Elastomeric Valve Preventing Blood Reflux in Catheters
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Solution Overview
Problem
Blood reflux into central lines and vascular catheters can lead to intraluminal thrombosis, causing occlusions that interfere with IV therapy and increase the risk of bacterial colonization, requiring frequent catheter replacement and posing health risks.
Innovation Solution
A pressure-controlled valve device with an elastomeric member and housing configuration that creates a pressure differential to deflect a peripheral wall or open a slit, allowing fluid flow while preventing reflux and bacterial growth, suitable for use with existing IV access systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve is designed to prevent blood reflux into catheters, then thrombosis and bacterial colonization are reduced, but the device complexity increases due to the elastomeric member and housing configuration
Solution Approach 1:
The patent employs an elastomeric member with a flexible peripheral wall that can deflect in response to pressure differentials. This flexible membrane structure creates a simple yet effective valve mechanism that prevents blood reflux without requiring complex mechanical components, thereby resolving the contradiction between reliability and device complexity
Solution Approach 2:
The valve operates autonomously by utilizing pressure differentials between the upper and lower sections of the housing to automatically deflect the peripheral wall and control fluid flow. This self-regulating mechanism eliminates the need for external control systems or power sources, maintaining simplicity while ensuring reliable prevention of reflux
2Strength
If the peripheral wall is made thick to provide structural support, then the valve durability increases, but the response time of the valve to pressure differential decreases
Solution Approach 1:
The patent optimizes the thickness parameter of the peripheral wall to achieve a balance between structural strength and responsiveness. By carefully selecting the thickness within specific ranges, the elastomeric member gains sufficient durability while maintaining the ability to deflect quickly in response to pressure differentials, thus resolving the contradiction between strength and speed
3Productivity
If the slit in the elastomeric member is made larger to permit fluid flow, then the fluid flow rate increases, but the sealing capability decreases
Solution Approach 1:
The patent employs a dynamic slit design where the opening size of the elastomeric member changes in response to pressure differentials. During normal operation, the slit remains relatively small to maintain sealing capability, but when a sufficient pressure differential is applied, the peripheral wall deflects to open the slit and increase fluid flow rate, thus dynamically balancing sealing and productivity requirements
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 valve effectively reduces blood reflux, prevents thrombosis, and minimizes bacterial colonization by controlling fluid flow direction and mixing, ensuring effective flushing and reducing the need for catheter replacement.
Implementation Method 1
upon creating a pressure differential between the upper section and the lower section of the housing causes either: (i) the peripheral wall to deflect from the housing permitting fluid flow around the elastomeric member; or (ii) the slit to open permitting fluid flow through the elastomeric member
Implementation Method 2
an elastomeric member positioned in the housing, the elastomeric member comprising a thickness, a continuous peripheral wall projecting from the thickness; and a slit extending through the thickness
Implementation Method 3
a continuous portion of the peripheral wall creating a continuous sealable contact with the housing and partitioning the housing into an upper section and a lower section
Data Source
AI summary
A valve is disclosed, the valve comprising a housing having an first opening and a second opening, and an elastomeric member positioned in the housing, the elastomeric member comprising a thickness, a continuous peripheral wall projecting from the thickness, and a slit extending through the thickness, a continuous portion of the peripheral wall creating a continuous sealable contact with the housing and partitioning the housing into an upper section and a lower section, the elastomeric member configured such that upon creating a pressure differential between the upper section and the lower section of the housing causes either: (i) the peripheral wall to deflect from the housing permitting fluid flow around the elastomeric member; or (ii) the slit to open permitting fluid flow through the elastomeric member. Methods using the valve are also disclosed.