Detachable Pressure Detection Device with Straight Flow Passage
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Solution Overview
Problem
Conventional flow passage units for pressure detection devices suffer from liquid stagnation issues, leading to bacterial generation and coagulation, especially when handling liquids like blood or dialysate, resulting in waste of expensive solutions during replacement.
Innovation Solution
A flow passage unit with a flexible, straight-line flow passage made of flexible material, surrounded by a pressure transmitting space filled with a non-compressible medium, which ensures that pressure is transmitted without stagnation, preventing bacterial growth and coagulation, and allows for easy assembly and sealing to maintain a closed system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an introduction flow passage is branched from a straight-line flow passage to introduce liquid to a fluid chamber, then liquid can be introduced to the pressure detection unit, but liquid stagnation occurs in the dead volume space and at flow direction change points
Solution Approach 1:
The flow passage is designed as a straight line from the inflow port to the outflow port, ensuring continuous liquid flow without dead volumes or stagnation points. This maintains the useful action of liquid flow throughout the entire passage, preventing bacterial generation and coagulation while still enabling liquid introduction to the fluid chamber.
2Measurement precision
If a branched introduction flow passage is used to introduce liquid to the fluid chamber, then pressure detection is enabled, but expensive liquid is wasted during flow passage unit replacement due to stagnation space charging
Solution Approach 1:
By eliminating dead volumes through the straight-line flow passage design, the system ensures that all liquid in the flow passage is utilized during operation and replacement. This prevents waste of expensive liquids (culture solutions, reagents, blood, dialysate) that would otherwise stagnate in branched passages and require discarding during unit replacement.
3Measurement precision
If liquid flows through a branched introduction passage, then pressure can be transmitted to the detection unit, but bacterial generation and coagulation occur in stagnation spaces
Solution Approach 1:
The straight-line flow passage design ensures continuous liquid flow without dead volumes where bacteria could generate or coagulation could occur. The pressure transmission function is maintained through this continuous flow path, eliminating harmful factors while preserving the measurement capability.
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 effectively transmits pressure without liquid stagnation, preventing bacterial growth and coagulation, and reduces waste by ensuring that the pressure detection device operates reliably with minimal liquid loss during replacements.
Implementation Method 1
a pressure transmission medium filled in the pressure transmitting space, and being non-compressible
Implementation Method 2
a flexible flow passage part including a flexible flow passage which introduces liquid, flowing in the flexible flow passage part from an inflow port, to an outflow port, and which is made of a flexible material
Data Source
AI summary
A flow passage unit is detachably mounted on a pressure detection unit and detects a pressure to be transmitted to a pressure detection part. The flow passage unit includes a flexible flow passage part including a flexible flow passage which introduces liquid, flowing in the flexible flow passage part from an inflow port, to an outflow port, and which is made of a flexible material. The flow passage unit also includes a body portion configured to form a pressure transmitting space which surrounds an outer peripheral surface of the flexible flow passage part. The flow passage unit also includes a pressure transmitting part mounted on the body portion and having a thin-film shape. One surface of the pressure transmitting part faces the pressure transmitting space, and the other surface of the pressure transmitting part is capable of coming into contact with the pressure detection part.