Reconstruction structure used around acetabulum and based on gluteus column structure

Abstract

The invention discloses an acetabular periphery reconstruction device based on a gluteus column structure. The acetabular periphery reconstruction device is used for stably connecting and fixing an implanted acetabular cup. The device comprises a gluteus column fixing piece and an acetabular cup fixing piece, the gluteus column fixing piece is implanted into a gluteus column area above the acetabulum in a threaded mode, and a connecting face is arranged at the bottom of the gluteus column fixing piece and connected with the outer arc face of the acetabular cup fixing piece; the inner arc face of the acetabular cup fixing piece is connected with the acetabular cup, and therefore bridging and stable supporting are achieved. Through firm combination of the thread structure and the bone tissue, the device provides reliable mechanical stability. The geometric design of the acetabular cup fixing piece is highly matched with the structure of the acetabular cup, so that more uniform stress distribution can be realized; the inner surface of the acetabular cup is designed to be a non-smooth surface, and a bone cement filling space is reserved, so that the fixing effect of the acetabular cup is enhanced. The problem that the initial stability of the acetabular cup is insufficient in an existing revision operation is effectively solved, and a new structural supporting scheme is provided for acetabular reconstruction.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, and in particular relates to a reconstruction structure based on the gluteal column for the acetabulum, used for acetabular stabilization reconstruction in revision surgery of total hip arthroplasty. Background Technology

[0002] Total hip arthroplasty is a common treatment for hip joint diseases. However, with the increasing number of surgeries each year, the demand for acetabular revision surgery has risen significantly. Revision surgery is often accompanied by extensive osteolysis around the acetabulum, especially concentrated in the iliac region above and behind the acetabulum. Stable reconstruction in this area is crucial to ensuring initial fixation of the acetabular cup and long-term survival.

[0003] However, the iliac crest covers a large area, and there is currently no consensus on which specific region plays a core supporting role. Our study, combining imaging and biomechanical verification, found that the gluteal column, due to its unique anatomical location and mechanical properties, is a key load-bearing structure in acetabular revision surgery, and its integrity directly affects the stability of the acetabular cup and the lifespan of the prosthesis.

[0004] Commonly used reconstruction methods in existing technologies include reinforcement blocks, buttress plates, and wing-shaped cages, but all of them have shortcomings: The reinforcing block has poor fit with the bone defect and is difficult to provide effective initial stability. Buttress plates rely on iliac wing screws for fixation, which cannot resist longitudinal shear forces from the acetabular cup, resulting in a high early failure rate. Winged cages rely on morphological matching for fixation, resulting in poor compressive bonding, insufficient biological fixation, and limited long-term survival rates.

[0005] Therefore, there is an urgent need for an innovative reconstruction device that can provide stable support for the gluteal column region. Summary of the Invention

[0006] The technical objective of this invention is to provide a reconstruction structure based on the gluteal column structure for the periacetabulum, in order to solve the problem of acetabular cup fixation in the prior art.

[0007] To solve the above problems, the technical solution of the present invention is as follows: A reconstruction structure based on the gluteal column for the periacetabular region, used to connect and fix an implanted acetabular cup, comprising: The gluteal column fixation member is configured to be screwed into the gluteal column region above the acetabulum in a threaded manner, and the bottom of the gluteal column fixation member has a connecting surface. The acetabular cup fixation component includes an outer arc surface and an inner arc surface, the outer arc surface being... Connecting surfaces; The gluteal column fixation component and the acetabular cup fixation component work together to form a bridging structure to provide stable support for the acetabular cup; The peripheral bones of the gluteal column region are fixedly connected.

[0008] Specifically, the first radius of curvature of the acetabular cup fixation member on the coronal plane is greater than the radius of curvature corresponding to the maximum outer diameter of the acetabular cup on the coronal plane.

[0009] The second radius of curvature of the acetabular cup fixation member in the sagittal plane is greater than the radius of curvature corresponding to the maximum outer diameter of the acetabular cup in the sagittal plane. The gluteal column fixation member is inserted into the gluteal column region from above the hip bone. The insertion depth can be adjusted to accommodate acetabular cups of different diameters. The bottom of the gluteal column can extend into the acetabulum to provide support for the acetabular cup.

[0010] More preferably, the bottom of the gluteal column fixation member is also provided with an integrally formed base, which is connected to the outer arc surface of the acetabular cup fixation member and is configured to extend into the acetabulum and screw into the gluteal column area from bottom to top.

[0011] The gluteal column fixation component is made of titanium alloy or tantalum metal and has a porous structure to facilitate bone ingrowth and biological fixation.

[0012] The inner surface of the acetabular cup fixation component is non-smooth.

[0013] The inner surface of the acetabular cup fixation member and the acetabular cup have a space for bone cement strands to achieve a reliable fixation connection through bone cement.

