Intervertebral Spacer Anchoring Mechanism for Spinal Fusion
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Solution Overview
Problem
Current methods for stabilizing adjacent vertebras during intervertebral spinal fusion, such as using pedicle screws and rods, are time-consuming and require large incisions, and existing spacers may still move due to stress, necessitating a more effective and efficient stabilization technique.
Innovation Solution
A spacer with upper and lower guides that deploy upper and lower anchors simultaneously into the vertebral bodies, providing additional stabilization through the combination of anchor penetration and surface protrusions, allowing for secure anchorage without extensive surgical incisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pedicle screws and rods are used to stabilize adjacent vertebras, then stabilization strength is improved, but surgical time and incision size increase
Solution Approach 1:
The patent combines multiple anchoring functions into a single integrated anchoring device that simultaneously provides superior and inferior anchorage. The device merges the functions of multiple pedicle screws into one unitary structure that can be implanted through a single incision, thereby reducing surgical time while maintaining stabilization strength.
Solution Approach 2:
The anchoring device is segmented into distinct superior and inferior anchors with different geometric configurations. The superior anchor features flares and hooks optimized for engagement with the superior vertebral body, while the inferior anchor has complementary features for the inferior vertebral body. This segmentation allows each portion to be optimized for its specific function while being deployed as a single integrated device.
2Strength
If pedicle screws and rods are used to stabilize adjacent vertebras, then stabilization strength is improved, but incision size increases
Solution Approach 1:
The patent combines multiple anchoring functions into a single integrated anchoring device that simultaneously provides superior and inferior anchorage. The device merges the functions of multiple pedicle screws into one unitary structure that can be implanted through a single incision, thereby reducing surgical time while maintaining stabilization strength.
3Device complexity
If spacers are stabilized with protrusions only, then device complexity is reduced, but stability deteriorates under stress
Solution Approach 1:
The anchoring device is segmented into distinct superior and inferior anchors with different geometric configurations. The superior anchor features flares and hooks optimized for engagement with the superior vertebral body, while the inferior anchor has complementary features for the inferior vertebral body. This segmentation allows each portion to be optimized for its specific function while being deployed as a single integrated device.
Solution Approach 2:
The anchoring device exhibits local quality through its differentiated superior and inferior anchors. Each anchor portion has specific geometric features tailored to its location: the superior anchor has flares and hooks for superior vertebral engagement, while the inferior anchor has corresponding features for inferior vertebral engagement. This localized optimization enhances overall spacer stability without requiring excessive complexity.
Data Source
AI summary
A device and methods for intervertebral spinal fusion of adjacent intervertebral bodies. An intervertebral spacer is positioned within a narrow disc space between adjacent intervertebral bodies of a patient. The spacer is arranged with upper and lower guides. The guides are adapted to simultaneously guide the deployment of upper and lower anchors of an anchoring device into their respective intervertebral bodies. The spacer is also adapted to lock the upper and lower anchors to the spacer in the deployed position.