Standalone Interbody Implant with Metal Inserts for Spinal Fusion
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Solution Overview
Problem
Current spinal fixation devices, particularly those using non-metallic materials like PEEK, lack sufficient strength to support fixation elements effectively, and their anterior profile can obstruct anatomical structures during direct anterior approaches, necessitating a solution that provides additional support and minimizes profile protrusion.
Innovation Solution
The development of stand-alone interbody fusion implants comprising a spacer with integrated inserts or members that enhance strength and stability, featuring apertures for fixation elements like screws, and a design that minimizes anterior profile protrusion, utilizing materials such as titanium to emulate the elasticity of bone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-metallic materials like PEEK are used for the spacer, then the spacer provides adequate flexibility and biocompatibility, but the spacer lacks sufficient strength to support fixation elements effectively
Solution Approach 1:
The patent employs composite construction by integrating metal inserts (titanium or stainless steel) within the non-metallic spacer body (PEEK). This composite approach combines the biocompatibility and flexibility of PEEK with the high strength and stiffness of metal materials, allowing the spacer to both support fixation elements effectively and maintain operational flexibility.
Solution Approach 2:
The spacer is divided into distinct functional zones: a non-metallic body providing flexibility and biocompatibility, and integrated metal inserts providing localized strength for fixation element support. This segmentation allows each material to perform its optimal function without compromising the other.
2Reliability
If a plate is positioned on the anterior portions of the adjacent vertebral bodies for fixation, then additional fixation and stabilization is provided, but the profile of the plate becomes obstructive to the anatomy and requires navigation or dissection of vascular anatomy
Solution Approach 1:
The patent merges the spacer and fixation elements into a single integrated device. The fixation elements (screws, staples, pins, or nails) are incorporated directly into the spacer structure, eliminating the need for separate anterior plating. This integration maintains reliable fixation while removing the obstructive anterior profile and associated surgical risks.
Solution Approach 2:
The fixation mechanism transitions from an anterior approach (requiring plate placement on front surfaces) to a posterior or lateral approach where fixation elements are introduced through the spacer structure itself. This dimensional shift in fixation strategy avoids anatomical obstructions in the anterior region.
3Ease of operation
If the spacer is made solely from non-metallic materials, then the spacer provides flexibility and biocompatibility, but the spacer alone may not be strong enough to support fixation elements
Solution Approach 1:
The patent uses composite materials by embedding metal reinforcement elements (titanium or stainless steel inserts) within the non-metallic PEEK spacer. This composite structure provides the flexibility and biocompatibility of PEEK while the metal inserts contribute the necessary strength and stiffness to support fixation elements.
Solution Approach 2:
The spacer exhibits local quality variation: the bulk PEEK material provides flexibility and biocompatibility in regions where these properties are needed, while localized metal inserts provide enhanced strength specifically at regions where fixation elements require support.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These implants provide effective stabilization and fusion of adjacent vertebrae while reducing the risk of anatomical obstruction, offering a strong and stable solution for spinal fixation with a low or zero profile design.
Implementation Method 1
The opening may be configured for receiving bone graft material to promote fusion of the adjacent vertebral bodies
Implementation Method 2
The spacer may also include a plurality of protrusions on the contact areas of the superior and inferior surfaces for engaging the adjacent vertebrae
Implementation Method 3
utilizing materials such as titanium to emulate the elasticity of bone
Data Source
AI summary
Stand-alone interbody fusion devices for engagement between adjacent vertebrae. The stand-alone interbody fusion devices may include a spacer and one or more inserts or members coupled to the spacer. The inserts or members may be configured and designed to provide the apertures which are designed to retain bone fasteners, such as screws, and secure the implant to the adjacent vertebrae.