Thin-Walled Pipette Tips for Weight Reduction and Rigidity
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Solution Overview
Problem
Existing disposable pipette tips are inefficient in material usage and manufacturing, often resulting in bending or crimping issues due to excessive weight, and face challenges with robotic handling and liquid transportation without compromising mechanical integrity.
Innovation Solution
Design and manufacturing of thin-walled pipette tips with reduced resin usage, optimized for injection molding, featuring a thinned distal end for reduced weight and enhanced rigidity, and compatible with existing infrastructure for both manual and robotic use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional thick-walled pipette tips are used, then mechanical strength and rigidity are improved, but material consumption increases and weight causes bending or crimping issues
Solution Approach 1:
The pipette tip employs varying wall thicknesses at different locations: the proximal end has thicker walls for structural support and handling, while the distal end has thinner walls to reduce material consumption and weight. This local differentiation allows the tip to maintain mechanical strength where needed while minimizing resin usage overall.
Solution Approach 2:
The pipette tip is divided into distinct regions with different wall thickness characteristics - a proximal body region with greater wall thickness and a distal end with reduced wall thickness. This segmentation allows each region to be optimized for its specific function: structural integrity at the proximal end and material efficiency at the distal end.
2Loss of substance
If thin-walled design is used, then material consumption is reduced, but mechanical integrity and rigidity deteriorate
Solution Approach 1:
The design implements location-specific wall thickness optimization where the distal end has reduced wall thickness (less than 0.559 mm) to minimize material consumption, while the proximal end maintains adequate thickness for mechanical integrity. This local quality approach ensures material efficiency without compromising overall structural strength.
Solution Approach 2:
The wall thickness parameter is varied along the length of the pipette tip, transitioning from thicker walls at the proximal end to thinner walls at the distal end. This parameter change allows the structure to achieve both material efficiency and mechanical integrity by optimizing the thickness parameter for different functional requirements.
3Ease of manufacture
If uniform wall thickness is used, then manufacturing simplicity is maintained, but weight distribution causes bending issues
Solution Approach 1:
Rather than using uniform wall thickness, the design implements local quality variations with reduced wall thickness at the distal end. This creates a weight distribution that prevents bending and crimping while maintaining manufacturability through injection molding processes that can accommodate variable thickness designs.
4Strength
If heavy pipette tips are used, then structural robustness is improved, but operator fatigue increases
Solution Approach 1:
The proximal end of the pipette tip maintains adequate wall thickness to provide structural robustness for handling and attachment, while the distal end uses thinner walls to reduce overall weight. This local differentiation achieves structural robustness where needed while minimizing weight to reduce operator fatigue during repetitive pipetting operations.
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 thin-walled design reduces material consumption by 40% while maintaining mechanical robustness, improving tip straightness, reducing operator fatigue, and enhancing compatibility with automated systems without compromising structural integrity or liquid handling precision.
Implementation Method 1
A method of making a pipette tip comprises injecting a suitable polymer into a single or multiple cavity mold
Data Source
Figure 1~2
Figure 3A~5
Figure 6A~6D
AI summary
A pipette tip includes a proximal end having an aperture and a proximal body region having a first internal cavity that receives a pipette member, and a distal end having an aperture and a distal body region having a second internal cavity that in operation receives and discharges a liquid aspirated by the pipette member, where the ratio of the proximal half weight of the pipette tip to the distal half weight of the pipette tip normalized to the total weight of the pipette tip has a value, defined as a thinning constant, wherein the pipette tip has a wall thickness of less than 0.022 inches over the distal region.