Patent ID: 8043207

Claim:
An operative head of a device for endolumenally treating a full-thickness portion of a wall of an organ, comprising: a housing having an endoscope channel extending therethrough for slidably receiving an endoscope therein, cross-sectional shape of the endoscope channel being substantially elliptical, the housing including a stapling mechanism having a plurality of staple firing chambers disposed around a portion of a periphery of the housing; and an anvil member longitudinally moveable relative to the stapling mechanism between a tissue receiving position and a tissue stapling position, the anvil member being further moveable relative to the housing between a staple forming configuration in which staple forming grooves thereof are aligned with corresponding ones of the staple firing chambers and a high visibility configuration providing a field of vision of an endoscope received in the endoscope channel greater than that provided when the anvil member is in the staple forming configuration, wherein the staple forming grooves are disposed along a substantially elliptical path.