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Optimal parameters for laser tissue soldering: II. Premixed versus separate dye-solder techniques
K M McNally1, B S Sorg, E K Chan
1Centre for Lasers and Applications, School of MPCE, Macquarie University, NSW 2109, Australia.
Lasers in Surgery and Medicine
|May 11, 2000
Summary
A new laser tissue soldering method using indocyanine green (ICG) dye and protein solder improved bond stability during hydration. This technique offers enhanced shelf-life for surgical applications.
Area of Science:
- Biomedical Engineering
- Materials Science
- Surgical Innovation
Background:
- Laser tissue soldering utilizes indocyanine green (ICG)-doped protein solder denatured by a diode laser.
- Previous work established ICG concentration as the primary determinant of light absorption depth.
Purpose of the Study:
- To investigate an alternative laser tissue soldering technique limiting heat generation to the solder-tissue interface.
- To determine if this method achieves more stable solder-tissue fusion in vitro.
Main Methods:
- A novel technique involved applying a thin layer of ICG dye followed by protein solder, denatured by an 808-nm diode laser.
- Tensile strength and scanning electron microscopy analyses compared this separate dye-solder technique with conventional premixed methods.
- The effect of hydration on bond stability was assessed for both techniques.
Main Results:
- Both techniques yielded comparable tensile strengths, with the separate dye-solder method showing greater stability during hydration.
- Native bovine thoracic aorta tensile strength was measured at 596 +/- 31 N/cm(2).
- The separate dye-solder technique enhanced solder shelf-life by mixing ICG at the time of use.
Conclusions:
- Two laser-assisted tissue soldering techniques for in vitro aorta repair were evaluated.
- The separate dye-solder method demonstrated improved bond stability under hydration.
- Each technique presents distinct advantages and disadvantages for surgical applications.