Multi-Shell Puncture System for Central Venous Catheterization
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Solution Overview
Problem
The Seldinger technique for central venous catheterization is complex, risky, and difficult to perform outside a hospital setting due to its sequential steps, potential for injury and infection, and the risk of the Seldinger wire causing arrhythmia or remaining in the patient.
Innovation Solution
A central venous catheter system with a multi-shell construction featuring a puncture needle inside a cannula, where the cannula is longitudinally displaceable and acts as a guide for the catheter tube, allowing for easier and safer insertion without the need for a Seldinger wire, with the cannula providing protection and aiding in the catheter's insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Seldinger technique is used for central venous catheterization, then the catheter can be inserted into the central vein, but the procedure becomes complex and time-consuming with multiple sequential steps
Solution Approach 1:
The patent combines the puncture needle, cannula, and catheter tube into a single integrated assembly where all components are pre-positioned and move together as one unit during insertion. This eliminates the need for separate manipulation of multiple components that characterizes the Seldinger technique, thereby simplifying the procedure while maintaining reliable catheter placement.
Solution Approach 2:
The patent employs a nested structure where the puncture needle is positioned within the cannula, and the catheter tube is positioned within the cannula. This nested arrangement allows all components to be inserted through a single puncture site in one continuous motion, avoiding the complex sequential steps required by traditional techniques.
2Reliability
If the Seldinger wire is used to guide the catheter, then the catheter can be placed in the central vein, but the risk of injury and infection increases
Solution Approach 1:
The patent extracts and eliminates the Seldinger wire from the procedure by using a self-contained needle-cannula-catheter assembly. This removes the source of potential contamination and injury associated with wire manipulation, while still achieving accurate central vein placement through the integrated design of the assembly.
Solution Approach 2:
The patent employs a disposable single-use assembly that is discarded after one procedure. This eliminates the risk of cross-contamination and repeated manipulation of wires or catheters, thereby reducing infection risk while maintaining placement accuracy through the pre-configured single-use design.
3Reliability
If the Seldinger wire is used for catheter guidance, then the catheter can be positioned correctly, but the wire may cause arrhythmia or remain in the patient
Solution Approach 1:
The patent removes the Seldinger wire entirely from the procedure by using an integrated needle-cannula-catheter assembly that guides itself during insertion. This eliminates the source of arrhythmia and wire retention risks while maintaining accurate catheter positioning through the pre-configured assembly design.
4Reliability
If multiple sequential steps are performed in the Seldinger technique, then the catheter can be inserted, but the procedure takes more time and requires sterile work field
Solution Approach 1:
The patent merges multiple separate操作步骤 into a single integrated insertion action. The needle, cannula, and catheter tube are pre-positioned relative to each other and move together as one unit, allowing the entire catheter placement to be accomplished in one continuous motion rather than through multiple sequential steps, thereby reducing procedure time and sterile field requirements.
5Ease of operation
If a catheter tube with restricted diameter is used for direct puncture, then the insertion is simpler, but the catheter cannot accommodate larger lumens
Solution Approach 1:
The patent uses a nested structure where a small puncture needle creates the initial access, followed by a cannula that is received within the catheter tube. This allows the final catheter to have a large lumen diameter for high-flow applications while the insertion process begins with a small needle puncture, combining the benefits of simple puncture with large-bore catheter capabilities.
Data Source
AI summary
The invention relates to a puncturing system comprising an outer tubular body which is designed to remain in a body part of a living being, characterized in that the puncturing system has at least one inner tubular body and a puncturing needle, wherein the inner tubular body is guided through a working lumen of the outer tubular body and can be longitudinally displaced with respect to the outer tubular body, and the puncturing needle is guided through a puncture lumen of the inner tubular body and the inner tubular body can be longitudinally displaced with respect to the puncturing needle, wherein, after a body part has been punctured by means of a puncturing section of the puncturing needle, which protrudes out of a patient-side end of the puncturing system, the inner tubular body can be moved out of the patient-side end of the catheter at least partially out of the outer tubular body, and is thereby designed to accommodate the puncturing section of the puncturing needle, which protrudes out of the patient-side end of the catheter, at least partially in the puncture lumen of the inner tubular body.