Dissection and hemostatic division of the mesente-rium and omentum in the laparoscopic setting was excellently performed by the new dissecting forceps. The

Fig. 13.3 a The root of the porcine inferior mesenteric artery (IMA), measuring approximately 7 mm in outer diameter. The curved forceps facilitated fine dissection. b The porcine IMA was clamped by the forceps, and ideal heat for sealing was be-

curved grippers seemed significantly advantageous in dissecting around the target tissue. Although a small amount of smoke was detected when the device was activated and the target was treated, it did not obscure the endoscopic view as much as the mist produced by the USAD. We touched the living tissue such as the intestinal wall or liver with the tip of the device while it was activated. Because no cavitation phenomenon is associated with our device, we did not see such injury in the tissue, which the device tip contacted, as seen in the tissue destroyed by the USAD's cavitation. The only change we saw in the surface of the touched tissue was that the point was discolored whitish.

The root of the inferior mesenteric artery, measuring approximately 7 mm in diameter, was sealed and cut by the new device. It was well demonstrated that this large-sized artery could be securely sealed and divided in one session (Fig. 13.3a-d).

In the latter experiment, 12 portions of the medium-sized arteries (gastroepiploic arteries), measuring 3 to 4 mm in diameter, were sealed and cut by the proto-

ing given to the IMA. c The IMA could be sealed and divided. d Closeup of the cut edge of the porcine IMA. The stump was sufficiently sealed, tolerating the arterial pressure

Time and bursting pressure

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