Color-Changing Check Valve Diaphragm for IV Patency Indication
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Solution Overview
Problem
Conventional check valves in IV sets require disassembly for patency verification, lacking a visual indication of fluid flow direction and pressure, necessitating additional pressure sensors.
Innovation Solution
A check valve with a flexible diaphragm made of color-changing material, integrated into the IV set, which bends or bows under fluid pressure, changing color to indicate patency and fluid flow direction without requiring disassembly or separate pressure sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional check valves are used in IV sets, then the basic fluid flow control function is achieved, but the patency verification requires disassembly and additional pressure sensors are needed
Solution Approach 1:
The patent applies color-changing materials to the diaphragm of the check valve. When fluid flows through the valve and exerts pressure on the diaphragm, the material changes color to visually indicate patency and flow direction. This eliminates the need for disassembly to verify patency and removes the requirement for separate pressure sensors, as the color change provides direct visual feedback about the valve's operational state.
Solution Approach 2:
The color-changing material acts as an intermediary between the fluid pressure and the observer. Instead of directly measuring or observing pressure mechanically or electronically, the material translates pressure into a visible color change, providing an intuitive visual indicator that simplifies the verification process without adding complex sensing mechanisms.
2Reliability
If the IV line is opened to check check valve patency, then patency can be verified, but fluid flow may be interrupted and contamination risk increases
Solution Approach 1:
The color-changing diaphragm allows patency verification to be performed externally by observing the color of the diaphragm through the transparent or translucent housing. This eliminates the need to open the IV line, thereby maintaining the sterile environment and preventing contamination while still providing accurate visual confirmation of valve patency and flow direction.
3Loss of information
If separate pressure sensors are added to indicate fluid flow, then flow direction can be monitored, but device complexity and cost increase
Solution Approach 1:
The color-changing material on the diaphragm provides visual information about fluid flow direction and pressure without requiring electronic sensors or complex signal processing. The diaphragm bends under fluid pressure, and this mechanical deformation triggers a color change that directly indicates flow presence and direction, eliminating the need for separate pressure sensors and associated electronics.
Solution Approach 2:
The check valve's diaphragm serves dual functions: it controls fluid flow as part of the valve mechanism and simultaneously provides visual indication of flow status through color change. This self-service capability means the valve structure itself provides the information function without requiring additional dedicated components for monitoring.
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
Enables visual confirmation of fluid flow and patency without opening the IV line, eliminating the need for separate pressure sensors and ensuring reliable fluid directionality.
Implementation Method 1
a flexible diaphragm comprising a color changing material configured to exhibit a color change when the flexible diaphragm is one of bent, bowed and deformed by a fluid flow from the fluid inlet
Data Source
AI summary
A check valve includes an upper housing defining an inlet of the check valve, and a lower housing having a seating portion and defining an outlet of the check valve. The check valve further includes a chamber interposed between and defined by the upper and lower housings for fluidly connecting the inlet and the outlet, and a flexible diaphragm mounted in the chamber. The flexible diaphragm selectively permits fluid flow in a first direction, and prevents fluid backflow in a second direction opposite to the first direction. The flexible diaphragm includes a color changing material, and when the flexible diaphragm is seated on the seating portion and bent due to force of the fluid flowing in the first direction, the flexible diaphragm exhibits a color change.