Patent ID: 6224608
Filing Date: 2001-05-01
Classification: A61B

Abstract:
A trocar positioning device comprising:(i) first housing means configured and dimensioned to slidably engage a trocar guide tube, said first housing means having guide tube gripping means for selectively gripping the guide tube; and(ii) second housing means configured and dimensioned to engage said first housing means to cause said gripping means to grip the guide tube and prevent movement of said trocar positioning device relative to the guide tube, said second housing means having tissue engaging thread means for engaging body tissue and securing the position of the trocar positioning device relative thereto, said thread means having a base, a distal surface extending from said second housing to a thread apex, and a proximal thread wall extending from the second housing to said thread apex;wherein a distal read surface flank angle is defined by the angle between a vertical line perpendicular to said base extending through said thread apex and a line extending from said distal thread based surface to said thread apex, and a proximal end wall flank angle is defined by the angle between a vertical line perpendicular to said base extending through said thread apex and said proximal end wall;wherein said flank angle of said distal thread surface is greater than said flank angle of said proximal end wall, at a ratio of about 6 to about 1 respectively:wherein said distal thread surface has a radius of curvature of about 0.07 to about 0.09 inches.