Reaction Vessel Cap Sealing Mechanism for PCR Thermal Cycling
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Solution Overview
Problem
Current temperature control systems for chemical reactions, such as PCR, face challenges in maintaining precise temperature control and sealing to prevent contamination and evaporation, especially during thermocycling.
Innovation Solution
The system comprises reaction vessels with a groove around the top opening and matching RV caps that securely attach via ridges and grooves, ensuring a tight seal and reducing void volume with a lower convex RV plug to immobilize air, preventing movement during thermal cycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reaction vessel uses a simple open-top design, then ease of manufacture and device complexity are reduced, but temperature control precision and sealing to prevent contamination and evaporation deteriorate
Solution Approach 1:
The reaction vessel is divided into separate components: a reaction chamber, a cap, and a plug. The cap and plug can be independently manufactured and assembled, allowing for optimized sealing surfaces while maintaining manufacturing simplicity. The segmentation enables precise fitting of sealing elements without complicating the overall vessel structure.
Solution Approach 2:
The plug is inserted into the reaction chamber, and the cap encloses both the chamber and plug, creating a nested structure. This nesting approach allows multiple sealing interfaces (between cap and chamber, and between plug and chamber) to work together, enhancing sealing effectiveness without requiring a single complex sealed structure.
2Object-affected harmful factors
If a reaction vessel uses a tight-seal configuration with multiple mating surfaces, then contamination and evaporation prevention are improved, but manufacturing precision requirements and device complexity increase
Solution Approach 1:
Instead of requiring high precision across all mating surfaces, the design concentrates sealing functionality at specific localized areas: the interface between the cap and reaction chamber, and the interface between the plug and reaction chamber. By focusing precision requirements on these critical local sealing zones rather than the entire vessel structure, manufacturing becomes more feasible while maintaining effective seals.
3Reliability
If air voids are present in the reaction vessel, then ease of filling and device simplicity are maintained, but temperature control accuracy and thermal cycling reliability deteriorate due to air movement
Solution Approach 1:
The design extracts or removes air voids from the reaction vessel by using a plug that fills the bottom portion of the chamber and extends upward. This extraction of air space eliminates the harmful air movement that would occur during thermal cycling, improving reliability without requiring complex active control mechanisms.
Solution Approach 2:
The reaction mixture forms a flexible sealing interface against the plug and chamber walls. As temperature changes during thermal cycling, the reaction mixture can expand or contract while maintaining contact with the sealing surfaces, accommodating thermal expansion without creating air gaps or voids that would compromise reliability.
Data Source
AI summary
Aspects of the present disclosure include systems that include reaction vessels and reaction vessel caps. In certain aspects, the reaction vessels include a reaction chamber and a groove disposed around a top opening of a reaction chamber. The system also includes a RV cap that includes a cap body, a RV plug, and a lower wall that includes an outer radial groove disposed above an outward projecting ridge of the lower wall. When the cap is inserted into the RV, the RV plug of the RV cap is sealingly inserted into the reaction chamber of the RV, a ridge of the RV mates with the outer radial groove of the RV cap, and an outward projecting ridge of the RV cap mates with the radial groove of the RV. Also provided are methods and sample analysis systems, which may employ the RV/RV cap systems of the present disclosure.