Multi-channel pipettor safety switch for tip attachment
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Solution Overview
Problem
Manual multi-channel pipetting systems face challenges in efficiently attaching disposable pipette tips due to the high cumulative insertion force required, which can lead to user safety issues and potential damage during tip attachment, especially when handling large arrays like 96-tip fittings.
Innovation Solution
A manually directed, electronic multi-channel pipetting system with a motorized vertical drive mechanism and a safety switch that detects unexpected resistance, allowing for controlled tip attachment by overriding the safety trigger and using a separate button for initiating tip attachment, ensuring the user's hands are not in harm's way, and incorporating a check processor to prevent unintended motion through separate servo control loops and Hall-effect sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a motorized vertical drive mechanism is used to generate high force for simultaneous insertion of 96 pipette tips, then tip attachment efficiency is improved, but user safety deteriorates due to risk of unintended motion and injury
Solution Approach 1:
A safety switch provides feedback about the state of the vertical drive mechanism to the control system. When the safety switch detects unexpected resistance or abnormal conditions during tip attachment, it sends a signal to the control system to immediately stop the motor, preventing unintended motion and user injury while allowing efficient tip attachment under normal conditions
Solution Approach 2:
The safety switch acts as an intermediary between the vertical drive mechanism and the control system. It monitors the attachment process and mediates between the high-force motorized drive and the user safety requirement by triggering a stop condition when abnormal resistance is detected, thus protecting the user while enabling efficient operation
2Reliability
If the vertical drive mechanism exerts high force for tip attachment, then attachment reliability is improved, but unintended motion and potential damage increase
Solution Approach 1:
The safety switch is configured to detect unexpected resistance before unintended motion can cause damage. By anticipating abnormal conditions during the high-force attachment process, the safety switch triggers a preventive stop that counteracts potential harmful motion before it occurs, ensuring attachment reliability while preventing damage
3Object-affected harmful factors
If a safety switch is implemented to detect unexpected resistance, then user safety is improved, but system complexity increases
Solution Approach 1:
The safety function is extracted as a separate, dedicated safety switch component rather than being integrated into the main control system. This modular approach improves user safety by providing dedicated monitoring while minimizing system complexity by keeping the safety mechanism independent and simple
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 system effectively manages the high force required for tip attachment while ensuring user safety and preventing motor malfunctions, allowing for precise and safe attachment of multiple pipette tips without excessive force during normal operations, thus enhancing operational reliability and safety.
Implementation Method 1
separate servo control loops and Hall-effect sensors
Data Source
AI summary
A manually directed, electronic multi-channel pipettor uses servo controlled motors to drive a carriage and pipetting head in response to a user's manipulation of a control handle. The pipetting head include an array of tip fittings, e.g. 96. The system includes a check processor to avoid unintended motion in case of system faults or crashes. The system requires substantial force to attach the array of tips, and therefore includes controls that require both of the user's hands be occupied during the tip attachment process.