Tibial tray inserter

Patent metadata

Field	Value
Publication number	US-12167972-B2
Application number	US-202318450667-A
Country	US
Kind code	B2
Filing date	Aug 16, 2023
Priority date	Feb 25, 2022
Publication date	Dec 17, 2024
Grant date	Dec 17, 2024

Abstract

Tibial implants, instruments, systems, and methods of implanting a tibial tray during a knee arthroplasty. The inserter instrument may include a main body with a pair of fixed posterior tabs, a moveable anterior tab body with an anterior tab, and a rotatable shaft for controlling movement of the anterior tab body. When the shaft is rotated, the anterior tab body is translated into an expanded position to lock the inserter to the tibial tray, thereby providing precise positioning of the tibial tray during implantation.

First claim

What is claimed is:

1. A method for performing a knee arthroplasty, the method comprising the steps of:
providing a tibial tray having a perimeter wall defining an insert receiving space, the perimeter wall defining a pair of posterior notches and a single anterior notch; and
providing an inserter having a main body with a pair of fixed posterior tabs, a moveable anterior tab body having an anterior tab, and a rotatable shaft for controlling movement of the anterior tab body, wherein the posterior tabs are receivable in the posterior notches of the tibial tray and the anterior tab is receivable in the anterior notch of the tibial tray when the shaft is rotated and the anterior tab body is translated into an expanded position,
wherein the main body of the inserter includes a foot with a neck protruding upwardly and an arm protruding anteriorly, wherein the foot is bifurcated by a keyway, and the anterior tab body is receivable in the keyway,
wherein the anterior tab body includes a pair of keyway wings projecting outwardly in opposite directions, wherein the keyway defines recesses configured to receive the respective keyway wings, thereby preventing anterior-posterior angulation while expansion occurs,
positioning the tibial tray within a tibia.

2. The method of claim 1 , wherein the tibial tray has a kidney-bean shape with an anterior side forming an outer convex side and a posterior side including an inner concave side separating two lobes.

3. The method of claim 1 , wherein the tibial tray includes a keel attached to a distal surface of the tibial tray, and the keel includes a pair of coronal fins and at least one sagittal fin.

4. The method of claim 1 , wherein the inserter includes a plurality of plugs press fit into the main body and the anterior tab body, wherein the plurality of plugs protrude from a bottom of the main body, thereby ensuring the main body does not contact the insert receiving space of the tibial tray.

5. A method of positioning a tibial tray using an inserter instrument comprising the steps of:
providing an inserter instrument having a main body of the inserter instrument coupled to a handle, the main body including a pair of posterior tabs;
a moveable anterior tab body inside the main body, the anterior tab body including a threaded opening and an anterior tab; and
a rotatable shaft for controlling movement of the anterior tab body, the shaft having a threaded portion engaged with the threaded opening in the anterior tab body, the shaft positioned through the main body and the anterior tab body, wherein when the shaft is rotated, the anterior tab body is translated outside the main body into a locked position,
wherein the main body includes a foot with a neck protruding upwardly and an arm protruding anteriorly,
wherein the foot is bifurcated by a keyway, and the anterior tab body is receivable in the keyway,
wherein the anterior tab body includes a pair of keyway wings projecting outwardly in opposite directions, wherein the keyway defines recesses configured to receive the respective keyway wings, thereby preventing anterior-posterior angulation while expansion occurs,
wherein the anterior tab body includes a base with an upwardly projecting tongue,

and the tongue defines the threaded opening;
using the inserter instrument to position the tibial tray in a tibia.

6. The method of claim 5 , wherein the foot has an outer kidney-bean shape.

7. The method of claim 5 , wherein the threaded opening is a triple lead threaded hole, and the shaft includes a triple lead shaft configured to interface with the triple lead threaded hole to increase translation speed of the anterior tab body.

8. The method of claim 5 , wherein the anterior tab is positioned along an anterior portion of the base, wherein the anterior tab extends along the entire width of the anterior tab body.

9. The method of claim 5 , wherein the handle includes an elongate body that terminates distally at a threaded end, wherein the threaded end mates with corresponding threads in the main body.

10. A method for implanting a tibial implant, the method comprising:
positioning fixed posterior tabs on a main body of an inserter into corresponding posterior notches in a perimeter wall of a tibial tray;
tilting the tibial tray until a foot of the main body of the inserter is received in an insert receiving space of the tibial tray;
rotating a shaft through the main body of the inserter to translate an anterior tab body and expand an anterior tab into an anterior notch in the tibial tray, thereby locking the inserter to the tibial tray;
moving the tibial tray to a desired position and implanting the tibial tray into a proximal tibia of a patient.

11. The method of claim 10 , wherein the inserter is configured to move the tibial tray with internal/external rotation, proximal/distal translation, anterior/posterior translation, anterior/posterior angulation, medial/lateral translation, and varus/valgus angulation.

12. The method of claim 10 , further comprising, before positioning the inserter, resecting the proximal tibial to form a planar resection surface.

13. The method of claim 10 , further comprising, before positioning the inserter, punching a cavity into the proximal tibia, the cavity being configured to receive a keel of the tibial tray.

14. The method of claim 10 , further comprising removing the inserter and attaching an insert with tabs receivable in the posterior and anterior notches in the tibial tray.

Assignees

• Globus Medical Inc

Inventors

• Cobani Marius
• Mike Drew
• Zappacosta Jason
• Stumpo David

Classifications

• A61B17/1764

  for the knee · CPC title

• A61F2002/4627

  with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument · CPC title

• A61F2002/30884

  Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity · CPC title

• A61F2002/30331

  made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit · CPC title

• A61F2002/30133

  kidney-shaped or bean-shaped · CPC title