Diameter and Pressure of the Water-Jet For Liver Resection

Abstract

Objective: The aim of this study was to evaluate the
effect of various nozzle diameter and different liquid
delivery pressure on efficacy of water-jet in experimen-tal liver resection.
Method: Depending on the used nozzle diameter, the
animals were divided into two groups. In the first group
of animals, the nozzle diameter was 0.1 mm and this
group was divided into 3 subgroups depending on the
liquid pressure applied:  8 ATM, 12 ATM and 16 ATM,
with 5 water-jet liver dissection is in each subgroup.
Water-jet dissection with  nozzle diameter of 0.2 mm
was used in the second  group of animals, which was
divided into three subgroups with 5 water-jet liver dis-section in each, depending on liquid pressure: 4 ATM,
8 ATM and 12  ATM. The criteria such as blood loss,
operation time, parenchymal necrosis, expired liquid
volume, and postoperative complications were used
for comparison.
Results: Water-jet with a diameter of 0.1mm   and pres-sure of 12 ATM showed faster cutting with reasonable
blood loss  when compared to the low pressure sub-group (8 ATM) and result in lesser parenchymal necro-sis, smaller expired liquid volume and  acceptable
speed of resection when compared to the high pres-sure  subgroup (16 ATM). Increase of the pressure from
4 to 12 ATM of water-jet with diameter of 0.2 mm  re-sulted in increase of blood loss and  necrosis, but did
not effect the speed  of resection significantly. Despite
lesser blood loss and smaller necrosis, the water-jet
at 4 ATM had slower speed of resection. Water-jet with
diameter of 0.2 mm and pressure of 8 ATM cut  liver
more faster without significantly effecting blood loss
and necrosis in comparison to that at a pressure  of 4
ATM.
Conclusion:  Our study showed that, increasing the
nozzle diameter and liquid delivery pressure resulted
in an increase of blood loss and tissue necrosis. Wa-ter-jets with diameter of 0.1 mm and pressure of 12
ATM   is more acceptable for resection of normal liv-ers.
Key words: Liver resection, water-jet

Keywords

• -