Lumbar artificial lamina

Abstract

The utility model discloses a lumbar artificial lamella, including the board body and being located at the self -locking type panel structure of board body two sides, the board body has the gradient porosity structure along the thickness direction distribution, and the gradient porosity structure includes at least surface layer function layer and inner layer bearing layer, and the porosity of surface layer function layer is greater than the porosity of inner layer bearing layer. Its structure is reliable, and the gradient porosity structure realizes the gradient transition of mechanical properties through the cooperation of surface layer high porosity and inner layer high -strength crystal lattice, avoids the stress shielding effect of traditional rigid uniform structure, and the self -locking type panel system forms stable self -locking structure through the inclination cooperation, replaces traditional screw fixed mode, improves the pull -out force, and improves the structural stability after implantation, in addition, through the synergistic innovation of gradient porosity structure design, dynamic dissection adaptation and self -locking type fixed system, realize the accurate matching of structure and anatomical feature and the optimization balance of mechanical properties, and improve postoperative implantation stability and bone integration effect.

Description

Technical Field

[0001] This utility model relates to the field of orthopedic implant medical device technology, specifically to an artificial lumbar vertebral lamina. Background Technology

[0002] As a key reconstructive implant after laminectomy in spinal surgery, the lumbar artificial lamina plays a crucial role in providing mechanical support, promoting osseointegration, and preventing dural adhesions. The rationality of its structural design directly determines the compatibility of the implant with the human anatomy and the stability of mechanical transmission. However, existing technologies suffer from significant homogenization in structural design, severely limiting clinical application outcomes and patient prognosis.

[0003] Current artificial vertebral laminae generally employ standardized, integrated fixation structures, which suffer from a significant problem of insufficient curvature adaptability. For example, the structure disclosed in patent US20200155321A1 has a preset curvature range of only 90°-120°, while clinical data shows that the actual anatomical parameters of the lumbar spine in patients range from pedicle distance D to 30-45 mm and radius of curvature R to 15-25 mm. There is a significant deviation between the standardized curvature and individual anatomical characteristics. Finite element analysis confirms that for every 1° increase in curvature error, the stress concentration index (SCI) increases by 0.3. When the SCI exceeds 1.5, the incidence of adjacent segment degeneration increases fourfold, easily leading to postoperative complications such as lower back pain and limited mobility.

[0004] Furthermore, the existing fixation methods and overall morphological design lack coordination, and the standardized dimensions do not adequately fit the bone surface, further exacerbating stress concentration and insufficient fixation stability. Therefore, developing an artificial lamina that combines personalized matching features with optimized mechanical properties to address the structural deficiencies in anatomical fit and mechanical balance has become an urgent need in the field of spinal surgical implants. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an artificial lumbar vertebral lamina.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a lumbar artificial vertebral plate, including a plate body and a self-locking insert structure disposed on both sides of the plate body. The plate body has a gradient porosity structure distributed along the thickness direction. The gradient porosity structure includes at least a surface functional layer and an inner bearing layer. The porosity of the surface functional layer is greater than that of the inner bearing layer.

[0007] Furthermore, the self-locking panel structure includes an L-shaped panel and a U-shaped panel, with the L-shaped panel and the U-shaped panel forming a self-locking angle through their respective tilt angles.

[0008] Furthermore, the self-locking angle is formed by the superposition of the tilt angle of the L-shaped panel and the tilt angle of the U-shaped panel.

[0009] Furthermore, the plate body is an I-beam structure, with a gradient pore structure extending through the thickness of the I-beam.

[0010] Furthermore, the surface functional layer adopts a dodecahedral lattice structure with a pore connectivity of ≥95%.

[0011] Furthermore, the inner support layer adopts a body-centered cubic lattice structure.

[0012] Furthermore, the outer surface of the plate is coated with a bioactive coating.

[0013] The present invention has the following beneficial effects: The lumbar artificial vertebral lamina provided by the present invention has a reliable structure. The gradient porosity structure achieves a gradient transition of mechanical properties through the synergy of the high porosity of the surface layer and the high strength of the inner layer, avoiding the stress shielding effect of the traditional rigid and uniform structure. The self-locking plate system forms a stable self-locking structure through the tilt angle, replacing the traditional screw fixation method, improving the pull-out resistance and the structural stability after implantation. In addition, the highly interconnected porosity structure of the surface functional layer and the bioactive coating work synergistically to significantly accelerate osteoblast migration and blood vessel ingrowth, improving the postoperative implantation stability and bone integration effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the present invention; Figures 1 to 2 The reference numerals in the accompanying drawings are respectively: 1-plate body, 20-L-shaped panel, 21-U-shaped panel. Detailed Implementation

[0015] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0016] like Figures 1 to 2 As shown, an artificial lumbar vertebral laminae includes a laminae body 1 and self-locking insert structures disposed on both sides of the laminae body 1. The laminae body 1 has a gradient porosity structure distributed along the thickness direction. The gradient porosity structure includes at least a surface functional layer and an inner bearing layer. The porosity of the surface functional layer is greater than that of the inner bearing layer.

