US 12,303,377 B2
Dynamic fixation implant and method of use
Sean Patrick Gill, Denver, CO (US); and Kaitlin Karas, Denver, CO (US)
Assigned to Paragon 28, Inc., Englewood, CO (US)
Filed by Paragon 28, Inc., Englewood, CO (US)
Filed on Mar. 14, 2022, as Appl. No. 17/693,665.
Application 17/693,665 is a continuation of application No. PCT/US2020/050438, filed on Sep. 11, 2020.
Claims priority of provisional application 62/899,559, filed on Sep. 12, 2019.
Prior Publication US 2022/0192817 A1, Jun. 23, 2022
Int. Cl. A61F 2/08 (2006.01)
CPC A61F 2/0811 (2013.01) [A61F 2002/0835 (2013.01); A61F 2250/0007 (2013.01)] 28 Claims
OG exemplary drawing
 
1. An implant, comprising:
a head portion at a proximal end of the implant, comprising external threads and a first axial through hole;
an anchor portion extending from the head portion at a distal end of the implant comprising external threads and a second axial through hole in communication with the first axial through hole; and
a flexible constraint member extending within the first and second axial through holes comprising a first end portion coupled to the head portion and a second end portion coupled to the anchor portion,
wherein at least one of the head portion and the anchor portions forms a breakaway portion configured to concentrate stress thereat such that the implant fractures at the breakaway portion via forces acting on the implant to separate the head and anchor portions, and
wherein the breakaway portion comprises an external circumferential groove and an internal circumferential groove axially aligned with the external groove, the internal circumferential groove formed between a radially-extending internal end surface portion of the head portion and a radially-extending internal end surface portion of the anchor portion, and
wherein the head portion and the anchor portion are separate and distinct components that are welded together at a weld zone that is axially adjacent to the external and internal circumferential grooves such that the weld zone is axially spaced from the radially-extending internal end surface portion of the head portion and the radially-extending internal end surface portion of the anchor portion.