Knee replacement implants and instruments
AssigneeGlobus Medical, Inc.
InventorsJason Zappacosta, David Stumpo, Ryan Conley
Life of this patent
Estimating the term…
Abstract
Knee arthroplasty implants, instruments, systems, and methods of implanting the same. The knee arthroplasty implants may include a femoral implant and a tibial tray implant, each with trabecular surfaces configured to contact bone to provide a scaffold for bone healing and interdigitation. The implants may also include fixation pegs with bulleted profiles to increase the surface area for bone ingrowth. An inserter instrument may include a sliding rack, which is incrementally extended with a rotatable shaft, thereby allowing for quick lock and release of various tibia trays.
Claims20
A knee arthroplasty implant system comprising:
- a femoral implant having an anterior flange, a pair of posterior condylar flanges, and a distal portion therebetween, the femoral implant has an outer articulating surface with a smooth rounded shape that closely approximates an exterior distal femur surface of a natural human knee and an inner surface shaped to match a resected femur with five resection cuts, and one or more pegs extending from the inner surface;
- and
- a tibial tray implant having a plate with a perimeter wall defining an insert receiving space, a distal surface configured to contact a resected tibia, a keel extending from the distal surface, and one or more pegs extending from the distal surface,
- wherein the inner surface of the femoral implant and the distal surface of the tibial tray define a trabecular structure, which provides a scaffold for bone healing and interdigitation.
A system for a knee arthroplasty, the system comprising:
- 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
- an inserter having a main body with a foot having a pair of fixed posterior tabs, a sliding rack having an anterior tab, and a rotatable shaft for controlling movement of the sliding rack, 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 sliding rack is translated into an extended position.
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 inserter 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 a sliding rack having an anterior tab and extend the anterior tab into an anterior notch in the tibial tray, thereby locking the inserter to the tibial tray;
- and
- impacting an impaction cap to seat the tibial tray into a proximal tibia of a patient.
Dependencies are inferred from the claim text.