[0017] Plate 1 is the main structure of the lumbar artificial vertebral lamina, serving both mechanical support and biocompatibility. A gradient porosity structure runs through the thickness of the plate, creating seamless communication channels between the surface functional layer (high porosity, interconnected lattice) and the inner support layer (low porosity, high-strength lattice). Osteoblasts can enter the implant from the bone surface through the surface pores and then penetrate to the junction between the inner and surface layers via the through-channels, ultimately forming a three-dimensional integrated network of vascularization and ossification within the implant. Furthermore, the outer surface of Plate 1 is coated with a bioactive layer of hydroxyapatite (HA) / collagen. This "inorganic-organic composite structure" forms chemical bonds (such as hydroxyl bonds and ionic bonds) with calcium and phosphate ions on the bone tissue surface, achieving chemical adhesion between the implant and bone tissue, rather than simple mechanical contact, thus laying a chemical foundation for osseointegration.

[0018] The surface functional layer is located on the outer layer of the plate 1 near the bone surface and is a key functional area for achieving bone integration. The surface functional layer adopts a dodecahedral lattice structure with a porosity of ≥95%, which provides a three-dimensional channel for osteoblast migration and vascular endothelial cell proliferation. The high porosity (higher than the inner layer) and connectivity of the dodecahedral lattice structure can construct a continuous cell growth space, breaking the limitation of traditional dense or low porosity structures on bone ingrowth and directly promoting the biological connection between bone tissue and implant.

[0019] The inner bearing layer is located inside the plate 1 and is the mechanical core that bears the physiological load of the lumbar spine. The inner bearing layer adopts a body-centered cubic lattice structure, which provides stable structural support and resists the axial compression and bending stresses borne by the lumbar spine during human standing, bending and other movements. The low porosity and high strength lattice structure (such as body-centered cubic lattice) can ensure sufficient yield strength and avoid deformation or breakage of the implant. At the same time, the gradient design connects to the surface layer to achieve a smooth transition between mechanical properties and biological functions.

[0020] The self-locking insert structure located on both sides of the plate 1 is a key component for reliably fixing the implant to the lumbar vertebral bone tissue, replacing traditional screw fixation. In this embodiment, the self-locking insert structure includes an L-shaped insert 20 and a U-shaped insert 21. The L-shaped insert 20 and the U-shaped insert 21 form a self-locking angle through their respective tilt angles. The self-locking angle is formed by the superposition of the tilt angles of the L-shaped insert 20 and the U-shaped insert 21. The L-shaped insert 20, as an active fitting component, can precisely fit with the U-shaped insert 21 at a specific tilt angle (e.g., 15°). During implantation, it achieves initial positioning by conforming to the anatomical contour of the pedicle or articular process, while providing an active tilt angle basis for the formation of the self-locking angle. As a passive fitting component, the U-shaped insert 21 has an inclination angle (e.g., 25°) that overlaps with the inclination angle of the L-shaped insert 20 to form a self-locking angle (e.g., 40°). After fitting, it can "lock" the anatomical structure through friction with the bone surface, resisting pull-out force without the need for additional screws. This simplifies the surgical procedure and avoids bone damage caused by screw fixation.

[0021] Additionally, it should be noted that components not described in detail in this article are existing technologies.

[0022] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lumbar artificial vertebral laminar plate, characterized in that, The plate includes a plate (1) and a self-locking panel structure disposed on both sides of the plate (1). The plate (1) has a gradient porosity structure distributed along the thickness direction. The gradient porosity structure includes at least a surface functional layer and an inner bearing layer. The porosity of the surface functional layer is greater than that of the inner bearing layer.

2. The lumbar artificial vertebral laminar plate according to claim 1, characterized in that, The self-locking panel structure includes an L-shaped panel (20) and a U-shaped panel (21), wherein the L-shaped panel (20) and the U-shaped panel (21) form a self-locking angle through their respective tilt angles.

3. The lumbar artificial vertebral laminae according to claim 2, characterized in that, The self-locking angle is formed by the superposition of the tilt angle of the L-shaped panel (20) and the tilt angle of the U-shaped panel (21).

4. The lumbar artificial vertebral laminae according to claim 1, characterized in that, The plate (1) is an I-beam structure, and the gradient pore structure is provided through the thickness direction of the I-beam.

5. The lumbar artificial vertebral laminar plate according to claim 1, characterized in that, The surface functional layer adopts a dodecahedral lattice structure and has a pore connectivity of ≥95%.

6. The lumbar artificial vertebral laminae according to claim 1, characterized in that, The inner bearing layer adopts a body-centered cubic lattice structure.

7. The lumbar artificial vertebral laminae according to claim 1, characterized in that, The outer surface of the plate (1) is provided with a bioactive coating.

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