System for preparing a patient's tibia in an orthopaedic joint replacement procedure

Patent metadata

Field	Value
Publication number	US-12059361-B2
Application number	US-202217987470-A
Country	US
Kind code	B2
Filing date	Nov 15, 2022
Priority date	May 18, 2016
Publication date	Aug 13, 2024
Grant date	Aug 13, 2024

Abstract

An orthopaedic joint replacement system is shown and described. The system includes a number of prosthetic components configured to be implanted into a patient's knee. The system also includes a number of surgical instruments configured for use in preparing the bones of the patient's knee to receive the implants. A method or technique for using the surgical instruments to prepare the bones is also disclosed.

First claim

The invention claimed is:

1. An orthopaedic surgical instrument system comprising:
a first surgical reamer including an elongated shaft and a plurality of cutting flutes defined at a distal end of the elongated shaft, the first reamer being configured to ream an intramedullary canal of a patient's tibia to a first predetermined depth along a first ream axis,
a tibial base plate including a central opening extending along a first longitudinal axis,
a second surgical reamer including an elongated shaft and a plurality of cutting flutes defined at a distal end of the elongated shaft, wherein the plurality of cutting flutes define (i) a distal frustoconical cutting section, (ii) a proximal cutting section having a first diameter, and (iii) a cylindrical middle cutting section having a second diameter smaller than the first diameter, the second reamer being configured to ream the patient's tibia to a second predetermined depth along a second ream axis, wherein the second predetermined depth is less than the first predetermined depth and the second ream axis is offset from the first ream axis,
a reamer guide body having a passageway defined therein that is sized to receive the elongated shaft of the second reamer so as to align the second reamer along the second ream axis and configured to be substantially aligned with the central opening of the tibial base plate when the reamer guide body is positioned on the tibial base plate.

2. The orthopaedic surgical instrument system of claim 1 , further comprising:
an offset guide including an upper drum, a lower plate sized to be positioned in the central opening of the tibial base plate, and a bore extending through the offset guide along a second longitudinal axis that is offset from the first longitudinal axis of the tibial base plate when the offset guide is positioned on the tibial base plate, the bore being sized to receive the elongated shaft of the first reamer, wherein the offset guide is operable to rotate such that the lower plate of the offset guide engages the tibial base plate to rotate the tibial base plate about the second longitudinal axis.

3. The orthopaedic surgical instrument system of claim 1 , wherein:
the tibial base plate includes a pair of fixation bores,
the reamer guide body includes a pair of fixation pins, and
each of the fixation pins extends downwardly from a bottom surface of the guide body and is sized to be received in and extend outwardly from each of the fixation bores of the tibial base plate when the guide body is positioned on the tibial base plate.

4. The orthopaedic surgical instrument system of claim 1 , further comprising:
a second tibial base plate including a central opening and a pair of slots extending outwardly from the central opening, and
a punch instrument including a pair of arms sized to be positioned in the pair of slots of the second tibial base plate, each arm including a plurality of cutting teeth.

5. The orthopaedic surgical instrument system of claim 4 , further comprising an impaction handle including a locking flange configured to pivot between a locked position and an unlocked position,
wherein the punch instrument includes a plate configured to engage the locking flange when the locking flange is in the locked position.

6. The orthopaedic surgical instrument system of claim 5 , wherein the impaction handle further includes:
a proximal post extending along a longitudinal axis,
a bracket coupled to the proximal post and operable to move along the longitudinal axis relative to the post, the bracket having an elongated slot defined therein,
a lever arm that is pivotally coupled to the proximal post, the lever arm including the locking flange and a tab positioned in the elongated slot defined in the bracket,
wherein when the bracket is moved in a distal direction along the longitudinal axis, the tab is advanced along the elongated slot and the lever arm is pivoted from the locked position to the unlocked position.

7. The orthopaedic surgical instrument system of claim 6 , further comprising a biasing element operable to bias the lever arm in the locked position.

Assignees

• Depuy Ireland Ultd Co

Inventors

• Wolfson David R
• Barnett James E
• Penninger Charles L
• Hathaway Tyler S
• Carver Adam
• Reeve Michael R
• Robertson Lisa M
• Miltner Nicholas A
• Wogoman Thomas E

Classifications

• A61B17/1764

  for the knee · CPC title

• A61F2/4603

  for insertion or extraction of endoprosthetic joints or of accessories thereof · CPC title

• A61F2002/4687

  Mechanical guides for implantation instruments · CPC title

• A61F2002/3863

  Condyles fitted on an anchored base · CPC title

• A61F2002/30736

  Augments or augmentation pieces, e.g. wedges or blocks for bridging a bone defect · CPC title