Inflation and sealing device with rotary cutter

An inflatable-cushion inflation and sealing device including an inflation assembly (50) configured for inflating with a fluid a cushion cavity disposed between first and second layers (20,22) of film (10). The inflation assembly includes a fluid conduit (52) configured for longitudinal reception between first and second overlapping portions of an inflation channel (24) adjacent to and in fluid communication with the cushion cavity. The device further includes a cutting element (59) disposed proximate the fluid conduit and configured and oriented to cut open inflation channel by a cutting motion that includes rotation thereof. Also, the device includes a sealing assembly (70) configured to seal the overlapping portions to each other and to form a longitudinal seal configured to seal the fluid in the cushion cavity.