Flow Metering Insert for Drip Chamber with Hydraulic Resistance
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Solution Overview
Problem
Conventional flow meter devices for intravenous administration systems are either expensive due to high manufacturing costs and complex assembly, or inaccurate at low flow rates, and difficult to manufacture consistently, especially in reverse flow designs.
Innovation Solution
A flow metering insert for a drip chamber that includes a primary liquid flow channel and a flow indicating channel, providing resistance to liquid flow, allowing for a visual indication of flow rate through a proportional liquid level, which can be easily integrated into standard drip chambers, simplifying manufacturing and assembly while maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rotameter design is used for flow metering, then measurement precision is improved, but device complexity and manufacturing cost increase due to high tolerances and complex assembly
Solution Approach 1:
The flow meter is divided into two functional parts: a drip chamber and a separate flow metering insert. The insert contains the flow restrictor and indicating chamber, while the drip chamber handles liquid distribution. This segmentation allows each component to be optimized independently, simplifying manufacturing while maintaining measurement precision.
Solution Approach 2:
The flow metering insert is designed to be inserted into the drip chamber, with the insert fitting within the chamber's internal dimensions. The indicating chamber of the insert is visible through the transparent drip chamber wall, allowing the flow indication mechanism to be nested within the drip chamber structure without requiring separate housing.
2Measurement precision
If reverse flow design with orifice disk is used, then measurement precision is improved, but manufacturing cost increases due to complex assembly of small parts
Solution Approach 1:
The flow restrictor and indicating chamber are combined into a single integrated flow metering insert that is molded as one piece. This eliminates the need to assemble multiple small parts (orifice disk, housing, indicators) separately, reducing manufacturing complexity and cost while maintaining the measurement precision of the reverse flow design.
Solution Approach 2:
The flow metering insert is designed with universal dimensions that allow it to be inserted into standard drip chambers. The insert serves multiple functions: flow restriction, flow indication, and compatibility with standard drip chamber configurations, reducing the need for application-specific customization and lowering overall manufacturing costs.
3Measurement precision
If reverse flow design with flow restrictor tube is used, then measurement precision is improved, but device complexity increases due to complex geometry requirements
Solution Approach 1:
The flow restrictor tube is designed with specific local geometric features (narrowing at the upstream end, gradual expansion downstream) only where needed to create the flow resistance and prevent bubble trapping. The rest of the indicating chamber has simple cylindrical geometry, allowing the component to be molded using standard techniques while maintaining the complex flow characteristics needed for accurate measurement.
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 cost-effective, accurate, and reliable flow metering system that is easier to use and manufacture than existing designs, capable of accurately measuring flow rates even at low levels, without the need for complex assembly or high tolerances.
Implementation Method 1
The flow-resistant passage provides a resistance to a liquid flow therethrough such that liquid is forced into the flow indicating channel and reaches a level or height proportional to the rate of liquid flow
Data Source
AI summary
A flow metering insert (10) for a drip chamber (50) is provided that is suitable for use in intravenous administration. The insert comprises: a primary liquid flow channel with an inlet, an outlet, and a flow-resistant passage between the inlet and the outlet; and a flow indicating channel in communication with the primary liquid flow channel between the inlet and the flow-resistant passage. The flow-resistant passage provides a resistance to liquid flow such that liquid is forced into the flow indicating channel and reaches a height proportional to the rate of liquid flow through the primary liquid flow channel. The flow-resistant passage and the flow indicating channel are at least partially defined by one or more first recesses and/or channels in the insert such that the flow-resistant passage and the flow indicating channel are formed between the insert and a wall of the drip chamber when the insert is inserted into the drip chamber.