Near infrared laser-tissue welding using nanoshells as an exogenous absorber.

Journal Article (Journal Article)

Background and objective

Gold nanoshells are a new class of nanoparticles that can be designed to strongly absorb light in the near infrared (NIR). These particles provide much larger absorption cross-sections and efficiency than can be achieved with currently used chemical chromophores without photobleaching. In these studies, we have investigated the use of gold nanoshells as exogenous NIR absorbers to facilitate NIR laser-tissue welding.

Study design/materials and methods

Gold nanoshells with peak extinction matching the NIR wavelength of the laser being used were manufactured and suspended in an albumin solder. Optimization work was performed on ex vivo muscle samples and then translated into testing in an in vivo rat skin wound-healing model. Mechanical testing of the muscle samples was immediately performed and compared to intact tissue mechanical properties. In the in vivo study, full thickness incisions in the dorsal skin of rats were welded, and samples of skin were excised at 0, 5, 10, 21, and 32 days for analysis of strength and wound healing response.


Mechanical testing of nanoshell-solder welds in muscle revealed successful fusion of tissues with tensile strengths of the weld site equal to the uncut tissue. No welding was accomplished with this light source when using solder formulations without nanoshells. Mechanical testing of the skin wounds showed sufficient strength for closure and strength increased over time. Histological examination showed good wound-healing response in the soldered skin.


The use of nanoshells as an exogenous absorber allows the usage of light sources that are minimally absorbed by tissue components, thereby, minimizing damage to surrounding tissue and allowing welding of thicker tissues.

Full Text

Duke Authors

Cited Authors

  • Gobin, AM; O'Neal, DP; Watkins, DM; Halas, NJ; Drezek, RA; West, JL

Published Date

  • August 2005

Published In

Volume / Issue

  • 37 / 2

Start / End Page

  • 123 - 129

PubMed ID

  • 16047329

Electronic International Standard Serial Number (EISSN)

  • 1096-9101

International Standard Serial Number (ISSN)

  • 0196-8092

Digital Object Identifier (DOI)

  • 10.1002/lsm.20206


  • eng