Pipette Tip Loading Assembly Beveled Receptacles Alignment
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Solution Overview
Problem
The attachment of pipette tips onto multi-channel pipettors is a prone-to-error step, often resulting in malfunction due to misalignment or defective manufacturing, leading to fluid transfer failures and potential robot crashes, which compromises unattended operation in automated laboratory systems.
Innovation Solution
A tip loading assembly with beveled receptacles and wider retainer clips, combined with a stronger biasing member and clamping module, ensures proper tip alignment and retention, enhancing the reliability of the tip loading process and reducing failure modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tight manufacturing tolerances are applied to pipette tips and flats, then manufacturing precision is improved, but device complexity and cost increase without sufficiently resolving alignment issues
Solution Approach 1:
The beveled surface is pre-formed on the receptacle during manufacturing, creating a built-in alignment guide that proactively corrects misalignment before the tip attaches to the pipetter. This preliminary geometric feature eliminates the need for post-manufacturing alignment adjustments and reduces sensitivity to manufacturing tolerances.
Solution Approach 2:
The beveled surface acts as an intermediary element between the receptacle and the pipette tip, mediating the alignment process. As the tip is inserted, the beveled surface guides it into proper alignment, serving as a mechanical mediator that compensates for tolerance variations without requiring tighter manufacturing controls.
2Reliability
If standard retainer clips and biasing members are used, then device complexity is minimized, but tip retention reliability deteriorates under misalignment conditions
Solution Approach 1:
The biasing member is pre-configured to apply continuous force that presses the retainer clips against the pipette tips before attachment occurs. This preliminary retention force ensures tips remain securely held even if misalignment occurs during the attachment process, preventing dropout without requiring complex active control systems.
Solution Approach 2:
The biasing member provides a cushioning retention force that compensates for potential alignment errors and defective tips before they can cause failure. This prior cushioning ensures that even if a tip is slightly misaligned or defective, the retention mechanism maintains secure attachment, preventing system malfunction.
3Stability of the object's composition
If no clamping mechanism is used, then device complexity is reduced, but tip depot positioning stability deteriorates during loading
Solution Approach 1:
The clamping mechanism provides dynamic positioning control, allowing the tip depot to be securely held in the correct position and orientation during the loading process. The clamp can be engaged or disengaged as needed, providing stability when required while maintaining operational flexibility, ensuring consistent tip alignment with the pipetter throughout the attachment process.
Data Source
AI summary
A method of loading a plurality of pipette tips on a plurality of mandrels of a pipetter is provided. A plurality of pipette tips are inserted in a plurality of receptacles of a tip loading assembly. The plurality of pipette tips are oriented with respect to each other by a plate. The tip loading assembly includes, but is not limited to, an insertion surface. The insertion surface includes the plurality of receptacles configured to accept the plurality of pipette tips. A receptacle from among the plurality of receptacles includes a receptacle wall and a beveled surface that extends from at least a portion of the insertion surface. A retention force is applied to the plate. The plurality of pipette tips are attached to a plurality of mandrels of a pipetter and are separated from the plate.