Capillary Staining Module for Evaporation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for preparing biological specimens for analysis, such as microscopy and immunohistochemical staining, face challenges including inconsistent processing due to manual techniques, contamination, excessive reagent usage, and slow diffusion of reagents into tissue, leading to inefficient and costly procedures with high waste generation.
Innovation Solution
A slide processing apparatus with a staining module that includes a slide holder platen, an opposable element, and an actuator forming a capillary gap, along with a controller to manage the volume and evaporation rate of liquids, ensuring consistent and efficient processing by controlling the movement and temperature of reagents across the specimen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual techniques are used for specimen preparation, then flexibility and adaptability are maintained, but processing consistency and reliability deteriorate
Solution Approach 1:
The system controls and adjusts key parameters such as liquid volume, temperature, and capillary gap dimensions to achieve consistent processing results. By precisely controlling these parameters through automation, the system maintains reliability while managing complexity through standardized parameter sets.
Solution Approach 2:
Manual mechanical operations are replaced with automated mechanical systems that use actuators to control the opposable element and liquid delivery mechanisms. This substitution eliminates human variability while maintaining the essential functions of specimen preparation through programmable automation.
2Reliability
If excessive reagent volumes are used, then complete coverage and processing are ensured, but reagent consumption and waste generation increase
Solution Approach 1:
The system applies reagents locally to only the areas where specimens are present on the slide, rather than flooding the entire slide surface. The opposable element and capillary gap configuration deliver reagents precisely to specimen locations, ensuring complete coverage of specimens while minimizing overall reagent consumption.
Solution Approach 2:
The system uses a reusable opposable element that can be repeatedly used to apply reagents to multiple specimens. This element acts as a transfer medium that copies the reagent application pattern across different specimen areas, reducing the total volume of reagents needed compared to direct application methods.
3Speed
If reagents are applied in large volumes, then diffusion into tissue is facilitated, but processing time and evaporation losses increase
Solution Approach 1:
By concentrating reagents locally at the specimen site through the capillary gap mechanism, the system achieves high local reagent concentration that facilitates rapid diffusion into the tissue. This localized application eliminates the need for large volumes and extended processing times required by flood application methods.
Solution Approach 2:
The system controls temperature as a key parameter to enhance diffusion rates. By maintaining optimal temperature conditions during the staining process, the system accelerates reagent diffusion into the tissue, reducing processing time while using minimal reagent volumes delivered through the capillary gap.
4Ease of operation
If open liquid application is used, then ease of operation is maintained, but contamination and evaporation increase
Solution Approach 1:
The opposable element functions as a flexible transfer medium that contacts the liquid reagent and transfers it to the specimen through the capillary gap. This thin film mechanism replaces open liquid application, preventing evaporation and contamination while maintaining ease of operation through automated actuation of the opposable element.
Solution Approach 2:
The opposable element serves as an intermediary between the liquid reagent source and the specimen. It picks up the reagent and transfers it through the controlled capillary gap, eliminating direct open application. This intermediary mechanism prevents contamination and evaporation while the actuator controls the process, maintaining operational simplicity.
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
This approach enables consistent and efficient specimen processing with reduced reagent usage, minimized contamination, and faster staining rates, while maintaining a uniform temperature profile, thereby improving processing efficiency and reducing waste.
Implementation Method 1
an opposable element held by an opposable actuator... forming a capillary gap between the opposable element and the slide
Implementation Method 2
The slide holder platen is configured to heat a liquid on a slide... to moderate evaporation of the liquid
Implementation Method 3
the opposable actuator is moveable to roll a curved portion of the opposable element along the slide to move a band of liquid across at least a portion of the slide
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A specimen processing system is capable of processing specimens carried on slides. The specimen processing system can sequentially deliver slides and opposables to specimen processing stations. The specimen processing stations can use the opposables to apply a series of liquids to the specimens. The applied liquid can be moved along the slide using capillary action while the specimen processing stations control the processing temperatures.