Trocar retainer assembly for surgical stapler

1. An end effector comprising:

an elongate shaft having a lumen;

an adapter disposed at a proximal end of the elongate shaft and configured to couple the elongate shaft with a handle assembly of a surgical instrument;

a support member having proximal and distal openings defining a passage therethrough, the support member disposed in the lumen of the elongate shaft;

a trocar assembly having a sleeve and a trocar member disposed therein, the trocar assembly insertable into the passage of the support member and the sleeve including an orifice extending through a wall thereof;

a pin disposed in the elongate shaft, the pin slidable in a direction transverse to a longitudinal axis of the elongate shaft, the pin insertable into the orifice of the sleeve for retaining the trocar assembly longitudinally stationary relative to the elongate shaft and defining an inserted position of the pin; and

a ramp located in a proximal region of the support member, the ramp engageable with a head of the pin to maintain the pin in the orifice of the sleeve.

2. The end effector according to claim 1 , wherein the support member is slidable relative to the elongate shaft between a proximal position and a distal position.

3. The end effector according to claim 1 , wherein the support member includes first and second portions that are attachable to each other.

4. The end effector according to claim 2 , wherein the distal position of the support member relative to the elongate shaft allows movement of the pin between the inserted position and a retracted position.

5. The end effector according to claim 2 , wherein the proximal position of the support member maintains the pin in the inserted position.

6. The end effector according to claim 1 , wherein the support member further includes first and second pads that are configured to support first and second drive members to limit radial movement of the first and second drive members during an actuation sequence.

7. The end effector according to claim 2 , further including a seal positioned at a distal end of the support member, the seal being threadably coupled to the elongate shaft to maintain the support member in the proximal position.

8. The end effector according to claim 2 , wherein the ramp includes a tapered leading edge adapted to cammingly engage the head of the pin.

9. The end effector according to claim 4 , wherein the trocar assembly is longitudinally repositionable relative to the elongate shaft with the pin in the retracted position.

10. An end effector for use with a surgical instrument, the end effector comprising:

an elongate shaft having a lumen;

an adapter disposed at a proximal end of the elongate shaft, the adapter configured for coupling the elongate shaft with a handle assembly of the surgical instrument;

a support member having proximal and distal openings defining a passage therethrough, the support member disposed in the lumen of the elongate shaft and slidable relative to the elongate shaft between a proximal position and a distal position;

a trocar assembly insertable into the passage of the support member, the trocar assembly having a trocar member extending from a sleeve, the sleeve including an orifice extending through a wall of the sleeve;

a pin disposed in the elongate shaft, the pin slidable in a direction transverse to a longitudinal axis of the elongate shaft, the pin insertable into the orifice of the sleeve for retaining the trocar assembly longitudinally stationary relative to the elongate shaft and defining an inserted position of the pin; and

a ramp having a tapered edge and located in a proximal region of the support member, the ramp engageable with a head of the pin to maintain the pin in the orifice of the sleeve.

11. The end effector according to claim 10 , wherein the support member includes first and second portions that are attachable to each other.

12. The end effector according to claim 10 , wherein the distal position of the support member relative to the elongate shaft allows movement of the pin between the inserted position and a retracted position.

13. The end effector according to claim 10 , wherein the proximal position of the support member maintains the pin in the inserted position.

14. The end effector according to claim 10 , wherein the support member further includes first and second pads that are configured to support first and second drive members to limit radial movement of the first and second drive members during an actuation sequence.

15. The end effector according to claim 10 , further including a seal positioned at a distal end of the support member, the seal being threadably coupled to the elongate shaft to maintain the support member in the proximal position.

16. The end effector according to claim 10 , wherein the tapered edge is adapted to cammingly engage the head of the pin.

17. A method of coupling a trocar assembly to an end effector comprising:

inserting a trocar assembly into a lumen of an elongate shaft, the elongate shaft having an adapter disposed at a proximal end thereof that is configured to couple the elongate shaft with a handle assembly of a surgical instrument;

sliding a support member disposed in the lumen of the elongate shaft proximally thereby moving from the support member from a distal position towards a proximal position; and

engaging a head of a pin disposed in the elongate shaft with a ramp located in a proximal region of the support member and urging the pin into engagement with an orifice of a sleeve of the trocar assembly thereby retaining the trocar assembly longitudinally stationary with respect to the elongate shaft.

18. The method according to claim 17 , wherein sliding the support member includes the support member having first and second portions that are attachable to each other.

19. The method according to claim 17 , wherein sliding the support member includes the support member having first and second pads that are configured to support first and second drive members to limit radial movement of the first and second drive members during an actuation sequence.

20. The method according to claim 17 , wherein engaging the head of the pin includes engaging the head of the pin with a tapered edge of the ramp.