Patent ID: 7153319

Claim:
A trocar system comprising: a cannula having an elongate cannula body, the cannula body including medial and distal portions thereof having a first diameter and a proximal portion thereof connected to the medial portion and having a second diameter, the second diameter being larger than the first diameter; and a trocar having an elongate trocar body for extending through the cannula, the elongate trocar body having a sharpened distal end portion, a medial portion thereof including a first section having a first diameter and a second section having a second diameter smaller than the first diameter, a proximal portion having a third diameter, the third diameter being larger than the first diameter, a handle connected to a proximal end portion of the trocar body for gripping of and handling of the trocar by a hand of a user, and a shield slidably mounted to the medial portion of the trocar body and having a tubular-shaped shield body that substantially surrounds the second section of the medial portion of the trocar body and having a fourth diameter being equal to or less than the third diameter and biased by biasing means in an extended position so that a distal end of the shield coveringly protects the sharpened distal end of the trocar body until pressure is applied thereagainst so that the shield slidably moves toward the proximal portion of the trocar body in a retracted position, and a shoulder extending radially inwardly from a second portion of the inner surface of the shield body to define a shield stop positioned to provide a stop for the shield body when in an extended position, the biasing means positioned substantially between an outer surface of the second section of the medial portion of the trocar body and a first portion of an inner surface of the tubular-shaped shield body and extending between and in contact with a distal portion of the first section of the medial portion of the trocar body and a proximal portion of the shield stop.