Interspinous Implant Flange Load Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing implant devices for interspinous distraction in spinal stenosis treatment often lead to continued degeneration of spinous processes, particularly in patients with osteoporosis, and have a high failure rate for lumbar spinal stenosis caused by degenerative spondylolisthesis, as they concentrate load on non-load-bearing interspinous surfaces.
Innovation Solution
An implant device with a narrow midsection and wider, flange-shaped outer sections that can be tightened to bear against thicker bony portions of the spinous processes, optionally equipped with pins to increase load-bearing potential and stabilize the joint, thereby distributing the load and preventing further dislocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the implant device bears load on the interspinous surfaces, then interspinous distraction is achieved, but the spinous processes continue to degenerate
Solution Approach 1:
The patent introduces thicker bony portions of the spinous processes as intermediary load-bearing structures. The implant device is designed to transfer loads from the interspinous surfaces to these stronger bony portions, which are better equipped to handle mechanical stresses without degenerating. This mediator approach protects the vulnerable interspinous surfaces while maintaining distraction stability.
Solution Approach 2:
The patent applies local quality by concentrating load-bearing functions in specific regions (thicker bony portions) rather than distributing loads uniformly across the entire spinous process. The implant device is configured to engage specifically with these stronger local regions, allowing those areas to bear the mechanical loads while protecting the more fragile interspinous surfaces.
2Reliability
If the implant device is designed with wider flange-shaped outer sections to bear against thicker bony portions, then load distribution is improved, but device complexity increases
Solution Approach 1:
The implant device is segmented into distinct functional regions: a narrow midsection for fitting between spinous processes and wider flange-shaped outer sections for bearing against thicker bony portions. This segmentation allows each part to perform its specific function optimally while keeping the overall design relatively simple and modular.
Solution Approach 2:
The patent transitions from a simple linear implant structure to a multi-dimensional structure with varying cross-sectional dimensions. The flange-shaped outer sections extend in the lateral dimension to contact the thicker bony portions, creating a more complex spatial configuration that enables improved load-bearing capacity without significantly increasing overall device complexity.
3Reliability
If pins are added to penetrate and engage the thicker bony portions, then load-bearing potential is increased, but device complexity and surgical difficulty increase
Solution Approach 1:
The patent merges the pin fixation mechanism with the flange-shaped outer sections. The pins are integrated into the flange structure, allowing them to penetrate and engage the thicker bony portions while being part of the same structural element. This merging reduces the number of separate components and simplifies both the device design and surgical implantation process.
Data Source
AI summary
Improved implant devices and methods for interspinous distraction distribute the load of interspinous distraction so that the entire load is not bearing on the interspinous surfaces. The implant device has a narrow midsection and two wider, flange-shaped outer sections. The wider, flange-shaped outer sections can be tightened to bear against the thicker bony portions of the spinous processes to support some of the load. Optionally, the wider, flange-shaped outer sections can be configured with pins that will penetrate and engage the thicker bony portions of the spinous processes, which will increase the load bearing potential of the wider, flange-shaped outer sections. Additionally, the wider, flange-shaped outer sections and the pins will help to stabilize the joint. The joint stabilization may help to prevent further dislocation of the vertebra that occurs with spondylolisthesis.