Trocar obturator with cutting edges
A trocar obturator includes a shaft having a proximal end and a distal end. The trocar obturator also includes a tip positioned at the distal end of the shaft, the tip including a distally extending blade structure adapted to reduce penetration forces required during insertion of the trocar obturator. The blade structure includes a first cutting edge and a second cutting edge.
1 . A trocar obturator, comprising:
a shaft having a proximal end and a distal end;
a tip positioned at the distal end of the shaft, the tip including a distally extending blade structure adapted to reduce penetration forces required during insertion of the trocar obturator;
the blade structure includes a first cutting edge and a second cutting edge with as secondary flat cut angle extending between the first cutting edge and the second cutting edge as well as a central axis of the trocar, wherein the first cutting edge and the second cutting edge are offset;
the tip including a cone which extends from the distal end of the shaft to the first cutting edge and the second cutting edge.
2 . The trocar obturator according to claim 1 , wherein the first and second cutting edges are substantially parallel.
3 . The trocar obturator according to claim 1 , wherein the first and second cutting edges respectively include a negative cutting angle.
4 . The trocar obturator according to claim 3 , wherein the first and second cutting edges range from −60° to 0°.
5 . The trocar obturator according to claim 4 , wherein the first and second cutting edges range from −45° to −30°.
6 . The trocar obturator according to claim 1 , wherein the first and second cutting edges respectively include a positive cutting angle.
7 . The trocar obturator according to claim 6 , wherein the first and second cutting edges range from 0° to 70°.
8 . The trocar obturator according to claim 7 , wherein the first and second cutting edges range from 0° to 60°.
9 . The trocar obturator according to claim 1 , wherein the cone of the tip has a cone angle of approximately 30° to approximately 150°.
10 . A trocar assembly, comprising:
a trocar sleeve and a trocar obturator shaped and dimensioned for movement within the trocar sleeve;
the trocar obturator includes a shaft having a proximal end and a distal end, a tip positioned at the distal end of the shaft, the tip including a distally extending blade structure adapted to reduce penetration forces required during insertion of the trocar obturator, and the blade structure includes a first cutting edge and a second cutting edge with a secondary flat cut angle extending between the first cutting edge and the second cutting edge as well as a central axis of the trocar, wherein the first cutting edge and the second cutting edge are offset;
the tip including a cone which extends from the distal end of the shaft to the first cutting edge and the second cutting edge.
11 . The trocar assembly according to claim 10 , wherein the first and second cutting edges are substantially parallel.
12 . The trocar assembly according to claim 10 , wherein the first and second cutting edges respectively include a negative cutting angle
13 . The trocar assembly according to claim 12 , wherein the first and second cutting edges range from −60° to 0°.
14 . The trocar assembly according to claim 10 , wherein the first and second cutting edges respectively include a positive cutting angle.
15 . The trocar assembly according to claim 14 , wherein the first and second cutting edges range from 0° to 70°.
16 . The trocar assembly according to claim 10 , wherein the cone of the tip has a cone angle of approximately 30° to approximately 150°.