Microplate Carrier Moat Design for Evaporation Control
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Solution Overview
Problem
Standard microplates experience edge effects due to differential environmental conditions, leading to data inconsistency in cell-based assays, particularly in live-cell assays where evaporation and temperature variations affect the border wells.
Innovation Solution
A multiwell microplate design featuring a moat around the wells with compartments that hold hydration fluid, reducing evaporation and maintaining a humidified buffer between the wells and the external environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If border wells are used in standard microplates, then assay capacity is increased, but data consistency deteriorates due to edge effects and evaporative cooling
Solution Approach 1:
The patent introduces a lid with a moisture-holding layer as an intermediary component between the assay wells and the external environment. This layer acts as a mediator that provides humidity control to the wells, preventing evaporative cooling and edge effects while allowing the border wells to be used for assays. The moisture-holding layer absorbs and releases moisture to maintain stable humidity conditions across all wells including border wells.
2Reliability
If border wells are sacrificed to provide humidity buffer, then data consistency improves, but assay capacity significantly diminishes
Solution Approach 1:
The lid with moisture-holding layer serves as an intermediary that provides humidity control without requiring sacrifice of border wells. This allows all wells in the microplate array to be used for assays while maintaining data consistency through active humidity management.
Solution Approach 2:
The patent changes the humidity parameter control from passive (using border wells as buffers) to active (using a moisture-holding layer in the lid). This allows dynamic control of humidity levels to maintain consistency across all wells while maximizing assay capacity.
3Loss of substance
If wells are sealed with oil or plastic film, then evaporation is reduced, but addition of reagents during assay becomes impossible
Solution Approach 1:
The moisture-holding layer in the lid acts as an intermediary that reduces evaporation without creating a seal. It allows vapor phase moisture transfer while preventing liquid loss, maintaining both evaporation reduction and ease of reagent addition.
Solution Approach 2:
The patent uses a thin film moisture-holding layer that is permeable to water vapor but provides sufficient humidity control. This flexible film approach allows both evaporation reduction and maintenance of operational flexibility for reagent addition.
4Reliability
If large volume border troughs are used, then environmental buffer is improved, but device complexity and fluid handling difficulty increase
Solution Approach 1:
The moisture-holding layer in the lid serves as a distributed intermediary that provides environmental buffering across all wells without requiring large volume border troughs. This simplifies the device structure while maintaining reliable humidity control.
Solution Approach 2:
The patent moves the humidity control function from the horizontal plane (border troughs surrounding wells) to the vertical dimension (lid covering all wells). This dimensional shift provides environmental buffering without requiring complex border structures or large fluid volumes.
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 moat design significantly reduces fluid loss and temperature variations in the wells, leading to improved data consistency and cell health during assays, as demonstrated by reduced well-to-well variability in metabolic rates.
Implementation Method 1
The evaporation of liquid from wells adjacent to the border of the plate occurs at a higher rate than that of non-border wells. This causes a temperature drop in the border wells due to evaporative cooling
Data Source
Figure 1a
Figure 1b
Figure 1c1~1c2
AI summary
A multiwell microplate for holding liquid samples, and a method of use thereof. The multiwell microplate includes a frame defining a plurality of wells disposed in a single column, each well having an opening with a length l1. A moat is disposed about the plurality of wells. A plurality of walls traverses the moat, the walls defining a plurality of compartments, each compartment having a length l2 selected from a range of greater than l1 and less than 6l1. A multiwell microplate carrier includes a body defining a plurality of regions configured to hold a plurality of multiwell microplates in parallel, each multiwell microplate defining a single column of wells, and each of the regions defining a plurality of openings that are adapted to mate with the single columns of wells.