Flow Chamber Permeable Membrane for Accurate NO Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional single compartment flow chambers are unable to accurately detect and measure low concentrations of diffusible molecules, such as nitric oxide (NO), due to convective transport and sensor placement issues, which distort the flow profile and mask the NO signal.
Innovation Solution
A flow chamber design with a permeable membrane separating two compartments, allowing analytes to diffuse from the first compartment to the second where sensors can detect them without being affected by convective forces, enabling accurate measurement of low concentration analytes like NO.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are placed close to cell surface to reduce concentration gradient effects, then measurement accuracy improves, but flow profile is disturbed and shear stress is altered
Solution Approach 1:
A permeable membrane is introduced as an intermediary barrier between the flow chamber and the sensor. The membrane allows NO molecules to diffuse through while physically separating the sensor from the direct flow path, thus enabling accurate measurement without disturbing the flow profile or altering shear stress conditions.
Solution Approach 2:
The flow chamber is divided into two separate compartments by the permeable membrane. The first compartment contains the cells exposed to flow, while the second compartment houses the sensor in a quiescent environment, allowing independent optimization of flow conditions for cells and measurement conditions for the sensor.
2Productivity
If sensors are placed in flow conditions to measure NO, then real-time detection is enabled, but convective transport creates steep concentration gradients that mask the signal
Solution Approach 1:
The system is segmented into two compartments: the first compartment maintains controlled flow conditions for real-time NO production by cells, while the second compartment provides a quiescent sensing environment that eliminates convective transport effects, allowing accurate detection of low NO concentrations.
Solution Approach 2:
The permeable membrane acts as a mediator that transmits NO molecules from the flowing first compartment to the stationary second compartment, decoupling the conflicting requirements of real-time flow exposure and signal-accurate measurement.
3Measurement precision
If electrodes are used for NO measurement in flow, then detection sensitivity is improved, but flow sensitivity of electrodes distorts or masks the NO signal
Solution Approach 1:
The permeable membrane serves as a protective intermediary that isolates the flow-sensitive electrode from direct exposure to flow conditions. The electrode can detect NO with high sensitivity in the second compartment while the membrane prevents flow-induced disturbances and signal masking.
Solution Approach 2:
Different compartments are assigned different flow conditions: the first compartment has controlled flow for physiological relevance, while the second compartment has quiescent conditions optimized for sensor performance, allowing each region to have the quality needed for its specific function.
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
This design allows for real-time, direct detection of analytes in low concentrations by shielding them from convective transport, providing accurate and reliable measurements of NO and other cell-produced molecules under controlled conditions.
Implementation Method 1
A permeable membrane, having a first surface that is exposed to fluid flow in the first compartment a second surface positioned within the second compartment separates the first and second compartments
Data Source
AI summary
A flow chamber and method for detecting the presence of one more cell produced analytes under flow conditions. The flow chamber includes two compartments separated by a permeable membrane on which a plurality of cells may be positioned. The permeable membrane shields one or more analyte sensors positioned one compartment from the convective transport forces of a fluid flow within the other compartment to allow reliable and accurate detection of cell-produced analytes and determination of the concentration of cell-produced analytes.