[0014] The specifications of the gluteal column fixation component are matched with the size of the gluteal column area. The diameter of the gluteal column fixation component includes 6mm, 8mm, and 10mm, and the length is 5–15cm. The diameter of the acetabular cup fixation component is twice that of the gluteal column fixation component, and its radius of curvature corresponds to a circle with a diameter of 50–75mm.

[0015] Because the present invention adopts the above technical solution, it has the following advantages and positive effects compared with the prior art: This invention achieves a firm connection of the acetabular cup through the cooperation of the gluteal column fixation component and the acetabular cup fixation component. The gluteal column fixation component is screwed into the gluteal column area above the acetabulum, and its threaded structure is fixedly connected to the bone, providing strong mechanical stability.

[0016] The first radius of curvature of the acetabular cup fixation in the coronal plane is greater than the radius of curvature corresponding to the maximum outer diameter of the acetabular cup in the coronal plane, and the second radius of curvature in the sagittal plane is greater than the radius of curvature corresponding to the maximum outer diameter of the acetabular cup in the sagittal plane. This allows the acetabular cup fixation to better conform to the anatomical structure of the acetabulum and provide more uniform mechanical support.

[0017] A space for bone cement loops is left between the inner surface of the acetabular cup fixation member and the acetabular cup. The fixation is achieved by filling the space with bone cement. This provides point contact and support for the acetabular cup, leaving space for the bone cement loops while avoiding obstruction of the cup, thus maximizing support effectiveness. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention.

[0019] Figure 1 This is a schematic diagram of a reconstruction structure for the periacetabulum based on the gluteal column structure according to the present invention; Figure 2 This is an enlarged schematic diagram of the gluteal column fixation member of the present invention.

[0020] Explanation of reference numerals in the attached figures 1: Gluteal column fixation component; 101: Base; 102: Threaded structure; 2: Acetabular cup fixation component. Detailed Implementation

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0022] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0023] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a reconstruction structure for the periacetabulum based on the gluteal column structure proposed in this invention. The advantages and features of this invention will become clearer from the following description and claims.

[0024] Example See Figure 1 This embodiment provides a reconstruction structure for the periacetabulum based on the gluteal column structure for connecting and fixing the implanted acetabular cup, including: gluteal column fixation member 1 and acetabular cup fixation member 2.

[0025] In this embodiment, the gluteal column fixation member 1 is screwed into the gluteal column region above the acetabulum. Its bottom is a connecting surface, which connects to the outer arc surface of the acetabular cup fixation member 2. The inner arc surface of the acetabular cup fixation member 2 is fixedly connected to the acetabular cup to be implanted, thereby bridging the gluteal column and the acetabular cup and bearing and transmitting the compressive stress from the acetabular cup. The periphery of the gluteal column fixation member 1 has a threaded structure 102, which allows it to be screwed into the gluteal column region and fixedly connected to the peripheral bones of the gluteal column region.

[0026] In practice, the gluteal column fixation piece 1 is screwed into the gluteal column area from above the hip bone until the bottom of the gluteal column fixation piece is positioned to provide support for the acetabular cup placed inside the acetabular cup fixation piece.

[0027] Furthermore, the bottom of the gluteal column fixation member 1 is also provided with an integrally formed base 101, the bottom of which is connected to the outer arc surface of the acetabular cup fixation member 2. When the base 101 is provided, in specific implementation, the top of the gluteal column fixation member 1 is inserted into the acetabulum and screwed into the gluteal column area from bottom to top until the base 101 is in a position that can provide support for the acetabular cup placed in the acetabular cup fixation member.

[0028] Among them, the gluteal column fixation component 1 is made of titanium alloy or tantalum metal material and has a porous structure, which is conducive to bone ingrowth and long-term biological fixation.

[0029] Specifically, the acetabular cup fixation member 2 is generally spherical in shape. In order to ensure that the highest point of the acetabular cup and the inner arc surface of the acetabular cup fixation member 2 always maintain point contact, the first radius of curvature of the acetabular cup fixation member 2 in the coronal plane is greater than the radius of curvature corresponding to the maximum outer diameter of the acetabular cup in the coronal plane. Moreover, the second radius of curvature of the acetabular cup fixation member 2 in the sagittal plane is greater than the radius of curvature corresponding to the maximum outer diameter of the acetabular cup in the sagittal plane.

[0030] The principle is as follows: If the first radius of curvature of the coronal plane of the acetabular cup fixation member 2 is too small, during the press-fitting of the acetabular cup, the two contact points of the outer diameter of the acetabular cup will contact the side of the acetabular cup fixation member 2, resulting in a gap between the highest point of the acetabular cup and the acetabular cup fixation member 2, making axial press-fitting impossible and thus easily lacking stability. When the second radius of curvature of the acetabular cup fixation member 2 in the sagittal plane is large, during the press-fitting process, the acetabular cup will be press-fitted along the outer edge of the inner surface of the acetabular cup fixation member 2 to its middle part, that is, the highest point of the maximum cross-sectional radius of the acetabular cup contacts the middle part of the inner surface of the acetabular cup fixation member 2, forming initial stability.

