US 11,653,925 B2
Tissue relaxation monitoring for optimized tissue stapling
Haley Strassner, Hamden, CT (US); David E. Valentine, Hamden, CT (US); Alexander J. Hart, Tolland, CT (US); Stephen R. Casey, Wallingford, CT (US); Sonya A. Bader, Plainville, MA (US); James P. Delbo, North Haven, CT (US); Charles R. Kollar, Washington, DC (US); Drew R. Seils, Guilford, CT (US); and Steven H. Joyce, Durham, CT (US)
Assigned to COVIDIEN LP, Mansfield, MA (US)
Filed by Covidien LP, Mansfield, MA (US)
Filed on May 6, 2021, as Appl. No. 17/313,833.
Claims priority of provisional application 63/028,136, filed on May 21, 2020.
Prior Publication US 2021/0361288 A1, Nov. 25, 2021
Int. Cl. A61B 17/115 (2006.01); A61B 34/00 (2016.01); A61B 17/00 (2006.01); A61B 17/072 (2006.01)
CPC A61B 17/1155 (2013.01) [A61B 34/76 (2016.02); A61B 2017/00022 (2013.01); A61B 2017/00119 (2013.01); A61B 2017/07257 (2013.01); A61B 2017/07271 (2013.01); A61B 2017/07285 (2013.01); A61B 2562/0261 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A circular stapling device comprising:
a handle assembly including a processor;
an adapter assembly operably secured to the handle assembly and including a trocar assembly and a strain gauge assembly;
a reload assembly operably secured to the adapter assembly, the reload assembly including a staple cartridge;
an anvil assembly releasably secured to the trocar assembly and moveably positioned relative to the staple cartridge between a spaced position and a clamped position; and
a memory including instructions stored thereon, which when executed by the processor cause the circular stapling device to:
capture a plurality of strain gauge value measurements at a predetermined sampling rate for tissue clamped between the staple cartridge and the anvil assembly;
determine a differential change in force based on subtracting consecutively sampled strain gauge value measurements from each other;
determine a percentage change in force based on dividing the differential change in force by a previous strain gauge measurement value;
determine a percent reduction based on averaging the percent change in force;
determine if the percent reduction is equal to or less than a predetermined threshold value, wherein the predetermined threshold value indicates a tissue relaxation; and
initiating a stapling sequence when the percent reduction is equal to or is less than the predetermined threshold value.