US 12,465,419 B2
Rotation assembly for energy-based surgical instruments
Amir Roomi, Boulder, CO (US)
Assigned to Covidien LP, Mansfield, MA (US)
Filed by Covidien LP, Mansfield, MA (US)
Filed on Nov. 8, 2021, as Appl. No. 17/521,694.
Application 17/521,694 is a continuation in part of application No. 17/122,062, filed on Dec. 15, 2020, granted, now 11,806,068.
Prior Publication US 2022/0183743 A1, Jun. 16, 2022
Int. Cl. A61B 18/14 (2006.01); A61B 18/00 (2006.01)
CPC A61B 18/149 (2013.01) [A61B 2018/00178 (2013.01); A61B 2018/00202 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A rotation assembly for a surgical instrument, comprising:
a first body and a second body, one of the first body or the second body fixedly disposed within a housing of the surgical instrument and defining a central bore configured to rotatably receive a shaft of the surgical instrument, the other of the first body or second body rotatably disposed within the housing and fixedly disposed about the shaft, wherein the shaft extends distally from and is rotatable relative to the housing;
an inner contact ring fixedly disposed on the first body and including a first electrical connector coupled thereto; and
an outer contact ring fixedly disposed on the first body and including a second electrical connector coupled thereto, the outer contact ring electrically isolated from the inner contact ring;
a first spring contact and a second spring contact configured to maintain electrical contact with the inner contact ring and the outer contact ring, respectively, wherein each of the first spring contact and the second spring contact includes:
a substructure including a brush holder positioned towards a first end portion thereof and an extension positioned towards a second end portion thereof;
an electrical connector disposed on the extension;
a brush slidably disposed partially within the brush holder, the brush including a contact portion extending from the brush holder and configured to establish electrical contact with the inner or outer contact ring; and
a spring disposed at least partially within the brush holder and configured to bias the brush towards the inner or outer contact ring to maintain electrical contact therebetween.