Systems and methods for attaching sleeve or cone in prosthetic implant having a stem

Patent metadata

Field	Value
Publication number	US-10987225-B2
Application number	US-201816047463-A
Country	US
Kind code	B2
Filing date	Jul 27, 2018
Priority date	Aug 4, 2017
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

A prosthetic implant system for reconstructing a knee joint comprises a prosthetic implant and sleeve. The prosthetic implant comprises a tibial tray component for reconstructing a tibia of the knee joint, and a stem configured to extend from the tibial tray component to anchor the tibial tray component in the tibia of the knee joint. The sleeve comprises an outer wall configured to engage with bone, and an inner bore configured to receive the stem. The inner bore is shaped to couple to the prosthetic implant at a first location proximate the tibial tray component while surrounding the stem, and uncouple from the prosthetic implant at a second location spaced from the first location while still surrounding the stem. Methods employing the prosthetic implant system can comprise intraoperatively determining to use the sleeve in a coupled or un-coupled configuration based on a depth of a broach into a broached channel.

First claim

The claimed invention is:

1. A method of intraoperatively evaluating a tibia for implanting a tibial component of a prosthetic knee device; the method comprising:
planning a procedure to use a stem sleeve coupled to a tibial stem to engage a broached channel;
reaming an intramedullary canal into a proximal end of a tibia to form a channel;
resecting a proximal portion of the tibia to form a planar resected surface;
broaching the channel to form a broached channel such that a top of the broached channel is located a distance below the planar resected surface;
evaluating if the distance is sufficiently small to support using a stem sleeve in a coupled state;
determining that the distance is too large to support using the stem sleeve in a coupled state; and
inserting the stem sleeve into the broached channel to engage the broached channel; and
positioning the tibial stem through the stem sleeve such that there is a gap between the tibial stem and the stem sleeve;
wherein evaluating if the distance is sufficiently small comprises evaluating if the stem sleeve can simultaneously engage the broached channel and the stem of the tibial component when engaged with a bottom of the broached channel.

2. The method of claim 1 , further comprising broaching the channel to form a distal taper portion configured to engage the broached channel, the distal taper portion forming the top of the broached channel.

3. The method of claim 2 , wherein broaching the channel to form the broached channel comprises broaching the channel to form a proximal longitudinal portion that positions the distal taper portion below the planar resected surface by the distance.

4. The method of claim 1 , wherein inserting the stem sleeve into the broached channel further comprises disposing bone cement within the proximal longitudinal portion.

5. The method of claim 1 , further comprising:
using the stem sleeve in a coupled state when the distance is in the range of 0 mm to 0.5 mm; and
using the stem sleeve in an un-coupled state when the distance is greater than 0.5 mm up to 2.5 mm.

6. A method of intraoperatively switching between using a tibial component sleeve and a tibial component cone for implanting a tibial component of a prosthetic knee device during a procedure, the method comprising:
reaming an intramedullary canal in a proximal end of a tibia to form a channel;
resecting a proximal portion of the tibia to form a planar resected surface commensurate with using a sleeve;
broaching the channel to form a broached channel such that a top of the broached channel is located a distance below the planar resected surface;
determining that the broached channel is inappropriate for using a sleeve attached to the tibial component to engage the broached channel by determining that bone quality in the broached channel proximate the planar resected surface is poor or determining that the broached channel is located too far below the planar resected surface; and
inserting a cone into the broached channel to engage the broached channel below the planar resected surface without resecting additional bone; and
inserting the tibial component into the channel without engaging the cone.

7. The method of claim 6 , further comprising:
intraoperatively having a cone and a sleeve ready and available at a beginning of the procedure.

8. A method of implanting an implant including a stem, the method comprising:
reaming an intramedullary canal of a long bone to form a channel;
resecting an epiphysis portion of the long bone to form a resected surface;
broaching a proximal end of the long bone to form a broached channel;
evaluating a depth of the broach below the resected surface;
determining to use a stem sleeve in a coupled or un-coupled state based on the depth of the broach, wherein the stem sleeve comprises:
a proximal surface;
a distal surface;
an exterior surface connecting the proximal surface and the distal surface an inner bore connecting the proximal surface and the distal surface within the exterior surface, the inner bore defining a Morse taper; and
a plurality of indentations in the proximal surface having a shape to prevent rotation of the stem sleeve when filled with bone cement;

inserting the stem sleeve into the broached channel for the un-coupled state or attaching the stem sleeve onto the stem of the implant for the coupled state; and
inserting the implant into the broached channel; wherein:
the stem sleeve is implanted in a coupled state when the depth is in the range of 0 mm to 0.5 mm; and
the stem sleeve is implanted in an un-coupled state when the depth is greater than 0.5 mm up to 2.5 mm.

9. The method of claim 8 , wherein the broached channel comprises:
a distal taper portion; and
a proximal longitudinal portion.

10. The method of claim 9 , wherein evaluating the depth of the broach comprises determining visibility of the proximal longitudinal portion above the broach.

11. The method of claim 9 , wherein the stem sleeve is positioned to at least partially surround a stem housing that receives the stem in the coupled state and the un-coupled state.

12. The method of claim 9 , further comprising disposing bone cement within the broached channel between the proximal surface of the sleeve and a distal surface of the tibial implant within the proximal longitudinal portion.

13. The method of claim 9 , further comprising disposing bone cement within the broached channel between concentric surfaces of the tibial implant and the sleeve within the distal taper portion.

14. The method of claim 9 , wherein:
inserting the tibial stem sleeve into the broached channel comprises engaging bone within the distal taper portion of the broached channel with the tibial stem sleeve; and
inserting the tibial implant into the broached channel comprises leaving a space between the inner bore in the tibial stem sleeve and the tibial stem.

15. The method of claim 14 , wherein engaging bone within the distal taper portion of the broached channel with the tibial stem sleeve comprises engaging a porous structure of the exterior surface of the tibial stem sleeve with the bone.

16. The method of claim 8 further comprising disposing bone cement within the indentations of the tibial stem sleeve.

17. The method of claim 8 , wherein:
attaching the stem sleeve onto the stem of the implant comprises engaging the Morse taper with the stem of the tibial implant; and
inserting the tibial implant into the broached channel comprises engaging the tibial stem and the tibial stem sleeve with bone inside the broached channel.

18. The method of claim 16 , further comprising preventing rotation of the stem sleeve relative to the tibial tray by disposing bone cement within claw-shaped indentations.

19. The method of claim 8 , further comprising leaving the stem sleeve and the implant in the long bone in either the coupled state or the un-coupled state after the method of implanting is completed.

Assignees

• Zimmer Inc

Inventors

• Yoko Tim
• Szalkowski Amanda

Classifications

• A61F2/389

  Tibial components (A61F2/3868 takes precedence) · CPC title

• A61F2002/30738

  Sleeves · CPC title

• A61F2002/30332

  Conically- or frustoconically-shaped protrusion and recess · CPC title

• A61F2002/30604

  modular · CPC title

• A61F2/30734 Primary

  Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect · CPC title