IP Library › Granted Patent US 12,274,452
Granted Patent B2
US 12,274,452 · App. 18/347,047 · Granted Apr 15, 2025

Surgical kit for tibial resection and replacement

Inventor: Nam T. Chao (Marlborough, MA)
Assignee: ConforMIS, Inc.
A61B17/157
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Quick Facts
Patent No.
US 12,274,452
App. No.
18/347,047
Granted
Apr 15, 2025
Kind
B2
Abstract

Various patient-specific tibial guide housings, patient-specific tibial guide boxes, and methods of resecting the tibial plateau are disclosed herein.

Claims (48)

1. A system for treating a tibia of a patient, the system comprising:

a tibial implant intended to replace at least a portion of the tibia of the patient;

a tibial guide housing, the tibial guide housing comprising:

a top side generally opposite a bottom side a front side generally opposite a back side, and a medial side generally opposite a lateral side;

a first reference arm having a patient-specific contact surface configured to conform to a first tibial surface, the first tibial surface being a first portion of a superior surface of the tibia;

a second reference arm having a patient-specific contact surface configured to conform to a second tibial surface, the second tibial surface being a second portion of the superior surface of the tibia,

wherein the back side includes a patient-specific contact surface configured to conform to a third tibial surface, the third tibial surface being a portion of an anterior surface of the tibia,

wherein the patient-specific contact surface of the back side has a medial-most edge and a lateral-most edge;

wherein the tibial guide housing defines a void in at least a portion of the top side, the void sized and positioned such that when the tibial guide housing is positioned on the tibia and the patient-specific contact surfaces of each of the first reference arm, the second reference arm, and the back side are in conforming engagement with the first, second, and third tibial surfaces, respectively, a surgeon is able to view a portion of a peripheral edge of the anterior surface of the tibia, the portion of the peripheral edge of the anterior surface of the tibia having a medial-lateral position disposed between the medial-most edge and the lateral-most edge of the patient-specific surface of the back side; and

wherein the tibial guide housing defines a tibial-guide-box opening in at least a portion of the front side, the tibial-guide-box opening sized and shaped for the insertion of a tibial guide box at least partially into the tibial guide housing and for releasable securement of the tibial guide box to the tibial guide housing,

wherein when the tibial guide box is releasable secured within the tibial guide housing and the tibial guide housing is positioned on the tibia and the patient-specific contact surfaces of each of the first reference arm, the second reference arm, and the back side are in conforming engagement with the first, second, and third tibial surfaces, respectively, a guide aperture of the tibial guide box will guide a cutting tool inserted through the guide aperture along a cutting plane having a predetermined cut depth and angle in the tibia such that the tibial implant may be placed onto the cut tibia at the predetermined cut depth and angle.

2. The system of claim 1 , wherein the void comprises a viewing window configured to permit viewing of the portion of the peripheral edge of the anterior surface of the tibia from the top side of the tibial guide housing during positioning of the tibial guide housing on the tibia.

3. The system of claim 1 , including at least two tibial cutting guide boxes, wherein each of the at least two tibial cutting guide boxes has a different cut depth.

4. The system of claim 3 , wherein each of the at least two tibial cutting guide boxes are configured for releasable securement within the tibial guide housing.

5. The system of claim 1 , wherein the patient-specific contact surface of each reference arm is configured to engage an articular surface of the tibia.

6. The system of claim 1 , wherein the patient-specific contact surface of each reference arm is configured to engage a subchondral bone surface.

7. The system of claim 1 , wherein the top side includes a patient-specific alignment indicator configured to provide visual assistance for alignment of the tibial guide housing with respect to the tibia.

8. The system of claim 7 , wherein the alignment indicator comprises one or more channels formed in the top surface of the tibial guide housing.

9. The system of claim 7 , wherein the alignment indicator is positioned and shaped based, at least in part, on patient-specific information to substantially match a portion of a perimeter of the tibia when the tibial guide housing is positioned on the tibia in a predetermined alignment.

10. The system of claim 1 , further comprising an alignment leg, the alignment leg configured for attachment to a tibial alignment rod.

11. The system of claim 1 , wherein the tibial guide housing further comprises a third reference arm having a patient-specific contact surface configured to conform to a fourth tibial surface.

