Abstract: A trocar for performing a procedure on a patient. The trocar includes a hollow cannula having a distal end and a proximal end. The trocar includes a housing having a distal end attached to the proximal end of the cannula and a proximal end having a wall attached thereto. The wall having an aperture therethrough. The trocar further includes a first seal disposed within the housing comprising a plurality of layered elastomeric members forming conical shape.

Abstract: One medical-treatment electrode assembly includes a medical-treatment flexible electrode supported on the outer surface of a sidewall of a flexible tube which is insertable into a patient. Another assembly includes two electrodes supported on the outer surface of a flexible tube, wherein a video camera of a flexible endoscope inserted into the tube can view patient tissue between the two electrodes. An additional assembly includes apparatus for moving patient tissue into a sidewall opening of a tube which supports a medical-treatment electrode to tighten patient tissue outside the tube against the medical-treatment electrode. A method for medical treatment includes moving patient tissue into a sidewall opening of a tube which supports a medical-treatment electrode to tighten patient tissue outside the tube into substantially full contact with the medical-treatment electrode.

Abstract: A seal assembly for use in conjunction with a trocar assembly includes a seal body adapted for movement for selectively opening and substantially completely closing the seal assembly. The seal assembly includes a longitudinal axis extending therethrough with a transverse plane substantially perpendicular thereto. The seal body includes a proximal end and a distal end, the proximal end making a first angle with respect to the transverse plane and the distal end making a second angle with respect to the transverse plane, wherein the first angle is less than the second angle.