Laser assisted vascular welding with real time temperature control

✍ Scribed by Stewart, Robert B.; Benbrahim, Aziz; LaMuraglia, Glenn M.; Rosenberg, Meir; L'Italien, Gilbert J.; Abbott, William M.; Kung, Robert T.V.

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 809 KB
• Volume: 19
• Category: Article
• ISSN: 0196-8092
• DOI: 10.1002/(sici)1096-9101(1996)19:1<9::aid-lsm2>3.0.co;2-w

✦ Synopsis

Background and objective:

Previous studies in laser assisted vascular welding have been limited by the lack of a reliable end point for tissue fusion. as a means of improving the reproductibility of laser assisted repairs, a system incorporating real time temperature monitoring and closed loop feedback was used.

Study design/materials and methods:

The system consisted of a direct view infrared thermometer for monitoring the laser heated spot, a 1.9 microns diode laser, and a microprocessor for data acquisition and feedback control of the laser power to maintain a constant tissue temperature. rat aortas were welded under constant surface temperature conditions.

Results:

In vivo temperature stability of +/- 2 degrees c was achieved over a temperature range of 70-90 degrees c pertinent to welding small vessels. when welds were completed using the feedback system to maintain the tissue temperature at 80 degrees c, the acute success rate was 100% and the burst pressure was 290 +/- 70 mmhg.

Conclusion:

These studies demonstrate that the use of real time monitoring and feedback control results in improved consistency for vascular tissue welding.