Intervertebral Cage With Sequential Blade Penetration Fixation
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Solution Overview
Problem
Existing interbody cages face difficulties in penetrating cortical bone due to simultaneous penetration of blades, requiring excessive force and complicating implantation.
Innovation Solution
The interbody cage employs a non-zero phase shift mechanism for blade portions, allowing sequential penetration into vertebral bones with reduced torque requirements, facilitated by a single or dual blade system with controlled rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blades penetrate cortical bone simultaneously, then fixation is achieved, but excessive force is required and implantation becomes difficult
Solution Approach 1:
The patent applies periodic action by implementing a phase shift mechanism that causes blade portions to penetrate the cortical bone sequentially rather than simultaneously. The first blade portion penetrates at a different time than the second blade portion, creating a periodic penetration pattern that reduces the instantaneous force required during implantation while still achieving reliable fixation of the interbody cage to the vertebral bodies.
2Strength
If excessive force is applied for blade penetration, then cortical bone is penetrated, but surgical complexity increases
Solution Approach 1:
The phase shift mechanism creates a periodic action where blade portions engage the bone at different times, distributing the penetration force over a longer time period. This reduces the peak force required at any moment, making the surgical procedure less complex and more controllable while still achieving adequate cortical bone penetration for secure fixation.
Data Source
Figure 1~3
AI summary
The present invention relates to interbody cages. The cage comprises an element 10 limited by two parallel faces 11, 12 adapted to come into contact respectively with two vertebral bodies and substantially defining two facial planes containing these two faces, means for locking the element 10 with two vertebrae comprising a portion of a lamina 21 and a portion of a lamina 22, means for controlling the movement of the lamina portions between two positions, the position Pr being that in which the lamina portions 21, 22 are entirely contained in the space defined between the two facial planes and the position Ps being that in which these lamina portions 21, 22 emerge from this space, these means being arranged to control the movement of the lamina portions so that one of the lamina portions emerges from the space before the other lamina portion.