Segmented Intramedullary Structure for Bone Fracture Fixation
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Solution Overview
Problem
Current intramedullary nail systems for long bone fractures lack a secure and flexible structure for easy insertion and stable fixation within the intramedullary canal, often requiring complex procedures and materials that may not provide adequate rigidity or rotational stability.
Innovation Solution
A segmented intramedullary structure comprising interlocking segments with complementary ends and a tensioning member, such as a guide wire or cable, that applies compressive force to enhance rigidity and facilitate insertion through a percutaneous access hole, with optional features like bone cement for additional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a segmented intramedullary structure is used, then ease of insertion and flexibility are improved, but structural integrity and rigidity may be compromised
Solution Approach 1:
The intramedullary nail is divided into multiple segments that can be inserted separately through a percutaneous access hole. Each segment has complementary ends with male and female coupling features that interlock to form a continuous structure within the intramedullary canal, providing flexibility during insertion while maintaining structural integrity once assembled.
Solution Approach 2:
The segmented design allows each segment to be nested or telescoped during insertion, with segments passing through one another or being assembled in a telescopic manner. This nesting capability enables the segments to be introduced through a small percutaneous access hole while forming a long, rigid structure within the intramedullary canal.
2Strength
If a tensioning member is applied, then rigidity and rotational stability are enhanced, but device complexity increases
Solution Approach 1:
The guide wire or cable serves multiple functions: it acts as a guide for inserting the segmented nail, provides tensioning to enhance rigidity and rotational stability, and can serve as an anchoring element. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving enhanced rotational stability.
3Stability of the object's composition
If complementary-shaped ends are used for interconnection, then assembly stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The ends of the segments are designed with asymmetric complementary shapes, such as male and female coupling features with specific geometric profiles. This asymmetry provides stable, directionally-correct assembly while the features are designed with tolerances that balance manufacturing feasibility with assembly stability, allowing for self-alignment during insertion.
Data Source
AI summary
An implantable intramedullary fixation structure adapted to be received in the intramedullary canal of a long bone is disclosed comprising a plurality of elongated segments. Each segment has a first end and a complementarily-shaped second end such that the first end of a segment cooperatively engages the second end of an adjacent segment. The segments define a guide aperture so as to be receivable over a guide for positioning in the intramedullary canal.