US 11,771,428 B2
Actuation shaft retention mechanism for surgical stapler
Jonathan Von Stein, Rancho Santa Margarita, CA (US); Kimball B. McGinley, Rancho Santa Margarita, CA (US); Robert Bradshaw, Rancho Santa Margarita, CA (US); Alan Bylund, Rancho Santa Margarita, CA (US); Christian A. Halvorsen, Rancho Santa Margarita, CA (US); and Jonathan R. Nash, Rancho Santa Margarita, CA (US)
Assigned to Applied Medical Resources Corporation, Rancho Santa Margarita, CA (US)
Filed by Applied Medical Resources Corporation, Rancho Santa Margarita, CA (US)
Filed on Oct. 29, 2021, as Appl. No. 17/514,358.
Claims priority of provisional application 63/107,112, filed on Oct. 29, 2020.
Prior Publication US 2022/0133317 A1, May 5, 2022
Int. Cl. A61B 17/072 (2006.01); A61B 17/00 (2006.01)
CPC A61B 17/07207 (2013.01) [A61B 2017/0046 (2013.01); A61B 2017/00398 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A handle assembly for a surgical stapler, the handle assembly comprising:
a handle body, the handle body comprising a stationary handle and a trigger pivotably coupled to the handle body;
an electric motor disposed within the handle body;
an actuation shaft slidable within the handle body along a longitudinal axis and rotatable within the handle body about the longitudinal axis, the actuation shaft comprising a rack formed thereon;
a mechanical return mechanism; and
a retention mechanism configured to restrict distal longitudinal advancement of the actuation shaft upon actuation of the mechanical return mechanism;
wherein the retention mechanism comprises a plurality of fins extending transversely to the longitudinal axis, the plurality of fins frictionally engaging the actuation shaft upon actuation of the mechanical return mechanism.