Spinal Implant Polyaxial End Plate Spheroidality
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Solution Overview
Problem
Existing spinal implants cannot adapt to the natural curvature of the spine, limiting their effectiveness in restoring stability and compatibility with individual patient anatomy.
Innovation Solution
A rotationally symmetrical recess in the end plate allows for polyaxial movement relative to the implant part, enabling adjustable rotation around different axes and automatic angle adjustment, with a slot for detachable connection and reduced component complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hinge-like connection with a fixed pivot axis is used between the implant part and end plate, then the implant can be assembled, but it cannot adapt to the natural curvature of the spine
Solution Approach 1:
The patent employs a rotationally symmetrical recess with a spherical geometry that allows the end plate to pivot around multiple axes rather than a fixed linear axis. This spherical articulation enables the implant to adapt to the natural curvatures of the spine in multiple planes, resolving the contradiction between adaptability and complexity by using a geometric form that inherently provides multi-directional movement capability.
Solution Approach 2:
The connection between the end plate and implant part is designed to be dynamically adjustable rather than statically fixed. The rotationally symmetrical recess allows the end plate to achieve different angular positions and orientations depending on the spinal curvature requirements, enabling the implant to adapt dynamically to various anatomical conditions without requiring multiple pre-configured components.
2Adaptability or versatility
If multiple implant variants with different angles are provided to cover various spinal curvatures, then adaptability is improved, but device complexity and storage requirements increase
Solution Approach 1:
The implant design achieves universality by incorporating a rotationally symmetrical recess that can accommodate end plates at multiple angles and orientations. Instead of requiring separate implant variants for different spinal curvatures, this single design can be configured to match various anatomical requirements through the adjustable pivoting mechanism, thereby reducing the number of components needed while maintaining comprehensive adaptability.
Solution Approach 2:
The implant allows for parameter changes in the angular orientation of the end plate relative to the implant part. By enabling continuous adjustment of the pivoting angle within the rotationally symmetrical recess, the system can adapt to different spinal curvature parameters without requiring discrete variants for each angle, thus simplifying the component inventory while maintaining versatility.
3Adaptability or versatility
If a rotationally symmetrical recess with polyaxial movement is implemented, then adaptability to patient-specific curvatures is improved, but the connection complexity between end plate and implant part increases
Solution Approach 1:
The rotationally symmetrical recess utilizes spherical geometry to enable polyaxial movement. The spherical articulation surface allows the end plate to pivot around multiple axes intersecting at the center of the sphere, providing adaptability in all directions while maintaining a relatively simple connection mechanism based on fundamental geometric principles rather than complex mechanical linkages.
4Stability of the object's composition
If the end plate is rigidly fixed to the implant part, then structural stability is improved, but the ability to adapt to individual patient anatomy is lost
Solution Approach 1:
The connection between the end plate and implant part is designed as a dynamic system that allows controlled movement and adjustment. The rotationally symmetrical recess enables the end plate to pivot and adapt to the patient's anatomy during implantation, while once positioned, the structure provides sufficient stability to maintain the desired configuration under physiological loads, thus balancing adaptability and stability.
Data Source
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AI summary
The invention relates to an implant for insertion between vertebral bodies, comprising an implant part (2) which has an end plate (4) on at least one of the free ends. On the side facing the implant part (2), a rotation-symmetrical recess (5) is designed in the end plate (4), with the recess being guided by the side wall (8) thereof on an annular collar (6) of the implant part (2) delimited by an annular groove (7).