US 12,274,479 B2
Cement delivery guides and corresponding fenestrated screws
Anela Camdzic Holdaway, Cordova, TN (US); Brian A. Butler, Millington, TN (US); William Alan Rezach, Covington, TN (US); Mark R. Grizzard, Munford, TN (US); Julien J. Prevost, Memphis, TN (US); and Aubrey R. Mills, Memphis, TN (US)
Assigned to WARSAW ORTHOPEDIC, INC., Warsaw, IN (US)
Filed by Warsaw Orthopedic, Inc., Warsaw, IN (US)
Filed on Jul. 8, 2022, as Appl. No. 17/860,303.
Prior Publication US 2024/0008909 A1, Jan. 11, 2024
Int. Cl. A61B 17/88 (2006.01); A61B 17/70 (2006.01); A61B 17/86 (2006.01)
CPC A61B 17/8816 (2013.01) [A61B 17/7032 (2013.01); A61B 17/7076 (2013.01); A61B 17/7098 (2013.01); A61B 17/864 (2013.01); A61B 17/8805 (2013.01); A61B 17/8811 (2013.01); A61B 17/8819 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A surgical tool for delivering bone cement, comprising:
a hollow outer sleeve having an elongated cylindrical shape, a first portion having a first inner diameter and a second portion having a second inner diameter, the first inner diameter being greater than the second inner diameter;
a hollow inner sleeve having an elongated cylindrical shape, the hollow inner sleeve being disposed inside of the hollow outer sleeve and having a first thread pattern adjacent a proximal end thereof and a coupling portion at a distal end thereof, the hollow inner sleeve being movable between a retracted position and an extended position;
a spring disposed in the first portion biases the hollow inner sleeve towards the retracted position; and
a hollow inner rod removably disposable within the hollow inner sleeve and having a distal end configured to guide a flowable material to a bone screw, the hollow inner rod including a second thread pattern having a size and shape corresponding to a size and shape of the first thread pattern;
wherein in the extended position the coupling portion extends beyond a distal end of the hollow outer sleeve and is configured to splay outward to surround and capture a head portion of the bone screw; and
wherein in the retracted position the coupling portion is moved inside of the distal end of the hollow outer sleeve and constrained from splaying outward thereby securely coupling the surgical tool to the head portion of the bone screw; and
wherein the hollow inner sleeve comprises a stop ring at a proximal end thereof configured to prevent the hollow inner sleeve from moving farther than the extended position.