Microprojection Array Coating with Piezo Print Head Arrays
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Solution Overview
Problem
Current methods for coating microprojection arrays are inefficient, costly, and lack the precision and aseptic conditions required for pharmaceutical-grade manufacturing, particularly for delivering low-concentration biological materials like vaccines, leading to issues with contamination and uneven distribution.
Innovation Solution
A novel print head device utilizing a piezoelectric actuator and a two-dimensional nozzle array, designed for precise and simultaneous deposition of biological materials onto microprojection arrays, ensuring aseptic conditions and high throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dip-pen nanolithography is used to coat microprojections, then coating capability is achieved, but throughput is limited to less than 1 microprojection array per hour
Solution Approach 1:
The coating device is segmented into multiple independent print heads (e.g., 16 print heads arranged in a 4x4 array), where each print head can independently coat microprojections. This segmentation enables parallel processing, increasing throughput from less than 1 array per hour to potentially 16 or more arrays per hour while keeping each individual print head relatively simple in design.
Solution Approach 2:
Multiple print heads are merged into a single coating device that operates simultaneously on different regions of microprojection arrays. The print heads are positioned in close proximity and can be controlled to coat multiple arrays in parallel, combining their individual coating capabilities to achieve high throughput while maintaining simplicity of each component.
2Manufacturing precision
If conventional coating methods are used, then device complexity is low, but coating precision and control are insufficient for microprojection arrays
Solution Approach 1:
The print heads incorporate piezoelectric actuators that dynamically adjust the positioning and spacing of the microprojection arrays during coating. This dynamic control enables precise positioning (within nanometer accuracy) and real-time adjustment of coating parameters, achieving high manufacturing precision while using relatively simple piezoelectric components rather than complex mechanical systems.
Solution Approach 2:
The system incorporates feedback control through sensors that monitor the position and coating quality of microprojections in real-time. This feedback is used to adjust the piezoelectric actuator signals, ensuring precise coating placement and maintaining high manufacturing precision through closed-loop control rather than complex open-loop mechanical positioning systems.
3Reliability
If microprojection arrays are coated to prevent bacterial adhesion, then reliability is improved, but coating uniformity and coverage are difficult to achieve
Solution Approach 1:
The coating process applies different coating conditions to different local regions of the microprojection arrays based on their specific requirements. Each print head can be independently controlled to optimize coating parameters for its specific region, ensuring uniform coverage and appropriate coating quality across the entire array surface, which directly impacts anti-bacterial reliability.
Solution Approach 2:
The system changes coating parameters (such as coating material concentration, deposition rate, and microprojection spacing) dynamically during the coating process to optimize coating uniformity. By adjusting these parameters in real-time based on feedback from position sensors and coating quality monitoring, the system achieves consistent coating coverage across all microprojections, ensuring reliable anti-bacterial performance.
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 accurate and efficient coating of microprojection arrays with pharmaceutical-grade precision, reducing contamination risks and ensuring consistent delivery of biological materials, meeting regulatory standards for aseptic manufacturing.
Implementation Method 1
a first piezoelectric actuator is coupled to the first microprojection array and is configured to change a position of the first microprojection array in response to a first signal
Implementation Method 2
a second piezoelectric actuator is coupled to the second microprojection array and is configured to change a position of the second microprojection array in response to a second signal
Implementation Method 3
Device and method for coating surfaces including surfaces of medical devices, in particular the coating of microprojections on microprojection arrays
Data Source
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AI summary
The present invention relates to devices and methods for coating surfaces including surfaces of medical devices, in particular the coating of microprojections on microprojection arrays. The present invention also relates to print head devices and their manufacture and to methods of using the print head devices for manufacturing articles such as microprojection arrays as well as to coating the surfaces of microprojection arrays. The present invention also relates to high throughput printing devices that utilize the print heads of the present invention.