Deformable Nail System for Bone Fusion Compression
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Solution Overview
Problem
Current implants used for fusing the tibia-talus-calcaneus complex often experience resorption, leading to gaping between joint surfaces, which can result in failed fusion and device failure.
Innovation Solution
A nail system comprising a first member with a deformable member at one end and a second member coupled to the first member, designed to provide compression across the joint surfaces, thereby preventing gaping and promoting bony opposition during healing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If currently available implants (intramedullary nails, crossing screws, or plating) are used for fusing the tibia-talus-calcaneus complex, then the fusion procedure can be performed, but resorption occurs causing gaping between joint surfaces leading to failed fusion and device failure
Solution Approach 1:
The implant incorporates a dynamic compression mechanism that automatically adjusts and maintains compression force across the joint surfaces. The deformable member (spring or shape memory alloy) provides continuous adaptive compression that compensates for resorption and maintains bony apposition throughout the healing process, preventing gaping and ensuring fusion success.
Solution Approach 2:
The implant utilizes shape memory alloy or spring-based deformable members that change their mechanical properties (compressive force) in response to temperature or stress conditions. This parameter change allows the implant to provide initial high compression for stability, then maintain appropriate compression levels as the bone heals, preventing resorption-induced gaping while promoting fusion.
2Stability of the object's composition
If rigid compression is applied to prevent gaping, then joint surface apposition is maintained, but the implant cannot accommodate resorption during healing
Solution Approach 1:
The deformable member (spring or shape memory alloy) provides dynamic adaptability, allowing the implant to maintain constant compression force despite changes in bone volume due to resorption. The spring compresses or extends, and the shape memory alloy changes shape or stiffness, to continuously accommodate resorption while maintaining joint surface apposition throughout the healing process.
Solution Approach 2:
The implant's deformable member automatically adjusts to accommodate resorption without requiring external intervention. The spring naturally compresses or extends, and the shape memory alloy self-adjusts its properties in response to temperature or stress changes, providing self-regulating compression that maintains bony apposition while adapting to healing-stage changes in bone volume.
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 nail system ensures continuous compression across the tibio-talar and talo-calcaneal joints, maintaining bony apposition and reducing the risk of nonunion and device failure.
Implementation Method 1
a first deformable member positioned at a first end of the first member
Data Source
AI summary
Implants, systems and methods for correcting bone deformities and fractures in the lower extremity are disclosed. Specifically, implants, systems and methods used for correcting bone deformities and/or fractures in the foot using compression are disclosed. A nail system including a first member with a first deformable member positioned at a first end of the first member and a second member received within the first member.