Patent ID: 9456857
Filing Date: 2016-10-04
CPC Classification: A61B

Claim Text:
1. An implantable apparatus for internally stabilizing long bone fractures, said apparatus comprising: a helical rod configured for placement into a marrow cavity of a long bone in a lengthwise direction by a manipulation device, the helical rod having a vertical spring rate in a range of about 1500-5000 N/mm to provide the helical rod with a high rigidity such that no change in length occurs in a longitudinal direction of the helical rod when the helical rod is in the marrow cavity of the long bone; the helical rod having a bending spring rate that allows bending of the helical rod transverse to its longitudinal direction in a range of less than 1 mm, the helical rod being a section of helical rod material having a bending spring rate chosen such that a 300 mm length of said helical rod material, if clamped at a proximal end thereof, would exhibit a force-to-deflection ratio at a distal end thereof ranging between about 250 and 1250 mN/mm; the helical rod further comprising a head forming a screwing region, the head being adapted to the long bone and having a diameter which is independent of an outer diameter of the helical rod.