Catheter Anchor System for Migration Control
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Solution Overview
Problem
Current intravenous cannulas face challenges in securely anchoring to the skin, leading to potential migration and increased risk of infection, irritation, and complications like phlebitis and thrombus formation due to inadequate external and subcutaneous anchoring mechanisms.
Innovation Solution
A medical system comprising both an exterior anchor device and a subcutaneous anchor device that work in conjunction to securely position an intravenous cannula, with the exterior anchor being movable and lockable relative to the hub, and the subcutaneous anchor engaging under the skin to prevent both inward and outward migration of the cannula.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive tape is used to secure the intravenous cannula, then the cannula can be anchored to the skin, but the cannula may still migrate or become dislodged due to inadequate anchoring strength
Solution Approach 1:
The anchor mechanism is divided into two distinct segments: an external anchor device that remains outside the skin and a subcutaneous anchor device that engages beneath the skin. This segmentation allows each component to perform its specific anchoring function independently, providing reliable cannula stabilization without requiring a single complex integrated system.
Solution Approach 2:
The patent combines the external anchor device and subcutaneous anchor device into a unified anchoring system that works together to secure the cannula. The external anchor provides initial stabilization while the subcutaneous anchor engages to prevent migration, creating a comprehensive anchoring solution that addresses both skin-level and subcutaneous-level securing needs.
2Adaptability or versatility
If the external anchor device is made movable and lockable relative to the hub, then the anchor can be adjustably positioned against the skin, but the mechanism becomes more complex
Solution Approach 1:
The external anchor device incorporates a movable and lockable mechanism that transitions from a movable state during positioning to a locked state during use. This dynamic design allows the anchor to be adjusted to different positions along the cannula and against the skin, providing adaptability while maintaining structural integrity when locked in place.
Solution Approach 2:
The lockable mechanism acts as an intermediary between the movable external anchor and the fixed hub structure. It provides a controlled transition point that allows easy adjustment during application while ensuring stable, fixed positioning during use, thereby balancing adaptability with simplicity.
3Reliability
If a subcutaneous anchor device is used to prevent proximal migration, then the cannula remains securely in place, but the risk of distal migration remains without an external anchor
Solution Approach 1:
The anchoring function is segmented into two directional components: the subcutaneous anchor device specifically addresses proximal migration (preventing the cannula from being pulled out), while the external anchor device addresses distal migration (preventing the cannula from being pushed further in). This segmentation allows each component to optimize its design for its specific directional function.
Solution Approach 2:
Each anchor device is designed with local quality tailored to its specific function: the subcutaneous anchor features engagement elements optimized for tissue penetration and retention in the subcutaneous layer, while the external anchor features a surface designed for contact with and adhesion to the skin surface. This localized optimization provides effective bidirectional anchoring.
Data Source
AI summary
Some embodiments of a medical system include a catheter device, such as an intravenous cannula device, having an external anchor device and a subcutaneous anchor device to secure a distally extending cannula of the device in a selected position relative to a skin penetration point.