US 11,051,820 B2
Surgical anvil assemblies for surgical stapling instruments
Joseph Guerrera, Watertown, CT (US); and Charles R. Kollar, West Hartford, CT (US)
Assigned to Covidien LP, Mansfield, MA (US)
Filed by Covidien LP, Mansfield, MA (US)
Filed on Feb. 14, 2019, as Appl. No. 16/275,622.
Claims priority of provisional application 62/649,227, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,176, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,341, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,325, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,304, 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 62/649,241, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,217, filed on Mar. 28, 2018.
Claims priority of provisional application 62/649,200, filed on Mar. 28, 2018.
Prior Publication US 2019/0298369 A1, Oct. 3, 2019
Int. Cl. A61B 17/115 (2006.01); A61B 17/00 (2006.01); A61B 17/072 (2006.01)
CPC A61B 17/1155 (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)] 9 Claims
OG exemplary drawing
 
1. A surgical anvil assembly for use with a circular stapling instrument, comprising:
an anvil center rod;
an anvil head pivotally coupled to the anvil center rod and movable between a first, operative condition and a second, tilted condition; and
a ring assembly disposed within a recess of the anvil head and movable within the recess from a proximal position preventing pivotal movement of the anvil head from the first, operative condition, to a distal position permitting pivotal movement of the anvil head to the second, tilted condition, wherein the ring assembly includes:
a backup member configured to engage the anvil center rod when the ring assembly is in the proximal position;
a first cut ring nested with the backup member and being fabricated from a first material, the first cut ring defining a recess therein; and
a second cut ring disposed within the recess such that the second cut ring is disposed within the first cut ring, the second cut ring being fabricated from a second material that is softer than the first material.