Nail Cap Cannula Alignment and Tissue Protection
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Solution Overview
Problem
Intramedullary nail systems face challenges in accurately positioning and securely engaging nail caps during surgical procedures, particularly in maintaining alignment and preventing tissue interference while ensuring accurate alignment of threads between the nail cap and intramedullary nail.
Innovation Solution
A nail cap cannula with a hollow body and retaining means that allows for engagement and disengagement with the intramedullary nail, facilitating the passage of the nail cap while maintaining alignment and preventing tissue obstruction, utilizing a radiolucent material with a radiopaque element for visualization and a contoured design to match the targeting guide and nail features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the nail cap is inserted through the intramedullary nail without a cannula, then the insertion path is direct, but tissue interference occurs and alignment accuracy is compromised
Solution Approach 1:
The nail cap cannula serves as an intermediary tool that facilitates the insertion of the nail cap. The cannula is inserted first, establishing a safe passage through the bone, and then the nail cap is threaded through the cannula. This mediator approach prevents direct tissue damage while ensuring accurate alignment, as the cannula's contoured design matches the targeting guide and nail features.
2Measurement precision
If the nail cap cannula is designed with a contoured shape to match the targeting guide, then alignment accuracy is improved, but the device complexity increases
Solution Approach 1:
The cannula features a contoured shape specifically at its proximal end that matches the curvature of the targeting guide. This localized adaptation ensures precise alignment and engagement without requiring the entire cannula to be complex. The contoured portion is precisely shaped to interface with the targeting guide's curvature, while the rest of the cannula maintains a simpler cylindrical structure.
3Reliability
If the throughbore of the intramedullary nail is sized to prevent passage of the nail cap, then secure retention is achieved, but the ease of insertion is reduced
Solution Approach 1:
The insertion process is segmented into two distinct phases: first, the cannula is inserted through the bone and engaged with the nail, establishing a secure pathway; second, the nail cap is threaded through the cannula and engages with the nail's throughbore. The throughbore is sized to prevent the cap's passage, ensuring retention, while the cannula's larger inner dimension accommodates the cap during insertion. This segmentation of functions resolves the contradiction between secure retention and ease of insertion.
Data Source
AI summary
A nail cap cannula for directing a nail cap useable with an intramedullary nail system including an intramedullary nail and a targeting guide.