Liver resection is the standard treatment for any liver lesion. Laparoscopic liver
resection is associated with lower intra-operative blood loss and fewer complications
than open resection. Access to the posterior part of the right liver lobe is very
uncomfortable and difficult for surgeons due the anatomic position, especially when
employing laparoscopic surgery. Based on these experiences, a new laparoscopic device
was developed that is capable of bending its long axis and allowing the application
of radiofrequency energy in areas that were not technically accessible. The device is
equipped with four telescopic needle electrodes that cause tissue coagulation after
the delivery of radiofrequency energy. Ex vivo testing was performed
in 2012 and 2014 at the University Hospital, Ostrava, on a porcine liver tissue. The
main goal of this testing was to verify if the newly proposed electrode layout was
suitable for sufficient tissue coagulation and creating a safety zone around lesions.
During the ex vivo testing, the material of needle electrodes was
improved to achieve the lowest possibility of adhesion. The power supply was adjusted
from 20 to 120 W and the ablation time, which varied from 10 to 110 s, was monitored.
Subsequently, optimal power delivery and time for coagulation was determined. This
experimental study demonstrated the feasibility and safety of the newly developed
device. Based on the ex vivo testing, LARA-K1 can create a safety
zone of coagulation. For further assessment of the new device, an in
vivo study should be performed.
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