Dynamic obturator system

An insertion system for use in a surgical procedure, the insertion system 11 comprising:

• an obturator assembly comprising:
• an inner obturator member comprising:
• a body portion extending from a proximal end to a distal end along an inner obturator axis, an end portion of the body portion at the distal end 22 is chamfered, radiused, or gradually reduced in diameter so as to reduce trauma when introduced into a patient, the body portion comprising:
• a center portion extending from the proximal end to the distal end along the inner obturator axis;
• four elongated fin members that each extends along a corresponding portion of an external surface of the body portion;
• and
• a center aperture extending through the center portion from the proximal end to the distal end of the body portion along the inner obturator axis;
• an expandable obturator member extending from a proximal end to a distal end along an expandable obturator axis, the explainable obturator member comprising:
• a base portion that defines a base aperture;
• four elongated arm members that each extends from a proximal end to a distal end along an axis, the proximal end being coupled to a distal end of the base portion, each of the arm members comprising:
• a stem portion that extends from a proximal end to distal end, the proximal end disposed at the proximal end of the arm member,
• a tip portion that extends from a proximal end to distal end, with the proximal end at the distal end of the stem portion and the distal end at the distal end of the arm member, the tip portions having an outer surface that forms a portion of a frusto-conical shape with a diameter that increases from the distal end to the proximal end of each tip portion, and wherein a lip is formed at the proximal end of tip portion,
• wherein the inner obturator member is slidably disposed within the explainable obturator member such that each of the four elongated fin members are disposed within corresponding slots between adjacent arm members of the expandable obturator member, the inner obturator member being slidably disposed relative to the expandable obturator member from a first position of the obturator assembly, in which the axis of each of the arm members is parallel to the expandable obturator axis, to a second position of the obturator assembly, in which the distal end of each of the arm members is outwardly displaced relative to the first position;
• and
• a cannula member extending from a proximal end to a distal end along a cannula axis, the cannula member including a body portion that extends from a proximal end to a distal end, the body portion defining at least a portion of a cannula aperture, and the distal end may of the body portion at the distal end of the cannula member,
• wherein when a portion of the obturator assembly is disposed within the cannula aperture such that the distal end of the body portion of the cannula member is at or adjacent to the proximal end of each of the tip members of the arm members of the expandable obturator member such that when the obturator assembly is displaced from the first position to the second position, a proximal end of the frusto-conical shape formed by the outer surfaces of the tip members is disposed outward of a distal end of an outer surface of the body portion of the cannula member so as to reduce trauma to tissue of a patient when the insertion system is inserted into a body cavity of the patient.