Temperature Compensation Flow-Limiting Device for Elastomeric Infusion
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Solution Overview
Problem
Elastomeric infusion systems experience instability in flow rate due to temperature changes, affecting the consistency and safety of medicinal solution delivery, as the diameter of infusion tubes and capillary elements expand with increasing temperature, and viscosity of the solution decreases, leading to variable flow velocities.
Innovation Solution
A temperature compensation flow-limiting device with an inner layer and an outer layer, where the coefficient of thermal expansion of the inner layer is greater than that of the outer layer, allowing the inner layer to expand and decrease in diameter as temperature increases, stabilizing the flow rate by compensating for changes in viscosity and diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the infusion tube and capillary element are made of standard materials, then the system is simple and cost-effective, but the flow rate becomes unstable when temperature changes occur
Solution Approach 1:
The capillary element is constructed as a composite structure with an inner layer and an outer layer, where each layer has different thermal expansion coefficients. This composite structure allows the device to compensate for temperature-induced flow rate changes without requiring complex external control mechanisms, thus improving reliability while maintaining relatively simple device complexity.
Solution Approach 2:
The invention utilizes the thermal expansion properties of different materials by selecting an inner layer and an outer layer with different coefficients of thermal expansion. When temperature changes occur, the differential expansion between the two layers compensates for the viscosity changes of the medicinal solution, thereby stabilizing the flow rate. This principle directly addresses the temperature-flow rate instability problem.
2Manufacturing precision
If a pressure regulator is added to stabilize flow velocity, then flow precision improves, but device complexity and cost increase
Solution Approach 1:
The capillary element performs self-compensation for temperature-induced flow rate changes through its composite structure. The differential thermal expansion between the inner and outer layers automatically adjusts the internal diameter to compensate for viscosity changes, eliminating the need for external pressure regulators or active control systems. This achieves flow velocity precision while maintaining simple device complexity.
Solution Approach 2:
The invention changes the physical parameters of the capillary element by using materials with different thermal expansion coefficients. This parameter change enables the capillary element to passively adapt to temperature variations and maintain stable flow characteristics without requiring additional active control components, thus improving precision while avoiding increased complexity.
3Manufacturing precision
If the capillary element diameter is reduced to increase flow precision, then flow control accuracy improves, but the system becomes more sensitive to temperature changes
Solution Approach 1:
The composite structure of the capillary element with different thermal expansion coefficients in the inner and outer layers creates a compensatory mechanism. When temperature changes cause the medicinal solution viscosity to change, the differential expansion between layers adjusts the effective internal diameter to counteract these changes. This reduces temperature sensitivity while maintaining flow control accuracy.
Solution Approach 2:
By using composite materials with different thermal properties, the capillary element achieves a balance between flow control accuracy and temperature sensitivity. The composite structure provides inherent temperature compensation, allowing the device to maintain precise flow control across a range of temperatures without requiring the capillary diameter to be excessively small, which would otherwise increase sensitivity.
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 device maintains a consistent and stable flow rate across varying temperatures, ensuring safe and precise delivery of medicinal solutions by effectively managing thermal expansion and viscosity changes, thereby enhancing the operational safety of elastomeric infusion systems.
Implementation Method 1
the coefficient of thermal expansion of the inner layer is greater than the coefficient of thermal expansion of the outer layer. When the temperature of the fluid inside the infusion tube increases, the inner layer expands and the internal diameter of the inner layer decreases
Data Source
AI summary
A temperature compensation flow-limiting device are provided. The temperature compensation flow-limiting device is disposed in the infusion tube of the elastomeric infusion system to improve instability, caused by changes to temperature, of the flow velocity of the fluid inside the infusion tube to keep the flow velocity of the fluid stable. The temperature compensation flow-limiting device includes an inner layer and an outer layer; the coefficient of thermal expansion (CTE) of the inner layer is greater than that of the outer layer. When the temperature of the fluid inside the infusion tube increases, the inner layer expands and the internal diameter decreases as it is limited by the outer layer.