip joint system 10 has an embedding groove 113 and at least two rotation grooves 114 formed in the cavity wall of the acetabular cup 110, and the boss 121 on the acetabular liner 120 can be embedded into any one of the rotation grooves 114 through the embedding groove 113. Since the depths of the rotation grooves 114 in the acetabular cup 110 are different, embedding the boss 121 into different rotation grooves 114 can change the relative position between the acetabular liner 120 and the acetabular cup 110, and changing the relative position between the acetabular liner 120 and the acetabular cup 110 can change the central position of the acetabular joint surface. Since the center of the femoral head coincides with the center of the acetabular joint surface, the central position of the femoral head can be adjusted by changing the central position of the acetabular joint surface. Therefore, according to the different central positions of the femoral heads 210 of different patients, the boss 121 can be embedded into the appropriate rotation groove 114, so as to ensure that the central position of the femoral head 210 of the hip joint system 10 is the same as the original femoral head center of the patient, making the eccentricity of the hip joint system 10 closer to the eccentricity of the patient himself, and improving the surgical effect. In other words, the above hip joint system 10 can be applied to patients with different eccentricities, improving the versatility of the hip joint system 10.

[0047] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0048] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. An acetabular prosthesis, characterized in that, comprising: an acetabular cup provided with a receiving cavity, the cavity wall of the receiving cavity being provided with a mounting groove, the mounting groove including an embedding groove extending along the depth direction of the receiving cavity and at least two rotating grooves spaced apart in the depth direction of the receiving cavity, the rotating grooves communicating with the embedding groove; an acetabular liner disposed in the receiving cavity, the acetabular liner being provided with a boss, the boss being capable of being embedded into any one of the rotating grooves through the embedding groove; each end of each rotating groove remote from the embedding groove having a clamping position, the boss being capable of being clamped with the clamping position; the acetabular prosthesis further includes a locking member, the acetabular cup being provided with an assembly groove penetrating through the cavity wall of the receiving cavity, the acetabular liner being provided with a locking groove, the assembly groove communicating with the locking groove, the locking member being disposed in the assembly groove and the locking groove to lock the acetabular cup and the acetabular liner; the number of the mounting grooves is at least two, at least two of the mounting grooves being spaced apart along the circumferential direction of the acetabular cup, the number of the bosses matching the number of the mounting grooves; the number of the locking grooves is at least two, at least two of the locking grooves being spaced apart in the height direction of the acetabular liner, the interval between two adjacent locking grooves being equal to the interval between two adjacent rotating grooves; the locking member is annular and has an opening.

2. The acetabular prosthesis according to claim 1, characterized in that, the number of the assembly grooves is at least two, at least two of the assembly grooves being spaced apart along the circumferential direction of the acetabular cup, the number of the locking members matching the number of the assembly grooves.

3. The acetabular prosthesis according to claim 1, characterized in that, the acetabular liner includes a first part made of a metal material and a second part made of a plastic material, the boss being disposed on the first part, and one end of the second part remote from the first part being provided with a joint surface for cooperating with a femoral head.

4. A hip joint system, characterized in that, comprising a femoral prosthesis and the acetabular prosthesis according to any one of claims 1-3 above, the femoral prosthesis being rotatably connected to the acetabular prosthesis.

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