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Microvascular anastomosis using a photochemical tissue bonding technique
Anne C O'Neill1, Jonathan M Winograd, José L Zeballos
1Plastic Surgery Research Laboratory, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts 02114, USA.
Lasers in Surgery and Medicine
|October 27, 2007
Summary
Photochemical tissue bonding (PTB) offers a robust, fluid-tight seal for blood vessel repair, demonstrating superior mechanical strength and equal long-term patency compared to traditional sutures. This innovative technique shows promise for improved microsurgical outcomes.
Area of Science:
- Biomedical Engineering
- Microsurgery
- Vascular Surgery
Background:
- Photochemical tissue bonding (PTB) utilizes photoactive dyes and visible light to create tissue seals.
- PTB aims to achieve fluid-tight bonds without thermal damage, offering an alternative to conventional methods.
Purpose of the Study:
- To evaluate the efficacy of PTB in blood vessel repair compared to standard microsurgical sutures.
- To assess the mechanical strength, integrity, and patency of PTB repairs in ex vivo and in vivo models.
Main Methods:
- Ex vivo mechanical testing of porcine brachial arteries using hydrostatic leak point pressure (LPP).
- In vivo femoral artery repair in rats using either PTB or standard sutures.
- Evaluation of vessel patency at 6 hours and 8 weeks post-repair.
Main Results:
- PTB repairs exhibited significantly higher LPPs (1,100 mmHg) than suture repairs (350 mmHg) ex vivo.
- In vivo, both PTB and suture groups showed 100% patency at 6 hours and 80% at 8 weeks.
- PTB repairs demonstrated no bleeding at the site, unlike suture repairs.
Conclusions:
- PTB is a viable microvascular repair method.
- PTB creates an immediate, mechanically strong bond.
- PTB achieves short- and long-term patency rates comparable to standard suture repair.
