Pipette Disposal Guide with Contact-Reducing Structure
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Solution Overview
Problem
Liquid handling systems face disruptions due to blockages in the pipette disposal guide caused by pipette tips sticking to the chute surface, which requires user intervention to clear.
Innovation Solution
An automated liquid handling system with a pipette tip disposal guide featuring a contact-reducing structure, such as polytetrafluoroethylene (PTFE) rods or a lotus effect structure, to facilitate smooth movement and reduce adhesion of pipette tips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a smooth chute surface is used to guide pipette tips, then the ease of operation is improved, but the reliability deteriorates due to tips sticking and blocking the chute
Solution Approach 1:
The chute surface is modified with PTFE rods that provide a locally different surface property (low friction, non-stick) compared to the rest of the chute structure. This localized quality change allows tips to slide smoothly along the rod surfaces without sticking, while maintaining the overall structural integrity of the chute.
Solution Approach 2:
The friction parameter of the chute surface is changed by introducing PTFE rods with inherently low coefficient of friction. This parameter change transforms the surface from one that causes sticking to one that facilitates smooth sliding, directly addressing the reliability issue while maintaining ease of operation.
2Device complexity
If a simple chute structure is used, then the device complexity is reduced, but the productivity deteriorates due to interruptions from manual clearing
Solution Approach 1:
Rather than redesigning the entire chute structure, the invention applies a localized modification using PTFE rods within the existing chute framework. This approach maintains relatively simple device complexity while dramatically improving productivity by preventing blockages that would require manual intervention.
Solution Approach 2:
The PTFE rod surface provides self-service functionality by automatically preventing tip adhesion through its non-stick properties. This eliminates the need for manual clearing operations, allowing the system to maintain continuous automated operation and thereby improving productivity without adding complex control systems.
3Reliability
If hydrophobic coating is applied to reduce sticking, then the reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
Instead of applying delicate hydrophobic coatings that require high manufacturing precision, the invention uses PTFE rods which inherently possess non-stick properties. The rods can be easily manufactured with standard tolerances and replaced if needed, significantly reducing manufacturing precision requirements while maintaining reliability.
Solution Approach 2:
The chute structure incorporates PTFE material within its composition, utilizing the inherent properties of this composite material to provide both structural support and non-stick surface characteristics. This approach achieves reliability improvement without the need for separate coating processes that would demand high manufacturing precision.
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 contact-reducing structure effectively reduces blockages in the pipette disposal guide, enhancing the efficiency of the liquid handling system by minimizing user intervention and maintaining continuous operation.
Implementation Method 1
The contact-reducing structure comprises a hydrophobic surface
Implementation Method 2
The contact-reducing structure of the major surface comprises a lotus effect structure
Implementation Method 3
the plurality of rods are polytetrafluoroethylene (PTFE) rods
Data Source
AI summary
A pipette tip disposal guide includes an elongated body having an upper first end and an opposite, lower second end, and a major surface extending between the first and second ends, the second end being configured to be positioned adjacent the pipette tip disposal for an automated liquid handling system. The major surface comprises a contact-reducing structure and is configured to receive a pipette tip such that the pipette moves toward the lower second end to the pipette tip disposal.