Pressure Cell Holder With Spring Ejection for Stable Dialysis Sensing
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Solution Overview
Problem
Existing pressure cell systems in extracorporeal blood treatment machines, such as dialysis machines, suffer from measurement inaccuracies due to unstable positioning of pressure transducer capsules, which lead to low-pass effects and complex, time-consuming connections that may not ensure tightness, resulting in loose or leaky connections.
Innovation Solution
A pressure cell holder with a gripping device and ejection mechanism, utilizing a spring mechanism to securely hold and automatically eject pressure cells, ensuring precise positioning and easy assembly/disassembly, and providing a tight connection to a fluid chamber via a pressure transmission line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure transducer capsules are suspended in hose lines to enable pressure monitoring, then pressure monitoring function is achieved, but measurement inaccuracies occur due to unstable positioning and low-pass effects
Solution Approach 1:
The patent introduces a holder as an intermediary component that suspends the pressure transducer capsule in a stable, defined position within the hose line. This holder acts as a mediator between the capsule and the hose line, providing mechanical support and positional stability while maintaining the pressure monitoring function. The holder eliminates the low-pass effect by preventing capsule movement that would otherwise occur when suspended freely in the hose line.
2Ease of operation
If Luer-lock connections are used to connect pressure transmission lines, then connections can be made, but assembly is time-consuming and tightness cannot be reliably ensured
Solution Approach 1:
The patent segments the connection system into distinct functional components: a holder that provides structural support and positioning, and separate Luer-lock connectors that provide fluid-tight connections. This segmentation allows the holder to be pre-assembled with the pressure transmission line, and then the capsule can be quickly attached to the holder without requiring time-consuming assembly operations. The holder acts as a pre-prepared interface that simplifies the overall assembly process.
3Device complexity
If pressure cells are directly connected to pressure sensors without holders, then connection simplicity is improved, but tightness requirements cannot be met and connections become complex
Solution Approach 1:
The patent applies preliminary action by pre-assembling the holder with the pressure transmission line and positioning components before the pressure capsule is inserted. The holder is prepared in advance with the correct positioning features and connection interfaces, so that when the capsule is attached, the entire assembly is already optimized for both simplicity and tightness. This preliminary preparation eliminates the need for complex assembly operations while ensuring reliable connections.
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
Enables quick and easy assembly/disassembly of pressure cells with accurate pressure measurements by ensuring a stable, gas-tight connection, reducing measurement inaccuracies and simplifying the connection process.
Implementation Method 1
utilizing a spring mechanism to securely hold and automatically eject pressure cells
Data Source
AI summary
A pressure cell holder for attachment to a housing of an extracorporeal blood treatment machine, such as a dialysis machine. The pressure cell holder includes a gripping device for holding a pressure cell inserted into the pressure cell holder by enclosing or engaging the pressure cell, and an ejector mechanism for ejecting the pressure cell when the gripping device is released.