Miniaturized Microscope with Dual Illumination Channels for Optogenetics
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Solution Overview
Problem
Conventional microscopes are too large for minimally invasive in vivo biological observations and lack the flexibility to perform simultaneous optogenetic stimulation and fluorescence imaging, with existing fiber-optic cannulae limited to optical stimulation without imaging capabilities.
Innovation Solution
A miniaturized multimodal microscope system with an optical cannula that integrates optogenetic stimulation and fluorescence imaging capabilities, using multiple illumination channels and optical filters to separate illumination light from fluorescence signals, allowing for simultaneous or sequential stimulation and imaging, and featuring a compact design for reduced invasiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional microscopes are used for in vivo biological observations, then imaging capability is provided, but the microscope size is too large causing significant damage to the sample and removing structures to facilitate access
Solution Approach 1:
The microscope system is divided into separate functional modules: a miniaturized microscope unit for imaging, and separate fiber-optic cannulae for optogenetic stimulation. This segmentation allows each component to be optimized independently - the microscope remains compact while the cannulae provide targeted stimulation without requiring large invasive structures.
Solution Approach 2:
Optical fibers serve as intermediaries to transmit light for optogenetic stimulation from external sources to the target neurons, eliminating the need for large illuminating structures within the sample. The microscope objective acts as an intermediary to capture fluorescence signals from the same region, enabling simultaneous imaging and stimulation through separate optical pathways.
2Adaptability or versatility
If fiber-optic cannulae are used for optogenetic stimulation, then optical stimulation capability is provided, but imaging capability is lost
Solution Approach 1:
The system combines multiple functions in a single integrated platform: the miniaturized microscope provides fluorescence imaging capability, while separate fiber-optic cannulae provide optogenetic stimulation capability. The dual-band-pass optical filter enables the system to handle both stimulation and imaging wavelengths simultaneously, creating a universal tool for both optical stimulation and imaging experiments.
Solution Approach 2:
The system separates the optical pathways for stimulation and imaging into different spatial dimensions - stimulation light is delivered through dedicated fiber-optic cannulae, while imaging is performed through a separate microscope objective. This dimensional separation allows both functions to operate simultaneously without interference.
3Adaptability or versatility
If multiple illumination channels are used for simultaneous stimulation and imaging, then functional flexibility is improved, but optical interference and cross-talk between modalities occurs
Solution Approach 1:
Different optical filters are applied to different illumination channels: a first optical filter for the stimulation wavelength and a second optical filter for the imaging wavelength. This local differentiation of optical properties allows simultaneous multi-channel operation while preventing spectral interference through wavelength-specific filtering.
Solution Approach 2:
The system uses distinct wavelength parameters for stimulation and imaging, with optical filters tuned to pass only their respective wavelength bands. By changing the wavelength parameter and applying corresponding filters, the system achieves simultaneous operation without optical cross-talk between the two functional channels.
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 precise, minimally invasive optogenetic stimulation and fluorescence imaging with improved image quality and portability, facilitating access to confined regions while maintaining a small size and low weight, and preventing cross-talk between optical modalities.
Implementation Method 1
an optical filter having a dual band-pass transmission spectrum characteristic for filtering the light provided by the illumination sources, so that the transmitting bands correspond to the wavelengths of the illumination sources
Implementation Method 2
The second connector includes one or more optical interfaces for coupling light returning from the sample to the microscope and coupling illumination from the illumination sources to the sample
Data Source
AI summary
A miniaturized microscope provides the combined capability for simultaneous or sequential optogenetic stimulation of light sensitive ion channels with the capability for fluorescence imaging of fluorescent proteins for applications requiring simultaneous optical stimulation and monitoring of cell activity. The microscope includes a dual illumination output coupling for providing illumination to two different regions within the sample and/or two different illumination source inputs and a dual transmission band optical filter to clean two different bands of light that are separately available for optogenetic stimulation and fluorescence imaging.