Sample Processing Assembly With Cam Retention Against Slide Sticking
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Solution Overview
Problem
Existing sample processing assemblies face issues of slide sticking due to dehydration, particularly when forming a reaction chamber, which leads to additional hydration steps and limits the availability of robotic dispensers for other reactions, and also results in slide sticking to cover members or seals during high-temperature incubation.
Innovation Solution
A sample processing assembly with a substrate retaining mechanism that includes a rotatable closure body and a substrate retaining arm, utilizing a cam and cam follower system to ensure the substrate is securely held during chamber formation and separation, preventing slide sticking by applying continuous force until separation and allowing vertical disengagement to maintain substrate position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated sample processing systems are used to treat tissue samples, then productivity is improved, but sample dehydration occurs leading to slide sticking
Solution Approach 1:
The substrate retaining arm is positioned to engage the substrate before the cover member is fully removed, preventing slide sticking by maintaining contact during the critical transition phase when dehydration effects are most problematic
Solution Approach 2:
The substrate retaining arm acts as an intermediary mechanism between the automated processing system and the substrate, providing continuous mechanical support and preventing direct contact between the dehydrated slide and the cover member that would cause sticking
2Reliability
If hydration solution is constantly applied to prevent dehydration, then reliability is improved, but device complexity increases due to additional robotic dispensing requirements
Solution Approach 1:
The substrate retaining mechanism extracts the function of preventing dehydration-related sticking from the robotic dispensing system, allowing the hydration system to be simplified or eliminated while maintaining reliability through mechanical retention
3Productivity
If the cover member is removed quickly from the substrate, then productivity is improved, but slide sticking occurs due to capillary forces
Solution Approach 1:
The substrate retaining arm is pre-positioned to engage the substrate before the cover member is fully removed, counteracting capillary forces by maintaining mechanical contact and preventing the slide from being pulled away by surface tension
Solution Approach 2:
The substrate retaining arm provides a counteracting mechanical force that balances the capillary forces generated during rapid cover member removal, preventing sticking by opposing the harmful adhesive forces
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 assembly effectively prevents slide sticking during chamber formation and separation, ensuring reliable substrate retention and preventing dehydration-related issues, thus optimizing the use of robotic dispensers for other reactions.
Implementation Method 1
a cam, and a substrate retaining arm rotatable about the first pivot axis, the substrate retaining arm including a cam follower for sliding engagement with the cam
Implementation Method 2
The staining chamber height is frequently only 140 microns, so the capillary force is strong enough to hold the tile to the cover member
Data Source
AI summary
A processing assembly for treatment of a sample on a substrate, including: a mounting block including a mounting surface for the substrate; a closure body configured to support a cover member; a closure body arm engaging with the closure body so that rotation of the arm about a pivot axis causes movement of the closure body between the open and closed positions; and a substrate retaining mechanism. The mechanism includes: a cam, and a substrate retaining arm including a cam follower engaging the cam. When the closure body is closed and the cover member engages the substrate, the substrate retaining arm is clear of the substrate, as the closure body arm commences rotation to enable the closure body to rotate towards the open position, but whilst the closure body remains in a closed position, the substrate retaining arm moves into engagement with the substrate, and disengages with the substrate.