Patent ID: 9114228
Filing Date: 2015-08-25
Classification: A61B,A61M

Abstract:
1. A dilator for inserting a cannula into a surgical pathway extending between a bladder and an external abdomen, comprising: a body which is located outside of the abdomen, the body including a ring portion which defines a central opening about a central axis through which the cannula is inserted; a plurality of arm receivers connected to the ring portion on opposite sides of the central axis; a plurality of substantially straight and elongated arms for insertion into the surgical pathway, each arm connected to and extending distally from one arm receiver, each arm having a central passageway which extends substantially along the length of the arm, each arm defining a window into the central passageway facing outward from the central axis at a position adjacent to the distal end of the arm; a longitudinal tab member positioned within the central passageway of each arm, the longitudinal tab member extending from a distal end located at the distal end of the arm past the window to a proximal end located in the arm receiver; a wing member attached to the proximal end of the longitudinal tab member, the wing member movably positioned in a longitudinally extending slot formed in the arm receiver, the wing member movable in the slot in distal and proximal directions to move the portion of the longitudinal tab member which is proximal to the window in distal and proximal directions within the central passageway; a portion of the longitudinal tab member adjacent to the window including stress risers adjacent to deflection portions of the longitudinal tab member, the stress risers directing the deflection portions to protrude outwardly through the window upon longitudinal distal movement of the longitudinal tab member by the wing member and to withdraw the deflection portions into the window upon longitudinal proximal movement of the longitudinal tab member by the wing member; the central passageway of each arm extending substantially straight between the window and the proximal end of each arm; and the proximal and distal movement of the wing member in the slot occurring in substantially straight alignment with the portion of the longitudinal tab member extending in the center passageway of each arm.