Loading unit locking band for surgical stapling instrument

A loading unit comprising:

• a shell assembly having a proximally extending annular body, the annular body defining two hook openings that oppose one another, a lug opening positioned between the hook openings, and a central passage for receiving a portion of a surgical instrument;
• and
• a locking band having an arced body with two ends, a retention hook positioned adjacent each end of the body and extending from an inner surface of the body, and a lug positioned between the retention hooks and extending from the inner surface of the body, each retention hook disposed within a respective one of the hook openings to retain a respective one of the ends of the locking band to the annular body, the lug disposable through the lug opening into the central passage to secure the loading unit to the surgical instrument;
• wherein each of the retention hooks has a disengaged configuration, and wherein when both of the retention hooks are in the disengaged configuration the lug extends through the lug opening into the central passage.

A loading unit comprising:

• an annular staple cartridge;
• a shell assembly having a proximally extending annular body, the annular body defining two hook openings that oppose one another, a lug opening positioned between the hook openings, and a central passage for receiving a portion of a surgical instrument;
• and
• a locking band having an arced body with two ends, a retention hook positioned adjacent each end of the body and extending from an inner surface of the body, and a lug positioned between the retention hooks and extending from the inner surface of the body, each retention hook disposed-within a respective one of the hook openings to retain a respective one of the ends of the locking band to the annular body, the lug disposable through the lug opening into the central passage to secure the shell assembly to the surgical instrument;
• wherein the annular body includes flats adjacent each hook opening, the flats defining planes that are parallel to one another.

A loading unit comprising:

• a shell assembly having a proximally extending annular body, the annular body defining two detent wells defined in an outer surface of the annular body spaced from one another, a lug opening extending through the annular body, and a central passage for receiving a distal end portion of a surgical instrument;
• and
• a locking band having an arced body with two ends, each end having a detent extending from an inner surface of the body, the body including an inwardly extending lug positioned between the ends, the locking band having a locked configuration in which each detent is received within a respective detent well and the lug extends through the lug opening and into the central passage, an unlocked configuration in which each detent is received within a respective detent well and the lug is positioned outside of the central passage, and a released configuration in which at least one detent is positioned about the annular body between a respective detent well and the lug opening and the lug is positioned outside of the central passage;
• wherein the annular body defines two flats that are parallel to one another on opposite sides of the annular body, a respective one of the detent wells being defined in each of the flats.

A surgical system comprising:

• a surgical instrument having a distal end portion, the distal end portion defining a lug window;
• a loading unit including an annular staple cartridge and a shell assembly supporting the annular staple cartridge, the shell assembly having a proximally extending annular body, the annular body defining two hook openings that oppose one another, a lug opening positioned between the hook openings, and a central passage that receives the distal end portion of the surgical instrument;
• and
• a locking band having an arced body with two ends, a retention hook positioned adjacent each end of the body and extending from an inner surface of the body, and a lug positioned between the retention hooks and extending from the inner surface of the body, each retention hook extending through a respective one of the hook openings to retain a respective one of the ends of the locking band to the annular body, in a locked configuration of the body the lug is disposed through the lug opening of the annular body and the lug window of the surgical instrument to secure the loading unit to the distal end portion of the surgical instrument.