Microfluidic Device for Dynamic Atheroprone Flow Simulation
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Solution Overview
Problem
Current in vitro methods for reproducing blood flow patterns, particularly atheroprone and atheroprotective flows, are limited in their ability to accurately mimic in vivo conditions, hindering research and clinical applications related to cardiovascular diseases.
Innovation Solution
Development of microfluidic devices and methods that dynamically apply controlled spatio-temporal flow signatures, allowing for the simulation of atheroprone and atheroprotective flows by modulating flow amplitude and frequency, and enabling the study of endothelial cell responses to these conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional in vitro methods are used to reproduce blood flow patterns, then device simplicity is maintained, but flow pattern accuracy and physiological relevance deteriorate
Solution Approach 1:
The patent implements dynamic flow modulation by integrating controllable valves and pumps that can adjust flow rate, direction, and temporal patterns in real-time. This allows the device to transition from static to dynamic operation, accurately reproducing physiological flow variations including pulsatile and oscillatory patterns that conventional static devices cannot achieve.
Solution Approach 2:
The system enables precise control of multiple flow parameters simultaneously including flow rate, pressure, direction, and temporal frequency. By independently modulating these parameters through electronic control systems, the device can reproduce complex physiological flow signatures with high fidelity without requiring complex mechanical structures.
2Adaptability or versatility
If static flow conditions are applied in vitro, then ease of operation is maintained, but physiological relevance and research value deteriorate
Solution Approach 1:
The device is designed as a multi-functional platform that can generate various flow patterns (laminar, turbulent, pulsatile, oscillatory, bidirectional) using a unified control system. This universal approach allows researchers to study multiple physiological and pathological conditions with a single device, eliminating the need for multiple specialized apparatus while maintaining ease of operation through standardized interfaces.
Solution Approach 2:
The system incorporates periodic flow modulation capabilities that can reproduce physiological rhythms such as cardiac cycles, respiratory variations, and circadian patterns. Through programmable control, the device can apply time-varying flow conditions with precise frequency and amplitude control, enabling studies of cellular responses to dynamic mechanical stimuli that static systems cannot provide.
3Manufacturing precision
If uniform flow is applied across the entire device, then manufacturing simplicity is maintained, but ability to simulate regional flow differences deteriorates
Solution Approach 1:
The device incorporates multiple independently controlled flow channels and regions that can be segmented and addressed separately. Each channel or region can receive different flow conditions through dedicated control valves and flow splitters, enabling spatially resolved flow patterns that mimic regional hemodynamic differences in blood vessels while maintaining a modular manufacturing approach.
Solution Approach 2:
The system enables local flow modulation where different regions of the device can simultaneously experience different flow rates, directions, and temporal patterns. Through localized valve control and region-specific channel design, the device can create heterogeneous flow environments that accurately represent physiological variations across different vascular territories without requiring entirely different device architectures.
Data Source
AI summary
Endothelial cells can become susceptible to disease when subjected to disturbed (atheroprone) blood flow patterns, which naturally occur in known locations in human arteries. Atheroprone flow is non-laminar, with low fluid shear stress magnitude and an oscillatory pattern representative in the temporal signature. At a macro-scale, atheroprone flow is multidirectional and chaotic. On the other hand, atheroprotective flow is laminar with high fluid shear stresses that have a specific temporal signature. Therefore, understanding the interplay between the atheroprotective and atheroprone hemodynamics and endothelial function is important. The invention relates, in some embodiments, to microfluidic devices and methods that dynamically apply controlled and physiologically relevant spatio-temporal atheroprone and atheroprotective flow signatures. Further, some embodiments according to the invention recreate these flow profiles upon different regions of the same cell culture, more closely resembling the in-vivo phenomenon.