Micromanipulator Parallel Drive Stems Gravity Compensation
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Solution Overview
Problem
Current micromanipulator systems are clumsy, large, and lack accuracy, often experiencing tool position drift over time, which is exacerbated by factors like gravity and friction, making them unsuitable for precise biomedical applications such as IVF and electrophysiology.
Innovation Solution
A micromanipulator arrangement with multiple parallel drive stems and a force-generating unit, such as a constant-force spring, to compensate for additional factors affecting the movable element's position, combined with a controller unit for electronic compensation and wireless control, allowing for precise and stable movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple piezoelectric drives are combined to manipulate the tool in multiple directions, then the positioning accuracy is improved, but the device size and complexity increase
Solution Approach 1:
The patent combines multiple drive stems (first and second drive stems) into a single integrated micromanipulator element that shares common structural components. The movable element is simultaneously supported by both drive stems, merging their functions into a unified structure that reduces overall complexity while maintaining multi-directional positioning capability
Solution Approach 2:
The parallel drive stem arrangement serves multiple functions: it provides linear actuation, acts as a linear guide preventing rotation and misplacement, and supports the movable element in multiple directions. This multi-functionality eliminates the need for separate linear guide components, reducing device complexity while improving positioning accuracy
2Measurement precision
If multiple piezoelectric drives are combined to manipulate the tool in multiple directions, then the positioning accuracy is improved, but the device size increases
Solution Approach 1:
The patent merges the first and second drive stems into a compact parallel arrangement where both stems share common mounting structures and support the movable element simultaneously. This integration reduces the overall volume required compared to separate drive mechanisms, enabling high positioning accuracy in a compact device size
3Ease of operation
If traditional micromanipulator systems are used, then the tool can be manipulated, but significant drift of the tool position over time occurs due to gravity and friction
Solution Approach 1:
The patent introduces a force-generating unit that produces a compensating force to counteract the effects of gravity and friction on the movable element. This counterbalancing mechanism maintains position stability over time by offsetting the gravitational pull and frictional forces that would otherwise cause drift, while preserving full tool manipulation capability
Solution Approach 2:
The patent implements a control unit that monitors the position of the movable element and adjusts the drive signals to compensate for drift caused by gravity and friction. This feedback mechanism detects position deviations and corrects them in real-time, ensuring reliable position stability while maintaining ease of tool manipulation
4Measurement precision
If piezoelectric drives are used to provide precise manipulation, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The patent employs piezoelectric drives that operate through periodic oscillation rather than continuous power application. The piezoelectric elements are excited with alternating current signals that create back-and-forth motion, allowing the movable element to be positioned precisely with minimal average power consumption, as power is only applied during the oscillation cycles needed for positioning adjustments
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 solution enables a compact, accurate, and reliable micromanipulator system that reduces power consumption and operates wirelessly, providing homogeneous movement and improved positioning control, even in limited spaces, thus enhancing the precision and reliability of biomedical experiments.
Implementation Method 1
Actuators utilizing micromechanical principles such as piezoelectric drive provide for advantages in biosciences, where precise manipulation of microscopic tools is needed. The piezoelectric principle allows to control the position of a tool attached to a movable element on a piezoelectric drive
Implementation Method 2
the first micromanipulator element is mounted on a moving part of the second micromanipulator element, wherein said at least one micromanipulator element is a piezoelectric element or a magnetostrictive element
Implementation Method 3
A micromanipulator arrangement with multiple parallel drive stems and a force-generating unit, such as a constant-force spring, to compensate for additional factors affecting the movable element's position
Data Source
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AI summary
The invention relates to a micromanipulator arrangement comprising at least one drive stem (120, 821), at least one movable element (130, 320, 360) arranged on the drive stem (120, 821) to move along the drive stem (120, 821 ) wherein the drive stem (120, 821) being arranged to cause a change in a position of the movable element (130, 320, 360) with respect to the drive stem (120, 821); wherein an additional factor exists having an effect in the change of the position of the movable element and the micromanipulator arrangement further comprises means (870) for compensating said additional factor such that said effect is diminished.