Microstructure Propulsion Element Deformation Steering
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Solution Overview
Problem
Existing micro-medical devices face challenges in propelling and steering within fluid environments, particularly in minimally-invasive surgeries, due to the need for accurate three-dimensional movement in heterogeneous and sensitive environments with low Reynolds numbers, without causing damage.
Innovation Solution
A device comprising a propulsion element with deformable portions and guide elements, utilizing active materials to generate rotations about multiple axes, coordinated with deformations, allowing for precise control and movement of microstructures like microrobots or flexible tubes in fluid environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional propulsion systems are used in micro-medical devices, then the device can achieve basic movement, but the steering accuracy and three-dimensional control precision deteriorate in low Reynolds number fluid environments
Solution Approach 1:
The propulsion element is divided into multiple deformable portions (first deformable portion, second deformable portion) that can independently deform and rotate about different axes. This segmentation allows precise three-dimensional steering control by coordinating the deformation of each segment, achieving high positioning accuracy without requiring an overly complex overall system structure.
Solution Approach 2:
The propulsion element incorporates dynamic deformation capabilities where the deformable portions can change shape and rotation angle in real-time based on control signals. This dynamic adaptability enables the microstructure to achieve precise steering and positioning in complex fluid environments by adjusting its configuration on-the-fly rather than relying on fixed mechanical steering components.
2Speed
If the propulsion element deforms in elongation/contraction to generate propulsion, then the microstructure achieves forward movement, but the ability to rotate about transverse axes for steering is limited
Solution Approach 1:
The deformable portions of the propulsion element serve multiple functions: they generate propulsion through elongation/contraction deformation while simultaneously enabling rotation about transverse axes when selectively actuated. This multi-functionality allows a single structural element to provide both forward movement and steering control, eliminating the need for separate propulsion and steering mechanisms.
Solution Approach 2:
The propulsion element extends beyond one-dimensional elongation/contraction by incorporating rotational degrees of freedom about transverse axes. The deformable portions can deform in multiple dimensions - primarily along the main axis for propulsion, and additionally about transverse axes for steering - thereby adding dimensional versatility to the propulsion mechanism.
3Adaptability or versatility
If multiple guide elements are added to enable rotation about multiple axes, then three-dimensional steering is achieved, but the device complexity and energy consumption increase
Solution Approach 1:
The guide elements are merged with the propulsion element structure itself rather than being separate components. The deformable portions of the propulsion element directly provide both propulsion and steering functions, eliminating the need for distinct guide elements and reducing overall system complexity and energy requirements for multi-axis control.
Solution Approach 2:
The propulsion element's deformable portions serve themselves by providing both propulsion and steering functions through coordinated deformation. The same structural elements that generate forward movement also enable rotation about transverse axes, allowing the system to achieve three-dimensional steering without requiring additional dedicated steering components that would consume extra energy.
4Object-affected harmful factors
If the microstructure is made smaller to minimize damage in sensitive environments, then the invasiveness is reduced, but the propulsion and steering control precision deteriorates
Solution Approach 1:
The system maintains small physical dimensions while achieving high positioning accuracy by changing the control parameters - using precise control of deformation amounts and rotation angles of the deformable portions. This allows a small microstructure to achieve positioning precision comparable to or exceeding its own size through sophisticated control of its deformable components rather than relying on large physical dimensions.
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
Enables reliable and accurate propulsion and steering of microstructures in three dimensions within fluid environments, maintaining environmental integrity and achieving efficient movement in low Reynolds number fluids.
Implementation Method 1
at least two guide segments based on an active material reversibly deformable under the effect of an energy supply by a respective connection to an energy source, each guide segment being adapted to generate by the deformation thereof, under the effect of an energy supply, a rotation of the propulsion element about an axis of rotation transverse to the main axis of the propulsion element
Implementation Method 2
a propulsion element including at least one portion deformable in elongation/contraction according to a main axis connecting a front portion and a rear portion of the propulsion element
Data Source
AI summary
This device includes a propulsion element including at least one portion deformable in elongation/contraction according to a main axis (X2) connecting a front portion and a rear portion. At least two guide elements adapted to generate, under the effect of an energy supply, a rotation of the propulsion element respectively about a first axis of rotation and about a second axis of rotation transverse to each other and to the main axis (X2) of the propulsion element. A control unit configured to actuate a rotation of the propulsion element about at least one axis transverse to the main axis (X2) in a coordinated manner with a deformation of the deformable element of the propulsion element in elongation/contraction according the main axis (X2).