US 12,144,524 B2
Stabilizing bones using screws and rods
Caelan Allen, Philadelphia, PA (US); Matthew Bechtel, Philadelphia, PA (US); Noah Hansell, King of Prussia, PA (US); Stefan Lamers, Phoenixville, PA (US); David Leff, Philadelphia, PA (US); David Peretz, Wynnewood, PA (US); and George Yacoub, Conshohocken, PA (US)
Assigned to Globus Medical, Inc., Audubon, PA (US)
Filed by GLOBUS MEDICAL, INC., Audubon, PA (US)
Filed on Mar. 25, 2022, as Appl. No. 17/704,567.
Application 17/704,567 is a continuation of application No. 17/704,496, filed on Mar. 25, 2022.
Prior Publication US 2023/0301686 A1, Sep. 28, 2023
Int. Cl. A61B 17/70 (2006.01); A61B 17/86 (2006.01)
CPC A61B 17/7034 (2013.01) [A61B 17/7032 (2013.01); A61B 17/7037 (2013.01); A61B 17/7038 (2013.01); A61B 17/7082 (2013.01); A61B 17/8685 (2013.01); A61B 17/8695 (2013.01); A61B 17/863 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An orthopedic fixation device for affixing the screw head of a polyaxial pedicle screw, including:
a tulip defining a distal and proximal end and forming
a tulip body forming an interior cavity, the tulip body having a tulip ledge at a distal portion of the tulip body,
two opposed arms extending away from a proximal end of the body,
cooperating threads disposed on mutually facing sides of each arm, and
a ramp positioned at a distal end of the tulip body at an entrance to the cavity;
a saddle defining a distal and proximal end, the saddle
sized and dimensioned to be insertable into the tulip body,
forming a U shaped groove on the saddle proximal end sized to receive a spinal fixation rod inserted between the tulip arms,
forming a mating connection portion on a peripheral surface of a distal end; and
a ring for engaging the screw head, the ring
having a tulip detent portion on an upper portion and a lower flange on a lower portion, the lower flange having a first diameter smaller than the widest diameter of the screw head,
the lower flange formable into a second diameter larger than the widest diameter of the screw head when the screw head is passed into the ring,
including a mating connection portion mateable with the mating connection portion of the saddle, whereby the ring and the saddle are mutually releaseably connectable, and
having a ramp cooperative with the ramp of the tulip;
the screw head clampable within the tulip body interior cavity in a position between the saddle and the ring when the saddle is urged in a distal direction towards the tulip ledge and the ramp of the ring slides against the ramp of the tulip,
wherein the ring is initially retained in the tulip body via the tulip detent portion being engaged with a first detent portion in the tulip body, and as the screw head is pushed to expand the lower flange to the second diameter, the tulip detent portion disengages from the first detent portion and the lower flange returns to the first diameter to retain the screw head in the tulip body.