Spinal Interbody Device Load Arrangement for Bone Fusion
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Solution Overview
Problem
Current spinal fusion devices lack effective mechanisms to promote mechanical stability and accelerate bone fusion between vertebral bodies, often resulting in delayed or incomplete fusion due to inadequate load distribution and graft integration.
Innovation Solution
A device with a load arrangement comprising protrusions, plates, or elongate elements that apply directed force to graft material within an interior cavity, enhancing bone remodeling and integration by distributing load symmetrically and resisting torsional forces, potentially using degradable materials to facilitate healing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional interbody devices are used without load arrangements, then the device structure is simple, but bone fusion is delayed or incomplete due to inadequate load distribution
Solution Approach 1:
The device is segmented into functional zones: an interior cavity for graft material and exterior walls for structural support. The load arrangement is further segmented into multiple protrusions or plates distributed within the cavity, each contributing to load distribution. This segmentation allows the device to achieve reliable bone fusion through improved load management while maintaining a manageable structural complexity through modular design.
Solution Approach 2:
The load arrangement introduces dynamic load distribution capabilities to the device. The protrusions or plates can deform or adjust under load, enabling the device to adapt to varying mechanical conditions during the fusion process. This dynamic behavior enhances fusion reliability by optimizing stress distribution on the graft material throughout healing, while the dynamic nature is achieved through relatively simple geometric features rather than complex mechanisms.
2Strength
If graft material is deposited in the cavity without load arrangement, then the device is easier to manufacture, but mechanical stability is insufficient leading to graft subsidence
Solution Approach 1:
Rather than uniformly strengthening the entire device, the load arrangement applies local quality enhancement through strategically positioned protrusions or plates within the cavity. These localized features concentrate load-bearing capacity where it is most needed - on the graft material - while leaving other portions of the device simpler in structure. This approach achieves improved mechanical stability without proportionally increasing manufacturing complexity, as the load-bearing elements are integrated into the existing device geometry.
3Productivity
If the device uses simple cavity structure, then manufacturing is easier, but load transfer between spinal segments is inadequate slowing fusion rate
Solution Approach 1:
The load arrangement extends the functional capability of the device into a new dimension - the internal load distribution dimension. By adding protrusions or plates that extend inwardly from the walls into the cavity, the device creates multiple load transfer pathways within the graft material volume. This dimensional enhancement accelerates fusion by improving load transfer efficiency, while the added complexity remains relatively modest as it involves extending existing wall structures inward rather than adding entirely separate components.
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
The device promotes faster and more stable bone fusion by improving load transfer and distribution, reducing graft subsidence, and enhancing biological activity, leading to earlier spinal stability and more robust fusion outcomes compared to conventional interbody devices.
Implementation Method 1
a load arrangement associated with the device, extending generally inwardly from a device wall into the cavity to load material deposited within the cavity of the device
Implementation Method 2
In some forms the elongate member comprises a spring
Data Source
AI summary
A device adapted to be positioned between two bone regions, the device comprising at least one wall defining at least one interior cavity, and, a load arrangement extending from the wall and comprising at least one interacting feature configured to load material positioned within the cavity by interacting with either a second interacting feature or the wall.