Stapler powered auxiliary device for injecting material between stapler jaws

1. An auxiliary device for use in a surgical stapler comprising:

a nozzle assembly including:

a nozzle body defining a cavity and having a discharge port, the nozzle body being longitudinally tapered; and

a compression assembly movably mounted within the cavity of the nozzle body and having a compression roller, a drive block, a clevis arm having first and second ends and pivotally mounted to the drive block at the first end and a spindle mounted to the clevis arm at the second end, the first roller mounted on the spindle;

the compression assembly being movable between a proximal position wherein the compression roller is spaced from the discharge port to a distal position wherein the compression roller is substantially adjacent the discharge port; and

a drive mechanism operatively connected to said surgical stapler and engagable with the drive block, the drive mechanism configured to move the compression assembly between the proximal and distal positions, wherein the compression roller of the compression assembly urges material contained within the cavity toward the discharge port as the compression assembly moves between the proximal and distal positions.

2. The device as recited in claim 1 , further comprising a spring attached to the clevis arm, the spring biasing the compression roller into engagement with an inner surface of the nozzle body.

3. The device as recited in claim 1 , wherein the nozzle body includes upper and lower inner surfaces, the upper and lower inner surfaces being spaced further apart at their respective proximal ends and closer together at their respective distal ends such that the upper and lower inner surfaces taper towards the discharge port.

4. The device as recited in claim 3 , wherein the compression roller engages the upper inner surface as it moves between the proximal and distal positions.

5. The device as recited in claim 4 , wherein the nozzle assembly includes a drive nut fixed within the nozzle body and defining a threaded bore and the drive mechanism includes a drive screw rotatably mounted within the threaded bore, a distal end of the screw being engagable with the compression assemble to move the compression assembly within the nozzle body as the drive screw is rotated within the drive nut.

6. The device as recited in claim 5 , wherein the drive mechanism includes a motor engagable with the drive screw to rotate the drive screw within the drive nut.

7. The device as recited in claim 6 , wherein the drive screw is mounted on a distal end of a cable and a proximal end of the cable is affixed to the motor.

8. The device as recited in claim 1 , wherein the compression roller is formed of an incompressible material.

9. The device as recited in claim 1 , wherein the compression roller is formed of a compressible material.

10. An auxiliary device for use in a surgical stapler comprising:

a nozzle assembly including:

a nozzle body defining a cavity and having a discharge port, the nozzle body being longitudinally tapered; and

a compression assembly movably mounted within the cavity of the nozzle body and having a compression roller, the compression assembly being movable between a proximal position wherein the compression roller is spaced from the discharge port to a distal position wherein the compression roller is substantially adjacent the discharge port; and

a drive mechanism operatively connected to said surgical stapler and configured to move the compression assembly between the proximal and distal positions, wherein the compression roller of the compression assembly compresses material contained within a capsule positioned within the cavity of the nozzle body to break the capsule as the compression roller moves between the proximal and distal positions.

11. The device as recited in claim 10 , wherein the capsule has a wall thickness which is greater at the proximal end than at the distal end.