Tissue stop for surgical instrument

1. A surgical instrument for surgically joining tissue, the surgical instrument comprising:

a handle assembly;

an elongated portion extending distally from the handle assembly and defining a longitudinal axis;

an end effector disposed adjacent a distal portion of the elongated portion, the end effector including a first jaw member and a second jaw member, at least one jaw member being movable with respect to the other jaw member between spaced and approximated positions;

a stop member disposed adjacent a distal portion of the first jaw member, the stop member being pivotable about a pivot with respect to the first jaw member between a first position, a significant portion of the stop member being positioned external to the first jaw member, and a second position capturing the tissue between the first jaw member and second jaw member, the relative movement of the jaw members toward the approximated position causing at least a portion of the stop member to move toward the first jaw member.

2. The surgical instrument of claim 1 , wherein the jaw members are curved with respect to the longitudinal axis.

3. The surgical instrument of claim 1 , further comprising a biasing member disposed in mechanical cooperation with the stop member, wherein the biasing member biases stop member towards its first position.

4. The surgical instrument of claim 1 , wherein the stop member includes a base and a stopping portion, the base being operatively connected to the stopping portion.

5. The surgical instrument of claim 4 , wherein the stopping portion is pivotally connected to the base.

6. The surgical instrument of claim 4 , wherein the pivot is disposed distally of the stopping portion.

7. The surgical instrument of claim 1 , wherein the stop member is pivotally coupled to the first jaw member.

8. The surgical instrument of claim 1 , wherein the first jaw member includes a knife channel.

9. A tool assembly for use with a surgical instrument, the tool assembly comprising:

an end effector including a first jaw member and a second jaw member, at least one jaw member being movable with respect to the other jaw member between spaced and approximated positions;

a stop member disposed adjacent a distal portion of the first jaw member, the stop member being pivotable about a pivot with respect to the first jaw member between a first position wherein at least a portion of the stop member is positioned external to the first jaw member, and a second position capturing the tissue between the first jaw member and second jaw member, wherein the relative movement of the jaw members toward the approximated position causes at least a portion of the stop member to move toward the first jaw member.

10. The tool assembly of claim 9 , wherein the end effector includes a longitudinally curvilinear shape.

11. The tool assembly of claim 9 , wherein the stop member is biased toward the first position.

12. The tool assembly of claim 9 , wherein the first jaw member includes at least one slot formed therein, the at least one slot being configured to receive at least a portion of the stop member.

13. The tool assembly of claim 9 , wherein the pivot is disposed distally of a stopping portion of the stop member.

14. A method of fastening tissue with surgical fasteners, comprising:

disposing the tissue between a first jaw member and a second jaw member;

pivoting the first jaw member about a pivot with respect to the second jaw member to engage the tissue; and

pivoting a stop member disposed between the first jaw member and the second jaw member to maintain the tissue between the first jaw member and second jaw member, the stop member being disposed at distal ends of the jaws, the relative movement of the jaw members toward the approximated position causing at least a portion of the stop member to move toward the first jaw member.

15. The method of claim 14 , wherein the pivot is disposed distally of a stopping portion of the stop member.