Laser microdissection system based on structured light modulation dual cutting mode and negative pressure adsorption...

Area of Science:

• Biomedical Engineering
• Cellular Biology
• Microscopy and Imaging

Background:

• Existing laser microdissection (LMD) systems face challenges with mechanical accuracy, leading to suboptimal cutting quality.
• Current LMD target acquisition methods can cause tissue damage and reduced efficiency due to capture method limitations.

Purpose of the Study:

• To enhance the precision and efficiency of cellular tissue separation and capture in laser microdissection.
• To overcome the limitations of traditional point scanning and single-target capture methods in LMD.

Main Methods:

• Integrated a digital micromirror device (DMD) into LMD optics to modulate spatial light, enabling both point scanning and projection cutting methods.
• Utilized a negative pressure adsorption method for efficient collection of target substances.
• Tested cutting and capture capabilities on PET films and mouse tissues.

Main Results:

• Achieved precise cutting of specialized shapes (7.5 micrometers diameter) in a single pass using projection cutting mode, improving precision and efficiency.
• Demonstrated a single-pass capture rate exceeding 90% for various target sizes using negative pressure adsorption.
• Enabled simultaneous capture of multiple targets, significantly enhancing overall capture efficiency and minimizing tissue damage.

Conclusions:

• The integration of DMD technology substantially improves cutting precision and capture efficiency in laser microdissection systems.
• This advancement offers a more accurate and effective method for isolating and capturing biological tissues, with significant potential for medical research and applications.