Abstract: A seal for use with a trocar. The seal includes a first portion terminating in a proximal end, a second portion terminating in a distal end, and a connecting region disposed between the first and the second portion. At least one longitudinal slit extends from the connecting region toward one of the proximal end, toward the distal end, or toward both. When the seal is in an unstressed state, the seal provides a fluid barrier and when the seal is in a stressed state, the at least one longitudinal slit opens to provide access to the inner portion of the seal.

Abstract: A trocar having a cutting shaft with a cutting surface at a distal end. The cutting shaft moves longitudinally with respect to an obturator such that in one position the cutting surface is in an exposed position suitable for application of a piercing force. Upon interruption of the piercing force to the cutting surface, the cutting surface moves longitudinally with respect to the obturator such that the cutting surface is in a retracted position within the obturator. The trocar may include a first spring urging the cutting surface to an exposed position and a second spring urging the cutting surface to a retracted position. The second spring has a slightly stronger biasing force than the first spring to bias the cutting surface to the retracted position.