Blood Flow Regulator Membrane Dynamics for Vein Collapse Prevention
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Solution Overview
Problem
Conventional blood collection methods using evacuated tubes often result in vein collapse due to rapid blood flow, especially in areas with limited blood supply, as they create high vacuum pressure that exceeds the natural inflow rate, leading to inefficient blood collection and variability in flow control.
Innovation Solution
A flow regulator with a membrane that moves between open and restricted positions in response to pressure differentials, controlling the flow rate by deflecting to partially restrict the flow path, thereby regulating the blood flow and reducing vein collapse risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If evacuated tube vacuum pressure is increased to improve blood collection speed, then productivity increases, but vein collapse occurs due to excessive flow rate
Solution Approach 1:
The flow regulator employs a dynamic valve member that automatically adjusts its position in response to pressure differentials between the blood collection site and the evacuated tube. The valve member moves between open and restricted positions based on real-time pressure conditions, enabling the system to maintain high collection speed while preventing vein collapse through automatic flow modulation.
Solution Approach 2:
The flow regulator incorporates a feedback mechanism where the pressure differential across the membrane directly controls valve member positioning. When pressure differential increases (indicating potential vein collapse risk), the valve automatically restricts flow; when pressure differential decreases (safe conditions), the valve opens to maximize flow rate, creating a self-regulating system.
2Loss of time
If vacuum pressure is increased to reduce collection time, then loss of time decreases, but flow rate becomes uncontrollable leading to vein collapse
Solution Approach 1:
The flow regulator is designed to automatically control flow rate without requiring technician intervention. The valve member self-adjusts based on pressure differential conditions, eliminating the need for manual flow control while maintaining optimal collection speed and preventing vein collapse throughout the procedure.
Solution Approach 2:
The system transitions from static vacuum pressure to dynamic flow control where the valve member continuously adapts its opening degree based on real-time pressure conditions, enabling both rapid collection and automatic flow regulation without technician skill dependency.
3Productivity
If high vacuum pressure is applied to increase blood flow rate, then productivity improves, but the flow rate exceeds natural inflow rate causing vein collapse
Solution Approach 1:
The flow regulator applies preliminary counter-action by restricting flow before vein collapse can occur. The valve member proactively modulates flow rate in response to pressure differential changes, preventing the condition where outflow exceeds inflow and causing vein collapse, rather than merely responding after collapse begins.
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 flow regulator effectively manages blood flow rates, reducing vein collapse and improving collection efficiency by automatically adjusting to maintain a balanced flow, ensuring consistent blood collection without relying heavily on technician skill.
Implementation Method 1
The membrane is configured to move between the first and second positions in response to a pressure differential acting on the membrane
Data Source
AI summary
A flow regulator for a blood collection assembly includes a housing having an inlet and an outlet, which defines an interior space between the inlet and the outlet. A membrane having a first surface and a second surface is disposed at least partially within the interior space. The membrane has a first position where a flow path between the inlet and the outlet is substantially open, and a second position where the flow path between the inlet and the outlet is at least partially restricted. The membrane is configured to move between the first and second positions in response to a pressure differential acting on the membrane.