US 12,004,785 B2
Retrograde femoral intramedullary nail, and related systems and methods
Rohit Shinde, Irvine, CA (US); Thomas Keyer, West Chester, PA (US); David Cowens, West Chester, PA (US); Joshua McManus, Downingtown, PA (US); Raymond Schmitt, West Chester, PA (US); Michael Bushelow, West Chester, PA (US); Stanley J. Kmiec, Jr., Morgantown, PA (US); and Josef Gabelberger, West Chester, PA (US)
Assigned to DePuy Synthes Products, Inc., Raynham, MA (US)
Filed by DEPUY SYNTHES PRODUCTS, INC., Raynham, MA (US)
Filed on Apr. 21, 2022, as Appl. No. 17/725,865.
Prior Publication US 2023/0338066 A1, Oct. 26, 2023
Int. Cl. A61B 17/72 (2006.01); A61B 17/17 (2006.01); A61B 17/74 (2006.01)
CPC A61B 17/7241 (2013.01) [A61B 17/1725 (2013.01); A61B 17/744 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A retrograde intramedullary nail for retrograde insertion in the medullary canal of a femur, comprising:
a body that is elongate and defines a leading end and a trailing end spaced from each other at a length sufficient to extend from an intercondylar region of the femur at least to a subtrochanteric region of the femur, the body further defining a leading portion that extends to the leading end,
wherein the leading portion defines at least one locking hole configured to receive a fixation member, wherein the at least one locking hole defines a central hole axis, and the leading portion is configured such that the central hole axis extends through the neck of the femur and intersects the head of the femur, and
wherein the body defines,
an exterior surface having a primary surface portion that is substantially cylindrical within the leading portion; and
at least one relief formation that deviates from the primary surface portion and is configured to reduce stress concentrations in the leading portion, wherein the at least one relief formation comprises a plurality of annular protrusions that extend outwardly from the primary surface portion.