12. The system of claim 1 , wherein the tibial implant comprises a bone-facing surface that substantially negatively-matches a resected surface of the tibia formed by cutting the tibia at the predetermined cut depth and angle.

13. The system of claim 12 , wherein a perimeter of the tibial implant substantially positively-matches a perimeter of the resected surface of the tibia of the patient.

14. The system of claim 1 , wherein the tibial implant substantially positively-matches a perimeter of the resected surface of the tibia of the patient.

15. A method of treating a tibia of a knee joint of a patient, the method comprising:

providing a tibial guide housing, the tibial guide housing including:

a top side generally opposite a bottom side a front side generally opposite a back side, and a medial side generally opposite a lateral side;

a first reference arm having a patient-specific contact surface configured to conform to a first tibial surface, the first tibial surface being a first portion of a superior surface of the tibia;

a second reference arm having a patient-specific contact surface configured to conform to a second tibial surface, the second tibial surface being a second portion of the superior surface of the tibia,

wherein the back side includes a patient-specific contact surface configured to conform to a third tibial surface, the third tibial surface being a portion of an anterior surface of the tibia,

wherein the patient-specific contact surface of the back side has a medial-most edge and a lateral-most edge;

wherein the tibial guide housing defines a void in at least a portion of the top side, the void sized and positioned such that when the tibial guide housing is positioned on the tibia and the patient-specific contact surfaces of each of the first reference arm, the second reference arm, and the back side are in conforming engagement with the first, second, and third tibial surfaces, respectively, a surgeon is able to view a portion of a peripheral edge of the anterior surface of the tibia, the portion of the peripheral edge of the anterior surface of the tibia having a medial-lateral position disposed between the medial-most edge and the lateral-most edge of the patient-specific surface of the back side;

providing a first tibial cutting guide box, the first tibial cutting guide box including:

a guide aperture configured to accommodate a surgical cutting tool and guide the cutting tool along a cutting plane having a predetermined cut depth and angle; and

at least one pin hole configured to accommodate a pin passing into the tibia;

releasably securing the first tibial cutting guide box within an opening of the tibial guide housing;

positioning the tibial guide housing on the tibia such that each of the patient-specific contact surfaces of the tibial guide housing achieves a conforming fit with the tibia;

inserting a cutting device through the guide aperture and cutting a portion of the tibia along the cutting plane to create a cut tibial surface;

providing a tibial implant; and

placing the tibial implant on at least a portion of the cut tibial surface at the predetermined cut depth and angle.

16. The method of claim 15 , further comprising removing the first tibial cutting guide box from the tibial guide housing.

17. The method of claim 15 , further comprising selecting the first tibial cutting guide box from a plurality of tibial cutting guide boxes, each including a guide aperture having a different predetermined cut depth.

18. The method of claim 15 , further comprising:

positioning a trial prosthesis component on a cut surface of the tibia; and

checking a state of the knee joint, wherein the state of the knee joint is selected from the group consisting of ligament stability of the knee joint, range of motion of the knee joint, alignment of the knee joint, and combinations thereof.

19. The method of claim 18 , further comprising:

selecting a second tibial cutting guide box from a plurality of tibial cutting guide boxes, each including a guide aperture having a different predetermined cut depth, based, at least in part, on the checking a state of the knee joint; and

releasably securing the second tibial cutting guide box within the opening of the tibial guide housing.

Assignments (2)
SECURITY INTEREST Recorded Jun 7, 2024
From: RESTOR3D, INC.; CONFORMIS, INC.; IMATX, INC.
To: TRINITY CAPITAL INC., AS ADMINISTRATIVE AGENT
Reel/Frame 067679/0713 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 14, 2023
From: CHAO, NAM T.
To: CONFORMIS, INC.
Reel/Frame 064577/0041 →
Continuity (6)
Continuation 17222530 · Apr 5, 2021
Continuation 16671571 · Nov 1, 2019
Continuation 15330828 · Nov 7, 2016
Continuation 13865958 · Apr 18, 2013
Provisional Application 61635270 · Apr 18, 2012
Related Publication 20230346391A1 · Nov 2, 2023
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