IMPLANT SYSTEM WITH PE INSERT AND TWO TRAY OPTIONS

• US 20140257504A1
• Filed: 03/11/2013
• Published: 09/11/2014
• Est. Priority Date: 03/11/2013
• Status: Active Grant

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Inventors: Dong, Nicholas Nai Guang, Poggie, Matthew P., Schmidt, Walter
• Granted Patent: US 9,757,242 B2
• Time in Patent Office: Days
• US Class Current: 623/20.32
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations

Abstract

A tibial implant system has an ultra-high molecular weight polyethylene tibial insert which can engage with either one of two tibial trays through differing means of engagement. The tibial insert includes a locking wire and locking tab disposed along an anterior surface and a locking recess disposed along a posterior surface. A first polymeric tibial tray includes a bead along an anterior wall and an undercut area along a posterior wall. A second metallic tibial tray includes a plurality of barbs along an anterior wall and an undercut area along a posterior wall.

Claims

1. A tibial implant system comprising

a polymeric tibial insert having a locking feature disposed along an anterior surface and a locking feature disposed along a posterior surface,

a first tibial tray, made of a polymer, having a bead along an anterior wall and an undercut area along a posterior wall, and

a second tibial tray, made of a metal, having a plurality of barbs along an anterior wall and an undercut area along a posterior wall,

wherein the anterior and posterior surfaces of the tibial insert are configured to lockingly engage, respectively, with both the first or second tibial tray anterior and posterior walls, and

wherein engagement areas between the anterior surface of the polymeric tibial insert and the anterior wall of the first tray differs in shape from the engagement areas between the anterior surface and the second tibial tray anterior wall.

2. The tibial implant system of claim 1,

wherein the locking feature disposed along an anterior surface includes a locking wire mounted in an anterior recess and a locking tab mounted below the locking wire.

3. The tibial implant system of claim 1,

wherein the locking feature disposed along a posterior surface includes a locking recess.

4. The tibial implant system of claim 1,

wherein the polymeric first tibial tray comprises PEEK.

5. The tibial implant system of claim 1,

wherein the anterior wall of the first tibial tray can resiliently deflect when the locking tab engages the bead where, upon engagement of the first tibial tray and the tibial insert, the bead extends into the anterior recess in the tibial insert under the locking wire.

6. The tibial implant system of claim 1,

wherein the anterior surface of the tibial insert is held in secure engagement with the first tibial tray anterior wall through communication of the bead over the locking tab.

7. The tibial implant system of claim 1,

wherein the locking wire resiliently deflects posteriorly when the locking wire engages at least one of the plurality of barbs on the second tibial tray.

8. The tibial implant system of claim 1,

wherein the anterior surface of the tibial insert is securely held with the second tibial tray by movement of at least one of the plurality of barbs over the locking wire.

9. The tibial implant system of claim 1,

wherein the posterior surface of the tibial insert is held in secure engagement with the posterior walls of the first or second tibial trays through engagement of the locking tibial insert locking recess into the respective undercut areas.

10. The tibial implant system of claim 1,

wherein the locking feature along the anterior wall of the first tibial tray extends continuously over a major portion of the anterior wall thereof.

11. The tibial implant system of claim 1, wherein the polymeric first tibial tray comprises PAEK.