Spinal Fusion Cage With Rotatable Wing Plates for Stable Fixation

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Solution Overview

Problem

Conventional spine cages have issues with detachment risk and reduced plate stability due to fixed heights and lack of screw fixation, posing risks during spinal fusion procedures.

Innovation Solution

A spine fixing device with rotatable wing plates and adjustable coupling mechanisms, including a base plate, cage, and wing plates, which are coupled via spherical ends and tightened by screws, allowing flexible fixation and enhanced stability through a cover system.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the height of the front side of the cage is made high to correspond to the normal curvature of the spine, then the cage can better support the spine's curvature, but the risk of damage to adjacent nerves during insertion of the cage increases

Engineering Contradiction:

Improveadaptability to spine curvatureVSAvoidrisk of nerve damage during insertion

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The cage is designed with a rotatable wing plate that can change its angle relative to the base plate. This dynamic adjustment capability allows the cage to adapt to different spinal curvatures while maintaining a safe insertion profile. The wing plate can be rotated to a lower angle during insertion to minimize nerve damage risk, and then adjusted to the appropriate angle for supporting spinal curvature after insertion.

Inventive Principle:

Principle #15Dynamics

2Ease of manufacture

If conventional cages with constant front and rear heights are used, then the manufacturing is simple, but the risk of detachment of the cage after treatment is high

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidcage detachment risk

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The cage is divided into a base plate and a separate rotatable wing plate. This segmentation allows the wing plate to be independently adjusted and secured, providing better mechanical interlocking with the spine. The wing plate can be rotated into position and fixed at specific angles, creating multiple contact points that reduce the risk of cage detachment while maintaining manufacturing simplicity through modular construction.

Inventive Principle:

Principle #1Segmentation

3Device complexity

If conventional cages without screw fixation devices are used, then the device structure is simple, but the plate stability is reduced

Engineering Contradiction:

Improvedevice structure complexityVSAvoidplate stability

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

The screw fixation devices are integrated directly into the wing plate structure, merging the functions of the wing plate and the fixation mechanism into a single component. This integration provides enhanced plate stability through direct screw fixation to the spine while avoiding the need for separate fixation devices, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12502209B2Spine fixing device

Publication Date: 2025.12.23 INSPINE CO LTD

AI summary

Provided is a spine fixing device including: a base plate; a cage configured to be coupled to the base plate; a first wing plate configured to be coupled to an upper portion of a composite body of the base plate and the cage; and a second wing plate configured to be coupled to a lower portion of the composite body of the base plate and the cage.