Biological Cell Fixation via Laser Irradiation
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Solution Overview
Problem
Conventional fixation methods for biological specimens often disrupt the structure and composition of cellular components, require hazardous chemicals, and can alter sample properties over several hours, making them inefficient and unsafe.
Innovation Solution
The use of optical irradiation with electromagnetic radiation, including visible, ultraviolet, and infrared wavelengths, to rapidly fix biological specimens, allowing for controlled and limited fixation of specific regions while maintaining the sample's natural state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chemical fixation methods are used, then the sample can be preserved, but the structure and composition of cellular components are disrupted
Solution Approach 1:
The patent replaces chemical fixation mechanisms with optical irradiation (laser-based electromagnetic radiation). Instead of using chemical crosslinking or precipitation, the system uses controlled light exposure to induce fixation through photochemical reactions in endogenous chromophores, thereby preserving cellular structure while achieving fixation.
Solution Approach 2:
The patent changes the fundamental parameter of fixation from chemical concentration/exposure to optical dose (intensity × time). By controlling the wavelength, intensity, and duration of laser irradiation, the system achieves fixation without the disruptive chemical effects, allowing preservation of both structure and composition.
2Reliability
If conventional fixation methods are used, then the sample can be fixed, but the process takes several hours causing structural alterations
Solution Approach 1:
The patent replaces time-intensive chemical diffusion and reaction processes with rapid optical irradiation. The laser-based system delivers fixation energy directly and uniformly throughout the sample volume simultaneously, reducing fixation time from hours to minutes or seconds while maintaining effectiveness.
Solution Approach 2:
The patent employs continuous or pulsed laser irradiation that acts uniformly throughout the entire sample volume simultaneously, rather than relying on slow diffusion of chemical fixatives. This continuous optical action achieves complete fixation much faster than sequential chemical processing.
3Reliability
If conventional chemical fixatives are used, then the sample can be preserved, but hazardous chemicals must be handled
Solution Approach 1:
The patent replaces hazardous chemical fixatives with optical irradiation as the fixation mechanism. The laser system uses electromagnetic radiation in the visible to near-infrared range, eliminating exposure risks from toxic chemicals like formaldehyde, glutaraldehyde, or alcohol while maintaining preservation effectiveness.
Solution Approach 2:
The patent extracts and removes all hazardous chemical substances from the fixation process. By using endogenous chromophores (natural light-absorbing molecules in cells) as the target for optical fixation, the system eliminates the need for external chemical fixatives entirely, creating a safe fixation method.
4Reliability
If conventional fixation methods are used, then the entire sample can be fixed, but all regions are exposed uniformly without selective control
Solution Approach 1:
The patent enables different regions of the sample to receive different optical doses by controlling laser scanning patterns, beam focusing, or exposure timing. This allows selective fixation of specific areas or layers while leaving other regions unfixed or differently fixed, providing spatial control impossible with uniform chemical immersion.
Solution Approach 2:
The patent divides the sample into multiple regions that can be fixed independently through controlled laser scanning or focal positioning. Each region can be exposed to optical irradiation separately, allowing sequential or selective fixation of different sample portions while maintaining the ability to process them differently.
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 method achieves rapid fixation in seconds to minutes, preserving the sample's morphology and reactivity, reducing the need for hazardous chemicals and enabling multi-time point studies with improved mechanical stability and safety.
Implementation Method 1
The fixation source configured to emit electromagnetic radiation having a wavelength along the light pathway
Implementation Method 2
Biological cell and tissue fixation by laser irradiation
Data Source
AI summary
Systems and methods of fixing biological cells by laser irradiation. A method according to one embodiment of the present invention includes positioning a sample (of the cell or tissue) in a light pathway of a fixation source. The fixation source configured to emit electromagnetic radiation having a wavelength along the light pathway. The sample is exposed to the electromagnetic radiation for an exposure time.