SAW Bioprinting Cell Aggregation for Ultrahigh-Density Organ Printing
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Solution Overview
Problem
Existing bioprinting methods and devices struggle to achieve ultrahigh cell densities due to cellular damage from mechanical squeezing or lack of effective cell assembly strategies, limiting the application of 3D bioprinting.
Innovation Solution
An acoustic fluid-mediated bottom-up bioprinting device using an array surface acoustic wave (SAW) chip to aggregate cells via a focused acoustic flow, forming a vortex that concentrates cells at the center of a circular acoustic field boundary, enabling precise and controllable cell density up to billion cells per milliliter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If jet-based bioprinting is used to achieve high cell density, then cell density can be increased, but cellular damage occurs due to mechanical squeezing or traction
Solution Approach 1:
The patent replaces mechanical squeezing and traction methods with acoustic wave-based cell aggregation. Surface acoustic waves (SAWs) are used to generate acoustic radiation pressure that concentrates cells at the focal point without mechanical contact, thereby achieving high cell density while avoiding cellular damage from mechanical forces
Solution Approach 2:
The patent introduces acoustic waves as an intermediary medium to transfer energy for cell aggregation. The acoustic field acts as a non-contact mediator that applies gentle pressure to concentrate cells, avoiding direct mechanical contact that would cause damage while still achieving the desired cell density
2Object-affected harmful factors
If lithography-based bioprinting is used to avoid mechanical damage, then cell integrity is maintained, but there is no effective cell assembly strategy to achieve high cell density
Solution Approach 1:
The patent replaces lithography-based static cell placement with dynamic acoustic wave-driven cell assembly. Surface acoustic waves create moving focal points that actively concentrate cells through acoustic radiation pressure, providing an effective cell assembly strategy that maintains cell integrity while achieving ultrahigh cell density
Solution Approach 2:
The patent introduces dynamic control of cell aggregation through adjustable acoustic wave parameters. The frequency, amplitude, and focal position of surface acoustic waves can be dynamically modified to control cell concentration speed and density, enabling effective cell assembly while maintaining cell viability
3Manufacturing precision
If traditional 3D bioprinting methods are used, then basic tissue structures can be formed, but ultrahigh cell density printing is limited due to technical bottlenecks
Solution Approach 1:
The patent combines acoustic wave-based cell aggregation with photopolymerization to achieve precise spatial control of high-density cell structures. The acoustic field concentrates cells with micrometer precision, and the subsequent photopolymerization locks cells in place, enabling both ultrahigh cell density and high manufacturing precision simultaneously
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 achieves rapid construction of artificial organs with ultrahigh cell density and complex geometric structures, enhancing cell function and precision to 10 μm, allowing quick printing of centimeter-sized tissues within half an hour.
Implementation Method 1
the array SAW chip includes a plurality of interdigital electrodes which are arranged in a same horizontal plane and distributed on a circle; the interdigital electrodes are focused SAW interdigital electrodes
Implementation Method 2
the array SAW chip is in contact with the printing ink and is able to form a focused acoustic flow in the printing ink between the array SAW chip and the printing platform to aggregate the cells in the printing ink
Implementation Method 3
the printing ink is a mixed solution of cells and a photocurable bioink; the curing light source is able to expose a projection into the printing ink above the printing platform and cure the printing ink above the printing platform
Data Source
AI summary
An acoustic fluid-mediated bottom-up bioprinting device for functional organs with an ultrahigh cell density and a printing method are provided, the acoustic fluid-mediated bottom-up bioprinting device includes an array SAW chip, a printing container, a printing platform and a curing light source; the printing container is used for containing a printing ink; the printing platform is able to move upward and downward in the printing ink; the array SAW chip includes a plurality of interdigital electrodes; a central axis of each interdigital electrode deflects from a direction towards a center of the circle; the array SAW chip is in contact with the printing ink and is able to form a focused acoustic flow to aggregate the cells in the printing ink; the curing light source is able to expose a projection into the printing ink above the printing platform and cure the printing ink above the printing platform.