Porous Bone Fusion Fastener for Compression and Pull-Out Resistance
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Solution Overview
Problem
Existing bone fusion devices lack effective means to provide enhanced compression and secure fixation, leading to issues such as pull-out and slip-out during use.
Innovation Solution
The invention introduces bone fusion devices with features like threaded and expandable sections, porous structures, and locking mechanisms, including spikes and polymer rings, to enhance compression and fixation, using suture buttons for linear compression between bone portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bone fusion devices are used, then the basic fastening function is provided, but the fixation is insufficient leading to pull-out and slip-out during use
Solution Approach 1:
The bone fusion device shaft is divided into multiple functional sections: a threaded proximal section for initial fixation and compression, and a porous distal section for enhanced bone ingrowth and anchoring. This segmentation allows each section to perform its specialized function, preventing both pull-out and slip-out failures
Solution Approach 2:
The device combines different structural characteristics in a single shaft: threaded portions for mechanical engagement and porous portions for biological integration. This composite structure provides both immediate mechanical fixation and long-term biological anchoring, significantly improving fixation reliability
2Strength
If simple bone screws or pins are used, then the device complexity is low, but the compression capability is insufficient for effective bone fusion
Solution Approach 1:
The shaft exhibits local quality variations with threaded sections providing compression at the proximal end and porous sections providing anchoring at the distal end. This localized functional differentiation enables effective compression without requiring complex overall device architecture
Solution Approach 2:
The device incorporates an expandable portion that can transition from a compressed state during insertion to an expanded state within the bone, enhancing compression capability dynamically while maintaining a compact form factor for minimally invasive insertion
Data Source
AI summary
A bone fusion device includes: a shaft including a porous section and a threaded proximal section configured for facilitating a compression; and a head threadably connected to the threaded proximal section, the head including a plurality of teeth configured for engaging with a bone, the bone fusion device being formed as a fastener.