Millimeter Wave Cell Damage via Waveguide
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Solution Overview
Problem
Existing methods for selective hyperthermic damage of target cells in cell cultures, such as laser ablation and infrared radiation, are inefficient, harmful to desired cells, require expensive equipment, and cannot be performed manually with standard microscopes, and infrared radiation poses a safety risk due to its inability to be detected by the human eye.
Innovation Solution
The use of millimeter wave radiation, absorbed by water in the culture medium, to selectively heat and irreversibly damage unwanted cells through a waveguide, allowing for precise control of temperature and exposure time, and compatibility with standard microscopes, ensuring safety for operators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser ablation is used to eliminate unwanted cells, then selective cell damage is achieved, but free radicals and oxidation products are formed that harm desired cells
Solution Approach 1:
The patent converts the harmful effect of laser ablation (free radical formation) into a beneficial selective heating process by using millimeter waves that are selectively absorbed by water in the culture medium. This approach targets unwanted cells through their water content without generating harmful chemical byproducts, thereby eliminating the harmful factors while maintaining selectivity.
Solution Approach 2:
The patent replaces the chemical/mechanical damage mechanism of laser ablation with a thermal field mechanism. Instead of using high-power laser beams that generate free radicals, the invention uses millimeter wave radiation that penetrates the culture medium and selectively heats water molecules, causing thermal damage without chemical byproducts.
2Temperature
If infrared radiation is used for cell ablation, then heating effect is achieved, but the radiation is strongly absorbed by glass, plastic and water causing non-selective heating of cultureware and medium
Solution Approach 1:
The patent changes the frequency parameter of the radiation from infrared to millimeter waves. This parameter change allows the radiation to penetrate glass, plastic, and water without being strongly absorbed, enabling selective heating of specific regions within the culture medium rather than heating the entire cultureware and medium uniformly.
Solution Approach 2:
The patent uses millimeter waves as an intermediary that can penetrate through the cultureware materials (glass, plastic) and water to reach the cells. This intermediary radiation type allows energy transfer without being blocked by the intervening materials, achieving selective heating while avoiding non-selective heating of the cultureware.
3Reliability
If intense infrared radiation is applied to cell cultureware, then cell ablation is achieved, but the radiation is dangerous for vision as it can pass through the eye and reach the retina without detection
Solution Approach 1:
The patent changes the spectral characteristics of the radiation from invisible infrared to millimeter waves that are also invisible to the human eye but with different penetration properties. While both are invisible, millimeter waves are reflected or blocked by the cornea and lens, preventing them from reaching the retina, thus solving the eye safety problem while maintaining cell ablation effectiveness.
4Reliability
If laser-based methods are used for cell elimination, then selective damage is achieved, but special expensive equipment and precise laser optics adjustment are required
Solution Approach 1:
The patent replaces expensive, complex laser equipment with simpler, more affordable millimeter wave sources that can be integrated with standard microscopes. The millimeter wave system uses readily available components and does not require precise optical alignment or specialized laser optics, reducing equipment cost and complexity while maintaining selective cell damage capability.
Solution Approach 2:
The patent makes the millimeter wave system universally compatible with standard microscopes and cell cultureware, allowing it to be used in existing laboratories without requiring specialized equipment. This multi-functionality enables the same system to work with various cell types and culture conditions, reducing the need for multiple specialized devices.
5Reliability
If laser microdissection is used to separate cells, then physical separation is achieved, but the method is not sterile and requires special consumables
Solution Approach 1:
The patent converts the non-sterile nature of laser microdissection into a beneficial selective thermal damage process. By using millimeter waves that are selectively absorbed by water in unwanted cells, the method achieves cell elimination through thermal damage without requiring physical contact or special consumables, thereby maintaining sterility while simplifying the procedure.
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
Achieves selective and irreversible damage of target cells at controlled temperatures (58-60°C) within seconds, avoiding harm to surrounding cells and equipment, and can be performed manually with standard microscopes, enhancing safety and efficiency in clinical and research applications.
Implementation Method 1
millimeter wave radiation is used... that have water penetration depth of about 0.4 mm (W-band from 75 to 110 GHz)... The millimeter waves are guided to the cell cultureware via a special waveguide that provides a localized irradiation spot... Millimeter waves rapidly heat a narrow layer (about 0.4 mm or less) of a media volume comprising unwanted cells
Implementation Method 2
millimeter wave radiation... that have water penetration depth of about 0.4 mm... The millimeter waves are guided to the cell cultureware via a special waveguide... Millimeter waves rapidly heat a narrow layer (about 0.4 mm or less) of a media volume
Implementation Method 3
The millimeter waves are guided to the cell cultureware via a special waveguide that provides a localized irradiation spot of a controllable size
Implementation Method 4
The cells locally heated by millimeter wave radiation even for a short time are irreversibly damaged, as mammalian cells in culture medium or in tissues do not survive if exposed to temperatures exceeding 48-50° C. even for a short time interval (less than 1 minute)... Higher temperatures (about 58-60° C.) sharply shorten the critical exposure time required to kill the cells by heating to less than 2-3 seconds. Such a short time to achieve cell death at 58-60° C. is attributed to the fast and irreversible denaturation of cell proteins
Data Source
AI summary
Device and method for selective hyperthermic damage of target cells by means of millimeter wave radiation. Cells in a culture medium are placed in a cell cultureware and millimeter wave radiation is delivered via a waveguide to a predetermined region of exposure of the culture medium. The device and method are safe and efficient for use in clinical and research applications.