Ultrafast Microtome with Oscillating Flexure Assemblies
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Solution Overview
Problem
Existing microtomes are limited by low operation frequency and parasitic blade motions, which hinder precise sectioning of soft tissues and organs, especially in emerging imaging techniques like expansion microscopy and tissue optical clearing, as they fail to effectively slice tissues at suitable temperatures without chemicals.
Innovation Solution
An ultrafast microtome design featuring a support assembly, oscillating flexure assemblies, and a blade assembly, with active vibration control using sensors and actuators to suppress parasitic motions and achieve high-frequency oscillation (5-500 Hz) for improved sectioning, employing symmetric flexure mechanisms and dummy structures to cancel dynamic forces and torques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the operation frequency is increased beyond 200 Hz to improve sectioning results, then the sectioning quality is improved, but parasitic blade motions increase making it difficult to maintain precision within 1 micron
Solution Approach 1:
The patent employs counterweight structures and symmetric flexure assemblies to balance the dynamic forces generated during high-frequency blade oscillation. The symmetric design of the flexure assemblies creates opposing forces that cancel out parasitic blade motions, enabling operation frequencies beyond 200 Hz while maintaining precision within 1 micron.
Solution Approach 2:
The patent uses asymmetric counterbalancing mechanisms to compensate for the dynamic forces generated during oscillation. By strategically positioning counterweights and adjusting the asymmetric properties of the flexure assemblies, the system cancels out unwanted blade motions while maintaining the desired oscillation frequency and amplitude.
2Adaptability or versatility
If conventional microtomes are used to section soft tissues at suitable temperatures without chemicals, then the tissues remain viable for imaging, but the cutting frequency is limited to 60 Hz resulting in poor sectioning quality
Solution Approach 1:
The patent transitions from static blade mechanisms to dynamic oscillating blade mechanisms operating at high frequencies (5-500 Hz). The oscillating blade assembly, supported by flexible flexure assemblies, enables the blade to vibrate at frequencies that exploit the viscoelastic properties of soft tissues, achieving effective sectioning without chemical hardening while maintaining tissue viability.
Solution Approach 2:
The patent utilizes mechanical vibration at high frequencies to section soft tissues. The oscillating blade, driven by actuators and supported by flexible flexure assemblies, vibrates at frequencies that cause the tissue to stiffen locally during the cutting process. This vibration-based approach enables cutting of soft, living tissues without chemical treatment, maintaining tissue viability for subsequent imaging.
3Manufacturing precision
If the blade oscillation frequency is increased to locally stiffen tissues and maximize stress concentration, then sectioning results are improved, but the global deformation in tissues increases
Solution Approach 1:
The patent applies local quality enhancement by using high-frequency oscillation to locally stiffen only the specific region of tissue being cut. The oscillating blade creates a localized stiffening effect at the cutting interface through viscoelastic heating and stress concentration, while the rest of the tissue remains soft and flexible. This localized approach allows precise sectioning without causing global deformation of the entire tissue sample.
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 ultrafast microtome achieves precise sectioning with minimal parasitic motion (<1 micron) across a wide frequency range, enabling high-quality tissue sectioning for advanced imaging applications, including super-resolution imaging and tissue optical clearing, with improved tissue stiffness and reduced deformation.
Implementation Method 1
a pair of oscillating flexure assemblies, held by the support assembly and each of which being located on one side of the actuator and oscillated by the actuator
Implementation Method 2
measuring, with a sensor, motions and forces of each of the oscillating flexure assemblies on both sides and generating a signal about the motions and the forces
Implementation Method 3
adjusting, with a power amplifier, the actuator according to the desired driving force
Data Source
AI summary
A microtome comprises a support assembly; an actuator, mounted to the support assembly; a pair of oscillating flexure assemblies, held by the support assembly and each of which being located on one side of the actuator and oscillated by the actuator; and a blade assembly, mounted to each of the oscillating flexure assemblies so as to move in a direction same as the oscillating flexure assemblies.