US 11,832,821 B2
Surgical anvil assemblies for surgical stapling instruments
Joseph Guerrera, Watertown, CT (US); and Charles R. Kollar, Washington, DC (US)
Assigned to Covidien LP, Mansfield, MA (US)
Filed by Covidien LP, Mansfield, MA (US)
Filed on Jun. 29, 2021, as Appl. No. 17/362,155.
Application 17/362,155 is a continuation of application No. 16/275,622, filed on Feb. 14, 2019, granted, now 11,051,820.
Claims priority of provisional application 62/649,217, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,341, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,325, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,176, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,304, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,200, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,241, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,278, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,267, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,227, filed on Mar. 28, 2018.
Prior Publication US 2021/0322016 A1, Oct. 21, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 17/115 (2006.01); A61B 17/11 (2006.01); A61B 17/00 (2006.01); A61B 17/072 (2006.01); A61B 90/00 (2016.01)
CPC A61B 17/1155 (2013.01) [A61B 17/1114 (2013.01); A61B 90/03 (2016.02); A61B 2017/0046 (2013.01); A61B 2017/00314 (2013.01); A61B 2017/00473 (2013.01); A61B 2017/00477 (2013.01); A61B 2017/07235 (2013.01); A61B 2017/07257 (2013.01); A61B 2017/07271 (2013.01); A61B 2017/07285 (2013.01); A61B 2090/034 (2016.02); A61B 2090/037 (2016.02); A61B 2090/08021 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A ring assembly configured for receipt in an anvil head of a circular stapling instrument, the ring assembly comprising:
a backup member;
a first cut ring nested with the backup member and being fabricated from a first material, wherein the first cut ring is severable by an annular knife of the circular stapling instrument; and
a second cut ring embedded within the first cut ring and fabricated from a second material, wherein a distal edge of the annular knife engages the second cut ring after severing through the first cut ring during a firing of the circular stapling instrument.