Transparent Self-Sealing Medical Connector for Backflow Resistance
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Solution Overview
Problem
Current medical connectors face challenges in maintaining sterility during repeated sterilization and are prone to backflow issues, which can lead to contamination and premature replacement, especially when used with syringes that rebound or are disconnected.
Innovation Solution
A self-sealing medical connector with a transparent design that includes a two-way valve and a backflow resistance module, featuring a variable volume chamber and check valve to prevent backflow, along with a fluid diverter to direct fluid away from potential stagnation areas, ensuring sterility and minimizing backflow risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a medical connector is made transparent to allow visual monitoring of fluid flow, then the ability to detect fluid flow and monitor sterility is improved, but the manufacturing complexity and cost increase due to the need for high-quality transparent materials and precise molding
Solution Approach 1:
The patent employs transparent or translucent materials for the connector body that allow visual monitoring of fluid flow and air bubbles. The transparency enables direct observation of the internal fluid pathway without additional sensors or indicators, resolving the contradiction by using material optical properties rather than complex structural modifications.
Solution Approach 2:
The connector is divided into distinct functional segments including a body portion, a valve assembly, and a backflow prevention module. This segmentation allows each component to be optimized independently - the body can be transparent for monitoring while internal components handle specific functions like backflow prevention, reducing overall complexity.
2Reliability
If a self-sealing valve is implemented to maintain sterility during repeated use, then the reliability and duration of use are improved, but the device complexity increases due to the additional valve mechanism
Solution Approach 1:
The connector incorporates a self-sealing valve mechanism that automatically closes and seals when fluid flow stops or when the connector is disconnected. The valve uses the pressure differential and elastic deformation of sealing elements to achieve automatic sealing without external control systems, maintaining sterility while minimizing added complexity.
Solution Approach 2:
The valve sealing elements are made from flexible elastomeric materials that can deform to create tight seals. These thin flexible membranes provide effective sealing surfaces that conform to the valve seat geometry, ensuring sterility maintenance through simple elastic deformation rather than complex mechanical sealing structures.
3Reliability
If a backflow resistance module with check valve is added to prevent fluid backflow, then the reliability and patient safety are improved, but the device complexity and internal volume increase
Solution Approach 1:
The backflow prevention function is extracted as a separate modular component - a backflow resistance module containing a check valve mechanism. This module can be integrated into the connector body or used as an add-on component, allowing backflow protection to be added without redesigning the entire connector structure.
Solution Approach 2:
The check valve mechanism converts the harmful backflow pressure into a beneficial sealing force. When backflow pressure occurs, the pressure differential activates the check valve to close, and the same pressure helps maintain the seal against the valve seat, turning the potentially harmful reverse flow into a force that enhances the sealing action.
4Reliability
If a variable volume chamber is incorporated to accommodate syringe rebound, then the reliability is improved by preventing backflow, but the device complexity and manufacturing precision requirements increase
Solution Approach 1:
The variable volume chamber is designed with flexible walls or movable components that allow the chamber volume to dynamically adjust in response to pressure changes from syringe rebound. The chamber expands to accommodate reverse flow pressure and then seals to prevent backflow, providing adaptive volume control without requiring precision-machined fixed volumes.
Solution Approach 2:
The chamber volume parameter is allowed to change in response to operating conditions. The flexible chamber design permits volume variation within a controlled range to accommodate syringe rebound effects, reducing the need for precise fixed-volume manufacturing while maintaining reliable backflow prevention functionality.
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
The solution provides a reusable, sterile connection that maintains optical clarity of fluid flow, reduces contamination risks, and minimizes backflow effects, allowing for multiple uses without the need for frequent replacement, thus enhancing patient safety and operational efficiency.
Implementation Method 1
the connector includes a body member having a transparent wall with smooth inner and outer surfaces to provide a relatively distortion free optical view of the fluid level and fluid flow transferred through the connector
Implementation Method 2
the backflow resistance module can include a variable volume chamber configured to change in volume in response to a backflow-inducing event and a check valve configured to resist backflow
Implementation Method 3
A two-way valve can be employed, utilizing a reusable seal that may be repeatedly opened
Data Source
AI summary
A medical connector for use in a fluid pathway includes a substantially transparent housing having a proximal end with a proximal opening and a distal end with a distal opening, and a cavity extending therebetween. The connector provides a substantially visible fluid flow path extending through a substantial portion of the connector.