Reload assembly for a circular stapling device
AssigneeCovidien LP
InventorAnthony Sgroi, Jr.
Life of this patent
Estimating the term…
Abstract
A reload assembly includes a shell housing, a knife carrier, and a one-way collar. The knife carrier is movably positioned about an inner housing portion of the shell housing between retracted and advanced positions and supports a snap-ring. The one-way collar is movably supported about the inner housing portion of the shell housing from a retracted position to an advanced position in response to movement of the knife carrier from its retracted position to its advanced position. The snap-ring is movable with the knife carrier to a position proximally of the one-way collar when the one-way collar is in its advanced position to obstruct movement of the knife carrier back towards its advanced position.
Claims20
A reload assembly comprising:
- a shell housing including an inner housing portion and an outer housing portion, the inner housing portion having an outer surface defining an annular recess;
- a staple cartridge supported on a distal portion of the shell housing, the staple cartridge having a plurality of staple pockets, each of the staple pockets receiving a staple;
- a pusher supported within the annular recess, the pusher movable between a retracted position and an advanced position to eject the staples from the staple cartridge;
- a knife carrier including a body defining a longitudinal axis and supporting a knife, the body of the knife carrier defining a central bore, the inner housing portion of the shell housing being positioned within the central bore of the knife carrier such that the knife carrier is movable about the inner housing portion of the shell housing between advanced and retracted positions;
- a resilient snap-ring axially fixed within the central bore of the knife carrier;
- and
- a one-way collar movable within the annular recess of the inner housing portion of the shell housing from a retracted position to an advanced position in response to movement of the knife carrier from its advanced position to its retracted position, wherein the snap-ring is movable to a position proximally of the one-way collar when the one-way collar is in its advanced position to obstruct movement of the knife carrier back towards its advanced position.
A circular stapling device comprising;
- an elongate body having a proximal portion and a distal portion;
- and
- a reload assembly supported on the distal portion of the elongate body, the reload assembly including:
- a shell housing including an inner housing portion and an outer housing portion, the inner housing portion having an outer surface defining an annular recess;
- a staple cartridge supported on a distal portion of the shell housing, the staple cartridge having a plurality of staple pockets, each of the staple pockets receiving a staple;
- a pusher supported within the annular recess, the pusher movable between a retracted position and an advanced position to eject the staples from the staple cartridge;
- a knife carrier including a body defining a longitudinal axis and supporting a knife, the body of the knife carrier defining a central bore, the inner housing portion of the shell housing being positioned within the central bore of the knife carrier such that the knife carrier is movable about the inner housing portion of the shell housing between advanced and retracted positions;
- a resilient snap-ring axially fixed within the central bore of the knife carrier;
- and
- a one-way collar movable within the annular recess of the inner housing portion of the shell housing from a retracted position to an advanced position in response to movement of the knife carrier from its advanced position to its retracted position, wherein the snap-ring is movable to a position proximally of the one-way collar when the one-way collar is in its advanced position to obstruct movement of the knife carrier back to its advanced position.
Dependencies are inferred from the claim text.