Intraosseous Needle With Fenestrations and Threads
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Solution Overview
Problem
Intraosseous infusion needles face issues such as tip obstruction, needle backout, and extravasation due to smooth shafts and lack of secure engagement with bone cortex, leading to ineffective fluid delivery and potential muscle damage.
Innovation Solution
The design of an intraosseous needle assembly with a removable stylet and geometric torque structure, featuring fenestrations for fluid distribution and threads for secure engagement with the bone cortex, allowing for multiple insertion methods and reducing extravasation risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an intraosseous needle has a smooth shaft for easy insertion, then insertion ease is improved, but needle backout occurs due to lack of secure engagement with bone cortex
Solution Approach 1:
The needle shaft features localized threading in specific regions rather than being uniformly threaded throughout. This allows the shaft to maintain smooth sections for easy insertion while having threaded sections that engage with the bone cortex to prevent backout, thus resolving the contradiction between insertion ease and needle retention
Solution Approach 2:
The needle shaft is divided into multiple functional sections: a smooth proximal section for insertion, a threaded middle section for cortical engagement and retention, and a distal section with the open tip for fluid delivery. This segmentation allows each section to optimize its specific function without compromising the others
2Productivity
If an intraosseous needle has an open tip for fluid delivery, then fluid delivery efficiency is improved, but tip obstruction occurs with bone during or after insertion
Solution Approach 1:
The stylet is inserted into the needle shaft beforehand to protect the open tip during the insertion process. The stylet acts as a temporary plug that prevents bone debris from entering and obstructing the tip. After successful insertion, the stylet is removed to allow fluid delivery, thus preserving tip patency while maintaining delivery efficiency
3Device complexity
If an intraosseous needle is designed for single-method insertion (hammer or drill), then device simplicity is improved, but adaptability is reduced
Solution Approach 1:
The needle assembly is designed with universal compatibility for multiple insertion methods. The shaft includes engagement features that work with both hammer impact and drill rotation, allowing the same needle design to be used with either insertion method without requiring method-specific variations, thus achieving versatility without proportionally increasing complexity
4Device complexity
If an intraosseous needle lacks secure engagement features, then device simplicity is improved, but extravasation risk increases leading to compartment syndrome
Solution Approach 1:
Threaded engagement features are applied locally to the needle shaft at the region where cortical contact occurs during insertion. These threads provide secure anchoring to prevent needle migration and extravasation, while the rest of the shaft remains relatively simple in design, thus reducing extravasation risk without substantially increasing overall device complexity
Data Source
AI summary
An intraosseous needle includes a cylindrical shaft. The cylindrical shaft includes a first portion comprising a plurality of threads protruding from the cylindrical shaft. The cylindrical shaft includes a second portion comprising a plurality of fenestrations, disposed between the first portion and a distal end of the cylindrical shaft, wherein the cylindrical shaft is continuous and smooth within the second portion, and where the continuous, smooth second portion is longer than the first portion. The intraosseous needle also includes a needle head extending from a proximal end of the cylindrical shaft.