Bioprinting Print Head with Buffer Displacement for Clean Fiber Ends
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Solution Overview
Problem
Existing 3D bioprinting systems face inaccuracies and distortions due to issues with the commencement and cessation of the printing process, leading to the formation of leading and trailing fibers that affect the dimensions of printed fibers and structures.
Innovation Solution
A print head system with a dispensing channel, material channels, a buffer solution channel, and a sheath solution channel, configured to displace input materials with a buffer solution, maintaining a constant mass flow rate and ensuring precise control over the printing process, including the use of a crosslinking component to solidify fibers, allowing for high fidelity reproduction of 3D structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing 3D bioprinting systems are used, then the printing process can be performed, but inaccuracies and distortions occur due to uncontrolled commencement and cessation, leading to leading and trailing fibers
Solution Approach 1:
The system performs preliminary actions by flushing the dispensing channel with buffer solution before actual material deposition to ensure the channel is clear, and by maintaining a constant mass flow rate throughout the process to prevent leading and trailing fibers. The buffer solution displacement mechanism is activated in advance to control the commencement and cessation of material flow precisely.
Solution Approach 2:
The system incorporates feedback control through flow sensors and pressure monitoring that continuously monitor the dispensing process. When the trigger is activated, the system detects the presence of material in the channel and automatically adjusts the pump rates to maintain constant mass flow, ensuring accurate commencement and cessation of fiber deposition.
2Manufacturing precision
If multiple channels (material, buffer, sheath) are integrated into the print head, then precise control over printing process is achieved, but device complexity increases
Solution Approach 1:
The system merges multiple functions into a single integrated print head assembly. The material channel, buffer solution channel, and sheath solution channel are combined in one device, allowing simultaneous control of all three fluids. The pump system is also integrated to control flow rates of all channels from a single control unit, reducing overall system complexity while maintaining precision.
Solution Approach 2:
The buffer solution serves multiple functions: it cleans the dispensing channel before deposition, maintains constant mass flow rate during deposition, and displaces material precisely at cessation. The sheath solution similarly provides both structural support during deposition and protects the deposited fiber. This multi-functionality reduces the need for separate systems for each function.
3Manufacturing precision
If constant mass flow rate is maintained through buffer solution displacement, then leading and trailing fibers are eliminated, but the printing process requires more complex flow control
Solution Approach 1:
The system uses the buffer solution itself to control the flow rate. By adjusting the buffer solution pump rate to match the material flow rate, the system automatically maintains constant mass flow without requiring external intervention. The buffer solution acts as its own control mechanism, displacing material in a controlled manner to prevent leading and trailing fibers.
Solution Approach 2:
The system uses hydraulic principles by controlling the flow rates of incompressible fluids (buffer solution and sheath solution) through the dispensing channel. By maintaining equal and opposite flow rates of buffer solution displacement and material deposition, the system achieves constant mass flow rate control through purely hydraulic means, eliminating the need for complex mechanical flow control mechanisms.
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 system achieves high fidelity replicas of 3D objects by maintaining precise control over the printing process, eliminating leading and trailing fibers, and ensuring consistent deposition of solidified fiber structures with clean ends, enabling the creation of accurate and structured 3D structures, including those with living cells.
Implementation Method 1
contacting the first input material with the sheath solution in the dispensing channel to generate a solidified fiber structure
Data Source
AI summary
Aspects of the invention include systems and methods for producing fiber structures, and for producing three-dimensional (3D) biological structures from digital files. In some embodiments, the printed fibers comprise living cells. Aspects of the invention further include a print head for producing the fiber structure, the print head comprising: a dispensing channel comprising a distal and proximal end; a dispensing orifice located at the distal end of the dispensing channel; one or more material channels converging with the dispensing channel at its proximal end; a buffer solution channel converging with the one or more material channels at the proximal end of the dispensing channel; and a sheath solution channel converging with the dispensing channel at a position located between the proximal and distal ends of the dispensing channel. The print head is configured to displace one or more input materials with a buffer solution at the proximal end of the dispensing channel to terminate the fiber structure with a clean tail end.