Fig. 13.4 Distribution of burst pressures in 12 artery segments and time required to seal and cut each artery type forceps. All portions were sufficiently sealed and cut without hemorrhage.

Time required sealing and cutting the artery ranged from 8.2 to 12 s, with an average of 8.9 s (Fig. 13.4).

In the manometry experiments two stumps were not burst by the maximum pressure of the manometer system (1,839 mmHg). The other 10 stumps showed burst pressures ranging from 897 to 1,618 mmHg (Fig. 13.4).

Fig. 13.5 Microscopic picture of the porcine artery sealed and divided by the prototype forceps (high-power view, hematoxylin and eosin staining). The artery was well welded, closed, and cut without carbonization, vacuolization, or severe desiccation

Microscopic examination revealed that the artery stump was sufficiently denatured, welded, and closed (Fig. 13.5). The tissue denature was not associated with such extreme changes such as carbonization, vacuolization, or severe desiccation, often characteristically observed in monopolar high-frequency technique.

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