Electrosurgical radio frequency energy transmission medium

摘要

An electrosurgical system includes a generator that generates electrosurgical energy for treating tissue. The generator includes one or more active output terminals which supply energy to tissue and are operatively connected to one or more supply lines. The generator also includes one or more return output terminals which return energy from the tissue and are operatively connected to at least one return line. The system also includes an electrosurgical instrument operatively connected to the one or more supply lines and one or more return electrodes operatively connected to the one or more return lines. The system further includes an electrosurgical cable including one or more supply lines and one or more return lines, which are wound in a double helix fashion such that the electrical field along the cable is mitigated along the length thereof.

主权项

1. An electrosurgical system comprising:
a generator adapted to generate energy for treating tissue, the generator including an active output terminal operatively connected to a supply line and a return output terminal operatively connected to a return line; an electrosurgical instrument operatively connected to the supply line; at least one return electrode operatively connected to the return line; and an electrosurgical cable including the supply line and the return line, at least a portion of the supply line and at least a portion of the return line being wound around a dielectric insulator in a double helix having a first helix and a second helix, wherein inductance of the electrosurgical cable is given by the equation
B×(10.16×10^−9)×Ln [(2×D)/d)]+[2×(A+C)], wherein capacitance of the electrosurgical cable is given by the equation
[(B×(0.7065×10^−12))/Ln [(2×D)/d]]×er, wherein A is the distance between a first end of a wound portion of the electrosurgical cable and the output terminals, B is the length of the wound portion of the electrosurgical cable, C is the distance between a second end of the wound portion of the electrosurgical cable and at least one connector, D is the distance between one apex of the first helix and a nearest apex of the second helix, d is the diameter of each of the supply and return lines, and er is the dielectric constant of the dielectric insulator, and wherein the distances A and C are dependent on the length B.