US 11,832,823 B2
Determination of anvil release during anastomosis
Haley E. Strassner, Hamden, CT (US); Alexander J. Hart, Tolland, 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 Feb. 8, 2022, as Appl. No. 17/666,652.
Prior Publication US 2023/0248365 A1, Aug. 10, 2023
Int. Cl. A61B 17/064 (2006.01); A61B 17/115 (2006.01); A61B 90/00 (2016.01); A61B 17/00 (2006.01)
CPC A61B 17/1155 (2013.01) [A61B 2017/00398 (2013.01); A61B 2090/065 (2016.02)] 14 Claims
OG exemplary drawing
 
1. A surgical device comprising:
a reload assembly including a plurality of staples;
an anvil assembly movable relative to the reload assembly, the anvil assembly including:
a rod;
an anvil head pivotable from a tilt position to a non-tilt position relative to the rod; and
a retainer configured to maintain the anvil head in the non-tilt position;
a power source;
a motor coupled to the power source;
a transmission assembly movable by the motor and configured to move the anvil assembly relative to the reload assembly;
a strain sensor configured to measure strain imparted on the transmission assembly; and
a controller configured to:
determine the anvil assembly has tilted based on a change in measured strain in response to at least one of deformation or breakage of the retainer; and
determine whether the anvil assembly is adhered to tissue grasped between the reload assembly and the anvil assembly based on the measured strain.