There is disclosed an auxiliary device for injecting material between the jaws of a surgical stapler. The auxiliary device includes a nozzle assembly having a discharge port and a compression assembly having at least one compression roller for forcing material out of the discharge port. The disclosed compression rollers may be formed of an incompressible or compressible material. The auxiliary device also includes a drive mechanism for moving the compression assembly within a nozzle body of the nozzle assembly. There is also disclosed a rupturable capsule for retaining material to be dispensed.
