Cannula Insertion Apparatus with Vacuum-Induced Blood Visualization
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Solution Overview
Problem
Current methods for inserting peripheral IV catheters face challenges in accurately placing the cannula within a blood vessel due to instability of blood vessels, potential missed penetration, and reliance on arterial backflow for visual confirmation, which can lead to subcutaneous hemorrhage and repeated attempts, resulting in inefficient and often unsuccessful procedures.
Innovation Solution
A cannula insertion apparatus with a transparent tubular member and plunger assembly that uses suction to draw blood into a cavity, providing a visual indication of cannula placement by creating a vacuum between the needle and cannula, allowing for precise deployment and repositioning without withdrawing the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the needle penetrates the blood vessel to allow cannula deployment, then blood can be drawn through the needle providing visual indication of penetration, but the needle may pass through the blood vessel completely or fail to penetrate properly, leading to subcutaneous hemorrhage and difficult vein reacquisition
Solution Approach 1:
The plunger is retracted to create a vacuum space in the hub before cannula deployment. This preliminary vacuum state allows blood to be drawn through the needle and into the hub, providing visual confirmation that the needle has penetrated the blood vessel correctly and the cannula is properly positioned, thereby preventing subcutaneous hemorrhage and vein blowout during subsequent cannula deployment
Solution Approach 2:
The system provides visual feedback through the transparent hub that allows the practitioner to observe blood flow from the needle into the hub. This feedback mechanism enables real-time verification of needle penetration and cannula placement accuracy, allowing immediate correction of positioning errors before permanent damage occurs
2Reliability
If the practitioner uses a syringe to provide suction for relocating the vein, then blood can be withdrawn to verify needle placement, but this requires additional components and repeated procedures, increasing complexity and time consumption
Solution Approach 1:
The vacuum generation capability is integrated directly into the cannula insertion apparatus through the plunger and hub assembly. This merging of functions eliminates the need for separate syringes and external suction devices, allowing the practitioner to verify vein location and cannula placement using the apparatus itself, thereby reducing overall device complexity and procedural steps
Solution Approach 2:
The hub serves multiple functions: it acts as the connection point for the cannula, the chamber for blood visualization, and the vacuum generator through plunger retraction. This multi-functionality consolidates what would otherwise require separate components, simplifying the overall apparatus while maintaining reliable vein location and cannula placement verification
3Productivity
If the cannula is deployed without proper visual confirmation of placement, then the procedure can be completed faster, but the cannula may be expelled or displaced from the blood vessel, requiring repeated attempts and resource consumption
Solution Approach 1:
The plunger is retracted to create a vacuum space in the hub before cannula deployment. This preliminary action establishes a visual confirmation mechanism that allows the practitioner to verify cannula placement accuracy immediately upon deployment, ensuring stable positioning without requiring repeated attempts while maintaining efficient procedure flow
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the reliability and accuracy of cannula placement, reducing the risk of subcutaneous hemorrhage and allowing for redeployment without disposing of the assembly, thus improving the success rate of IV catheter insertion.
Implementation Method 1
Retraction of the plunger forms a vacuum in the annulus between the needle and cannula, thereby drawing blood from a blood vessel or fluid from an anatomical space into the cavity created by displacement of the plunger within the tubular member
Implementation Method 2
utilizes an introducer which is a relatively short ergonomically shaped tubular member... that is adaptive to a cannula and hub assembly, for inserting the cannula into a selected subcutaneous blood vessel... When a blood vessel is pierced, by the needle, arterial pressure allows blood to flow though the needle and into the cavity located within the stem
Data Source
AI summary
A catheter insertion apparatus with visual indication of needle penetration of a blood vessel and placement of the catheter cannula within the blood vessel, using blood vessel pressure to indicate needle penetration by the presence of blood within a transparent chamber within the apparatus and the displacement of a plunger to create a negative pressure on the cannula and thus allowing blood to be visible within the catheter hub thereby indicating the introduction of the cannula into the blood vessel.