TY - JOUR
AU - Fried, Nathaniel M.
AB - Energy-based, radiofrequency and ultrasonic devices provide rapid sealing of blood vessels during laparoscopicprocedures. We are exploring infrared lasers as an alternative for vessel sealing with less collateral thermal damage.Previous studies demonstrated vessel sealing in an in vivo porcine model using a 1470-nm laser. However, theinitial prototype was designed for open surgery and featured tissue clasping and light delivery mechanismsincompatible with laparoscopic surgery. In this study, a laparoscopic prototype similar to devices in surgical usewas developed, and tests were conducted on porcine renal blood vessels. The 5-mm-OD prototype featured atraditional Maryland jaw configuration. Laser energy was delivered through a 550-m-core fiber and side-deliveryfrom the lower jaw, with beam dimensions of 18-mm-length x 1.2-mm-width. The 1470-nm diode laser delivered68 W with 3 s activation time. A total of 69 porcine renal vessels with mean diameter of 3.3  1.7 mm were tested,ex vivo. Vessels smaller than 5 mm were consistently sealed (48/51) with burst pressures greater than malignanthypertension blood pressure (180 mmHg), averaging 1038  474 mmHg. Vessels larger than 5 mm were notconsistently sealed (6/18), yielding burst pressures of only 174  221 mmHg. Seal width, thermal damage zone, andthermal spread averaged 1.7  0.8, 3.4  0.7, and 1.0  0.4 mm. A novel optical laparoscopic prototype with 5-mm-OD shaft integrated within a standard Maryland jaw design consistently sealed vessels less than 5 mm with minimalthermal spread. Further in vivo studies are planned to test performance across a variety of vessels and tissues.
TI - Laparoscopic prototype for optical sealing of renal blood vessels
JF - Proceedings of SPIE
DO - 10.1117/12.2256048
DA - 2017-02-06
UR - https://www.deepdyve.com/lp/spie/laparoscopic-prototype-for-optical-sealing-of-renal-blood-vessels-3bJYAfG0EC
SP - 100380V
EP - 100380V-7
VL - 10038
IS - 
DP - DeepDyve
ER -