Microtextured Miniaturized Tesla Pump for Variable Viscosity Biofluids
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Solution Overview
Problem
Current biofluidic pumping technologies, such as peristaltic and screw/diaphragm pumps, cause shear damage and hemolysis in biological fluids due to pulsatile and unreliable flow, which existing strategies like heparin coating only partially address, leading to stagnation in biofluidic pumping technologies.
Innovation Solution
A miniaturized Tesla pump (μTesla) utilizing low Reynolds number laminar flows between rotating disks to generate pressure, with surface microstructures optimizing fluid-surface coupling for specific viscosities, reducing shear stress and mechanical damage by achieving smooth, continuous flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If peristaltic or screw/diaphragm pumps are used to generate flow pressure, then sufficient pumping pressure is achieved, but shear damage and hemolysis occur due to pulsatile and time-varying flow velocities
Solution Approach 1:
The patent replaces traditional mechanical pumping mechanisms (peristaltic, screw, diaphragm) with a magnetically-driven rotating disk system. The magnetic field drives the rotor without direct mechanical contact, eliminating the pulsatile flow and sharp pressure gradients that cause shear damage to blood cells while maintaining sufficient pumping pressure.
Solution Approach 2:
The patent changes the flow regime parameters by operating at low Reynolds numbers to achieve laminar flow conditions. The rotating disk design with controlled rotational speed creates smooth, continuous flow with minimal velocity fluctuations, reducing shear stress on biological fluids while maintaining effective pumping pressure.
2Stress or pressure
If conventional pumping mechanisms are used, then flow pressure is generated, but flow is pulsatile and unreliable causing cellular damage
Solution Approach 1:
The magnetic field-driven rotating disk system replaces conventional mechanical pumps that produce pulsatile flow. The magnetic coupling provides smooth, continuous rotational motion that translates to stable, non-pulsatile flow output, eliminating the reliability issues and cellular damage associated with pulsatile flow while maintaining adequate pressure.
3Volume of moving object
If microfluidic pumps with valves or acoustics are used, then miniaturized pumping is achieved, but smooth laminar flow cannot be provided due to pulsatile driving forces
Solution Approach 1:
The patent replaces valve-based and acoustic microfluidic pumping mechanisms with a magnetically-driven rotating disk system. This substitution eliminates the pulsatile driving forces inherent in valve and acoustic pumps while maintaining miniaturized dimensions, achieving both compact size and smooth laminar flow essential for biological fluid handling.
4Object-affected harmful factors
If heparin coating or systemic injections are used, then blood clots from cellular damages are minimized, but significant risks of low blood pressure and side effects are introduced
Solution Approach 1:
The patent converts the harmful effect of mechanical pumping into a beneficial outcome by designing a magnetic field-driven system that inherently minimizes shear stress and cellular damage. This eliminates the need for heparin coating or systemic injections to prevent clots, avoiding the associated risks of low blood pressure and side effects while still protecting blood cells.
5Productivity
If microstructured surfaces are added to optimize fluid-surface coupling, then pumping effectiveness for specific viscosities is improved, but device complexity increases
Solution Approach 1:
The patent applies microstructured surfaces locally on the rotating disks to optimize fluid-surface coupling for specific viscosity ranges. Rather than making the entire device complex, the microstructures are confined to specific surface areas where they directly enhance pumping effectiveness for targeted applications, balancing performance improvement with manageable device complexity.
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 μTesla pump minimizes shear stress and mechanical damage, providing stable, laminar flow with reduced pressure fluctuations, suitable for biofluidic applications, and is more effective in pumping non-Newtonian fluids like blood, with optimized surface structures enhancing fluid velocities and pressures.
Implementation Method 1
utilizing low Reynolds number laminar flows between rotating disks to generate pressure
Implementation Method 2
low Reynolds number laminar flows
Implementation Method 3
surface microstructures optimizing fluid-surface coupling for specific viscosities
Data Source
AI summary
An integrated flow source is a limiting factor in numerous microfluidic applications. In addition to precise gradients and controlling molecular transports, a built-in source of stable and accurate flow can enable novel shear stress modulations for long-term cell culturing studies. The Tesla turbine, when used as a pump on the microfluidic regime, produces stable and accurate fluid gradients by utilizing laminar flow between its rotating discs Utilizing a stereolithography based 3D printer, a tesla pump (Ø10 cm) and associated housing capable of driving a microfluidic gradient is provided having a printed rotor surface topology of the pump in order to enhance pumping of biological fluids like blood at elevated viscosities. The surface topology is tuned via 3D pixilation, and this modulation completely recovered the pressure loss between pumping water at 1 cP versus glycerol solution at 3 cP. As a result, increased fluid viscosities, and even Non-Newtonian viscosities, can be used.