Flexible Resin Pressure Detection Device Preventing Fluid Accumulation
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Solution Overview
Problem
Conventional pressure sensors can accumulate fluid between the sensor body and the protector, leading to potential malfunctions when dealing with coagulable fluids like blood, as the fluid can solidify and recirculate through the flow channel.
Innovation Solution
A pressure detection device with a flow channel unit made of flexible resin, featuring a center flow channel with a thin film pressure receiving portion and end flow channels, preventing fluid accumulation by ensuring no sealed portions and allowing for accurate pressure detection without fluid accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor body is sealed with the body to form a pressure detection device, then the pressure detection function is achieved, but fluid may accumulate in the sealed space causing malfunction
Solution Approach 1:
The flow channel body is divided into multiple flow channels (first, second, and third flow channels) with the third flow channel positioned between the first and second. This segmentation creates a structured arrangement that prevents fluid accumulation by ensuring continuous fluid flow paths without sealed spaces.
Solution Approach 2:
The pressure detection portion and flow channel body are integrally formed as a single component, eliminating the sealed interface between separate parts that would create fluid accumulation spaces. This merging ensures that fluid can flow continuously through all channels without getting trapped at junctions.
2Measurement precision
If a conventional pressure sensor structure is used, then pressure detection is possible, but coagulable fluid may solidify and recirculate causing malfunction
Solution Approach 1:
The third flow channel is specifically designed with a thin film structure that has different properties from the other channels. This local quality difference allows the third channel to effectively transmit pressure from coagulable fluid while the overall structure prevents fluid accumulation and solidification through the integrated design.
Solution Approach 2:
The pressure detection function is extracted from a separate sensor component and integrated directly into the flow channel body structure. This extraction eliminates the need for separate sealed components that could trap fluid, allowing continuous fluid circulation even with coagulable substances.
3Ease of operation
If the flow channel body is made of flexible resin material, then fluid circulation is improved, but manufacturing precision may be affected
Solution Approach 1:
The pressure detection portion and flow channel body are integrally formed in a single manufacturing process, eliminating the need for separate assembly steps. This integration ensures that even with flexible resin material, the flow channels maintain consistent dimensions and proper alignment, as they are formed simultaneously as one piece.
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 effectively detects fluid pressure while preventing malfunctions due to fluid accumulation, ensuring reliable operation even with coagulable fluids, and enhances pressure detection accuracy through the use of a thin film pressure receiving portion and integrated flow channels.
Implementation Method 1
The center flow channel includes a pressure receiving portion having a thin film shape and disposed at a position sandwiched between the pair of end flow channels, a distance from an inner peripheral surface of the pressure receiving portion to an outer peripheral surface thereof being shorter than a distance from an inner peripheral surface of the pair of end flow channels to an outer peripheral surface thereof
Data Source
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AI summary
The flow channel unit includes: a pair of end flow channels disposed at an inflow port and an outflow port, respectively, and extending along in flow direction; a center flow channel including a pressure receiving portion having a thin film shape and disposed at a position sandwiched between the pair of end flow channels, a distance from an inner peripheral surface of the pressure receiving portion to an outer peripheral surface thereof being shorter than a distance from an inner peripheral surface of the pair of end flow channels to an outer peripheral surface thereof. The pair of end flow channels and the center flow channel are integrally formed of a flexible resin material, and the pressure detection portion is disposed such that the pressure of the fluid circulated through a flow channel is transmitted via the pressure receiving portion.