Patent ID: 8834505
Filing Date: 2014-09-16
Classification: A61B,A61M

Abstract:
1. A trocar for insertion through a tissue perforation, comprising: an elongate balloon having a lumen, a proximal end and a closed gastight distal end; the balloon having a first low-profile condition and a second high-profile condition; a cannula having a proximal end, a distal end and a lumen; the cannula being positioned and contained inside the lumen of the balloon in the first low-profile condition such that the distal end of the balloon is distal to the distal end of the cannula and the proximal end of the balloon is proximal to the proximal end of the cannula; the balloon having a reduced distal portion located distal to the distal end of a cannula in the first low-profile condition such that the reduced distal portion has a diameter smaller than the diameter of the cannula; the reduced distal portion of the balloon being adapted for insertion into a tissue perforation before insertion of the cannula into the tissue perforation; the second high-profile condition having a larger diameter relative to the first low-profile condition; the second high-profile large diameter condition is achieved by application of inflation pressure into the lumen of the balloon at the proximal end of the balloon; wherein the reduced distal portion is expanded in the second high-profile condition to facilitate movement of the cannula relative to the balloon into a position in the tissue perforation while inside the balloon lumen.