US 12,232,768 B2
Cannula for preventing tumor seeding
William J. Dickhans, Longmont, CO (US)
Assigned to Covidien LP, Mansfield, MA (US)
Appl. No. 17/631,685
Filed by Covidien LP, Mansfield, MA (US)
PCT Filed Jun. 12, 2020, PCT No. PCT/US2020/037400
§ 371(c)(1), (2) Date Jan. 31, 2022,
PCT Pub. No. WO2021/029955, PCT Pub. Date Feb. 18, 2021.
Claims priority of provisional application 62/885,366, filed on Aug. 12, 2019.
Prior Publication US 2022/0273339 A1, Sep. 1, 2022
Int. Cl. A61B 17/34 (2006.01); A61B 10/02 (2006.01); A61B 17/00 (2006.01)
CPC A61B 17/3431 (2013.01) [A61B 10/0233 (2013.01); A61B 2017/00367 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A cannula for use in a surgical procedure, the cannula comprising:
a tubular shaft having a distal end portion and defining a longitudinal passageway;
a first groove extending longitudinally along the distal end portion of the tubular shaft;
a pair of laterally-spaced distal extensions attached to the distal end portion of the tubular shaft by a frangible connection; and
at least one tether coupled to the pair of laterally-spaced distal extensions, the distal end portion configured to break or bend about the first groove in response to a threshold proximally-oriented force applied to the at least one tether, wherein the proximally-oriented force pivots the pair of laterally-spaced distal extensions inwardly toward each other to separate the pair of distal extensions from the tubular shaft at the frangible connection and everts the pair of laterally-spaced distal extensions into the longitudinal passageway of the tubular shaft.