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Optimal solder and power density for diode laser tissue soldering (LTS)
C S Cooper1, I P Schwartz, D Suh
1Division of Pediatric Urology, Children's Hospital of Philadelphia, The University of Pennsylvania School of Medicine, Philadelphia, PA, 19104, USA. christopher-cooper@uiowa.edu
Lasers in Surgery and Medicine
|August 14, 2001
Summary
Power density, not indocyanine green dye (ICG) concentration, is key for laser tissue soldering (LTS) temperature control. Optimal wound closure with ICG-albumin solder requires specific power density settings for effective healing.
Area of Science:
- Biomedical Engineering
- Surgical Technology
- Materials Science
Background:
- Laser tissue soldering (LTS) with albumin and indocyanine green dye (ICG) is a valuable surgical technique.
- Understanding temperature and tensile strength is crucial for optimizing LTS.
Purpose of the Study:
- To evaluate in vivo and in vitro temperature profiles of albumin-based solder.
- To assess immediate and short-term tensile strength and histology of LTS-closed wounds.
- To determine the influence of ICG concentration and laser power density (PD) on LTS outcomes.
Main Methods:
- ICG concentrations (0.31–20 mg/mL) and PD (3.2–63.7 W/cm²) were varied.
- Solder and dermal temperatures were measured during laser activation.
- Rat dorsal skin incisions were closed using LTS, followed by tensile strength testing and histological examination.
Main Results:
- Solder temperature varied significantly with PD, while ICG concentration had minimal effect except at 20 mg/mL.
- Peak intradermal temperatures remained below 50°C.
- Increasing PD enhanced immediate tensile strength up to specific thresholds, but higher PD (>23.9 W/cm²) caused thermal injury.
Conclusions:
- PD is the primary factor influencing solder and tissue temperature in LTS.
- Reproducible LTS relies on controlling PD with diode laser and ICG-albumin solder.
- Optimal wound closure was achieved with 2.5 mg/mL ICG and PD between 15.9–23.9 W/cm².