Disposable Fluid Conductivity Sensor With Bubble Extraction Chamber
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Solution Overview
Problem
Existing hemodialysis systems lack an efficient and user-friendly method to monitor the conductivity of medical fluids, such as dialysate, which is crucial for maintaining proper sodium concentrations and patient comfort.
Innovation Solution
A disposable device with a chamber and electrodes is designed to measure electrical characteristics of medical fluids, directing bubbles away from the electrodes to improve accuracy and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bubbles are present in the fluid during measurement, then measurement accuracy deteriorates, but eliminating bubbles requires complex degassing systems
Solution Approach 1:
The patent extracts and removes bubbles from the measurement system by providing a dedicated bubble removal chamber separate from the measurement chamber. Bubbles are extracted from the fluid stream before it reaches the electrodes, eliminating interference with conductivity measurements without requiring complex degassing systems throughout the entire apparatus.
Solution Approach 2:
The patent introduces an intermediary bubble removal chamber between the fluid source and the measurement electrodes. This intermediary component serves as a mediator that cleans the fluid of bubbles before measurement, protecting the sensitive measurement process from bubble interference without requiring direct intervention in the measurement chamber itself.
2Ease of operation
If a disposable device is used for measurement, then ease of operation and calibration improve, but device complexity increases due to integration requirements
Solution Approach 1:
The patent merges multiple functions into a single disposable device: the bubble removal chamber, measurement chamber, and electrode assembly are integrated into one unified structure. This combination eliminates the need for separate calibration procedures and complex assembly, improving ease of operation while the modular design keeps the integrated structure manageable.
Solution Approach 2:
The patent employs a disposable measurement device that is used once and then discarded. This approach eliminates the need for complex calibration procedures and repeated cleaning/maintenance, as each new disposable unit is pre-calibrated and ready to use. The temporary nature of the device simplifies its design, allowing integration of multiple functions without long-term durability concerns.
3Length of moving object
If the chamber length is reduced for compactness, then device portability improves, but measurement accuracy may deteriorate
Solution Approach 1:
The patent compensates for reduced chamber length by optimizing the electrode geometry and arrangement. Instead of relying solely on increased length for accurate measurement, the design adjusts electrode surface area, spacing, and configuration to maintain the necessary measurement precision within a compact form factor.
Solution Approach 2:
The patent changes key measurement parameters such as electrode surface area, electrode spacing, and chamber cross-sectional area to compensate for the reduced length. By adjusting these parameters, the device maintains accurate conductivity measurements despite the compact size, allowing portability improvement without sacrificing measurement precision.
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 allows for accurate monitoring of fluid conductivity, ensuring proper sodium balance and patient comfort, while being easy to use and calibrate, even for non-medical professionals.
Implementation Method 1
The two electrodes are configured to measure electrical voltage in the fluid that enters the chamber through the inlet and flows out of the chamber through the outlet
Implementation Method 2
The chamber is designed so that bubbles in the fluid are directed away from electrodes that measure the electrical characteristics of the fluid
Data Source
AI summary
A device for measuring conductivity of a fluid. The device including a chamber and at least two electrodes. The chamber includes an inlet, an outlet, an upper surface, and a lower surface that runs separate from the upper surface. The fluid enters the chamber through the inlet and flows out of the chamber through the outlet. Moving along a length of the chamber from the inlet to the outlet or from the outlet to the inlet, a distance between the upper surface and the lower surface changes in at least one dimension of the chamber. The two electrodes are configured to measure electrical voltage in the fluid that enters the chamber through the inlet and flows out of the chamber through the outlet.