Single Pipette Tip Mixing With Real-Time Fluid Analysis

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Solution Overview

Problem

Current fluid mixing methods in laboratories are resource-intensive, prone to errors, unsafe, and lack real-time monitoring, leading to incomplete data due to the need for multiple pipette tip changes and separate analysis steps.

Innovation Solution

A method that combines fluid mixing and analysis in a single pipette tip, allowing direct fluid transfer and real-time monitoring using an analytical element, eliminating the need for separate containers and reducing errors through automated pipetting devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple pipette tips are used for different fluid transfer steps, then sterile working conditions are maintained, but resource consumption and time expenditure increase

Engineering Contradiction:

Improvesterile working conditionsVSAvoidresource efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The single pipette tip is segmented into functionally distinct zones: a sterile tip portion for fluid aspiration/discharge and a non-sterile shaft portion for holding and handling. This segmentation allows the tip to serve multiple functions while maintaining sterility where required

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The single pipette tip is designed to perform multiple functions: transferring first fluid, transferring second fluid, and serving as the mixing chamber. This multi-functionality eliminates the need for multiple separate tips and containers, reducing resource consumption while maintaining operational efficiency

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If pipette tips are changed after each fluid transfer, then contamination is prevented, but the process becomes time-consuming and resource-intensive

Engineering Contradiction:

Improvecontamination preventionVSAvoidtip replacement time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The pipette tip is segmented into a sterile tip portion that contacts fluids and a non-sterile shaft portion that does not. This allows the tip to remain in place for multiple operations while maintaining sterility in the critical fluid-contact zone

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The mixing chamber is prepared in advance within the pipette tip by introducing the second fluid before the first fluid is added. This preliminary preparation eliminates the need for intermediate tip changes and allows continuous operation

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If fluids are mixed in a separate container, then mixing can occur, but real-time monitoring of the mixing process is not possible

Engineering Contradiction:

Improvemixing capabilityVSAvoidreal-time data

Core Design Contradiction:

Ease of operationVSLoss of information

Solution Approach 1:

The mixing chamber and analysis chamber are merged into a single integrated space within the pipette tip. This allows the mixing process and analytical monitoring to occur simultaneously in the same location, enabling real-time observation of mixing without requiring separate containers or transfer steps

Inventive Principle:

Principle #5Merging (Combining)

4Ease of operation

If multiple separate containers are used for fluid transfer and mixing, then fluid handling is simplified, but the number of transfer steps increases error risk

Engineering Contradiction:

Improvefluid handlingVSAvoidmeasurement accuracy

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The pipette tip integrates multiple functions that would otherwise require separate containers: fluid aspiration, fluid holding, mixing chamber, and analysis chamber. This consolidation reduces the number of transfer steps between containers, minimizing opportunities for error while maintaining ease of operation through automated pipetting

Inventive Principle:

Principle #5Merging (Combining)

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

This approach enhances resource efficiency, safety, and accuracy by minimizing waste, reducing transfer steps, and enabling continuous data collection during the mixing process.

Implementation Method 1

The movement of a pump element creates a vacuum in the pipette tip, causing the liquid to rise into the tip

Methodology Applied

Scientific EffectVacuum: Vacuum

Implementation Method 2

Some pipettes exist that operate on the air cushion principle. A corresponding pipetting device is known, for example, from DE10237770A1. In this device, an air column separates the liquid drawn into the pipette tip from the interior of the pipette.

Methodology Applied

Scientific EffectAir cushion principle: Air Lubrication

Implementation Method 3

The air column moved by the pump element creates a fluid flow, which in turn moves the liquid into and out of the pipette tip

Methodology Applied

Scientific EffectFluid flow: Convection

Data Source

PatentEP4700391A1Method for mixing fluids, and pipetting device

Publication Date: 2026.02.25 HOMBRECHTIKON SYST ENG AG

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AI summary

Method for mixing fluids, comprising the following steps: providing a pipette tip (1) for receiving a fluid, receiving a first fluid (8) into the pipette tip (1), receiving a second fluid (9) into the pipette tip (1), and mixing and analyzing the first (8) and second fluid (9) in the pipette tip (1), and pipetting apparatus.