Fusion Spine Screw Porous Structure Bone Integration
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Solution Overview
Problem
Existing spine internal fixation systems face issues with screw loosening and unscrewing due to smooth bone threads, which compromise long-term stability and effectiveness.
Innovation Solution
A fusion spine internal fixation screw with a bone joint section featuring a multilayered porous structure and a solid reinforced core, coated with hydroxyapatite, promotes bone ingrowth and fusion with sclerotins, preventing long-term loosening or unscrewing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a smooth bone thread is used on the screw, then the screw is easy to screw in and out (ease of operation), but the screw is prone to loosening and unscrewing in the long term (reliability)
Solution Approach 1:
The patent applies a porous fusion part with porous structure on the bone joint section of the screw. This porous structure allows bone cells to grow into the pores and fuse with the screw, creating a biological anchor that prevents loosening and unscrewing while maintaining ease of insertion during surgery.
Solution Approach 2:
The patent combines a solid reinforced core with a porous fusion part to create a composite structure. The solid core provides mechanical strength and ease of insertion, while the porous outer layer enables bone ingrowth and long-term stability, resolving the contradiction between ease of operation and reliability.
2Strength
If a solid bone thread structure is used, then the screw has high mechanical strength (strength), but bone cells cannot grow into it (bone integration)
Solution Approach 1:
The patent segments the screw structure into two distinct parts: a solid reinforced core for mechanical strength and a porous fusion part for bone integration. This segmentation allows each part to fulfill its specific function without compromising the other.
Solution Approach 2:
The patent creates a composite structure where a solid reinforced core is combined with a porous fusion part. The solid core maintains mechanical strength while the porous outer layer enables bone cell infiltration and fusion, simultaneously achieving both strength and bone integration.
3Reliability
If a porous structure is added to the screw, then bone fusion is promoted (bone integration), but the structural complexity increases (device complexity)
Solution Approach 1:
The patent merges the solid core and porous fusion part into a single integrated component. This combining approach achieves bone fusion capability and anti-loosening function without requiring multiple separate components, thereby limiting the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The porous structure facilitates bone integration, enhancing mechanical stability and preventing screw loosening, thereby ensuring long-term fixation and stability.
Implementation Method 1
the porous fusion part is provided with a porous structure inosculated with spine sclerotins; the pourous structure is a multilayered porous structure, which comprises a plurality of pores communicated with one another
Implementation Method 2
a surface of the bone joint part is completely or partially applied with a hydroxyapatite coating
Implementation Method 3
the porous fusion part is arranged in a thread pitch space of the thread profile part
Data Source
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AI summary
A fusion spine internal fixation screw comprises a screw cap section (20) and a bone joint section (10) connected with the screw cap section (20), wherein the bone joint section (10) comprises a solid part (12) and a porous fusion part (11) fixedly arranged on the surface of the solid part (12); and the porous fusion part (11) is provided with a porous structure inosculated with spine sclerotins. The porous fusion part (11) of the bone joint section (10) of the fusion spine internal fixation screw is of a porous structure, which can promote bone cells to grow therein to fuse sclerotins with the screw after the fusion spine internal fixation screw is implanted into the sclerotins, so as to finally form a bone fusion state, which can effectively prevent the fusion spine internal fixation screw from being loosened or unscrewed in a long term.