Patent ID: 8398666

Claim:
An instrument comprising: a trocar sleeve having an open distal end; an obturator being movably disposed within said trocar sleeve and including a penetrating tip disposed at one end thereof, said obturator including a central longitudinal axis, said penetrating tip comprising a blunted apex, a base and an exterior surface extending longitudinally between said base and said apex; and a cross section of said penetrating tip taken along said central longitudinal axis substantially transversely thereof between said apex and said base having a dimension of said cross-section in at least one direction which is greater than another dimension of said cross section in another direction substantially perpendicular to said one direction, further comprising at least two curved surface segments formed on said exterior surface and extending longitudinally between said apex and said base, wherein said penetrating tip comprises at least two curved segregating edges extending longitudinally along said exterior surface between said apex and said base, said curved segregating edges each having a blunted edge configuration disposed between and connecting said two curved surface segments, said blunted edge configuration extending at least from said apex towards said base.