Heated Stage Assembly for Fluorescence Microscopy

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Solution Overview

Problem

Current stage heaters in microscopy systems suffer from uneven heat distribution, risk of damaging the objective lens, potential contamination, and reduced light transmission, especially when heating specimens to high temperatures above 37 degrees Celsius, such as 40 degrees Celsius or higher.

Innovation Solution

A heated stage assembly with a mounting adapter element, sample holder element, and optical window holder element that includes heating elements and a transparent optical window for uniform heat distribution to the specimen, while insulating the objective lens and allowing for sterile and chemically non-reactive heating, using materials like polyoxymethylene for insulation and metals for conductivity, and temperature sensors with PID controllers for precise temperature control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a stage heater is used to heat the specimen, then the specimen temperature can be raised to desired levels, but the heat distribution becomes uneven and the objective lens may be damaged

Engineering Contradiction:

Improvespecimen temperatureVSAvoidobjective lens safety

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The heating system is segmented into multiple independent heating elements positioned at different locations (center and perimeter) of the stage, allowing independent control of heat application zones to achieve uniform temperature distribution while preventing overheating of the objective lens

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the stage receive different heating intensities through selectively positioned heating elements, with the center region receiving heat from one set of elements and the perimeter from another, creating locally optimized heat distribution that prevents thermal damage to the objective lens while maintaining specimen temperature

Inventive Principle:

Principle #3Local quality

2Use of energy by moving object

If the stage heater is mounted directly against the slide, then heating efficiency is improved, but the specimen may be contaminated or damaged by chemical reactions

Engineering Contradiction:

Improveheating efficiencyVSAvoidspecimen contamination

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

A transparent, chemically inert window material is introduced as an intermediary between the heating elements and the specimen slide, allowing thermal energy to pass through while preventing direct contact between the heater and specimen, thus eliminating contamination risks while maintaining heating efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The heating system operates through a chemically inert transparent window that creates a barrier environment, preventing any chemical reactions or contamination between the heating mechanism and the specimen while allowing thermal energy transfer

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

3Temperature

If conventional stage heaters are used, then heating capability is provided, but light transmission is reduced due to reflection and scattering

Engineering Contradiction:

Improvespecimen heating capabilityVSAvoidlight transmission

Core Design Contradiction:

TemperatureVSIllumination intensity

Solution Approach 1:

A transparent window serves as an intermediary material that allows light to pass through with minimal reflection or scattering while still permitting thermal energy transfer from the heating elements to the specimen, thus maintaining both heating capability and optimal light transmission for fluorescence microscopy

Inventive Principle:

Principle #24Intermediary (Mediator)

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 uniform heating of specimens up to 70 degrees Celsius, protecting the objective lens and maintaining high-quality imaging by ensuring even heat distribution and sterility, while preventing thermal gradients and optical degradation.

Implementation Method 1

The stage heater includes one or more heating elements

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

The mounting adapter element insulates the objective from the heat

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 3

The sample holder element transmits the heat to both the slide and the optical window element

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentEP3850417B1Heated stage assembly for high temperature fluorescence microscopy

Publication Date: 2025.01.01 UNIV OF MASSACHUSETTS

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AI summary

The invention is directed to a heated stage assembly that can achieve high temperatures (i.e., 40 degrees Celsius and higher and more specifically, 55 degrees Celsius and higher) for use in microscopy including fluorescence microscopy. The microscope stage heater assembly includes a mounting adapter element, a sample holder element mounted within the mounting adapter element, one or more heating elements attached to the sample holder element, and an optical window holder element disposed on a surface of the sample holder element that encloses an optical window element. The optical window element may be in contact with a microscope sample such that the optical window element is heated by the sample holder element to uniformly distribute heat to the specimen.