Cannula Safety System with Segmented Guide Wire
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Solution Overview
Problem
Current puncture systems for blood vessels do not adequately address the risk of needlestick injuries during the Seldinger technique, particularly when deep-lying vessels are accessed, as existing safety devices are disruptive and not suited for the directional movements required.
Innovation Solution
A safety puncture system featuring a cannula with a beveled distal end and a guide wire designed in two parts, where the proximal section is detachably connected to the distal section, with a widened or locking area preventing the cannula's reinsertion, ensuring the cannula is securely removed and the guide wire's distal section can be used to secure the cannula tip, preventing accidental injuries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing safety devices are attached to the cannula for preventing needlestick injuries, then safety is improved, but the device becomes disruptive and difficult to use during Seldinger puncture of deep-lying vessels
Solution Approach 1:
The guide wire is divided into two separate sections: a distal section with functional tip and a proximal section with safety features. The proximal section includes a protective element that covers the cannula tip and a locking mechanism with a conical end piece. This segmentation allows the safety features to be integrated into the guide wire rather than attached to the cannula, eliminating the disruptiveness of external attachments while maintaining safety functionality during deep vessel puncture operations
Solution Approach 2:
The safety features (protective element and locking mechanism) are merged into the guide wire structure itself rather than being separate attachments to the cannula. The proximal section of the guide wire combines the protective covering and locking functionality in a single integrated component that moves with the guide wire, ensuring safety without interfering with cannula manipulation during the Seldinger technique
2Device complexity
If the guide wire is designed as a single piece, then the structure is simple, but safety features cannot be effectively integrated without disrupting cannula handling
Solution Approach 1:
The guide wire is segmented into a distal section and a proximal section that can be detachably connected. The proximal section contains the safety features (protective element and locking mechanism with conical end piece), while the distal section maintains the functional tip configuration. This segmentation enables safety functionality to be integrated without compromising the simplicity of the overall structure or the flexibility of the guide wire during insertion
3Productivity
If the cannula is removed from the blood vessel, then the guide wire can be used for catheter insertion, but the sharp cannula tip poses a risk of accidental injury
Solution Approach 1:
The protective element on the proximal section of the guide wire is designed to automatically cover the sharp cannula tip when the cannula is pulled back from the blood vessel. This preliminary protective action occurs as part of the normal cannula withdrawal process, ensuring the tip is covered before the cannula can pose any injury risk, while allowing the guide wire to remain in place for subsequent catheter insertion
Solution Approach 2:
The protective element acts as an intermediary between the sharp cannula tip and the operator's environment. When the cannula is withdrawn, the protective element extends beyond the cannula tip and physically blocks access to the sharp edge, mediating the potential harm while allowing the cannula to be fully removed for efficient catheter insertion procedures
Data Source
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AI summary
The invention relates to a safety puncturing system comprising a cannula (1) and a guidewire (5), said cannula (1) having a distal end with a polished portion (4), a proximal end (3) and a lumen for receiving the guidewire (5), the guidewire (5) having a proximal section (15) with a proximal end (16) and a distal end (16a) and a distal section (6). The proximal section (15) is detachably connected to the distal section (6) and the proximal end (16) of the proximal section (15) has an enlarged region.