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Proceedings Paper

ICG-doped albumin protein solders for improved tissue repair
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Paper Abstract

An in vitro study was performed using an 808nm-diode laser in conjunction with indocyanine green-doped albumin protein solders to repair bovine aorta specimens. Investigations were conducted to determine optimal solder and laser parameters for tissue repair in terms of tensile strength, temperature rise and damage and the microscopic nature of the bonds formed. Liquid and solid protein solders prepared from 25% and 60% bovine serum albumin (BSA), respectively, were compared. The tensile strengths of the repairs were greatly improved with an increase in BSA concentration from 25% to 60% and a reduction in ICG dye concentration from 2.5 mg/ml to 0.25 mg/ml. Increasing the later irradiance and thus surface temperature resulted in an increased severity of histological injury. Thermal denaturation of the tissue substrate increased laterally and in depth with higher temperatures. Optimal repairs in terms of bond strength and thermal damage were achieved by denaturing a solid protein solder composed of 60% BSA and .025mg/ml ICG with an irradiance of 6.4 W/cm2. Using this combination of solder and laser parameters, surface temperatures were observed to reach 85±5°C with an average temperature difference across the solder strips of 15°C across a thickness of 150 μm. Histological examination of the repairs formed using these parameters showed negligible evidence of collateral thermal damage to the underlying tissue. Scanning electron microscopy suggested albumin intertwining within the itssue collagen matrix and subsequent fusion with the collagen as the mechanism for laser tissue soldering.

Paper Details

Date Published: 22 June 1999
PDF: 12 pages
Proc. SPIE 3590, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems IX, (22 June 1999); doi: 10.1117/12.350951
Show Author Affiliations
Karen M. McNally-Heintzelman, Univ. of Texas/Austin and Macquarie Univ. (United States)
Brian S. Sorg, Univ. of Texas/Austin (United States)
Ashley J. Welch, Univ. of Texas/Austin (United States)
Judith M. Dawes, Macquarie Univ. (Australia)


Published in SPIE Proceedings Vol. 3590:
Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems IX
Kenton W. Gregory; R. Rox Anderson; David S. Robinson; Reza S. Malek; Lou Reinisch; Darryl J. Bornhop; Kenneth Eugene Bartels; Hans-Dieter Reidenbach; Lloyd P. Tate; C. Gaelyn Garrett; Eugene A. Trowers; Aaron P. Perlmutter; Kenneth Eugene Bartels; Lawrence S. Bass; Darryl J. Bornhop; C. Gaelyn Garrett; Kenton W. Gregory; Nikiforos Kollias; Harvey Lui; Reza S. Malek; Aaron P. Perlmutter; Hans-Dieter Reidenbach; Lou Reinisch; David S. Robinson; Lloyd P. Tate; Eugene A. Trowers, Editor(s)

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