[0031] Furthermore, to facilitate fixation, the inner surface of the acetabular cup fixation member 2 is non-smooth, allowing the acetabular cup to achieve point contact and support with its inner surface during installation. Additionally, a bone cement loop space is provided between the inner surface of the acetabular cup fixation member 2 and the acetabular cup, and bone cement is filled into this space to achieve a fixed connection between the acetabular cup fixation member 2 and the acetabular cup.

[0032] Specifically, the product specifications of this embodiment are illustrated below: the specifications of the gluteal column fixation component 1 should match the size of the gluteal column area, and the specifications of the acetabular cup fixation component 2 should match the specifications of the acetabular cup to be implanted; the diameter of the gluteal column fixation component 1 includes specifications of 6mm, 8mm, and 10mm, and the length of the gluteal column fixation component 1 includes specifications of 5cm, 6cm, 7cm, 8cm, 9cm, 10cm, 11cm, 12cm, 13cm, 14cm, and 15cm; the diameter of the acetabular cup fixation component 2 is twice the diameter of the gluteal column fixation component 1 connected to it, and the curvature of the acetabular cup fixation component 2 includes the curvature corresponding to circles with diameters of 50, 55, 60, 65, 70, and 75mm.

[0033] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A reconstruction structure for the periacetabular region based on the structure of the ischiatic columns for connecting and fixing an implanted acetabular cup, characterized in that, Comprise: a gluteal muscle column fixing member configured to be screwed into the gluteal muscle column area above the acetabulum in a threaded manner, the bottom of the gluteal muscle column fixing member being provided with a connecting surface; an acetabular cup fixing member comprising an outer arc surface and an inner arc surface, the outer arc surface being connected to the connecting surface; the gluteal muscle column fixing member and the acetabular cup fixing member cooperate to form a bridging structure for providing stable support for the acetabular cup.

2. According to claim 1, the peripheral side of the gluteal muscle column fixing member is a threaded structure, and the peripheral side of the gluteal muscle column area is fixedly connected to the bone.

3. The structures based on the structures of the obturator pillar for reconstruction around the acetabulum according to claim 1, characterized in that, The first curvature radius of the acetabular cup fixing member in the coronal plane is greater than the curvature radius corresponding to the maximum outer diameter of the acetabular cup in the coronal plane.

4. The structures based on the structures of the obturator internus muscle column for reconstruction around the acetabulum according to claim 1, characterized in that, The second curvature radius of the acetabular cup fixing member in the sagittal plane is greater than the curvature radius corresponding to the maximum outer diameter of the acetabular cup in the sagittal plane.

5. The structures based on the structures of the obturator internus muscle column for reconstruction around the acetabulum according to claim 1, characterized in that, The gluteal muscle column fixing member is implanted into the gluteal muscle column area above the hip bone, and the depth of screwing is adjusted to adapt to different diameters of the acetabular cup, and the bottom of the gluteal muscle column can extend into the acetabulum to provide support for the acetabular cup.

6. The structures based on the structures of the obturator internus muscle column for reconstruction around the acetabulum according to claim 1, characterized in that, The bottom of the gluteal muscle column fixing member is further provided with an integrally formed base, and the base is connected to the outer arc surface of the acetabular cup fixing member and is configured to extend into the acetabulum and be screwed into the gluteal muscle column area from bottom to top.

7. The structures based on the structures of the obturator internus muscle column for reconstruction around the acetabulum according to claim 1, characterized in that, The gluteal muscle column fixing member is made of titanium alloy or tantalum metal material and has a porous structure to facilitate bone ingrowth and biological fixation.

8. The structures based on the structures of the obturator internus muscle column for reconstruction around the acetabulum according to claim 1, characterized in that, The inner surface of the acetabular cup fixing member is a non-smooth surface.

9. The structures based on the structures of the obturator internus muscle column for reconstruction around the acetabulum according to claim 1, characterized in that, The inner surface of the acetabular cup fixing member and the acetabular cup leave a bone cement cable space to achieve reliable fixed connection through bone cement.

10. The structures based on the structures of the obturator internus muscle column for reconstruction around the acetabulum according to claim 1, characterized in that, The specifications of the gluteal muscle column fixing member match the size of the gluteal muscle column area, and the diameter of the gluteal muscle column fixing member includes 6mm, 8mm, and 10mm, and the length is 5-15cm; the diameter of the acetabular cup fixing member is twice the diameter of the gluteal muscle column fixing member, and the curvature radius corresponds to a circle with a diameter of 50-75mm.

Images