Photoimageable Nozzle Plate Barrier for Fluid Cross-Contamination
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Solution Overview
Problem
Fluid ejection devices face cross-contamination issues between multiple fluid supply vias, leading to inaccurate sample preparation and potential false test results in medical and laboratory settings.
Innovation Solution
A nozzle plate with arrays of nozzle holes and a barrier structure between them, made using a photoimageable layer with specific photoresist formulations and processing steps, to prevent fluid cross-contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple fluid supply vias are integrated into a single ejection head, then productivity and automation are improved, but cross-contamination between fluids occurs
Solution Approach 1:
The ejection head is segmented into multiple isolated ejection zones, each with its own fluid supply via and nozzle array. Physical barriers divide the ejection head into separate compartments that prevent fluid mixing while maintaining integrated operation, thus resolving the contradiction between multi-fluid capability and cross-contamination prevention.
Solution Approach 2:
Hydrophobic barrier structures serve as intermediary elements between adjacent fluid supply vias and nozzle arrays. These barriers act as mediators that block fluid migration paths while allowing the integrated ejection head to function as a unified device, preventing cross-contamination without sacrificing productivity.
2Object-affected harmful factors
If barrier structures are added between nozzle arrays, then cross-contamination is reduced, but device complexity increases
Solution Approach 1:
Thin-film hydrophobic barriers are used instead of bulky physical partitions. These thin-film structures provide effective fluid blocking while minimizing added complexity and maintaining a compact ejection head design. The barriers are integrated as thin layers within the existing structural framework rather than adding significant structural complexity.
3Object-affected harmful factors
If manual filling procedures are used, then cross-contamination can be controlled, but time consumption increases
Solution Approach 1:
The ejection head is designed with self-regulating fluid delivery through integrated fluid supply vias and nozzle arrays. The system automatically prevents cross-contamination through built-in hydrophobic barriers and proper fluid channel routing, eliminating the need for manual intervention while maintaining contamination control and reducing preparation time.
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 effectively reduces fluid cross-contamination, ensuring accurate and reliable sample preparation by preventing fluid mixing and corrosion on electrical contact pads, thereby enhancing the reliability of analytical results.
Implementation Method 1
A third negative photoresist layer is imaged and developed to provide a barrier structure between adjacent arrays of nozzle holes
Data Source
AI summary
A nozzle plate of a fluid ejection head for a fluid ejection device, a fluid ejection head containing the nozzle plate, and a method for making the fluid ejection head containing the nozzle plate. The nozzle plate contains two or more arrays of nozzle holes therein and a barrier structure disposed on an exposed surface of the nozzle plate between adjacent arrays of nozzle holes, wherein the barrier structure deters cross-contamination of fluids between the adjacent arrays of nozzle holes.