Evaluation of the hemostatic and coagulation effects of AUTO CUT and DRY CUT using a computer-controlled cutting system.
OBJECTIVE
To evaluate a newly developed computer-controlled cutting system for the generation of standardized resections and to systematically compare the hemostatic properties and tissue effect of 2 cutting modes, namely, AUTO CUT and DRY CUT used in urologic procedures.


METHODS
An isolated perfused kidney model was used to assess blood loss and coagulation depth after resection of tissue specimens of standardized geometry, size, and cutting velocity with a resection loop. Three different effect settings (E1, E3, and E6; 200 W) of the electrosurgical modes AUTO CUT and DRY CUT were compared. Blood loss was determined semiquantitatively by weighing a swab before and after placing it onto the resection area. The coagulation depth was estimated microscopically on cross sections.


RESULTS
The computer-controlled cutting system creates resections of standardized geometry and size with a high reproducibility. An effect level-dependent increase in hemostasis and coagulation depth could be demonstrated with the cutting modes DRY CUT and AUTO CUT using this computer-controlled cutting system. The hemostatic effect with DRY CUT is significantly more pronounced than with AUTO CUT (E1, E3: P < .0001, E6: P = .004), and the coagulation is significantly deeper (E1, E3, E6: P < .0001).


CONCLUSIONS
The computer-controlled cutting system creating reproducible resections in combination with the isolated perfused kidney model offers the possibility to systematically investigate bleeding rate and coagulation depth. The stronger hemostatic properties of the DRY CUT mode are more favorable for urologic interventions requiring a higher hemostatic effect than the AUTO CUT mode.
Szyrach
Mara N I
MN
ERBE Elektromedizin GmbH, Tuebingen, Germany. mszyrach@erbe-med.de
Tolba
Rene H
RH
Voigtländer
Matthias
M
Neugebauer
Alexander
A
Enderle
Markus D
MD
D001777:Blood Coagulation; D004598:Electrosurgery / Q000379:methods*; D006489:Hemostatic Techniques; D006801:Humans; D066298:In Vitro Techniques; D007668:Kidney / Q000601:surgery*; D025321:Surgery, Computer-Assisted