Lamina Reinforcement Implant with Cantilever Bridge and Anchoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing reinforcement implants for the lamina after laminectomy lack stability and ease of use due to the need for multiple sizes and difficulty in handling uneven resection surfaces, leading to compromised pressure transmission and increased complexity.
Innovation Solution
A reinforcement implant with a cantilever part and anchoring parts oriented at an obtuse angle, featuring a shear stop device and adjustable fastening pins, allowing secure and constraint-free mounting that maintains natural bone elasticity and avoids degeneration, and can be easily implanted without direct contact with resection surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple sizes of reinforcement implants are provided to fill the resected area completely, then the pressure transmission function is improved, but the device complexity increases considerably
Solution Approach 1:
The reinforcement implant is designed with a universal geometry that can accommodate various resection sizes through a single size class. The implant features a broad bearing surface with a curved configuration that adapts to different anatomical variations, eliminating the need for multiple size variants while maintaining effective pressure transmission across the resected area.
Solution Approach 2:
The implant design incorporates adjustable parameters such as the curvature radius and surface area dimensions that can be modified within a single implant design to match different resection sizes. This allows one implant type to serve multiple size requirements through parameter variation rather than requiring completely different implant sizes.
2Manufacturing precision
If the filler material is designed to lie flat against the cut surfaces of the lamina, then the pressure transmission is improved, but the ease of operation deteriorates when cut surfaces are not flat
Solution Approach 1:
The implant features a curved bearing surface with a specific radius of curvature that allows it to conform to the natural anatomy of the lamina cut surfaces. This curved geometry enables the implant to make contact with uneven surfaces while maintaining adequate pressure transmission, eliminating the need for perfectly flat cut surfaces.
Solution Approach 2:
The implant design incorporates a curved surface with optimized radius parameters that allow adaptation to varying degrees of surface irregularity. By changing the curvature parameters of the bearing surface, the implant can maintain effective contact and pressure transmission even when the underlying bone surfaces are not perfectly flat.
3Stability of the object's composition
If the implant is designed to bridge the resected part with anchoring elements, then the stability is improved, but the device complexity increases
Solution Approach 1:
The implant employs asymmetric anchoring configurations where anchoring elements are positioned at specific locations and orientations optimized for the particular resection pattern. This asymmetric design provides enhanced stability by targeting specific anatomical features while avoiding the need for symmetric, multi-directional anchoring systems that would increase complexity.
Solution Approach 2:
The implant design incorporates localized anchoring features at specific positions rather than uniform distribution. The anchoring elements are strategically placed at locations providing maximum mechanical advantage and stability for the specific resection scenario, optimizing performance without requiring complex multi-point anchoring systems throughout the entire implant structure.
Data Source
Figure 1~2b
Figure 3
Figure 4a~5b
AI summary
The invention relates to a reinforcement implant for insertion into the lamina (91) of a vertebra (9), comprising a main body with bearing surfaces on the vertebra and a fastening device. According to the invention, a cantilever part (2) for spanning a resected area (92) of the lamina (91) is provided, and also, at opposite ends of the bridge part, in each case an anchoring part, wherein a first anchoring part is designed with a pressure surface (30) for bearing on the spinous process (90) of the vertebra (9), and a second anchoring part is designed with a transverse thrust surface (40) for bearing on an outer face of the lamina (91). The pressure surface (30) and the transverse thrust surface (40) enclose an obtuse angle (alpha), wherein an anti-shear device (5), in particular a facet screw (50), is arranged on the transverse thrust surface (40), and one edge of the transverse thrust surface (40) is adjoined by a load-bearing area (20) of the cantilever part (2) for spanning the resected area (92) of the lamina (91).