US 12,458,350 B2
Staple cartridge with retractable knife assembly
Ping Ren, Shanghai (CN); Syed Sarfraz Ahamed, Shanghai (CN); and Jiangfeng Zhang, Shanghai (CN)
Assigned to Covidien LP, Mansfield, MA (US)
Appl. No. 17/907,886
Filed by Covidien LP, Mansfield, MA (US)
PCT Filed Feb. 28, 2020, PCT No. PCT/CN2020/077059
§ 371(c)(1), (2) Date Aug. 29, 2022,
PCT Pub. No. WO2021/168761, PCT Pub. Date Sep. 2, 2021.
Prior Publication US 2023/0111381 A1, Apr. 13, 2023
Int. Cl. A61B 17/072 (2006.01); A61B 90/00 (2016.01)
CPC A61B 17/072 (2013.01) [A61B 2017/07221 (2013.01); A61B 2017/07271 (2013.01); A61B 2017/07285 (2013.01); A61B 2090/0801 (2016.02)] 15 Claims
OG exemplary drawing
 
1. A cartridge assembly comprising:
a cartridge body defining a cavity, a knife slot, a plurality of staple pockets, and a tissue engaging surface, the knife slot and the plurality of staple pockets extending between the tissue engaging surface and the cavity;
a plurality of staples, each of the plurality of staples received within one of the plurality of staple pockets;
a staple pusher supported within the cavity of the cartridge body, the staple pusher movable from a retracted position to an advanced position to eject the plurality of staples from the plurality of staple pockets of the cartridge body;
a knife holder supporting a knife blade and defining a recess, the knife holder positioned within the cavity of the cartridge body and movable between a retracted position and an advanced position to move the knife blade from a retracted position recessed within the cartridge body to an advanced position extending from the knife slot; and
a biasing member receivable within the recess and positioned between the knife holder and the staple pusher within the cartridge body, the biasing member configured to urge the knife holder and the knife blade towards their retracted positions, and the biasing member comprising a first spring arm having a first ring member engaged with the knife holder and a second spring arm with a second ring member engaged with the staple pusher.