Patent ID: 8852187
Filing Date: 2014-10-07
Classification: A61B,A61F

Abstract:
1. A method for treating a complex fracture with a variable length nail comprising a housing and a distraction shaft, the housing containing a rotatable permanent magnet mechanically coupled to a lead screw, the lead screw interfacing with a nut such that rotation of the lead screw in a first direction causes the distraction shaft to axially retract within the housing and rotation of the lead screw in a second direction causes the distraction shaft to axially extend from the housing, the method comprising: making a first hole or incision in the skin of the patient in proximity to a fractured long bone, wherein the fractured long bone was not purposely fractured and comprises at least several pieces of bone, and at least partially clearing a canal through the center of the long bone; inserting the variable length nail into the canal and securing the housing and distraction shaft to separate portions of the fractured long bone; causing or allowing the hole or incision to close; determining after causing or allowing the hole or incision to close that the fractured long bone is a substantially incorrect length, wherein the determining includes determining whether the long bone is incorrectly substantially long, whether the long bone is incorrectly substantially short, or whether the long bone is substantially the correct length; placing an external adjustment device in proximity to the patient's skin, the external adjustment device comprising at least one rotatable magnet; and operating the external adjustment device in response to the determining that the fractured long bone is a substantially incorrect length so that a magnetic field of the at least one rotatable magnet causes the rotatable permanent magnet of the variable length nail to rotate, causing the distraction shaft to either retract into or extend out of the housing.