Needle-Shaped Electrode Droplet Control for Biochip Spot Uniformity
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Solution Overview
Problem
Conventional biochip manufacturing devices fail to maintain a constant droplet volume, leading to inconsistent spot sizes on the substrate, which affects the precision of DNA sequence analysis.
Innovation Solution
A device utilizing an electric charge concentration effect with a needle-shaped electric field generating electrode, a volume measuring unit, and a droplet control unit to maintain a predetermined droplet volume, ensuring uniform spot sizes by applying a voltage pulse and using a syringe pump to adjust the solution volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional droplet generating member is used without volume control, then the device structure is simple, but the droplet volume varies over time causing non-uniform spot sizes
Solution Approach 1:
The patent implements a feedback control system where a volume measuring unit continuously monitors the droplet volume and the droplet control unit adjusts the solution supply accordingly. This closed-loop feedback mechanism maintains constant droplet volume despite evaporation and other variations, resolving the contradiction between simple structure and precise manufacturing by adding intelligence to the system.
Solution Approach 2:
The patent dynamically adjusts the solution supply rate based on real-time droplet volume measurements. The droplet control unit changes the flow rate parameter of the solution supply to compensate for volume losses, ensuring consistent droplet volumes. This parameter adjustment strategy enables precise spot size control while maintaining a relatively simple overall device architecture.
2Measurement precision
If the droplet volume is not maintained constant, then the device operation is simple, but the spot size on substrate becomes non-uniform affecting DNA analysis precision
Solution Approach 1:
The system performs self-regulation through automatic volume measurement and control. The volume measuring unit continuously monitors droplet size and the control unit automatically adjusts solution supply without external intervention. This self-service capability maintains high measurement precision for DNA analysis while keeping the operation simple and automated.
Solution Approach 2:
The patent replaces manual control mechanisms with automated electronic control systems. Instead of mechanical adjustments, the system uses electronic sensors and controllers to monitor and regulate droplet volume. This substitution maintains ease of operation while significantly improving the precision of DNA sequence analysis through consistent spot sizes.
3Manufacturing precision
If a volume control system is added to maintain constant droplet volume, then spot size uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent integrates multiple functions into compact components. The droplet control unit serves both as a control processor and as part of the feedback system, while the volume measuring unit combines sensing and measurement functions. This multi-functionality approach achieves high spot size consistency without proportionally increasing device complexity, as components perform multiple roles.
Solution Approach 2:
The patent introduces an intermediary control layer between the solution supply and the droplet generation. The droplet control unit acts as a mediator that receives signals from the volume measuring unit and adjusts the solution supply accordingly. This intermediary approach simplifies the overall system architecture by providing a dedicated control layer that manages complexity centrally.
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 consistent droplet volumes and spot sizes on the substrate, enhancing the precision of biochip manufacturing and DNA sequence analysis.
Implementation Method 1
a voltage applier applying a voltage to the droplet so that the droplet can be dropped onto the target portion of the substrate
Implementation Method 2
supplies electric charges to the electric field generating electrode so that the droplet drops onto the target portion of the substrate due to a Coulomb force generated between the charges of the electric field generating electrode and charges induced in the substrate
Implementation Method 3
The pump may be a syringe pump
Implementation Method 4
a light source emitting light onto the droplet; an image sensor sensing an image of the droplet that is generated by the light emitted from the light source
Data Source
AI summary
A device for printing a droplet onto a substrate includes: a droplet generating member which is needle-shaped and comprises a receiving portion disposed vertically to receive a solution, and a discharge hole connected to the receiving portion and formed on a bottom of the receiving portion so that the solution can be discharged from the receiving portion; a substrate disposed below the droplet generating member, the substrate includes a target portion to which the droplet discharged from the discharge hole of the droplet generating member is dropped and attached; a voltage applier applying a voltage to the droplet so that the droplet can be dropped onto the target portion of the substrate; a volume measuring unit measuring the volume of the droplet; and a droplet control unit maintaining the volume of the droplet at a predetermined level based on the measured volume of the droplet.