Biosensor Retaining Structure for Precise Droplet Alignment
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Solution Overview
Problem
Existing methods for immobilizing molecules on sensor surfaces, such as acoustic wave sensors, result in inconsistent printing due to wandering droplets, leading to increased variability and inefficiency in manufacturing and device performance.
Innovation Solution
The use of mechanical features, including a retaining structure around the sensor, ensures precise alignment and retention of droplets, allowing for smaller volumes and consistent coverage of the resonating structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If larger droplet volumes are printed to accommodate variations in printing location, then coverage consistency is improved, but material waste increases and device performance deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-forming retaining structures on the sensor surface before droplet deposition. These structures create physical boundaries that guide and confine the droplet to the intended target area, eliminating the need to over-print to compensate for placement variations. The retaining structures are prepared in advance, so when the droplet is deposited, it is automatically contained within the correct boundaries.
Solution Approach 2:
The retaining structures serve as an intermediary element between the printing system and the sensor surface. Rather than relying on precise control of the printing system alone, the retaining structures act as a mediator that ensures the droplet remains within the target area regardless of minor placement variations, thus reducing material waste while maintaining coverage consistency.
2Manufacturing precision
If larger droplet volumes are printed to accommodate variations in printing location, then coverage consistency is improved, but sensor performance deteriorates
Solution Approach 1:
The retaining structures are pre-formed on the sensor surface to define the exact target area for droplet deposition. This preliminary preparation ensures that regardless of minor variations in droplet placement, the functionalized material will be confined to the correct sensor region, maintaining consistent sensor performance across manufactured devices.
Solution Approach 2:
The retaining structures act as an intermediary that decouples the printing precision from the final coverage consistency. By introducing this intermediate physical boundary, the system achieves reliable sensor performance even when droplet placement varies, as the retaining structures ensure proper confinement of the functionalized material to the sensor's active area.
3Reliability
If printing tip is raised further away from the surface to avoid contact, then contamination is reduced, but droplet placement accuracy deteriorates
Solution Approach 1:
The retaining structures serve as an intermediary that compensates for the reduced placement accuracy resulting from non-contact printing at greater distances. By providing physical boundaries on the surface, the retaining structures ensure that even droplets deposited with reduced precision will be confined to the correct target area, maintaining manufacturing quality while enabling contamination-free non-contact printing.
Data Source
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Figure 3A~3B
AI summary
This disclosure describes methods and devices that assist in forming biosensors. Specifically, features that align solutions containing molecules to be immobilized on biosensors. A retaining structure may be disposed at least partially around a target surface of a substrate. A resonating structure may be disposed on the target surface. A droplet of functionalized material may be disposed on the resonating structure and the target surface, which may be auto-aligned and retained by the retaining structure on the target surface to consistently cover the resonating structure.