Patent ID: 8136712

Claim:
A surgical stapler, comprising: a body comprising: a handle portion; and a shaft portion extending from the handle portion; a stapling head assembly releasably coupled to the shaft portion, the stapling head assembly comprising: a staple cartridge for supporting one or more surgical staples; and at least one staple driver for engaging and driving the staples from the staple cartridge; a drive system for applying drive motions to the staple driver; an anvil movably supported relative to the staple cartridge for axial movement toward and away from the staple cartridge; and an anvil adjustment assembly for selectively adjusting an axial position of the anvil relative to the staple cartridge, wherein the anvil adjustment assembly comprises an adjustment shaft and a trocar coupled to the adjustment shaft for travel therewith, the trocar configured for removable attachment to the anvil, wherein one of the adjustment shaft or the body comprises an engagement portion, and wherein the other of the adjustment shaft or the body comprises: a screw surface comprising at least one ramp portion, at least one dwell portion, and at least one delimiter separating the at least one dwell portion from the at least one ramp portion, the at least one ramp portion wherein the at least one delimiter comprises at least one of a bump, a protrusion, or a notch configured to operably engage the engagement portion to cause the adjustment shaft to move relative to the body when the adjustment shaft is rotated.