IV Catheter Adapter Flashback Channel for Secure Septum Retention
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Solution Overview
Problem
Existing vascular access devices, such as over-the-needle peripheral intravenous catheters (PIVCs), face challenges in confirming proper placement due to imperfect vein occlusion, leading to potential blood leakage and exposure risks, and septum dislodgement during fluid infusion or blood withdrawal.
Innovation Solution
The IV catheter system features a catheter adapter with a cannula notch, a visualization channel, and stabilization ribs, utilizing materials with varying durometers for enhanced contact and securement, along with a secondary flashback chamber and visualization channel for improved blood flashback visualization and secure septum retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a septum is secured within the catheter assembly via friction and adhesive, then the catheter assembly can provide sealing to prevent outflow of fluid, but under pressurization from venous pressure or fluid injection, the septum may dislodge and present exposure risk to medical personnel
Solution Approach 1:
The catheter assembly is divided into distinct functional segments: a hub portion, a barrel portion, and a septum retention feature. The septum retention feature includes a retention cavity and a retention flange that creates a mechanical interlock system, separating the sealing function from the retention function to prevent dislodgement under pressure.
Solution Approach 2:
The septum retention feature is pre-configured with a retention cavity and retention flange structure before the septum is installed. The needle hub is pre-assembled with the barrel and stabilization features before catheter insertion, ensuring proper alignment and securement is established before use.
Solution Approach 3:
The catheter assembly combines different materials with complementary properties: the hub and barrel use materials providing structural integrity and chemical resistance, while the stabilization features use flexible materials that provide friction-based securement. The septum itself is made of a material that combines flexibility with pressure resistance.
2Productivity
If the catheter assembly is pressurized for fluid injection or blood collection, then the required function is achieved, but the septum may dislodge due to the pressure
Solution Approach 1:
The retention flange and retention cavity are designed to create a preliminary mechanical counter-action that opposes the dislodging force generated during pressurization. The stabilization features provide preliminary friction-based securement that resists movement before pressure is applied, preventing septum displacement during high-pressure operations.
3Difficulty of detecting and measuring
If the PIVC is made transparent to allow visualization of blood flashback, then proper placement can be confirmed, but the structural integrity and securement may be compromised
Solution Approach 1:
The catheter assembly uses local quality by making only the necessary portions transparent for visualization while maintaining structural integrity in other areas. The hub and stabilization features use opaque, structurally robust materials, while selective transparency is applied where visualization is needed without compromising overall strength.
Solution Approach 2:
The catheter system combines transparent materials for visualization components with opaque, high-strength materials for structural components. This composite approach allows the PIVC to maintain both transparency for blood flashback detection and sufficient structural integrity for securement and durability.
4Stability of the object's composition
If stabilization features are added to the catheter adapter to improve securement, then the catheter remains stable during use, but the device complexity increases
Solution Approach 1:
The stabilization features are merged with the existing catheter adapter structure rather than being added as separate components. The retention flange and retention cavity are integrated into the barrel and hub assembly, combining multiple functions (securement, retention, stabilization) into a unified structure that reduces overall device complexity.
Data Source
AI summary
An intravenous (IV) catheter system may include a catheter adapter having a proximal end and a distal end. The IV catheter system may also include a cannula extending through the catheter adapter. A proximal end of the cannula may include a notch. The IV catheter system may also include a needle hub, which may be coupled to the proximal end of the catheter adapter. The needle hub may include a flashback chamber, which may be in fluid communication with the notch when the IV catheter system is in an insertion configuration.