Bioprinter Spray Head Extension Rod Flow Channel Design
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Solution Overview
Problem
Existing 3D bioprinting technologies face issues with bio-ink clogging and cell damage due to high viscosity and mechanical forces, affecting printing efficiency and cell survival rates.
Innovation Solution
A bioprinter spray head assembly with a tapered and conical flow channel design, featuring an extension rod with an elongated flow channel adjacent to the spray head, reduces clogging and mechanical stress on cells, while a thermal insulation member maintains optimal temperature and activity of the bio-ink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If bio-ink is directly sprayed through the spray head, then the printing process is simple, but the high viscosity causes clogging and poor fluidity
Solution Approach 1:
The flow channel is segmented into multiple sections with different cross-sectional areas. The channel is divided into a first section with a first cross-sectional area and a second section with a second cross-sectional area that is larger than the first. This segmentation allows the bio-ink to be progressively accelerated as it moves through sections of increasing area, improving fluidity and preventing clogging while maintaining a relatively simple overall structure.
2Ease of operation
If cells are directly sprayed to the printing platform, then the printing process is straightforward, but mechanical forces significantly damage cells and reduce survival rate
Solution Approach 1:
A protective layer is formed beforehand by spraying a first material from the spray head that wraps around and protects the second material (containing cells) before the cells are deposited on the printing platform. This pre-formed protective cushion reduces the impact of mechanical forces during the spraying process, thereby protecting cells from damage and improving survival rates while maintaining operational simplicity.
3Device complexity
If the flow channel has a sudden narrowing at the outlet, then the spray head structure is simple, but the fluid printing units experience crowd and compression causing damage
Solution Approach 1:
The flow channel transitions from a first section to a second section using a curved or tapered transition rather than a sudden narrowing. The channel cross-sectional area gradually increases from the first section to the second section, creating a smooth flow path that prevents sudden compression and crowd effects on fluid printing units. This curved transition reduces mechanical damage while maintaining structural simplicity.
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 solution enhances the stability and flowability of bio-ink, reduces clogging and cell damage, and ensures a uniform and efficient spraying process, improving the reliability and quality of bioprinted constructs.
Implementation Method 1
a thermal insulation member maintains optimal temperature and activity of the bio-ink
Data Source
Figure 1
AI summary
The present disclosure relates to a bioprinter spray head assembly and a bioprinter, wherein the bioprinter spray head assembly comprises a spray head and an extension rod spaced from the spray head and disposed adjacent to an outlet of the spray head, wherein an elongated flow channel is provided in the extension rod to guide a fluid printing unit serving as a biological printing material in the flow channel to be orientedly sprayed. The bioprinter spray head assembly is configured such that a fluid print unit serving as a biological printing material is orientedly sprayed through the flow channel by providing an extension rod having an elongated flow channel adjacent to the outlet of the spray head. The elongated flow channel can perform an oriented sequence of the fluid printing unit, so as to reduce the possibility of clogging.