US 12,251,148 B2
Tri-roll thread electric surgical impact tool
Alexander Slocum, Bow, NH (US)
Assigned to Zimmer, Inc., Warsaw, IN (US)
Filed by Zimmer, Inc., Warsaw, IN (US)
Filed on Jan. 31, 2022, as Appl. No. 17/589,456.
Claims priority of provisional application 63/144,285, filed on Feb. 1, 2021.
Prior Publication US 2022/0240998 A1, Aug. 4, 2022
Int. Cl. A61B 17/92 (2006.01); B25D 11/10 (2006.01); A61B 17/00 (2006.01)
CPC A61B 17/92 (2013.01) [B25D 11/102 (2013.01); B25D 11/104 (2013.01); B25D 11/106 (2013.01); A61B 2017/00203 (2013.01); A61B 2017/00398 (2013.01); A61B 2017/00734 (2013.01); A61B 2017/925 (2013.01); A61B 2017/928 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A surgical impact tool comprising:
a motor;
a roller assembly operatively connected to the motor and comprising a plurality of rollers, each of the plurality of rollers supported by a respective one of a plurality of roller arms;
an impact structure defining a spring and an impact cavity including forward and reverse impact surfaces disposed on opposite ends of the impact cavity, the impact structure comprising a wall comprising a plurality of thread elements connected to the wall and engageable with the roller assembly, each of the thread elements including a pair of helical end surfaces and a pair of axially extending surfaces that are engaged by the plurality of rollers;
a tool holder comprising an impact flange disposed within the impact cavity in between the forward and reverse impact surfaces; and
wherein, during use:
rotation of the roller assembly against the helical end surfaces of the thread elements causes axial movement of the impact structure to apply a load on the spring, and
engagement of the roller assembly against the pair of axially extending surfaces of the thread elements allows the spring to be unloaded and cause the impact structure to engage the impact flange.