Intramedullary Nail End Cap Load Distribution
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Solution Overview
Problem
Current methods for securing intramedullary nails to bones lack effective and efficient solutions for stable attachment, particularly in ensuring a secure fit and distribution of loads to prevent complications during bone healing and nail integration.
Innovation Solution
A bone implant device comprising a single piece of biocompatible material with a bone securement portion and a nail securement portion, featuring oval-shaped fastening holes, a curved interface, and a conical receptacle for the intramedullary nail, allowing for various angular orientations and securement methods such as threaded fasteners or adhesives, to facilitate stable attachment and load management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to secure intramedullary nails to bones, then the attachment can be achieved, but the stability and load distribution are insufficient leading to potential complications
Solution Approach 1:
The end cap is divided into distinct functional portions: a bone securement portion with bone interface surface and fastening holes, and a nail securement portion with receptacle features. This segmentation allows each portion to be optimized for its specific function - the bone interface for load distribution and the receptacle for nail attachment - thereby resolving the contradiction between attachment stability and load distribution.
Solution Approach 2:
The bone interface surface is designed with specific local characteristics including curved surfaces that match bone geometry, angled sides for load distribution, and designated fastening hole locations. These local quality features ensure optimal load distribution across the bone interface while maintaining secure attachment stability.
2Reliability
If a secure fit is achieved through tight attachment, then stability is improved, but the adaptability to various bone geometries and angular orientations is reduced
Solution Approach 1:
The end cap design incorporates dynamic adaptability through its geometric features - the curved bone interface surface can conform to different bone geometries, and the angled sides provide multiple orientation options. This allows the device to achieve secure fit while adapting to various anatomical configurations and surgical requirements.
Solution Approach 2:
The device allows for parameter changes in terms of angular orientation and positioning. The angled sides and curved interface enable the end cap to be attached at different angles and positions on the bone, providing versatility while maintaining secure attachment through the fastening system.
3Strength
If multiple fastening holes are provided for secure attachment, then the attachment strength is improved, but the device complexity increases
Solution Approach 1:
The end cap combines multiple functions into a single integrated structure - the bone interface surface, fastening holes, and nail receptacle are all part of one piece. This merging provides strong attachment through multiple fastening holes while avoiding the complexity of separate components, as the entire assembly is formed as a unified device.
Data Source
AI summary
A means of fastening an intramedullary nail to the surface of a bone.